The operation of canning equipment (such as punching machines, edge rolling machines, welding machines, painting lines, etc.) must strictly follow safety regulations and operating procedures, ensuring the personal safety of operators and avoiding equipment damage and product quality issues. The following provides a detailed explanation of operational precautions from six core dimensions: safety protection, equipment inspection, operating standards, exception handling, occupational health, and equipment maintenance:1. Safety protection: eliminate the risk of personal injurySafety protection is the primary prerequisite for operating canning equipment, which requires "pre job inspection, on-the-job compliance, and no violations throughout the entire process":Wear compliant protective equipmentFull protective equipment must be worn as required, and wearing clothing that may cause danger is prohibitedMandatory wearing: safety helmet (to prevent falling objects or equipment components from falling from high altitude), anti smashing safety shoes (to avoid metal waste/parts from injuring feet), protective gloves (anti slip+anti metal burrs and scratches, high temperature/chemical resistant gloves are required for welding/painting positions), goggles (to prevent metal debris splashing for punching/cutting positions).Prohibited from wearing: loose clothing (such as oversized cuffs, aprons), necklaces/bracelets/rings (easily tangled by equipment transmission components), and those with long hair should tuck their hair into a safety helmet (to avoid getting caught up in gears/belts).Confirm that the safety device is effectiveBefore starting up, it is necessary to check the safety protection devices of the equipment to ensure that there is no damage or failure:Punching/Pressure Equipment: Check the dual hand start button (both hands need to be pressed simultaneously to start, to prevent one hand misoperation), photoelectric protection device (the equipment will stop immediately when blocked), and emergency stop button (red, prominently located and sensitive to pressing).Curling/welding equipment: Check the protective fence (to prevent limbs from entering rotating parts) and spark protection cover (to prevent sparks from splashing and scalding during welding).It is strictly prohibited to dismantle or shield safety devices without authorization (such as using tape to stick photoelectric sensors). If a device malfunction is found, immediately stop the machine and report it for repair.Comply with the 'restricted area' rulesWhen the equipment is running, it is forbidden to insert hands, arms, or tools into dangerous areas such as the mold cavity, transmission gap, curling wheel, conveyor belt clamp, etc. (even if the equipment is running at low speed, it may trigger the action instantly).Non operators are prohibited from entering the equipment operation area. If multiple people are required to cooperate (such as cutting and feeding), clear division of labor and the use of "gestures/passwords" to confirm should be made to avoid misoperation.2. Equipment inspection: Ensure normal status before startupCan making equipment is mostly operated with high precision and high load. A comprehensive inspection before startup can avoid equipment damage or accidents caused by "faulty operation":Basic status checkAppearance: Check whether the equipment casing and protective cover are intact, without deformation or cracks; Are the anchor bolts of the equipment tightened to prevent vibration and displacement during operation.Power/Air/Hydraulic: Confirm that the power supply voltage is stable (in accordance with the rated voltage of the equipment, such as 380V industrial electricity), the wires are not damaged, and the grounding is reliable; The gas source pressure is normal (such as 0.6-0.8MPa), and there is no leakage in the trachea; The hydraulic system oil level is between the upper and lower limits, with no oil leakage or high oil temperature (generally ≤ 60 ℃).Core component inspectionFocus on inspecting key components based on equipment type:Punching/stretching machine: It is necessary to check whether the mold is installed firmly and the gap is uniform (without misalignment); Whether the slider runs smoothly without any jamming or abnormal noise; Is the clutch sensitive to avoid slipping or sticking.Edge rolling machine: Focus on checking the degree of wear of the edge rolling wheel (without serious scratches/deformation). If the wear is excessive, it can easily lead to uneven edge rolling of the can body; At the same time, confirm whether the pressure of the roller is appropriate (too loose may cause loose edges, while too tight may cause the roller to break or damage the can body).Welding machine (such as seam welding): Check whether the electrode head is clean (without oxide accumulation, which can affect the conductivity of the welding and cause virtual connection of the solder joint); Check if the welding current and speed parameters match the material of the can body (for example, tinplate requires lower current, aluminum requires higher current, and if the parameters do not match, welding penetration or leakage may occur).Coating/drying line: First, test spray to confirm if the nozzle is blocked (blockage can cause uneven coating thickness), and check if the nozzle atomization effect is uniform; Check if the temperature sensor of the drying oven is accurate (high temperature can easily cause coating coking, while low temperature can result in insufficient coating adhesion).Material and tooling inspectionConfirm that the specifications of the materials to be processed (such as tinplate coils and aluminum sheets) meet the equipment requirements (with no deviation in thickness and width. If the material is too thick, it may get stuck in the equipment, and if it is too thin, it may be deformed by pressure). At the same time, check the surface of the materials for oil stains and scratches (oil stains can affect the coating or welding effect, and scratches can reduce the strength of the can body).Check whether the fixtures and jigs (such as positioning blocks and suction cups) are intact, and confirm whether the positioning accuracy meets the standard (if the positioning is offset, it will cause dimensional deviation of the tank body and even cause equipment jamming).3. Operation standard: Follow the process to avoid misoperationStartup and trial operationBefore starting up, it is necessary to turn on the power in the order of "total power first, equipment power later", and wait for the equipment to complete self inspection (if the self inspection reports an error, the fault must be checked first, and forced startup is not allowed).After the first start-up or replacement of materials/molds, it is necessary to conduct an "empty machine trial run" (running for 1-2 cycles without materials) to observe whether the equipment runs smoothly and synchronously (such as whether the punch slide and feeding mechanism are coordinated smoothly), and confirm that there are no abnormalities before starting the feeding production.Production process operationWhen feeding, it is necessary to maintain a "uniform and orderly" speed to avoid adding too much material at once (to prevent material accumulation and equipment jamming); If manual auxiliary feeding is required, special tools (such as push rods) should be used. It is forbidden to directly touch the contact area between the material and the equipment transmission components with hands.Real time monitoring of product quality: The punching station needs to check whether there are cracks in the can body during stretching, the edge rolling station needs to randomly check the sealing of the edge rolling (which can be checked for leakage through "water injection test"), and the welding station needs to observe whether the welding points are continuous and free of leaks. If any quality problems are found, the machine should be stopped immediately for adjustment, and "production with problems" is not allowed.It is prohibited to perform "illegal operations" while the equipment is running, such as cleaning the internal waste of the equipment by hand (after shutting down and cutting off the power), arbitrarily adjusting equipment parameters (such as welding current and punch pressure, parameter adjustments need to be confirmed by the team leader and recorded), leaning against the equipment shell (to avoid body imbalance caused by vibration and getting caught up in the equipment).Shutdown processThe feeding should be stopped first, and after the remaining materials in the equipment are completely processed, the power should be cut off in the order of "equipment power first, then total power"; If it is a hydraulic or pneumatic equipment, the system pressure needs to be released first (such as closing the air source valve and hydraulic valve to avoid pressure residue causing unexpected equipment operation).After shutting down, it is necessary to clean the surrounding materials of the equipment (sort and stack finished products and waste materials, and place waste materials in a dedicated metal waste bin to avoid falling on the ground and causing slipping), wipe the surface of the equipment with oil stains (use a dedicated cleaning agent, do not rinse live parts directly with water).4. Exception handling: timely shutdown, scientific investigationImmediate shutdown situationWhen the following situations occur, press the "emergency stop button" immediately to cut off the power:The equipment experiences severe vibration and abnormal noise (such as gear collision sound, metal friction sound, which may be due to loose or damaged components);Material jamming (such as the tank body getting stuck in the mold or conveyor belt, forced operation can cause equipment overload and damage);Smoke and odor (such as burnt wires or overheated hydraulic oil, which may be due to electrical faults or hydraulic system abnormalities);Personal safety hazards occur (such as failure of protective devices, splashing of materials).Troubleshooting and repair reportingAfter shutdown, it is not allowed to disassemble the equipment (especially professional components such as electrical cabinets and hydraulic systems) without authorization. The fault phenomenon should be recorded first (such as "abnormal noise during operation of the curling machine, accompanied by heating of the curling wheel"), and the equipment maintenance personnel should be notified in a timely manner.During the maintenance process, it is necessary to hang a warning sign next to the equipment that reads' under maintenance, no turning on 'to prevent others from accidentally closing the switch; After the maintenance is completed, it is necessary to conduct an empty machine test run together with the maintenance personnel to confirm that the fault has been eliminated before resuming production.5. Occupational Health: Focus on Long term ProtectionDust and exhaust gas protectionStamping and cutting positions can generate metal dust, so it is necessary to ensure that the workshop ventilation system is normal (such as turning on exhaust fans or dust removal equipment), and if necessary, wear dust masks (N95 or above level) to avoid long-term inhalation of dust and respiratory diseases.The painting and welding positions will generate volatile organic compounds (VOCs) or welding fumes. Local exhaust devices (such as welding fume purifiers and painting fumes collection hoods) need to be installed next to the workstation, and operators need to wear gas masks (filter boxes for organic vapors).Noise and vibration protectionPunching machines and edge curling machines produce loud noise (usually exceeding 85dB) during operation, so it is necessary to wear noise proof earplugs or earmuffs to avoid hearing damage caused by long-term exposure; At the same time, regularly check the shock absorption devices of the equipment (such as the foot cushion) to reduce the impact of equipment vibration on the human body.Daily routine and protective habitsAvoid prolonged continuous operation (it is recommended to take a 10 minute break every 1-2 hours and move your limbs) to prevent fatigue from causing lack of concentration and leading to misoperation.Clean hands promptly after operation (especially after contact with paint or hydraulic oil, use industrial hand sanitizer to avoid chemical residue). If skin comes into contact with irritating liquids, rinse immediately with clean water for at least 15 minutes and seek medical examination.6. Equipment maintenance: Extend lifespan, reduce malfunctionsRoutine maintenanceAfter daily production, it is necessary to clean up the internal waste of the equipment (such as metal debris in the punch mold to avoid debris getting stuck in the mold), wipe the surface of the guide rail and transmission components, and add lubricating oil as required (such as guide rail oil and gear oil, do not mix oil products).Check the wear condition of vulnerable parts (such as punch die cutting edge, edge sealing ring, welding machine electrode head). If the wear exceeds the standard, it needs to be replaced in a timely manner (if the die cutting edge becomes dull, it will cause burrs on the can body, and the cutting edge needs to be replaced or re ground).Regular maintenanceCheck the electrical wiring terminals of the equipment weekly for looseness (looseness can cause poor contact and equipment tripping), and tighten the loose terminals; Check the air source filter and hydraulic oil filter. If there are too many impurities, replace the filter element (impurities can block the pipeline and affect the system pressure).Conduct a monthly "deep inspection" of key components of the equipment, such as the wear of the press clutch brake pads, the lubrication status of the rolling machine bearings, and whether the heating tubes of the drying furnace are aging (aging of the heating tubes can lead to uneven temperature), and keep maintenance records (indicating the maintenance date, component status, and replacement situation).Long term maintenanceConduct a comprehensive maintenance every quarter or six months (depending on the frequency of equipment use), such as replacing hydraulic oil, cleaning hydraulic oil tanks, checking the accuracy of equipment spindles and screws (if the accuracy decreases, calibration or repair is required); Dust the contactors and relays inside the electrical cabinet to avoid electrical faults caused by dust accumulation..EditContent ul{margin-left: -.4rem;padding-inline-start: .4rem;}.EditContent ul ul{margin-left:0;}
08-23Knowledge
The daily maintenance of canning machinery (such as punching machines, curling machines, welding machines, painting lines, etc.) is the key to ensuring stable operation of equipment, extending service life, and reducing downtime due to malfunctions. It is necessary to develop targeted maintenance plans based on the characteristics of different equipment types, focusing on the five core links of "cleaning, inspection, lubrication, adjustment, and recording". The specific contents are as follows:1. General basic maintenance: All canning machinery must performComprehensive cleaning: remove impurities and avoid component jammingEquipment surface cleaning: After daily production, wipe the equipment casing, operating table, and protective cover with a dry cloth to remove metal debris, oil stains, and dust from the surface (if the oil stains are thick, special industrial cleaning agents can be used, and direct flushing of electrical components or hydraulic systems with water is prohibited); Focus on cleaning the equipment observation window and instrument display screen to ensure clear readings.Internal waste cleaning: After shutting down and cutting off the power, clean the waste in the key areas inside the equipment - the punching machine needs to clean the metal debris in the mold cavity and feeding channel (compressed air can be used to blow it clean to avoid the debris getting stuck in the mold or scratching the material); The curling machine needs to clean the residual metal shavings in the gap between the curling wheels (the accumulation of debris can lead to a decrease in curling accuracy); The conveyor belt needs to be wiped off the surface of the rollers to remove any adhered material residue (to prevent the conveyor belt from deviating).Cleaning of surrounding environment: Sort out finished products and waste materials around the equipment, put metal waste into a dedicated recycling bin, and avoid waste accumulation blocking the equipment's heat dissipation port or affecting the operating space; Check for oil and gas leaks on the ground below the equipment, promptly clean and investigate the source.Basic status check: Confirm that the equipment has no obvious abnormalitiesSafety device inspection: Before starting up daily, confirm that the emergency stop button (red, immediately shuts off the device when pressed) is sensitive and reset normally; The photoelectric protection device of the punch press (the slider stops immediately after being blocked) is unobstructed and the indicator light is normal; The protective fence of the curling machine and welding machine should be free of deformation and firmly fixed, and it is forbidden to have the situation of "the protective fence is missing and the machine is still turned on".Power/air/hydraulic system inspection: Check that the power supply circuit is not damaged and the wiring terminals are not loose (especially at the main switch of the equipment, looseness can easily lead to poor contact and equipment tripping); The reading of the gas source pressure gauge is between 0.6-0.8MPa (in accordance with the standard air pressure for canning equipment), and there is no aging or leakage in the air pipe (can be tested by applying soapy water, if bubbling, the air pipe needs to be replaced); The hydraulic system oil level is between the upper and lower limit marks of the oil tank, with no oil leakage (check the oil pipe joints and cylinder seals), and the oil temperature does not exceed 60 ℃ (if the oil temperature is too high, check whether the cooling system is normal).Appearance and fastening inspection: Check that the equipment foundation bolts and component connection bolts are not loose (especially high-speed moving parts such as punch press sliders and edge rolling machine pressure wheels, which can cause severe vibration of the equipment if loose); The equipment casing and protective cover should be free of deformation or cracks. If there is any damage, it should be promptly reported for repair to avoid component detachment during operation.2. Specialized maintenance by equipment type: precise maintenance for core components（1） Punching/Stretching Machine: Focus on maintaining molds and transmission components1. Mold maintenanceCleaning and inspection: Clean the metal debris and oil stains on the inner wall of the mold cavity daily (can be wiped with a soft bristled brush, do not use hard tools to scrape, to avoid damaging the surface of the mold); Check if the cutting edge of the mold is sharp (if the cutting edge becomes dull, it will cause burrs and stretching cracks on the can body, and it needs to be ground or replaced in a timely manner); Check that the mold positioning pin is not loose or deformed (offset of the positioning pin can cause dimensional deviation of the can body and needs to be recalibrated).Lubrication: Apply specialized mold lubricant to the guide column and guide sleeve of the mold daily (do not use ordinary engine oil, as the lubricant has stronger adhesion and can reduce mold wear) to ensure that there is no jamming when the slider moves up and down; If the mold is not used for a long time (such as changing the shape), it is necessary to apply anti rust oil on the surface and wrap it with a moisture-proof film for storage.2. Maintenance of Transmission and Execution ComponentsSliding block and clutch: Check that the sliding block's running track is free of debris and well lubricated (the track surface needs to maintain a thin oil film and no dry wear marks); Test the sensitivity of the clutch opening and closing (the slider can start quickly after stepping on the pedal, and stop immediately after releasing it, without any "slip" or "delay" phenomenon). If the clutch is stuck, clean the dust inside the clutch and replenish the clutch specific lubricating oil.Feeding mechanism: Check the surface of the feeding roller for wear and deformation (wear can cause feeding deviation and inaccurate positioning of the tank body); Clean the impurities in the feeding channel and confirm that the tension of the feeding belt is moderate (too loose can cause slipping, too tight can cause breakage, which can be adjusted by adjusting the tension of the pulley).（2） Edge rolling machine: Focus on edge rolling wheel and pressure wheel maintenance1. Maintenance of curling wheel and pressure wheelCleaning and Wear Inspection: Wipe the surface of the edge roller and pressure roller with a soft cloth daily to remove any remaining metal shavings (accumulation of debris can cause uneven edges); Check that there are no serious scratches or dents on the wheel surface (if the wear is excessive, the wheel diameter needs to be measured, and if the deviation exceeds 0.5mm, it needs to be replaced to avoid "wrinkling" and "leaking" of the can body edges); Confirm that the wheel axle is not loose and there is no abnormal noise during rotation (if there is any abnormal noise, it may be due to bearing wear and needs to be disassembled for inspection).Pressure adjustment and lubrication: Before daily production, confirm that the pressure of the pressure roller meets the process requirements (1-2 tank bodies can be produced through trial production to check the sealing of the rolled edges. If the rolled edges are too loose, appropriate pressure should be applied, and if they are too tight, pressure should be reduced to prevent damage to the tank body); Add 2-3 drops of specialized bearing lubricating oil to the bearings of the edge roller and pressure roller (not excessive to avoid oil contamination of the tank body).2. Maintenance of positioning and guiding componentsCheck if the positioning block of the can body is secure (offset of the positioning block can cause deviation in the edge position, and it needs to be calibrated with a caliper before tightening); Clean up impurities in the guide track to ensure smooth transportation of the tank body without any jamming.（3） Welding machine (such as seam welding): Core maintenance electrode and welding system1. Electrode head maintenanceCleaning and repair: Use a dedicated wire brush to clean the oxide on the surface of the electrode head daily (oxides can affect conductivity, leading to virtual or missed solder joints); Check the degree of wear on the electrode head (if there are obvious dents or deformations on the electrode head, special tools should be used to repair or replace it, ensuring that the contact area between the electrode head and the can body meets the requirements, and avoiding welding through or welding points that are too small).Cooling inspection: Confirm that the electrode cooling water circuit is unobstructed (the electrode will generate high temperature during welding, and if the water circuit is blocked, the electrode is prone to overheating and damage). Check the water level in the cooling water tank daily, and add purified water if it is insufficient (prohibit using tap water to avoid scale blocking the pipeline). Clean the impurities in the water tank filter screen every week.2. Welding parameters and circuit inspectionCheck the welding current, voltage, and speed parameters (matching with the material of the tank body produced on the same day, such as welding current of about 80-120A for tinplate and 150-200A for aluminum. Parameter deviations need to be adjusted in a timely manner and cannot be operated based on experience); Check the welding circuit joints for looseness and oxidation (looseness can cause unstable current and affect welding quality).（4） Painting/Drying Line: Focus on maintaining the nozzle and drying system1. Maintenance of nozzle and coating systemCleaning the nozzle: After daily production, rinse the nozzle with a special solvent (matched with the coating, such as water for water-based coatings and a special diluent for oil-based coatings) to remove residual coating inside (to avoid coating solidification blocking the nozzle and causing uneven coating thickness during the next spraying); Disassemble the nozzle and check if the atomizing plate is worn or blocked. If it is damaged, it needs to be replaced.Paint pipeline inspection: Clean the impurities in the paint filter (filter blockage can cause poor paint delivery and affect spray pressure); Check the sealing of the paint tank to avoid moisture or contamination of the paint. Stir the paint before daily production to ensure uniform concentration (uneven concentration can cause color difference in the coating).2. Drying furnace maintenanceCleaning and temperature inspection: Clean the coating residue in the drying oven daily (residue accumulation can affect the temperature uniformity inside the oven, which can be gently scraped off with a special scraper to avoid damaging the furnace wall); Check whether the temperature sensor reading is accurate (a thermometer can be placed for comparison, if the deviation exceeds ± 5 ℃, the sensor needs to be calibrated), and ensure that the drying temperature meets the process requirements (such as the drying temperature of the outer coating of the tinplate is about 180-220 ℃, which is prone to coking if the temperature is too high, and insufficient adhesion if the temperature is too low).Ventilation inspection: Clean the impurities in the exhaust filter of the drying furnace (blockage of the filter can cause poor exhaust gas discharge and affect drying efficiency), and confirm that the exhaust fan is running normally without any abnormal noise.3. Lubrication management: executed according to "fixed point, fixed quality, and fixed quantity"Fixed point lubrication: Clearly identify the parts that need to be lubricated for each equipment (such as punch guide rails, rolling wheel bearings, welding machine chains), and post "lubrication point markings" on the equipment to avoid missing or adding incorrect parts.Fixed quality lubrication: Use lubricating oil/grease that matches the equipment (such as 32 # guide rail oil for punch press guide rails and lithium based grease for rolling wheel bearings. It is forbidden to mix different types of oil to avoid chemical reactions that may cause lubrication failure). The lubricating oil should be sealed and stored within its shelf life after opening to prevent impurities from entering.Quantitative lubrication: Control the lubrication amount according to the equipment manual requirements (such as adding 2-3 drops of lubricating oil to the bearing, applying an oil film thickness of about 0.1-0.2mm on the guide rail, not excessive, excessive will adsorb dust and form oil sludge, which will aggravate wear), and record the lubrication part, oil type, and dosage daily.4. Maintain records and handle exceptionsEstablish daily maintenance records: Fill out the "Can Making Equipment Maintenance Record Form" daily, detailing maintenance time, equipment shape, maintenance content (such as "punch mold lubrication, edge roller cleaning"), any abnormalities found (such as "slight wear of welding machine electrode head"), and processing results, in order to trace the equipment status and provide a basis for subsequent regular maintenance.Exception handling process: If minor abnormalities are found during maintenance (such as small-scale oil leakage or slight abnormal noise from components), they can be handled by themselves (such as replacing sealing rings or tightening bolts); If there is a serious malfunction (such as mold cracking, motor smoking, or severe oil leakage in the hydraulic system), the machine should be stopped immediately, and a "fault to be repaired" warning sign should be hung. Forced start-up is prohibited, and equipment maintenance personnel should be notified in a timely manner. The fault phenomenon should be explained in detail, and professional components (such as electrical cabinets and hydraulic valve groups) should not be disassembled without authorization.
08-23Knowledge
As a sealed packaging container made of metal (mainly aluminum or tinplate) as the substrate, cans have become an indispensable core category in the packaging industry since their popularity in the mid-20th century. With its multiple advantages of functionality, economy, and environmental friendliness, it deeply adapts to the needs of various fields such as food, beverages, and daily chemical products, and plays an irreplaceable role in product innovation, consumer experience upgrading, and sustainable development in the packaging industry. Its specific importance can be expanded to the following five dimensions:1. Adapt to diverse scenarios and support the development of core consumer categoriesThe structural characteristics and performance advantages of cans make them a "standard packaging" for many high-frequency consumer categories, directly supporting the large-scale production and market expansion of related industries, and serving as a key carrier for the packaging industry to meet consumer demand.Core packaging choices in the beverage industryFor carbonated beverages (such as cola, Sprite), energy drinks, beer, functional drinks, and other categories, the high sealing performance of the can (using double curling technology to completely isolate air, moisture, and light) can effectively lock in carbon dioxide, prevent flavor evaporation, and has strong pressure resistance (can withstand the internal pressure of carbonated beverages, avoiding can bursting), perfectly adapting to the storage and transportation needs of such products. Taking beer as an example, the light shielding properties of aluminum cans can prevent the "sunlight odor" caused by ultraviolet rays, and extend the shelf life by 3-6 months compared to glass bottles. At the same time, the lightweight characteristics (single can weight only 15-20g) reduce logistics costs and promote the "portable consumption" of beer (such as outdoor camping and sports scenes).The 'Safe Preservation Solution' for the Food IndustryThe high temperature sterilization resistance of cans (tin cans can withstand 121 ℃ high temperature sterilization, aluminum cans can withstand 100 ℃ pasteurization) makes them the core packaging for canned foods such as meat cans, fruit cans, and nut cans. By combining "sealing+sterilization", food can be stored for a long time without preservatives (with a shelf life of 1-2 years at room temperature). At the same time, metal materials have high chemical stability and will not undergo chemical reactions with food (such as acidic fruit cans not corroding the can wall), ensuring food safety. In addition, the "easy opening" (pull tab design) of the can solves the pain point of traditional glass bottle cans being difficult to open, enhances the consumer experience, and promotes the expansion of the ready to eat food market.Scenario based packaging supplement for niche categoriesIn addition to mainstream categories, cans are also suitable for niche fields such as daily chemical products (such as solid ointments, small care sets), pet food (small-sized meat cans), and pharmaceuticals (some cream like topical preparations). For example, mini cans (50-100ml) have become the preferred choice for portable skincare products and trial drinks due to their "small capacity and easy portability" characteristics, meeting the demand for "small and experiential consumption" in the consumer market and opening up a segmented market for the packaging industry.2. Promote the "efficiency revolution" in the packaging industry and adapt to large-scale productionThe standardization and automation characteristics of cans deeply meet the production needs of the modern packaging industry for "efficiency, continuity, and scale", and are an important support for the packaging industry to improve production capacity and reduce costs.Highly adaptable to automated production linesThe structure of cans is simple and standardized (with unified industry standards for diameter, height, and edge size), and can be seamlessly integrated with canning equipment, filling equipment, and labeling equipment - to metal coil to forming (punching and stretching, edge rolling), filling, sealing, and labeling, the entire production line can achieve fully automated operation (with a production capacity of 600-1200 cans per minute), far higher than the production efficiency of glass bottles (300-500 bottles per minute) and plastic bottles (400-800 bottles per minute). This efficiency directly supports the "mass production" of beverage and food enterprises (such as large beverage factories with a daily production capacity of millions of cans), promoting the upgrading of the packaging industry to "manual/semi automated" to "fully automated".Reduce full chain costs and enhance industry economyProduction end: The raw materials for cans (aluminum coils, tinplate coils) can be purchased in bulk, and the can making process is mature with a low scrap rate (only 2% -3%). The unit production cost is lower than that of glass bottles of the same specifications (glass bottle production requires melting glass, which consumes high energy and has a scrap rate of 5% -8%).Logistics end: Aluminum cans are lightweight (with the same capacity, aluminum cans weigh only 1/10 of glass bottles) and can be stacked tightly (without the risk of fragility and the need for additional cushioning packaging), reducing logistics transportation costs by 40% -60% compared to glass bottles; Although tinplate cans are slightly heavier, they have strong compressive strength and higher storage stacking height, which can improve warehouse utilization.Consumer end: The "disposable" feature of cans (no need for recycling and cleaning) reduces the operating costs of retail terminals (such as convenience stores not requiring glass bottle recycling equipment). At the same time, the pull ring design reduces the dependence on can opening tools, improves consumer convenience, indirectly promotes product sales growth, and forms a positive cycle of "packaging consumption".3. Leading the "sustainable development" of the packaging industry and aligning with environmental trendsAgainst the backdrop of the global "dual carbon" goal and the upgrading of environmental consumption concepts, the high recyclability and low environmental impact of cans have become an important benchmark for the packaging industry to practice sustainable development, promoting the industry's transformation to "disposable packaging" to "circular packaging".The "high recovery rate and recycling value" of metal materialsThe core materials of aluminum and tin cans are metals that can be infinitely recycled, and the energy consumption for recycling is much lower than that of producing raw materialsAluminum: The global average recycling rate of aluminum cans is over 70% (with some countries such as the United States and Japan exceeding 90%). Recycling 1 ton of scrap aluminum can save 95% of the energy consumption in primary aluminum production (primary aluminum production requires electrolytic aluminum, which consumes a lot of energy; recycled aluminum only needs to be melted, which greatly reduces energy consumption), while reducing carbon dioxide emissions by over 90%.Tinplate (tin plated steel plate): The recovery rate is over 85%, and it can be re rolled into steel plate after recycling. The metal properties are almost not lost during the recycling process, and the tin plating layer can be recovered synchronously to avoid heavy metal pollution.This "high recycling, low energy consumption" characteristic makes it a shape of "circular economy" in the packaging industry. Compared with plastic bottles (with a global recycling rate of only about 10% and reduced performance of recycled plastics, mostly "downgraded recycling") and glass bottles (which require repeated cleaning and high energy and water consumption for recycling), it has significant environmental advantages.Promote 'reduced design' in the packaging industryWith the upgrading of technology, the trend of "reduction" of aluminum cans is evident: in the past 20 years, the thickness of aluminum cans has been reduced to 0.3mm to below 0.2mm, and the weight of a single can has been reduced by about 30% (such as 330ml aluminum cans to 25g to 17g). The thickness of the can body of tin cans has also been reduced to 0.25mm to 0.18mm, achieving "raw material reduction" while ensuring strength, reducing resource consumption and waste generation. This reduction design provides the packaging industry with a development direction of "lightweight and low consumption", which is in line with the global policy requirements of "low-carbon packaging" (such as the weight restrictions on packaging in the EU's "Packaging and Packaging Waste Directive").4. Optimize consumer experience and drive "user oriented innovation" in the packaging industryThe design innovation of soda cans always revolves around "consumer demand", upgrading to functionality to appearance, not only enhancing user experience, but also promoting the packaging industry's transformation to "single protection function" to "function+experience+marketing" with diverse values.Functional Innovation: Addressing Consumer Pain PointsEasy to open design: In the early days, can openers were needed for cans. After the introduction of the "pull tab can" in 1963, the problem of "difficult to open the can" was completely solved; Nowadays, some cans use "safety pull rings" (the pull rings do not fall off after opening, avoiding accidental ingestion or environmental pollution) and "press to open" (suitable for children and the elderly), further optimizing the convenience of use.Portability and sealing upgrade: For outdoor scenes, we have launched the "easy to pull can with straw hole" (which can be inserted into the straw without opening the pull tab to avoid liquid splashing); In response to multiple drinking needs, we have developed a "reusable sealed can" (with a pull ring that can rotate and close after opening to maintain sealing and solve the problem of "easy contamination" of traditional cans after opening).Appearance Innovation: Empowering Brand MarketingThe metal surface of the can can can be printed using various printing techniques such as offset printing, screen printing, hot stamping, and relief. It has bright colors and strong adhesion, and can accurately present brand logos, patterns, and marketing information, becoming a "visual carrier" for communication between brands and consumers. For example, holiday limited edition cans (such as Spring Festival and World Cup themes) and co branded cans (such as anime and film IP co branding) attract consumers to purchase and enhance product added value through their exterior design; Some brands have also launched "personalized customized cans" (such as printing consumer names and blessings) to meet the demand for "emotional consumption". This "packaging is marketing" shape is driving the packaging industry to shift to a "cost center" to a "value center".5. Stabilize the supply chain and ensure the "risk resistance capability" of the packaging industryThe supply of raw materials for cans is stable, the production process is mature, and it is compatible with the global supply chain system. In extreme environments such as epidemics and logistics disruptions, it can ensure the continuity of packaging supply and enhance the packaging industry's ability to resist risks.Stable supply of raw materialsAluminum and tinplate are both global commodities with mature supply chains (aluminum mainly comes to countries such as Australia and Guinea, while tinplate comes to China, Japan, Germany, etc.), and sufficient reserves, making it less likely for raw material shortages to occur due to supply disruptions in a single region; Compared to plastics (which rely heavily on oil and are greatly affected by fluctuations in international oil prices) and glass (which rely on quartz sand and are limited by geographical production), the stability of raw material supply is stronger.Adapt to global logistics and distributionThe pressure resistance and impact resistance of cans make them less likely to be damaged during long-distance transportation (such as sea and land transportation), and do not require complex cushioning packaging, making them suitable for global distribution (such as cross-border beverage brands' products being transported in bulk by containers to various parts of the world). During the epidemic, many food and beverage companies relied on canned packaging to ensure the normal supply of their products (such as canned food, which has become an important component of emergency supplies due to its long shelf life and easy transportation), reflecting its stabilizing role in the supply chain and enhancing the packaging industry's ability to respond to sudden risks..EditContent ul{margin-left: -.4rem;padding-inline-start: .4rem;}.EditContent ul ul{margin-left:0;}
08-23Knowledge
For enterprises such as beverages, food, and daily chemical products that rely on can packaging for a long time, having their own can making machines (rather than outsourcing finished cans) is an important strategic choice to optimize the supply chain, reduce costs, and enhance competitiveness. Its advantages run through the five core links of "production, cost, supply chain, product innovation, and quality control", which can be elaborated to the following dimensions:1. Significantly reduce packaging costs and enhance corporate profit marginsPackaging cost is one of the core cost items for fast-moving consumer goods enterprises (usually accounting for 15% -25% of the total product cost). Self owned can making machines can avoid multiple premiums for imported finished cans through "source production", achieving deep cost optimization.Eliminate the "intermediate link premium" of finished cansWhen purchasing finished cans to outside, the enterprise needs to bear the "production profit, logistics cost, and channel markup" of the canning factory - the canning factory will add 15% -20% profit on top of the basic cost to cover its own equipment depreciation, labor, and raw material procurement costs; At the same time, during the transportation of finished cans to the canning factory to the enterprise, storage, loading and unloading, and long-distance transportation costs need to be paid (especially for packaging such as aluminum cans and tin cans that require moisture and pressure resistance, logistics costs are 8% -12% higher than ordinary goods). After setting up their own canning machine, enterprises can directly produce cans using the "raw material procurement (aluminum coil, tinplate coil)+independent production" , without paying a premium for intermediate links. The cost of a single can can can be reduced by 10% -25% (taking 330ml aluminum cans as an example, the unit price of external procurement is about 0.3-0.4 yuan, and the cost of self owned canning can be reduced to 0.2-0.3 yuan. When the annual output is 100 million cans, the annual cost savings can reach 10-20 million yuan).More bargaining power in raw material procurement, reducing volatility riskWhen purchasing finished cans to outside, enterprises need to passively accept the "raw material price increase transmission" to can manufacturers (such as when aluminum prices rise, can manufacturers will immediately increase the unit price of finished cans, and the bargaining space is small); After providing their own canning machine, enterprises can directly purchase bulk commodity raw materials such as aluminum coils and tinplate coils, and negotiate with suppliers based on the "large-scale procurement volume" to obtain lower procurement unit prices (5% -8% lower than the small-scale procurement cost of canning factories). At the same time, enterprises can avoid short-term fluctuations in raw material prices, stabilize canning costs, and avoid product profit compression caused by rising prices of finished cans through "long-term agreement price locking" and "seasonal stockpiling" (such as increasing inventory during low aluminum prices).2. Control the initiative of the supply chain and avoid the risk of external procurement dependenceUnder the finished product can external procurement mode, the production plan of enterprises is easily constrained by external factors such as the production capacity, logistics, and policies of the can making factory. Self owned can making machines can transform packaging supply to "passive dependence" to "active control", ensuring production continuity.Resolve the issues of "limited production capacity" and "order queuing"During peak seasons (such as summer beverage demand peaks and holiday food promotions), canning factories often operate at full capacity, which can lead to "insufficient production capacity and order queues" - some companies may have to wait 1-2 weeks to receive finished cans, resulting in their production lines being forced to reduce production or shut down due to "lack of packaging". After providing their own canning machine, enterprises can flexibly adjust their canning production capacity according to their own production plan (such as increasing canning shifts during peak seasons and reducing production capacity during off-season), without relying on the scheduling of canning factories, completely avoiding the passive situation of "having orders and raw materials, but unable to produce due to a shortage of cans".Avoiding logistics interruptions and geographical restrictions risksThe outsourced finished product tanks rely on cross regional logistics. In case of extreme weather (such as rainstorm and blizzard), epidemic control, road blockade, etc., the logistics is easy to be interrupted, leading to the supply interruption of packaging; In addition, if the canning factory is located in a remote area with a long transportation cycle (such as 3-5 days to a northern canning factory to a southern enterprise), a large amount of safety stock needs to be reserved (usually 15-30 days of usage), occupying funds and storage space. Self provided canning machine can achieve zero distance connection between canning and filling (canning workshop is adjacent to filling workshop), without long-distance transportation, with almost zero logistics risk. At the same time, safety stock can be compressed to 3-5 days, reducing capital occupation and warehousing costs.Reduce the communication cost and cycle of "specification changes"If the enterprise needs to adjust the specifications of the can (such as changing to 330ml to 500ml, or changing the thickness of the can body), in the external procurement mode, it needs to communicate with the can manufacturer again for design, mold opening, and trial production. The entire cycle takes 2-4 weeks, and the can manufacturer may charge additional mold opening fees for "small batch customization" (the single mold opening fee is about 50000-200000 yuan); After providing their own canning machine, enterprises can independently adjust molds and parameters, shorten the specification change cycle to 1-3 days, and do not need to pay additional mold opening fees (only need to replace mold accessories, cost about 10000-30000 yuan), flexibly responding to changes in market demand.3. Flexible adaptation to product innovation, enhancing market competitivenessIn the context of consumer upgrading, "differentiated packaging" is the key for enterprises to attract consumers and create product features. Self owned canning machines can give enterprises stronger packaging innovation autonomy and quickly respond to market trends.Support "small batch, personalized" canning, suitable for segmented marketsWhen purchasing finished cans to outside, can manufacturers usually require a "minimum order quantity" (such as a single order of no less than 100000 cans) to reduce costs, which makes it difficult for companies to launch small batch, trial sales products (such as new product trial packaging and regional limited edition) - if trial sales fail, a large number of remaining finished cans will become inventory backlog. After providing their own canning machine, enterprises can achieve "small batch flexible production" (such as single canning of 10-10000 cans), support personalized design (such as customized can body patterns, special can shapes, mini capacities), quickly test the segmented market (such as 200ml portable cans for camping scenes and cartoon pattern cans for children), and reduce innovation trial and error costs.Quickly respond to "hot marketing" and seize market opportunitiesWhen there are sudden hotspots in the market (such as sports events, festivals, social hotspots), companies need to quickly launch themed packaging products (such as World Cup themed cans, Spring Festival limited edition cans) to seize traffic. In the external procurement mode, it takes 2-3 weeks to design communication to delivery of finished tanks, which can easily miss the hot window period; The self provided canning machine can achieve rapid connection of the entire process of "design canning filling" (such as determining the design on the same day and completing canning and production the next day), which is 5-10 times faster than the external procurement mode, helping enterprises seize the opportunity in hot marketing and improve product sales and brand exposure.4. Strengthen quality control to ensure packaging and product safetyAs a packaging material that comes into direct contact with food and beverages, the quality of cans (such as sealing, material safety, and dimensional accuracy) directly affects product quality and consumer health. Self owned can making machines can achieve "full process quality control" and avoid quality hazards of imported finished cans.Full chain quality inspection to raw materials to finished productsWhen purchasing finished cans to outside, enterprises can only conduct sampling quality inspection at the time of receipt (such as checking whether the can body is deformed and whether the seal is intact), and cannot trace the quality of raw materials (such as whether the aluminum coil contains impurities, whether the tin plating layer of the tinplate meets the standards) and the can making process (such as whether the welding is leaking, whether the edge is uniform). If the can making factory uses inferior raw materials to reduce costs, it may lead to product contamination (such as the corrosion of the can wall releasing harmful substances) or seal failure (such as leakage and air leakage). After providing their own canning machine, enterprises can conduct quality inspections on the entire process of "raw material entry, canning process, and finished product delivery": the material composition (such as aluminum purity and tin layer thickness) is tested when the raw materials enter the site; Real time monitoring of mold accuracy (to avoid dimensional deviations of the can body), welding quality (using an air tightness tester to check welding points), and edge sealing (checking for leaks through water injection testing) during the can making process; The finished cans enter the filling process directly without the need for secondary transportation, reducing collision damage during handling and ensuring packaging quality to the source.Customized quality requirements for adapting to special productsFor products with special requirements (such as acidic beverages, high-temperature sterilized foods, carbonated beverages), cans need to have higher corrosion resistance, pressure resistance, and high temperature resistance. In the external procurement mode, canning factories may not be able to fully meet the customized requirements of enterprises (such as using ordinary aluminum coils instead of acid resistant aluminum coils to reduce costs); The self provided canning machine can select specialized raw materials based on product characteristics (such as acid resistant aluminum coils for acidic beverages and thick tin cans for high-temperature sterilized food), adjust canning processes (such as increasing the number of edge layers and optimizing welding parameters), ensure perfect matching between packaging and product characteristics, and avoid product deterioration and scrap caused by unsuitable packaging.5. Long term asset appreciation enhances the overall strength of enterprisesAs a high-value production equipment, canning machines can not only meet the needs of enterprises themselves, but also achieve asset appreciation through reasonable operation, enhance the risk resistance and industry competitiveness of enterprises.Long term reuse and depreciation advantages of equipment assetsThe service life of high-quality can making machines (such as fully automatic aluminum can production lines and tin can making machines) can reach 10-15 years, and the depreciation cost can be spread over long-term production - taking an aluminum can production line with an annual output of 100 million cans (equipment investment of about 50-80 million yuan) as an example, the average annual depreciation cost is about 3-8 million yuan. If finished cans are purchased externally, the average annual packaging cost may be as high as 30-40 million yuan. In the long run, the total cost of self owned can making machines is much lower than that of external procurement mode, and the equipment can be upgraded at any time according to the expansion of enterprise production capacity (such as adding modules to improve production capacity), adapting to the long-term development needs of enterprises.Excess production capacity can be used for external services to expand revenue channelsIf a company's canning production capacity exceeds its own demand (such as idle capacity during the off-season), it can provide canning services to the outside world (such as outsourcing the production of finished cans for surrounding small and medium-sized enterprises) to obtain additional income - the outsourcing unit price is usually 5% -10% lower than that of professional canning factories (because the company does not need to bear large-scale marketing and channel costs), with price advantages, while improving equipment utilization, reducing unit manufacturing costs, and achieving the dual value of "self utilize?+revenue generation".Enhance the integration capability of enterprise industrial chain and strengthen the industry discourse powerSelf owned canning machine means that the enterprise has completed the integration of the "packaging production product manufacturing" industry chain, reduced dependence on external suppliers, and has more initiative in industry competition (such as in the event of fluctuations in raw material prices, packaging shortages, etc., the enterprise can rely on its independent canning ability to stabilize production and even seize market share to competitors). At the same time, the ability to integrate the industrial chain will also enhance the discourse power of enterprises in upstream and downstream cooperation (for example, when negotiating with raw material suppliers, they can obtain more favorable prices through "long-term large-scale procurement", and when cooperating with distributors, they can strive for better cooperation conditions through "stable supply").
08-23Knowledge
The operation of canning equipment (such as punching machines, edge rolling machines, welding machines, painting lines, etc.) must strictly follow safety regulations and operating procedures, ensuring the personal safety of operators and avoiding equipment damage and product quality issues. The following provides a detailed explanation of operational precautions from six core dimensions: safety protection, equipment inspection, operating standards, exception handling, occupational health, and equipment maintenance:1. Safety protection: eliminate the risk of personal injurySafety protection is the primary prerequisite for operating canning equipment, which requires "pre job inspection, on-the-job compliance, and no violations throughout the entire process":Wear compliant protective equipmentFull protective equipment must be worn as required, and wearing clothing that may cause danger is prohibitedMandatory wearing: safety helmet (to prevent falling objects or equipment components from falling from high altitude), anti smashing safety shoes (to avoid metal waste/parts from injuring feet), protective gloves (anti slip+anti metal burrs and scratches, high temperature/chemical resistant gloves are required for welding/painting positions), goggles (to prevent metal debris splashing for punching/cutting positions).Prohibited from wearing: loose clothing (such as oversized cuffs, aprons), necklaces/bracelets/rings (easily tangled by equipment transmission components), and those with long hair should tuck their hair into a safety helmet (to avoid getting caught up in gears/belts).Confirm that the safety device is effectiveBefore starting up, it is necessary to check the safety protection devices of the equipment to ensure that there is no damage or failure:Punching/Pressure Equipment: Check the dual hand start button (both hands need to be pressed simultaneously to start, to prevent one hand misoperation), photoelectric protection device (the equipment will stop immediately when blocked), and emergency stop button (red, prominently located and sensitive to pressing).Curling/welding equipment: Check the protective fence (to prevent limbs from entering rotating parts) and spark protection cover (to prevent sparks from splashing and scalding during welding).It is strictly prohibited to dismantle or shield safety devices without authorization (such as using tape to stick photoelectric sensors). If a device malfunction is found, immediately stop the machine and report it for repair.Comply with the 'restricted area' rulesWhen the equipment is running, it is forbidden to insert hands, arms, or tools into dangerous areas such as the mold cavity, transmission gap, curling wheel, conveyor belt clamp, etc. (even if the equipment is running at low speed, it may trigger the action instantly).Non operators are prohibited from entering the equipment operation area. If multiple people are required to cooperate (such as cutting and feeding), clear division of labor and the use of "gestures/passwords" to confirm should be made to avoid misoperation.2. Equipment inspection: Ensure normal status before startupCan making equipment is mostly operated with high precision and high load. A comprehensive inspection before startup can avoid equipment damage or accidents caused by "faulty operation":Basic status checkAppearance: Check whether the equipment casing and protective cover are intact, without deformation or cracks; Are the anchor bolts of the equipment tightened to prevent vibration and displacement during operation.Power/Air/Hydraulic: Confirm that the power supply voltage is stable (in accordance with the rated voltage of the equipment, such as 380V industrial electricity), the wires are not damaged, and the grounding is reliable; The gas source pressure is normal (such as 0.6-0.8MPa), and there is no leakage in the trachea; The hydraulic system oil level is between the upper and lower limits, with no oil leakage or high oil temperature (generally ≤ 60 ℃).Core component inspectionFocus on inspecting key components based on equipment type:Punching/stretching machine: It is necessary to check whether the mold is installed firmly and the gap is uniform (without misalignment); Whether the slider runs smoothly without any jamming or abnormal noise; Is the clutch sensitive to avoid slipping or sticking.Edge rolling machine: Focus on checking the degree of wear of the edge rolling wheel (without serious scratches/deformation). If the wear is excessive, it can easily lead to uneven edge rolling of the can body; At the same time, confirm whether the pressure of the roller is appropriate (too loose may cause loose edges, while too tight may cause the roller to break or damage the can body).Welding machine (such as seam welding): Check whether the electrode head is clean (without oxide accumulation, which can affect the conductivity of the welding and cause virtual connection of the solder joint); Check if the welding current and speed parameters match the material of the can body (for example, tinplate requires lower current, aluminum requires higher current, and if the parameters do not match, welding penetration or leakage may occur).Coating/drying line: First, test spray to confirm if the nozzle is blocked (blockage can cause uneven coating thickness), and check if the nozzle atomization effect is uniform; Check if the temperature sensor of the drying oven is accurate (high temperature can easily cause coating coking, while low temperature can result in insufficient coating adhesion).Material and tooling inspectionConfirm that the specifications of the materials to be processed (such as tinplate coils and aluminum sheets) meet the equipment requirements (with no deviation in thickness and width. If the material is too thick, it may get stuck in the equipment, and if it is too thin, it may be deformed by pressure). At the same time, check the surface of the materials for oil stains and scratches (oil stains can affect the coating or welding effect, and scratches can reduce the strength of the can body).Check whether the fixtures and jigs (such as positioning blocks and suction cups) are intact, and confirm whether the positioning accuracy meets the standard (if the positioning is offset, it will cause dimensional deviation of the tank body and even cause equipment jamming).3. Operation standard: Follow the process to avoid misoperationStartup and trial operationBefore starting up, it is necessary to turn on the power in the order of "total power first, equipment power later", and wait for the equipment to complete self inspection (if the self inspection reports an error, the fault must be checked first, and forced startup is not allowed).After the first start-up or replacement of materials/molds, it is necessary to conduct an "empty machine trial run" (running for 1-2 cycles without materials) to observe whether the equipment runs smoothly and synchronously (such as whether the punch slide and feeding mechanism are coordinated smoothly), and confirm that there are no abnormalities before starting the feeding production.Production process operationWhen feeding, it is necessary to maintain a "uniform and orderly" speed to avoid adding too much material at once (to prevent material accumulation and equipment jamming); If manual auxiliary feeding is required, special tools (such as push rods) should be used. It is forbidden to directly touch the contact area between the material and the equipment transmission components with hands.Real time monitoring of product quality: The punching station needs to check whether there are cracks in the can body during stretching, the edge rolling station needs to randomly check the sealing of the edge rolling (which can be checked for leakage through "water injection test"), and the welding station needs to observe whether the welding points are continuous and free of leaks. If any quality problems are found, the machine should be stopped immediately for adjustment, and "production with problems" is not allowed.It is prohibited to perform "illegal operations" while the equipment is running, such as cleaning the internal waste of the equipment by hand (after shutting down and cutting off the power), arbitrarily adjusting equipment parameters (such as welding current and punch pressure, parameter adjustments need to be confirmed by the team leader and recorded), leaning against the equipment shell (to avoid body imbalance caused by vibration and getting caught up in the equipment).Shutdown processThe feeding should be stopped first, and after the remaining materials in the equipment are completely processed, the power should be cut off in the order of "equipment power first, then total power"; If it is a hydraulic or pneumatic equipment, the system pressure needs to be released first (such as closing the air source valve and hydraulic valve to avoid pressure residue causing unexpected equipment operation).After shutting down, it is necessary to clean the surrounding materials of the equipment (sort and stack finished products and waste materials, and place waste materials in a dedicated metal waste bin to avoid falling on the ground and causing slipping), wipe the surface of the equipment with oil stains (use a dedicated cleaning agent, do not rinse live parts directly with water).4. Exception handling: timely shutdown, scientific investigationImmediate shutdown situationWhen the following situations occur, press the "emergency stop button" immediately to cut off the power:The equipment experiences severe vibration and abnormal noise (such as gear collision sound, metal friction sound, which may be due to loose or damaged components);Material jamming (such as the tank body getting stuck in the mold or conveyor belt, forced operation can cause equipment overload and damage);Smoke and odor (such as burnt wires or overheated hydraulic oil, which may be due to electrical faults or hydraulic system abnormalities);Personal safety hazards occur (such as failure of protective devices, splashing of materials).Troubleshooting and repair reportingAfter shutdown, it is not allowed to disassemble the equipment (especially professional components such as electrical cabinets and hydraulic systems) without authorization. The fault phenomenon should be recorded first (such as "abnormal noise during operation of the curling machine, accompanied by heating of the curling wheel"), and the equipment maintenance personnel should be notified in a timely manner.During the maintenance process, it is necessary to hang a warning sign next to the equipment that reads' under maintenance, no turning on 'to prevent others from accidentally closing the switch; After the maintenance is completed, it is necessary to conduct an empty machine test run together with the maintenance personnel to confirm that the fault has been eliminated before resuming production.5. Occupational Health: Focus on Long term ProtectionDust and exhaust gas protectionStamping and cutting positions can generate metal dust, so it is necessary to ensure that the workshop ventilation system is normal (such as turning on exhaust fans or dust removal equipment), and if necessary, wear dust masks (N95 or above level) to avoid long-term inhalation of dust and respiratory diseases.The painting and welding positions will generate volatile organic compounds (VOCs) or welding fumes. Local exhaust devices (such as welding fume purifiers and painting fumes collection hoods) need to be installed next to the workstation, and operators need to wear gas masks (filter boxes for organic vapors).Noise and vibration protectionPunching machines and edge curling machines produce loud noise (usually exceeding 85dB) during operation, so it is necessary to wear noise proof earplugs or earmuffs to avoid hearing damage caused by long-term exposure; At the same time, regularly check the shock absorption devices of the equipment (such as the foot cushion) to reduce the impact of equipment vibration on the human body.Daily routine and protective habitsAvoid prolonged continuous operation (it is recommended to take a 10 minute break every 1-2 hours and move your limbs) to prevent fatigue from causing lack of concentration and leading to misoperation.Clean hands promptly after operation (especially after contact with paint or hydraulic oil, use industrial hand sanitizer to avoid chemical residue). If skin comes into contact with irritating liquids, rinse immediately with clean water for at least 15 minutes and seek medical examination.6. Equipment maintenance: Extend lifespan, reduce malfunctionsRoutine maintenanceAfter daily production, it is necessary to clean up the internal waste of the equipment (such as metal debris in the punch mold to avoid debris getting stuck in the mold), wipe the surface of the guide rail and transmission components, and add lubricating oil as required (such as guide rail oil and gear oil, do not mix oil products).Check the wear condition of vulnerable parts (such as punch die cutting edge, edge sealing ring, welding machine electrode head). If the wear exceeds the standard, it needs to be replaced in a timely manner (if the die cutting edge becomes dull, it will cause burrs on the can body, and the cutting edge needs to be replaced or re ground).Regular maintenanceCheck the electrical wiring terminals of the equipment weekly for looseness (looseness can cause poor contact and equipment tripping), and tighten the loose terminals; Check the air source filter and hydraulic oil filter. If there are too many impurities, replace the filter element (impurities can block the pipeline and affect the system pressure).Conduct a monthly "deep inspection" of key components of the equipment, such as the wear of the press clutch brake pads, the lubrication status of the rolling machine bearings, and whether the heating tubes of the drying furnace are aging (aging of the heating tubes can lead to uneven temperature), and keep maintenance records (indicating the maintenance date, component status, and replacement situation).Long term maintenanceConduct a comprehensive maintenance every quarter or six months (depending on the frequency of equipment use), such as replacing hydraulic oil, cleaning hydraulic oil tanks, checking the accuracy of equipment spindles and screws (if the accuracy decreases, calibration or repair is required); Dust the contactors and relays inside the electrical cabinet to avoid electrical faults caused by dust accumulation..EditContent ul{margin-left: -.4rem;padding-inline-start: .4rem;}.EditContent ul ul{margin-left:0;}
08-23Knowledge
The daily maintenance of canning machinery (such as punching machines, curling machines, welding machines, painting lines, etc.) is the key to ensuring stable operation of equipment, extending service life, and reducing downtime due to malfunctions. It is necessary to develop targeted maintenance plans based on the characteristics of different equipment types, focusing on the five core links of "cleaning, inspection, lubrication, adjustment, and recording". The specific contents are as follows:1. General basic maintenance: All canning machinery must performComprehensive cleaning: remove impurities and avoid component jammingEquipment surface cleaning: After daily production, wipe the equipment casing, operating table, and protective cover with a dry cloth to remove metal debris, oil stains, and dust from the surface (if the oil stains are thick, special industrial cleaning agents can be used, and direct flushing of electrical components or hydraulic systems with water is prohibited); Focus on cleaning the equipment observation window and instrument display screen to ensure clear readings.Internal waste cleaning: After shutting down and cutting off the power, clean the waste in the key areas inside the equipment - the punching machine needs to clean the metal debris in the mold cavity and feeding channel (compressed air can be used to blow it clean to avoid the debris getting stuck in the mold or scratching the material); The curling machine needs to clean the residual metal shavings in the gap between the curling wheels (the accumulation of debris can lead to a decrease in curling accuracy); The conveyor belt needs to be wiped off the surface of the rollers to remove any adhered material residue (to prevent the conveyor belt from deviating).Cleaning of surrounding environment: Sort out finished products and waste materials around the equipment, put metal waste into a dedicated recycling bin, and avoid waste accumulation blocking the equipment's heat dissipation port or affecting the operating space; Check for oil and gas leaks on the ground below the equipment, promptly clean and investigate the source.Basic status check: Confirm that the equipment has no obvious abnormalitiesSafety device inspection: Before starting up daily, confirm that the emergency stop button (red, immediately shuts off the device when pressed) is sensitive and reset normally; The photoelectric protection device of the punch press (the slider stops immediately after being blocked) is unobstructed and the indicator light is normal; The protective fence of the curling machine and welding machine should be free of deformation and firmly fixed, and it is forbidden to have the situation of "the protective fence is missing and the machine is still turned on".Power/air/hydraulic system inspection: Check that the power supply circuit is not damaged and the wiring terminals are not loose (especially at the main switch of the equipment, looseness can easily lead to poor contact and equipment tripping); The reading of the gas source pressure gauge is between 0.6-0.8MPa (in accordance with the standard air pressure for canning equipment), and there is no aging or leakage in the air pipe (can be tested by applying soapy water, if bubbling, the air pipe needs to be replaced); The hydraulic system oil level is between the upper and lower limit marks of the oil tank, with no oil leakage (check the oil pipe joints and cylinder seals), and the oil temperature does not exceed 60 ℃ (if the oil temperature is too high, check whether the cooling system is normal).Appearance and fastening inspection: Check that the equipment foundation bolts and component connection bolts are not loose (especially high-speed moving parts such as punch press sliders and edge rolling machine pressure wheels, which can cause severe vibration of the equipment if loose); The equipment casing and protective cover should be free of deformation or cracks. If there is any damage, it should be promptly reported for repair to avoid component detachment during operation.2. Specialized maintenance by equipment type: precise maintenance for core components（1） Punching/Stretching Machine: Focus on maintaining molds and transmission components1. Mold maintenanceCleaning and inspection: Clean the metal debris and oil stains on the inner wall of the mold cavity daily (can be wiped with a soft bristled brush, do not use hard tools to scrape, to avoid damaging the surface of the mold); Check if the cutting edge of the mold is sharp (if the cutting edge becomes dull, it will cause burrs and stretching cracks on the can body, and it needs to be ground or replaced in a timely manner); Check that the mold positioning pin is not loose or deformed (offset of the positioning pin can cause dimensional deviation of the can body and needs to be recalibrated).Lubrication: Apply specialized mold lubricant to the guide column and guide sleeve of the mold daily (do not use ordinary engine oil, as the lubricant has stronger adhesion and can reduce mold wear) to ensure that there is no jamming when the slider moves up and down; If the mold is not used for a long time (such as changing the shape), it is necessary to apply anti rust oil on the surface and wrap it with a moisture-proof film for storage.2. Maintenance of Transmission and Execution ComponentsSliding block and clutch: Check that the sliding block's running track is free of debris and well lubricated (the track surface needs to maintain a thin oil film and no dry wear marks); Test the sensitivity of the clutch opening and closing (the slider can start quickly after stepping on the pedal, and stop immediately after releasing it, without any "slip" or "delay" phenomenon). If the clutch is stuck, clean the dust inside the clutch and replenish the clutch specific lubricating oil.Feeding mechanism: Check the surface of the feeding roller for wear and deformation (wear can cause feeding deviation and inaccurate positioning of the tank body); Clean the impurities in the feeding channel and confirm that the tension of the feeding belt is moderate (too loose can cause slipping, too tight can cause breakage, which can be adjusted by adjusting the tension of the pulley).（2） Edge rolling machine: Focus on edge rolling wheel and pressure wheel maintenance1. Maintenance of curling wheel and pressure wheelCleaning and Wear Inspection: Wipe the surface of the edge roller and pressure roller with a soft cloth daily to remove any remaining metal shavings (accumulation of debris can cause uneven edges); Check that there are no serious scratches or dents on the wheel surface (if the wear is excessive, the wheel diameter needs to be measured, and if the deviation exceeds 0.5mm, it needs to be replaced to avoid "wrinkling" and "leaking" of the can body edges); Confirm that the wheel axle is not loose and there is no abnormal noise during rotation (if there is any abnormal noise, it may be due to bearing wear and needs to be disassembled for inspection).Pressure adjustment and lubrication: Before daily production, confirm that the pressure of the pressure roller meets the process requirements (1-2 tank bodies can be produced through trial production to check the sealing of the rolled edges. If the rolled edges are too loose, appropriate pressure should be applied, and if they are too tight, pressure should be reduced to prevent damage to the tank body); Add 2-3 drops of specialized bearing lubricating oil to the bearings of the edge roller and pressure roller (not excessive to avoid oil contamination of the tank body).2. Maintenance of positioning and guiding componentsCheck if the positioning block of the can body is secure (offset of the positioning block can cause deviation in the edge position, and it needs to be calibrated with a caliper before tightening); Clean up impurities in the guide track to ensure smooth transportation of the tank body without any jamming.（3） Welding machine (such as seam welding): Core maintenance electrode and welding system1. Electrode head maintenanceCleaning and repair: Use a dedicated wire brush to clean the oxide on the surface of the electrode head daily (oxides can affect conductivity, leading to virtual or missed solder joints); Check the degree of wear on the electrode head (if there are obvious dents or deformations on the electrode head, special tools should be used to repair or replace it, ensuring that the contact area between the electrode head and the can body meets the requirements, and avoiding welding through or welding points that are too small).Cooling inspection: Confirm that the electrode cooling water circuit is unobstructed (the electrode will generate high temperature during welding, and if the water circuit is blocked, the electrode is prone to overheating and damage). Check the water level in the cooling water tank daily, and add purified water if it is insufficient (prohibit using tap water to avoid scale blocking the pipeline). Clean the impurities in the water tank filter screen every week.2. Welding parameters and circuit inspectionCheck the welding current, voltage, and speed parameters (matching with the material of the tank body produced on the same day, such as welding current of about 80-120A for tinplate and 150-200A for aluminum. Parameter deviations need to be adjusted in a timely manner and cannot be operated based on experience); Check the welding circuit joints for looseness and oxidation (looseness can cause unstable current and affect welding quality).（4） Painting/Drying Line: Focus on maintaining the nozzle and drying system1. Maintenance of nozzle and coating systemCleaning the nozzle: After daily production, rinse the nozzle with a special solvent (matched with the coating, such as water for water-based coatings and a special diluent for oil-based coatings) to remove residual coating inside (to avoid coating solidification blocking the nozzle and causing uneven coating thickness during the next spraying); Disassemble the nozzle and check if the atomizing plate is worn or blocked. If it is damaged, it needs to be replaced.Paint pipeline inspection: Clean the impurities in the paint filter (filter blockage can cause poor paint delivery and affect spray pressure); Check the sealing of the paint tank to avoid moisture or contamination of the paint. Stir the paint before daily production to ensure uniform concentration (uneven concentration can cause color difference in the coating).2. Drying furnace maintenanceCleaning and temperature inspection: Clean the coating residue in the drying oven daily (residue accumulation can affect the temperature uniformity inside the oven, which can be gently scraped off with a special scraper to avoid damaging the furnace wall); Check whether the temperature sensor reading is accurate (a thermometer can be placed for comparison, if the deviation exceeds ± 5 ℃, the sensor needs to be calibrated), and ensure that the drying temperature meets the process requirements (such as the drying temperature of the outer coating of the tinplate is about 180-220 ℃, which is prone to coking if the temperature is too high, and insufficient adhesion if the temperature is too low).Ventilation inspection: Clean the impurities in the exhaust filter of the drying furnace (blockage of the filter can cause poor exhaust gas discharge and affect drying efficiency), and confirm that the exhaust fan is running normally without any abnormal noise.3. Lubrication management: executed according to "fixed point, fixed quality, and fixed quantity"Fixed point lubrication: Clearly identify the parts that need to be lubricated for each equipment (such as punch guide rails, rolling wheel bearings, welding machine chains), and post "lubrication point markings" on the equipment to avoid missing or adding incorrect parts.Fixed quality lubrication: Use lubricating oil/grease that matches the equipment (such as 32 # guide rail oil for punch press guide rails and lithium based grease for rolling wheel bearings. It is forbidden to mix different types of oil to avoid chemical reactions that may cause lubrication failure). The lubricating oil should be sealed and stored within its shelf life after opening to prevent impurities from entering.Quantitative lubrication: Control the lubrication amount according to the equipment manual requirements (such as adding 2-3 drops of lubricating oil to the bearing, applying an oil film thickness of about 0.1-0.2mm on the guide rail, not excessive, excessive will adsorb dust and form oil sludge, which will aggravate wear), and record the lubrication part, oil type, and dosage daily.4. Maintain records and handle exceptionsEstablish daily maintenance records: Fill out the "Can Making Equipment Maintenance Record Form" daily, detailing maintenance time, equipment shape, maintenance content (such as "punch mold lubrication, edge roller cleaning"), any abnormalities found (such as "slight wear of welding machine electrode head"), and processing results, in order to trace the equipment status and provide a basis for subsequent regular maintenance.Exception handling process: If minor abnormalities are found during maintenance (such as small-scale oil leakage or slight abnormal noise from components), they can be handled by themselves (such as replacing sealing rings or tightening bolts); If there is a serious malfunction (such as mold cracking, motor smoking, or severe oil leakage in the hydraulic system), the machine should be stopped immediately, and a "fault to be repaired" warning sign should be hung. Forced start-up is prohibited, and equipment maintenance personnel should be notified in a timely manner. The fault phenomenon should be explained in detail, and professional components (such as electrical cabinets and hydraulic valve groups) should not be disassembled without authorization.
08-23Knowledge
As a sealed packaging container made of metal (mainly aluminum or tinplate) as the substrate, cans have become an indispensable core category in the packaging industry since their popularity in the mid-20th century. With its multiple advantages of functionality, economy, and environmental friendliness, it deeply adapts to the needs of various fields such as food, beverages, and daily chemical products, and plays an irreplaceable role in product innovation, consumer experience upgrading, and sustainable development in the packaging industry. Its specific importance can be expanded to the following five dimensions:1. Adapt to diverse scenarios and support the development of core consumer categoriesThe structural characteristics and performance advantages of cans make them a "standard packaging" for many high-frequency consumer categories, directly supporting the large-scale production and market expansion of related industries, and serving as a key carrier for the packaging industry to meet consumer demand.Core packaging choices in the beverage industryFor carbonated beverages (such as cola, Sprite), energy drinks, beer, functional drinks, and other categories, the high sealing performance of the can (using double curling technology to completely isolate air, moisture, and light) can effectively lock in carbon dioxide, prevent flavor evaporation, and has strong pressure resistance (can withstand the internal pressure of carbonated beverages, avoiding can bursting), perfectly adapting to the storage and transportation needs of such products. Taking beer as an example, the light shielding properties of aluminum cans can prevent the "sunlight odor" caused by ultraviolet rays, and extend the shelf life by 3-6 months compared to glass bottles. At the same time, the lightweight characteristics (single can weight only 15-20g) reduce logistics costs and promote the "portable consumption" of beer (such as outdoor camping and sports scenes).The 'Safe Preservation Solution' for the Food IndustryThe high temperature sterilization resistance of cans (tin cans can withstand 121 ℃ high temperature sterilization, aluminum cans can withstand 100 ℃ pasteurization) makes them the core packaging for canned foods such as meat cans, fruit cans, and nut cans. By combining "sealing+sterilization", food can be stored for a long time without preservatives (with a shelf life of 1-2 years at room temperature). At the same time, metal materials have high chemical stability and will not undergo chemical reactions with food (such as acidic fruit cans not corroding the can wall), ensuring food safety. In addition, the "easy opening" (pull tab design) of the can solves the pain point of traditional glass bottle cans being difficult to open, enhances the consumer experience, and promotes the expansion of the ready to eat food market.Scenario based packaging supplement for niche categoriesIn addition to mainstream categories, cans are also suitable for niche fields such as daily chemical products (such as solid ointments, small care sets), pet food (small-sized meat cans), and pharmaceuticals (some cream like topical preparations). For example, mini cans (50-100ml) have become the preferred choice for portable skincare products and trial drinks due to their "small capacity and easy portability" characteristics, meeting the demand for "small and experiential consumption" in the consumer market and opening up a segmented market for the packaging industry.2. Promote the "efficiency revolution" in the packaging industry and adapt to large-scale productionThe standardization and automation characteristics of cans deeply meet the production needs of the modern packaging industry for "efficiency, continuity, and scale", and are an important support for the packaging industry to improve production capacity and reduce costs.Highly adaptable to automated production linesThe structure of cans is simple and standardized (with unified industry standards for diameter, height, and edge size), and can be seamlessly integrated with canning equipment, filling equipment, and labeling equipment - to metal coil to forming (punching and stretching, edge rolling), filling, sealing, and labeling, the entire production line can achieve fully automated operation (with a production capacity of 600-1200 cans per minute), far higher than the production efficiency of glass bottles (300-500 bottles per minute) and plastic bottles (400-800 bottles per minute). This efficiency directly supports the "mass production" of beverage and food enterprises (such as large beverage factories with a daily production capacity of millions of cans), promoting the upgrading of the packaging industry to "manual/semi automated" to "fully automated".Reduce full chain costs and enhance industry economyProduction end: The raw materials for cans (aluminum coils, tinplate coils) can be purchased in bulk, and the can making process is mature with a low scrap rate (only 2% -3%). The unit production cost is lower than that of glass bottles of the same specifications (glass bottle production requires melting glass, which consumes high energy and has a scrap rate of 5% -8%).Logistics end: Aluminum cans are lightweight (with the same capacity, aluminum cans weigh only 1/10 of glass bottles) and can be stacked tightly (without the risk of fragility and the need for additional cushioning packaging), reducing logistics transportation costs by 40% -60% compared to glass bottles; Although tinplate cans are slightly heavier, they have strong compressive strength and higher storage stacking height, which can improve warehouse utilization.Consumer end: The "disposable" feature of cans (no need for recycling and cleaning) reduces the operating costs of retail terminals (such as convenience stores not requiring glass bottle recycling equipment). At the same time, the pull ring design reduces the dependence on can opening tools, improves consumer convenience, indirectly promotes product sales growth, and forms a positive cycle of "packaging consumption".3. Leading the "sustainable development" of the packaging industry and aligning with environmental trendsAgainst the backdrop of the global "dual carbon" goal and the upgrading of environmental consumption concepts, the high recyclability and low environmental impact of cans have become an important benchmark for the packaging industry to practice sustainable development, promoting the industry's transformation to "disposable packaging" to "circular packaging".The "high recovery rate and recycling value" of metal materialsThe core materials of aluminum and tin cans are metals that can be infinitely recycled, and the energy consumption for recycling is much lower than that of producing raw materialsAluminum: The global average recycling rate of aluminum cans is over 70% (with some countries such as the United States and Japan exceeding 90%). Recycling 1 ton of scrap aluminum can save 95% of the energy consumption in primary aluminum production (primary aluminum production requires electrolytic aluminum, which consumes a lot of energy; recycled aluminum only needs to be melted, which greatly reduces energy consumption), while reducing carbon dioxide emissions by over 90%.Tinplate (tin plated steel plate): The recovery rate is over 85%, and it can be re rolled into steel plate after recycling. The metal properties are almost not lost during the recycling process, and the tin plating layer can be recovered synchronously to avoid heavy metal pollution.This "high recycling, low energy consumption" characteristic makes it a shape of "circular economy" in the packaging industry. Compared with plastic bottles (with a global recycling rate of only about 10% and reduced performance of recycled plastics, mostly "downgraded recycling") and glass bottles (which require repeated cleaning and high energy and water consumption for recycling), it has significant environmental advantages.Promote 'reduced design' in the packaging industryWith the upgrading of technology, the trend of "reduction" of aluminum cans is evident: in the past 20 years, the thickness of aluminum cans has been reduced to 0.3mm to below 0.2mm, and the weight of a single can has been reduced by about 30% (such as 330ml aluminum cans to 25g to 17g). The thickness of the can body of tin cans has also been reduced to 0.25mm to 0.18mm, achieving "raw material reduction" while ensuring strength, reducing resource consumption and waste generation. This reduction design provides the packaging industry with a development direction of "lightweight and low consumption", which is in line with the global policy requirements of "low-carbon packaging" (such as the weight restrictions on packaging in the EU's "Packaging and Packaging Waste Directive").4. Optimize consumer experience and drive "user oriented innovation" in the packaging industryThe design innovation of soda cans always revolves around "consumer demand", upgrading to functionality to appearance, not only enhancing user experience, but also promoting the packaging industry's transformation to "single protection function" to "function+experience+marketing" with diverse values.Functional Innovation: Addressing Consumer Pain PointsEasy to open design: In the early days, can openers were needed for cans. After the introduction of the "pull tab can" in 1963, the problem of "difficult to open the can" was completely solved; Nowadays, some cans use "safety pull rings" (the pull rings do not fall off after opening, avoiding accidental ingestion or environmental pollution) and "press to open" (suitable for children and the elderly), further optimizing the convenience of use.Portability and sealing upgrade: For outdoor scenes, we have launched the "easy to pull can with straw hole" (which can be inserted into the straw without opening the pull tab to avoid liquid splashing); In response to multiple drinking needs, we have developed a "reusable sealed can" (with a pull ring that can rotate and close after opening to maintain sealing and solve the problem of "easy contamination" of traditional cans after opening).Appearance Innovation: Empowering Brand MarketingThe metal surface of the can can can be printed using various printing techniques such as offset printing, screen printing, hot stamping, and relief. It has bright colors and strong adhesion, and can accurately present brand logos, patterns, and marketing information, becoming a "visual carrier" for communication between brands and consumers. For example, holiday limited edition cans (such as Spring Festival and World Cup themes) and co branded cans (such as anime and film IP co branding) attract consumers to purchase and enhance product added value through their exterior design; Some brands have also launched "personalized customized cans" (such as printing consumer names and blessings) to meet the demand for "emotional consumption". This "packaging is marketing" shape is driving the packaging industry to shift to a "cost center" to a "value center".5. Stabilize the supply chain and ensure the "risk resistance capability" of the packaging industryThe supply of raw materials for cans is stable, the production process is mature, and it is compatible with the global supply chain system. In extreme environments such as epidemics and logistics disruptions, it can ensure the continuity of packaging supply and enhance the packaging industry's ability to resist risks.Stable supply of raw materialsAluminum and tinplate are both global commodities with mature supply chains (aluminum mainly comes to countries such as Australia and Guinea, while tinplate comes to China, Japan, Germany, etc.), and sufficient reserves, making it less likely for raw material shortages to occur due to supply disruptions in a single region; Compared to plastics (which rely heavily on oil and are greatly affected by fluctuations in international oil prices) and glass (which rely on quartz sand and are limited by geographical production), the stability of raw material supply is stronger.Adapt to global logistics and distributionThe pressure resistance and impact resistance of cans make them less likely to be damaged during long-distance transportation (such as sea and land transportation), and do not require complex cushioning packaging, making them suitable for global distribution (such as cross-border beverage brands' products being transported in bulk by containers to various parts of the world). During the epidemic, many food and beverage companies relied on canned packaging to ensure the normal supply of their products (such as canned food, which has become an important component of emergency supplies due to its long shelf life and easy transportation), reflecting its stabilizing role in the supply chain and enhancing the packaging industry's ability to respond to sudden risks..EditContent ul{margin-left: -.4rem;padding-inline-start: .4rem;}.EditContent ul ul{margin-left:0;}
08-23Knowledge
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Copyright: Shantou Xinqing Cannery Machinery Co., Ltd. Support: 11400.cc 粵公網安備：44051102000566號 粵ICP備19094376號-1
