Pre-Start Preparation
Plastic thermoforming machines are fundamental equipment in secondary plastic forming processes. Their daily use and maintenance directly impact production continuity and equipment safety. Before starting, the following checks are essential:
- Carefully inspect processed materials to ensure they are clean and free of foreign matter and dirt.
- Ensure all machine components are clean and hygienic.
- Before each operation, check air compressors, vacuum pumps, fans, and other equipment for proper pressure and function.
- Check clamping devices, mold lifting mechanisms, safety doors, plungers, and other moving parts for flexible and reliable movement.
- Verify all lubrication system pipelines are unobstructed and lubrication points are dispensing oil properly. Apply specified amounts of lubricant to all lubrication components according to lubrication rules.
- Check electrical equipment for safety and reliability.
Startup Operation
- Start the heating system. Before starting, carefully verify that temperature control instrument settings for each section meet process requirements. After startup, check that heater current indication values are normal.
- Adjust heating time, pressure, speed, and other parameters according to process settings.
- When feeding material, ensure sheets are properly positioned. After clamping the frame, the sheet edges should be flat to prevent air leakage affecting quality.
- Carefully remove products while wearing gloves to avoid contact with heated products.
Regular Maintenance Schedule
- Cleaning: Regularly clean equipment exterior and interior, including removing accumulated plastic residues and lubricant dirt. Keeping equipment clean reduces failures and improves productivity.
- Lubrication: Regularly lubricate equipment lubrication points to ensure proper component operation. Lubricating oil and grease require periodic replacement to maintain lubrication effectiveness.
- Fastener Inspection: Regularly check all equipment fasteners to ensure they remain properly tightened, preventing loosening-related equipment failure.
- Electrical System Inspection: Regularly inspect electrical systems including cables, terminals, and switches to ensure secure connections and prevent electrical fault safety hazards.
- Transmission System Inspection: Regularly check transmission systems including belts, chains, and gear drives to ensure proper operation, promptly replacing severely worn transmission components.
- Heating System Inspection: Regularly inspect heating systems including heaters and temperature control instruments to ensure normal operation and prevent heating system failure production accidents.
- Safety Device Inspection: Regularly check safety devices including emergency stop switches, safety doors, and protective guards to ensure they are complete and effective for operator safety.
Safety Operating Procedures
- Thermoforming machines should be operated by dedicated trained personnel familiar with the equipment, operations, and related knowledge.
- Operators must wear protective equipment meeting safety standards, such as gloves and goggles.
- Equipment must be properly grounded to prevent electric shock.
- Check air compressors, vacuum pumps, and oil atomizers for oil deficiency before startup and during continuous operation each shift.
- During operation, continuously monitor air compressor sounds and check that pressure does not exceed rated values. Immediately cut power and water if abnormalities are detected.
- Drain wastewater from air filters according to ambient humidity levels.
- Before operation, check that protective covers are installed and heater temperature and pressure settings are within specified ranges.
- When connecting compressed air, all personnel must stand in safe areas to prevent equipment-related injuries.
- If equipment abnormalities occur, immediately stop for inspection and repair. Never operate equipment with known issues.
- Insert plunger safety pins whenever the plunger is not in use, during adjustments, maintenance, or shutdowns.
- After work completion, shut off brake power and disconnect air source. Cover work surfaces with clean cloth or plastic film to prevent dust accumulation.
- Do not arbitrarily adjust limit switches on the equipment.
- Power off when changing molds, worktables, and press frames. Exercise extra caution during first test runs after mold changes.
- Open the water tank bottom drain valve at least once weekly for drainage.
Environmental Protection
- Install waste gas treatment equipment such as gas purifiers or treatment systems to handle volatile organic compounds generated during processing.
- Establish wastewater treatment systems to ensure discharged water meets environmental requirements.
- Implement proper solid waste management for waste materials and discarded molds through classification, recycling, or safe disposal.
- Optimize process parameters and adopt energy-efficient equipment to reduce energy consumption and environmental emissions.
- Establish environmental monitoring systems to track air and water quality indicators around thermoforming machines.
