Common Safety Hazards and Prevention Measures in Injection Molding Production
The injection molding industry acts as an important supporting sector of manufacturing, widely applied in automobile, electronic, daily necessities and many other fields. Injection molding production relies on coordinated operation of injection molding machines, molds, heating systems and hydraulic systems, covering multiple risks such as high temperature, high pressure, mechanical movement and electrical operation. Workshop operators frequently conduct equipment operation, mold replacement and product picking. Safety accidents easily occur once improper operation, equipment disrepair and management omission take place. To standardize on-site operations and avoid safety risks, common safety hazards in injection molding production and corresponding preventive measures are systematically sorted out to fully guarantee orderly and safe workshop production.
1. Mechanical Injury Hazards and Preventive Measures
Mechanical injury ranks as the most frequent and highly destructive safety hazard in injection molding production. Procedures including mold opening, mold closing, ejection and injection of injection molding machines adopt high-speed automatic reciprocating motion, with high-risk operation zones at mold opening areas, tie bars and transmission structures. During daily production, some operators take risks to reach hands into molds to take sprues, clean molds and wipe mold surfaces for higher work efficiency, or conduct mold adjustment and maintenance when machines are not fully shut down and power disconnected. Meanwhile, protective devices such as safety doors, guardrails and emergency stop buttons of partial equipment are damaged, malfunctioning or artificially shielded and removed, leading to failure of equipment safety protection. In addition, shredders and conveying equipment lack protective baffles, and operators’ long hair and loose clothing are easily drawn into equipment, triggering extrusion, clamping and cutting injuries.
To prevent such accidents, equipment and personnel operation management must be strictly standardized. All injection molding machines must be fully equipped with safety protection devices, safety induction systems and emergency stop buttons must be inspected regularly, and shielding or removal of protective facilities is completely forbidden. Standardized operations are fully implemented to prohibit reaching hands into running molds. Mold cleaning and equipment maintenance must be carried out after machine shutdown and power cut-off with maintenance warning signs hung. Closed protective baffles are installed on auxiliary equipment including shredders and conveyor belts. Operators must bind clothes and wear work caps on duty to eliminate risky illegal operations.
2. High-Temperature Scald and Melt Material Burn Hazards and Preventive Measures
Injection molding production relies on high-temperature melting of plastics to complete forming operations. Barrels, heating coils, molds and nozzles work at temperatures ranging from 180℃ to 300℃ under long-term high-temperature operation, so risks of high-temperature scald and melt material burn run through the whole production process. Operators easily suffer skin scald when manually cleaning nozzle residual materials, overhaul heating equipment at close range and replace mold accessories without protection. Meanwhile, improperly adjusted production parameters, loose mold sealing and excessive injection pressure lead to overflow and splashing of high-temperature molten plastics, causing deep burns. In addition, aging and damaged hydraulic pipelines and high-temperature cooling water pipelines leak media and also easily trigger scald accidents.
All-round protective measures must be implemented targeting high-temperature operation risks. Operators must wear high-temperature resistant gloves, face shields and other labor protection articles when contacting high-temperature equipment and cleaning molten materials. Production parameters are strictly controlled during production to prohibit operation beyond temperature and pressure limits. Mold tightness is inspected regularly to avoid leakage and splashing of molten materials. Normalized inspection of heating systems, barrels, hydraulic pipelines and cooling pipelines is carried out with timely replacement of aging and damaged fittings to eliminate equipment leakage from the source and avoid risks of high-temperature injury.
3. Electrical, Fire and Explosion Hazards and Preventive Measures
Injection molding workshops feature dense equipment and complex electrical circuits, which easily breed electrical safety hazards after long-term continuous operation. Aging circuits, damaged insulation layers, loose wiring and equipment leakage frequently occur. In addition, illegal activities such as random wiring, overloaded machine operation and stacking sundries on sockets in workshops easily trigger short circuits, electric leakage and electric shock accidents. Meanwhile, plastic pellets, sprues and packaging materials all belong to flammable items. Accumulated plastic dust and scraps in workshops easily catch fire upon contact with electrical sparks and high-temperature heat sources. Flammable and volatile additives such as release agents and cleaning agents are placed close to heat sources with poor ventilation, leading to accumulation of volatile gas and potential fire or explosion accidents, causing massive safety losses.
Normalized equipment maintenance and on-site control are required to prevent electrical and fire risks. Professional electricians regularly inspect workshop electrical circuits, switches and grounding devices, replace aging damaged circuits, standardize power layout and prohibit random wiring. Power must be cut off after equipment shutdown. Flammable materials and chemical additives are stored in classified and partitioned areas far away from high-temperature equipment and electrical heat sources, maintaining smooth workshop ventilation. Sufficient fire extinguishers and fire hydrants are equipped with regular inspection and maintenance. Timely cleaning of workshop dust and sundries ensures unobstructed fire exits. Fire drills are held periodically to improve employees’ emergency disposal capabilities.
4. On-Site Management and Human Operation Hazards and Preventive Measures
Non-standardized on-site management and weak personnel safety awareness constitute invisible safety hazards in injection molding workshops. Leaked cooling water and dripping oil stains make workshop floors slippery, so operators easily slip and fall when transporting materials and walking. Random stacking of materials, finished products and waste blocks operation passages and fire exits, hindering rapid personnel evacuation during emergencies. Meanwhile, insufficient pre-job safety training for new employees leads to poor cognition of equipment operation specifications and risk points, easily triggering misoperation. Daily safety inspections are superficial with hidden dangers accumulated without rectification. Operators fail to wear labor protection articles as required, further increasing accident probability.
On-site management and personnel training must be comprehensively refined to solve such problems. Clean accumulated water and oil stains on workshop floors daily with anti-slip treatment implemented, and standardized stacking of various materials guarantees unobstructed passages. Establish complete pre-job training and normalized safety education mechanisms. New employees can only take up posts after passing assessments. Regular safety warning education is carried out to eliminate risky luck and illegal operations. Implement a daily safety inspection system and establish hidden danger rectification ledgers to realize closed-loop management of hidden danger investigation, rectification and re-inspection, and eliminate safety accidents from the management level.
Conclusion
In summary, safety hazards in injection molding production cover multiple dimensions including mechanical operation, high-temperature operation, electrical fire protection and on-site management, with strong concealment and high correlation of hidden dangers. Slight negligence easily triggers safety accidents. Safety production serves as the core guarantee for stable operation of injection molding workshops. Enterprises must adhere to the principle of safety first, prevention first and comprehensive treatment. On one hand, complete equipment protection and eliminate equipment hidden dangers; on the other hand, strengthen personnel safety awareness, standardize operation behaviors and refine on-site management. Through all-round and normalized safety control, all types of safety hidden dangers can be eliminated, production accidents effectively avoided, personnel life safety and stable enterprise production guaranteed, and safe, efficient and orderly injection molding production realized.
