FHG Series PET Injection Molding Machine 100-650ton - Energy-Efficient, Trusted China Suppliers & Factory
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01 Injection Unit
Injection Unit — View 1
Injection Unit — View 2
Injection Unit — View 3
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Frequently Asked Questions
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Q What is the function of the injection unit in an injection molding machine?The injection unit is responsible for melting raw plastic material and injecting it under high pressure into the mold cavity. It controls the plasticizing, metering, and injection processes to ensure consistent part quality.
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Q What are the main components of an injection unit?The main components include the hopper, barrel, reciprocating screw, nozzle, heater bands, and drive system. Each component plays a critical role in the plasticizing and injection stages of the molding cycle.
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Q How does injection pressure affect the molding process?Injection pressure determines how quickly and completely the molten plastic fills the mold cavity. Too low a pressure can cause short shots or incomplete filling, while excessive pressure may cause flash or damage the mold.
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Q What materials can be processed by the injection unit?The injection unit is compatible with a wide range of thermoplastic materials including PP, PE, ABS, PC, PA (Nylon), POM, PET, and engineering-grade polymers. The barrel and screw design may vary depending on the material type.
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Q How is the injection unit maintained to ensure long service life?Regular maintenance includes cleaning the barrel and screw, inspecting the nozzle for wear or blockage, checking heater bands and thermocouples, and lubricating moving parts. Proper purging procedures when changing materials are also essential.
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Q What is the difference between a standard and a high-performance injection unit?A high-performance injection unit typically features advanced screw geometry for better plasticizing efficiency, higher injection speeds, improved temperature control accuracy, and enhanced pressure response — making it suitable for precision molding and demanding engineering materials.