FHG Servo Motor Injection Molding Machine 100ton-1680ton - High Efficiency from China Suppliers and Factory
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Injection Unit
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Frequently Asked Questions
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What is an injection unit in an injection molding machine?
The injection unit is the core component of an injection molding machine responsible for melting plastic material and injecting it into the mold cavity under controlled pressure and speed. It typically consists of a hopper, barrel, screw, and nozzle.
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What are the main functions of the injection unit?
The injection unit performs three primary functions: plasticizing (melting the raw material), metering (measuring the correct shot volume), and injecting (pushing the molten material into the mold at precise speed and pressure).
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How does the screw design affect injection unit performance?
The screw geometry — including its L/D ratio, compression ratio, and flight depth — directly influences plasticizing efficiency, melt homogeneity, and energy consumption. Different screw designs are optimized for specific materials such as PVC, PA, or engineering resins.
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What materials can be processed by the injection unit?
Modern injection units are capable of processing a wide range of thermoplastic and thermosetting materials, including PP, PE, ABS, PC, Nylon, POM, TPU, and various glass-fiber or mineral-filled compounds, depending on the screw and barrel configuration.
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How is injection pressure controlled in the injection unit?
Injection pressure is precisely controlled via hydraulic or servo-electric drive systems. Modern machines use closed-loop feedback control to maintain consistent pressure profiles throughout the injection and packing phases, ensuring dimensional accuracy and part quality.
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How should the injection unit be maintained for long-term reliability?
Regular maintenance includes purging the barrel between material changes, inspecting and replacing worn screw and barrel components, checking nozzle tip condition, monitoring temperature zone calibration, and lubricating all moving parts according to the manufacturer's recommended schedule.