FHG Servo Motor Injection Molding Machine 100ton-1680ton - High-Efficiency China Suppliers Factory Equipment
Injection Unit
Injection Unit
Injection Unit — View 01
Injection Unit — View 02
Frequently Asked Questions
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Q 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 high pressure. It typically consists of a hopper, barrel, screw, and nozzle.
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Q 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 plastic into the mold at controlled speed and pressure).
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Q How does the screw design affect injection unit performance?The screw geometry — including its length-to-diameter ratio, compression ratio, and flight depth — directly influences the melting efficiency, mixing quality, and injection consistency. Different screw designs are optimized for specific materials and applications.
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Q What materials can be processed by the injection unit?Modern injection units are capable of processing a wide range of thermoplastic materials, including PP, PE, ABS, PC, POM, nylon, and engineering-grade plastics. Special configurations are available for high-temperature or abrasive materials.
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Q How is injection pressure controlled in the injection unit?Injection pressure is precisely controlled through the hydraulic or servo-electric drive system. Operators can set and monitor injection pressure, holding pressure, and back pressure via the machine's control panel to ensure consistent part quality.
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Q What maintenance is required for the injection unit?Regular maintenance of the injection unit includes cleaning the barrel and screw, inspecting and replacing worn check rings or nozzle tips, lubricating moving parts, and monitoring heating band performance. Scheduled preventive maintenance helps extend the unit's service life and maintain production quality.