High-Precision FHG Series Plastic Injection Molding Machine from China Suppliers | Reliable Factory Solution
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INJECTION UNIT
INJECTION UNIT
INJECTION UNIT — View 01
INJECTION UNIT — View 02
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Frequently Asked Questions
Q
What is an injection unit in an injection molding machine?
The injection unit is the core component responsible for melting plastic material and injecting it under high pressure into the mold cavity. It typically consists of a hopper, barrel, screw, and nozzle working together to process and deliver molten plastic precisely.
Q
What are the main functions of the injection unit?
The injection unit performs three key functions: plasticizing (melting raw plastic pellets using heat and screw rotation), metering (measuring the correct shot volume), and injecting (pushing the molten plastic into the mold at controlled speed and pressure).
Q
How does the screw design affect injection unit performance?
The screw geometry — including its diameter, length-to-diameter ratio, and compression ratio — directly affects plasticizing efficiency, melt homogeneity, and cycle time. Specialized screw designs are available for different materials such as PVC, nylon, or engineering-grade plastics.
Q
What parameters are critical for the injection unit during production?
Key parameters include injection pressure, injection speed, back pressure, screw rotation speed, barrel temperature zones, and shot size. Precise control of these parameters ensures consistent part quality, minimal defects, and optimal cycle efficiency.
Q
How should the injection unit be maintained?
Regular maintenance includes purging the barrel when changing materials, inspecting and replacing worn screws or check rings, cleaning the nozzle tip, lubricating moving components, and verifying temperature sensor accuracy. Preventive maintenance schedules help extend service life and maintain production quality.
Q
What materials can be processed by this injection unit?
Modern injection units are engineered to process a wide range of thermoplastic materials including PP, PE, ABS, PC, nylon (PA), POM, PET, and various engineering and high-performance polymers. Material compatibility depends on the barrel temperature range, screw design, and corrosion-resistant coatings used.