FHG Servo Motor Injection Molding Machine 100ton-1680ton - Reliable China Suppliers & Factory for High-Efficiency Production
Injection Unit
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INJECTION UNIT
INJECTION UNIT — View 01
INJECTION UNIT — View 02
Frequently Asked Questions
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 raw material and injecting it into the mold cavity under high pressure. It typically consists of a hopper, barrel, screw, and nozzle working together to deliver precise, consistent shots of molten material.
Q
What materials can the injection unit process?
Modern injection units are engineered to process a wide range of thermoplastic and thermosetting materials, including PP, PE, ABS, PVC, Nylon, PC, POM, and many engineering-grade resins. The screw and barrel design can be customized to suit specific material requirements.
Q
How does injection pressure affect product quality?
Injection pressure directly influences how well the molten plastic fills the mold cavity. Insufficient pressure can lead to short shots or surface defects, while excessive pressure may cause flash or structural stress in the finished part. Proper pressure calibration ensures dimensional accuracy and consistent product quality.
Q
How is the injection unit maintained and serviced?
Regular maintenance of the injection unit includes cleaning the barrel and screw, inspecting the nozzle for wear, checking seals and hydraulic connections, and purging residual material after production. Scheduled preventive maintenance extends service life and ensures stable machine performance over time.
Q
What is the difference between a standard screw and a specialized screw in the injection unit?
A standard general-purpose screw is suitable for most common thermoplastics, while specialized screws — such as barrier screws, mixing screws, or high-compression screws — are designed for specific materials or applications. The choice of screw geometry significantly impacts plasticizing efficiency, melt homogeneity, and cycle time.
Q
Can the injection unit be customized for specific production requirements?
Yes. Injection units can be tailored in terms of screw diameter, L/D ratio, shot capacity, injection speed, and pressure range to meet the specific demands of different industries and applications — from thin-wall packaging to large structural automotive components.