FHG PET Injection Molding Machine 100ton-650ton - China Suppliers & Factory for Food-Grade Production
01 Injection Unit — Product Gallery
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Injection Unit — Overview
Injection Unit — Overview
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Injection Unit — Detail View 1
Injection Unit — Detail View 1
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Injection Unit — Detail View 2
Injection Unit — Detail View 2
Frequently Asked Questions
Q
What is the main function of the Injection Unit in an injection molding machine?
The injection unit is the core component responsible for melting plastic raw material and injecting it under high pressure into the mold cavity. It controls the plasticizing, metering, and injection processes to ensure consistent part quality and dimensional accuracy.
Q
What types of plastic materials can the Injection Unit process?
The injection unit is designed to process a wide range of thermoplastic materials, including PP, PE, ABS, PC, POM, PA (Nylon), PET, and engineering-grade resins. The screw geometry and barrel material can be customized based on the specific resin requirements.
Q
How does injection pressure affect the quality of molded parts?
Injection pressure directly influences how completely and uniformly the molten plastic fills the mold. Insufficient pressure can cause short shots or sink marks, while excessive pressure may lead to flash, warpage, or residual stress in the finished part. Precise pressure control is essential for optimal results.
Q
What maintenance is required for the Injection Unit?
Regular maintenance includes inspecting and cleaning the screw and barrel, checking for wear on the check ring and nozzle, lubricating mechanical components, verifying temperature sensor calibration, and purging the barrel when switching materials. Scheduled preventive maintenance helps extend service life and maintain production efficiency.
Q
How is the injection unit size or specification selected for a specific application?
Selection is based on several factors including the shot weight of the part, the type of resin, required injection speed and pressure, and cycle time targets. The injection unit's shot capacity should typically be 20%–80% of the barrel's theoretical shot volume to ensure material residence time is optimized and degradation is avoided.
Q
Can the Injection Unit be customized or upgraded for special production needs?
Yes. The injection unit can be configured with specialized screws (e.g., barrier screws, mixing screws), hardened or bimetallic barrels for abrasive or corrosive materials, vented barrels for moisture-sensitive resins, and advanced control systems for precise process monitoring. Please contact our technical team to discuss your specific application requirements.