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01 INJECTION UNIT
01 INJECTION UNIT 2
01 INJECTION UNIT 3
Frequently Asked Questions
Q:
What is the primary function of an injection unit?
The primary function of an injection unit is to melt the plastic raw materials, meter the precise volume of molten plastic required for a shot, and inject it under high pressure into the mold cavity.
Q:
What are the key components of an injection unit?
An injection unit typically consists of a material hopper, a heated barrel, a reciprocating screw, a non-return valve, and the hydraulic or electric drive system that controls the movement of the screw.
Q:
How does screw design affect the injection process?
The screw design determines the efficiency of plasticization, mixing, and melt uniformity. Different plastics require specific screw geometries (such as flight depth and compression ratios) to prevent material degradation and ensure consistent quality.
Q:
Why is temperature control critical in the injection unit?
Precise temperature control prevents the polymer from overheating and degrading, while ensuring it is fluid enough for proper injection. It directly impacts the physical properties and surface finish of the molded parts.
Q:
How do you maintain the injection unit for long-term performance?
Regular maintenance includes routine barrel purging to remove residue, checking heating band functionality, inspecting the screw and check-ring for wear, and ensuring proper calibration of injection pressure sensors.