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Injection Unit — Product Gallery
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Frequently Asked Questions
Q1
What is an injection unit and what is its primary function?
The injection unit is a core component of an injection molding machine. Its primary function is to melt plastic pellets or granules and inject the molten material into a mold cavity under controlled pressure and speed, forming the desired part shape.
Q2
What are the main components of an injection unit?
An injection unit typically consists of a hopper (for feeding raw material), a heated barrel, a reciprocating screw or plunger, a nozzle, and drive mechanisms. Together, these components control the melting, metering, and injection of the plastic material.
Q3
What materials can be processed by an injection unit?
Injection units are compatible with a wide range of thermoplastic and thermosetting materials, including PP, PE, ABS, PC, Nylon (PA), PVC, POM, and many engineering-grade plastics. Material selection depends on the barrel temperature range and screw design.
Q4
How is injection pressure controlled in the injection unit?
Injection pressure is precisely controlled through the machine's hydraulic or electric drive system, combined with programmable control units (PLC/CNC). Operators can set and adjust injection pressure, holding pressure, and injection speed profiles to ensure consistent part quality.
Q5
How do I maintain and clean the injection unit?
Regular maintenance includes purging the barrel with a compatible purging compound when changing materials, inspecting the screw and barrel for wear, checking heater bands and thermocouples, and lubricating moving parts per the manufacturer's schedule. Proper maintenance extends service life and ensures consistent performance.
Q6
What factors should I consider when selecting an injection unit for my application?
Key factors include shot size (injection volume), injection pressure and speed requirements, the type of plastic material to be processed, screw diameter and L/D ratio, clamping force compatibility, and the required production output. Consulting with a specialist ensures the optimal unit is selected for your specific needs.