China PVC Injection Molding Machine 100ton-800ton - Reliable Suppliers and Factory Solutions for Custom Production
01 INJECTION UNIT
01 INJECTION UNIT 1
01 INJECTION UNIT 2
Frequently Asked Questions
What is the primary function of an injection unit?
The injection unit is responsible for melting the plastic material, homogenizing it, and injecting it under high pressure into the mold cavity to form the molded part.
What are the key components of an injection unit?
An injection unit typically consists of a hopper, a barrel, a reciprocating screw, heating bands, a nozzle, and the hydraulic or electric drive mechanism that controls screw rotation and injection movement.
How does screw design affect the performance of the injection unit?
The screw design (including feed, compression, and metering zones) determines how efficiently the plastic is melted, mixed, and conveyed. Different materials require specific screw designs to prevent degradation and ensure consistent shot quality.
What maintenance is required for the injection unit?
Regular maintenance includes checking heater band functionality, inspecting the screw and barrel for wear, ensuring proper alignment of the nozzle, cleaning the hopper, and monitoring hydraulic seals and lubrication points.
Why is temperature control critical in the injection unit?
Precise temperature control prevents material degradation from overheating and ensures complete melting. Improper temperatures can cause defects like burn marks, weak structures, or incomplete mold filling.