China FHG PET Injection Molding Machine 100ton-650ton - Reliable Suppliers and Factory for High-Quality Production
Frequently Asked Questions
What is the primary function of the injection unit?
The injection unit of an injection molding machine is designed to melt the plastic raw materials, homogenize the melt, and then inject the molten plastic under high pressure into the mold cavity.
What are the main components of the injection unit?
The key components include the material hopper, the heating barrel, the reciprocating screw, the injection cylinders, and the nozzle. These parts work together to heat, mix, and transport the plastic material.
How does the screw inside the injection unit operate?
The screw performs a reciprocating motion. It rotates to feed and melt the plastic pellets while moving backward to accumulate a charge of melt. Once ready, it acts as a plunger, moving forward rapidly to inject the melt into the mold.
Why is temperature control critical in the injection unit?
Precise temperature control prevents the plastic material from degrading or burning, ensures uniform viscosity of the melt, and guarantees consistency in the quality of the molded parts.
What maintenance does the injection unit require?
Regular maintenance includes purging the barrel to remove material residues, inspecting the screw and barrel for wear, calibrating the heating bands, and checking the hydraulic or electrical drive systems for optimal performance.