High-Precision Plastic Color Mixer from China Suppliers | Fuhong Factory CE-Certified Solution

The primary function of an injection unit in an injection molding machine is to melt the plastic raw material, homogenize it, and inject the molten plastic into the mold cavity under high pressure.

An injection unit typically consists of a hopper for feeding material, a heated barrel, a reciprocating screw for melting and conveying plastic, heating bands, and hydraulic or electric injection cylinders.

Selecting the correct size depends on the required shot weight, the plastic material type, and the mold design. Ideally, the shot size should utilize between 30% and 70% of the injection unit's maximum capacity.

Regular maintenance includes checking the screw and barrel for wear, inspecting the heater bands and thermocouples, verifying alignment, and performing routine purges to prevent material degradation.

The screw design, including its L/D ratio and compression ratio, directly influences the melting rate, mixing efficiency, and throughput of the plastic material, ensuring consistent part quality.