What is the purpose of the screw in the injection barrel?

Jun 07,2024

The screw in the injection barrel of an injection molding machine serves several crucial purposes:

1. Material Transport: The screw rotates to transport the plastic material from the hopper to the front of the barrel. As the screw turns, it moves the material forward.

2. Melting: The rotation of the screw generates heat through shear forces, which, along with external heaters, melts the plastic. The design of the screw helps in the efficient melting of the plastic material.

3. Mixing: The screw mixes the molten plastic to ensure a homogeneous melt. This is important for achieving consistent quality in the final product.

4. Metering: The screw controls the amount of molten plastic that is injected into the mold. This precise control ensures that the right amount of material is used for each injection cycle, which is crucial for maintaining product quality and minimizing waste.

5. Injection: During the injection phase, the screw acts as a plunger, pushing the molten plastic into the mold cavity under high pressure. This ensures that the material fills the mold completely and accurately.

In summary, the screw in the injection barrel is essential for feeding, melting, mixing, metering, and injecting the plastic material, making it a critical component of the injection molding process.
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