What is the use of screw barrel?

May 11,2024

A screw barrel, also known as an auger or helical shaft, is a cylindrical rod with a helical ridge, or screw-like threads, running along its length. Screw barrels are primarily used in machinery, particularly in extrusion and injection molding processes. Here's a breakdown of their main uses:

Extrusion: In extrusion processes, screw barrels are used to push materials, such as plastic pellets or rubber compounds, through a heated barrel. The material is melted and then forced through a die to create continuous shapes, such as pipes, tubing, or sheets.

Injection Molding: Screw barrels play a crucial role in injection molding machines. They are responsible for melting the raw material (usually plastic pellets) and injecting it into a mold cavity under high pressure. The screw's rotation and movement forward and backward control the flow and pressure of the molten material.

Compounding: In compounding processes, screw barrels are used to mix and blend various materials together. This can include additives, fillers, and pigments with a base material to create custom polymer compounds with specific properties.

Extrusion Blow Molding: In blow molding processes, screw barrels help melt and shape the plastic material into a hollow form, which is then blown into a mold cavity to create products like bottles, containers, and automotive components.

Overall, screw barrels are essential components in various manufacturing processes, enabling the efficient processing and shaping of materials in industries ranging from plastics and rubber to food processing and pharmaceuticals.


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