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Plastic forming process where a plastic melt is pressed through a die to create an axially symmetric profile.

Illustration of Extrusion

The process

Plastic pellets [1] are supplied via a hopper into a rotating screw [2] whose spiral shape moves the pellet forward through a heated chamber [3].The pellets are heated gradually and turns into a homogeneous plastic melt as it approaches the end of the helical screw.

The molten mass is pushed through a cold die [4] where it is formed and solidified to an axially symmetric profile.

Advantages and disadvantages
In comparison with alternative methods
Low cost, better flexibility
Consistent cross section
Allows easy changes after extrusion process
Continuous process
No actual length limit
Significantly dimension deviation due to expansion
Limited types of products can be made