The working principle of a plastic extruder
Time：
2025-06-22
The operating principle of a plastic extruder is to convert solid plastic pellets into a molten state through heating and screw rotation, then extrude them to form the desired shape.
1. Material feeding: Plastic raw material (e.g., pellets) enters the extruder from the hopper. 
2. Heating and Melting: External heating elements in the barrel raise the material to a molten state, while the rotating screw generates shear heat, further accelerating the melting process. 
3. Screw Conveying and Compression: The screw advances the molten plastic by means of its threads, while the thread depth gradually decreases, thereby compressing the material and increasing its density. 
4. Mixing and Plasticization: The rotation of the screw and the shear forces generated by the barrel’s inner wall ensure thorough mixing and plasticization of the polymer, resulting in a uniform melt. 
5. Extrusion Molding: The molten polymer is forced through a die of a specific cross-section to form the desired shape (such as tubing or sheet), and then cooled and set to produce the finished product.
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