Processing Machinery
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Poor Plasticization Caused by Screw Wear of Polypropylene Extruder
Problem Phenomenon
Unmelted particles appear in the product, the surface is rough, and the plasticization quality decreases.
Screw wear weakens the shearing and mixing effects, and the melt quality is unstable.
Cause Analysis
(1) The screw is worn after long-term use, and the clearance between the flights and the barrel increases
(2) The raw material contains hard fillers that accelerate wear
(3) The wear resistance of the screw material is insufficient
(4) The screw speed is too high, aggravating wear
(5) The barrel temperature is set improperly, causing local overload
Solution
(1) Check the wear of the screw; repair or replace it if the clearance exceeds 0.2mm
(2) Select wear-resistant screw materials or bimetallic screws
(3) Reduce the screw speed for filler-containing raw materials
(4) Optimize the barrel temperature setting to ensure each section is at a reasonable value within the range of 200-280°C
(5) Regularly maintain the screw and clean the attachments on the screw surface
Key Takeaway
Screw wear leads to a decrease in plasticization efficiency, and needs to be solved by selecting wear-resistant materials and regular maintenance.
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