Extrusion & Post
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PE Extrusion Screw Slippage and Plasticization Fluctuation
Problem Phenomenon
During plasticization, the screw makes abnormal noises, the discharge fluctuates between more and less, the main motor current fluctuates greatly, and the product quality becomes unstable accordingly.
Cause Analysis
Excessive feed zone temperature causes the PE pellets to melt prematurely and wrap the screw causing slippage, or hopper bridging and abnormal pellet shapes (powder/film material mixed in) make the conveying unstable; screw feed zone wear also causes conveying efficiency fluctuations.
Solution
①Lower the feed zone temperature and strengthen the hopper throat cooling; ②check and eliminate feeding bridging; ③evaluate the screw feed zone wear; ④control the ratio and shape of powder/regrind; ⑤use forced feeding or grooved feed bushings if necessary.
Key Takeaway
For PE discharge pulsation, first check 'feed zone temperature + feeding': slippage and bridging are the two most common roots; the feed zone is the starting point of extrusion stability—if problems occur here, no matter how accurate the downstream temperature control is, it is useless.
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