Extrusion & Post
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Die Pressure Fluctuation in PE Extrusion
Problem Phenomenon
During PE extrusion, the die pressure gauge pointer fluctuates, product dimensions and appearance fluctuate accordingly, and stable production is impossible.
Cause Analysis
Unstable feeding, screw wear, screen pack blockage, or temperature fluctuation all cause melt pressure pulsation; pressure fluctuation is directly transmitted as uneven output, affecting product consistency.
Solution
①Check the feeding system and hopper cooling to eliminate bridging; ②Measure screw clearance to evaluate wear; ③Replace the screen pack and monitor the pressure differential; ④Stabilize the temperature control system; ⑤Install a melt pump to stabilize pressure if necessary.
Key Takeaway
Trace PE die pressure fluctuation in the order of 'material → screw → screen → temperature': pressure is a comprehensive indicator of extrusion system health; if fluctuation persists, don't expect stable products — stabilize the pressure first.
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