Extrusion & Post
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Rapid Screen Pack Blockage in PE Extrusion
Problem Phenomenon
The screen pack in PE extrusion is replaced frequently and die pressure rises quickly, affecting continuous production.
Cause Analysis
Raw material has many impurities, regrind is contaminated, or there is much carbonized material; PE (especially LDPE) easily oxidizes and gels, and the screen pack intercepts crosslinked matter that accumulates; unreasonable mesh configuration of the screen pack also accelerates blockage.
Solution
①Improve raw material cleanliness and control regrind quality; ②Standardize shutdowns to prevent oxidative gelation; ③Configure the screen pack in a coarse→fine gradient; ④Clean die dead spots; ⑤Use an automatic screen changer when output is large.
Key Takeaway
If the PE screen pack blocks quickly, first distinguish 'impurities' from 'gel': impurities rely on material source management, gel relies on shutdown and dead-spot management; the screen pack is a consumable and, more importantly, a diagnostic window.
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