Extrusion & Post
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Die marks/lines appear on heat-resistant polyethylene extruded products (Variant: strengthened measures)
Fenómeno del problema
Continuous lines or marks appear on the extrudate surface along the extrusion direction at fixed positions.
Die marks affect product appearance and are especially obvious in transparent products and films.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Análisis de la causa
(1) Scratches or damage on die inner wall
(2) Impurities or carbonized matter accumulated in the die
(3) Unreasonable die flow channel design with stagnation zones
(4) Die joints uneven
(5) Breaker plate or screen pack broken, impurities pass through
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solución
(1) Disassemble the mold to check the die inner wall, grind and polish to repair scratches
(2) Clean impurities and carbonized matter in the die, use copper tools to avoid damage
(3) Optimize die flow channel design, eliminate stagnation dead corners
(4) Grind the die joints flat to ensure no steps
(5) Replace the breaker plate and screen pack, replace regularly to prevent breakage
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Conclusión clave
Die marks are caused by die inner wall damage or impurities, and the die condition needs to be regularly cleaned and inspected.
Targeted preventive measures need to be taken in different production scenarios.
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