Extrusion & Post
4 조회수
Die marks/lines appear on heat-resistant polyethylene extruded products
문제 현상
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.
원인 분석
(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
해결 방법
(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
핵심 요약
Die marks are caused by die inner wall damage or impurities, and the die condition needs to be regularly cleaned and inspected.
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