Molding Process 5 조회수

EMA Extruded Film Thick Edges and Thin Middle

문제 현상

EMA extruded film edges are 20-30% thicker than the middle, thickness showing a U-shaped distribution

원인 분석

Improper die flow channel design, low resistance and large flow at the edges; EMA melt elasticity swells more at the edges; air ring cooling has different effects at the edges

해결 방법

1) Adopt coat-hanger design for the die to balance the resistance between the middle and the edges; 2) Fine-tune the die gap, slightly larger in the middle and slightly smaller at the edges for compensation; 3) Slightly reduce the air volume at the air ring edges; 4) Add restrictor bars to adjust edge flow

핵심 요약

U-shaped thickness is caused by die flow channel and swell differences; coat-hanger die and gap fine-tuning are key

EMA film thickness distribution coat-hanger die gap fine-tuning edge effect

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EMA Extruded Film Thick Edges and Thin Middle

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