Extrusion & Post
4 조회수
PETG extrusion cast film edge thickening
문제 현상
Bead-like thickening appears at the edges of the cast film, with a large thickness difference from the middle.
원인 분석
After the melt leaves the die, the edge contraction effect (die swell) and surface tension cause thickening, and the cast draw ratio is insufficient.
해결 방법
Increase the cast draw ratio (air gap adjustment); optimize the die edge compensation design; appropriately lower the melt temperature.
핵심 요약
PETG cast film edge thickening is a common phenomenon.
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