Molding Process
4 조회수
PET Bottle Thin Shoulder
문제 현상
Shoulder wall thickness too thin, shoulder cracks on drop.
원인 분석
The lamp zone temperature corresponding to the shoulder is high or the pre-blow distributes the material to the bottle body too early; the preform shoulder wall thickness design is insufficient.
해결 방법
①Lower the upper lamp zone or strengthen ventilation there; ②optimize pre-blow timing; ③evaluate the preform shoulder design.
핵심 요약
Thin shoulder = upper heat + pre-blow rhythm.
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