Extrusion & Post
4 조회수
PBAT melt index too high and blown film unstable
문제 현상
PBAT melt flow index is too high (>15g/10min), the blown film bubble is unstable, and thickness fluctuation is large.
원인 분석
PBAT molecular weight is low or degradation causes the melt index to be too high; flowability too good makes the film bubble difficult to shape; melt strength and flowability are unbalanced; recycled material blending reduces molecular weight.
해결 방법
①Select a grade with moderate melt index; ②chain extender to increase molecular weight and reduce melt index; ③control processing temperature to prevent degradation; ④limit recycled material proportion.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
핵심 요약
PBAT melt index management is the prerequisite for blown film stability; chain extender is the adjustment means; degradation prevention starts from the source.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!