Extrusion & Post
10 조회수
CEF film thermal shrinkage rate too large
문제 현상
The thermal shrinkage rate of the CEF film at 80°C is >12%, exceeding the 5% dimensional stability requirement
원인 분석
The CEF extrusion orientation is released after heating, leading to large shrinkage; CEF has a large thermal expansion coefficient; the film cooling froze a large amount of orientation stress
해결 방법
1) Reduce the extrusion draw ratio to reduce orientation freezing; 2) Anneal the film at 60-80°C to release orientation stress; 3) Add 5-10wt% rigid resin to reduce the thermal shrinkage rate; 4) Biaxial stretching process to balance orientation
핵심 요약
Film thermal shrinkage is caused by orientation freezing; reducing the draw ratio and annealing treatment are the key
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