Extrusion & Post
4 조회수
Excessive thermal shrinkage rate of PET biaxially stretched film
문제 현상
The thermal shrinkage rate of PET film exceeds the standard (longitudinal >3%, transverse >2%), causing inaccurate printing registration.
원인 분석
Insufficient heat setting treatment after stretching (temperature on the low side or time insufficient); large draw ratio results in high internal stress; cooling is too fast.
해결 방법
Increase heat setting temperature to 200-230°C; increase setting time; appropriately reduce the draw ratio; control cooling rate.
핵심 요약
PET film thermal shrinkage rate is dominated by the heat setting process.
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!