Molds & Tooling
4 조회수
HDPE film PPA eliminating die lip buildup
문제 현상
Serious die lip buildup requires frequent shutdown for cleaning; the buildup disappears after adding a fluorine-containing processing aid.
원인 분석
Melt wall adsorption and stress concentration at the die lip make degraded material gradually accumulate; PPA forms a lubricating layer on the die wall, preventing the buildup from adhering.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
해결 방법
①Add 300ppm-level PPA processing aid; ②establish a record of the onset time; ③coordinate with die lip temperature optimization; ④regularly evaluate the additive effect.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
핵심 요약
PPA is a highly efficient means of eliminating die lip buildup; it takes effect at a low addition amount, but attention should be paid to uniform dispersion and onset time.; 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!