Processing Machinery
3 조회수
Shutdown Carbonization Failure of PEEK
문제 현상
When PEEK production resumes after a mid-run shutdown of more than 15 minutes, the first batch of products shows a concentrated outbreak of yellowing, black specks, and silver streaks, requiring multiple shots to return to normal.
원인 분석
During the shutdown, the PEEK in the barrel continuously thermally degrades above 380℃, the melt carbonizes, discolors, and generates gas; the longer the residence time, the thicker the degraded layer, and the degraded material is gradually mixed into the products after restarting.
해결 방법
①If a shutdown of more than 15 minutes is expected, immediately lower the barrel temperature to a safe range; ②For long shutdowns, displace and drain with a dedicated purging compound; ③Fully discharge material and extend purging shots before resuming production; ④Establish shutdown operation specifications.
핵심 요약
The core of PEEK shutdown management is dual control of time and temperature; 15 minutes is the empirical red line; the cost of discharging material at shutdown is far lower than batch scrap caused by degraded material mixing in.
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!