Material Analysis
10 조회수
PA6 Regrind Control
문제 현상
After blending regrind, product strength decreases, appearance black specks increase, and batch differences are large
원인 분석
PA6 regrind decreases in molecular weight after experiencing thermal history, and performance cumulatively deteriorates after multiple cycles; regrind of unknown origin may also be mixed with other polymers and contaminants
해결 방법
①Control the regrind ratio within 20% and dry it separately; ②test melt index and impact strength by batch; ③restrict regrind use in load-bearing and appearance parts; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
핵심 요약
The value of PA6 regrind decreases with thermal history; ratio limitation, batch testing, and application grading are the three disciplines of regrind use; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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