Injection Molding
6 조회수
Strength Decrease of PE Injection Molded Products
문제 현상
PE parts fail mechanical tests and are brittle, yet show no obvious appearance abnormality.
원인 분석
An excessive regrind proportion brings molecular weight decrease, too long heat history causes degradation, weld lines happen to pass through stressed areas forming weak bands, and water-containing regrind triggers internal microvoids; these factors all quietly weaken strength without changing the appearance, which appearance inspection simply cannot detect.
해결 방법
①Control the regrind proportion and re-dry it; ②Stabilize heat history (melt temperature, residence time); ③Keep weld lines away from stressed areas; ④Investigate internal microvoids; ⑤Carry out sampling inspection of mechanical properties.
핵심 요약
PE 'strength decrease with normal appearance' = a material history problem: regrind, heat history, and weld line position are the three major suspects; strength must be guaranteed by process data and sampling inspection, not by appearance alone.
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!