Injection Molding
11 조회수
Burning from poor venting in PET preform '2079851475616104452
문제 현상
Burn marks or black spots appear at the PET preform end (far from the gate), accompanied by irritating odor.
원인 분석
Poor cavity venting; air rapidly compressed producing high temperature (diesel effect) causing local burning, vent grooves blocked or injection too fast.
해결 방법
Deepen and widen vent grooves (0.02-0.04mm); clean accumulated material; appropriately reduce injection speed; optimize gate position.
핵심 요약
PET preform burning is the result of air not being able to escape in time; improving venting is fundamental.
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!