Molds & Tooling
4 조회수
PPO burnt marks
문제 현상
Burnt marks and brown streaks appear at fixed positions of PPO products, mostly at flow ends and material convergence areas; they improve briefly after machine purging and then recur.
원인 분석
When mold venting is poor, the compressed air heats up adiabatically and burns the melt; stagnant material dead spots in the barrel and nozzle decompose under long-term heating and are carried into the product; excessive melt temperature aggravates the heat damage risk.
해결 방법
①For fixed-position burning, prioritize checking venting and adding vent grooves; ②clean the stagnant material dead spots of the barrel and nozzle; ③appropriately reduce the melt and mold temperatures; ④adjust the filling rate to prevent trapped gas.
핵심 요약
For PPO burning, first distinguish the two causes of venting trapped gas and equipment stagnant material; fixed positions are characteristic of venting problems; random distribution points to equipment dead spots.; 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!