Molds & Tooling
4 조회수
PVC Yellowing Graded Early Warning
문제 현상
Slight yellowing of products was not taken seriously; after continued production it quickly turned brown and black, and the whole batch was scrapped
원인 분석
The color evolution of PVC degradation is a graded early warning: yellowing at 200-210°C, browning with HCl release at 210-220°C, blackening above 230°C; conjugated polyene sequences develop color, and color is the indicator of degradation degree
해결 방법
①Immediately lower temperature and troubleshoot upon finding yellowing; ②scrap the entire batch of browned material and do not reuse it; ③establish a color grading and disposal comparison table to train operators; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
핵심 요약
Color is the thermometer of PVC degradation; yellow means warn, brown means stop, black means scrap—graded response is written into the work instruction; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!