Molds & Tooling
3 조회수
PET bottle crystallization spots from uneven cooling
문제 현상
Cloudy patches appear at fixed positions on the bottle body, and thermal imaging shows that the temperature of the corresponding mold area is higher.
원인 분석
Uneven layout or partial blockage of the mold cooling water channels makes the corresponding area of the bottle body dissipate heat slowly, and PET forms crystallization spots there; thermal imaging can visually display the hot spots.
해결 방법
①Use a thermal imager to locate mold hot spots; ②unblock and modify the cooling water channels; ③balance the cooling flow of each cavity; ④verify the elimination of crystallization spots after improvement.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
핵심 요약
Crystallization spots at fixed positions point to uneven mold cooling; thermal imaging is an efficient locating tool, and the patches usually disappear immediately after water channel modification.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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