Injection Molding
11 조회수
Crystalline White Spots Near the Gate of PBT Injection-Molded Parts
문제 현상
White opaque areas appear near the gate of PBT products, with an obvious color difference from the main body.
원인 분석
Shear-induced crystallization at the gate forms spherulites; rapid cooling causes incomplete crystal growth, resulting in whitening; the gate size is too small and the shear is large.
해결 방법
Increase the gate size to reduce shear; increase the mold temperature in this area; reduce the injection speed.
핵심 요약
PBT gate white spots are the result of shear-induced crystallization.
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