Injection Molding
6 조회수
PET Injection Preform Gate Crystallization (Whitening)
문제 현상
Whitening around the preform gate, and the bottom easily cracks during blowing.
원인 분석
Gate zone shear heat + uneven cooling cause local crystallization; crystallized preforms cannot be oriented during blowing, and the bottom strength is poor.
해결 방법
①Optimize gate temperature and cooling; ②reduce gate zone shear; ③check hot runner gate temperature control; ④reject whitened preforms.
핵심 요약
Gate whitening = local crystallization, a hidden danger at the bottom.
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