Injection Molding
13 مشاهدة
Post-shrinkage of PBT injection molded parts
ظاهرة المشكلة
PBT products continue to shrink after demolding, the size keeps changing, affecting assembly accuracy.
تحليل الأسباب
PBT cools quickly in the mold and crystallization is incomplete; after demolding, crystallization continues at ambient temperature (post-crystallization), accompanied by volume shrinkage.
الحل
Ensure the mold temperature is high enough (80-120°C) for sufficient crystallization; extend the cooling time; anneal at 120°C/1-2h after molding.
الخلاصة الأساسية
The root cause of PBT post-shrinkage is incomplete crystallization; mold temperature and annealing are the control means.
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