Material Drying
9 مشاهدة
PET Preform IV Drop (Intrinsic Viscosity Decrease)
ظاهرة المشكلة
The same batch of resin has decreased blowing strength, and the bottle body is brittle.
تحليل الأسباب
Hydrolysis and thermal degradation reduce PET intrinsic viscosity (IV); insufficient drying, excessive material temperature, too long residence, and multiple heat histories (recycling) all cause IV drop.
الحل
①Strict drying; ②dual control of material temperature and residence; ③test the IV value of incoming material and preforms; ④evaluate IV of old inventory preforms before use.
الخلاصة الأساسية
IV is the general ledger of PET processing quality.
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