Material Drying
7 조회수
PET Preform IV Drop (Intrinsic Viscosity Decrease)
문제 현상
The same batch of resin has decreased blowing strength, and the bottle body is brittle.
원인 분석
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.
해결 방법
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.
핵심 요약
IV is the general ledger of PET processing quality.
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