Material Drying
3 조회수
Gel particles and fisheyes on PET sheet surface
문제 현상
Transparent or opaque tiny particles appear on the PET extruded sheet surface, affecting appearance and subsequent processing.
원인 분석
Material mixed with high-melting impurities or crosslinked gels, material stays too long at screw dead corners forming gels, drying temperature too high causing solid-state polycondensation.
해결 방법
Clean screw and barrel to eliminate dead corners; control drying temperature ≤175°C; appropriately increase processing temperature to melt gel particles; use filter screens.
핵심 요약
PET gel particles originate from impurities, degradation, or excessive drying.
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