Material Drying
5 مشاهدة
Gel particles and fisheyes on PET sheet surface
ظاهرة المشكلة
Transparent or opaque tiny particles appear on the PET extruded sheet surface, affecting appearance and subsequent processing.
تحليل الأسباب
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.
الحل
Clean screw and barrel to eliminate dead corners; control drying temperature ≤175°C; appropriately increase processing temperature to melt gel particles; use filter screens.
الخلاصة الأساسية
PET gel particles originate from impurities, degradation, or excessive drying.
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