Material Drying
8 Aufrufe
Gel particles and fisheyes on PET sheet surface
Problembeschreibung
Transparent or opaque tiny particles appear on the PET extruded sheet surface, affecting appearance and subsequent processing.
Ursachenanalyse
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.
Lösung
Clean screw and barrel to eliminate dead corners; control drying temperature ≤175°C; appropriately increase processing temperature to melt gel particles; use filter screens.
Wichtigste Erkenntnis
PET gel particles originate from impurities, degradation, or excessive drying.
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