Thermoforming
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Fisheye gel particles in PET extruded sheet
Problembeschreibung
Fisheye-like protrusions formed by high-molecular gels appear on the PET sheet surface, and holes appear during '2079851475616104458.
Ursachenanalyse
Some PET molecules stay in the screw high-temperature zone for a long time, producing crosslinked oxidized gels; raw material contains high-melting particles not fully melted.
Lösung
Optimize screw configuration to reduce shear heat; control extrusion temperature ≤285°C; use melt filter 40-60μm; regularly clean the system.
Wichtigste Erkenntnis
PET fisheyes seriously affect '2079851475616104458 quality; system cleanliness and temperature control are fundamental.
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