Material Drying
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Gel Particles in PCTG Extruded Sheets
Fenómeno do problema
Visible particles (gel particles) appear in PCTG extruded sheets, with poor appearance.
Análise das causas
High-melting-point impurities or cross-linked gel are mixed into the raw material, the material stays too long in the screw dead corners and degrades, and the drying temperature is too high, producing prepolymers.
Solução
Use 80-120μm filter screens; optimize the screw combination; control the drying temperature ≤70°C; clean the screw regularly.
Conclusão principal
PCTG gel particles originate from impurities and degradation products.
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