Material Drying
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Gel Particles in PCTG Extruded Sheets
Problem Phenomenon
Visible particles (gel particles) appear in PCTG extruded sheets, with poor appearance.
Cause Analysis
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.
Solution
Use 80-120μm filter screens; optimize the screw combination; control the drying temperature ≤70°C; clean the screw regularly.
Key Takeaway
PCTG gel particles originate from impurities and degradation products.
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