Production & Quality
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PETG product yellowing
Problembeschreibung
PETG transparent products show a pale yellow tone, and transparency and visual quality decline.
Ursachenanalyse
Processing temperature too high (over 260°C) causing thermal degradation and thermal oxidation, material residence time too long, antioxidant insufficient, too much regrind.
Lösung
Strictly control temperature ≤250°C; shorten the molding cycle; add antioxidant formulation; control the regrind ratio ≤20%.
Wichtigste Erkenntnis
PETG yellowing is a manifestation of thermal degradation; temperature and time management is the key to prevention.
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