Material Drying
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Silver Streaks in PCTG Injection Molded Products
Fenómeno del problema
Silver or white fine streaks appear on the surface of PCTG products.
Análisis de la causa
The raw material moisture content is high (>0.05%), and the water vaporizes during processing to produce silver streaks; the back pressure is insufficient and the barrel contains air.
Solución
Fully dry to moisture <0.03%; increase the back pressure to 0.5-1.0MPa for venting; reduce the barrel temperature.
Conclusión clave
PCTG silver streaks mainly originate from moisture and gas.
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