Material Drying
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Silver Streaks in PCTG Injection Molded Products
Fenómeno do problema
Silver or white fine streaks appear on the surface of PCTG products.
Análise das causas
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.
Solução
Fully dry to moisture <0.03%; increase the back pressure to 0.5-1.0MPa for venting; reduce the barrel temperature.
Conclusão principal
PCTG silver streaks mainly originate from moisture and gas.
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