Material Drying
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Silver Streaks in PCTG Injection Molded Products
Problem Phenomenon
Silver or white fine streaks appear on the surface of PCTG products.
Cause Analysis
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.
Solution
Fully dry to moisture <0.03%; increase the back pressure to 0.5-1.0MPa for venting; reduce the barrel temperature.
Key Takeaway
PCTG silver streaks mainly originate from moisture and gas.
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