Material Drying
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TPE silver streaks dominated by moisture
Problem Phenomenon
Radial silver streaks on the surface of TPE products, with no obvious improvement after adjusting injection parameters
Cause Analysis
The vast majority of TPE silver streaks are caused by moisture: water vapor expands sharply during mold filling and breaks through the surface layer; 0.1% moisture is visible on transparent or light-colored parts; machine adjustment offers no solution and drying is the only way out
Solution
①check drying first: dew point and moisture content actually measured up to standard; ②check hopper moisture regain; ③consider other causes only after moisture is ruled out; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For TPE silver streaks, suspect drying first; the 0.1% red line plus an insulated hopper can eliminate 95% of silver streaks; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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