Material Drying
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POM surface streaks/silver streaks
Problem Phenomenon
Streaks and silver streaks on the product surface.
Cause Analysis
Excessively long melt residence causes degradation or trace moisture; although POM has low moisture absorption, both water content and degradation produce surface streaks.
Solution
①Lower the temperature and clean the barrel; ②pre-dry at 80℃ if necessary; ③shorten residence time; ④check regrind.
Key Takeaway
For POM silver streaks, check degradation first, then moisture.
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