Material Drying
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COC Moisture Absorption Management Misunderstanding
Problem Phenomenon
COC products occasionally show silver streaks and bubbles; the site completely omits drying management because of COC's low water absorption, and the problem rate rises after opened materials are stored open for a long time.
Cause Analysis
Although COC has extremely low water absorption, environmental moisture and moisture inside the packaging can still adhere to the pellet surface; surface-adhered water is sufficient to form silver streaks during high-temperature processing; open storage also introduces dust contamination.
Solution
①Store pellets sealed after opening, and light dehumidification drying is recommended; ②follow the drying specification in the grade manual; ③cover the hopper to prevent moisture absorption and contamination; ④strengthen incoming inspection in humid seasons.
Key Takeaway
COC's low hygroscopicity does not mean zero moisture management; surface-adhered water alone can cause defects; standardized storage is zero-cost quality insurance.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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