Material Drying
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PSU Surface Impurities
Problem Phenomenon
Impurity spots and off-color particles appear on the surface of PSU products, especially obvious on transparent parts; they improve briefly after purging but recur intermittently.
Cause Analysis
Excessive barrel temperature causes melt overheating and decomposition; long melt residence time causes decomposition; impurities mixed in during raw '2079851475616104451 or unclean containers; accumulated material in dead spots intermittently falls off.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Solution
①Appropriately lower barrel temperature; ②Clean the barrel promptly to remove dead spots; ③Purify raw materials and containers; ④Thoroughly remove retained decomposed material during discontinuous production.
Key Takeaway
Tracing PSU surface impurities covers three links: temperature, equipment, and raw materials; the intermittent characteristic points to material accumulated in dead spots; raw material cleanliness management cannot be ignored.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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