Material Drying
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PPS low water absorption still needs drying
Problem Phenomenon
PPS products show mottling and poor gloss on the surface, occasional nozzle drooling, and reduced product toughness
Cause Analysis
PPS moisture absorption rate is only about 0.05%, the main problem is water attached to the pellet surface rather than internal water absorption; surface moisture vaporizes in the 320℃ melt, degrading surface quality and aggravating nozzle drooling and brittleness
Solution
①Hot air drying 140℃×3-5 hours or dehumidifying drying 120℃×2-3 hours; ②use up within 2 hours after drying; ③fix the drying process for high appearance requirement parts
Key Takeaway
The goal of PPS drying is surface water rather than deep water; 140℃×3-5h hot air or 120℃ dehumidifying, drying overtime brings no extra benefit; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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