Material Drying
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PSU Wet Material Defects Can Be Recycled
Problem Phenomenon
[Problem Phenomenon] PSU products with insufficient drying are judged as scrap due to poor appearance; material waste is large
Cause Analysis
PSU is hydrolytically stable; wet material processing only produces appearance defects (silver streaks, bubbles, flow marks) without degrading molecular chains; the official source clarifies that such defective products can be crushed, re-dried and re-molded without performance loss
Solution
Collect and crush wet-material defective products separately, reuse after full drying; manage separately from thermally degraded material (degraded material cannot be reused); verify moisture content meets standard before reuse; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU wet-material scrap is false scrap; re-molding after drying causes no performance loss, except for degraded material; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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