Material Analysis
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PPS Full Regrind Feasibility
Problem Phenomenon
Attempting high-ratio regrind production, strength retention is unexpectedly good but appearance declines
Cause Analysis
Research shows that after 7 recycling cycles, PPS regrind still retains about 85% of its mechanical properties, and its thermal stability is better than most engineering plastics; but appearance and color deteriorate cycle by cycle, and parts with high appearance requirements still need restricted use
Solution
①The regrind ratio can be relaxed for internal structural parts; ②Appearance parts are still controlled at 25-30%; ③Record cycle counts and conduct performance sampling; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS's regrind tolerance stands out among engineering plastics; the 85% retention rate gives large reuse room for internal parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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