Material Drying
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PPS Silver Streaks and Bubbles
Problem Phenomenon
Silver streaks and tiny bubbles appear on the part surface; improvement is obvious after drying but not complete
Cause Analysis
The main cause of PPS silver streaks and bubbles is surface moisture; residue after drying indicates a second cause: melt overheating decomposition gas, regrind contamination, or mold moisture; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Verify that the drying procedure is properly executed; ②Investigate melt temperature and retention; ③Check regrind cleanliness and mold water circuits; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Troubleshoot PPS silver streaks along three paths: moisture, overheating, and contamination; when drying works but is incomplete, immediately turn to the latter two; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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