Processing Machinery
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PPS product bubbles (degradation)
Problem Phenomenon
Bubbles increase after overheating.
Cause Analysis
PPS degrades at high temperature and produces gas; excessive residence accelerates it.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
①Control the upper temperature limit; ②shorten residence; ③clean the barrel; ④monitor actual temperature.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Distinguish bubbles from moisture versus degradation; PPS degradation temperature must be strictly guarded against.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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