Processing Machinery
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PMMA regrind impurities
Problem Phenomenon
Surface impurities increase in PMMA products mixed with regrind
Cause Analysis
Regrind contains degradation products and contaminant particles, which appear as impurities after molding; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Prohibit regrind in optical parts; sieve regrind to remove impurities; control the mixing ratio; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Regrind impurities are controlled by prohibition and sieving; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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