Processing Machinery
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PVC Embrittlement
Problem Phenomenon
PVC products are brittle and easy to break, failing impact tests
Cause Analysis
Degradation lowers molecular weight, or overpacking causes high internal stress, embrittling products; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Check temperature and residence to rule out degradation; optimize holding pressure; verify with impact tests; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
For embrittlement, check degradation first, then internal stress; 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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