Processing Machinery
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PP Material Batch Switching
Problem Phenomenon
[Problem Phenomenon] Process window drifts after switching PP batches/suppliers
Cause Analysis
Differences in MFI and molecular weight distribution between batches affect flow; different suppliers have different grade systems requiring recalibration; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Quick MFI check for batch changes; re-trial the mold for supplier changes; incoming inspection linked with the process; after adjustment, take continuous samples 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
For PP material change, quick-check MFI first; recalibrate for supplier changes; 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 future problems
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