Processing Machinery
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PP Material Change Cleaning
Problem Phenomenon
[Problem Phenomenon] Off-color and black specks after PP material/color change; incomplete cleaning
Cause Analysis
Material and color changes require thorough cleaning; PP can use PE or dedicated purging compound; double for dark-to-light changes; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Use PE or purging compound replacement for color changes; double for dark-to-light; synchronize the hot runner; 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
Thorough cleaning for PP material changes; double for dark-to-light; 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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