Injection Molding
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PP Flow Mark
Problem Phenomenon
【Problem Phenomenon】Wavy flow marks on PP surface
Cause Analysis
The cold solidified film at the front breaks; low mold temperature and slow injection speed; PP rapid solidification aggravates it; 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
Increase mold temperature and melt temperature; multi-stage injection optimization; enlarge runners and gates; 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 flow marks increase temperature and stabilize speed, rapid solidification is the internal cause; 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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