Injection Molding
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PC Flow Marks
Problem Phenomenon
[Problem Phenomenon] Wavy flow marks on the PC surface
Cause Analysis
The front cold film ruptures; PC's high viscosity, low mold temperature and slow injection speed aggravate it; when troubleshooting on site, verify each item according to this mechanism one by one, and avoid blindly adjusting the machine based on experience alone; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Increase the mold temperature and melt temperature; multi-stage injection optimization; enlarge the runner and gate; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate effective measures
Key Takeaway
For PC flow marks, raise the temperature and stabilize the speed; high viscosity is the internal cause; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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