Injection Molding
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Flow marks/water wave marks on product surface
Problem Phenomenon
Concentric circular or arc-shaped ripples appear on the surface, spreading like water waves, with irregular distribution
Cause Analysis
The melt flow front temperature is too low, causing repeated solidification and re-melting; the injection speed curve fluctuates; mold temperature is too low
Solution
Increase melt temperature by 5-15°C and mold temperature; use a slow-fast-slow three-stage injection speed curve; enlarge gate size
Key Takeaway
Flow marks reflect the unstable state of melt front filling
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