Injection Molding
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Tiger Skin Stripes Appearing on the Surface of PBT Injection-Molded Parts
Problem Phenomenon
Alternating light and dark tiger skin stripes appear on the product surface.
Cause Analysis
During filling, the melt front alternates between stopping and advancing (slip-stick effect); the low mold temperature causes the melt front to stagnate periodically.
Solution
Increase the mold temperature and melt temperature; increase the injection speed to reduce the filling time; use a larger gate.
Key Takeaway
PBT tiger skin stripes are a manifestation of the slip-stick effect.
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