Injection Molding
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Tiger Skin Stripes Appearing on the Surface of PBT Injection-Molded Parts
Fenómeno do problema
Alternating light and dark tiger skin stripes appear on the product surface.
Análise das causas
During filling, the melt front alternates between stopping and advancing (slip-stick effect); the low mold temperature causes the melt front to stagnate periodically.
Solução
Increase the mold temperature and melt temperature; increase the injection speed to reduce the filling time; use a larger gate.
Conclusão principal
PBT tiger skin stripes are a manifestation of the slip-stick effect.
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