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