Injection Molding
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Premature Gate Freezing in PBT '2079851475616104452
Fenómeno del problema
The gate solidifies before the end of holding, and the shrinkage compensation channel is cut off, causing sink marks.
Análisis de la causa
The gate size is too small or the mold temperature in the gate area is too low, causing PBT to crystallize and solidify rapidly.
Solución
Increase the gate diameter to ≥50% of the product wall thickness; increase the mold temperature in the gate area; delay the holding switchover.
Conclusión clave
Premature PBT gate freezing seriously affects the shrinkage compensation effect.
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