Type of Defect:  Sink mark

Cause	Countermeasure
Caused by the shrinkage from slow cooling of thick wall section (unsuitable wall thickness)	Reduce thickness deviation
Insufficient injection pressure	Increase injection pressure
Insufficient shot capacity	Increase shot capacity
Mold temperature is too high or insufficient cooling	Increase cooling time if mold temperature is suitable
Insufficient pressure maintained	Extend holding time
Insufficient gate dimension	Increase gate dimension, especially thickness

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Teijin Kasei America, Inc.
Tel: (770) 346-8949