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Registered: ‎12-20-2010

Guidelines for Fill time of painted plastic parts

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08-22-2012 08:06 AM



I'm writing today to see if anyone can help with guidelines for gate sizing of plastic parts that will be painted post-molding. I remember during my training and professional experience that you need to fill plastic parts that will be painted later more slowly than normal. I was always told that a maximum bulk shear rate of 15,000s-1 was the preferred limit for such a case (painting or plating). However, I have never seen any publications/liturature to support or disprove this threshold.


I'm sure like all things there are different levels for different materials, but I'm wondering what other use for a guideline.


Any thoughts out there?





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