Specify Vent Dimension of Plastic Injection Mold

Once the number of plastic injection mould vents is specified,the rate of air flow through each vent can be calculated.It may seem reasonable to estimate the air flow through each vent as the total volumetric air flow divide by the number of vents.However,this approach would not be conservative.The reason of inejction molding is that the exact location of the end of fill is not known.As such,it is possible that much of the air flow can disproportionately favor any one of the four locations on each side of the part.A more conservative approach is to assume that all the local air flow exits through each available vent.

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