After the shear rate,pressure,drop,and gate freeze time have been calculated for an initial design,the type and dimensions of the injection mould gate can be modified to improve the design.For aesthetic and de-gating purposes,smaller gate sizes are desired.As the previous examples have shown,however,excessive shear rates may dictate the use of larger gate sizes.These shear rate calculations are dependent upon an assumed flow rate,and this flow rate will not be known until after the molder has optimized the process with the implemented mold. For this reason,the plastic injection mold designer should assume a reasonable flow rate for analysis,select a type of gate that can be enlarged, and specify dimensions that are “steel safe”.In this way, the size of the gates can be readily increased to reduce shear rates as needed.

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