- Issue Time
- Oct 30,2017
Gate dimensions are often adjusted to improve the dimensional control of plastic injection molding.When the gate solidification time is significantly less than the packing time required by the melt in the cavity,then excessive volumetric shrinkage may occur,There are two common approaches that are used to reduce the volumetric shrinkage.The most common approach used by the molder is to impose a very high packing pressure before the gate freezes, such that the residual melt pressure in the cavity will be relieved as the melt shrinks.Unfortunately,this approach can lead to excessive flashing and/or residual stresses.For this reason,a second common approach is to increase the diameter or thickness of the gate to increase the solidification time and provide packing at more moderate melt pressures.A third and seldom used approach is to rework the plastic injection mold to reduce the nominal thickness of the molding.
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