How to estimate process conditions? Yuyao Yunpeng Mould

The first step is predicting the shrinkage is to estimate the pressure and temperature of the polymer melt from the mold geometry and expected machine set-points.Since the exact pressure and temperature are not known beforehand,the mold designer may assume that the melt temperature is equal to the mid-range temperature recommended from the material supplier.The melt pressure is more difficult to predict since the molder will adjust the filling and packing pressures to address a variety of needs(including shrinkage).However, a common molding practice is that the packing pressure is initially set to 80% of the pressure required to filled the mold.

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