Proper cooling is an essential requirement in order to preserve the initial molecular
orientation achieved during the mold filling stage. The importance of proper cooling can
never be overstated, although coolant channel layout is frequently a secondary concern
and depends on the amount of space left over in the tool after knock-out pins and other
mold components have been designed. Ideally, cooling channels should run parallel
and as close as possible to both sides of the binge (see Figure 4) to reduce the effect of
shear heat buildup at the hinge land.