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Material assumes more random molecular structure when cooling.
Artificially balanced runner system - balancing a runner system by adjusting the pressure drop of a long large diameter runner against a short small diameter runner. Since pressure drop over the small diameter runner will be much more affected by heat loss than the large diameter runner, an artificially balanced runner system will work with a set range of molding conditions. The width of this range of molding conditions determines the stability of the molding. Cavity - the interior opening in the mold where the part is formed. Constant pressure gradient - pressure drop per unit length.