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when plastic is heated and melted in the barrel it expands then the heated plastic fills and packs the cavity here is the part we just molded now weamp;#39;ll cut away the part and show what happens to the plastic inside when the plastic cools the outside surfaces cool and freeze first this sets up a shell of rigid plastic but the plastic inside is still hot as the part continues to cool the molecules inside move closer together the plastic shrinks and this causes an internal stress that tries to collapse the surface of the molded part