注塑变形问题诊断 徐昌煜 Charles Hsu 2010 年4 月20 日于上海亚龙 国际 酒店半结晶塑料的收缩率较高，这些塑料因在平行和垂直于 熔胶流动方向有着不同的收缩率，使得问题变得复杂。 这问题又因工艺条件改变致使结晶度变化而更形复杂。 如果塑料冷却得慢，结晶度和收缩率都会增加。 The semi-crystalline plastics has higher mold shrinkage factors. These materials have the additional problem of different shrinkage factors parallel to and perpendicular to the direction of melt flow. This problem is further compounded by variations in the degree of crystallinity caused by changes in molding conditions. If the material is cooled slowly
