热效应，压力，零件的几何形状，和流动方向会引起不均匀的体积收缩率。具体介绍如下。
1。1。热效应
温度的首先影响聚合物加工后的体积变化。如PVT所示（图1），注塑件从周围高温中冷却的具体体积按恒定压力变化，引起高收缩率。在薄壁成型中，进入空腔的熔融聚合物的腔表面能量耗散，能快速冷却。因此，靠近模具表面的聚合物温度比靠近聚合物中心的温度低，能产生一个相对较低的收缩率。所以，厚的部分比薄的部分收缩的多。因此，具有不均匀厚度的注射成型件，会产生非均匀收缩及相应的翘曲。
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