Because not considering the shape of products, the position of injection gate and the relation of every factor, orthogonal experiments can not used to predict the shrinkage quantificationally.

• 由于正交实验没有考虑制品的形状和浇口的位置,更没有考虑各个因素之间的耦合关系,所以正交实验方法不能对收缩率进行定量预测。