A research was established regarding shrinkage of extruded product from pneumatic assisted extrusion forming process, It is studied the major cause are due to molten state film and melting sag.

• 对气辅挤出成型过程中存在的挤出物挤出缩小现象进行了研究，分析认为挤出缩小产生的主要原因是半固态熔膜和熔垂。