中文摘要：

气辅共挤成型是一种新型的聚合物挤出成型技术，其实质是将气辅挤出技术应用于共挤成型技术，发挥气辅挤出和共挤成型的优点。文章介绍了气辅挤出成型技术的机理、发展历史和研究现状，论述了气辅共挤成型工艺的研究现状和发展前景，最后简述了气辅共挤成型的机理和研究现状。

英文摘要：

Gas-assisted co-extrusion molding is a new multiphase-polymer molding technique. The basic mechanism is that the gas-assisted extrusion is applied to the polymer co-extrusion, which will exert the advantages of both gas-assisted extrusion and co-extrusion. In this paper, the mechanism and actual states of gas-assisted extrusion are presented. The process of available gas-assisted co-extrusion technological is discussed. At last,the mechanism and the actual states of gas-assisted co-extrusion are introduced.