综述了聚合物气辅挤出成型过程中影响气垫膜层稳定性的一些因素：工艺参数(气体压力、气体温度、气体流量)、口模结构参数(口模有气辅段长度、环形缝隙)及气阀和挤出螺杆的开启顺序。要使气辅挤出过程中形成稳定的气垫膜层，气体的压力和温度与熔体的压力和温度应接近一致，并应先开启气阀，再打开螺杆进行挤出等。对未来的发展趋势进行了展望。%The research progress of some stability influence factors of gas layer in the gas-assisted extrusion molding process, such as technological parameters(gas pressure,temperature and flow rate),die structure parameters(die length with gas-assisted and gas inlet size)and the turning sequence between gas valve and extrusion screw are summarized. For forming stable gas layer in the gas-assisted extrusion molding process,the gas pressure and temperature should be according with melt pressure and temperature, and extrusion screw turning followed with the gas valve opening when extruding.
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