Our air drawing model of polymers in the melt blowing process in verified by the experimental results obtained with our universiyty's cquipment. The predicted liber diamcters tally well with the experimental data. The effects of the processing parameters on the liber diameters are further investigated in this paper. We find that a lower polymer flow rate, a higher initial polymer temperature, a higher initial air velocity, and higher polymer melt flow index can all procuce finer fibers, while the effect of the initial air temperature is insignificant. The results reveal the great potential of this research for computer assisted design of the blowing technology.

The air permeability of airbag fabrics was measured at high pressure differentity up to 200 kPa, It was found that permeability varied with pressure differential nonlineariy. The relationship between air permeability and the pressure differential was fitted well with power law curve. The study revealed that the coefficient c and exponent b in the power law equation had a strong correlation with porosity, which was chosen to characterize the airbag fabrics.

介绍了转杯纺纱机纺复合纱的原理，对FA601型转杯纺纱实验机进行改造纺制了棉氨纶包芯纱。经成纱性能测试与成纱结构电镜照片分析，转杯纺包芯纱质量指标达到纺织行业标准的技术要求，成纱中氨纶丝与短纤纱相互交缠呈股线状。

研究了聚合物熔体在衣架型模头中的等温流动。采用幂律模型描述该熔体的流变行为，通过三雏有限元方法对此流动进行模拟，从而得到其速度场的分布情况，并且着重讨论了衣架型模头的几何形状对速度场分布的影响，特别是对出口宽度方向速度均匀性的影响。

An approach based on the shock tube experiment is proposed to evaluate the permeability of airbag fabrics Shock tube experiments are conducted to imitate airbag inflation by fixing the airbag fabric sample near the end of open driven section When a plane shock wave impinges the airbag fabric, it will be reflected Meanwhile, an increased pressure formed at the front face of the airbag fabric will lead to a flow through the fabric due to the permeable structure of airbag fabrics The air permeability of airbag fabrics is thus determined by measuring the velocity of reflected shock wave It is found that at relatively high pressure the dynamic permeability resulted from shock tube experiment is lower than the static ones resulted from the conventional permeability testing method This phenomenon is supposed relevant to the different influences on the airbag fabric structure of steady pressurizing happened in static experiments and instantaneous pressurizing happened in shock tube experiments