The results show that the apparent density of hard elastic polypropylene increases with a lower melt temperature, or a higher draftratio, or a higher air blasting speed.
结果表明，熔体温度下降、所受拉伸比增加或冷却风速度升高均可使表观密度增加。
2
The results show that the maximum porosity of the membrane with distributing uniformly pore diameter are increased with the lowering spinning temperature, and increasing melt draftratio.
结果表明，聚丙烯熔体的温度较低、所受拉伸比较大，所形成的微孔膜孔径分布均匀、孔隙率较高。
3
The effects of rotor speed, draftratio and twist factor on the properties of elastic rotor-spun yarns were investigated, and the technology optimizing was done through the orthogonal test.