基于惯性离心力的径向直线拉伸射流纺丝方法

Radial liner stretching jet spinning method using inertial centrifugal force

为提高熔体离心纺丝效率,减小纤维直径,提出了一种直线、径向、无摩擦阻力拉伸射流的离心纺丝方法,并建立了简单的数学理论模型,基于该理论模型确定了纺丝实验设备的关键参数。采用聚丙烯为原料进行间歇式熔体离心纺丝时,在距离离心旋转盘边沿1~2 mm处采集纤维的最大直径范围在6.5~10.5μm之间;根据熔体流量和形成初始射流的喷孔内径,得出纤维细流最大径向速度与旋转盘线速度的偏差小于18%,表明该理论模型是有效的。采用连续生产模式时,在得到聚丙烯纤维平均直径为0.8μm,转速为8 000 r/min的条件下,测得其熔体离心纺丝效率为0.820 g/min。

In order to reduce the fiber diameter and improve melt centrifugal spinning efficiency, this paper presented a centrifugal spinning by linear and radial friction-free stretching of jet. A simple mathematical model of this method was established. The key parameters of the test equipment was determined based on this model. For the melt centrifugal spinning of polypropylene material for test the equipment, the largest diameter of the collected fiber at 1-2 mm distant from the edge of the rotating disk was 6.5-10.5 μm. By the melt flux and the orifice diameter forming the initial jet, the calculated deviation of the instantaneous radial moving maximum speed of jet and rotating disk linear speed is not greater than 18%. It is considered that the theoretical model is effective. When the test equipment is upgraded to continuous production mode, the melt centrifugal spinning efficiency is 0.820 g/min under the conditions of the average diameter of fiber is 0.8 μm and the rotation speed is 8 000 r/min.