The polypropylene short fiber is mainly used as a production of all kinds of non-woven fabric, composite sheet and spinning. Polypropylene short fibers provide raw materials for automotive interiors, bathroom materials, geotextiles, carpets, filtration, construction and other industries.

   The number of polypropylene short fibers is that the proprigin is lighter than the polypropylene, so that the polyester is larger, the polyester is thick, and the polypropylene single strength is also higher, so the number of drags should be lower than polyester. After the relationship between the stretching process and the intensity is stretched, the fiber intensity is mainly the result of the improvement of fiber degree and crystallinity. In general, with the increase in tensile factor, the strength is increased. The variation of the fiber orientation can be seen from the birefringence of stretching and unretarable filaments. The strength also changes, and the different tensile temperatures can also be changed in the same tensile ratio, and the tensile strength of 16.6 kg of the tensile strength of 30 ° C, the tensile strength of 120 ° C is 21.2 kg, and the tensile strength of 120 ° C is 21.2 kg. Mainly the impact of the crystallinity, the crystallinity of the general winding yarn has been stretched at room temperature, which will reduce the crystallinity. At 120 ° C stretch, the crystallinity will increase to 53%. On the other hand, under the same tensile ratio, the tensile temperature is raised, and the orientation will be lowered. This is due to the shortening of macromolecular relaxation time. Therefore, if only the temperature is increased, the stretching ratio of the polypropylene short fibers does not change, and the fiber performance index cannot be improved.