The appearance of polypropylene short fiber seems to be a cotton, soft and has a certain elasticity, and the elongation of polypropylene short fibers is large. It is easy to control in production, and the elongation will exceed 60%, which except for its polypropylene macromolecule. In addition to the structural factor, it may also be insufficient in the production process, because the wire is unevenness, improve the tensile ratio is easy to wrap the roller, or sometimes retransmond. The retreat between the second stage and the third stretching machine is often found in the production, and three five rollers are reversed. After the orientation, the fiber stress is large, and there is a retreat. These can be improved by tension heat setting or proper heat treatment.

        Dellarous short fiber elongation is too large, it will bring a lot of harm, in the blend, there is also an effect on the strength of the yarn. Spinning has been found in the spinning, such as pure polypropylene quality indicators 2808, polypropylene 50% cotton blend indicator 1950, polypropylene 50% cotton blend index 2193, 215 cotton quality index 2336. It can be seen from the above data, the strength of the pure splicing grate is the highest, which is much higher than the cotton, but it is not as good as the cotton, which may be related to the unevenness of the polypropylene short fiber and cotton mixture, also with polypropylene The polypropylene short fiber is difficult to control the length, so it seems to be more than a relatively simple process.