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[How does the elongation property of polypropylene staple fiber affect production?]
Release date:[2021/7/27] Read a total of[198]time

The polypropylene staple fiber looks like a ball of cotton, soft and elastic. The polypropylene staple fiber has a large elongation performance, and it is easy to control poorly in production. The elongation will be over 60% longer, except for its polypropylene macromolecules. In addition to its own structural factors, the polypropylene staple fiber may not be stretched enough during the production process, because of the large unevenness of the yarn, the increase in the stretching ratio may cause the roll to break, or sometimes it will retract after pulling the foot. In production, it is often found that the retraction of the filaments between the second and the third drawing machine when the machine is stopped will pull the three and five rolls backwards, indicating that after the orientation, the internal stress of the fiber is very large and there is shrinkage. These can be improved by intense heat setting or proper heat treatment.

       Excessive elongation of polypropylene staple fiber will bring many harms. In blending, it will also affect the yarn strength. It has been found in spinning that the strength of the yarn after blending is poor, such as the quality index of pure polypropylene is 2808, the index of polypropylene 50% cotton blending is 1950, the index of polypropylene 50% cotton blending is 2193, and the quality index of pure cotton is 2336. It can be seen from the above data that pure spun polypropylene yarn has the highest strength, much higher than cotton, but after blending with cotton, it is not as high as pure cotton. Although this situation may be related to the unevenness of polypropylene staple fiber and cotton, it is also related to polypropylene. It is related to the difficulty of controlling the elongation of short fibers, so the seemingly simple process is also a test for manufacturers.

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