Polypropylene staple fiber looks like a group of cotton, soft and elastic, polypropylene staple fiber elongation performance is large, easy to control in production, elongation will be 60% longer, in addition to its polypropylene macromolecule itself structural factors, in the production process may also be polypropylene staple fiber tensile insufficient, because of the non-uniformity of the silk, improve the tensile multiple easy winding roll break, Or sometimes pull the foot and then pull back. In production, it is often found that the retraction of the wire between the second and third drawing machine during parking will pull three five rollers to reverse, indicating that after orientation, the internal stress of the fiber is large and there is retraction. These can be improved by intense heat setting or appropriate heat treatment.

Polypropylene staple fiber elongation is too large, will bring a lot of harm, in the blending, the yarn strength also has an impact. The strength difference of yarn after blending was found in spinning, such as the quality index of pure polypropylene 2808, the polypropylene 50% cotton blend index 1950, the polypropylene 50% cotton blend index 2193,215 pure cotton quality index 2336. It can be seen from the above data that pure spun polypropylene yarn is the strongest, far higher than cotton, but after cotton blending, it is not as high as pure cotton, although this situation may be related to the non-uniformity of polypropylene staple fiber and cotton mixing, and it is also related to the difficulty of controlling the extension length of polypropylene staple fiber, so it seems that the simple process is also more testing manufacturers.

Hai'an County Qinfeng Chemical Fiber Co., Ltd. specializes in production and sales：polypropylene staple fiber, Polyester Staple Fiber, functional polypropylene short fiber, functional polyester staple fiber, hydrophilic polyester staple fiber,  polypropylene, PP staple fiber, polyester staple fiber.