Polypropylene has good processing properties, and like general thermoplastic resins, it can be molded using methods such as injection molding, extrusion molding, blow molding, and spinning. It can also be welded, hot formed, electroplated, and foamed, and can be subjected to secondary processing when needed. Containers, pipes, plates, films, flat wires, fibers, bottles, and various injection molded parts can be made. Polypropylene has good flowability, high softening point, and low enthalpy, so the molding cycle is shorter than most thermoplastic plastics, and drying is not necessary before processing. The molding method has a certain relationship with the melt flow rate (MFR) of different products and selected resins.

The process of producing polypropylene short fibers may seem simple and convenient, but in reality, if there is a slight mistake in operation, it can have a significant impact on the finished product, such as the problem of excessive elongation of polypropylene short fibers. May I ask if the process of polypropylene short fiber is really as simple as what you see?

Excessive elongation of polypropylene short fibers can cause many hazards. And in blending, it also has an impact on the yarn strength.

In spinning, it has been found that the strength of the blended yarn is poor, such as the quality index of pure polypropylene fiber 2808, the quality index of polypropylene 50% cotton blended yarn 1950, and the quality index of polypropylene 50% cotton blended yarn 2193215. The quality index of pure cotton 2336. From the above data, it can be seen that pure polypropylene yarn has a higher strength, much higher than cotton, but when mixed with cotton, it is not as high as pure cotton. Although this situation may be related to the non-uniformity in the mixing of polypropylene short fibers with cotton, it is also related to the difficulty in controlling the elongation of polypropylene short fibers. Therefore, the seemingly simple process is also a test for manufacturers.

The appearance of polypropylene short fibers looks like a lump of cotton, soft and elastic to a certain extent. The elongation performance of polypropylene short fibers is relatively high, and they are easy to control poorly in production, with elongation exceeding 60%. This is not only due to the structural factors of the polypropylene macromolecules themselves, but also due to insufficient stretching during the production process.

Due to the large unevenness of the silk, increasing the stretching ratio can easily cause the roller to break, or sometimes retract after stretching enough. During production, it is often found that the retraction of the wire between the second and third stretching machines during parking causes the three and five rollers to reverse, indicating that after orientation, the internal stress of the fibers is high and there is retraction. These can be improved by intense heat setting or appropriate heat treatment.

Hubei Botao Synthetic Fiber Co., Ltd. was established in October 2000, specializing in the production and sales of polypropylene, polyester, composite fibers, and polylactic acid short fibers. The products are mainly used in industries such as non-woven fabrics, automotive interiors, geotextiles, carpets, and filtration. The company is located in Jingmen City, Hubei Province, and currently has six branches, covering a total area of 300000 square meters. The company is equipped with an imported fiber production line, with fixed assets exceeding 100 million yuan. It produces 50000 tons of polypropylene short fibers, 20000 tons of polyester short fibers, and 10000 tons of composite fibers annually, with an annual output value exceeding 500 million yuan.

The company adheres to technological innovation as the foundation, introduces new technological talents, cooperates with universities and colleges to develop and create a high-end Botao brand. The polypropylene short fibers used for automotive interiors and high-speed rail geotextiles that closely follow market demand have filled the market gap. The company currently has over 280 employees, including 8 engineers and more than 30 other technical personnel. With strong technical strength, it has a strict quality inspection system and independent research and development, production, and marketing capabilities,