Jiangsu Sisi Yuan Polypropylene Fiber: Meticulous craftsmanship, outstanding quality!

In the vast world of chemical fibers, it occupies an important position with its unique properties. Jiangsu Sisiyuan Fiber Co., Ltd. specializes in the production of polypropylene fibers. With advanced technology and strict processes, it presents high-quality products to the market.

Jiangsu Sisiyuan Fiber Co., Ltd. is located in a provincial economic development zone with beautiful scenery on the coast of the Yellow Sea. Relying on well-known domestic research institutes, it is a leading enterprise in the Jiangsu coastal engineering fiber industrial cluster, possessing profound technical heritage and innovative strength.

Polypropylene fiber, commercially known as "Binglun" in China, is spun from isotactic polypropylene obtained through the polymerization of propylene. Jiangsu Sisi Yuan is extremely strict in the selection of raw materials, carefully choosing polypropylene resin with high purity and isotropy ranging from 97% to 98%. The average molecular weight of the resin is between 180,000 and 300,000, and the crystallinity exceeds 65%, laying a solid foundation for the high performance of the products.

During the production process, the company adopts the advanced melt spinning method. First, feed the polypropylene resin into a vertical or horizontal screw extruder. Due to the high melt viscosity and poor fluidity of fiber-forming polypropylene, the screw compression ratio is large, with the minimum reaching 2.8, the metering section is short, and the length-to-diameter ratio is between 20 and 26. At a high temperature of 260-300 ℃, the resin is heated and melted. Through a precise metering pump, it is extruded by a spinneret to form a fine stream of melt. Due to the rapid crystallization rate of polypropylene fibers during cooling and molding, the cooling temperature is slightly lower. Generally, the side blowing air speed is 0.1-0.3m /s, and the air temperature is 12-16 ℃, ensuring that the melt fine flow cools and solidifies rapidly into filaments.

The initial filament has low strength and needs to be stretched. Sisi Yuan Company precisely controls the stretching temperature, speed and force, making the fiber molecular chains highly oriented and significantly enhancing the strength and modulus. The stretched fibers are then heat-set to eliminate internal stress, stabilize the structure, and further enhance dimensional stability and physical properties.

The polypropylene fibers produced by Sisi Yuan have outstanding performance. With a density of only 0.90-0.92g/cm³, it is the lightest among chemical fibers, 20% lighter than nylon and 30% lighter than polyester. It has obvious advantages in weight-sensitive application scenarios. It has excellent strength. The strength of common short fibers is 35-53 CN /tex, and that of high-strength fibers can reach 75cN/tex. Moreover, it has extremely low moisture absorption. The dry and wet strengths are nearly the same as the elongation at break. When stretched by 3%, the elastic recovery rate is 96-100%. It is resistant to repeated bending and has a long service life. It can withstand 200,000 deflections at a fracture Angle of 175°. Meanwhile, this fiber has excellent chemical resistance. It is stable to most acids and alkalis except concentrated nitric acid and concentrated caustic soda, and is suitable for use in chemical filtration, packaging and other fields.

In addition, the company has also conducted research and development on the modification of polypropylene fibers to achieve specialization, endowing them with functions such as flame retardancy, UV resistance, antibacterial properties, and antistatic properties. The linear density of fine polypropylene fiber monofilaments is less than 1dtex. The fabric made from it has a soft hand feel, a unique core absorption effect, and is moisture-wicking, breathable and smooth.

With these properties, the polypropylene fibers of Jiangsu Sisi Yuan are widely used. In the field of construction, as a reinforcing fiber for concrete, it effectively controls cracks, enhances the crack resistance, impermeability and impact resistance of concrete, and is used in the construction of expressways, Bridges, tunnels, etc. In industry, it can be used to manufacture ropes, fishing nets, filter cloths, etc., meeting the requirements of high strength and corrosion resistance. In the field of clothing and home textiles, it is blended with other fibers to take advantage of its light weight and quick-drying properties, and is used to produce winter clothing fillers, sportswear, etc.

Jiangsu Sisiyuan Fiber Co., Ltd. continuously optimizes and innovates the production process of polypropylene fibers, providing reliable materials for various industries and promoting the in-depth application and development of polypropylene fibers in multiple fields.