Polypropylene (PP Polypropylene) is a rising star in synthetic fibers, the scientific name polypropylene fiber. Polypropylene FDY yarn production process is simple, there are "one step spinning" and "two steps spinning". The fiber is prepared by polymerization of propylene, modification of the raw material, spinning of the melt, filtering of the spinning melt, cooling by blowing, winding and winding. Compared with the production process of "one-step spinning", it has the characteristics of less land area, less manpower and low cost. The problem is that the strength of polypropylene filament produced by "one-step spinning" process is low.
Therefore, it is very important to modify its raw materials, and the manufacturing method of polypropylene strong filament is used at present. It is characterized by the use of polypropylene resin with melt flow index MFI=5-40 and molecular weight distribution index MWD<7, spinning at 400-1600/ min speed, and then two-stage traction and twisting in the spindle type traction twister to produce high-strength polypropylene filament with complex filament size of 400-1600 min.
Polypropylene FDY yarn near the flame is melting, flammable, from the fire burning slowly and black smoke, the upper end of the flame yellow, the lower end of the blue, exudes the smell of oil, after burning the ash for a hard round light yellow brown particles, hand twist fragile. Because of the simple production process of polypropylene FDY yarn, the product is cheap, the strength is high, the relative density is light and so on. At present, it is the fourth largest variety of synthetic fibers and the lightest fiber among common chemical fibers. However, the thermal stability is poor, not resistant to sunlight, easy to aging brittle damage, for which anti-aging agents are often added to polypropylene.
Polypropylene FDY yarn use: polypropylene FDY silk can be used to weave a variety of knitwear such as knitted socks, gloves, knitwear, knitted pants, dishwashing cloth, mosquito net cloth, quilt, warm stuffing, diaper wet and so on. Carpet, fishing net, canvas, hose, concrete reinforcement material, etc.
