国产成人亚洲午夜电影,亚洲精品无人区在线观看,中文字幕精品一区二区三区无码,国产成人欧美综合在线影院

Polypropylene (PP Polypropylene) is a rising star in the synthetic fiber, scientific name polypropylene fiber. Polypropylene filament production process is simple, there is "one step spinning" "two step spinning." From propylene as a raw material by polymerization, and its raw material modification, melt spinning, spinning melt filtration, hair cooling, winding, the fiber. Compared with the production process of "two-step spinning", "one-step spinning" and "two-step spinning" have the characteristics of less occupation, less personnel and lower cost. The problem is that the strength of the polypropylene filament produced by the "one step spinning" process is low. So its modification of raw materials is quite important, the current use of polypropylene filament manufacturing method. Characterized by the use of melt flow index MFI = 5-40, molecular weight distribution index MWD <7 of polypropylene resin to 400-1600 / min spinning Speed spinning and then towing and twisting in a two-stage traction twister to obtain a high-strength polypropylene filament having a multifilament fineness of 400-1600 dtex.

Polypropylene filament is nearly melted flame, flammable, away from the fire burning slowly and black smoke, yellow flame at the bottom, the bottom of the blue, exudes an oil flavor, ashes after burning hard yellowish brown particles, hand twist fragile. Due to the simple production process, inexpensive products, high strength, the relative density of light advantages. It is now the fourth largest variety of synthetic fibers and is the lightest fiber in common chemical fibers. But poor thermal stability, insensitive to the sun, easy to aging brittle damage, this is often added in polypropylene anti-aging agent.

 Uses: Can be used to knit a variety of knitwear such as hosiery, gloves, knitwear, knitted pants, kitchen towels, mosquito net cloth, Xu Xu, warm packing, wet diapers. Carpets, fishing nets, canvas, hose, concrete reinforcements, etc.