The polypropylene fiber of the scientific name is melted and flammable in the near flame. It burns slowly and emits black smoke from the fire. The upper end of the flame is yellow, the lower end is blue, and the oil smell is emitted. After burning, the ash is hard round, light yellow and brown particles, and the handcuffs are brittle. .
It is a fiber obtained by polymerization and melt spinning of propylene as a raw material. Polypropylene officially began industrial production in 1957, and is a rising star in synthetic fiber. Because polypropylene has the advantages of simple production process, low price, high strength and light relative density, polypropylene has developed rapidly. At present, polypropylene is the fourth largest variety of synthetic fibers and the lightest fiber among common chemical fibers.
The physical and mechanical properties of the fiber are: high strength (4-6 g/denier short fiber, 5-8 g/denier filament), wet strength and dry strength are basically the same, specific gravity is small (0.91), wear resistance Corrosion, etc. The annual production of polypropylene fiber in the world has exceeded 1 million tons in 1980.
Polypropylene varieties include filaments (including undeformed filaments and expanded filaments), short fibers, silk, and split fibers (the polypropylene is first formed into a film, and then the film is stretched to split it into original Hollow fibers, shaped fibers, various composite fibers, and non-woven fabrics.
Civil use: It can be used for purely spinning or blending with wool, cotton or viscose to make various kinds of fabrics. Can be used to weave a variety of knitwear such as hosiery, gloves, sweaters, knit pants, dish cloth, mosquito net cloth, wadding, warm filler, wet diapers, etc.
Industrial use: carpets, fishing nets, canvas, hose, concrete reinforcement, industrial fabrics, non-woven fabrics, etc. Such as carpets, industrial filter cloth, ropes, fishing nets, building reinforcements, oil absorbing blankets and decorative fabrics. In addition, polypropylene film fibers can be used as packaging materials.