Polypropylene yarn: properties and basic characteristics
The development of modern technologies has led tothe creation of such progressive materials, without which it is already difficult to imagine our life. These include polypropylene yarns, which are especially widely used in the fishing and textile industries.
Such yarns are twisted polymericfibers, which have high strength and durability. The process of producing them is quite complex. Polypropylene is melted, adding the necessary components to improve the properties of the finished product, and forming a film from it, which is cut into strips. The resulting material is wound on special bobbins or spools by the cross method, so that the thread is much easier to slice, without tangling or clinging.
Properties of polypropylene yarns
The high demand for this material is due to the largequantity of its advantages, in comparison with similar at usual threads. Polypropylene yarns are characterized by increased strength, elasticity and minimum bulk density. They are resistant to abrasion, multiple bends, are not exposed to rotting processes, have high resistance to detergents, hot water, and also have antistatic properties. An important fact is that the yarns made of polymer are environmentally friendly material, therefore they do not require any special precautions when working with them. And products from them can safely contact food.
Thanks to chemical inertness, these threads do notcan break down over time. They do not fade, but after manufacturing they can not be painted. The pigment is added to the polypropylene even before the film is made.
Polypropylene yarns must becorrespond to GOST. The mass of produced bobbins averages 5 kilograms, and the density of winding in them varies from 550 to 3500 tex. The strength of the yarns (the ability to resist fracture under load) is measured in the KGS (kilogram of force) and is 1.4-21 KGS.
This thread, which is made by the longitudinalsplitting (fibrilarization). After the formed polymer films are cut into strips (their width is not more than 100 mm), a special adaptation in the form of a needle roller carries out their splitting. For this, longitudinal scratches on the surface of the film are made with it.
After this, the strips are stretched in such a way,so that their length becomes 4-10 times larger, and heat treatment is carried out on the pulling rollers in a special chamber, where the film melts from the high temperature and, as a result, is stretched. Thus, a polypropylene flat filament (or fused) is formed.
A feature of the production of these yarns isuse of special additives, resulting in the resulting material is made very resistant to UV rays. Multifilament yarns are used for the manufacture of such products, which must be particularly resistant to any weather conditions, chemicals, etc.
The spectrum of use of this material is extremelywide. Polypropylene yarns, because of their versatility, have found application in a wide variety of industries. In agriculture, they serve for tying the sheaves and tying up plants. In fishing, they are used for making networks, in the light industry, without this material, the manufacture of carpets and many household things can not do. The threads in the medical industry and in cosmetology are in great demand. Resistant to fading and the effects of detergents, a polypropylene thread is used for loofers, rugs and bright handbags, which are knitted by the skillful hands of modern craftsmen.