Priklevanie. At this stage, the skins are placed in an acid environment, so as chrome tanning agents and not soluble in alkaline conditions. The process is piklevaniya preservative, and in this state, the skins can be stored for a long time, without incurring damage. Tanning. Raw skins collagen fibers have become a stable product that will no longer be susceptible to rotting. Placed in a drum skin, which adds chrome and tannins.
After tanning the skin's much improved. It becomes more elastic, wear-and heat-resistant. Now the material can be added innumerable times, without fear of damaging it in the folds, frequently wet and dry. Of skin to be removed excess moisture. This is done through passing the material between two rollers, similar to those that are available on the presses belya.Rasscheplenie.
Now need to split the skin to the desired thickness. The average thickness of the unsplit skin about 5 mm. The thickness of the leather Upholstery – 1.9-2mm. The skin is passed through a special mechanism. First, remove the top face of the skin. Then cut one and sometimes two layers. These layers are called the layers of the skin. Leveling. The thickness of the skin should be the same over the entire area of the material. This is done by a special machine, which is forced through the skin. Spiral Blade perfectly align the overall thickness of fiber structure, and purified for better absorption followed by chemical treatment. Repeated dublenie.Etot process is intended to skin a special purpose, which is processed further tanning chemicals.