Sheepskin stripping and primary processing technology

(a) slaughter and skinning. Most of the goats and sheep slaughtered were traditionally slaughtered using the "large wiped neck." This method tends to make blood contaminated fur, but also affect the integrity of the sheep's skin and reduce the quality of the skin. The better way to slaughter the sheep is to fix the sheep and cut the skin longitudinally with a knife in the neck of the sheep. The incision is about 7-10 cm. Then the knife is inserted into the incision and the trachea and blood vessels are cut off to draw the blood out. , Or pull the trachea and blood vessels out of the skin to prevent blood contamination of the skin. After the blood was drained, the body temperature of the flea was immediately stripped. Stripping should not be done with a knife or air blow, because knife peeling is easy to damage the skin, air blow is harmful to people who blow, it is best to use the following method: Place the sheep on clean clean board, use a sharp knife to open the cortex in the belly line. Then proceed along the midline of the chest and pick it up to the lip of the lower jaw, and then pick it back and pick it back to the anus along the midline; then from the inside of the two forelimbs and the two hind legs, open the two horizontal lines and reach the hoof between the hoofs and the vertical line perpendicular to the thorax and abdomen. Then peel the skin along the chest and abdomen with the knife and peel it inwards by about 5cm. Hold your chest and abdomen and open the skin with your hands. Use your fist to hit the meat and pull it. This will quickly peel the entire sheepskin. under. (b) plastic surgery. The peeled skin is scraped with a blunt knife to remove the shavings, fat, clotting, and impurities from the skin. Be careful not to scratch the skin and keep the fur intact. Then remove the lips, ears, hooves, coccyx, and skin edges that do not form well. Finally, in accordance with the natural shape of the skin and the stretching properties, all parts of the skin are flatly stretched to make the skin smooth and square. (c) Antiseptic treatment. Raw skin is mainly composed of collagen fibers, containing protein, fat, and moisture, and is particularly prone to bacterial growth, decomposition, and spoilage. For this reason, antiseptic treatment must be done in time. At present, there are two kinds of antisepsis, drying and salting. 1, dry method. It is to dry fresh skin to a moisture content of 12% to 16%, creating environmental conditions that are not conducive to bacterial growth and reproduction, and to the goal of preservation. The specific approach is: First, the raw skin hair shuffling, skin plate down, hair facing up, according to the natural shape stretched limbs, tiled on the wood or attached to the wall, be careful not to excessive support, until the skin plate shape after the exposing Next, place the board upside down and dry it in a cool, ventilated place. During the drying process, it is necessary to prevent sunlight exposure, prevent freezing, and prevent humans and animals from trampling. 2, salted method. This method can inhibit bacterial growth as soon as possible, protect the inherent quality of sheepskin, no lint, no corruption, can make the skin long-term preservation. There are two specific ways: First, dry pickling method. Is the salt surface evenly sprinkled on the surface of the fresh skin, the use of salt is about 35% -50% of fresh skin weight, so that the salt fully absorb water, and gradually penetrate into the skin. Sprinkle the fresh skin of the salt, the surface of the skin is opposite, and piling it into small pots, pickling it for 2-3 days and then pulling it to dry. The second is the water-curing method. Prepare 25% salt solution in water or in a container. The temperature of the salt solution should be controlled at about 15°C. Put the fresh skin into it and let it soak for 16-26 hours. Take the sheepskin out and place it on a rope or wooden pole to allow it to dribble freely. After rinsing the water, sprinkle 20%-25% dry salt on the skin and dry. (d) storage and storage. The sheepskins that have been air-dried by the above-mentioned treatment are to be well-matched to the boards and hairs to the wool ground, and are bundled for every 10 to 20 sheets, and then bundled with thin ropes for stocking or sale. In order to ensure the quality of fur and prevent dust from falling in, it can be covered with plastic sheets, etc. If necessary, insect repellents such as hygienic balls or fine naphthalene powder should be added to prevent the fur from becoming insects. At the same time, we must pay attention to ventilation, prevent rat damage, and prevent mildew.