Anti-corrosion: The fresh skin peeled by slaughter contains a lot of water, protein, bacteria and various enzymes. If it is not handled properly in time, it is easy to deteriorate, leading to rot, depilation, loss of processing value and abandonment.
The antiseptic treatment of fresh skin is to clean the skin first: cut off the fresh skin (also called blood skin), cut off the polluted parts such as head and tail, carefully scrape off the muscles, fat and connective tissue left on the skin (don't hurt the skin), and treat it in time by drying or salting.
Insect-proof: The fresh skin should be treated with insect-proof in time, otherwise the board skin will be easily eaten by insects during storage, which will make the skin lose its processing value. The specific method is to spray pesticides on the fur surface of the skin.
Cosmetic surgery: the cosmetic surgery of fresh skin directly affects its grade. The same piece of skin will be upgraded if it is reshaped, otherwise it will be downgraded. Plastic surgery is to properly open the skin into a rectangle, and don't wrinkle any part of the skin plate; Rough surfaces should be as clean and pollution-free as possible.
There are two ways to treat fresh skin systematically:
(1) drying method: drying method is the simplest method to reduce the moisture in the skin, thus preventing bacteria from moving and achieving the purpose of preservation. The dried skin made by this method is called sweet dried skin or light dried skin. The specific operation is as follows: firstly, apply or spray pesticides (any pesticide that can kill arthropods) on the skinned skin (rough surface) to prevent various insects from invading and polluting the skin. Then use bamboo or wooden bow to spread out the leather cover (hair inward) and put it in a cool, dry and ventilated place to dry quickly. You can also cut it from the belly line, arrange it in a rectangle, and stick it on cardboard to dry in the shade (nail it firmly). During plastic surgery, don't stretch or widen your hair too hard, which will lead to hair thinning and uneven thickness. Try to stick it flat. In the drying process, avoid exposure to the hot sun to prevent the leather board from cracking or being soaked by melted residual fat. It is strictly forbidden to overlap the leather surface with the wool surface. Prevent manual cutting of leather boards.
(2) Pickling method: This method is widely used, especially when peeling in high temperature and high humidity seasons or regions. Its mechanism is that salt can create hypertonic environment, expel skin moisture and inhibit the growth and reproduction of bacteria, thus achieving the purpose of anticorrosion. Its advantages are strong corrosion resistance, simple operation, avoiding the adhesion and fracture of rabbit skin fiber in the drying process, not easy to rot after being wetted, and less moth-eaten loss during storage. Its disadvantage is that in the process of salt skin drying, collagen fiber bundles become shorter and salt particles remain in the skin, which has certain influence on the natural structure of dermis. The specific method is: soak fresh skin in 40%-50% salt solution for a few days, or apply 100% salt on the surface of fresh skin, shake off the salt after a few days, drain the salt water, arrange and finalize the design, put it in a cool, dry and ventilated place to dry, or directly use it for processing.