1, salt dry method:
Salt-drying method is a combination of curing and drying, that is, curing first and then drying, so that the moisture content in rawhide can be reduced to below 20%. Fresh hides are salted, and the salt solution is gradually concentrated during the drying process, so that bacterial activities are inhibited, and then dried to achieve the purpose of anticorrosion.
The disadvantage of salt drying method is that collagen fiber bundles become shorter and salt particles are formed in the skin during drying, which may affect the natural structure of dermis and reduce the raw material cortex.
2. Pickling method:
Pickling is the most common and reliable method to prevent raw hides from rotting by treating fresh furs with dry salt or brine. Generally, the amount of salt is 20% of the weight of the skin, which is evenly applied to the skin, and then stacked face to face for about 1 week, so that the salt solution gradually penetrates into the skin until the concentration of salt solution inside and outside the skin is balanced, thus achieving the purpose of anticorrosion.
Fur preserved by pickling method is suitable for long-term preservation and is not easy to be eaten by insects.
3. Drying method:
By drying, the moisture content in fresh skin was reduced to 12% ~ 16%, thus inhibiting bacterial reproduction and achieving the purpose of preservation. The optimum drying temperature of fresh skin is 20℃ ~ 30℃, and below 20℃, the water evaporates slowly and the drying time is long, which may make the skin rot.
When the temperature exceeds 30℃, the water on the skin surface will evaporate rapidly, which will easily make the skin surface shrink or collagen gelatinize, prevent the water from evaporating, and become a state of external dryness and internal temperature. Uneven drying will make the skin soak unevenly, which will affect the future processing operation.
4. Drying method:
The dried skin made by this method is called "sweet dried skin" or "light dried skin". When dried in the sun, fresh skin should keep its natural skin shape, with the fur facing down and the skin board facing up. Prevent rain during drying; Don't be exposed to the sun in summer, and don't put it on hot stones or cement boards. In winter, we should prevent freezing and frost. When drying, choose sunny and warm weather. The drying method is simple, low in cost and clean the skin;
Extended data:
The fresh skin peeled off by rabbits is called rawhide before tanning. After degreasing and antisepsis, the rawhide can stand storage, but if it is not stored properly, it may still deteriorate and be eaten by insects, which will reduce the quality of rawhide.
Therefore, attention should be paid to ventilation, heat insulation, moisture-proof, rat-proof, ant-proof and insect-proof during storage, and the piles should be frequently turned over for inspection, generally 2 ~ 3 times a month.
Raw hides are hard, easy to crack, afraid of water, smelly, perishable, not easy to preserve, not beautiful, not suitable for direct use, and must be tanned.
After the rabbit skin is tanned, the leather is soft, moisture-proof, mildew-proof and durable, and can be used to make fur. There are many tanning methods for rabbit skin, such as chrome tanning, alum tanning and formaldehyde tanning. Tanning process is complex and requires certain material and technical conditions, which is not suitable for the processing and production of rabbit farmers in general courtyard.
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