How to deal with animal fur

The first is the classification and rough machining of rawhide. Leather with tanning value is classified according to the thickness of leather board, whether it is residual leather or not, and whether it is new leather board. Then remove the skin pieces with no economic value (such as head, legs, claws, tail, big meat, etc.). ) to reduce space occupied by the next process.

Second, water is softened. This process is mainly aimed at stale or partially dried skin pieces. Soak it in water to make it close to fresh skin.

Third, degreasing. This process is to remove oil stains from leather sheets, and degreasing is best carried out in warm water. This degreasing process must be clean, which will directly affect the quality of all subsequent processes.

Fourth, go to the meat. Is to remove the excess meat on the leather board except the dermis. The key of the process is to clean the meat without damaging the skin board.

Fifth, further degreasing. This process is mainly aimed at oily skin, and some vegetarians with small oil can omit this process as appropriate. At this time, it is best to do it in warm water, and the degreasing time should not be too long.

Sixth, to meat, to thin. This process is aimed at some skin with thick dermis, which cannot be removed in the process of meat removal. Through this processing, the leather board can reach the required thickness.

Seven, enzyme softening. Through enzyme catalysis, the leather board is further refreshed, the fiber matrix is further removed, the oil inside the leather board is decomposed, and the leather fiber is loose, which creates conditions for tanning.

Eight, pickling. The purpose of this process is to further loosen leather fibers and create suitable PH value for some tanning processes.

Nine, tanning. This is the main process, in which the leather board can fully absorb tanning agent, making the leather board loose, soft, good in shrinkage and high in adhesive strength. There are many tanning methods, each with its own characteristics and effects.

Ten, washing. At this time, the water should be washed quickly, so that the purpose can be achieved by washing away the excess chemicals in the peeling board and wool.

Eleven, fatliquoring. Because the grease in the leather board has been removed in the previous process, the leather board will become rough after drying without stretching, so it is necessary to add some fatliquoring agent to promote the stretching of the leather board without corroding it, so as to increase the flexibility of the leather board.

Twelve, finishing the process. Through shoveling, rotating cage, rotating drum, stretching and other work, the leather pieces are sorted and bundled into storage.

Extended data:

Tanning process (alum tanning method):

The ratio of material to liquid is 4-5: 1, (when wet tare weight 1, tanning liquid is 4-5). Put it into a container, so that the fur is fully soaked in the feed liquid. In order to make the feed liquid evenly penetrate into the cortex, it should be fully stirred (preferably with a roller), stirred once a day after overnight for about 30 minutes each time, and soaked for 7- 10 days to finish tanning.

Judge whether tanning is completed, take out the soaked skin, with the skin board facing outward and the plush folded inward, and press the water at the corner hard. If the folded part is white and unclear, just like tissue paper, it proves that tanning is over. The low water temperature during tanning not only prolongs the tanning time, but also hardens the cortex. It is best to keep the temperature at about 30℃. After tanning, don't wash the inner surface with water, just wash the rough surface with water. Alum tanned fur is white and soft, but it lacks water resistance and heat resistance.

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