Environment-friendly leather-producing process by using sturgeon skins

Abstract

The invention relates to a leather-producing process, and specifically relates to an environment-friendly leather-producing process by using waste sturgeon skins in a food processing process of artificially cultured sturgeons. The leather-producing process comprises the following steps of 1) group batching the sturgeon skins; 2) washing; 3) soaking; 4) liming; 5) washing; 6) deliming; 7) bating; 8) washing; 9) pickling; 10) neutralizing; 11) oxidation bleaching; 12) reduction bleaching; 13) washing; 14) dealkalizing; 15) washing: washing the dealkalized sturgeon skins with water; 16) repeat pickling; 17) tanning; 18) re-tanning; 19) drying; 20) trimming; 21) buffing; 22) solvent degreasing; 23), spin-drying; 24), drying; 25), rewetting; 26), re-tanning; 27), dyeing; 28) drying; 29) buffing; 30) finishing: spraying a coating agent on the buffed leather to obtain sturgeon leather. The sturgeon leather produced by the process has the advantages of softness, fullness, non-harsh handfeel and fine grains. The process is environment-friendly.

Description

technical field [0001] The invention relates to a leather production process, which is an environment-friendly tanning process for preparing sturgeon leather from discarded sturgeon skin during the food processing process of artificially cultured sturgeon. Background technique [0002] The sturgeon skin used in this technology is a kind of fresh sturgeon skin (or salt wet skin) discarded when large-area (or factory) artificially cultured sturgeon is used as food processing raw material. [0003] Sturgeon is a rare and valuable fish, and every part of its body has commercial value. Sturgeon skin is usually peeled from the belly, so you get two sides, one leather side and the other meat side. Its leather surface is very unique, such as figure 1 As shown, the color distribution of the leather surface is that the color of the part near the back is closer to black, and the part near the belly is closer to white or yellow. There are 5 rows of irregular hard scales, and some spe...

AI Technical Summary

Problems solved by technology

[0006] Although the leather obtained by the traditional process of sturgeon leather tanning described in the CN102199676B patent is soft, the fish leather obtained by this process has not been ground, and the result will be very rough and difficult to be practical; and the oxidative bleaching immediately after softening is likely to cause The reason for the rotten surface is that there are enzyme residues after softening, and a large amount of skin protein will be decomposed in the alkaline environment of oxidative bleaching; this process requires manual flesh removal and oil film scraping, which is not only time-consuming but may eventually leave grease residue ; The most important thing is that the process is not environmentally friendly and will cause great harm to the environment

[0007] Although the leather obtained by the environmental protection process of sturgeon leather tanning described in the CN102199675B patent is soft and has good physical properties, the process actually has the pollution problem of sulfide and lime; it is difficult to realize large-scale operation through multiple manual defleshing operations, and finally It is not necessarily possible to remove the oil completely; without polishing process, the obtained leather is very rough; softening after bleaching will make it difficult to observe slight changes in the skin surface of the sturgeon during the softening process; drying in the air will lead to uneven leather

[0008] The sturgeon leather obtained by the fish skin tanning process described in the CN1710111A patent not only cannot protect the scales, but also needs to be descaled, losing the most valuable part of the sturgeon skin, so it cannot be called a good process

[0009] The painting of sturgeon skin and its production method described in the CN1836920B patent proposes a better leather-making process of sturgeon skin. The finally obtained sturgeon leather is soft and feels good, but it uses the traditional chrome tanning process, which does not belong to Environmental protection technology, the most important thing is that it cannot protect the color of the sturgeon skin hard scale itself

[0010] CN102154529B discloses a method for making leather from sturgeon skin. Although the process is simple to operate, the acid softening of sturgeon scales may not be complete, and there is a lack of liming process, and the fiber dispersion is not enough. The final leather is likely to be relatively hard.

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