Vegetable tanned leather is the raw material of leather processed with vegetable tanning agent. In terms of hardness and softness, there are chrome tanned leather, semi-vegetable tanned leather and whole vegetable tanned leather. Tanned skin of all plants is the hardest and thickest. General vegetable tanning is the best choice for primary color leather goods and leather carving. Vegetable tanned sheepskin is sheepskin made by this process, usually sheepskin.

It has real environmental protection characteristics. And feel hard. This is a leather process.

Vegetable tanning is a pure plant preparation, which is much lower in price than vegetable tanning, causing cancer and higher in price. This kind of leather is more environmentally friendly. Chrome tanned leather is rich and bright in color, but it is not environmentally friendly, contains no chromium, and feels soft, but the color is limited. After oxidation, it will become hexavalent chromium, which is still in the research and development stage.

From the grade of leather: full grain leather > half grain dough > light cut dough > reprocessed dough?

From the soft and hard points of leather: chrome tanning >; Semi-vegetable tanned leather > whole vegetable tanned leather (baked leather)

From the style and practice of leather, it can be divided into wax leather, water dyed leather, textured leather, Napa leather, wax leather, embossed leather, trimmed leather, patent leather, ground fur, paste leather, printed leather, cracked leather and suede leather.

Dermal: Dermal is divided into two layers: the first layer and the second layer. ?

The first layer of skin refers to the skin of cattle, sheep and pigs with grain surface (dermis layer), which has natural and special grain surface effect. The second skin has no dermis, but fibrous tissue (reticular layer), which is treated by spraying chemical materials or covering PVC and PU films. Therefore, an effective way to distinguish the first skin from the second skin is to observe the fiber density on the longitudinal section of the skin. The first layer is composed of dense and thin dermis and a slightly loose reticular layer closely connected with it, which has good strength, elasticity and process plasticity.

Regenerated leather: also known as bran paper abroad. It is made by grinding the waste skins and dander of various animals and mixing them with chemical raw materials. Its surface processing technology is the same as leather trimming and embossed leather, which is characterized by neat edges, high utilization rate and low price. However, the leather body is generally thick and the strength is poor, so it is only suitable for making cheap briefcase, trolley bag, club cover and other shaped products and cheap belts. The fiber structure in the longitudinal section is uniform, and the solidification effect of fluid mixed fiber can be recognized. ?

Artificial leather: also called imitation leather or rubber compound, it is the general name of artificial materials such as PVC and PU. It is formed by foaming or laminating PVC and PU with different formulations on textile fabric or non-woven fabric. It can be made according to different requirements of strength, wear resistance, cold resistance, color, luster and pattern. It has the characteristics of various colors, good waterproof performance, neat edge width, high utilization rate and lower price than real leather, but most artificial leather can not reach the effect of real leather in hand feel and elasticity. In its longitudinal section, fine bubble holes, cloth base or surface film and dry man-made fibers can be seen.