According to the purpose, it is divided into leather for life, leather for national defense, leather for Industry and agriculture, and leather for cultural and sports goods; According to the tanning methods, it can be divided into chrome tanned leather, vegetable tanned leather, oil tanned leather, aldehyde tanned leather and combination tanned leather. In addition, it can be divided into light leather and heavy leather. Leather commonly used for vamp, clothing, gloves, etc. is called light leather, measured by area; The leather that is tanned by plant tanning agent or combination with thicker animal skin and used for the inner and outer soles of leather shoes and industrial accessories is called heavy leather, which is measured by weight.

According to animal types, there are mainly pig leather, cattle leather, sheep leather, horse leather, donkey leather and kangaroo leather, and a small amount of fish leather, reptile leather, amphibian leather, ostrich leather, etc. Among them, cattle leather is divided into cattle leather, buffalo leather, yak leather and yak leather; Sheepskin leather is divided into sheep leather and goat leather.

According to the layers, there are two layers of leather, the first layer of leather includes full grain leather and shaving leather; The two-layer leather also includes pig two-layer leather and cow two-layer leather. Among the main types of leather, cattle leather and sheep leather have flat and fine surface, small wool eyes, fine and compact internal structure, good fullness and elasticity, and good physical properties. Therefore, high-grade cattle leather and sheep leather are generally used as leather materials for * products, and their prices are higher among the bulk leather.

According to leather and leather: leather "leather" is a common word in the leather products market, and it is a customary term for people to distinguish synthetic leather from natural leather. In the concept of consumers, "genuine leather" also has a non fake meaning. Animal leather is a kind of natural leather, that is, what we often call genuine leather. It is a leather material with various characteristics, strength, hand feel, color and pattern made from animal (raw hide) after tanning and processing in a leather factory. It is a necessary material for modern leather products.

The processing process of leather animal leather is very complicated. It needs to go through dozens of processes to make the finished leather: raw leather -- soaking -- meat removal -- degreasing -- depilation -- alkali soaking -- Expansion -- deashing -- softening -- pickling -- tanning -- sectioning -- shaving -- retanning -- neutralization -- dyeing -- oiling -- filling -- drying -- finishing -- finishing -- finished leather. There are also many kinds of leather. According to the materials, sheep leather, cattle leather, horse leather, snake leather, pig leather and crocodile leather are commonly used. According to the properties, they can be divided into two-layer leather, full grain leather, suede leather, modified leather, film coated leather, composite leather and decorative split leather.

Among them, cowhide, sheepskin and pigskin are the three major kinds of raw materials used in leather making.

Regenerated skin is made by mixing chemical raw materials after crushing various animal skins and leather scraps. Its surface processing technology is the same as that of leather shaving leather and embossed leather. It is characterized by neat edges, high utilization rate and low price; However, the leather body is generally thick and has poor strength, so it is only suitable for the production of fixed process products such as affordable briefcases, pull rod bags, club covers and affordable belts. The fiber structure of the longitudinal section is uniform and consistent, and the solidification effect of the mixed fiber of the fluid can be recognized.

Artificial leather artificial leather is also called imitation leather or rubber, which is the general name of PVC, PU and other artificial materials. It is made on the textile fabric base or non-woven fabric base by foaming or laminating PVC and Pu with different formulations. It can be processed according to the requirements of different strength, wear resistance, cold resistance, color, luster, pattern pattern, etc. it has the characteristics of a wide variety of designs and colors, good waterproof performance, neat edges, high utilization rate and low price compared with real leather.

Artificial leather is a kind of material which is very popular from early to now, and is widely used to make various leather products or some leather materials. Its increasingly advanced manufacturing technology is widely used in the processing and manufacturing of two-layer leather. Nowadays, the artificial leather with the characteristics of very similar to real leather is available for production. Its surface technology and the fiber structure of the base material almost reach the effect of real leather, and its price is comparable to that of the domestic top layer leather.

Synthetic leather synthetic leather is a plastic product that simulates the composition and structure of natural leather and can be used as its substitute material. The surface is mainly polyurethane, and the base material is non-woven fabric made of synthetic fibers such as polyester, cotton and polypropylene. Its front and back are very similar to leather, and have certain permeability. It is characterized by beautiful luster, not easy to mold and moth, and is closer to natural leather than ordinary artificial leather.

There are many kinds of synthetic leather. In addition to the common characteristics of synthetic fiber non-woven fabric base and polyurethane microporous surface layer, various synthetic leathers have different non-woven fabric fiber varieties and processing technologies. Synthetic leather has smooth surface, uniform color and strength, and is superior to natural leather in terms of water resistance, acid and alkali resistance and microorganism..