Several kinds of leather commonly used for manufacturing safety shoes

Genuine Leather

The leather is raw hides peeled off by cows, sheep, pigs, horses, deer, or some other animals. After being tanning and processing in a leather factory, the leather is made of leather material with various characteristics, strengths, feels, colors, patterns, and is a modern leather product. The necessary materials. Among them, cowhide, sheepskin and pigskin are the three major skin types used as raw materials for leather making. The dermis is divided into the first layer of skin and the second layer of skin.

(1) The top layer of the skin is cattle, sheep, pigskin, etc. with a grain surface. There are natural scars and blood marks on the surface of the skin. Occasionally, there are knife wounds in the processing process and the intestines where the utilization rate is extremely low. Imported skins and cows are also numbered. Full grain hides can be distinguished from animal skins by the size and density of the pores. There are many types of leather, such as cowskin, beef cattle, grazing cows, cowskins, bullskins, uncut bulls, and castrated bulls. In China, there are yellow leather, buffalo leather, yak skin and yak skin. Among them, buffalo hides have coarser and more sparse pores; yellow leather has finer and denser pores than buffalo hides. The pores of sheepskin are finer, denser, and slightly slanted. There are mainly two types of sheep skin and goat skin. The rule of long-haired pigskin is the distribution of 3 to 5 roots and a small beak, so it is easy to distinguish, generally using artificially raised pig skins, as well as wild pigskin. The famous is the South American wild boar. This wild boar skin has obvious Pork skin pores and grain features, due to its special collagen fiber structure, can be processed into a very soft garment leather or gloves leather, a high value. In addition, ostrich skin, crocodile skin, short-nose crocodile skin, lizard skin, snakeskin, bullfrog skin, saltwater fish skin (having shark skin, eel skin, eel skin, eel skin, pearl skin, etc.), freshwater skin ( There are scales such as grass carp and squid skin, hairy foxes (silver foxes, blue foxes, etc.), wolf skins, dog skins, and rabbit skins, etc., which are easily recognizable and cannot be made into second skin.

The first layer of skin is directly processed from the raw skin of various animals, or the skin of cattle, pigs, horses, etc. in the thicker skin is cross-sectioned into upper and lower layers. The upper part of the tightly fibrous tissue is processed into various heads. Layer skin.

(2) The second layer of skin is the second layer of loose fibrous tissue, which is coated with chemical materials or coated with pvc and pu films.

Therefore, an effective method for differentiating between the scalp skin and the bilayer skin is to observe the longitudinal section fiber density of the skin. The first layer of skin is composed of a dense and thin layer of fibers and a slightly loose overlayer that is closely associated with it, and has good strength, elasticity, and process plasticity. The second layer of skin has only a loose fibrous tissue layer, and can only be used to make leather products after spraying chemical raw materials or polishing. It maintains a certain natural elasticity and process plasticity characteristics, but its strength is poor, and its thickness requires the same layer. Like skin. There are also various kinds of leather used in the current popular production, and the leather processing process is somewhat different, but the method of differentiation is the same.

Recycled leather

Reconstituted hides are crushed from various animal skins and leather trimmings and processed with chemical materials. The surface processing technology is the same as the leather trimming and embossing leather. Its characteristic is that the edge of the skin is more neat, the utilization rate is high, and the price is cheap; however, the skin is generally thicker and the strength is poor, and it is only suitable for making an affordable document case and a drawbar bag. The styling process products, such as the club cover and the flat-price belt, are uniform in the longitudinal section fibrous structure, and can recognize the coagulation effect of the liquid substance mixed fiber.

Leatherette

Recycled leather, also known as imitation leather or rubber, is a general term for artificial materials such as pvc and pu. It is made on the basis of textile or non-woven fabrics, and is made of various formulas such as pvc and pu foaming or laminating processing. It can be based on different strength, wear resistance, cold resistance and color, luster, and pattern. Patterns and other requirements for processing, with a variety of colors, waterproof performance, neat trim, high utilization and cheaper than the price of leather, but most of the artificial leather, its feel and flexibility can not achieve the effect of leather; its vertical Cut surface, you can see the fine bubble hole, cloth or surface film and dry dry man-made fibers. It is a type of material that has been very popular since the early days and is widely used to make leather products, or parts of leather materials. Its increasingly advanced production technology is being widely used in the processing of two-layer leather.

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