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Teach you to distinguish the difference between leather and PU stockpiles

On the stock leather leather are generally used to "leather" together, indiscriminately called. In fact, "leather" and "leather" is different, they are both closely linked, there are strict differences. "Skin" refers to the skin of various animals (that is, raw skin), it has undergone a series of physical and chemical processing tanning into a fixed, durable material, known as "leather." Not raw and chemical tanned raw hides, especially hard after drying, but soaked in water and soft, and perishable. After chemical tanning, due to the tanning agent and raw protein fibers in the solid combination of fixed, so that the animal skin has become a soft, tough, water should not be deformed, dry should not shrink, heat resistance, chemical resistance and other properties, And a permeability, permeability and anti-aging and other advantages of the leather. Another striking difference between "skin" and "leather" is that most of the animal skins are soaked in warm water at 40 degrees Celsius and tanned by chrome salt, even in boiling water at 100 degrees Celsius It will not change. Leather has such a performance, in addition to daily leather products, especially leather shoes, but also widely used in industrial production, become a common and indispensable raw materials. The first layer of leather, the first layer of leather, the first layer of leather, cattle body the most surface layer of skin, feel soft fiber quality, strength and tension better breathable performance performance, because the material to fine to avoid scar and wrinkles and more parts The So the first layer of leather products made with the price of leather products than the second floor of the leather products to be high.

The first layer of skin is cattle skin, with grain of cattle, sheep, pigskin, leather surface with natural scars and blood tendons, etc., and occasionally there are processing stab wounds and low utilization of the belly Parts, imports of the first layer of leather and the number of cattle brand. Full grain dough can be distinguished from the thickness of the pores and the density of what kind of animal leather. More types of cowhide, such as dairy cows, beef cattle, grazing cowhide, cow leather, bull leather, unrated castles and castrated bull skins. In our country there are brown leather, buffalo leather, yak leather and leather and so on. Among them, the buffalo skin pores and sparse; yellow leather is more delicate than the buffalo pores. Sheepskin pores are more detailed and more dense and a little slope, mainly sheep and goatskin two major categories. Pigskin nike trainers because of the rules of the long hair is 3 to 5 a small number of distribution, it is easy to distinguish, the general use of artificial feeding pigskin, as well as wild boar, the famous South American wild boar, this wild boar skin has a more obvious Pig skin pores and grain characteristics, due to its special collagen fiber tissue structure, can be processed into a very soft clothing leather or gloves leather, the value is high. In addition, ostrich skin, crocodile skin, short nose crocodile skin, lizard skin, snakeskin, cattle frog skin, sea water skin (with shark skin, cod skin, fish skin, eel skin, pearl skin, etc.), freshwater fish skin There are grass carp, carp skin and other scales skin), with fur fox (silver fox skin, blue fox skin, etc.), wolf skin, dog skin, rabbit skin is easy to identify.

The top layer of skin for the calfskin, grain dough, repair dough, soft dough, (the classification by price classification, high prices in front, low in the back), leather surface with natural scars and blood tendons, etc. occasionally There are processing of the stab wounds and the utilization rate is very low belly parts, the import of the first layer of leather and the number of cattle brand. Full grain dough can be distinguished from the thickness of the pores and the density of what kind of animal leather. More types of cowhide, such as dairy cows, beef cattle, grazing cowhide, cow leather, bull leather, unrated castles and castrated bull skins. In our country there are brown leather, buffalo leather, yak leather and leather and so on. Among them, the buffalo skin pores and sparse; yellow leather is more delicate than the buffalo pores. The first layer of leather is the skin of cattle, the surface has the original skin characteristics, the first layer of skin but also by grade distinction, the best is full grain dough, followed by repair dough, followed by soft dough, the most is the broken skin. Two layers of leather is cut into two layers or even three layers of the cheap nike air max second layer of leather, and later covered kobe shoes with PVC, PU material to re-bond made of leather, suitable for the production of low-grade leather products, fancy very grade, The appearance can be done and the first layer of skin is quite few. Just after use, there cheap nike running shoes is no first layer of leather so weary, resistant to pull, but compared to the PU leather is still much better. From the inside to see the difference between the two feel. Outside the handle can not distinguish.