Detailed explanation and application of pu leather

1. To put it simply, “PU is polyurethane, a type of artificial leather, which is softer and more expensive than PVC.” Secondly, PU is an artificial synthetic material that has the texture of genuine leather, is very strong and durable, and is cheap. For example, for CROCODILE bags, only those priced above 400 are genuine leather, and those priced below are PU leather.

2. PU synthetic leather is used to replace PVC artificial leather, and its price is higher than PVC artificial leather. In terms of chemical structure, it is closer to leather fabrics. It does not use plasticizers to achieve soft properties, so it will not become hard or brittle. It also has the advantages of rich colors and various patterns, and is cheaper than leather fabrics. So it is welcomed by consumers.

Most people refer to synthetic leathers other than genuine leather, such as PVC and PU leather, as artificial leather or imitation leather. PVC and PU are both polyvinyl chloride (a type of plastic), but the manufacturing processes of these two products are different.
During the manufacturing process of PVC leather, plastic particles must be hot-melted and stirred into a paste, and then evenly coated on the T/C knitted fabric base according to the specified thickness, and then entered into a foaming furnace for foaming to make it adaptable We produce various products with different softness requirements, and perform surface treatment (dying, embossing, polishing, matting, grinding and fluffing, etc., mainly in accordance with specific product requirements) when they are released.

The manufacturing process of PU leather is more complicated than that of PVC leather. Since the base fabric of PU is a canvas PU material with good tensile strength, in addition to being coated on the base fabric, the base fabric can also be included in the middle to make it There is no base fabric visible from the outside. The physical properties of PU leather are better than PVC leather, including resistance to bending, good softness, high tensile strength, and breathability (not available in PVC). The pattern of PVC leather is hot-pressed by a steel pattern roller; the pattern of PU leather is hot-pasted on the surface of the semi-finished leather with a pattern paper, and then the paper leather is separated after it cools down to make the surface. deal with. The price of PU leather is more than double that of PVC leather, and the price of PU leather with certain special requirements is 2-3 times higher than that of PVC leather. Generally, the pattern paper required for PU leather can only be used 4-5 times before being scrapped; the pattern roller has a long service life, so the cost of PU leather is higher than that of PVC leather.
There are also certain differences in the scope of application of these two materials. In terms of footwear, PVC leather is mostly used in linings or non-weight-bearing parts, or in the manufacture of children’s shoes; PU leather can be applied to footwear fabrics or weight-bearing parts. In terms of bags, PVC leather is more suitable. This is because the items in the bag, unlike your feet in shoes, do not emit heat and do not bear your own weight.

The difference between PU and PVC is relatively easy. From the corners, the base fabric of PU is much thicker than that of PVC. There is also a difference in feel. PU feels softer; PVC feels harder; you can also use fire to burn it. The smell is much lighter than that of PVC.
PU is the abbreviation of English polyurethane. The chemical name in Chinese is polyurethane. Many things are made of imported PU leather. The back of PU is usually the second layer of cowhide. A special lamination process is used to make the leather surface covered with a layer of polyurethane decoration. The surface layer is made of PU transfer leather. In terms of chemical structure, it is closer to leather fabric. It does not use plasticizers to achieve softness, so it will not become hard or brittle. It also has the advantages of rich colors and various patterns, and it maintains the breathability of natural leather. , moisture absorption, softness, wear resistance, and strong comfort. It has the same texture as real leather, but is stronger, more durable and easier to maintain than real leather, so it is very popular among consumers. With the change of technology, it has also been made into various grades, such as imported second-layer cowhide. Due to its unique technology, stable quality, novel varieties and other characteristics, it is a high-end leather in the current market, and its price and grade are no less than first-layer genuine leather.

1. Genuine leather and maintenance
1. What is genuine leather: Genuine leather is animal fur. It has not been artificially synthesized and is generally processed leather.
2. Maintenance of genuine leather:
a. Keep dry and store in a ventilated and cool place.
b. Avoid exposure, fire, washing, impact with sharp objects and contact with chemical solvents.

2. Patent leather and maintenance
1. What is patent leather: Patent leather is made by beating some scraps of real leather into pulp and then making it into leather. It has a strong plastic feel and a smooth appearance. Wrinkled patent leather is currently widely used. Its advantages are: good hand feel and soft leather body. During the production process of wrinkled patent leather, the leather body must first be softened and then sprayed with paint. Its brightness is no less than mirrored patent leather. The wrinkles are like broken tempered glass patterns, and the leather body is soft without losing the characteristics of cowhide, making the bag very comfortable.
2. Maintenance of patent leather: The dust on the surface of patent leather shoes can be wiped gently on the shoes with a clean wet cloth (the wetness level is preferably not dripping). You can also use leather cleaner or cleaning paste to clean it, but do not use brightener. Take care of. Because the brightener will cause the false coating to fall off, it will make the shoe upper wrinkled. If the patent leather shoes are scratched, first scrub the scratched area clean, mix egg white and leather oil of the same color, then put the scratched areas together, apply the mixture, and apply it two more times after drying until the painted area is larger than the surrounding area. If the surface is high, polish with a soft cloth until smooth the next day.

3. Oily skin and maintenance
1. Oily leather is divided into horse oil leather or butter leather. Its surface is smooth and the cortex itself has oil penetrated into the skin.Inside the material, it is not easy to get moldy or produce bacteria. No odor, good hygienic performance and soft to the touch. Oil skin has the natural texture and delicate feel of ordinary genuine leather. It has a shiny and moist appearance and does not require oiling. Officially because of this characteristic, oil leather is very popular this year and has become a commonly used fabric in haute couture bags.
2. Maintenance of oily skin: Oily skin has natural wrinkles and discoloration effects. It is normal for different parts of the skin to have different colors. Pay attention to waterproofing and anti-fouling when using it. It is recommended to use leather clothing or sofa cleaner to take care of it. It is particularly worth mentioning that even if there are scratches on the oiled cowhide leather, there is no need to worry. Just wipe the scratches with a soft cloth and they will disappear. If you find that the color of the bag has become lighter, you need to oil it. Do not use various bags to wipe the oil, just wipe it with a dry cloth.

4. Imitation leather and maintenance
Imitation leather: artificial leather
Artificial leather: It is a mixture of resin raw materials and other additives, which is a material similar to natural leather obtained after certain processing. The most widely used resin raw materials at present are polyvinyl chloride (PVC) and polyurethane (PU).
Therefore, the main varieties of artificial leather are: PVC artificial leather (polyvinyl chloride (PVC) artificial leather), PU artificial leather (polyurethane (PU) artificial leather)

1. PVC leather and maintenance
PVC artificial leather: PVC plus plasticizers and other additives are calendered and compounded on cloth.
The advantages are cheap price, rich colors and various patterns.
The disadvantages are poor air permeability, hardening at low temperatures, resulting in poor flexibility, cracks and poor slip resistance.

2. PU leather and maintenance
When PU is matched with leather, the second layer of cowhide is usually used on the back, and then a layer of PU resin is applied on the surface, so it is also called film cowhide. Its price is cheaper and its utilization rate is high. With changes in technology, it has also been made into various grades, such as imported second-layer cowhide. Due to its unique technology, stable quality, and novel varieties, it is currently a high-end leather, and its price and grade are no less than first-layer genuine leather. Based on environmentalism, PU leather has the texture of real leather, is very strong and durable, and is cheap. In foreign countries, due to the influence of animal protection associations and the development of technology, the performance and application range of PU synthetic leather exceed that of natural leather.
Maintenance of PU leather: PU leather shoes are best wiped with detergent + paper (do not use corrosive detergents).

“Patent leather” refers to a processing technology and has nothing to do with the material. It may be genuine leather, or it may not be genuine leather.
Patent leather refers to a process of spraying paint on materials such as genuine leather or PU leather. It is characterized by bright and natural color, waterproof and moisture-proof, not easy to deform/easy to clean and care for. Because the process of patent leather is relatively complex and the requirements are very high, the price of patent leather products sold on the market is correspondingly higher. Many unscrupulous merchants on the market now often sell bright leather as patent leather. In fact, patent leather and bright leather are very different. Bright leather is actually the leather that is colored and then polished to make the product more beautiful. Although it is also It has a certain degree of moisture resistance, but its feel is still not as good as patent leather, and the luster of patent leather is very natural, while PU is artificial leather, not real leather. Simply put, “PU is polyurethane, a type of artificial leather.” Secondly, PU is an artificial synthetic material that has the texture of genuine leather, is very strong and durable, and is cheap.

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