Pu Leather Detailed Explanation And Application

PU leather detailed explanation and application PU leather detailed explanation and application 1. Simply put, "PU is polyurethane, a kind of artificial leather, which is softer and more expensive than PVC". Secondly, PU is a man-made synthetic material with the texture of real leather, very strong and durable, and inexpensive. For example, CROCODILE bags, only those above 400 are real leather, and those 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. At the same time, it has the advantages of rich colors and various patterns, and the price is cheaper than leather fabrics, so it is popular with consumers. Most people call synthetic leather other than real leather, such as PVC and PU leather, artificial leather or imitation leather. PVC and PU are both polyvinyl chloride (a kind of plastic), but the manufacturing processes of these two products are not exactly the same. In the manufacturing process of PVC leather, the plastic particles must first 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 enter the foaming furnace for foaming, so that it has the softness to adapt to the production of various products and different requirements, and the surface treatment (dyeing, embossing, polishing, matting, grinding and raising, etc., mainly in accordance with the specific product requirements) is carried out at the same time as it comes out of the oven. 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 top of the base fabric, the base fabric can also be included in the middle, so that the existence of the base fabric cannot be seen from the outside. The physical properties of PU leather are better than those of PVC leather. It is resistant to twists and turns, has good softness, high tensile strength, and is breathable (PVC does not have it). The pattern of PVC leather is formed by hot pressing with a steel pattern roller; the pattern of PU leather is first hot-pressed on the surface of the semi-finished leather with a pattern paper, and then the paper leather is separated and surface treated after cooling down. The price of PU leather is more than double that of PVC leather, and the price of some PU leather with 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 it is scrapped; the service life of the pattern roller is long, 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 for lining or non-weight-bearing parts, or for making children's shoes; PU leather can be used for the fabric of footwear or weight-bearing parts. In terms of bags, PVC leather is more suitable. This is because the items in the bag are different from the feet in the shoes, and they will not emit heat; they do not need to bear the weight of the individual. The way to distinguish PU and PVC is relatively easy. From the corners, the base fabric of PU is much thicker than PVC, and there is also a difference in the feel. PU feels softer; PVC feels harder; it can also be burned with fire, and the smell of PU is much lighter than that of PVC. PU is the abbreviation of ployurethane in English, and its chemical Chinese name is polyurethane. Many things use imported PU leather. The reverse side of PU is generally the second layer of cowhide. A special lamination process is used to cover the leather surface with a layer of polyurethane finishing layer to make 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. At the same time, it has the advantages of rich colors and various patterns. It maintains the characteristics of natural leather such as breathability, moisture absorption, softness, wear resistance, and strong comfort. It has the same texture as genuine leather, but it is stronger, more durable and easier to maintain than genuine leather, so it is popular with consumers. With the change of technology, it is also made into various grades of varieties, such as imported second-layer cowhide. Due to its unique technology, stable quality, and novel varieties, it is a high-end leather in the current market, and its price and grade are no less than the first layer of genuine leather. 1. Genuine leather and maintenance 1. What is genuine leather: Genuine leather is the fur of animals, which has not been artificially synthesized, and is generally processed leather. 2. Maintenance of genuine leather: a. Keep it dry and store it in a ventilated and cool place. b. Avoid exposure to the sun, fire, water, sharp objects and contact with chemical solvents. 2. Patent leather and maintenance 1. What is patent leather: Patent leather is made by beating some fragments of genuine 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. In the process of making wrinkled patent leather, the leather body must be softened first, and then painted. Its brightness is no less than that of mirrored patent leather. The wrinkles are like broken tempered glass patterns, the leather body is soft without losing the characteristics of cowhide, and the bags made of it are 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 degree of moisture should not drip water is preferred), or it can be treated with leather cleaner or cleaning cream, but not with brightener. Because brighteners will cause the false coating to fall off and make the shoe surface wrinkled. If the patent leather shoes are scratched, first scrub the scratched part clean, mix egg white with leather oil of the same color, then piece together the scratched part, apply the mixture, and apply it twice more after it dries until the applied part is higher than the surrounding surface. The next day, polish it with a soft cloth until it is flat. 3. Oil leather and maintenance 1. Oil leather is divided into horse oil leather or cow oil leather. Its surface is smooth, and the leather itself has oil penetrating into the leather. It is not easy to mold and produce bacteria. No odor, good hygiene performance, soft feel. Oil leather has the natural texture and delicate feel of ordinary genuine leather, and the appearance is shiny and moisturized, and no oiling is required. It is precisely because of this characteristic that oil leather is very popular this year and has become a common fabric in high-end custom bags. 2. Maintenance of oil leather: Oil leather has the effect of natural wrinkles and discoloration. It is normal for different parts to have different colors. When using it, you should pay attention to waterproofing and anti-fouling. It is recommended to use leather clothing or sofa cleaners to take care of it. It is particularly worth mentioning that even if there are scratches on the oil cowhide, 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: It is artificial leather Artificial leather: It is a mixture of resin raw materials and other additives, and a material similar to natural leather obtained after certain processing. The most widely used resin raw materials are polyvinyl chloride (PVC) and polyurethane (PU). Therefore, the main varieties of artificial leather are: PVC artificial leather (polyvinyl chloride (PVC for short) artificial leather), PU artificial leather (polyurethane (PU for short) artificial leather) 1. PVC leather and maintenance PVC artificial leather: PVC is made by calendering and compounding with plasticizers and other additives on cloth. The advantages are low price, rich colors and various patterns. The disadvantages are poor air permeability, poor flexibility due to hardening at low temperatures, cracking and poor slip resistance. 2. PU leather and maintenance When PU is matched with leather, the second layer of cowhide is generally used on the reverse side, and then a layer of PU resin is coated on the surface, so it is also called film cowhide. It is relatively cheap and has a high utilization rate. With the change of technology, it is also made into various grades. For example, imported second-layer cowhide is currently a high-end leather due to its unique technology, stable quality, and novel varieties. The price and grade are no less than the first layer of genuine leather. Based on environmentalism, PU leather has the texture of genuine leather, is very strong and durable, and is inexpensive. Abroad, due to the influence of animal protection associations and the development of technology, the performance and application of PU synthetic leather have exceeded 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, which has nothing to do with the material. It may be genuine leather or not. Patent leather refers to a process of pouring paint on materials such as genuine leather or PU leather. Its characteristics are bright color, natural, waterproof, moisture-proof, not easy to deform/easy to clean and maintain. Since the process of patent leather is relatively complicated and the requirements are very high, the price of patent leather products sold in the market is also relatively high. Now many unethical merchants in the market often sell bright leather as patent leather. In fact, there is a big difference between patent leather and bright leather. Bright leather is actually the leather material that is colored and then polished to make the product more beautiful. Although it also has a certain degree of moisture resistance, its feel is still not as good as patent leather, and the luster of patent leather material is very natural. PU is artificial leather, not real leather. Simply put, "PU is polyurethane, a kind of artificial leather". Secondly, PU is a man-made synthetic material with the texture of real leather, very strong and durable, and low price.