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The Difference Between Pu And Pvc Phone Case

The Difference Between Pu And Pvc Phone Case

2019-08-14

The top layer of PVC is lacquer, the main component in the middle is polyvinyl chloride, and the lowermost layer is back-coated adhesive.

PU is commonly known as synthetic leather and has lighter weight. The texture of the PU is a paper grain, which is a process in which the PU pulp is coated on the grain-form release paper, and the paper is peeled off after cooling and setting, thereby leaving the paper grain on the PU layer.

PU can also be processed and embossed. There are two kinds of wet and dry methods in terms of the production process. The two are extremely easy to distinguish. The wet method is generally thicker because there is a layer of the BASE (low foaming layer) between the top layer and the base fabric, while the dry method has no BASE and is directly applied to the bottom of the cloth, so the texture is easily deformed.

Wet PU has a wide range of uses, including bags, handbags, shoes, balls, stationery, sofas, etc., while dry methods are mainly used in packaging and clothing.

 PinJun Electronic-The Difference Between Pu And Pvc Phone Case, Guangzhou Pinjun Electronic Co

Most people will refer to synthetic leathers other than leather, such as PVC leather and PU leather, as artificial leather or imitation leather. PVC and PU are all polyvinyl chloride (a kind of plastic), but the manufacturing process of these two products is not the same.

In the manufacturing process, the PVC leather is firstly melted into a paste by hot melt, and uniformly coated on the base of the T/C knitted fabric according to the specified thickness, and then foamed in the foaming furnace to make it adaptable. Produce a variety of different products, different requirements of softness, surface treatment at the same time of the release (dyeing, embossing, polishing, matting, grinding and raising, etc., mainly in accordance with specific product requirements).

PU leather is more complicated in the manufacturing process than PVC leather. Since the base fabric of PU is a canvas material with good tensile strength, in addition to being coated on the top of the base fabric, the base fabric can be included in the middle to make it The appearance does not see the presence of the cloth. The physical properties of PU leather are better than those of PVC leather. It is resistant to tortuosity, softness, tensile strength and gas permeability (no PVC). The pattern of the PVC leather is made by hot pressing of a steel pattern roll; the pattern of the PU leather is pressed on the surface of the semi-finished leather with a pattern paper, and the paper leather is separated after waiting for cooling, and the surface is made. deal with. The price of PU leather is more than double that of PVC leather. The price of 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 scrapped 4-5 times; the use period of the pattern roller is long, so the cost of PU leather is higher than that of PVC leather.

There are also some differences in the scope of application of these two materials. In terms of footwear, PVC leather is mostly used in the lining or non-weight-bearing parts, or in the manufacture of children's shoes; PU leather can be applied to the fabric of the footwear or the part bearing the weight. In terms of bags, PVC leather is more suitable. This is because the items in the bag are different from the feet worn in the shoes, and do not dissipate heat; do not bear the weight of the individual.

PinJun Electronic-The Difference Between Pu And Pvc Phone Case, Guangzhou Pinjun Electronic Co-1

The difference between PU and PVC is relatively easy. From the corner, the base fabric of PU is much thicker than PVC, and the hand feel is also different. The feel of PU is softer; the feel of PVC is harder; it can also be burned with fire, PU The taste is much lighter than the taste of PVC.

Identification method:

1, PU feels softer than PVC, good quality, good toughness, generally used to make fabrics, can withstand relatively large tensile forces;

2, the price of PU is more expensive than PVC;

3, PVC can be torn open, but PU can not;

4, PVC base cloth is generally relatively thin, relatively thin; PVC has more water needle cloth bottom and sweat cloth bottom, and PU cloth bottom quality is relatively high; PVC leather base is generally woven cloth and knitted cloth, The base of the PU leather is a non-woven fabric;

5, if you use fire, the taste of PU is relatively light, PVC will become black, smelly.

6. The specific gravity of PVC is larger than that of PU.

7, PVC has a deeper grain, and the foam layer in the middle is more obvious.

PU from the grain, including mirror PU, sheep PU, NappaPU, two-color PU, cork PU, metal PU, Helen PU, lychee PU, pigskin PU, R61 PU, crocodile PU, fish scale PU, soft lines and so on. The mirror PU is characterized by a bright surface, a wrinkled mirror PU, a crystal mirror PU, and a film mirror PU. The textures of Nappa, Helen (KMF), metal, and R61 are similar. The naked eye must be seen very fine to distinguish, mainly the difference in texture pattern. The two-color PU surface and the base fabric are the same color. Look carefully at the R61 grain, there are some small holes; the sheep pattern is a continuous small hole; Nappa's texture is more regular, more obvious; the rest is KMF's Helen pattern, there is no fixed rule in the texture; The texture is very light and very light. There is also a kind of elastic PU, which is more flexible. The semi-PU surface is PU, the base cloth is PVC, which is actually PVC, which can be torn by hand, and SemiPU also called PU.

PinJun Electronic-The Difference Between Pu And Pvc Phone Case, Guangzhou Pinjun Electronic Co-2

1. Artificial leather is mainly divided into imitation leather (or rubber) and advanced PU. Imitation leather or rubber compound is a general term for artificial materials such as PVC and PU. It is made of PVC or PU foaming or laminating on various fabrics or non-woven fabrics. It is characterized by a wide variety, good waterproof performance, neat edges, high utilization rate, and price. Relatively cheaper than genuine leather. The high-grade PU, the surface texture of the fibrous material of the base material, almost reaches the effect of the dermis, and its price is comparable to the price of the domestic top layer leather.

In the manufacturing process, the PVC leather is firstly melted into a paste by hot melt, and uniformly coated on the base of the T/C knitted fabric according to the specified thickness, and then foamed in the foaming furnace to make it adaptable. Produce a variety of different products, different requirements of softness, surface treatment at the same time of the release (dyeing, embossing, polishing, matting, grinding and raising, etc., mainly in accordance with specific product requirements).

PU leather is more complicated in manufacturing process than PVC leather. Since the base fabric of PU is a canvas material with good tensile strength, in addition to being coated on the top of the base fabric, the base fabric can be included in the middle to make it The appearance does not see the presence of the cloth. The physical properties of PU leather are better than those of PVC leather. It is resistant to tortuosity, softness, tensile strength and gas permeability (no PVC). The pattern of the PVC leather is made by hot pressing of a steel pattern roll; the pattern of the PU leather is pressed on the surface of the semi-finished leather with a pattern paper, and the paper leather is separated after waiting for cooling, and the surface is made. deal with. The price of PU leather is more than double that of PVC leather. The price of 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 scrapped 4-5 times; the use period of the pattern roller is long, so the cost of PU leather is higher than that of PVC leather.

PVC can be divided into soft PVC and hard PVC. Hard PVC accounts for about 2/3 of the market, and soft PVC accounts for 1/3. Soft PVC is generally used for the surface of floors, ceilings, and leather, but because soft PVC contains softener (this is also the difference between soft PVC and hard PVC), it is easy to become brittle and difficult to store, so its scope of use has been limited. Hard PVC does not contain softener, so it has good flexibility, easy to form, is not brittle, non-toxic and non-polluting, and has a long storage time, so it has great development and application value. Hereinafter referred to as PVC. The essence of PVC is a vacuum blister film, which is used for surface packaging of various types of panels. Therefore, it is also called decorative film and adhesive film and is used in many industries such as building materials, packaging, medicine and so on. The building materials industry accounts for the largest proportion, at 60%, followed by the packaging industry, as well as several other small-scale applications.

PinJun Electronic-The Difference Between Pu And Pvc Phone Case, Guangzhou Pinjun Electronic Co-3

2, synthetic leather (semi-PU leather)

Synthetic leather is a good leather substitute for winter leather jackets but is made from synthetic leather using TPU (polyurethane elastomer). The price of TPU is very expensive, so many domestic manufacturers use PVC to partially replace them. They do this: the cloth is coated with PVC (artificial leather) and then coated with TPU. This price can be greatly reduced, but the plasticizer in PVC will migrate out in less than a year, causing the synthetic leather (in fact, the artificial leather) to become hard and brittle, so some customers have bought a new leather jacket. It is brittle and cracked in a year. In fact, this factory producing synthetic leather is called semi-synthetic leather or semi-PU leather.

Semi-PU leather can be identified by a very simple method, that is, using copper wire to heat on the fire until the color of the fire is red (cannot have green), the copper wire is also burning red in the fire, and the copper wire is immediately Put it on the synthetic leather, the synthetic leather will melt onto the copper wire. Finally, put the copper wire on the fire and burn it. If the fire is green at this time, it proves that there is PVC, which is semi-PU leather, if at this time If the fire is red, it proves to be PU leather. This method is a simple method and can be used for general identification.

3. Characteristics and differences between PVC and PU

PVC is the first invented product for leather fabrics. It is made of PVC with plasticizer and other additives. It has the advantages of cheap price, rich color, and various patterns. The disadvantage is that it is easy to harden. Become brittle.

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 the leather fabric. It does not use plasticizer to achieve soft properties, so it does not become hard and brittle. At the same time, it has the advantages of rich colors and various patterns, and the price is cheaper than leather fabric. So it is welcomed by consumers.

The difference between PU and PVC is relatively easy. From the corner, the base fabric of PU is much thicker than PVC, and the hand feel is also different. The feel of PU is softer; the feel of PVC is harder; it can also be burned with fire, PU The taste is much lighter than the taste of PVC.

PU is polyurethane, PU leather is the skin of polyurethane. Nowadays, garment manufacturers use this material to produce garments, commonly known as imitation leather garments. PU is the abbreviation of English loyal urethane, chemical Chinese name polyurethane has good quality, good bag More imported PU leather;

PinJun Electronic-The Difference Between Pu And Pvc Phone Case, Guangzhou Pinjun Electronic Co-4

PU leather is the second layer of leather which is generally cowhide on the reverse side. It is coated with a layer of PU resin on the surface, so it is also called film cowhide. Its price is cheaper and its utilization rate is high. With the change of the process, it is also made into various grades, such as imported two-layer cowhide. Due to its unique craftsmanship, stable quality and novel variety, it is the current high-grade leather, and its price and grade are no less than the top layer of leather.

PU leather and leather bags have their own characteristics. PU bags have beautiful appearance, good care, low price, but not wearable and easy to break; leather is expensive, troublesome, but durable.


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