Consumers generally refer to synthetic leather other than genuine leather, such as PVC and PU leather, as synthetic leather or imitation leather. PVC and PU are both polyvinyl chloride (a type of plastic), but their manufacturing processes are not exactly the same.

Take PVC luggage leather as an example. In the process of making PVC luggage leather, plastic particles are first melted and mixed into a paste, evenly coated on a T/C knitted fabric base according to the specified thickness, and then foamed in a foaming furnace to make it soft enough to adapt to the production of various products and different requirements. At the same time as being discharged from the furnace, surface treatment is carried out (dyeing, embossing, polishing, matting, surface fuzzing, etc., mainly according to specific product requirements).

PU leather has a more complex manufacturing process than PVC leather. Due to the fact that the PU base fabric is a canvas PU material with good tensile strength, it can not only be coated on top of the base fabric, but also contained in the middle, making it difficult to observe the presence of the base fabric. The physical properties of PU leather are better than PVC leather, with resistance to bending, good softness, high tensile strength, and breathability (PVC does not). The stripes on PVC leather are formed by hot pressing steel stripe rollers; The stripes on PU leather are first hot pressed onto the surface of semi-finished leather using a pattern paper, and then separated from the paper leather for surface treatment after cooling down. The price of PU leather is more than twice as high as PVC leather, and the price of certain special requirements PU leather is 2-3 times higher than PVC leather. The pattern paper required for general PU leather can only be used 4-5 times and will be invalidated; The use cycle of striped rollers is long, so the cost of PU leather is higher than that of PVC leather.

There is also a certain difference in the scope of application between these two types of information. In terms of footwear, PVC leather is often used for lining or non weight receiving parts, or for making children's shoes; PU leather can be applied to the fabric of shoes or the parts that receive weight. In terms of bags, PVC leather is more commonly used. This is because the items in the bag are different from the feet worn in shoes and do not emit heat; No need to accept personal weight. The difference between PU and PVC is relatively easy. From the corners, the bottom fabric of PU is much thicker than PVC, and there are also differences in hand feel. PU has a softer hand feel; PVC has a harder hand feel; It can also be burned with fire, and the taste of PU is much milder than that of PVC.

Article source: Leather punching machine manufacturerhttp://www.hslichuang.com/