The development of artificial leather has basically experienced three stages, that is, PVC artificial leather coated with PVC polymer materials appeared in the 1930s, which has realized the practical application of industrialization in the replacement of natural leather. This is the first generation of artificial leather.
In the manufacturing process of PVC leather, the plastic particles are melted and stirred into a paste, evenly coated on the T / C knitted fabric substrate according to the specified thickness, and then foamed in the foaming furnace to make it have softness that can adapt to the production of various products and different requirements, Surface treatment (dyeing, embossing, polishing, matting, surface roughening, etc., mainly according to specific product requirements) shall be carried out at the same time of discharging.
The manufacturing process of PU leather is more complicated than that of PVC leather. Because the Pu base cloth is canvas PU material with good tensile strength, it can not only be coated on the base cloth, but also be included in the middle, so that the existence of the base cloth can not be seen outside. The physical properties of PU leather are better than those of PVC leather, with twists and turns resistance, good softness, high tensile strength and air permeability, which is the advantage that PVC does not have.
The difference between Pu artificial leather and PVC artificial leather is mainly reflected in the following aspects:
1. Pu feels softer than PVC, with good quality and toughness. It is generally used as fabric and can withstand relatively large tensile force;
2. Pu is more expensive than PVC;
3. PVC can be torn by force, but Pu cannot;
4. PVC bottom cloth is generally thin and thin; PVC has more water needle cloth bottom and sweat clothes cloth bottom, while Pu cloth bottom has higher quality; The base of PVC leather is generally textile cloth and knitted cloth, and the base of PU leather is non-woven cloth;
5. If you burn with fire, the taste of Pu is relatively light, and PVC will turn black and stink.
6. The specific gravity of PVC is larger than that of PU.
7. PVC has deep lines and obvious foaming layer in the middle.