What material is pvc film

　There are two very important reasons why PVC can be widely used in the building materials industry: one is the unique properties of PVC (rainproof, fire-resistant, antistatic, and easy to form), and the other is the characteristics of low investment and high output of PVC. So, why does PVC have the above two advantages? Let us find the answer from its production process. The production process of PVC is not complicated. The ordinary production line generally consists of a roller press, a printing press, a back coating machine and a cutting machine. The thickness is only produced by the direct stirring of the roller press, the rotation of the roller and the high temperature rolling. For the film from 0.3 mm to 0.7 mm, it is produced and printed on the front side of the film by a printing machine, and a layer of back coating is attached to the back of the film by a back coater. Don't underestimate this back coating, it is an important guarantee for the performance of the PVC film. The back coating is composed of special materials and is a kind of high-energy affinity agent. It is precisely because of this back coating that the PVC film can be tightly integrated with the medium-density board or other boards. It will not be glued for ten or even fifteen years. The biggest problem with ordinary face masks is that they cannot solve the problem of film shedding. Since the whole production process is carried out at high temperature (the temperature in the roller press reaches 220 degrees), this makes the PVC film have high light resistance and fire resistance, and ensures the high quality of the PVC film. Of course, this requires very high production machines. Usually, the cost of a production line is about 39 million marks, which is equivalent to about 160 million yuan. But on the other hand, the production process of PVC film is quite simple, and the machine output is also large. Therefore, PVC is actually a low-input, high-yield product.