What is the production process of PVC film?
Release time:
Jan 02,2019
Source:
The production process of PVC film is unpacking, inspection, sieving, formula-mixing → granulation → extrusion of thick film → air cooling → hot water bath boiling water heating → horizontal inflation of shaping cylinder → bubble quenching by film clamping roller → winding into heat shrinkable film.
The production process of PVC is not complicated. The common production line is generally composed of a rolling machine, a printing machine, a back coating machine and a cutting machine. The film with a thickness of only 0.3mm to 0.7mm is mainly produced through the direct stirring of the rolling machine, the rotation of the roller and the high-temperature rolling. At the same time of production, the front surface of the film is printed with color by the printing machine, and a layer of back coating is attached to the back surface on the back surface of the film. Don't underestimate this layer of back coating, it is an important guarantee for the high quality performance of PVC film. The back coating is composed of special materials and is a high-energy affinity agent. It is precisely because of this back coating that the PVC film can be tightly fused with the medium-dense plate or other plates, and the glue will not be opened for ten or even fifteen years. The biggest problem with ordinary sticking film is that it cannot solve the problem of film shedding. Since the entire production process is carried out at high temperatures (the temperature in the rolling machine reaches 220 degrees), this makes the PVC film have high light resistance and fire resistance, ensuring the high quality of the PVC film. Of course, this requires very high production machines. Usually, the cost of production equipment for a production line is about 3,000 9 million marks, which is equivalent to about 0.16 billion yuan. But on the other hand, the production process of PVC film is quite simple, and the machine output is also very large, so from a comprehensive point of view, PVC is actually a low-input, high-yield product.
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