PVC film classification

Polyvinyl chloride films can be roughly divided into two categories, one is plasticized PVC film, also known as soft PVC film (Plasticized PVC Film), and the other is unplasticized PVC film, also known as hard PVC film (Unplasticized PVC film).

Among them, hard PVC accounts for about 2/3 of the market, and soft PVC accounts for 1/3. Soft PVC is generally used for floors, ceilings and the surface of leather. However, because soft PVC contains softeners (this is also the difference between soft PVC and hard PVC), it easily becomes brittle and difficult to preserve, so its range of use is limited. Hard PVC does not contain softeners, so it has good flexibility, is easy to shape, not brittle, non-toxic and non-polluting, and has a long storage time, so it has great development and application value. The essence of PVC film is a vacuum plastic-absorbing film, which is used for surface packaging of various types of panels. Therefore, it is also called decorative film and adhesive film. It is used in many industries such as building materials, packaging, medicine, etc. Among them, the building materials industry accounts for the largest proportion, 60%, followed by the packaging industry, and several other small-scale application industries.

⑴ Classification according to the raw materials used for film forming: polyethylene film, polypropylene film, polyvinyl chloride film and polyester film, etc.

⑵ Classification by film use: There are agricultural films (agricultural films can be divided into mulch films and greenhouse films according to their specific uses); packaging films (packaging films can be divided into food packaging films and various industrial products according to their specific uses). packaging film, etc.) and breathable films for special environments and special purposes, water-soluble films and films with piezoelectric properties, etc.

⑶ Classification according to the film forming method: there are films that are plasticized by extrusion and then blow molded, which are called blown films; films that are plasticized by extrusion and then cast by molten material from the mold mouth are called cast films. ; The film made of plasticized raw materials rolled by several rollers on the calender is called calendered film.

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