China Plastics Network talks about the use of seven plastic films

1, PVA coated high barrier plastic film use

The PVA coated high barrier film is formed by applying PNA coated with nano inorganic materials to a polyethylene film and printing and compounding. Under the premise of not greatly increasing the cost, the barrier property is not only superior to that of the EVOH five layers. The film is squeezed, and the packaging cost is also greatly reduced, which not only ensures the quality requirements of the packaged product for aseptic packaging, but also greatly reduces the cost of aseptic packaging for food processing enterprises.

2. Biaxially oriented polypropylene film (BOPP) use

The biaxially oriented polypropylene film is obtained by coextruding polypropylene particles into a sheet and then stretching in both directions. Due to the orientation of the stretched molecules, the film has good physical stability, mechanical strength, air tightness, high transparency and gloss, and is tough and wear resistant. It is the most widely used printing film at present, and generally has a thickness of 20~. 40μm, the most widely used is 20μm.

3. Low density polyethylene film (LDPE) use

Low density polyethylene films are generally produced by both blow molding and casting processes. The thickness of the cast polyethylene film is uniform, but it is the most widely used because of its high price and low cost. Low-density polyethylene film is a translucent, shiny, soft-textured film with excellent chemical stability, heat-sealing, water resistance and moisture resistance, freeze-resistant and boilable. The main disadvantage is that the barrier to oxygen is poor.

4, polyester film (PET) use

Polyester film (PET), commonly known as polyethylene terephthalate, is a thermoplastic engineering plastic. A film material which is formed into a thick sheet by extrusion and then biaxially stretched. Polyester film is characterized by excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, high temperature resistance and low temperature, chemical resistance, oil resistance, air tightness and good aroma retention. It is a commonly used barrier composite film. One of the substrates, but the corona resistance is not good.

5, nylon plastic film use

The chemical name of nylon is polyamide (PA). Currently, there are many varieties of nylon produced industrially. Among them, nylon 6, nylon 12 and nylon 66 are mainly used to produce films. Nylon film is a very tough film with good transparency, good gloss, high tensile strength, high tensile strength, good heat resistance, cold resistance, oil resistance and organic solvent resistance. It is excellent in abrasion resistance and puncture resistance, and is relatively soft and has excellent oxygen barrier properties. However, it has poor barrier properties against water vapor, has high moisture absorption and moisture permeability, and is poor in heat sealability, and is suitable for packaging hard articles.

6, cast polypropylene film (CPP) use

The cast film is a non-stretched, non-oriented, flat extruded film produced by melt casting and quenching. It is characterized by high production speed, high output, good transparency, gloss and uniformity of film, and excellent balance of performance. Because it is a flat film, the subsequent work such as printing, compounding, etc. is extremely convenient, and is widely used in the packaging of textiles, foods, and daily necessities.

7. Aluminized plastic film use

The aluminized film has both the properties of a plastic film and the properties of a metal. The surface of the film is coated with aluminum to prevent light and ultraviolet radiation, which not only prolongs the shelf life of the content, but also improves the brightness of the film. It replaces the aluminum foil to a certain extent, and has the advantages of low cost, good appearance and good barrier property. Therefore, the application of aluminized film in composite packaging is very extensive.