What kind of material is plastic film? What is the use of plastic film?

What is the material of the plastic film? What is the material of plastic film?

Plastic film is a film made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, used for packaging and as a coating. Plastic packaging and plastic packaging products in the market share is growing, especially composite plastic soft packaging, in food, medicine, chemical and other fields have been widely used, food packaging accounted for the largest proportion, such as beverage packaging. These products bring great convenience to people's life.

The use of plastic film

1. Adopt biaxial oriented polypropylene film (BOPP)

Polypropylene film is a transparent and flexible packaging material developed in 1960s. Polypropylene raw materials and functional additives mixed, melting, kneading into thin sheets, after stretching to form a special film production line. BOPP film not only has the advantages of low density of PP resin, good corrosion resistance and heat resistance, but also has good optical properties, high mechanical strength and rich raw materials.

In addition, it can also be used to prepare high value-added functional products such as electromembrane and microporous membrane. Therefore, BOPP thin films have a promising future. By 2004, the production capacity of BOPP film production line in China was 1.9 million tons, and the actual production capacity was about 1.76 million tons.

2. Use of low density polyethylene film (LDPE)

Low density polyethylene film is usually produced by blow molding and casting. The polyethylene casting film is uniform in thickness but is rarely used because of its high cost. Blow molding polyethylene film is formed by blow molding PE particles by blow molding machine blow molding, low cost, the most widely used. Low density polyethylene film is a translucent, shiny, soft film with excellent chemical stability, thermal seal, water and moisture resistance, frost resistance, boiling and agricultural use. Membrane can be divided into film, plastic film, bitter film and green film.

3. The use of polyester film (PET)

PET film is a kind of thermoplastic engineering plastics. It has the characteristics of high temperature resistance, good printing performance, convenient processing and good insulation performance. It is made of polyethylene terephthalate as raw material, thick film by extrusion method, and then by biaxial stretch film material. It is a colorless, transparent, shiny film, with excellent mechanical properties, high rigidity, hardness, toughness, puncture resistance, friction resistance, high temperature resistance, low temperature resistance, chemical resistance, oil resistance, gas tightness and aromatic retention. Well, it is a commonly used barrier composite film substrate. But the price of polyester film is relatively higher, the thickness is generally 0.12 mm, usually used as dry distillation packaging outer material, printing.

4. Use of nylon (Pa) plastic film

The chemical name for nylon is polyamide (Pa). At present, the nylon variety that industry produces is very much. Among them, the main varieties used in the production of thin films are Pa6, Pa12, Pa66 and so on. 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. With good wear resistance and wear resistance, soft, oxygen barrier, but the water vapor barrier poor, high moisture absorption, heat seal poor, suitable for oily food, meat products, Fried food, vacuum packaging food, cooked food and other hard products packaging.

5. use cast polypropylene film (CPP)

Cast polypropylene film can be divided into general CPP film, aluminized CPP film and cooking grade CPP film, with good transparency, uniform thickness, uniform longitudinal and transverse properties, usually used as the inner material of composite film. Ordinary CPP films are typically 25 to 50 microns thick. Compound with OPP, good transparency, bright surface, feel firm. This material is commonly used in gift packages. The film also has good thermal sealing performance. Cooking grade CPP films are typically 60 to 80 microns thick. It can withstand boiling at 121°C for 30 minutes. It has good oil resistance and air tightness, and high heat sealing strength. The inner layer of a typical meat package is uniform. Use cooking grade CPP film.

6, aluminized plastic film use

Aluminizing film is a kind of composite soft packaging material.

The surface of the film is aluminized to prevent light and ultraviolet radiation, which not only extends the shelf life of the content, but also improves the brightness of the film. To a certain extent instead of aluminum foil, with low cost, good appearance, good barrier and other advantages. Aluminized film is widely used in composite packaging. It is mainly used for packing dry and puffed food such as biscuits, as well as some medicine and cosmetics.