China Plastics Network tells the classification of plastic film

China Plastics Network tells the classification of plastic film

1.PVA coated high barrier film

PVA coated high barrier film is coated with PNA coated with nano inorganic material and then printed and compounded by plastic film. It has better barrier performance than EVOH without greatly increasing the cost. The five-layer co-extruded film, and the packaging cost is also greatly reduced, which not only ensures the quality requirements of the packaged materials for aseptic packaging, but also greatly reduces the cost of aseptic packaging for food processing enterprises, and can be used for packaging beverages, juices. , milk, soy sauce vinegar, etc. For more information on the latest film and plastics industry, please refer to the “2015-2020 Film Plastic Bag Sealing Equipment Market Condition Monitoring and Investment Feasibility Study Report” published in the China Report Hall.

2. Biaxially oriented polypropylene film (BOPP)

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~. 40 μm, the most widely used is 20 μm. The main disadvantage of the biaxially oriented polypropylene film is that it has poor heat sealability, so it is generally used as an outer film of a composite film. For example, it is ideal for moisture resistance, transparency, strength, stiffness and printability after being combined with a polyethylene film. Contains dry food. Since the surface of the biaxially oriented polypropylene film is non-polar, the crystallinity is high, and the surface free energy is low, the printing performance is poor, the adhesion to the ink and the adhesive is poor, and the surface is required before printing and compounding. deal with.

3. Low density polyethylene film (LDPE)

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. Its main disadvantage is its poor barrier to oxygen. It is commonly used in the inner film of composite flexible packaging materials. It is also the most widely used and widely used plastic packaging film, accounting for more than 40% of the consumption of plastic packaging film. .

4. Polyester film (PET)

The polyester film is a film material made of polyethylene terephthalate as a raw material, formed into a thick sheet by extrusion, and then biaxially stretched. It is a colorless, transparent and lustrous film with excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and aroma retention. Good, it is one of the commonly used barrier composite film substrates. However, the price of the polyester film is relatively high, and the thickness is generally 12 μm. It is commonly used as an outer layer material for retort packaging, and has good printability.

5. Nylon film (PA)

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 has excellent abrasion and puncture resistance, is soft and has good oxygen barrier properties, but has poor barrier to water vapor, high moisture absorption and moisture permeability, and poor heat sealability. It is suitable for packaging hard articles such as greasy. Food, meat products, vacuum packed foods, cooked foods, etc.

6. Cast polypropylene film (CPP)

The cast polypropylene film is a polypropylene film produced by a casting process, and can be divided into two types: ordinary CPP and cooking grade CPP. The transparency is excellent, the thickness is uniform, and the longitudinal and lateral properties are uniform, and generally used as a composite film. Layer material. The thickness of ordinary CPP film is generally between 25 and 50 μm. After compounding with OPP, the transparency is good, the surface is bright, and the hand feel is firm. The general gift packaging bag uses this material. This film also has good heat sealability. The thickness of the cooking grade CPP film is generally between 60 and 80 μm. It can withstand high temperature cooking at 121 ° C for 30 min. It has good oil resistance and air tightness, and the heat sealing strength is high. The inner layer of the general meat package is cooked. Grade CPP film.

7. Aluminized film

The most widely used aluminized films are mainly polyester aluminized film (VMPET) and CPP aluminized film (VMCPP). 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. Aluminized film is widely used in composite packaging.