Plastic packaging and plastic packaging products occupy an increasing share in the market, especially composite plastic flexible packaging, which has been widely used in food, medicine, chemical and other fields, among which food packaging accounts for the largest proportion, such as beverage packaging. , frozen food packaging, cooking food packaging, fast food packaging, etc., these products have brought great convenience to people's lives.
Film type
PVA coated high barrier film
The PVA coated high barrier film is formed by applying PNA coated with nano inorganic materials to a polyethylene film and then printing and compounding the plastic film at a cost-effective manner.
Under the premise of cost, its barrier performance is not only significantly better than EVOH five-layer co-extruded film, but also the packaging cost is greatly reduced, which not only ensures the quality requirements of the packaged materials for aseptic packaging, but also greatly reduces the food processing. The cost of aseptic packaging for enterprises can be used to package beverages, juices, milk, soy sauce vinegar, etc.
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 μ m, the most widely used is 20 μ m. The main disadvantage of biaxially oriented polypropylene film is poor heat sealability, so it is generally used as the outer film of composite film, such as moisture resistance and transparency after compounding with polyethylene film. It is ideal for strength, stiffness and printability and is suitable for dry foods.
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.
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. .
Since the polyethylene molecule does not contain a polar group and has high crystallinity and low surface free energy, the film has poor printing performance and poor adhesion to inks and adhesives, so it is required before printing and compounding. Surface treatment.
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.
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. Excellent wear resistance and puncture resistance, soft and oxygen barrier, but poor barrier to water vapor, high moisture absorption and moisture permeability, poor heat sealability, suitable for packaging hard articles, such as greasy Sex food, meat products, fried foods, vacuum packed foods, cooked foods, etc.
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 μ m. 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 packaging is uniform. A cooking grade CPP film is used.
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.
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