Our company specializes in the production of composite packaging bags, and the so-called composite packaging bags are composited by a variety of materials, usually two, three or more layers of materials. So what materials are generally used in composite packaging bags? In this article, the packaging bag manufacturers will analyze it with you. 1. AL metal aluminum foil (calendered aluminum foil or pure aluminum foil); this aluminum foil bag is the company’s main product. 2.PE (polyethylene) blown plastic film. 3. CPE (polyethylene) unstretched cast plastic film. 4. PP (polypropylene) blown plastic film; 5. CPP (polypropylene) unstretched cast plastic film; Cast polypropylene film is a polypropylene film produced by a casting process, and can be divided into ordinary There are two types of CPP and cooking grade CPP, with excellent transparency, uniform thickness, and uniform vertical and horizontal properties, generally used as the inner layer material of composite films. The thickness of ordinary CPP film is generally between 25~50μm. After compounding with OPP, the transparency is good, the surface is bright, and the hand feel is firm. This material is used in general gift packaging bags. This film also has good heat sealability. The thickness of the cooking-grade CPP film is generally between 60 and 80 μm, and it can withstand high-temperature cooking at 121 ° C and 30 min. It has good oil resistance, air tightness, and high heat sealing strength. Retort grade CPP film is used 6.OPP (polypropylene) uniaxially stretched plastic film; 7.BOPP (biaxially oriented polypropylene film) Biaxially oriented polypropylene film is formed by co-extrusion of polypropylene particles into a sheet. , and then obtained by stretching in both vertical and horizontal directions. Due to the orientation of the stretched molecules, this film has good physical stability, mechanical strength, air tightness, high transparency and gloss, toughness and wear resistance, and is the most widely used printing film at present. Generally, the thickness is 20~ 40 μm, the most widely used is 20 μm. The main disadvantage of biaxially oriented polypropylene film is poor heat sealing, so it is generally used as the outer film of the composite film. Serving dry food. Because the surface of the biaxially oriented polypropylene film is non-polar, high in crystallinity and low in surface free energy, its printing performance is poor, and the adhesion to ink and adhesives is poor. deal with. 8. ZBOPP (polypropylene) biaxially oriented pearl film; 9.XBOPP (polypropylene) biaxially oriented matte plastic film; 10. BOPET (polyester) biaxially oriented plastic film; PA (nylon) bidirectional stretched plastic film; it is the main material of vacuum packaging bags. Nylon film is a very tough film with good transparency, good gloss, high tensile strength and tensile strength, and good heat resistance, cold resistance, oil resistance and organic solvent resistance. It has excellent abrasion resistance and puncture resistance, and is relatively soft and has excellent oxygen barrier properties, but has poor water vapor barrier properties, high moisture absorption and moisture permeability, and poor heat sealing properties. It is suitable for packaging hard items, such as greasy Sex food, meat products, fried food, vacuum-packed food, retort food, etc. Such as high temperature cooking bags 11.KBOPA (coated polyvinylidene chloride) high-barrier nylon biaxially oriented plastic film; 12.PVC (polyvinyl chloride) film or polyvinyl chloride heat shrinkable plastic film; 13.OPVC (polyvinyl chloride) 14.PVA (polyvinyl alcohol) plastic film; 15.PVDC (polyvinylidene chloride) high barrier plastic film; 16.PT (cellophane) plastic film ( Also known as Sai Luo or Sai Luo Luo); 17.EVA (vinyl acetate) plastic film; 18.DAL vacuum evaporation aluminum plastic film, etc.; this material is used in high temperature cooking bags. 19. PET polyester film Polyester film is made of polyethylene terephthalate as raw material, made into thick sheet by extrusion method, and then made of biaxially stretched film material. It is a colorless, transparent and glossy 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 fragrance retention Good, it is one of the commonly used barrier composite film substrates. However, the price of polyester film is relatively high, and the general thickness is 12mm. It is often used as an outer layer material for retort packaging, and has good printability. CPP aluminized film (VMCPP). Aluminized film has both the characteristics of plastic film and the characteristics of metal. The function of aluminum plating on the surface of the film is to block light and prevent ultraviolet radiation, which not only prolongs the shelf life of the contents, but also improves the brightness of the film. It replaces aluminum foil to a certain extent. , Aluminized film is widely used in composite packaging. Currently, it is mainly used in the packaging of dry and puffed food such as biscuits, as well as the outer packaging of some medicines and cosmetics. For example, the tea packaging bags produced by our company are mostly made of aluminized materials.