Barrier property of packaging material

With the continuous development of packaging materials, more and more strict with bags and all kinds of products, the barrier property of packaging material is also growing. Bags of barrier property refers to the water vapor barrier property and oxygen barrier property of two parts. Bags of water vapor barrier property mainly is to prevent water molecules penetrate the bags inside, the performance of the product be affected with damp be affected with damp. Oxygen barrier property is to prevent the oxygen molecules into the bags, and facilitate the filters through the performance of the oxygen molecules inside the bag. Usually can through the following several aspects to improve the barrier property of packaging. 【 Guangdong bags 】 A way, through the multi-layer composite by putting a number of different material composite membrane, in order to improve the barrier property of the packaging bags, is currently the most packaging production enterprises to adopt a way. Through the way of multilayer composite, dislocation of compound by different molecular clearance, blocking water vapor into the bag. Usually this kind of composite material has: PET/AL/PE, PP/NY/PE, etc. , including PE with good water vapor barrier property. Second, through the extrusion process by putting a number of different material eutectic melting extrusion, change between each material molecular density. To improve the barrier property packet at a time. Co-extrusion high barrier material PDVC usually use the OPP or PET as base material of common extrusion forming. EVOH is out jointly by ethylene and ethylene glycol, ethylene decided the barrier property, the dosage of ethylene with, the more the lower the barrier property. Now commonly used material also has a nylon class. Three, coating process is usually the nano inorganic coating on the printing material, nano inorganic molecules filled into molecular gap of printing materials, improving the barrier property of the packaging material. This kind of commonly used with PVA coating. Along with the unceasing development, the barrier property of packaging material is getting better and better, there are super block material BOPET, LDPE. Or all kinds of high barrier material of multilayer composite can improve the barrier property of packaging material.