Basic knowledge of flexible packaging plastic film

Basic definition: flexible packaging plastic film packaging generic term in the country, GB4122— 83). , flexible packaging is defined as: flexible packaging refers to after filling or remove the built-in container shape can change of packing. Paper, aluminum foil, fiber, plastic film and their compounds made all kinds of bags, boxes, set for flexible packaging, coating, etc. Generally at zero thickness. 25 mm below the flake plastics called film. Flexible packaging plastic film transparent, flexible, good water resistance, moisture resistance, and resistance, good mechanical strength, chemical stability, resistance to grease, beautifully printed graphic easily, can heat sealing bag making. Packaging requirements, it can satisfy all kinds of things is convenient for packaging easy to deposit, easy to put food, articles for daily use, small packaged goods ideal material of the supermarket. Predominantly flexible packaging plastic film, occupies an important position in the flexible packaging printing in packaging and printing. According to statistics, since 1980, some advanced countries in the world of plastic packaging of the packaging and printing of 32. 5% ~ 44%. In general, because of a single thin film materials with protective is not ideal, so we adopt to two or more compound for a layer of thin film composite membrane, in order to meet the requirements of food preservation and aseptic packaging technology. The outer layer of the composite membrane material selection more difficult to cut, grinding, good optical performance and printing performance of good material, such as: paper, cellophane, stretching polypropylene, polyester, etc. ; The middle layer is the barrier property of polymer, such as aluminum foil, aluminum evaporation, poly vinyl dinitrogen over electric layer material selection more non-toxic, tasteless polyethylene thermoplastic resin, etc.