The composite flexible packaging bags

About flexible packaging composite is as follows: in the industry say 'composite' is actually the meaning of 'laminated', is the different nature of the film through a certain way to make it together, then through sealing, protect the contents. Flexible packaging laminated structure according to the different way of combination of classification is very much, can't use a system to illustrate the structure of different, but the structure of the conventional soft packing often can use outer layer, middle layer, adhesive layer and inner layer to distinguish. The typical three layer composite structure. 1, the outer layer material. Is usually a good mechanical strength, heat resistance, good printing performance and good optical properties of materials. At present the most commonly used is the polypropylene, polyester, nylon, drawing paper etc. 2, and middle layer material. Intermediary material is usually used to strengthen a certain properties of composite structure, such as barrier property, shading sex, sex, strength and other properties. Now is the most commonly used in the aluminum foil, aluminum plating film, polyester, nylon, such as partial poly 2 vinyl chloride coating film material. 3, the inner material. Lining material is the key, is the most important role in sealing, followed by pressure, fall, airtight performance of packaging material. By far the most commonly used is not stretching polypropylene, polyethylene and their modified materials. 4, ink layer. Ink layer is to realize the main functions of graphic information transmission and color reproduction, achieve promotion function to a certain extent, and the selection of ink must and packing after processing and product flow conditions. 5, resin layer. Is the role of resin layer of two or more than two layers of material together, make it as a whole. Resin layer and the bonding strength between the film materials is an important index for composite film internal performance evaluation, different packaging requirements for adhesive characteristics different tolerance requirements are put forward.