What is the packaging coil? — Packaging printing

Roll of film in the packaging industry there is no clear strict definition, but the industry established a name, simple is to roll up the packaging film, for packaging production enterprises is just less than a process with the production of the finished bag, its material type is also consistent with plastic bags, common PVC shrink film roll film, opp film, PE film, pet protective film, composite film, etc. Roll of film is applied to automatic packing machine, such as common shampoo sachets, adopts the model of this kind of packing part of wet wipes and so on. Using roll of film packaging costs relatively low but need to form a complete set of automatic packing machine. In addition, we also meet in daily life to application of a roll of film in selling cups of milk tea, porridge shop you often see a field packaging sealing machine, it USES the sealing film is a roll of film. The most common type of film packaging packaging bottles, and the general use of heat shrinkable film, such as part of the coke, mineral water, etc. , especially not cylinder shaped bottle is widely used heat shrinkable film. 【 Packaging printing 】 The structure of the composite film is according to the characteristics of built-in objects to develop a certain structure, generally speaking, there are three layers, four layers. The outer materials tensile polypropylene, polyester, nylon, paper etc. The middle layer material of aluminum foil, aluminum plating film, polyester, nylon, etc. The inner material flow delay poly acrylic, polyethylene, etc. According to the three layers of material to develop a different composite membrane structure.