Co-extruded film is used in pure milk bags, express bags, and metal protective films. It is characterized by good tensile properties and good surface brightness.
Introduction:
In the processing of the film, a raw material is extruded onto another film that has been made, or the different kinds of films that have been made are bonded together to form a multi-layer film. This product is called a composite film. The material of the composite film is mostly plastic, but paper, metal foil (usually aluminum) or fabric can also be used. The basic requirement of the composite film is to have good adhesion between the layers to ensure the overall mechanical properties of the packaging. In addition, composite films are mostly used for food packaging, and adhesives are used in the processing of composite films, and the selection of solvents and bonding processes must meet the corresponding hygienic standards. Co-extruded films have most of the characteristics of composite films, but with one difference, that all layers of co-extruded films are extruded at the same time, so there will be no other non-plastic materials such as aluminum foil, paper, etc. The combination of product materials is relatively small, and the scope of application is also small. However, because the winter bonding layers are bonded by hot melt without adhesives, the hygienic safety of the co-extruded film for food packaging is relatively reliable.
