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Introduction of co-extruded film
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The co-extruded film is used for pure milk bags, express bags and metal protective films. It has the characteristics of good tensile properties and good surface brightness.
In the film processing, a raw material is extruded onto another film that has been produced, or different kinds of films that have been produced are bonded to each other 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 package. In addition, the composite film is mostly used for food packaging. Adhesives should be used for composite membrane processing, and the selection of solvents and bonding processes should meet the requirements of the corresponding sanitary standards. The co-extruded film has most of the characteristics of the composite film, but there is a difference, that is, all the layers of the co-extruded film are extruded at the same time, so there will be no other non-plastic materials such as aluminum foil and paper. The combination of product materials is relatively small, and the scope of application is also small. However, since the winter laminate layer is bonded by hot melt and there is no adhesive, the hygiene and safety of the food packaging co-extruded film should be relatively reliable.
Common practical applications of co-extruded films include: pure milk bags, express bags, and metal protective films.
For example, a kind of co-extruded film: black and white film, used to make express bags or milk bags, because the hard objects or various factors in the express bags are easy to break, so it is impossible to use ordinary PE film, so co-extruded film is required; Coincidentally, food bags (such as pure milk bags) are also required to meet food standards and are not easy to damage, so co-extruded films should be used. White film belongs to double layer co extrusion film. When the plastic is extruded, the two heads extrude the black PE film and the white PE film at the same time, and the film is bonded together when it is still in a semi-liquid state, without glue and other chemical substances.
The main features of the co-extruded film: good tensile properties, bright surface, to meet a number of standards for adhesive film and food film.
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