PVC film popular science co-extrusion film.

The co-extrusion film of PVC film is used in pure milk bags, express bags, and metal protective films. It is characterized by good tensile properties and good surface brightness. Common practical applications of co-extrusion film include: pure milk bags, express bags, and metal protective films. For example, a type of co-extrusion film: black and white film, used to make express bags or milk bags, because the express bags contain hard objects or a variety of factors make the bags easy to break, so it is not possible to use ordinary PE film, you need to use co-extrusion Membrane; coincidentally, food bags (e.g. pure milk bags) are also required to meet food standards and not easy to break, so co-extrusion film must be used. The black and white film is a double-layer co-extrusion film. When the plastic is extruded, there are two heads to simultaneously extrude the black PE film and the white PE film. When the film is still in a semi-liquid state, it is glued together, without the need for chemicals such as glue. To glue.

In the film processing, one kind of raw material is extruded onto another film that has been made, or different kinds of films that have been made are bonded together to form a multilayer 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 layers to ensure the overall mechanical properties of the packaging. In addition, composite films are mostly used for food packaging. Adhesives are used in the processing of composite films. The selection of solvents and bonding processes must meet the requirements of corresponding sanitary standards. Co-extruded film has most of the characteristics of composite film, but there is one difference, that is, all layers of co-extruded film are extruded at the same time, so there are 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, because the winter layer and the layer are bonded by hot melt without adhesives, the hygiene and safety of the food packaging co-extruded film must be relatively reliable.

This is the introduction about the co-extrusion film of PVC film.