JPH0322814B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite film formed by adhering and laminating two films, and particularly to a manufacturing method suitable for obtaining a composite film having a printed layer inside.

Composite films of various configurations are used as packaging materials for packaging various foods. When printing on such a composite film, one of the pre-printed constituent materials is incorporated in the process of composite processing of the composite film so that the printed layer is on the inner surface of the composite film to protect and protect the printed layer. It is usually done to enhance the aesthetic effect. As a method for manufacturing such a composite film having a printed layer on the inner surface, printing is applied to one outer surface of a double polymerized film, and after applying an adhesive to the other outer surface, the film is rolled while polymerized. There is a method in which the film is wound up, and then the outer end of the wound film is peeled off and the printed layer is placed on the inner surface while being rewound.

However, the above method has the disadvantage that it is time-consuming and difficult to carry out continuous production.

The present invention has found a method capable of solving the above-mentioned drawbacks, and its gist is to peel off the double polymerized films 1 and 2 with two peeling rolls 5 and 6, and , 2 are advanced from the outside of the rolls into the roll gap of two reversing rolls 7 and 8 disposed intersectingly with respect to the traveling direction of the film, the front and back of each film is reversed, and then the films are laminated. A method of manufacturing a composite film is provided.

The present invention will be explained below based on the drawings.

1 is a perspective view of a film reversing device used to carry out the method of the present invention, A in FIG. 2 is a schematic cross-sectional view of the film at A in FIG. 1, and B is a cross-sectional view of the film at B in FIG. 1. It is a schematic diagram.

Double polymerized film 1 in the present invention,
2 may be different types of films, but
Fold the cylindrical inflation film,
A similar type with the ears removed at both ends is advantageous for continuous production.

Each of the films 1 and 2 may be a laminated film in which a plurality of layers are bonded together.

The above polymerized film is provided with a printing layer 3 on the outside of the film 1 and an adhesive layer 4 on the outside of the film 2, as shown in FIG. 2A. The printed layer 3 can be provided by a normal gravure printing method, and the adhesive layer 4 can be provided by a normal dry laminating adhesive using a roll coater or the like. Note that a surface activation treatment such as a corona treatment may be performed on the surface of the film before the above-mentioned printing layer or adhesive layer is provided.

The films 1 and 2 are then peeled off vertically by peeling rolls 5 and 6. Peeling rolls 5, 6
is a drive roll whose rotation speed can be changed. The rotation speed may be determined depending on the final production speed of the composite film. The peeled films 1 and 2 are turned over by reversing rolls 7 and 8. The reversing rolls 7 and 8 are disposed vertically and parallel to each other at an angle of approximately 45° to the direction in which the film travels from the peeling rolls 5 and 6. The reversing roll is also a driving roll like the peeling roll. Film 1, 2
By advancing the film from the outside of the reversing roll into the roll gap, the front and back sides of the film can be reversed. Providing a large number of air holes in the reversing rolls 7 and 8 and discharging compressed air from the air holes to reduce the frictional resistance between the film and the rolls is effective in preventing wrinkles in the film. As shown in FIG. 2B, the film after inversion has a structure in which a printing layer and an adhesive layer are sandwiched between the inner surfaces, and can then be firmly laminated by heating or pressure bonding.

Since the present invention has the above-described configuration, it is possible to continuously and consistently produce a composite film having a printed layer inside it from the film manufacturing stage, and it is also a method that can prevent wrinkles etc. in the film. Therefore, it can be suitably used in the production of food packaging materials and the like.

[Brief explanation of the drawing]

1 is a perspective view of a film reversing device used to carry out the method of the present invention, A in FIG. 2 is a schematic cross-sectional view of the film at A in FIG. 1, and B is a cross-sectional view of the film at B in FIG. It is a schematic diagram. 1, 2... film, 5, 6... peeling roll, 7, 8... reversing roll.

Claims (1)

[Claims] 1 The double polymerized films 1 and 2 are peeled off with two peeling rolls 5 and 6, and the films 1 and 2 are separated.
is advanced from the outside of the rolls into the roll gap of two reversing rolls 7 and 8 disposed intersectingly with respect to the traveling direction of the film, the front and back of each film is reversed, and then the films are laminated. A method for manufacturing a composite film.