JPS6042027A - Manufacture of composite film - Google Patents

Abstract

PURPOSE:To produce a composite film having a printing layer inside suitable for food wrapping preventing wrinkling while continuously by peeling off and then, laminating doubly polymerized films after the inversion thereof from the surface to back thereof. CONSTITUTION:Doubly polymerized films (preferably, cylindrical inflation films folded clear of both end selvages) 1 and 2 are peeled off with two peeling rolls 5 and 6 and then, inverted from the surface to back thereof with two inversion rolls 7 and 8 so arranged to cross the films in the ongoing direction thereof. At this point, the films 1 and 2 are advanced to the roll clearance from outside the inversion rolls 7 and 8. The films thus inverted are laminated to obtain a desired film. When a printing layer 3 is used outside the film 1 and a film having an adhesive layer 4 outside the film 2, a film having a printing layer inside is obtained.

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, during the composite processing process of the composite film,
It is common practice to incorporate one of the pre-printed components with the printed layer on the inner surface of the composite film to increase the protection and aesthetic effect of the printed layer. 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,
There is a method of applying an adhesive to the other outer surface, winding it up onto a roll while polymerizing it, and then peeling off the outer end of the wound film and rewinding it so that the printed layer is on the inner surface.

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

The present invention has discovered a method capable of solving the above-mentioned drawbacks. /, λ is advanced from the outside of the rolls into the roll gap between two reversing rolls 7 arranged intersectingly with respect to the traveling direction of the film, the front and back of each film are reversed, and then laminated. The present invention is characterized by a method for manufacturing a composite film.

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

FIG. 1 is a perspective view of a film reversing device used for carrying out the method of the present invention.
(B) is a schematic cross-sectional view at B of the film in FIG. 1.

The double polymerized films in the present invention may be of different types, but the same type of film obtained by folding a cylindrical blown film and removing the edges at both ends is suitable for continuous production. It is advantageous if

Each film/2 may itself be a laminated film in which multiple layers are adhesively integrated.

The above polymerized film is provided with a printing layer 3 on the outside of the film and an adhesive layer≠ on the outside of the film, as shown in tA) in FIG.

The printed layer 3 can be provided by a normal gravure printing method, and the twisted adhesive layer can be provided by a normal dry laminating adhesive by 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.

Then, the film 2 is peeled upward and downward using a peeling roll. The peeling rolls J and B are drive rolls whose rotational speeds can be changed.

The rotation speed may be determined depending on the production speed of the final composite film. Peeled film/, λ is reversing roll 7
, g to turn the film upside down. The reversing rolls 7 and g are disposed vertically and parallel to each other at an angle of about t30 with respect to the direction in which the film travels from the peeling roll coater.

The reversing roll is also a driving roll like the peeling roll.

The front and back sides of the film can be reversed by advancing the film / and λ from the outside of the reversing roll into the roll gap.

Providing a large number of air holes in the reversing rolls 7, g and discharging compressed air from the air holes to reduce the frictional resistance between the film and the roll is effective in preventing wrinkles in the film. The film after inversion has a structure in which the printed layer and the contact layer are sandwiched between the inner surfaces, as shown in (Bl) in FIG. 2, and can be firmly laminated by heating or pressure bonding.

Since the present invention has the above-mentioned configuration, it is possible to continuously and consistently produce a composite film having a printed layer inside from the film manufacturing stage, and it is possible to prevent wrinkles etc. from forming in the film. This method can be suitably used for manufacturing food packaging materials, etc.

[Brief explanation of the drawing]

FIG. 7 is a perspective view of a film reversing device used for carrying out the method of the present invention, (A) in FIG. 2 is a schematic cross-sectional view of the film at A in FIG. This is a schematic cross-sectional view at /,!... Film 5.6 Peeling Girolla,
g...Reverse roll Akira 1 Figure 2 Figure (B)

Claims (1)

[Claims] The double-polymerized films (1) and (2) are peeled off with a λ book peeling roll (1) and (B), and the films (1) and
(U) is advanced into the roll gap from the outside of the rolls of two reversing rolls (7) (7) arranged intersectingly with respect to the traveling direction of the film (J'>, to reverse the front and back of each film, A method for producing a composite film, which comprises laminating the film after a certain amount of time.