JPH0780375B2 - Film laminated structure and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is particularly intended to protect a certificate with a photograph such as an identification card, a driver's license, a membership card and the like from stains and wetness. The present invention relates to a film laminated structure in which transparent plastic films are laminated on both front and back sides of a certificate, which can effectively prevent alteration of the certificate, and a manufacturing method thereof.

(Prior Art) As a conventional film laminated structure of this type, for example, there is one shown in FIG.

It is made of two thermoplastic transparent plastic films, such as polyethylene terephthalate film (PET) 1.
A paper 15 on which predetermined items are entered between a lower thermoplastic film 13 formed by laminating polyethylene (PE) 12 on 1 and an upper thermoplastic film 14 having the same structure, and this paper. Photo superimposed on part of 15
16 and sandwich the upper and lower thermoplastic film
Each of 14 is heat-bonded to each other at their peripheral portions, and is also heat-bonded to paper 15.According to such a laminated structure, paper 15 and affixed to the paper or No Photo 16 can be effectively protected from stains such as bending, dirt, and tears.

(Problems to be Solved by the Invention) By the way, in such a conventional technique, the thermoplastic plastic film 14 and thus the polyethylene 12
Of, the heat fusion to the paper 15 is performed under appropriate strength, but it is virtually impossible to heat-bond it to the photographic surface with sufficient adhesive strength. When the plastic film 14 is exfoliated afterwards as shown in FIG. 5, there is no part of the photographic surface remaining on the plastic film side, so there is no change in Photo 16, that is, alteration of the certificate. There was a problem that it would be extremely easy to carry out.

The present invention advantageously solves the above problems of the prior art, and is a film laminated structure capable of sufficiently preventing conversion of photographs, in other words, alteration of certificates, and
The present invention provides a method for producing a film laminated structure, which is suitable for producing the same.

(Means for Solving the Problems) The film laminated structure of the present invention is particularly advantageous in that the adhesive strength to a thermoplastic film is high when the thermoplastic transparent plastic film on the upper side and the photo have a high thermal adhesive strength to the photograph. It has an ink layer larger than the strength,
The manufacturing method of such a film laminated structure is such that a paper and a photograph are arranged on a lower thermoplastic film, and a thermoplastic resin on the upper side, which has been subjected to a required printing, is placed at a position facing the photograph. Covering those papers and photographs and thermally fusing each of the upper and lower thermoplastic transparent plastic films, the printed layer is more strongly heat-bonded to the photographic surface than to the upper thermoplastic transparent plastic film. .

(Operation) In the laminated structure of the present invention, it is difficult to strongly adhere the upper thermoplastic film itself to the photographic surface, but the adhesive strength of the ink layer to the photographic surface is higher than that of the upper plastic film. Since it is stronger than the adhesive strength of the above, by providing an ink layer on the plastic film beforehand, the ink layer always exists on the photograph in the authentic certification document in which the plastic films on the upper and lower sides are properly heat-sealed. However, if the upper and lower thermoplastic films are once peeled off, all of the ink layer will be present on the photograph, so the photograph is exchanged with another one for alteration and other purposes. Then, when the upper and lower plastic films are re-fused, the ink layer does not exist on the photograph.

Therefore, by checking the presence or absence of the ink layer on the photograph, it is possible to judge very easily whether or not the certificate is authentic.

Further, according to the method of the present invention, the laminated structure as described above can be manufactured simply and reliably. here,
When the surface of the printing layer provided on the upper thermoplastic film is subjected to a primer treatment to further enhance the adhesive strength of the printing layer to the photographic surface, the photographic surface at the time of peeling the upper and lower plastic films Adhesion of the print layer to the surface becomes more reliable.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.
Indicate the upper and lower thermoplastic transparent plastic films, respectively.

Here, these plastic films 1 and 2 can be formed into a laminated body of PET3 and PE4 as described in the conventional example, and the PE4 subjected to corona discharge treatment, P
ET laminated with ethylene acrylate copolymer (EEA), PET and PE laminated, ethylene-vinyl acetate copolymer (EVA), ethylene methacrylic acid copolymer (EMAA), ethylene ethyl acrylate (EAA)
Alternatively, it may be configured by laminating any of the ionomers.

Between the two plastic films 1 and 2 as described above, a paper 5 similar to that described in the conventional example and a photograph 6 superposed on a part of the paper 5 are arranged.
An ink layer 7 having a higher adhesive strength to the photograph 6 by thermocompression bonding than the adhesive strength to the plastic film 1 is disposed between the plastic film 1 and the plastic film 1.

The ink layer 7 is arranged, for example, as shown in FIG. 2, after the paper 5 and the photograph 6 are placed on the lower thermoplastic film 2, the surface facing the photograph 6 is
The upper thermoplastic film 1 on which the printing layer 7a according to need is preformed is covered, and then the upper and lower plastic films 1 and 2 are heat-bonded to each other and also to the paper 5. In doing so, the printed layer 7a can be extremely easily adhered to the surface of the photograph 6 by heat so that the ink for forming the printed layer 7a can be applied to the surface of the photograph 6 easily. PE, EVA, EMAA, EEA, EA in relation to physical properties
Using a completely different type of plastic film such as A, it has the property of not having adhesiveness with the plastic film as much as possible.For example, acrylic for PE, EVA, urethane for EMAA, EEA, EAA. A system is preferable.

Here, in order to make the adhesion of the print layer 7a to the photographic surface completely and sufficiently strong, it is preferable to subject the surface of the print layer 7a to a primer treatment, and as the ink, a urethane-based ink, Nitrified cotton type, chlorinated polypropylene type,
Acrylic type, and as the primer coating material, EAA material, EMAA material type, ionomer type, EAA type,
EVA based emulsions or dispersions can be used.

In the film laminated structure as described above, the ink layer 7 exists between the photograph 6 and the upper thermoplastic film 1 as shown in FIG. 1 when the film laminated structure is formed. Therefore, by checking the ink layer 7, it is possible to easily and accurately determine that the certificate is authentic.

On the other hand, when the upper and lower plastic films 1 and 2 are peeled off as shown in FIG. 3, the ink layer 7 becomes
Because of the strong adhesion between it and Photo 6, it completely remains on the surface of the photo, so if you change the photo 6 to something else, the ink layer 7 is removed and the plastic films 1 and 2 are removed. Ink layer 7 on the photo even after re-fusion
Can not be visually recognized, and therefore, it can be immediately recognized that the document is an alteration certificate.

(Effects of the Invention) Thus, according to the film laminated structure of the present invention, it is possible to very effectively prevent the alteration of the certificate including the photograph, and according to the method of the present invention, the required laminated structure can be obtained. It can be manufactured easily and surely.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating a manufacturing process of a film laminated structure, and FIG. 3 is a cross-sectional view showing a peeled state of a thermoplastic film. FIG. 4 is a cross-sectional view showing a conventional example, and FIG. 5 is a cross-sectional view showing a film peeling state of the conventional example. 1,2 …… Thermoplastic film 3 …… Polyethylene terephthalate film 4 …… Polyethylene, 5 …… Paper 6 …… Photograph, 7 …… Ink layer 7a …… Printing layer

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B42D 15/10 501 K A

Claims (3)

[Claims] 1. An upper and lower thermoplastic transparent plastic film, a paper disposed between these plastic films, and a photograph superposed on a part of this paper. It is a film laminated structure that is heat-sealed at the peripheral portions thereof and is also heat-sealed to the above-mentioned paper, and between the upper thermoplastic transparent plastic film and the photograph, the heat adhesive strength to the photograph is high. , A film laminated structure provided with an ink layer having a strength higher than that of thermal adhesion to a thermoplastic transparent plastic film. 2. A paper and a photograph overlapping a part of the paper are arranged on a lower thermoplastic transparent plastic film, and a printing layer is provided in advance on a portion of the paper and the photograph facing the photograph. When the upper and lower thermoplastic transparent plastic films are covered by a thermoplastic transparent plastic film on the upper side and the upper and lower thermoplastic transparent plastic films are heat-sealed, the printed layer is strongly heat-bonded to the photograph than to the upper thermoplastic transparent plastic film. A method for producing a characteristic film laminated structure. 3. The method according to claim 2, wherein the surface of the printed layer on the photograph side is subjected to a primer treatment.