JPH07242079A - Postcard for confidential purpose - Google Patents

Abstract

PURPOSE:To provide a postcard for confidential purpose, in which confidential pages facing each other cannot be pseudo-bonded again, once the faces of confidential pages are peeled off. CONSTITUTION:A postcard 10 in which confidential pages 10a and 10b are so folded as to face each other and the confidential pages 10a and 10b are pseudo-bonded in a manner of being able to peel off, heat bonded resin layers which can be bonded between the confidential faces 10a and 10b are formed on both faces of a film-like transparent base clamped between the confidential pages 10a and 10b facing each other, and a release layer is formed between the base and one of the heat bonded resin layers, while an anker layer is formed between the base and the other side of the heat bonded resin layers. Respective heat bonded resin layers are bonded on the base by the bonding force of bonding strength less stronger than the bonding force to the confidential pages 10a and 10b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a confidential postcard, and more particularly, it is completed by folding postcard paper so that the confidential surfaces face each other and pseudo-adhesively attaching the confidential surfaces to each other. Regarding postcards.

[0002]

2. Description of the Related Art Conventionally, as a postcard of this type, two transparent resin films, which are thermocompression-bonded to each other on the surface of the postcard, are heat-sensitive to each other with an adhesive force smaller than the bonding strength to the surface. Those that are pseudo-bonded so that they can be peeled off by being bonded have been published. However, in these known techniques, after peeling off the confidential surfaces, the confidential surfaces are brought into contact with each other and thermocompression bonded to each other, so that pseudo-adhesion is possible, and information that should not be known to a third party is written on the confidential postcard. The problem remains.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems as a confidential postcard, and once the confidential surfaces are peeled off, it is impossible to re-pseudo-bond them again. The purpose is to provide.

[0004]

In order to achieve the above-mentioned object in the present invention, in the first invention, the postcard paper can be folded so that the confidential surfaces face each other, and the confidential surfaces can be separated from each other. In a confidential postcard, which is pseudo-bonded to each other, heat-adhesive resin layers that can be bonded to the confidential surface are formed on both sides of a film-like transparent base material that is sandwiched between mutually facing confidential surfaces. A release layer is formed between one of the base material and the heat-adhesive resin layer, and an anchor layer is formed between the other one, and each of the heat-adhesive resin layers has an adhesive force smaller than the adhesive strength to the confidential surface. The postal card for confidential use is characterized by being adhered to the base material.

According to the second aspect of the present invention, in a confidential postcard in which the postcard sheets are folded so that the confidential surfaces face each other, and the confidential surfaces are pseudo-adhesively attached to each other in a peelable manner, between the confidential surfaces facing each other. On both sides of a film-like transparent base material to be sandwiched, a heat-adhesive resin layer capable of adhering to the confidential surface is formed, and between the base material and one of the heat-adhesive resin layers, a silicone resin or a fluororesin is used. A peeling layer is formed, and an anchor layer is formed between the other ones, and each of the heat-adhesive resin layers is bonded to the base material with an adhesive force smaller than the adhesive strength to the confidential surface. It is a characteristic postcard for confidential use.

[0006]

As described above, according to the present invention, the peeling layer is formed between the film-like transparent base material and the heat-adhesive resin layer. Therefore, when the confidential surfaces are peeled off, they peel off from the peeling layer and once peeled off. Even if the confidential surfaces are thermocompression bonded, the confidential surfaces will not be pseudo-bonded again.

According to the second aspect of the invention, since a layer made of a silicone resin or a fluororesin having an excellent peeling effect is used as the peeling layer, even if the peeled confidential surfaces are thermocompression-bonded to each other, they are protected. There is no possibility that the surfaces will be pseudo-bonded again.

[0008]

The present invention will be described in detail below with reference to the drawings. In the present invention, as shown in FIGS. 1 and 2, the postcard paper (10) is folded in two and is opposed to each other.
A separator (20) cut into the same size as the parent surface is sandwiched between a and 10b). The separator (20) is a base material (3) made of a plastic film such as polypropylene or polyester.
The release layer (31), which has been subjected to a release treatment with a silicone resin or a fluororesin on one side of (0), is subjected to corona discharge treatment for making fine scratches in order to adhere the adhesive layer to the other side, or An anchor layer (32) made of polyester resin or the like is formed, and a vinyl acetate-based, polyester-based or polyurethane-based adhesive resin having a low melting point is applied to the upper layers on both surfaces of the anchor layer and dried. hand,
Adhesive layers (33a, 33b) made of the solid polymer are formed. The separator (20) thus produced is sandwiched between postcard sheets (10) folded in two so that the confidential surfaces (10a, 10b) face each other, and the temperature is 120 to 200 ° C (desirably 140 to 15 ° C).
0 ° C), pressure 5 kg / cm ² or less, time 0.5-
The confidential postcard of the present invention is completed by thermocompression bonding under the condition of 2 seconds.

<First Embodiment> A more specific description will be given. A transparent polyester film having a release layer (31) that has been subjected to a release treatment with a silicone resin on one surface in advance (a polyester film that has been subjected to a release treatment by Lintec Co., Ltd., the base is Lumirror S type thickness manufactured by Toray Industries, Inc. Two
(5 μm) untreated surface, varnish made of polyester resin (Toyoku Ink Mfg. Co., Ltd. Lamister R
Beam) at the first unit of the conventional gravure coater, so that the coating amount is 0.2 to 2.0 g / m ² (preferably 0.5 g / m ²⁾ in terms of solid content, gravure plate depth ,
Anchor layer (32) by adjusting the solid content of varnish and applying it
And In the second unit, a varnish made of polyurethane-based resin (New LP Super R Medium manufactured by Toyo Ink Mfg. Co., Ltd.) was applied on the anchor layer in a solid content of 1.5 to 4.0 g / m ² (desirably). Is 3.0 g
/ M ² ), the plate depth of the gravure plate, the solid content of the varnish, etc. are adjusted and applied to form an adhesive layer (33b). In the third unit, the same amount of varnish used in the second unit is applied on the release layer (31) in the same amount.
That is, the varnish (manufactured by Toyo Ink Mfg Co., Ltd. New LP Super R Mejumu) 1.5 to 4.0 g / m ² coating weight with solids (desirably 3.0 g / m ²⁾ made of polyurethane resin The coating depth of the gravure plate and the solid content of the varnish, etc.
a). At this time, the melting point of the polyurethane resin is 90
The one showing -100 ° C was used.

The degree of release of the silicone-treated polyester film was measured as follows. An adhesive (BPS-512 manufactured by Toyo Ink Mfg. Co., Ltd.) was applied to the processed surface of a silicone-processed polyester film (polyester film thickness 25 μm processed by Lintec Co., Ltd.)
20 g / m ² of 7) is applied as a solid content. An untreated polyester film (Lumirror thickness 25 μm manufactured by Toray Industries, Inc.) is attached to this adhesive-coated surface, and the temperature is 23 ° C. and 65% R.
Leave for 24 hours under H environment. After that, when it was peeled at 180 ° at a speed of 300 mm / min, the peel strength between the silicone-treated surface and the pressure-sensitive adhesive surface showed a value of 10 g / 50 mm, which proved that the releasing effect was good.

The separator (2
0) is sandwiched between ^two postcard sheets (10) having a basis weight of 104.7 g / m ² and a temperature of 150 ° C. and a pressure of 0.5.
Under the conditions of kg / cm ² and time of 2 seconds, a normal press machine is used for thermocompression bonding. When the postcard paper (10) is taken out from the press machine and cooled, the postcard paper (10) is peeled off between the release layer (31) and the adhesive layer (33a) as shown in FIG. 2 (b). This was again applied to a press machine under the conditions of a temperature of 150 ° C., a pressure of 0.5 kg / cm ² , and a time of 2 seconds, and was heated and pressed, but there was no re-adhesion.

As the postcard paper (10), a postcard twice as large as the postcard paper (10) is used.
0) may be sandwiched and thermocompression-bonded to create the confidential postcard of the present invention. If the postcard paper (10) is twice as large as the postcard paper in this way, registration becomes unnecessary in the step of sandwiching the separator (20).

[0013]

According to the present invention, since the release layer is formed between the film-like transparent substrate and the heat-adhesive resin layer,
When the confidential surfaces are peeled off, they are peeled from the peeling layer, and even if the once peeled confidential surfaces are thermocompression bonded, the confidential surfaces do not pseudo-adhere again. Therefore, even if information that the third party does not want to be known to the third party is described, once the third and second confidential pages are peeled off, the second and third parties will not be pseudo-bonded to each other. If you look at the information, you can see it immediately and have the effect of fully fulfilling the role of a confidential postcard.

According to the second aspect of the invention, since a layer made of silicone resin or fluororesin having excellent peeling effect is used as a peeling layer, even if the peeled confidential surfaces are thermocompression-bonded to each other, they are protected. There is no possibility that the surfaces will be pseudo-bonded again. Therefore, even if information that the third party does not want to be known to the third party is described, once the third and second confidential pages are peeled off, the second and third parties will not be pseudo-bonded to each other. If you look at the information, you can see it immediately and have the effect of fully fulfilling the role of a confidential postcard.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 (a) is a sectional view of the same embodiment of the present invention. (B) It is sectional drawing which shows the peeled state of the Example of this invention.

[Explanation of symbols]

 10 ... postcard paper (10) 10a ... confidential surface (10a) 10b ... confidential surface (10b) 20 ... separator (20) 30 ... base material (30) 31 ... release layer (31) 32 ... anchor Layer (32) 33a ... Adhesive layer (33a) 33b ... Adhesive layer (33b)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masami Taki 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd.

Claims (2)

[Claims] 1. A confidential postcard in which postcard paper is folded so that the confidential surfaces face each other, and the confidential surfaces are pseudo-adhered so that the confidential surfaces can be separated from each other. A film shape sandwiched between the confidential surfaces facing each other. On both sides of the transparent substrate of
A heat-adhesive resin layer capable of adhering to the confidential surface is formed, and a release layer is formed between one of the base material and the heat-adhesive resin layer,
An anchor layer is formed between the other ones, and the respective heat-adhesive resin layers are bonded to the base material with an adhesive force smaller than the adhesive strength to the confidential surface. . 2. The confidential postcard according to claim 1, wherein the release layer is a silicone resin or a fluororesin.