JPH1178307A - Double-spread confidential postcard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optimum release force in place of a confidential postcard of heat-sensitive pressure fixing type or pressure-sensitive pressure fixing type formed by interposing a pseudo-bonding film heretofore available. SOLUTION: A confidential postcard is so constituted as to overlap at least two confidential postcard bases 1 and bond them together releasably so that a display face of an information printed section 2 is formed on an inner face. In that case, releasable dot printing 3 using releasable ink is applied on one face opposite to a bonding face. Also a heat-sensitive pressure fixing type bonding agent 4 or a pressure-sensitive pressure fixing type bonding agent is applied on both of the bonding faces facing each other, and the display faces of respective information printed sections 2 are folded into two facing each other and bonded thereon releasably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spread confidential postcard that provides an optimum peeling force in place of a thermo-compression type or pressure-sensitive type confidential post card which is implemented through a conventional pseudo adhesive film.

[0002]

2. Description of the Related Art Conventionally, there have been many proposals concerning a spread confidential postcard. As a bonding means, a technique of sandwiching a pseudo-adhesive raw material film between two films and heating and pressing the same (Japanese Utility Model Application Laid-Open No. 62-9280). Japanese Patent Application Laid-Open No. 61-28679. A technique for adhering a transparent release sheet to a transparent release sheet with an adhesive (Japanese Utility Model Laid-Open Publication No. 61-28679.) Technology to apply directly to the surface to be pseudo-bonded
No. 2044. Postcards) are known.

[0003]

However, it is common to these technologies that the peeling force depends exclusively on the material used for the material and depends on the performance of the material. However, it was not possible to sufficiently cope with the characteristics of the paper or film, and as a result, it was not possible to obtain a desired optimum peeling force.

[0004] Further, when the prior art is searched for, a technique for adjusting the peeling force by applying an adhesive to one surface of a two-page spread confidential postcard (Japanese Utility Model Application Laid-Open No. 7-12262. Polymerization having concealing properties). Paper strip) is known, but it is a technique of providing an appropriate peeling force by applying a release type halftone printing using a release ink, which is a feature of the present invention described later, and applying an adhesive to the upper surface thereof. They are essentially different.

Also, a confidential postcard technology (Japanese Utility Model Laid-Open No. 3-67) is to fold the postcard paper so that the confidential surfaces face each other and to adhere the confidential surfaces to each other in a peelable manner.
No. 098. Confidential postcard), which is formed on one confidential surface by forming a quasi-adhesive layer that is peelably pressed against the other confidential surface, and on the other confidential surface, a transparent adhesive layer that prevents the quasi-adhesive layer from being pressed. Such a release material is applied in a shaded manner.

However, it is necessary to form a thermocompression bonding layer simultaneously on the surface opposite to the coated surface of the silicone halftone dot disclosed in the same technology at the time of manufacturing, and the thermocompression bonding layer and the paper surface on the opposite surface are in contact with each other. Difficult, high pressure required for bonding, risk of paper fiber migration to the opposite side if peeled after crimping, or necessity of additional facilities and equipment, negligible in terms of economy There are difficult problems. On the other hand, the present invention overcomes the above-mentioned problems and exerts remarkable excellent effects as described later.

[0007]

More specifically, the structure of the spread confidential postcard according to the present invention will be described in detail. At least two confidential postcard base materials are superimposed on each other so that the information printing unit display surface is located inside. In the spread facing confidential postcard,
On one surface of the adhesive opposing surface, a release type halftone printing using a releasable ink is performed, and both sides of the adhesive opposing surface are coated with a thermo-compression bonding type or a pressure-sensitive bonding type adhesive so that the information printing unit display surfaces face each other. It is folded and adhered as two folds to make it peelable.

In the present invention, it is also preferred that the confidential postcard substrate is used as a reciprocating postcard.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a spread confidential postcard which provides the best results of the present invention. FIG. 1 is an explanatory view schematically showing the overall configuration of a confidential postcard in a developed state, FIG. 2 is an explanatory view showing a state in which the confidential postcard is folded and bonded from the state of FIG. 1, and FIG. FIG. 5 is an explanatory diagram showing a state where the adhesive is peeled between the adhesive and the adhesive and between the adhesive layers continuous with the adhesive.

In the drawings, reference numeral 1 denotes a confidential postcard base material, which is preferably of paper quality such as coated paper or high-quality paper. However, in the practice of the present invention, the paper quality is not particularly limited. It must be within the required range for postcards specified in the Postal Law. Reference numeral 2 denotes an information printing unit, in which a secret information article indicating a loan loan limit of a specific individual from a financial institution and solicitation thereof is displayed on the inside of the confidential postcard substrate 1. Reference numeral 3 denotes peeling halftone dot printing. The term "removable halftone printing" as used in the present invention means generally well-known halftone printing using a releasable ink.

The term "peelable ink" as used herein means an ink capable of forming a film which is unfamiliar with recoating properties, and specifically, an offset ink containing a silicone resin or a pigment containing a silicone element as a component. Printing inks and offset printing inks containing a fluororesin or a fluorine element-containing pigment as a constituent element are exemplified.

The dot printing performed in the present invention will be described in detail below. The spread confidential postcard of the present invention is intended exclusively for commercial and business use, and is realized in a continuous form format under so-called form printing from the viewpoint of mass productivity and economy. In the form printing, generally coated paper or woodfree paper (belonging to uncoated paper, is a paper without whiteness,
Although 100% chemical pulp is used, the quality of high-quality paper is reduced by reducing the amount of white clay pigments due to the characteristics of form printing, and care is taken to avoid damage to punches for sprocket holes and horizontal sewing blades.

The number of halftone dots printed on the coated paper or the high-quality paper is usually 65, 85, 100, 15 or less.
0 or 175 lines (150 lines or less in color printing) are used. In the embodiment of the present invention, 150 lines were selected as the number of lines for halftone printing with the release ink. In addition, when printing such as halftone printing by winding, it is likely that accidents such as set-off and blocking occur in the post-processing stage, and therefore, UV curable ink is used in business forms (BF) and seal printing. Is suitable, and the same ink is used in the present invention. The ink does not penetrate into paper or the like, but emits ultraviolet rays (ultraviolet).
rays. (Abbreviation: UV) is rapidly used and rapidly solidified by irradiation, and is often used because it is solidified and judged to be suitable for business form printing.

Reference numeral 4 denotes a thermo-compression bonding adhesive, which is coated on the entire upper surface of the peeling halftone print 3 in the present invention, and has a preferable coating thickness of about 5 μm (micrometer). In the description of the present invention, the thermocompression-bonding adhesive 4 has been described. Alternatively, a pressure-compression bonding adhesive may be used. Specifically, a well-known solvent-soluble pressure-sensitive adhesive is used. Alternatively, a water-soluble pressure-sensitive adhesive may be used. This kind of pressure-sensitive pressure-sensitive adhesive has been evaluated for its use, especially since there is no adhesive residue after peeling.

[0015]

【Example】

Example 1 Halftone dot printing was performed on the coated paper under the following conditions using the following peelable ink. Offset printing 120 W / square centimeter 2,500 sheets / hour Peelable ink Silicone resin type ultraviolet curing ink (X-62-7052 [trade name], manufactured by Shin-Etsu Silicone Co., Ltd.) Printing dot 150 lines / inch The dot printing is performed. A solvent-type heat sealing material was applied to the entire upper surface using a wire bar # 26. Heat sealing material Solvent-type thermo-compression bonding adhesive (Dick Seal A-100 ES21 Rev.2 [trade name], NV 27%, manufactured by Dainippon Ink and Chemicals, Inc.) Drying condition 80 ° C. for 1 minute A heat sealing material was applied on the coated paper having a thickness of about 5 μm as described above. The above-mentioned heat seal material was folded in two and superimposed, and heated and pressed by a heating roll at about 100 ° C. Results A peel test between the paper surfaces was performed on the paper prototype produced under the above conditions under the area ratio of the halftone dots shown in Table 1 (the area of the halftone dots occupying a certain area is indicated by a ratio (%)). Was.

[0016]

[Table 1]

Example 2 Halftone dot printing was performed on coated paper (86 μm thick, sheet) under the following conditions using the following release ink. Offset printing 120 W / square centimeter 2,500 sheets / hour Peelable ink Silicone pigment type UV curable ink (Hakuri wet op varnish [trade name], manufactured by T & K Toka Co., Ltd.) Printing halftone 150 lines / inch Perform the above halftone printing The entire upper surface was coated with a solvent-type heat sealing material using a wire bar # 26. Heat sealing material Solvent-type thermo-compression bonding adhesive (Dick Seal A-100 ES21 Rev.2 [trade name], NV 27%, manufactured by Dainippon Ink and Chemicals, Inc.) Drying condition 100 ° C. for 1 minute Coating film A heat sealing material was applied to the coated paper having a thickness of about 5 μm as described above. The above heat-sealing material was folded in two and superimposed, and heated and pressed by a heating roll at about 85 ° C. Results With respect to the paper prototype produced under the above conditions, a peel test between the paper surfaces (measuring 90 ° peel strength; head speed 300 mm / min) was performed under the area ratio of the halftone dots shown in Table 2.

[0018]

[Table 2]

From the above results, it was confirmed that the peeling force could be controlled by peeling halftone printing even when the same kind of thermocompression bonding adhesive was used. Thus, by performing the peeling halftone printing in the final unit of the conventional BF offset printing machine, the subsequent application, for example, by simply using a gravure unit and applying a thermo-compression bonding adhesive, so far, It is possible to manufacture a double-faced confidential postcard having the effects described below without using a pseudo-adhesive film and by eliminating the above-mentioned drawbacks which have been regarded as problems with the use of the film.

[0020]

According to the present invention having the above configuration, the following effects can be obtained. That is, according to the first aspect of the present invention, it is possible to provide a thermocompression-bonding type or pressure-sensitive compression-type confidential postcard without using a special pseudo-adhesive film, a release sheet, or a heat-sensitive fusion type sheet. The peeling force can be easily adjusted by simply changing the area ratio of the peeling halftone printing without requiring careful investigation or consideration of the ink combination. According to the second aspect of the present invention, in addition to the effect of the first aspect, since various films are not used, a person who intends to reply can fill in the entry field in the postcard with a ballpoint pen or the like. Can be provided.

Further, by using the release type offset ink in the offset printing line, the offset printing unit which is currently used for overcoating can be directly used and manufactured. Therefore, just adding one coating unit to the current production line,
A thermo-compression type confidential postcard can be manufactured. Offset printing of the release ink of the present invention is an extension of ordinary offset printing for overcoating. Therefore, even if the processing is performed, the printing state of the normal printing surface is not significantly impaired, and this indicates that a confidential postcard of full-color printing can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing an overall configuration of a confidential postcard in a developed state.

FIG. 2 is an explanatory view showing a state of being folded and adhered from the state of FIG. 1;

FIG. 3 shows, after peeling, between the peelable ink and the adhesive;
Explanatory drawing showing a state in which the adhesive layer is peeled between adjacent adhesive layers

[Explanation of symbols]

 1 confidential postcard base material 2 information printing section 3 peeling halftone printing 4 thermo-compression adhesive

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shuichi Inaba 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Kyodo Printing Co., Ltd. (72) Inventor Hirofumi Yata 4- 14-12 Koishikawa, Bunkyo-ku, Tokyo Kyodo Printing Inside (72) Inventor Hitoshi Otomo 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Kyodo Printing Co., Ltd. (72) Inventor Kiyoshi Kitahara 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Kyodo Printing Co., Ltd.

Claims (2)

[Claims] 1. A spread confidential postcard in which at least two pieces of a confidential postcard are superimposed and releasably adhered such that the display surface of the information printing section is on the inside, and a peelable ink is used on one surface of the opposing adhesive surface. While applying peeling halftone printing, apply thermo-compression bonding type or pressure-sensitive bonding type adhesive on both sides of the adhesive facing surface, fold and bond the information printing unit display surfaces as two folds facing each other, peel and peel A two-page spread confidential postcard that is made possible. 2. The spread confidential postcard according to claim 1, wherein the confidential postcard base material is used as a reciprocating postcard.