JPS6039264Y2 - Sealing material containing hidden patterns - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealing material including a hidden pattern, and more particularly to a sealing material including a hidden pattern that can be distinguished under ultraviolet irradiation.

BACKGROUND ART Conventionally, it has been widely practiced to obtain printed matter to which a hidden pattern has been added and to make the hidden pattern appear by chemical or physical means when necessary.

The purpose of adding such a hidden pattern is, for example, to give the viewer a sense of surprise, to keep information secret from intermediate acquirers, or to connect the interest of even permanent acquirers. For this reason, it is preferable to temporarily not disclose hidden information, and furthermore, it may be necessary to prevent counterfeiting of various securities or cash vouchers.

In any case, in order to achieve these objectives, it is primarily important to prevent the viewer from detecting hidden patterns.

Printed matter using fluorescent ink is known for achieving this purpose.

Examples of such printed materials include those in which a hidden pattern is printed in a solid area or a ground pattern area using fluorescent ink.

In the case of this printed material, it is necessary to match the fluorescent ink with the ink of the surrounding solid areas and background pattern areas under white light and register during printing, which complicates the manufacturing process and makes mass production difficult. there were.

Furthermore, in the case of the above-mentioned printed matter, there was a drawback that the fluorescent ink only appeared to develop color in the normal printed area under ultraviolet irradiation and lacked contrast.

The present invention improves the drawbacks of conventional hidden pattern printed matter using fluorescent ink by combining a printing layer containing a fluorescent substance and a printing layer containing an ultraviolet absorber, and also improves ease of use. It is intended to give.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of a sealing material including a hidden pattern according to an embodiment of the present invention.

The sealing material of this example has an adhesive layer 2 and a release body 3 on the back surface of the support 1, and a printing layer 4 containing an ultraviolet absorber (hereinafter referred to as an absorbing printing layer) 4 on the surface of the support 1. A printed layer 5 containing a optical substance (hereinafter referred to as a fluorescent printed layer) 5 is provided, and a transparent plastic film 6 is further bonded to the surface thereof via an adhesive layer 7.

In this example, for example, the absorption printing layer 4 is entirely printed with ink containing a colorless ultraviolet absorber, and characters '
If the above-mentioned sealing material is formed by printing a positive pattern of DNP with ink containing a colorless fluorescent substance, it will be completely invisible under white light, and under ultraviolet irradiation, it will turn green-white rDNPJ.
The letters appear to be floating on the black background.

As described above, in the present invention, since the absorbing printing layer appears black under ultraviolet ray irradiation, the portion where only the fluorescent printing layer is provided stands out, revealing a hidden pattern with extremely high contrast.

In the present invention, the hidden pattern may be any of letters, numbers, background patterns, etc. (Furthermore, it is also possible to print continuous numbers on individual sealing materials.

In the present invention, a fluorescent dye or a fluorescent pigment is used as the fluorescent substance.

For example, zinc sulfide, zinc silicate, zinc cadmium sulfide,
Inorganic substances such as calcium sulfide and calcium tungstate; organic substances such as stilbene type, diaminodiphenyl type, imidazole type, thiazole type, coumarin type, and naphthalimide type, such as diaminostilbenzyl sulfonic acid, are used.

In addition, as ultraviolet absorbers, 2- (3', 5'-
Benzotriazole series such as alkyl-2'-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-3', 5'-ditashaIJ-butylphenyl)-5-''lolobenzotriazole;2゜2'-dihydroxy- 4-methoxybenzophenone, 2-hydroxy-
Benzophenone type such as 4-n octoxybenzophenone; Salicylic acid type such as phenyl salicylate, 4-t-butylphenyl salicylate; (2,2'-thiobis(4-t-, t-ctyl fert))-2- Nickel complex salts such as ethylhexylamine nickel H are used.

Binders used in the printing layer containing the fluorescent substance and ultraviolet absorber include water-soluble resins such as methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, polyvinyl alcohol, polyvinylpyrrolidone, casein, polyvinyl chloride, polyvinyl acetate, etc. Vinyl-based products such as vinyl chloride copolymer and polyvinyl butyral, acrylic-based products such as polymethyl methacrylate, polyethylene, polyamide, polyester, urethane-based products, rubber-based products,
Oil-soluble resins such as xylene resin, phenol resin, coumaron resin, and terpene resin can be used.

Usually, the same material is used for the absorbent printing layer 4 and the fluorescent printing layer 5, but this need not necessarily be the case.

The fluorescent printing layer 5 usually has a printing amount of 2 to IR/y4 (based on solid material).

The same applies hereinafter), and the content of the fluorescent substance in the printed layer 5 may range from 2 to 7% by weight.

Further, the absorbing printing layer 4 is usually provided with a printing amount of 0.5 to IOg/7F1', and the content of the ultraviolet absorber in the printing layer 4 may be in the range of 2 to 1% by weight.

These printing layers 4 and 5 are produced by adjusting ink with a viscosity suitable for printing using water or petroleum-based solvents that dissolve the respective solid vehicles, and applying it by any method such as gravure printing, offset printing, screen printing, letterpress printing, etc. It is formed by printing on a support.

Among fluorescent substances, fluorescent pigments are substantially insoluble in these solvents and form a dispersed layer in the ink.

Note that both printing layers can be colored in any desired color by adding a coloring agent.

The support may be transparent or opaque depending on the purpose, such as plastic film,
Examples include paper and metal foil.

Further, as the adhesive and the release body, those used in conventional sealing materials can be used.

In the embodiment shown in FIG. 1, a fluorescent printing layer 5 is patterned on the entire ultraviolet absorbing printing layer 4.

In the present invention, basically both printed layers are laminated, and only one of them is patterned, and the lamination order does not matter.

As described above, in the present invention, the absorbing printing layer appears black under ultraviolet irradiation, and the fluorescent printing layer in the areas where the absorbing printing layer is not laminated stands out, so that a hidden pattern with very high contrast can be obtained.

Furthermore, since the sealing material of the present invention has an adhesive layer 2, a hidden pattern can be easily obtained by peeling it off from the mold release body 3 and applying it as a seal to any object to be sealed 8 as shown in the second figure.

Therefore, the sealing material of the present invention can be used for toys such as patches and stickers, premium products, accessories, smoking utensils such as lighters, furniture, tableware, kitchen utensils, glasses, fountain pens, watches, optical instruments such as binoculars and telescopes, cameras, 8mm It is effective for product distribution management records, quality control records, etc. for the purpose of concealing information from intermediate acquirers of photographic equipment such as radio cassettes, electric equipment such as records, high-end golf clubs, etc.

In addition, stock certificates, gift certificates, gift certificates, checks, corporate bonds, stamps, stamps, bills, various identification cards, passbooks, membership tickets, invitation tickets, admission tickets, book tickets, beer tickets, raffle tickets, lottery tickets,
It is also effective in preventing counterfeiting of airline tickets, boat tickets, insurance certificates, other securities, slips, etc.

Example: A 20 μm roll of a permanent adhesive mainly composed of acrylic resin was applied to a 2-inch thick polyester film printed with an ultraviolet absorbing ink containing 2,2'-hydroxy-4-methoxybenzophenone using gravure printing. coat,
A 100 μm thick release paper treated with silicone is laminated to obtain a sealing material for the printing material.

After printing a pattern of 1 to 2 P thick fluorescent ink containing diaminostilbenzyl sulfonic acid on the above printing material sticker using letterpress printing, a 12/A thick polypropylene film coated with 10μ thick acrylic resin adhesive in advance is attached to the above. A desired sealing material is obtained by pasting onto the printed pattern.

This sealing material not only prevents the printed layer from being physically removed by laminating and laminating the film on top of the pattern printing, but also makes it completely impossible to tell that the pattern has been printed. It is something.

In addition, if transparency is not required (the material to which the sticker is attached may be partially obscured by the sticker), the film to be laminated on the pattern print may be a matte film (for example, 2-thickness matte polypropylene film). By laminating them together, the pattern printed layer becomes completely undetectable to the naked eye.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a sealing material including a hidden pattern according to the present invention. FIG. 2 is a schematic cross-sectional view showing how the sealing material is used. 1...Support, 2...Adhesive layer, 3.
...Mold release body, 4...Printed layer containing ultraviolet absorber, 5...Printed layer containing fluorescent substance, 6...
. . . Transparent plastic film, 7 . . . Adhesive layer, 8 . . . Object to be sealed.

Claims (1)

[Scope of utility model registration request] A fluorescent printing layer containing a fluorescent substance and an ultraviolet absorption printing layer containing an ultraviolet absorber are laminated on one side of the support, and a transparent plastic layer is further placed on top of these printing layers via an adhesive layer. A sealing material having a hidden pattern formed by laminating the supporting body and laminating a release body on the other side of the support with an adhesive layer interposed therebetween.