JPH0418078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing securities paper, in which a visible or invisible pattern is applied to a water-soluble film by letterpress, offset, or intaglio printing, and the films are combined at the papermaking stage.

[Problems with conventional technology]

It is well known that many security measures are taken to prevent unauthorized forgery or alteration of securities such as banknotes, securities, identification cards, and passports. Polka dots,
Colored fibers and security threads are used to maintain a high level of reliability. Colored paper and woven paper techniques are also effective safety measures. For example, British Patent No. 4419 (1819
Laminated paper with colored or printed intermediate layer (Japanese Patent Publication No. 49-36043) describes a dyeing method in which dye is mixed with starch or polymer synthetic paste in the middle of two layers and penetrates into the surface layer of the paper. , Utility Model Publication No. 49-14965 discloses a pseudo-voke paper in which a plastic film printed in multiple colors is inserted. If these known intermediate layers of paper, plastic film, and glue are present, the appearance and paper quality characteristics of securities paper cannot be obtained, and the evidence of the addition of the intermediate layer is easily discernible, so it is not always possible to ensure complete counterfeit prevention. No, no.

[Purpose of the invention]

From the above points of view, the present invention provides a method of dissolving the moisture contained in the wet paper produced in the papermaking process between the paper layers of the wet paper.
A water-soluble film with a design applied to the film surface by letterpress printing, offset printing, or intaglio printing using ink that is colored or has the function of photoluminescence, photochromic, or thermochromic is inserted, and the design on the film is transferred into the paper layer. The purpose of the present invention is to provide a method for manufacturing securities paper.

[Summary of the invention]

The present invention is a method for producing securities paper which has a unique interlayer effect and has no intermediate layer by imparting the functionality of light emission, photocolor change, and thermal color change in addition to multicolor printing using a printing method on a water-soluble film. .

[Details of the invention]

The present invention is based on a buried synthetic resin film piece (thickness
10~30μm) is the moisture content of wet paper (approximately 60~70%)
This invention relates to a method for producing securities paper, which is completely dissolved by heating (approximately 60 to 80 degrees Celsius or less) and embeds only the printing lines within the paper layer.

The water-soluble and light-transparent synthetic resin used in the present invention is polyvinyl alcohol (hereinafter referred to as
The solubility in water is mainly controlled by the degree of saponification. PVA is a crystalline polymer, and its partially saponified product with weak hydrogen bonds in OH groups has the characteristic that it completely dissolves at a relatively low temperature (approximately 60°C) and easily becomes molecularly dispersed. In addition, there are other water-soluble polymer materials such as polyvinyl ether, polyvinylpyrrolidone, and carboxymethyl cellulose, which have film-forming properties, adhesive properties,
Saponification degree is 80~ from the viewpoint of economy, printing and papermaking workability.
Use PVA film belonging to 95 mol% partially saponified product.

A small piece of the film (e.g., approximately 3 x 3 cm) or a roll film is provided with a detailed pattern by, for example, multicolor process printing or gravure printing, and this is inserted between wet paper sheets to create a paper sheet. It shows print quality (sharpness, line reproducibility) equivalent to or better than that of printing with moisture set type or oil-based ink, and there is no separation between the front and back sides of the paper, and the presence of an intermediate layer cannot be identified. A difficult plowing effect can be obtained. In addition, the paper has almost no transparency in the inserted part of the PVA film, and the transparency is similar to that of the non-inserted part, so there is no discomfort due to insertion, and the multicolored "watermark pattern" created by the interlacing can be observed with the naked eye. It is possible to obtain a security paper having a high degree of anti-counterfeiting property that allows immediate and easy determination of authenticity.

Furthermore, the printing ink can have functionality, such as fluorescent or phosphorescent material that emits light when excited by ultraviolet rays, photochromic material that changes color due to light, thermochromic material that changes color due to heat, etc., as an ink pigment, resulting in "hidden printing" or "colored printing." can also be imparted to the film, and such a matching effect exhibits a combined effect of the watermark's visibility and functionality, making it possible to obtain securities paper having higher anti-counterfeiting properties.

〔Effect of the invention〕

The securities paper manufactured according to the present invention does not cause separation of the paper because the film inserted between the paper layers completely dissolves during the papermaking stage, and it is easy to counterfeit by adding elaborate designs and functional materials by printing. It is extremely useful for preventing counterfeiting and alteration, since it is difficult to reproduce the interlocking effect that accompanies alteration.

〔Example〕

Next, examples of the present invention will be shown, but the present invention is not limited thereto. Note that the parts or percentages shown below are based on weight.

Example 1 [Paper stock liquid] Softwood kraft pulp 35 parts Hardwood kraft pulp 60 parts White clay (manufactured by Fujilight Industries, on white clay) 5 parts Sizing agent (manufactured by Arakawa Chemical, Size Pine E) 1 part Sulfuric acid band (manufactured by Sumitomo Chemical, aluminum sulfate)
3 parts Internal adhesive (manufactured by Arakawa Chemical Co., Ltd., Polylon 191) 0.5 parts Two sheets of wet paper with a basis weight of 40 g/m ² were made using a paper stock liquid with the above composition and a Tappi sheet machine, and the size was 2.4 in advance. ×2.4cm, 9μm thick water-soluble polyvinyl alcohol film (manufactured by Kuraray, warm water soluble type)
Ink for process printing (manufactured by Dainippon Ink,
DIC) was used to print a blue mark pattern, and this was inserted between wet paper sheets, followed by pressurization, dehydration, and drying to obtain the securities paper of the present invention. This paper has a clear blue mark pattern that is visible on both the front and back sides under sunlight or illumination light, and there is no change in appearance due to scraping, and the printing effect is similar to that of colored printing on the inner surface of wet paper. It also had an anti-counterfeiting effect.

Example 2 [Ink] Orange pigment (Dainichiseika Chemical Co., Ltd., lead-free orange) 20 parts Varnish (Dainippon Ink Chemical Co., Ltd., MG-76) 79.9 parts Desiccant (Wako Pure Chemical Industries, Ltd., manganese borate) 0.1 part The above example 1. Pre-size 2.4 on two sheets of wet paper.
x 2.4 cm, 20 μm thick water-soluble polyvinyl alcohol film (manufactured by Nichigo Film, cold water soluble type).
Print an orange mark pattern with ink of the above composition,
This was inserted between wet paper sheets, pressurized, dehydrated, and dried to obtain the securities paper of the present invention. This paper has a clear orange mark pattern on both the front and back under sunlight or illumination light, and the same mark pattern is visible under ultraviolet light, and there is no change in appearance due to gaps, and colored fluorescent printing is printed on the inner surface of the wet paper. In addition to showing a printing effect similar to that of the original printing method, it also had an anti-counterfeiting effect.

Example 3 [Ink] Phosphor (manufactured by Toshiba, ZnS:Mn) 35 parts Varnish (manufactured by Dainippon Ink Chemical, MG-76) 64.9 parts Desiccant (manganese borate, manufactured by Wako Pure Chemical Industries) 0.1 part Above Example 1 Pre-size 2.4 on two sheets of wet paper.
x 2.4 cm, 20 μm thick water-soluble polyvinyl alcohol film (manufactured by Nichigo Film, cold water soluble type).
Print a colorless mark pattern with ink of the above composition,
This was inserted between wet paper sheets, pressurized, dehydrated, and dried to obtain the securities paper of the present invention. This paper cannot be seen with the naked eye due to the invisible mark pattern on both the front and back under sunlight or illumination light. However, under ultraviolet light, the mark pattern is visible due to orange fluorescence, and there is no change in appearance due to alignment, and the printing effect is similar to that of colorless fluorescent printing (hidden printing) on the inner surface of wet paper. In addition to this, it also had an anti-counterfeiting effect.

Example 4 Using a cylinder paper machine (grammage of one layer: 40 g/m ² ) capable of combining two layers with the paper stock liquid of Example 1, the paper stock liquid of Example 3 was prepared in advance just before the two layers overlapped. A water-soluble polyvinyl alcohol film (manufactured by Kuraray, warm water soluble type) printed with ink and having a width of 2 to 3 cm and a thickness of 9 μm is continuously inserted in the paper making direction, and through pressing, drying, and calendering steps, the film of the present invention is produced. I got the securities paper. This paper is the same as in Example 3, and has a printing effect similar to that of making invisible mark patterns visible under ultraviolet light and colorless fluorescent printing (hidden printing) on the inner surface of wet paper, and also prevents counterfeiting. It was also effective.

[Brief explanation of drawings]

FIG. 1 is an enlarged view of the cross section of the paper when the paper layers according to the present invention are interlaced, and FIG. 2 is an enlarged view of the cross section of the paper, in which 1 and 2 are paper layer parts, 3 is a water-soluble film, and 4 is an enlarged view of a cross section of paper. Shows the printed section.

Claims (1)

[Claims] 1. A water-soluble polymer material in which a pattern is applied between the wet paper layers by letterpress printing, offset printing, or intaglio printing using colored ink or ink that has the function of photoluminescence, photochromic change, or thermochromic color change, and a pattern is applied to the film surface. A method for producing securities paper, which comprises inserting a polyvinyl alcohol film and forming a pattern within a paper layer.