WO2019054207A1 - Multilayer paper and method for producing same - Google Patents

Multilayer paper and method for producing same Download PDF

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Publication number
WO2019054207A1
WO2019054207A1 PCT/JP2018/032440 JP2018032440W WO2019054207A1 WO 2019054207 A1 WO2019054207 A1 WO 2019054207A1 JP 2018032440 W JP2018032440 W JP 2018032440W WO 2019054207 A1 WO2019054207 A1 WO 2019054207A1
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Prior art keywords
paper
paper layer
multilayer
watermark
layer
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PCT/JP2018/032440
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French (fr)
Japanese (ja)
Inventor
智規 杉山
大輔 岩間
嘉彦 福室
昌明 須山
真太郎 二村
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特種東海製紙株式会社
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Publication of WO2019054207A1 publication Critical patent/WO2019054207A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/24—Passports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/333—Watermarks
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes

Definitions

  • a pseudo-watermark is formed by printing on a sheet using a substance that penetrates a sheet such as paper to increase the light transmittance, for example, a transparent synthetic resin dissolved in a solvent, and the ink is The printed portion provided is a watermark, and has the same visual effect as a white watermark.
  • Japanese Patent No. 3486138 when a paper layer having a white watermark and another paper layer having a fluorescence coloring property are laminated and irradiated with ultraviolet light, relatively strong fluorescence can be visually recognized from the watermark portion, thereby There is disclosed a laminated sheet in which a watermark portion can be recognized as an image of a character, a pattern or the like.
  • the composition of the second paper layer is different from the composition of the first paper layer.
  • the type or content of fibers contained in the second paper layer may be different from the type or content of fibers contained in the first paper layer.
  • the type or content of the filler contained in the second layer may be different from the type or content of the filler contained in the first paper layer. That is, the type of fibers contained in the second paper layer and the fibers contained in the first paper layer may be different, and the fibers contained in the second paper layer and in the first paper layer
  • the types of fibers contained in may be the same, or the contents of both may be different.
  • the type of fiber means the type of fiber material, fiber diameter or fiber length, and if at least one of these is different, the type of fiber will be different.
  • the colorant in the first aspect of the present invention is preferably a dye and / or a pigment.
  • the second paper layer forming step It is preferable that the second paper layer be formed on the first paper layer by disposing a stock in the pattern of the image area.
  • the pigment in the second aspect of the present invention may be a fluorescent pigment.
  • the method for producing a multilayer paper of the present invention preferably further includes a third paper layer forming step of forming a third paper layer on at least a part of the second paper layer.
  • the boundary between the watermark portion (image portion) and the other portion (non-image portion) can be made clearer.
  • a fluorescent coloring agent such as a fluorescent dye or a fluorescent pigment as a coloring agent, an image can be recognized by irradiation with ultraviolet light or the like.
  • the watermark portion can be colored to make the boundary between the watermark portion and the other portion clearer.
  • the watermark portion and the colored image such as a fluorescent image can be well matched.
  • the image can be protected by further comprising a third paper layer covering at least a part of the second paper layer, and the appearance of the image can be adjusted.
  • the image formed by the watermark portion is preferably a positive image pattern. Therefore, in the present invention, it is preferable that the watermark part constitutes an image such as a character or figure to be expressed.
  • a first aspect of the present invention is a multilayer paper comprising a first paper layer and a second paper layer, wherein The multi-layer paper wherein the second paper layer forms an image portion having high opacity as compared to the non-image portion.
  • the non-image portion is preferably formed by the first paper layer.
  • the first paper layer and the second paper layer are separate layers, but preferably in contact. In this case, at least a part, for example, all of the contact portions of the first and second paper layers may be mixed and integrated.
  • the surface area of the second paper layer is preferably smaller than the surface area of the first paper layer. That is, it is preferable that the second paper layer be present not on the entire surface of the first paper layer, but on a part of the surface of the first paper layer.
  • the first and second plies contain stock.
  • the stock mainly consists of fibers, especially cellulose fibers, such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), thermomechanical pulp (TMP), etc.
  • Wood pulp other, non-wood pulp such as hemp, bamboo, rattan, kenaf, three-pot, rattan, cotton etc; modified pulp such as cationized pulp, mercerized pulp; regenerated cellulose fibers such as rayon etc .
  • the species can be used alone or in combination of two or more.
  • At least one of the first and second paper layers may contain components other than cellulose fibers.
  • Other components include, for example, synthetic fibers made of resins such as polyethylene, polypropylene and polyethylene terephthalate; paper strength or fixing agents such as starch, polyacrylamide and polyamine polyamide epichlorohydrin; sizing agents, fillers, retention of drainage water Water-proofing agents, fixing agents, antifoaming agents, slime control agents, etc. may be mentioned, and one of these may be used alone or in combination of two or more.
  • FIG. 1 is a view showing an embodiment of the multilayer paper of the present invention.
  • the multilayer paper of the present invention shown in FIG. 1 comprises a first paper layer 1 and a second paper layer 2, and the second paper layer 2 is disposed in contact with one surface of the first paper layer 1.
  • the second paper layer 2 is arranged on the first paper layer 1 so as to constitute a predetermined image pattern. Specifically, the second paper layer 2 represents the image "A" on the first paper layer 1, and the first paper layer 1 represents the background of the image.
  • the existing portion of the second paper layer 2 is thicker than the peripheral portion (background) formed by the first paper layer 1 by the thickness thereof. Therefore, the second paper layer 2 forms an image portion having high opacity as compared to the peripheral portion.
  • the image formed by the second paper layer 2 appears darker than the peripheral portion. That is, when the front face of the multilayer paper of FIG. 1 is visually observed by transmitted light, an image of “A” having relatively low lightness can be recognized. That is, the second paper layer 2 constitutes a black watermark portion.
  • the image portion formed by the second paper layer 2 and the non-image portion formed by the first paper layer 1 have different appearances when viewed from the front. Therefore, the multilayer paper of the present invention has a clear boundary between the watermark portion and the other portion.
  • the composition of the second paper layer 2 is preferably different from the composition of the first paper layer 1.
  • the second paper layer 2 preferably contains a different type of material from the first paper layer 1.
  • the substance is not particularly limited, and includes paper stock, fillers, coloring agents and the like.
  • the stock contained in the second paper layer 2 preferably contains more fibers having a short fiber length, in particular, cellulose fibers, more than the stock contained in the first paper layer.
  • the material or diameter of the fibers contained in the first paper layer 1 and the second paper layer 2 may be different as long as the second paper layer 2 contains more fibers with a short fiber length, and the same material or diameter It may be a fiber of
  • fiber length can be designed short by advancing the refining conditions of fiber.
  • the dye is not particularly limited, but is preferably hydrophilic and more preferably a water-soluble aqueous dye.
  • the aqueous dye any may be used, and examples thereof include acid dyes, direct dyes, basic dyes and the like. Specific examples of the aqueous dye include C.I. I. (Color Index) Direct Black 9, 17, 19, 22, 32, 38, 51, 56, 62, 69, 71, 77, 80, 91, 94, 97, 105, 108, 112, 113, 114, 117, 118, 121, 122, 125, 132, 146, 154, 166, 168, 173, 199, C.I. I.
  • the fluorescent dye / fluorescent pigment has a property of emitting fluorescence by irradiation of electromagnetic waves such as ultraviolet light and infrared light, and is not particularly limited as long as it can color the stock.
  • the particles are not particularly limited, and can be produced, for example, by crushing or punching of a sheet containing a colorant, or granulation of a resin mixed with a colorant.
  • the fibers and / or particles may be mixed with the stock in the second paper layer forming step described later, but may be used alone without being mixed with the stock. For example, when the fiber is used alone, it is possible to create a line drawing watermark formed of only the fiber.
  • FIG. 2 is a cross-sectional view showing an aspect of the multilayer paper of the present invention provided with a third paper layer.
  • the watermark portion when the watermark portion is thinner than the non-watermark portion, the watermark portion forms, for example, an image portion having lower opacity than the non-image portion formed by the non-watermark portion. Therefore, in the image area, strength physical properties such as tear strength are lower than in the non-image area.
  • the strength of the image area is significantly lower than that of the non-image area, the load is concentrated on the fragile area of the image area during long-term use of the sheet and during printing and various processing, which may cause tears and the like. Therefore, the reduction rate of the tear strength of the image portion (watermark portion) relative to the non-image portion (non-watermark portion) is preferably less than 30%, more preferably less than 20%, and still more preferably less than 10%.
  • the third paper layer may comprise at least one defect. That is, at least one opening or hole may be formed in the third paper layer.
  • the second paper layer can be visually recognized from the outside through the missing portion of the third paper layer. Therefore, the image formed by the second paper layer can be confirmed directly from the outside.
  • the obtained anti-counterfeit paper exhibited a black watermark in which the image pattern appeared black due to the difference in opacity when observed with transmitted light as in Example 1. Furthermore, only the black watermark portion was stained with a coloring dye, and a color watermark that appeared red when viewed in oblique light or transmitted light was formed. The end of the watermark was sharp.
  • the obtained anti-counterfeit paper formed a layer having a thickened portion of the paper layer, and when observed with transmitted light, a black watermark appeared that the pattern portion appeared black due to the difference in opacity.
  • the black watermark according to the present system has a blur at the end of the watermark and the sharpness is reduced.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Paper (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

This multilayer paper comprises a first paper layer and a second paper layer, wherein the second paper layer forms an image portion having a higher opacity than a non-image portion. With this invention it is possible to provide a multilayer paper with which it is easy to adjust the opacity of a watermark portion, and which has clear boundaries between the watermark portion and other portions.

Description

多層紙及びその製造方法Multilayer paper and method for producing the same
本発明は、商品券、入場券、パスポート、有価証券等の偽造防止に有用な多層紙及びその製造方法に関する。 The present invention relates to a multilayer paper useful for preventing forgery of gift certificates, admission tickets, passports, securities and the like, and a method for producing the same.
　商品券等の印刷物の偽造防止技術として、透かしが知られている。透かしは、それが施されている紙を透かして見たときに現れる模様であり、模様部分が透けて見える「白透かし」と、模様部分が周辺部に比して黒ずんで見える「黒透かし」とが知られている。 A watermark is known as a forgery prevention technology of printed matter such as a gift certificate. A watermark is a pattern that appears when the paper on which it is applied is seen through the screen, and "white watermark" where the pattern part is seen through and "black watermark" where the pattern part is dark compared to the peripheral part And are known.
これらの透かし模様は通常、湿式抄紙における湿紙の形成段階（ワイヤーパート）において、パルプ繊維などの構成繊維の坪量を部分的に変化させることによって形成される。例えば、ワイヤーパートにおいて、模様状にワイヤー目を埋めた抄紙網を用いた場合には、湿紙におけるワイヤー目を埋めた模様部分に対応する部分に、周辺部に比して紙料が乗らず厚みの薄い型付けがなされ、その型付けされた部分が、該湿紙を乾燥して得られる紙における白透かしとなり、また、凹型の模様を施した抄紙網を用いた場合には、湿紙における該凹型の模様部分に対応する部分に、周辺部に比して厚みの厚い型付けがなされ、その型付けされた部分が、該湿紙を乾燥して得られる紙における黒透かしとなる。 These watermarks are usually formed by partially changing the basis weight of constituent fibers such as pulp fibers at the wet paper forming stage (wire part) in wet papermaking. For example, in a wire part, when using a papermaking net in which the wire eyes are filled in a pattern, the portion corresponding to the pattern part filled in the wire eyes in the wet paper does not have stock compared to the peripheral part The thin-typed printing is performed, and the typed part becomes a white watermark on the paper obtained by drying the wet paper, and when a concave-patterned paper net is used, the wet paper is used. A portion corresponding to the concave pattern portion is stamped thicker than the peripheral portion, and the stamped portion becomes a black watermark on the paper obtained by drying the wet paper.
また、透かし模様の一種として、疑似透かし（ケミカル透かし）などと呼ばれるものが知られている。疑似透かしは、紙等のシートに浸透して光透過率を高める物質、例えば、透明合成樹脂を溶剤に溶解したインキを用いてシートに印刷を施すことによって形成されるものであり、そのインキが付与されてなる印刷部が透かし模様となり、白透かしと同様の視覚効果を有する。 Moreover, what is called a pseudo | simulation watermark (chemical watermark) etc. is known as 1 type of a watermark pattern. A pseudo-watermark is formed by printing on a sheet using a substance that penetrates a sheet such as paper to increase the light transmittance, for example, a transparent synthetic resin dissolved in a solvent, and the ink is The printed portion provided is a watermark, and has the same visual effect as a white watermark.
　特許第３４８６１３８号には、白透かしを有する紙層と蛍光発色性を有する別の紙層とを積層し、紫外線を照射すると、透かし部分から比較的強い蛍光を視認することができ、これにより、透かし部分が文字、図柄等の画像として認識可能な積層紙が開示されている。 In Japanese Patent No. 3486138, when a paper layer having a white watermark and another paper layer having a fluorescence coloring property are laminated and irradiated with ultraviolet light, relatively strong fluorescence can be visually recognized from the watermark portion, thereby There is disclosed a laminated sheet in which a watermark portion can be recognized as an image of a character, a pattern or the like.
特許第３４８６１３８号公報Patent No. 3486138 gazette
　しかし、通常の白透かしでは、周辺部よりも薄い透かし部分によって画像を表現するために、紙料の付着量の制限には限界があり、例えば紙料の付着量を過剰に制限すると穴があいてしまう、または透かし部分が脆弱となるため、透かし部分の不透明度の調整が困難な場合がある。 However, with ordinary white watermarks, there is a limit to the amount of adhered paper stock, because, for example, an image is represented by a watermark portion thinner than the peripheral portion, for example, excessive restriction of the amount of paper stock adhesion leads to holes It may be difficult to adjust the opacity of the watermark portion because the watermark portion becomes fragile.
　また、特許第３４８６１３８号公報に記載の多層紙では、透かし部分以外も蛍光発光するので、透かし部分の画像を蛍光の強度差によって認識することが困難な場合がある。 Further, in the multilayer paper described in Japanese Patent No. 3486138, since fluorescence is emitted in areas other than the watermark portion, it may be difficult to recognize the image of the watermark portion by the difference in the fluorescence intensity.
　一方、通常の黒透かしでは、周辺部よりも厚い透かし部分によって画像を表現するために、ワイヤーパートにおける網に凹部を形成することによって当該網への紙料の付着量を増大させて当該透かし部分を形成する。したがって、紙料の付着量の増大には比較的自由度があり、不透明度の調整が容易である。 On the other hand, in the case of a normal black watermark, in order to represent an image by a watermark portion thicker than the peripheral portion, the amount of adhesion of the stock on the net is increased by forming a recess in the net in the wire part Form Therefore, there is a relative freedom in the increase in the amount of deposited paper stock, and the adjustment of the opacity is easy.
しかし、通常の黒透かしでは、透かし部分とその他の部分は同一の紙料から形成されることになり、透かし部分とその他の部分の境界があまり明瞭でない場合がある。 However, in a normal black watermark, the watermark portion and the other portion are formed from the same stock, and the boundary between the watermark portion and the other portion may not be so clear.
　本発明は、従来の白透かし及び黒透かしが抱える上記の問題点を解決することをその課題とする。具体的には、本発明は、透かし部分の不透明度の調整が容易であり、且つ、透かし部分とその他の部分との境界が明瞭である多層紙を提供することをその課題とする。 An object of the present invention is to solve the above-mentioned problems with conventional white and black watermarks. Specifically, the object of the present invention is to provide a multilayer paper in which the adjustment of the opacity of the watermark portion is easy and the boundary between the watermark portion and the other portion is clear.
　そこで、鋭意検討の結果、本発明者らは、従来の黒透かしを改良することによって、透かし部分の不透明度の調整が容易であり、且つ、透かし部分とその他の部分との境界が明瞭である多層紙を提供可能であることを見出し、本発明を完成した。 Therefore, as a result of intensive studies, the present inventors can easily adjust the opacity of the watermark portion by improving the conventional black watermark, and the boundary between the watermark portion and the other portion is clear. The inventors have found that it is possible to provide a multi-layer paper and have completed the present invention.
本発明の第１の態様は、第１紙層及び第２紙層を備える多層紙であって、
前記第２紙層が非画像部に比して高い不透明度を有する画像部を形成する、多層紙である。 A first aspect of the present invention is a multilayer paper comprising a first paper layer and a second paper layer, wherein
The multi-layer paper wherein the second paper layer forms an image portion having high opacity as compared to the non-image portion.
　前記第２紙層の組成が前記第１紙層の組成とは異なることが好ましい。例えば、前記第２紙層に含まれる繊維の種類又は含量が前記第１紙層に含まれる繊維の種類又は含量とは異なることができる。また、前記第２層に含まれる填料の種類又は含量が前記第１紙層に含まれる填料の種類又は含量とは異なることができる。すなわち、前記第２紙層中に含まれる繊維と前記第１紙層中に含まれる繊維の種類は異なってもよく、また、前記第２紙層中に含まれる繊維と前記第１紙層中に含まれる繊維の種類が同一であっても、両者の含量が異なっていてもよい。なお、繊維の種類とは繊維の材質、繊維径又は繊維長のタイプを意味しており、これらのうちの少なくとも１つが異なれば繊維の種類が異なることとなる。 Preferably, the composition of the second paper layer is different from the composition of the first paper layer. For example, the type or content of fibers contained in the second paper layer may be different from the type or content of fibers contained in the first paper layer. Also, the type or content of the filler contained in the second layer may be different from the type or content of the filler contained in the first paper layer. That is, the type of fibers contained in the second paper layer and the fibers contained in the first paper layer may be different, and the fibers contained in the second paper layer and in the first paper layer The types of fibers contained in may be the same, or the contents of both may be different. The type of fiber means the type of fiber material, fiber diameter or fiber length, and if at least one of these is different, the type of fiber will be different.
　本発明の多層紙の前記第２紙層が着色剤を含むことが好ましい。 It is preferred that the second paper layer of the multilayer paper of the present invention comprises a colorant.
　本発明の第１の態様における前記着色剤は染料及び／又は顔料であることが好ましい。 The colorant in the first aspect of the present invention is preferably a dye and / or a pigment.
　本発明の第１の態様における前記染料は蛍光染料であってもよい。 The dye in the first aspect of the present invention may be a fluorescent dye.
　本発明の第１の態様における前記顔料は蛍光顔料であってもよい。 The pigment in the first aspect of the present invention may be a fluorescent pigment.
　本発明の第１の態様における前記第１紙層が前記着色剤を含まないことが好ましい。 It is preferable that the first paper layer in the first aspect of the present invention does not contain the colorant.
　本発明の第１の態様における前記第２紙層は着色繊維又は蛍光繊維を含むことが好ましい。 The second paper layer in the first aspect of the present invention preferably contains colored fibers or fluorescent fibers.
　本発明の第１の態様における前記第１紙層は前記着色繊維又は前記蛍光繊維を含まないことが好ましい。 It is preferable that the first paper layer in the first aspect of the present invention does not contain the colored fiber or the fluorescent fiber.
　本発明の多層紙は前記第２紙層の少なくとも一部を被覆する第３紙層を更に備えることが好ましい。 Preferably, the multilayer paper of the present invention further comprises a third paper layer covering at least a part of the second paper layer.
　前記第３紙層は少なくとも１つの欠損部を含むことができる。 The third paper layer can include at least one defect.
　前記第２紙層及び前記第３紙層の間に少なくとも１つのスレッドを含んでもよい。 At least one thread may be included between the second paper layer and the third paper layer.
　本発明の多層紙では、前記第２紙層に形成された前記画像部がデータ情報を表すことができる。 In the multilayer paper of the present invention, the image portion formed on the second paper layer can represent data information.
　本発明の第２の態様は、
　前記第１紙層を形成する第１紙層形成工程、及び
前記第１紙層上に第２紙層を形成する第２紙層形成工程
を備えており、
前記第２紙層が非画像部に比して高い不透明度を有する画像部を形成する、
多層紙の製造方法である。 The second aspect of the present invention is
The method includes a first paper layer forming step of forming the first paper layer, and a second paper layer forming step of forming a second paper layer on the first paper layer,
The second paper layer forms an image portion having high opacity as compared to the non-image portion.
It is a manufacturing method of multilayer paper.
　前記第２紙層形成工程が、
前記第１紙層上に、前記画像部のパターンに紙料を配置することで前記第２紙層を形成することが好ましい。 The second paper layer forming step
It is preferable that the second paper layer be formed on the first paper layer by disposing a stock in the pattern of the image area.
　本発明の多層紙の製造方法において前記第２紙層が着色剤を含むことが好ましい。 In the method for producing a multilayer paper of the present invention, the second paper layer preferably contains a colorant.
　本発明の第２の態様における前記着色剤は染料及び／又は顔料であることが好ましい。 The colorant in the second aspect of the present invention is preferably a dye and / or a pigment.
　本発明の第２の態様における前記染料は蛍光染料であってもよい。 The dye in the second aspect of the present invention may be a fluorescent dye.
　本発明の第２の態様における前記顔料は蛍光顔料であってもよい。 The pigment in the second aspect of the present invention may be a fluorescent pigment.
　本発明の第２の態様における前記第１紙層が前記着色剤を含まないことが好ましい。 Preferably, the first paper layer in the second aspect of the present invention does not contain the colorant.
　本発明の第２の態様における前記第２紙層は着色繊維又は蛍光繊維を含むことが好ましい。 The second paper layer in the second aspect of the present invention preferably contains colored fibers or fluorescent fibers.
　本発明の第２の態様における前記第１紙層は前記着色繊維又は前記蛍光繊維を含まないことが好ましい。 It is preferable that the first paper layer in the second aspect of the present invention does not contain the colored fiber or the fluorescent fiber.
　本発明の多層紙の製造方法は、前記第２紙層の少なくとも一部の上に第３紙層を形成する第３紙層形成工程を更に含むことが好ましい。 The method for producing a multilayer paper of the present invention preferably further includes a third paper layer forming step of forming a third paper layer on at least a part of the second paper layer.
　前記第３紙層は少なくとも１つの欠損部を含むことができる。 The third paper layer can include at least one defect.
前記第２紙層及び前記第３紙層の間に少なくとも１つのスレッドを配設する工程を含んでもよい。 The method may include the step of disposing at least one thread between the second paper layer and the third paper layer.
　本発明の多層紙の製造方法では、前記第２紙層に形成された前記画像部がデータ情報を表すことができる。 In the method for manufacturing a multilayer paper of the present invention, the image portion formed on the second paper layer can represent data information.
　本発明の多層紙及びその製造方法は、透かし部分の不透明度の調整が容易であり、且つ、透かし部分とその他の部分との境界が明瞭である。 The multilayer paper of the present invention and the method of manufacturing the same facilitate adjustment of the opacity of the watermark portion, and the boundary between the watermark portion and the other portion is clear.
　第２紙層が染料、顔料等の着色剤を含む場合は、透かし部分（画像部）とその他の部分（非画像部）との境界をより明瞭とすることができる。特に、着色剤を蛍光染料、蛍光顔料等の蛍光性着色剤を使用することにより、紫外線等の照射によって画像を認識することができる。 When the second paper layer contains a coloring agent such as a dye or pigment, the boundary between the watermark portion (image portion) and the other portion (non-image portion) can be made clearer. In particular, by using a fluorescent coloring agent such as a fluorescent dye or a fluorescent pigment as a coloring agent, an image can be recognized by irradiation with ultraviolet light or the like.
　第１紙層が上記着色剤を含まない場合は、透かし部分のみを着色して、透かし部分とその他の部分との境界を更により明瞭とすることができる。この場合、透かし部分と蛍光像等の着色像を良好に一致させることができる。 In the case where the first paper layer does not contain the above-mentioned colorant, only the watermark portion can be colored to make the boundary between the watermark portion and the other portion clearer. In this case, the watermark portion and the colored image such as a fluorescent image can be well matched.
前記第２紙層の少なくとも一部を被覆する第３紙層を更に備えることにより画像を保護することができ、また、画像の外観を調整することができる。 The image can be protected by further comprising a third paper layer covering at least a part of the second paper layer, and the appearance of the image can be adjusted.
本発明の多層紙の一態様を示す図である。It is a figure which shows one aspect | mode of the multilayer paper of this invention. 第３紙層を備える本発明の多層紙の一態様を示す断面図である。It is sectional drawing which shows one aspect | mode of the multilayer paper of this invention provided with a 3rd paper layer. 本発明の多層紙の製造方法の一態様を示す図である。It is a figure which shows the one aspect | mode of the manufacturing method of the multilayer paper of this invention. 本発明の多層紙の製造方法の一態様で使用される型を示す図である。FIG. 1 is a diagram showing a mold used in one aspect of the method for producing a multilayer paper of the present invention. 第３紙層を備える本発明の多層紙の製造方法の態様を示す図である。FIG. 6 shows an embodiment of the method for producing a multilayer paper of the invention comprising a third paper layer.
　本発明は従来の黒透かしをベースとしてこれを改良したものであり、本発明の多層紙では、従来の黒透かしのように、透かし部分が周辺部（非画像部）に比して高い不透明度を有する画像を形成するが、本発明では少なくとも第１紙層及び第２紙層から多層紙を構成しており、第２紙層が当該透かし部分を、第２紙層が周辺部を形成する。 The present invention is an improvement based on the conventional black watermark, and in the multilayer paper of the present invention, the watermark portion has high opacity compared to the peripheral portion (non-image portion) like the conventional black watermark. In the present invention, a multilayer paper is formed of at least a first paper layer and a second paper layer, and the second paper layer forms the watermark portion and the second paper layer forms the peripheral portion. .
　本発明では、透かし部分が周辺部（非画像部）に比して高い不透明度を有する画像を形成する黒透かしを基本としつつも、透かし部分（画像部）を構成する層とその他の部分（非画像部）を構成する層を分けることにより、透かし部分の不透明度の調整を容易とし、且つ、透かし部分とその他の部分の境界を明瞭とすることができる。従来の黒透かしでは、透かし部分とその他の部分は同一の層から形成されているので、透かし部分が構成する画像の境界の鮮明度が本発明のものに比べて劣る。 In the present invention, the layer and other parts that constitute the watermark part (image part) are based on the black watermark that forms an image in which the watermark part has high opacity compared to the peripheral part (non-image part) By separating the layers constituting the non-image part, it is possible to facilitate the adjustment of the opacity of the watermark part and to make the boundary between the watermark part and the other part clear. In the conventional black watermark, since the watermark portion and the other portions are formed from the same layer, the definition of the boundary of the image formed by the watermark portion is inferior to that of the present invention.
　本発明において透かし部分が構成する画像はポジ画像パターンであることが好ましい。したがって、本発明では透かし部分が表現対象の文字、図等の画像を構成することが好ましい。 In the present invention, the image formed by the watermark portion is preferably a positive image pattern. Therefore, in the present invention, it is preferable that the watermark part constitutes an image such as a character or figure to be expressed.
　以下、本発明の第１の態様及び第２の態様を説明する。 Hereinafter, the first and second aspects of the present invention will be described.
本発明の第１の態様は、第１紙層及び第２紙層を備える多層紙であって、
前記第２紙層が非画像部に比して高い不透明度を有する画像部を形成する、多層紙である。前記非画像部は前記第１紙層が形成することが好ましい。 A first aspect of the present invention is a multilayer paper comprising a first paper layer and a second paper layer, wherein
The multi-layer paper wherein the second paper layer forms an image portion having high opacity as compared to the non-image portion. The non-image portion is preferably formed by the first paper layer.
第１紙層と第２紙層は、独立した層であるが、接触していることが好ましい。この場合、第１紙層と第２紙層の接触部分の少なくとも一部、例えば全部、が混和して一体化していてもよい。 The first paper layer and the second paper layer are separate layers, but preferably in contact. In this case, at least a part, for example, all of the contact portions of the first and second paper layers may be mixed and integrated.
第２紙層の表面積は第１紙層の表面積より小さいことが好ましい。すなわち、第２紙層は第１紙層の表面の全面に亘って存在するのではなく、第１紙層の表面の一部の上に存在することが好ましい。 The surface area of the second paper layer is preferably smaller than the surface area of the first paper layer. That is, it is preferable that the second paper layer be present not on the entire surface of the first paper layer, but on a part of the surface of the first paper layer.
第１紙層及び第２紙層は紙料を含む。通常、紙料は主に繊維、特にセルロース繊維からなり、例えば、針葉樹晒クラフトパルプ（ＮＢＫＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）、針葉樹晒サルファイトパルプ（ＮＢＳＰ）、サーモメカニカルパルプ（ＴＭＰ）等の木材パルプ；他、麻、竹、藁、ケナフ、三椏、楮、木綿等の非木材パルプ；カチオン化パルプ、マーセル化パルプ等の変性パルプ；レーヨン等の再生セルロース繊維等が挙げられ、これらの１種を単独で又は２種以上を組み合わせて用いることができる。 The first and second plies contain stock. Usually, the stock mainly consists of fibers, especially cellulose fibers, such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), thermomechanical pulp (TMP), etc. Wood pulp; other, non-wood pulp such as hemp, bamboo, rattan, kenaf, three-pot, rattan, cotton etc; modified pulp such as cationized pulp, mercerized pulp; regenerated cellulose fibers such as rayon etc .; The species can be used alone or in combination of two or more.
第１紙層及び第２紙層の少なくとも１つはセルロース繊維以外の他の成分を含んでいてもよい。他の成分としては、例えば、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート等の樹脂からなる合成繊維；澱粉、ポリアクリルアミド、ポリアミンポリアミドエピクロルヒドリン等の紙力増強剤又は定着剤；サイズ剤、填料、濾水歩留り向上剤、耐水化剤、定着剤、消泡剤、スライムコントロール剤等が挙げられ、これらの１種を単独で又は２種以上を組み合わせて用いることができる。 At least one of the first and second paper layers may contain components other than cellulose fibers. Other components include, for example, synthetic fibers made of resins such as polyethylene, polypropylene and polyethylene terephthalate; paper strength or fixing agents such as starch, polyacrylamide and polyamine polyamide epichlorohydrin; sizing agents, fillers, retention of drainage water Water-proofing agents, fixing agents, antifoaming agents, slime control agents, etc. may be mentioned, and one of these may be used alone or in combination of two or more.
　図１は本発明の多層紙の一態様を示す図である。 FIG. 1 is a view showing an embodiment of the multilayer paper of the present invention.
　図１（Ａ）及び図１（Ｂ）は、それぞれ、本発明の多層紙の一態様の正面図及び断面図である。 1 (A) and 1 (B) are respectively a front view and a cross-sectional view of one aspect of the multilayer paper of the present invention.
　図１の本発明の多層紙は第１紙層１及び第２紙層２を備えており、第２紙層２は第１紙層１の一方の表面に接触して配置されている。 The multilayer paper of the present invention shown in FIG. 1 comprises a first paper layer 1 and a second paper layer 2, and the second paper layer 2 is disposed in contact with one surface of the first paper layer 1.
図１に示す態様では、第１紙層１の上に、第２紙層２が所定の画像パターンを構成するように配置されている。具体的には、第２紙層２は、第１紙層１上で、画像「Ａ」を表しており、第１紙層１が当該画像の背景を表している。 In the embodiment shown in FIG. 1, the second paper layer 2 is arranged on the first paper layer 1 so as to constitute a predetermined image pattern. Specifically, the second paper layer 2 represents the image "A" on the first paper layer 1, and the first paper layer 1 represents the background of the image.
　図１に示す多層紙では、第２紙層２の存在部分がその厚みの分だけ第１紙層１が構成する周辺部（背景）よりも厚くなっている。したがって、第２紙層２は周辺部に比して高い不透明度を有する画像部を形成する。 In the multilayer paper shown in FIG. 1, the existing portion of the second paper layer 2 is thicker than the peripheral portion (background) formed by the first paper layer 1 by the thickness thereof. Therefore, the second paper layer 2 forms an image portion having high opacity as compared to the peripheral portion.
　斯くして、図１の多層紙の正面を透過光で目視観察すると、第２紙層２が構成する画像は周辺部に比して黒ずんで見える。すなわち、図１の多層紙の正面を透過光で目視観察すると、比較的明度の低い「Ａ」の画像を認識することができる。すなわち、第２紙層２は黒透かし部を構成する。 Thus, when the front face of the multilayer paper of FIG. 1 is visually observed with transmitted light, the image formed by the second paper layer 2 appears darker than the peripheral portion. That is, when the front face of the multilayer paper of FIG. 1 is visually observed by transmitted light, an image of “A” having relatively low lightness can be recognized. That is, the second paper layer 2 constitutes a black watermark portion.
第１紙層１と第２紙層２は図１（Ｂ）に示すように別個の層として独立していることが好ましいが、接触部分の少なくとも一部或いは全部が相互に混和して一体化してもよい。但し、第１紙層１と第２紙層２の接触部分が一体化しても、第１紙層１と第２紙層２は完全には同一とはならない。したがって、第２紙層２が構成する画像部と第１紙層１が構成する非画像部（周辺部又は背景）とは光透過性以外の点でも外観が異なる。 Although it is preferable that the first paper layer 1 and the second paper layer 2 are independent as separate layers as shown in FIG. 1 (B), at least a part or all of the contact portions are mixed and integrated with each other May be However, even if the contact portions of the first paper layer 1 and the second paper layer 2 are integrated, the first paper layer 1 and the second paper layer 2 are not completely identical. Therefore, the appearance of the image portion formed by the second paper layer 2 and the non-image portion (peripheral portion or background) formed by the first paper layer 1 also differ in appearance other than the light transmittance.
　このように、本発明の多層紙では、第２紙層２が構成する画像部と第１紙層１が構成する非画像部とは正面からみて異なる外観を有する。したがって、本発明の多層紙は、透かし部分とその他の部分との境界が明瞭である。 As described above, in the multilayer paper of the present invention, the image portion formed by the second paper layer 2 and the non-image portion formed by the first paper layer 1 have different appearances when viewed from the front. Therefore, the multilayer paper of the present invention has a clear boundary between the watermark portion and the other portion.
第２紙層２の組成は第１紙層１の組成と異なることが好ましい。本発明の一態様では、第２紙層２は、第１紙層１とは異なる種類の物質を含むことが好ましい。当該物質は特には限定されるものではないが、紙料、填料、着色剤などが挙げられる。 The composition of the second paper layer 2 is preferably different from the composition of the first paper layer 1. In one aspect of the present invention, the second paper layer 2 preferably contains a different type of material from the first paper layer 1. The substance is not particularly limited, and includes paper stock, fillers, coloring agents and the like.
本発明の一態様では、第２紙層２に含まれる紙料は、第１紙層に含まれる紙料に比べて、繊維長の短い繊維、特にセルロース繊維、をより多く含むことが好ましい。これにより、第２紙層による透かしのシャープさを向上できる。なお、第２紙層２が繊維長の短い繊維をより多く含む限り、第１紙層１と第２紙層２に含まれる繊維の材質又は径は異なってもよく、また、同じ材質又は径の繊維であってもよい。なお、繊維の叩解条件を進めることで繊維長を短く設計することができる。 In one aspect of the present invention, the stock contained in the second paper layer 2 preferably contains more fibers having a short fiber length, in particular, cellulose fibers, more than the stock contained in the first paper layer. Thereby, the sharpness of the watermark by the second paper layer can be improved. The material or diameter of the fibers contained in the first paper layer 1 and the second paper layer 2 may be different as long as the second paper layer 2 contains more fibers with a short fiber length, and the same material or diameter It may be a fiber of In addition, fiber length can be designed short by advancing the refining conditions of fiber.
　本発明の一態様では、第２紙層２は、第１紙層１に比べ、より不透明度が高いことが好ましい。これにより、透かしのコントラストをより高めることが可能である。第２紙層２の不透明度を高くする方法は特に限定されないが、例えば、第２紙層２にのみに填料を配合したり、第１紙層１よりも填料を多く配合することが挙げられる。また、第１紙層１と第２紙層２とで異なる種類の填料を添加したり、配合割合を調整してもよい。 In one aspect of the present invention, the second paper layer 2 is preferably higher in opacity than the first paper layer 1. This makes it possible to further enhance the watermark contrast. The method for increasing the opacity of the second paper layer 2 is not particularly limited. For example, it is possible to mix the filler only in the second paper layer 2 or mix more the filler than the first paper layer 1 . Further, different types of fillers may be added to the first paper layer 1 and the second paper layer 2, or the blending ratio may be adjusted.
　第２紙層２は着色剤を含むことが好ましい。着色剤は特に限定されるものではないが、染料及び／又は顔料であることが好ましい。また、染料は蛍光染料であってもよく、顔料は蛍光顔料であってもよい。 The second paper layer 2 preferably contains a colorant. The colorant is not particularly limited, but is preferably a dye and / or a pigment. The dye may be a fluorescent dye, and the pigment may be a fluorescent pigment.
　第２紙層２が染料、顔料等の着色剤を含むことにより、透かし部分と周辺部（背景）との境界をより明瞭とすることができる。特に、着色剤を蛍光染料、蛍光顔料等の蛍光性着色剤を使用することにより、例えば、赤外線、紫外線等を照射することにより透かし部分が形成する画像を認識することができる。また、赤外線、紫外線等を反射吸収する材料を使用することにより、赤外線、紫外線等の電磁波を用いた機械読み取りにも対応することが出来る。 When the second paper layer 2 contains a coloring agent such as a dye or pigment, the boundary between the watermark portion and the peripheral portion (background) can be made clearer. In particular, by using a fluorescent coloring agent such as a fluorescent dye or a fluorescent pigment as the coloring agent, it is possible to recognize an image formed by the watermark portion by irradiating, for example, infrared rays, ultraviolet rays and the like. In addition, by using a material that reflects and absorbs infrared rays, ultraviolet rays, etc., it is possible to cope with machine reading using electromagnetic waves such as infrared rays, ultraviolet rays, etc.
　染料は特に限定されるものではないが、親水性のものが好ましく、水に溶解可能な水性染料がより好ましい。水性染料としては、任意のものを使用することができ、例えば、酸性染料、直接染料、塩基性染料等が挙げられる。水性染料の具体例としては、Ｃ．Ｉ．（カラーインデックス）ダイレクトブラック９、１７、１９、２２、３２、３８、５１、５６、６２、６９、７１、７７、８０、９１、９４、９７、１０５、１０８、１１２、１１３、１１４、１１７、１１８、１２１、１２２、１２５、１３２、１４６、１５４、１６６、１６８、１７３、１９９、Ｃ．Ｉ．ダイレクトバイオレット７、９、４７、４８、５１、６６、９０、９３、９４、９５、９８、１００、１０１、Ｃ．Ｉ．ダイレクトレッド２３、８３、２２７、Ｃ．Ｉ．ダイレクトイエロー８、９、１１、１２、２７、２８、２９、３３、３５、３９、４１、４４、５０、５３、５８、５９、６８、８６、８７、９３、９５、９６、９８、１００、１０６、１０８、１０９、１１０、１３０、１３２、１４４、１６１、１６３、Ｃ．Ｉ．ダイレクトブルー１、１０、１５、２２、２５、５５、６７、６８、７１、７６、７７、７８、８０、８４、８６、８７、９０、９８、１０６、１０８、１９９、２０１、２０２、２３６、２３７、２４４、２５１、２８０、Ｃ．Ｉ．アシッドブラック７、２４、２９、３１、４８、５２、９４、Ｃ．Ｉ．アシッドバイオレット５、３４、４３、４７、４８、９０、１０３、Ｃ．Ｉ．アシッドレッド８７、１８６、２５４、２８９、Ｃ．Ｉ．アシッドイエロー１７、１９、２３、２５、３９、４０、４２、４４、４９、５０、６１、１１０、１７４、２１８、Ｃ．Ｉ．アシッドブルー９、２５、４０、４１、６２、７２、７６、７８、８０、８２、１０６、１１２、１２０、２０５、２３０、２３４、２７１、２８０等が挙げられる。 The dye is not particularly limited, but is preferably hydrophilic and more preferably a water-soluble aqueous dye. As the aqueous dye, any may be used, and examples thereof include acid dyes, direct dyes, basic dyes and the like. Specific examples of the aqueous dye include C.I. I. (Color Index) Direct Black 9, 17, 19, 22, 32, 38, 51, 56, 62, 69, 71, 77, 80, 91, 94, 97, 105, 108, 112, 113, 114, 117, 118, 121, 122, 125, 132, 146, 154, 166, 168, 173, 199, C.I. I. Direct violet 7, 9, 47, 48, 51, 66, 90, 93, 94, 95, 98, 100, 101, C.I. I. Direct Red 23, 83, 227, C.I. I. Direct Yellow 8, 9, 11, 12, 27, 28, 29, 33, 35, 39, 41, 44, 50, 53, 58, 59, 68, 86, 87, 93, 95, 96, 98, 100, 106, 108, 109, 110, 130, 132, 144, 161, 163, C.I. I. Direct Blue 1, 10, 15, 22, 25, 55, 67, 68, 71, 76, 77, 78, 80, 84, 86, 87, 90, 98, 106, 108, 199, 201, 202, 236, 237, 244, 251, 280, C.I. I. Acid Black 7, 24, 29, 31, 48, 52, 94, C.I. I. Acid Violet 5, 34, 43, 47, 48, 90, 103, C.I. I. Acid Red 87, 186, 254, 289, C.I. I. Acid Yellow 17, 19, 23, 25, 39, 40, 42, 44, 49, 50, 61, 110, 174, 218, C.I. I. Acid Blue 9, 25, 40, 41, 62, 72, 76, 78, 80, 82, 106, 112, 120, 205, 230, 234, 271, 280 and the like.
顔料も特に限定されるものではなく、任意のものを使用することができる。顔料としては無機系顔料、有機系顔料及びこれらの混合物を使用することができる。顔料は親水性のものが好ましく、水分散性のものがより好ましい。 The pigment is also not particularly limited, and any may be used. As pigments, inorganic pigments, organic pigments and mixtures thereof can be used. The pigment is preferably hydrophilic and more preferably water-dispersible.
無機系顔料としては、例えば、二酸化チタン、亜鉛華（酸化亜鉛）、酸化鉄、酸化クロム、鉄黒、コバルトブルー、アルミナ白、酸化鉄黄、ビリジアン、硫化亜鉛、リトポン、朱、カドミウムレッド、黄鉛、モリブデートオレンジ、ジンククロメート、ストロンチウクロメート、ホワイトカーボン、クレィ、タルク、群青、沈降性硫酸バリウム、バライト粉、炭酸カルシウム、鉛白、フェロシアン化物（紺青）、燐酸塩（マンガンバイオレット）、カーボンブラック等が挙げられる。 As inorganic pigments, for example, titanium dioxide, zinc flower (zinc oxide), iron oxide, chromium oxide, iron black, cobalt blue, alumina white, iron yellow, viridian, zinc sulfide, lithopone, amber, cadmium red, yellow Lead, molybdate orange, zinc chromate, strontium chromate, white carbon, clay, talc, ultramarine blue, precipitated barium sulfate, barite powder, calcium carbonate, lead white, ferrocyanide (bituminous), phosphate (manganese violet), Carbon black etc. are mentioned.
有機系顔料としては、例えば、ローダミンレーキ、メチルバイオレットレーキ、キノリンエローレーキ、マラカイトグリーンレーキ、アリザリンレーキ、カーミン６Ｂ、レーキレッドＣ、ジスアゾエロー、レーキレッド４Ｒ、クロモフタルエロー３Ｇ、クロモフタルスカーレットＲＮ、ニッケルアゾエロー、パーマネントオレンジＨＬ、フタロシアニンブルー、フタロシアニングリーン、フラバンスロンエロー、チオインジゴボルドー、ペリンレッド、ジオキサドンバイオレット、キナクリドンレッド、ナフトールエローＳ、ピグロントグリーンＢ、ルモゲンエロー、シグナルレッド、アルカリブルー、アニリンブラック等が挙げられる。 Organic pigments include, for example, rhodamine lake, methyl violet lake, quinoline yellow lake, malachite green lake, alizarin lake, carmine 6B, lake red C, disazo yellow, lake red 4R, chromophthal yellow 3G, chromophor scarlet RN, nickel Azoellow, permanent orange HL, phthalocyanine blue, phthalocyanine green, flavanthrone yellow, thioindigo bordeaux, perin red, dioxadone violet, quinacridone red, naphthol yellow S, pigront green B, lumogen yellow, signal red, alkali blue, aniline Black etc. are mentioned.
　蛍光染料・蛍光顔料は、紫外線、赤外線等の電磁波の照射により蛍光を発する性質があり、紙料を着色可能なものであれば特に限定されるものではない。 The fluorescent dye / fluorescent pigment has a property of emitting fluorescence by irradiation of electromagnetic waves such as ultraviolet light and infrared light, and is not particularly limited as long as it can color the stock.
紫外線により蛍光を発する蛍光染料としては、クマリン系、オキサゾール系、ピラゾリン系等の紫外蛍光染料が一例として挙げられる。これらの紫外蛍光染料は、通常の光源のもとでは無色であるが、紫外線の照射により青白色に発光する。この種の紫外蛍光染料は、染料メーカー各社によって販売されているが、（商品名「Ｍｉｋａｗｈｉｔｅ ＡＴＮ ｃｏｎｃ．」、日本化薬（株）製造：通常の光源のもとで無色、紫外線の照射で赤味掛かった白色に発色）、（商品名「Ｌｅｕｃｏｐｈｅｒ ＥＦ ２Ｎ」、クラリアント（株）製造：通常の光源のもとで無色、紫外線の照射でわずかに青味の白色に発色）等が挙げられる。 Examples of fluorescent dyes that emit fluorescence by ultraviolet light include ultraviolet fluorescent dyes such as coumarins, oxazoles and pyrazolines. These ultraviolet fluorescent dyes are colorless under normal light sources, but emit bluish white light upon irradiation with ultraviolet light. UV fluorescent dyes of this type are sold by dye manufacturers (trade name “Mikawhite ATN conc.”, Manufactured by Nippon Kayaku Co., Ltd .: colorless under normal light source, red under UV irradiation) (Color development in tasted white), (trade name “Leucopher EF 2N”, Clariant Co., Ltd. production: colorless under ordinary light source, slightly bluish white in ultraviolet irradiation) and the like.
本発明では、通常の光源のもとでは有彩色で、紫外線の照射により各種色相に発光するアミノケトン系等の染料も使用できる。この種の紫外蛍光染料も染料メーカー各社によって販売されているが、（商品名「Ｙｅｌｌｏｗｆｌｕｏｒ Ｇ」、住友化学工業（株）製造：通常の光源のもとで黄色、紫外線の照射で黄色に発色）、（商品名「Ｋａｙａｓｅｔ Ｆｌａｖｉｎｅ ＦＮ」、日本化薬（株）製造：通常の光源のもとで黄色、紫外線の照射で黄色に発色）、（商品名「Ｋａｙａｓｅｔ Ｆｌａｖｉｎｅ ＦＧ」、日本化薬（株）製造：通常の光源のもとで黄色、紫外線の照射で黄色に発色）、（商品名「Ｋａｙａｓｅｔ Ｙｅｌｌｏｗ ＳＦ－Ｇ」、日本化薬（株）製造：通常の光源のもとで黄色、紫外線の照射で黄色に発色）、（商品名「Ｋａｙａｓｅｔ Ｏｒａｎｇｅ ＳＦ－Ｒ」、日本化薬（株）製造：通常の光源のもとでオレンジ色、紫外線の照射でオレンジ色に発色）、（商品名「Ｋａｙａｓｅｔ Ｒｅｄ ＳＦ－Ｂ」、日本化薬（株）製造：通常の光源のもとで赤色、紫外線の照射で赤色に発色）、（商品名「Ｋａｙａｓｅｔ Ｒｅｄ ＳＦ－４Ｇ」、日本化薬（株）製造：通常の光源のもとで赤色、紫外線の照射で赤色に発色）、等々が挙げられる。 In the present invention, it is also possible to use dyes such as amino ketone dyes which are chromatic under a normal light source and emit light of various hues upon irradiation with ultraviolet light. UV fluorescent dyes of this type are also sold by dye manufacturers (brand name "Yellowfluor G", manufactured by Sumitomo Chemical Co., Ltd .: yellow under normal light source, yellow upon irradiation with ultraviolet light) , (Brand name "Kayaset Flavine FN", manufactured by Nippon Kayaku Co., Ltd .: yellow under normal light source, colored yellow upon irradiation with ultraviolet light), (brand name "Kayaset Flavine FG", Nippon Kayaku (stock ) Production: yellow under normal light source, yellow upon irradiation with ultraviolet light) (trade name "Kayaset Yellow SF-G", manufactured by Nippon Kayaku Co., Ltd .: yellow under normal light source, ultraviolet light (Color: "Kayaset Orange SF-R", manufactured by Nippon Kayaku Co., Ltd.): Orange under normal light source, Orange under ultraviolet light (Color name: "Kayaset Red SF-B", manufactured by Nippon Kayaku Co., Ltd .: red under normal light source, color red when irradiated with ultraviolet light), (trade name: "Kayaset Red SF-4G" , Nippon Kayaku Co., Ltd. production: red under normal light source, red color upon irradiation with ultraviolet light, and the like.
紫外線により蛍光を発する蛍光顔料としては、例えば、無機の紫外蛍光顔料を使用することができる。具体的には、銅、銀、マンガン等で活性化した硫化亜鉛；マンガン等で活性化したケイ酸亜鉛；銀、銅等で活性化した硫化亜鉛；カドミウム、ビスマス等で活性化した硫化カルシウム；サマリウム、セリウム等で活性化した硫化ストロンチウム；鉛等で活性化したタングステン酸カルシウム；ユーロピウム等で活性化したＳｒ５（ＰＯ４）３Ｃｌ；マンガン等で活性化したＺｎ２ＧｅＯ２；ユーロピウム等で活性化したＹ２Ｏ２Ｓ；ユーロピウム等で活性化したＹ２Ｏ３等を挙げることができる。また、必要に応じて、これらにアントラキノン系やアセトフェノン系等の増感剤を併用することもできる。また、蛍光顔料を造粒形成した蛍光粒子を使用することで、強い蛍光発色が可能となるので、そのような蛍光粒子の使用が好ましい。 As a fluorescent pigment which emits fluorescence by ultraviolet light, for example, an inorganic ultraviolet fluorescent pigment can be used. Specifically, zinc sulfide activated with copper, silver, manganese or the like; zinc silicate activated with manganese or the like; zinc sulfide activated with silver, copper or the like; calcium sulfide activated with cadmium, bismuth or the like; Strontium sulfide activated with samarium, cerium etc .; Calcium tungstate activated with lead etc .; Sr 5 (PO 4 ) 3 Cl activated with europium etc .: Zn 2 GeO 2 activated with manganese etc .: europium etc Examples thereof include activated Y 2 O 2 S; europium etc. activated Y 2 O 3 and the like. If necessary, sensitizers such as anthraquinone type and acetophenone type can be used in combination therewith. Moreover, since strong fluorescence coloration becomes possible by using the fluorescent particle which formed the fluorescent pigment by granulation, use of such a fluorescent particle is preferable.
上記の紫外線、赤外線等を反射吸収する材料は、例えば、白色の材料としては酸化チタン、透明の材料としてはアンチモン酸化スズ、スズ酸化インジウム、６ホウ化ランタン、セシウム酸化タングステンなどを使用することができる。これにより、黒透かし本来の視認性を損なうことなく、紫外線、赤外線等の電磁波を用いた機械読み取り能を付与することが出来る。 The above-mentioned materials that reflect and absorb ultraviolet light, infrared light, etc. may use, for example, titanium oxide as a white material, antimony tin oxide as a transparent material, antimony tin oxide, tin indium oxide, lanthanum hexaboride, cesium tungsten oxide, etc. it can. This makes it possible to impart machine readability using electromagnetic waves such as ultraviolet light and infrared light without impairing the original visibility of the black watermark.
　本発明で使用される着色剤は常温常圧で液体のような無定形でもよいが、粒子の形態のような定形であってもよい。更に、着色剤（着色材）は繊維の形態であってもよい。 The colorants used in the present invention may be amorphous, such as liquid at ambient temperature and pressure, but may also be fixed, such as in the form of particles. Furthermore, the colorant (coloring material) may be in the form of fibers.
　前記粒子は、特に限定されるものではなく、例えば着色剤を含むシートの粉砕処理や打ち抜き断裁加工、または着色剤を混合した樹脂の造粒加工によって作成することが可能である。 The particles are not particularly limited, and can be produced, for example, by crushing or punching of a sheet containing a colorant, or granulation of a resin mixed with a colorant.
　前記繊維は、特に限定されるものではなく、例えば繊維単体への着色剤の染色加工、または着色剤を混合した樹脂の射出成型による繊維化によって作成することが可能である。 The fiber is not particularly limited, and can be produced, for example, by dyeing a coloring agent into a single fiber, or fiberization by injection molding of a resin mixed with a coloring agent.
前記繊維及び／又は粒子は後述する第２紙層形成工程で紙料と混合されても良いが、紙料と混ぜず単体で使用されても良い。例えば、前記繊維を単体で用いた場合、前記繊維のみで形成された線画調の透かしを作成することが可能である。 The fibers and / or particles may be mixed with the stock in the second paper layer forming step described later, but may be used alone without being mixed with the stock. For example, when the fiber is used alone, it is possible to create a line drawing watermark formed of only the fiber.
　一方、第１紙層１は着色剤を含まないことが好ましい。第１紙層１が着色剤を含まないことにより、透かし部分のみを着色して、透かし部分と周辺部（背景）との境界を更により明瞭とすることができる。また、黒透かし部分と蛍光像等の着色像を良好に一致させることができる。通常、黒透かし部分に着色像を印刷等しても黒透かし部分が構成する画像と着色像を正確に一致させることは困難であるが、本発明では、黒透かし部分が構成する画像と着色像を正確に一致させることが容易である。 On the other hand, it is preferable that the first paper layer 1 does not contain a colorant. Since the first paper layer 1 does not contain a colorant, it is possible to color only the watermark portion and to make the boundary between the watermark portion and the peripheral portion (background) clearer. In addition, the black watermark portion and the colored image such as a fluorescent image can be well matched. Normally, it is difficult to exactly match the image formed by the black watermark portion with the color image even if the color image is printed on the black watermark portion, but in the present invention, the image formed by the black watermark portion and the color image It is easy to match the
　第２紙層２の画像部と非画像部の面積比を任意に規定することができる。例えば、画像部の面積を画像部と非画像部の面積の合計の５０％未満とすることができ、４０％未満が好ましく、３０％未満がより好ましく、２０％未満が更により好ましい。画像部の面積が５０％を下回る場合、画像部はポジ画像となる。この場合、画像部のみを着色することにより、黒透かし像と着色像の完全な一致が可能である。一方、第２紙層２の画像部の面積が画像部と非画像部の面積の合計の５０％を上回る場合、画像部はネガ画像となる。この場合、画像部のみを着色すると、着色部分をバックグラウンドとして非画像部があたかも白透かし像のように見え、しかもその輪郭が鮮明となる効果がある。 The area ratio of the image portion to the non-image portion of the second paper layer 2 can be defined arbitrarily. For example, the area of the image area can be less than 50% of the total area of the image area and the non-image area, preferably less than 40%, more preferably less than 30%, and still more preferably less than 20%. When the area of the image area is less than 50%, the image area becomes a positive image. In this case, complete coloring of the black watermark image and the colored image is possible by coloring only the image portion. On the other hand, when the area of the image area of the second paper layer 2 exceeds 50% of the total area of the image area and the non-image area, the image area becomes a negative image. In this case, when only the image area is colored, the non-image area looks like a white watermark image with the colored area as a background, and the outline becomes sharp.
　本発明の多層紙は、第２紙層の少なくとも一部、例えば全部、を被覆する第３紙層を更に備えることが好ましい。 The multilayer paper of the present invention preferably further comprises a third paper layer which covers at least a part, for example all, of the second paper layer.
第３紙層も紙料を含む。通常、紙料は主にセルロース繊維からなり、例えば、針葉樹晒クラフトパルプ（ＮＢＫＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）、針葉樹晒サルファイトパルプ（ＮＢＳＰ）、サーモメカニカルパルプ（ＴＭＰ）等の木材パルプ；他、麻、竹、藁、ケナフ、三椏、楮、木綿等の非木材パルプ；カチオン化パルプ、マーセル化パルプ等の変性パルプ；レーヨン等の再生セルロース繊維等が挙げられ、これらの１種を単独で又は２種以上を組み合わせて用いることができる。 The third ply also contains stock. Usually, the stock mainly consists of cellulose fibers, for example, wood pulp such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), thermomechanical pulp (TMP), etc .; Other examples include non-wood pulp such as hemp, bamboo, rattan, kenaf, three-pot, rattan and cotton; modified pulp such as cationized pulp and mercerized pulp; regenerated cellulose fibers such as rayon; Or in combination of two or more.
第３紙層はセルロース繊維以外の他の成分を含んでいてもよい。他の成分としては、例えば、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート等の樹脂からなる合成繊維；澱粉、ポリアクリルアミド、ポリアミンポリアミドエピクロルヒドリン等の紙力増強剤又は定着剤；サイズ剤、填料、濾水歩留り向上剤、耐水化剤、定着剤、消泡剤、スライムコントロール剤等が挙げられ、これらの１種を単独で又は２種以上を組み合わせて用いることができる。 The third paper layer may contain other components besides cellulose fibers. Other components include, for example, synthetic fibers made of resins such as polyethylene, polypropylene and polyethylene terephthalate; paper strength or fixing agents such as starch, polyacrylamide and polyamine polyamide epichlorohydrin; sizing agents, fillers, retention of drainage water Water-proofing agents, fixing agents, antifoaming agents, slime control agents, etc. may be mentioned, and one of these may be used alone or in combination of two or more.
図２は第３紙層を備える本発明の多層紙の一態様を示す断面図である。 FIG. 2 is a cross-sectional view showing an aspect of the multilayer paper of the present invention provided with a third paper layer.
　図２に示す態様では、第３紙層３は第２紙層２の全部を被覆しており、これにより、第２紙層２が構成する画像を保護することができ、また、第２紙層２が構成する画像を第３紙層３を通して表現することによって画像の外観を調整することができる。 In the embodiment shown in FIG. 2, the third paper layer 3 covers the whole of the second paper layer 2, whereby the image formed by the second paper layer 2 can be protected, and the second paper The appearance of the image can be adjusted by representing the image formed by the layer 2 through the third paper layer 3.
また、図２に示す態様では、第３紙層３は第１紙層１の全部を被覆している。これにより、第２紙層２を第１紙層１及び第３紙層３で挟んだ形態の多層紙とすることができる。なお、図２では第３紙層３は便宜上水平方向に伸びているが、実際は、第３紙層３は画像の周辺部（背景）において第１紙層１と接触する。したがって、第２紙層２の画像の側面についても良好に保護することができる。 Further, in the embodiment shown in FIG. 2, the third paper layer 3 covers the entire first paper layer 1. As a result, it is possible to obtain multilayer paper in which the second paper layer 2 is sandwiched between the first paper layer 1 and the third paper layer 3. Although the third paper layer 3 extends horizontally in FIG. 2 for the sake of convenience, the third paper layer 3 actually contacts the first paper layer 1 at the peripheral portion (background) of the image. Therefore, the side of the image of the second paper layer 2 can be well protected.
　本発明の多層紙では、従来の黒透かしのように、透かし部分が非画像部（周辺部又は背景）に比して高い不透明度を有する画像部を形成するが、本発明では少なくとも第１紙層及び第２紙層から多層紙を構成しており、第２紙層が当該透かし部分を、第１紙層が非画像部を形成する。このように、本発明では透かし部分（画像部）を構成する層とその他の部分（非画像部：周辺部又は背景）を構成する層を分けることにより、透かし部分とその他の部分の境界を明瞭とすることができる。 The multilayer paper of the present invention forms an image part having high opacity as compared to the non-image part (peripheral part or background) as in the conventional black watermark, but in the present invention, at least the first sheet A multilayer paper is configured from the layer and the second paper layer, and the second paper layer forms the watermark portion and the first paper layer forms the non-image portion. Thus, in the present invention, the boundary between the watermark portion and the other portion is made clear by dividing the layer constituting the watermark portion (image portion) and the layer constituting the other portion (non-image portion: peripheral portion or background). It can be done.
　また、従来の白透かしでは、透かし部分が非透かし部分に対し層が薄くなることにより、例えば、非透かし部分が構成する非画像部に比べ低い不透明度を有する画像部を透かし部分が形成する。そのため、画像部は非画像部に比べ引裂強度などの強度物性が低下する。画像部の強度が非画像部に比べ著しく低い場合、用紙の長期使用の際および印刷や各種加工の際に画像部の脆弱部分に負荷が集中し、破れなどの発生要因となりうる。そのため、非画像部（非透かし部分）に対する画像部（透かし部分）の引裂強度の低下率は３０％未満が好ましく、２０％未満がより好ましく、１０％未満が更により好ましい。 Further, in the conventional white watermark, when the watermark portion is thinner than the non-watermark portion, the watermark portion forms, for example, an image portion having lower opacity than the non-image portion formed by the non-watermark portion. Therefore, in the image area, strength physical properties such as tear strength are lower than in the non-image area. When the strength of the image area is significantly lower than that of the non-image area, the load is concentrated on the fragile area of the image area during long-term use of the sheet and during printing and various processing, which may cause tears and the like. Therefore, the reduction rate of the tear strength of the image portion (watermark portion) relative to the non-image portion (non-watermark portion) is preferably less than 30%, more preferably less than 20%, and still more preferably less than 10%.
　一方、本発明の多層紙では、透かし部分の強度が非透かし部分の強度よりも低下することがないので、透かし部分が形成する画像部の強度は非透かし部分が形成する非画像部の強度よりも低下しない。したがって、本発明の多層紙では画像部の強度不足が原因となって破れなどが生じることはない。 On the other hand, in the multilayer paper of the present invention, the strength of the watermark portion is not lower than the strength of the non-watermark portion, so the strength of the image portion formed by the watermark portion is greater than the strength of the non-image portion formed by the non-watermark portion Not too much. Therefore, in the multilayer paper of the present invention, breakage or the like does not occur due to insufficient strength of the image area.
　前記第３紙層は少なくとも１つの欠損部を含んでもよい。すなわち、第３紙層には少なくとも１つの開口部又は孔が形成されていてもよい。この場合、第３紙層の欠損部を介して第２紙層を外部より視認することができる。したがって、第２紙層が形成する画像を外部より直接確認することができる。 The third paper layer may comprise at least one defect. That is, at least one opening or hole may be formed in the third paper layer. In this case, the second paper layer can be visually recognized from the outside through the missing portion of the third paper layer. Therefore, the image formed by the second paper layer can be confirmed directly from the outside.
本発明の多層紙が第３紙層を備える場合は、第３紙層と第２紙層の間にPETフィルム等を細くスリットしたスレッドを少なくとも１つ挿入することもできる。スレッドとしては、例えば、デメタライズされたホログラム、マイクロ文字を印刷したフィルム、多層干渉フィルム等が挙げられる。前記第３層が欠損部を備え、また、スレッドの少なくとも一部が透明であれば、スレッドの透明部分から第２紙層の透かしが確認でき、より高い偽造防止効果を発現することができる。 When the multilayer paper of the present invention comprises the third paper layer, it is possible to insert at least one thread into which the PET film or the like is thinly slit between the third paper layer and the second paper layer. As the thread, for example, a demetallized hologram, a micro character printed film, a multilayer interference film and the like can be mentioned. If the third layer has a defect and at least a part of the thread is transparent, the watermark of the second paper layer can be confirmed from the transparent portion of the thread, and a higher forgery prevention effect can be exhibited.
本発明の多層紙では、第２紙層で形成される画像をQRコード（登録商標）等の二次元コード、及び／又は、バーコード等の一次元コードといったデータ情報にすることもできる。この場合、第２紙層に形成された透かしの透過光でデータ情報の読み取りが可能となる。印刷で付与されるデータ情報はあくまでも表面上のものであり、反射光で読み取られるが、本発明では、例えば、反射光では読み取らず、一方、透過光で読み取る点で、印刷によるデータ情報と本発明の透かしによるデータ情報の差別化が可能となる。さらに、本発明では通常の透かしよりもシャープなエッジ表現が可能であるために、読み取り性能が優れる。さらに第２紙層に色もしくは填料を付与することによって、よりコントラストを強調し、読み取りをより容易とすることも可能である。 In the multilayer paper of the present invention, the image formed by the second paper layer can also be data information such as a two-dimensional code such as QR code (registered trademark) and / or a one-dimensional code such as a barcode. In this case, the transmitted light of the watermark formed on the second paper layer can read the data information. Although the data information provided by printing is strictly on the surface and is read by reflected light, in the present invention, for example, it is not read by reflected light but by the point of reading by transmitted light. It is possible to differentiate the data information by the watermark of the invention. Furthermore, according to the present invention, since the edge representation is sharper than ordinary watermarks, the reading performance is excellent. It is also possible to enhance the contrast and make the reading easier by applying a color or filler to the second paper layer.
　本発明の第２の態様は、
　前記第１紙層を形成する第１紙層形成工程、及び
前記第１紙層上に第２紙層を形成する第２紙層形成工程
を備えており、
前記第２紙層が非画像部に比して高い不透明度を有する画像部を形成する、
多層紙の製造方法である。 The second aspect of the present invention is
The method includes a first paper layer forming step of forming the first paper layer, and a second paper layer forming step of forming a second paper layer on the first paper layer,
The second paper layer forms an image portion having high opacity as compared to the non-image portion.
It is a manufacturing method of multilayer paper.
　本発明の製造方法は、例えば、図３に示すような２槽式の円網抄紙機を使用して実施することができる。 The production method of the present invention can be carried out using, for example, a two-tank-type cylinder paper machine as shown in FIG.
　図３に示す２槽式の円網抄紙機を使用する場合は、通常の上網を有する第１円網シリンダー４ａ及び第１ローラー４ｂを備える第１槽４において第１紙層１を抄紙法により形成し毛布７上に転写する。第１槽４で使用される紙料・添加剤は上記のとおりであるが、着色剤を含まないことが好ましい。 In the case of using a two-tank-type circular mesh paper machine shown in FIG. 3, the first paper layer 1 is made by the paper making method in the first tank 4 provided with the first circular mesh cylinder 4a and the first roller 4b having a usual upper mesh. Form and transfer onto blanket 7. Although the stock and additives used in the first tank 4 are as described above, it is preferable not to contain a colorant.
一方、第２円網シリンダー５ａ及び第２ローラー５ｂを備える第２槽５の第２円網シリンダー５ａの上網５ｃの表面には、図４に示すように、表現対象の画像に対応する欠損部１１ａを有するように感光性樹脂が塗布されており、欠損部１１ａ以外の箇所の上網の目は感光性樹脂に塞がれている。なお、感光性樹脂は紫外線等の照射により固化（硬化）されて型１１を構成している。 On the other hand, on the surface of the upper net 5c of the second circular mesh cylinder 5a of the second tank 5 provided with the second circular mesh cylinder 5a and the second roller 5b, as shown in FIG. The photosensitive resin is applied so as to have 11a, and the upper mesh of the portion other than the defect portion 11a is closed by the photosensitive resin. The photosensitive resin is solidified (cured) by irradiation of ultraviolet light or the like to form the mold 11.
図４において、型１１はアルファベットの「Ａ」を画像として表現しているが、その他に、例えば、型１１はQRコード（登録商標）等の二次元コード、バーコード等の一次元コードといったデータ情報を表現してもよい。 In FIG. 4, the type 11 expresses the alphabet “A” as an image, but in addition, for example, the type 11 is data such as a two-dimensional code such as QR code (registered trademark) or a one-dimensional code such as a barcode It may represent information.
　図３に示す態様では、第２槽５において、第２円網シリンダー５ａの上網５ｃの表面の型１１の部分では、欠損部１１ａのみにおいて紙料の通過が可能となるために、欠損部１１ａのみにおいて紙層が形成される。したがって、図３に示す態様では、欠損部１１ａの形状に応じた画像パターンを有する第２紙層２を抄紙法により形成することができ、第２紙層２は毛布７上の第１紙層１の上に転写される。 In the embodiment shown in FIG. 3, in the second tank 5, in the portion of the mold 11 on the surface of the upper mesh 5c of the second circular mesh cylinder 5a, the stock can be allowed to pass only in the defective portion 11a. The paper layer is formed only in Therefore, in the embodiment shown in FIG. 3, the second paper layer 2 having an image pattern corresponding to the shape of the defect portion 11 a can be formed by paper making, and the second paper layer 2 is the first paper layer on the blanket 7. It is transferred onto one.
　これにより、図１（Ｂ）に示す断面形状を有する本発明の多層紙を製造することができる。 Thereby, the multilayer paper of the present invention having the cross-sectional shape shown in FIG. 1 (B) can be manufactured.
　なお、図３に示す態様では、第２槽５で使用される紙料・添加剤は上記のとおりであるが、着色剤を含むことが好ましい。 In the embodiment shown in FIG. 3, the stock and additives used in the second tank 5 are as described above, but it is preferable to contain a colorant.
　また、欠損部を有する型を上網に取り付ける他に、画像のパターンに沿って上網５ｃの網目を樹脂等で充填してもよい。この場合は充填された部分の網目では紙料の通過が阻害され、紙層が形成されない。 Further, in addition to attaching the mold having the defect portion to the upper mesh, the mesh of the upper mesh 5c may be filled with a resin or the like along the pattern of the image. In this case, in the mesh of the filled portion, the passage of the stock is inhibited and the paper layer is not formed.
　一方、第３紙層３を備える本発明の多層紙は、例えば、図５に示すような３槽式の円網抄紙機を使用して実施することができる。さらには、長網もしくは円網とのコンビネーションの抄紙機を使用して実施しても構わない。 On the other hand, the multilayer paper of the present invention provided with the third paper layer 3 can be carried out using, for example, a three-tank-type circular screen paper machine as shown in FIG. Furthermore, it may be carried out using a paper machine in combination with a long net or a circular net.
　図５に示す態様では、図３に示す態様の２槽式の円網抄紙機の下流側に、通常の上網を有する第３円網シリンダー６ａ及び第３ローラー６ｂを備える第３槽６が設けられており、第３槽６において第３紙層３を抄紙法により形成して、毛布７上の第２紙層２の上に転写する。第３槽６で使用される紙料・添加剤は上記のとおりであるが、着色剤を含まないことが好ましい。 In the embodiment shown in FIG. 5, the third tank 6 provided with the third cylinder cylinder 6a and the third roller 6b having the usual upper mesh is provided on the downstream side of the two-tank type cylinder paper machine of the embodiment shown in FIG. The third paper layer 3 is formed by the paper making method in the third tank 6 and transferred onto the second paper layer 2 on the blanket 7. Although the stock and additives used in the third tank 6 are as described above, it is preferable that they do not contain a colorant.
　これにより、図２に示す断面形状を有する本発明の多層紙を製造することができる。 Thereby, the multilayer paper of the present invention having the cross-sectional shape shown in FIG. 2 can be manufactured.
第３槽には、表面の一部に感光性樹脂が塗布・固化された網を備えたシリンダーを用いることもできる。この場合には、感光性樹脂が塗布・固化された部分は紙料が付着しないので、第３紙層の少なくとも一部に欠損部が形成され、当該欠損部から第２紙層を露出させることができる。第３紙層の被覆の有無により第２紙層のコントラストは変化し、且つ、第２紙層により形成される透かし像は第３紙層の被覆の有無にかかわらず連続しているため、より高い偽造防止効果を発現することができる。 For the third tank, it is also possible to use a cylinder provided with a net in which a photosensitive resin is applied and solidified on part of the surface. In this case, since the portion to which the photosensitive resin is applied and solidified does not adhere to the stock, a defective portion is formed in at least a part of the third paper layer, and the second paper layer is exposed from the defective portion. Can. The contrast of the second paper layer changes depending on the presence or absence of the coating on the third paper layer, and the watermark image formed by the second paper layer is continuous regardless of the presence or absence of the coating on the third paper layer. A high anti-counterfeit effect can be exhibited.
また、第３紙層と第２紙層の間に少なくとも１つのスレッドを挿入する工程を設けることもできる。スレッドとしては既述したものを少なくとも１つ使用することができる。これにより、より高い偽造防止効果を発現することができる。 There may also be a step of inserting at least one thread between the third and the second paper layer. At least one of the threads described above can be used. Thereby, a higher forgery prevention effect can be exhibited.
　本発明の多層紙は透かし部分を有するので、偽造防止用紙として好適に使用可能である。すなわち、本発明の多層紙は、商品券、入場券、パスポート、有価証券等の偽造防止が求められる印刷物に使用される、印刷用紙として特に有用である。 Since the multilayer paper of the present invention has a watermark portion, it can be suitably used as an anti-counterfeit paper. That is, the multilayer paper of the present invention is particularly useful as a printing paper used for printed matter required to prevent forgery such as gift certificates, admission tickets, passports, securities and the like.
　以下、本発明を実施例及び比較例を用いてより具体的に説明するが、本発明の範囲は実施例に限定されるものではない。 Hereinafter, the present invention will be more specifically described using examples and comparative examples, but the scope of the present invention is not limited to the examples.
紙料の調製
ＮＢＫＰ２０重量部，ＬＢＫＰ８０重量部を３５０ｍｌＣ．Ｓ．Ｆ．に叩解し、これに紙力増強剤（商品名「ポリストロン１９１」、荒川化学工業（株）製）０．３重量部、サイズ剤（商品名「サイズパインＥ」、荒川化学工業（株）製）１．０重量部、硫酸バンドを適量加え紙料を調製した。 Preparation of stock: 20 parts by weight of NBKP, 80 parts by weight of LBKP: 350 ml C.I. S. F. The paper strength agent (trade name "Polistron 191", Arakawa Chemical Industries, Ltd.) 0.3 parts by weight, sizing agent (trade name "Sized Pine E", Arakawa Chemical Co., Ltd.) An appropriate amount of a sulfuric acid band was added to 1.0 part by weight of a product to prepare a stock.
抄紙網の製造
抄紙用のシリンダー網に対し、全面に感光性樹脂を塗布し、画像部となる箇所を覆い隠したまま露光することで感光性樹脂を固化し、さらに洗浄により固化していない樹脂を除去することにより、画像部となる箇所の感光性樹脂のみが除去され欠損部となり、それ以外の箇所は全て固化した感光性樹脂により網目が埋まった状態の凹型付き抄造網を作成した。 Production of papermaking mesh A photosensitive resin is applied to the entire surface of a cylinder mesh for papermaking, and the photosensitive resin is solidified by exposing while covering a portion to be an image portion, and the resin is not solidified by washing. By removing the photosensitive resin, only the photosensitive resin in the portion to be the image portion was removed to become a defective portion, and the recessed resin sheet was formed in a state in which the mesh was buried by the photosensitive resin solidified in all other portions.
実施例１
図５に示すような３槽式円網抄紙機の第１槽４及び第３槽６の円網シリンダー４ａ、６ａには何ら細工を施さない網を装着し、第２槽５の円網シリンダー５ａには上記凹型付き抄造網（図４中の型１１を取り付けた網５ｃに対応）を装着した。第１槽４で毛布７に形成した第１紙層１（最下層）上に第２槽５で形成した第２紙層２（中間層）が重なり、更に、第２紙層２上に第３槽６で形成した第３紙層３（最上層）が重なるようにして、前記紙料を用いて抄紙速度５０ｍ／分で３層抄合わせを行い１００ｇ／ｍ２の用紙を製造した。次いで定法に従い湿紙を脱水後、シリンダードライヤで乾燥し、図２に示すような３層抄き合わせ紙からなる偽造防止用紙を製造した。 Example 1
As shown in FIG. 5, a net without any work is attached to the circular mesh cylinders 4 a and 6 a of the first tank 4 and the third tank 6 of the three-tank type circular paper machine, and the circular mesh cylinder of the second tank 5. The above-mentioned concave-coated papermaking mesh (corresponding to the mesh 5c attached with the mold 11 in FIG. 4) was attached to 5a. The second paper layer 2 (intermediate layer) formed in the second tank 5 overlaps the first paper layer 1 (lowermost layer) formed in the blanket 7 in the first tank 4, and the second paper layer 2 further As the third paper layer 3 (uppermost layer) formed in the third tank 6 overlapped, the paper stock was used to make three-layer paper making at a paper making speed of 50 m / min to produce a 100 g / m 2 paper. Then, the wet paper was dewatered in accordance with a conventional method, and then dried with a cylinder drier to produce a forgery-preventing paper comprising a three-layer laminated paper as shown in FIG.
得られた偽造防止用紙には、厚くなった部分を有する紙層が形成されており、透過光で観察すると、紙層の厚くなった部分により形成された画像パターンが不透明度の差により黒く見える黒透かしが発現した。得られた黒透かしは一般的な黒透かしに比べ、透かしの端部がよりシャープであった。また、得られた用紙の縦の引裂強度をＪＩＳ　Ｐ８１１６に準じてエルメンドルフ形引裂試験機で比較したところ、非透かし部分の引裂強度が６６２ｍＮであり、透かし部分の引裂強度が６７２ｍＮであり、透かし部分と透かし無しの部分の引裂強度は同等であった。 A paper layer having thickened portions is formed on the obtained anti-counterfeit paper, and the image pattern formed by the thickened portions of the paper layer looks black due to the difference in opacity when observed with transmitted light. Black watermark appeared. The obtained black watermark was sharper at the end of the watermark than a general black watermark. Further, when the longitudinal tear strength of the obtained sheet is compared with an Elmendorf type tear tester according to JIS P8116, the tear strength of the non-watermark portion is 662 mN, the tear strength of the watermark portion is 672 mN, and the watermark portion The tear strength of the part without and the watermark was equal.
実施例２
３槽式円網抄紙機の第２槽５の紙料のみの原料をLBKP１００重量部とし、それ以外は実施例１と同様の方法で偽造防止用紙を製造した。 Example 2
The raw material only for the stock of the second tank 5 of the three-tank cylinder net papermaking machine was made to be 100 parts by weight of LBKP, and the anti-counterfeit paper was manufactured in the same manner as Example 1 except the above.
得られた偽造防止用紙は、実施例１と比べ透かしの端部がよりシャープであった。なお、引裂強度などの強度物性は実施例１とほぼ同等であった。 The obtained anti-counterfeit paper had a sharper end of the watermark as compared with Example 1. The strength properties such as tear strength were almost the same as in Example 1.
実施例３
３槽式円網抄紙機の第２槽５のみに紙料の固形分１００重量部に対して１０重量部の割合で炭酸カルシウムを添加し、それ以外は実施例１と同様の方法で偽造防止用紙を製造した。 Example 3
Calcium carbonate is added in a proportion of 10 parts by weight to 100 parts by weight of the solid content of the paper stock only in the second tank 5 of the 3-tank type cylinder paper machine, and the forgery prevention is the same as in Example 1 except for that. Paper was manufactured.
得られた偽造防止用紙は、実施例１に比べ透かし部の不透明度が向上しており、より明暗のはっきりした透かしが得られた。 The obtained anti-counterfeit paper had the opacity of the watermark portion improved as compared with Example 1, and a brighter and darker watermark was obtained.
実施例４
３槽式円網抄紙機の第２槽５の紙料のみに着色染料（赤色）を添加し、それ以外は実施例１と同様の方法で偽造防止用紙を製造した。 Example 4
A colored dye (red) was added only to the stock of the second tank 5 of the three-tank type cylinder paper machine, and the anti-counterfeit paper was manufactured in the same manner as in Example 1 except for this.
得られた偽造防止用紙は、実施例１と同様に透過光で観察すると画像パターンが不透明度の差により黒く見える黒透かしが発現した。さらに黒透かし部分のみ着色染料で染色されており、斜光もしくは透過光で見たときに赤く見えるカラー透かしが形成されていた。透かしの端部はシャープであった。 The obtained anti-counterfeit paper exhibited a black watermark in which the image pattern appeared black due to the difference in opacity when observed with transmitted light as in Example 1. Furthermore, only the black watermark portion was stained with a coloring dye, and a color watermark that appeared red when viewed in oblique light or transmitted light was formed. The end of the watermark was sharp.
実施例５
３槽式円網抄紙機の第２槽５の紙料のみに蛍光染料を添加し、それ以外は実施例１と同様の方法で偽造防止を製造した。 Example 5
A fluorescent dye was added only to the stock of the second tank 5 of the three-tank cylinder net paper machine, and anti-counterfeit was manufactured in the same manner as in Example 1 except for the above.
得られた偽造防止用紙は、実施例１と同様に透過光で観察すると画像パターンが不透明度の差により黒く見える黒透かしが発現した。さらに黒透かし部分のみ蛍光染料で染色されており、ブラックライトを照射することで、黒透かし部分のみ特異的に蛍光発光を示した。透かしの端部はシャープであった。 The obtained anti-counterfeit paper exhibited a black watermark in which the image pattern appeared black due to the difference in opacity when observed with transmitted light as in Example 1. Furthermore, only the black watermark portion was stained with the fluorescent dye, and by irradiating the black light, only the black watermark portion showed fluorescence emission specifically. The end of the watermark was sharp.
実施例６
３槽式円網抄紙機の第２槽５の紙料のみに酸化チタンを添加し、それ以外は実施例１と同様の方法で偽造防止を製造した。 Example 6
Titanium oxide was added only to the stock of the second tank 5 of the 3-tank type cylinder paper machine, and anti-counterfeit was manufactured in the same manner as in Example 1 except for this.
得られた偽造防止用紙は、実施例１と同様に透過光で観察すると画像パターンが不透明度の差により黒く見える黒透かしが発現した。さらに赤外線カメラで観察すると、透かし部分のみに透かしと同様の像が出現した。透かしの端部はシャープであった。 The obtained anti-counterfeit paper exhibited a black watermark in which the image pattern appeared black due to the difference in opacity when observed with transmitted light as in Example 1. Furthermore, when it observed with an infrared camera, the image similar to a watermark appeared only in the watermark part. The end of the watermark was sharp.
実施例７
３槽式円網抄紙機の第２槽５の紙料のみに蛍光顔料を造粒して形成した蛍光粒子を添加し、それ以外は実施例１と同様の方法で偽造防止を製造した。 Example 7
The fluorescent particles formed by granulating the fluorescent pigment were added only to the stock of the second tank 5 of the 3-tank type cylinder paper machine, and the forgery prevention was manufactured in the same manner as in Example 1 except for this.
得られた偽造防止用紙は、実施例１と同様に透過光で観察すると画像パターンが不透明度の差により黒く見える黒透かしが発現した。さらに黒透かし部分のみ蛍光粒子が分散して存在しており、ブラックライトを照射することで、黒透かし部分のみ特異的に蛍光発光を示した。透かしの端部はシャープであった。 The obtained anti-counterfeit paper exhibited a black watermark in which the image pattern appeared black due to the difference in opacity when observed with transmitted light as in Example 1. Furthermore, the fluorescent particles were dispersed and present only in the black watermark portion, and by irradiating the black light, only the black watermark portion showed fluorescence emission specifically. The end of the watermark was sharp.
実施例８
３槽式円網抄紙機の第２槽５の紙料のみに着色繊維及び蛍光繊維を、それ以外は実施例１と同様の方法で偽造防止を製造した。 Example 8
Colored fibers and fluorescent fibers were produced only in the stock of the second tank 5 of the 3-tank type cylinder paper machine, and anti-counterfeit was manufactured in the same manner as in Example 1 except for the above.
得られた偽造防止用紙は、実施例１と同様に透過光で観察すると画像パターンが不透明度の差により黒く見える黒透かしが発現した。さらに黒透かし部分のみ着色繊維と蛍光繊維が混抄されており、可視光化では、黒透かし部分のみに特異的に着色繊維が観察され、さらにブラックライトを照射することで、黒透かし部分のみ特異的に蛍光繊維が観察された。透かしの端部はシャープであった。 The obtained anti-counterfeit paper exhibited a black watermark in which the image pattern appeared black due to the difference in opacity when observed with transmitted light as in Example 1. Furthermore, colored fibers and fluorescent fibers are mixed together only in the black watermark portion, and in visible light, colored fibers are observed specifically only in the black watermark portion, and further only the black watermark portion is specific by irradiating the black light. Fluorescent fibers were observed. The end of the watermark was sharp.
実施例９
３槽式円網抄紙機の第２槽５の原料を着色繊維のみとし、それ以外は実施例１と同様の方法で偽造防止を製造した。 Example 9
The forgery prevention was manufactured by the method similar to Example 1 excepting that only the colored fiber was used as the raw material of the second tank 5 of the three-tank type cylinder paper machine.
得られた偽造防止用紙は、可視光で観察すると着色繊維のみで形成されたシャープな線画調の透かしが発現した。得られた線画調の透かしは、紙の層内に封入されているため、表裏から観察可能であった。さらに形成される線はランダム性を有していた。 The obtained anti-counterfeit paper exhibited a sharp line drawing-like watermark formed of only colored fibers when observed with visible light. The obtained line drawing tone watermark was observed in the front and back because it was enclosed in the paper layer. The lines formed were also random.
実施例１０
３槽式円網抄紙機の第２槽５の原料を着色繊維のみとし、さらに第３槽６の円網シリンダー６ａには凸型（型の部分に紙料が付着せず欠損部となる）を取り付けた網を設置し、それ以外は実施例１と同様の方法で偽造防止を製造した。 Example 10
The raw material of the second tank 5 of the three-tank type cylinder paper machine is only colored fiber, and the convex cylinder (the stock does not adhere to the part of the mold without being attached to the part of the mold) Were installed, and anti-counterfeit was manufactured in the same manner as in Example 1 except for that.
得られた偽造防止用紙は、第３紙層に欠損部が形成されており、第２紙層で形成された透かしの一部が第３紙層の欠損部から表面に露出していた。さらに、第２紙層で形成された透かしは第３紙層の欠損部と隣接する非欠損部にかけて連続しており、且つ、形成された線の色のコントラストが欠損部と非欠損部で異なる視認性が発現した。 In the obtained anti-counterfeit paper, a defective portion was formed in the third paper layer, and a part of the watermark formed in the second paper layer was exposed to the surface from the defective portion of the third paper layer. Furthermore, the watermark formed by the second paper layer is continuous to the non-defective portion adjacent to the defective portion of the third paper layer, and the color contrast of the formed line is different between the deficient portion and the non-defective portion Visibility was expressed.
実施例１１
３槽式円網抄紙機の第２紙層と第３紙層の間にフィルムの少なくとも一部が透明なスレッドを挿入し、それ以外は実施例１０と同様の方法で偽造防止を製造した。 Example 11
A forgery prevention was manufactured in the same manner as in Example 10 except that a thread in which at least a part of the film was transparent was inserted between the second paper layer and the third paper layer of the three-tank type cylinder paper machine.
得られた偽造防止用紙は、第３紙層の欠損部から抄き込まれたスレッドが確認された。さらにスレッドの一部は第２紙層で形成された透かしの一部に被っており、スレッドの透明部分越しに第２紙層で形成された透かしが確認された。 The obtained anti-counterfeit paper was confirmed to have threads inserted from the missing part of the third paper layer. Furthermore, a part of the thread covered a part of the watermark formed in the second paper layer, and the watermark formed in the second paper layer was confirmed over the transparent portion of the thread.
実施例１２
３槽式円網抄紙機の第２槽５の紙料のみに着色染料（黒色）を添加し、また使用する透かしにはQRコード（登録商標）を付与し、それ以外は実施例１と同様の方法で偽造防止用紙を製造した。 Example 12
A coloring dye (black) is added only to the stock of the second tank 5 of the 3-tank type cylinder paper machine, and a QR code (registered trademark) is given to the watermark to be used. Manufacture of anti-counterfeit paper by the method of
得られた偽造防止用紙は、QRコード（登録商標）の形状を有する見える黒透かしが発現した。透過光を使用することにより、スマートフォンによる、QRコード（登録商標）の読み取りが可能であった。 The obtained anti-counterfeit paper exhibited a visible black watermark having the shape of QR code (registered trademark). By using the transmitted light, it was possible to read the QR code (registered trademark) by the smartphone.
実施例１３
　第３槽６での抄合わせを行わない以外は実施例１と同様の方法で図１（Ｂ）に示すような２層抄き合わせ紙からなる偽造防止用紙を製造した。得られた偽造防止用紙は紙層の厚くなった部分を有しており、透過光で観察すると、紙層の厚くなった部分により形成された画像パターンが不透明度の差により黒く見える黒透かしが発現した。得られた黒透かしによる画像パターンは一般的な黒透かしによる画像パターンに比べ、端部がよりシャープであった。 Example 13
In the same manner as in Example 1 except that the papermaking in the third tank 6 was not performed, a forgery-preventing paper made of a two-layer laminated paper as shown in FIG. 1 (B) was manufactured. The obtained anti-counterfeit paper has a thickened portion of the paper layer, and when observed with transmitted light, a black watermark appears that the image pattern formed by the thickened portion of the paper layer appears black due to the difference in opacity. It was expressed. The image pattern by the obtained black watermark was sharper at the end compared with the image pattern by the general black watermark.
比較例１
図５に示す３槽式円網抄紙機の第１槽４及び第２槽５の円網シリンダー４ａ、５ａには何ら細工を施さない網を装着し、第３槽６の円網シリンダー６ａには凸型（型の部分に紙料があまり付着せず薄い紙層となる）を取り付けた網を設置し、それ以外は実施例１と同様の方法で偽造防止用紙を製造した。 Comparative Example 1
A net without any work is attached to the circular mesh cylinders 4a and 5a of the first tank 4 and the second tank 5 of the three-tank-type cylinder paper machine shown in FIG. 5, and the circular mesh cylinder 6a of the third tank 6 is mounted. A net having a convex type (with a small amount of paper not attached to the portion of the mold to form a thin paper layer) attached was installed, and the anti-counterfeit paper was manufactured in the same manner as in Example 1 except for this.
得られた偽造防止用紙は、薄い紙層を有する部分が形成され、透過光で観察すると当該部分が不透明度の差により白く見える白透かしが発現した。また、得られた用紙の縦の引裂強度をＪＩＳ　Ｐ８１１６に準じてエルメンドルフ形引裂試験機で比較したところ、非透かし部分の引裂強度が７２３ｍＮであるのに対し透かし部分の引裂強度が４７２ｍＮとなり、透かし部分の引裂強度が３０％以上低下した。 The resulting anti-counterfeit paper formed a portion having a thin paper layer, and when observed with transmitted light, a white watermark appeared that appeared to be white due to the difference in opacity. Also, when the longitudinal tear strength of the obtained paper is compared with an Elmendorf-type tear tester according to JIS P8116, the tear strength of the non-watermark portion is 723 mN while the tear strength of the watermark portion is 472 mN. The tear strength of the part decreased by 30% or more.
比較例２
図５に示す３槽式円網抄紙機の第１槽４の円網シリンダー４ａに網の一部の加工により網自体を凹ませた凹型付き抄造網を設置し、且つ、第２槽５及び第３槽６での抄合わせを行わない以外は実施例１と同様の方法で偽造防止用紙を製造した。 Comparative example 2
A concave-shaped paper-making net, in which the net itself is recessed by processing a part of the net, is installed in the circular mesh cylinder 4a of the first tank 4 of the three-tank-type circular net paper machine shown in FIG. Anti-counterfeit paper was manufactured in the same manner as in Example 1 except that the papermaking in the third tank 6 was not performed.
　得られた偽造防止用紙は紙層の厚くなった部分を有する層が形成され、透過光で観察するとパターン部分が不透明度の差により黒く見える黒透かしが発現した。しかし、本方式による黒透かしは実施例１に記載の黒透かし製造方法に比べ、透かしの端部がぼやけシャープさは低下した。 The obtained anti-counterfeit paper formed a layer having a thickened portion of the paper layer, and when observed with transmitted light, a black watermark appeared that the pattern portion appeared black due to the difference in opacity. However, as compared with the black watermark manufacturing method according to the first embodiment, the black watermark according to the present system has a blur at the end of the watermark and the sharpness is reduced.

Claims (28)

  1. 　第１紙層及び第２紙層を備える多層紙であって、
    前記第２紙層が非画像部に比して高い不透明度を有する画像部を形成する、
    多層紙。     A multilayer paper comprising a first paper layer and a second paper layer, wherein
    The second paper layer forms an image portion having high opacity as compared to the non-image portion.
    Multilayer paper.
  2. 　前記第２紙層の組成が前記第１紙層の組成とは異なる、請求項１に記載の多層紙。 The multilayer paper of claim 1, wherein the composition of the second paper layer is different than the composition of the first paper layer.
  3. 　前記第２紙層に含まれる繊維の種類又は含量が前記第１紙層に含まれる繊維の種類又は含量とは異なる、請求項２に記載の多層紙。 The multilayer paper according to claim 2, wherein the type or content of fibers contained in the second paper layer is different from the type or content of fibers contained in the first paper layer.
  4. 　前記第２紙層に含まれる填料の種類又は含量が前記第１紙層に含まれる填料の種類又は含量とは異なる、請求項２に記載の多層紙。 The multilayer paper according to claim 2, wherein the type or content of the filler contained in the second paper layer is different from the type or the content of the filler contained in the first paper layer.
  5. 　前記第２紙層が着色剤を含む、請求項１～４のいずれかに記載の多層紙。 A multilayer paper according to any of the preceding claims, wherein the second paper layer comprises a colorant.
  6. 　前記着色剤が染料及び／又は顔料である、請求項５記載の多層紙。 The multilayer paper according to claim 5, wherein the colorant is a dye and / or a pigment.
  7. 　前記染料が蛍光染料である、請求項６記載の多層紙。 7. The multilayer paper of claim 6, wherein the dye is a fluorescent dye.
  8. 　前記顔料が蛍光顔料である、請求項６又は７記載の多層紙。 The multilayer paper according to claim 6 or 7, wherein the pigment is a fluorescent pigment.
  9. 　前記第１紙層が前記着色剤を含まない、請求項５～８のいずれかに記載の多層紙。 A multilayer paper according to any of claims 5 to 8, wherein the first paper layer is free of the colorant.
  10. 　前記第２紙層が着色繊維又は蛍光繊維を含む、請求項１～９のいずれかに記載の多層紙。 A multilayer paper according to any of the preceding claims, wherein the second paper layer comprises colored fibers or fluorescent fibers.
  11. 　前記第１紙層が前記着色繊維又は前記蛍光繊維を含まない、請求項１０記載の多層紙。 The multilayer paper according to claim 10, wherein the first paper layer does not contain the colored fibers or the fluorescent fibers.
  12. 　前記第２紙層の少なくとも一部を被覆する第３紙層を更に備える、請求項１～１１のいずれかに記載の多層紙。 The multilayer paper according to any one of claims 1 to 11, further comprising a third paper layer covering at least a part of the second paper layer.
  13. 　前記第３紙層が少なくとも１つの欠損部を含む、請求項１２記載の多層紙。 The multilayer paper according to claim 12, wherein the third paper layer comprises at least one defect.
  14. 　前記第２紙層及び前記第３紙層の間に少なくとも１つのスレッドを含む、請求項１２又は１３記載の多層紙。 14. A multilayer paper according to claim 12 or 13, comprising at least one thread between the second paper layer and the third paper layer.
  15. 　前記第２紙層に形成された前記画像部がデータ情報を表す、請求項１～１４のいずれかに記載の多層紙。 A multi-layer paper according to any of the preceding claims, wherein the image portion formed on the second paper layer represents data information.
  16. 　前記第１紙層を形成する第１紙層形成工程、及び
    前記第１紙層上に第２紙層を形成する第２紙層形成工程
    を備えており、
    前記第２紙層が非画像部に比して高い不透明度を有する画像部を形成する、
    多層紙の製造方法。     The method includes a first paper layer forming step of forming the first paper layer, and a second paper layer forming step of forming a second paper layer on the first paper layer,
    The second paper layer forms an image portion having high opacity as compared to the non-image portion.
    Method of manufacturing multilayer paper.
  17. 　前記第２紙層形成工程が、
    前記第１紙層上に、前記画像部のパターンに紙料を配置することで前記第２紙層を形成する、請求項１６記載の多層紙の製造方法。     The second paper layer forming step
    The method according to claim 16, wherein the second paper layer is formed on the first paper layer by arranging a stock in the pattern of the image area.
  18. 　前記第２紙層が着色剤を含む、請求項１６又は１７記載の多層紙の製造方法。 18. A method of making a multilayer paper according to claim 16 or 17, wherein the second paper layer comprises a colorant.
  19. 　前記着色剤が染料及び／又は顔料である、請求項１８記載の多層紙の製造方法。 The method for producing a multilayer paper according to claim 18, wherein the coloring agent is a dye and / or a pigment.
  20. 　前記染料が蛍光染料である、請求項１９記載の多層紙の製造方法。 The method for producing a multilayer paper according to claim 19, wherein the dye is a fluorescent dye.
  21. 　前記顔料が蛍光顔料である、請求項１９又は２０記載の多層紙の製造方法。 21. A method of making a multilayer paper according to claim 19 or 20, wherein the pigment is a fluorescent pigment.
  22. 　前記第１紙層が前記着色剤を含まない、請求項１８～２１のいずれかに記載の多層紙の製造方法。 The method for producing a multilayer paper according to any of claims 18 to 21, wherein the first paper layer does not contain the colorant.
  23. 　前記第２紙層が着色繊維又は蛍光繊維を含む、請求項１６～２２のいずれかに記載の多層紙の製造方法。 The method for producing a multilayer paper according to any of claims 16 to 22, wherein the second paper layer comprises colored fibers or fluorescent fibers.
  24. 　前記第１紙層が前記着色繊維又は前記蛍光繊維を含まない、請求項２３記載の多層紙の製造方法。 The method for producing a multilayer paper according to claim 23, wherein the first paper layer does not contain the colored fibers or the fluorescent fibers.
  25. 　前記第２紙層の少なくとも一部の上に第３紙層を形成する第３紙層形成工程を更に含む、請求項１６～２４のいずれかに記載の多層紙の製造方法。 The method for producing a multilayer paper according to any of claims 16 to 24, further comprising a third paper layer forming step of forming a third paper layer on at least a part of the second paper layer.
  26. 　前記第３紙層が少なくとも１つの欠損部を含む、請求項２５記載の多層紙の製造方法。 26. A method of making a multilayer paper according to claim 25, wherein the third paper layer comprises at least one defect.
  27. 　前記第２紙層及び前記第３紙層の間に少なくとも１つのスレッドを配設する工程を含む、請求項２５又は２６記載の多層紙の製造方法。 27. A method of making a multilayer paper according to claim 25 or 26, comprising the step of disposing at least one thread between the second paper layer and the third paper layer.
  28. 　前記第２紙層に形成された前記画像部がデータ情報を表す、請求項１６～２７のいずれかに記載の多層紙。 A multilayer paper according to any of claims 16 to 27, wherein the image portion formed on the second paper layer represents data information.
PCT/JP2018/032440 2017-09-14 2018-08-31 Multilayer paper and method for producing same WO2019054207A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5378207U (en) * 1976-11-19 1978-06-29
JPH09316796A (en) * 1996-05-29 1997-12-09 Tokushu Paper Mfg Co Ltd Production of paper for preventing counterfeit
WO2007042637A1 (en) * 2005-10-06 2007-04-19 Banque De France Method for producing a sheet of fibrous material comprising localized portions of fibrous material
CN101748660A (en) * 2008-12-01 2010-06-23 中国印钞造币总公司 Anti-counterfeit water marked paper and manufacturing method thereof
CN102373642A (en) * 2011-11-10 2012-03-14 保定钞票纸业有限公司 Two-dimension code watermark anti-counterfeiting paper and manufacture method thereof,as well as watermark cylinder mould
JP2016194181A (en) * 2015-03-31 2016-11-17 特種東海製紙株式会社 Forgery prevention sheet and production method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5378207U (en) * 1976-11-19 1978-06-29
JPH09316796A (en) * 1996-05-29 1997-12-09 Tokushu Paper Mfg Co Ltd Production of paper for preventing counterfeit
WO2007042637A1 (en) * 2005-10-06 2007-04-19 Banque De France Method for producing a sheet of fibrous material comprising localized portions of fibrous material
CN101748660A (en) * 2008-12-01 2010-06-23 中国印钞造币总公司 Anti-counterfeit water marked paper and manufacturing method thereof
CN102373642A (en) * 2011-11-10 2012-03-14 保定钞票纸业有限公司 Two-dimension code watermark anti-counterfeiting paper and manufacture method thereof,as well as watermark cylinder mould
JP2016194181A (en) * 2015-03-31 2016-11-17 特種東海製紙株式会社 Forgery prevention sheet and production method thereof

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