JP2008291396A - Anti-counterfeit paper - Google Patents

Anti-counterfeit paper Download PDF

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JP2008291396A
JP2008291396A JP2007138790A JP2007138790A JP2008291396A JP 2008291396 A JP2008291396 A JP 2008291396A JP 2007138790 A JP2007138790 A JP 2007138790A JP 2007138790 A JP2007138790 A JP 2007138790A JP 2008291396 A JP2008291396 A JP 2008291396A
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paper
layer
pigment
multilayer
printed
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JP4873349B2 (en
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Eiji Kawamura
英司 河村
Tadashi Morinaga
匡 森永
Noriyuki Shiga
敬之 志賀
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National Printing Bureau
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Abstract

<P>PROBLEM TO BE SOLVED: To provide anti-counterfeit paper by which a color pattern or symbol is not recognized by eyesight with reflected light, but is recognized with a transmitted light. <P>SOLUTION: In multiple-layered paper 1 constituted by an upper part paper layer 2, a lower part paper layer and an intermediate layer of at least one layer, the intermediate layer 4 constituted of at least one layer 5 formed with a symbol in ink having a pearl pigment 7 and a colored pigment 6 which are complementary to each other or have an approximately complementary relationship, and the upper part paper layer 2 and lower part paper layer 3 have an opacity of 40 to 90%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、上部紙層と下部紙層が接する一方の紙層面又は上部紙層と下部紙層の間に抄き込まれた中間層の一方の面に、文字や図形が印刷されて成る多層紙に関するものである。   The present invention relates to a multilayer in which characters and figures are printed on one paper layer surface where an upper paper layer and a lower paper layer are in contact or one surface of an intermediate layer formed between the upper paper layer and the lower paper layer. It is about paper.

紙幣、パスポート、有価証券、貴重印刷物等には偽造防止のために、すかしを施した用紙、機能性繊維を抄き込んだ用紙及びスレッドを抄き込んだ用紙等が製造されている。その中で、従来のすかしは、抄紙機のワイヤ上のダンディロールによって、所定の模様で湿紙に凹凸が形成され施されていた。また、円網抄紙機では、所定の模様をしたすき入れの型を有する円網によって施されていた。前述の抄紙機上で施されるすかしは、凹凸が形成されることによって、紙厚の厚い箇所と薄い箇所で濃淡が生じ、模様が認識されるものである。   In order to prevent counterfeiting, bill paper, passports, securities, valuable printed matter, and the like are manufactured with watermarked paper, paper with functional fibers, paper with threads, and the like. Among them, the conventional watermark has been formed by forming irregularities on the wet paper in a predetermined pattern by a dandy roll on the wire of the paper machine. Further, in a circular net paper machine, it is provided by a circular net having a squeeze mold having a predetermined pattern. The watermark applied on the paper machine described above is a pattern in which unevenness is formed, thereby producing shades at thick and thin portions of the paper, thereby recognizing the pattern.

しかしながら、前述の抄紙機上で施されるすかしは、用紙の凹凸による色の濃淡のみで視認されるもので、複数の色を用いてすかしを施すことができず、意匠性に欠けるものであった。   However, the watermark applied on the above-mentioned paper machine is visually recognized only by the shade of the color due to the unevenness of the paper, and the watermark cannot be applied using a plurality of colors and lacks in design. Met.

そこで、多色のすかしが視認できる用紙として、プラスチックフィルムに文字、模様又は図形を多色刷りで印刷し、前述したプラスチックフィルムの印刷された面に、透明又は半透明の薄紙を貼り合わせ、裏面に不透明紙を貼り合わせた偽造防止用紙が開示されている（例えば、特許文献１参照）。   Therefore, as a paper on which multicolored watermarks can be visually recognized, letters, patterns, or figures are printed on a plastic film with multicolor printing, and a transparent or translucent thin paper is pasted on the printed surface of the plastic film described above. An anti-counterfeit paper in which an opaque paper is bonded together is disclosed (for example, see Patent Document 1).

また、反射光では色のしるしの検出が不可能で、可視スペクトルの透過光で見るときには検出可能となる樹脂質支持体シートの一方の面に色のしるしの層を配置し、樹脂質支持体シートの色のしるしが配置された面と他方の面に、不透明度７５％〜８５％、重量１９〜５０ｇ／ｍ2、厚さ０．０３８〜０．０５０ｍｍの紙シートを接着剤で積層した防護紙が開示されている（特許文献２参照）。 In addition, a colored mark layer is arranged on one surface of the resinous support sheet, which cannot be detected with reflected light, and can be detected when viewed with transmitted light in the visible spectrum. A sheet of paper having an opacity of 75% to 85%, a weight of 19 to 50 g / m 2 , and a thickness of 0.038 to 0.050 mm was laminated with an adhesive on the surface on which the color mark of the sheet was placed and the other surface. A protective paper is disclosed (see Patent Document 2).

実公昭Ｓ４９−１４９６５号公報（第１−２項、第１、２図）Japanese Utility Model Publication S49-14965 (Section 1-2, Figures 1 and 2) 特許第３１６４８２３号公報（第１−１５項、第１−４図）Japanese Patent No. 3164823 (1-15, Fig. 1-4)

しかしながら、特許文献１の偽造防止用紙は、単にプラスチックフィルムの印刷された面に透明又は半透明の薄紙を貼り合せているため、本来、透かしたときに視認されるべき模様等が、蛍光灯などの照明の光が当たると、反射光としてプラスチックフィルムに印刷された模様等の色が、透明又は半透明の薄紙を超えて視認されてしまうものであった。さらに、このように構成が単純であるため、複製が容易であるという問題があった。   However, since the anti-counterfeit paper of Patent Document 1 simply has a transparent or translucent thin paper pasted on the printed surface of a plastic film, a pattern or the like that should be visually recognized when watermarked is originally a fluorescent lamp or the like. When the illumination light is applied, the color of the pattern or the like printed on the plastic film as reflected light is visible beyond the transparent or translucent thin paper. Further, since the configuration is simple as described above, there is a problem that replication is easy.

また、特許文献２の防護紙は、樹脂質支持体シートに配置された色のしるしが反射光で検出されないように、１層当たりの紙シートの不透明度を７５％〜８５％と高くするため、透過光での視認性が悪いという問題があった。   Further, the protective paper of Patent Document 2 is for increasing the opacity of the paper sheet per layer to 75% to 85% so that the color mark arranged on the resinous support sheet is not detected by reflected light. There was a problem that visibility with transmitted light was poor.

また、特許文献２の防護紙は、重量１９〜５０ｇ／ｍ2、厚さ０．０３８〜０．０５０ｍｍに、紙シートの形態を限定する必要があり、特に前述した紙シートの形態の下限側（重量１９ｇ／ｍ2、厚さ ０．０３８ｍｍ）で、７５％の不透明度を得るための顔料を添加する方法では、紙シートの色が限定されてしまう結果となる。また、二酸化チタンのような充填剤を添加する方法においても、多量の充填剤を添加する必要があるという問題があった。 Further, the protective paper of Patent Document 2 needs to limit the form of the paper sheet to a weight of 19 to 50 g / m 2 and a thickness of 0.038 to 0.050 mm, and in particular, the lower limit side of the form of the paper sheet described above. The method of adding a pigment for obtaining an opacity of 75% at a weight of 19 g / m 2 and a thickness of 0.038 mm results in the color of the paper sheet being limited. Further, the method of adding a filler such as titanium dioxide has a problem that a large amount of filler needs to be added.

そこで、本発明は、特許文献２の防護紙を作製する条件である、不透明度、重量及び厚さに限定される範囲よりも広範囲で製造可能であるとともに、紙シートの形態が同じであれば、前述の防護紙のしるしよりも透過光での視認性が良好で、反射光では視認できず、透過光では視認できる偽造防止用紙を提供することを目的とする。   Therefore, the present invention can be manufactured in a wider range than the range limited to opacity, weight and thickness, which are the conditions for producing the protective paper of Patent Document 2, and the form of the paper sheet is the same. It is an object of the present invention to provide a forgery prevention paper that has better visibility with transmitted light than the above-mentioned protective paper indicia, is not visible with reflected light, and is visible with transmitted light.

本発明は、上部紙層と下部紙層と少なくとも１層から成る中間層から構成される多層紙において、中間層は、一方の面に、補色又はほぼ補色関係にあるパール顔料と着色顔料を有するインキにより図柄が形成された少なくとも１層から成り、上部紙層及び下部紙層は不透明度が４０〜９０％の範囲であることを特徴とする多層紙である。   The present invention relates to a multilayer paper composed of an intermediate layer composed of an upper paper layer, a lower paper layer, and at least one layer, and the intermediate layer has a pearl pigment and a color pigment that are complementary or nearly complementary in color on one side. It consists of at least one layer in which a pattern is formed with ink, and the upper paper layer and the lower paper layer are multilayer papers characterized in that the opacity is in the range of 40 to 90%.

本発明は、上部紙層と下部紙層から成る多層紙において、上部紙層と下部紙層が接する面の一方の紙層面に、補色又はほぼ補色関係にあるパール顔料と着色顔料を有するインキにより図柄が形成され、上部紙層及び下部紙層は不透明度が４０〜９０％の範囲であることを特徴とする多層紙である。   The present invention relates to a multi-layer paper composed of an upper paper layer and a lower paper layer, and an ink having a pearl pigment and a coloring pigment having a complementary color or a substantially complementary color relationship on one paper layer surface of the surface contacting the upper paper layer and the lower paper layer. A pattern is formed, and the upper paper layer and the lower paper layer are multilayer papers characterized in that the opacity is in the range of 40 to 90%.


また、本発明の多層紙は、中間層が不織布であることを特徴とする。
The multilayer paper of the present invention is characterized in that the intermediate layer is a nonwoven fabric.

また、本発明の多層紙は、図柄を形成したインキに含まれるパール顔料と着色顔料が、補色の関係であることを特徴とする。   Further, the multilayer paper of the present invention is characterized in that the pearl pigment and the color pigment contained in the ink having a pattern are in a complementary color relationship.

また、本発明の多層紙は、図柄を形成したインキに含まれるパール顔料が、リーフィング処理が施されていることを特徴とする。   In addition, the multilayer paper of the present invention is characterized in that the pearl pigment contained in the ink forming the pattern is subjected to a leafing treatment.

また、本発明の多層紙は、上部紙層及び下部紙層が、各々坪量２０〜５０ｇ／ｍ2、厚さ０．０３５〜０．０５０ｍｍの範囲であることを特徴とする。 The multilayer paper of the present invention is characterized in that the upper paper layer and the lower paper layer have a basis weight of 20 to 50 g / m 2 and a thickness of 0.035 to 0.050 mm, respectively.

本発明の多層紙は、特許文献２の防護紙よりも、坪量や不透明度等の数値的制約が少なく、かつ、潜像効果の高い多層紙を製造することができる。また、本発明の多層紙は、特許文献２の防護紙のしるしよりも視認性に優れ、反射光では視認できず、透過光では視認できる、カラーのすき入れを視認することができる。   The multilayer paper of the present invention has fewer numerical restrictions such as basis weight and opacity than the protective paper of Patent Document 2, and can produce a multilayer paper with a high latent image effect. In addition, the multilayer paper of the present invention is more visible than the protective paper in Japanese Patent Application Laid-Open No. 2005-228561, and can visually recognize color penetration that is not visible with reflected light but visible with transmitted light.

本発明を実施するための最良の形態について図面を用いて説明する。しかしながら、本発明は、以下に述べる実施するための最良の形態に限定されるものではなく、特許請求の範囲記載における技術的思想の範囲内であれば、その他いろいろな実施の形態が含まれる。なお、以降の説明の中で「不織布に着色顔料又は着色顔料とパール顔料を含むインキで印刷されていない領域」を「多層紙の無地部」と呼ぶこととする。   The best mode for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the best mode for carrying out the invention described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims. In the following description, the “region not printed with an ink containing a colored pigment or a colored pigment and a pearl pigment on the nonwoven fabric” will be referred to as “a plain portion of the multilayer paper”.

本発明の多層紙の実施形態について図１から図６までを用いて説明する。なお、本実施の形態では、中間層に不織布を１層使用した多層紙について説明する。さらに、本実施の形態では、不織布の一方の面に、リーフィング処理を施したパール顔料と着色顔料を含むインキで印刷層を形成した多層紙について説明する。   An embodiment of a multilayer paper according to the present invention will be described with reference to FIGS. In the present embodiment, a multilayer paper using one layer of nonwoven fabric as an intermediate layer will be described. Furthermore, in this embodiment, a multilayer paper in which a printed layer is formed on one surface of a nonwoven fabric with an ink containing a pearl pigment and a color pigment subjected to a leafing treatment will be described.

図１（ａ）は、本発明の多層紙１の断面図であり、上部紙層２と下部紙層３の間に不織布４が設けられている。不織布４の一方の面には、着色顔料６とパール顔料７を含むインキによって印刷層５が形成されている。図１（ｂ）は、不織布４に印刷されている図柄８を示す図である。図２は、本発明の多層紙１にＲＧＢ成分を含む光が入射したときの反射光及び透過光を示す図である。図３（ａ）は、本発明の多層紙１を反射光で観察したときの状態を示す図である。図３（ｂ）は、本発明の多層紙１を透過光で観察したときの状態を示す図である。   FIG. 1A is a cross-sectional view of a multilayer paper 1 according to the present invention, in which a nonwoven fabric 4 is provided between an upper paper layer 2 and a lower paper layer 3. A printed layer 5 is formed on one surface of the nonwoven fabric 4 with an ink containing a color pigment 6 and a pearl pigment 7. FIG. 1 (b) is a diagram showing a pattern 8 printed on the nonwoven fabric 4. FIG. 2 is a diagram showing reflected light and transmitted light when light including RGB components is incident on the multilayer paper 1 of the present invention. FIG. 3A is a diagram showing a state when the multilayer paper 1 of the present invention is observed with reflected light. FIG. 3B is a diagram showing a state when the multilayer paper 1 of the present invention is observed with transmitted light.

図４（ａ）、（ｂ）及び図５（ａ）、（ｂ）は、本発明の多層紙１の反射光及び透過光における視認性を評価するために作製した多層紙１ａ〜１ｅ（図示せず）と、本実施の形態の多層紙１の色相ａ*ｂ*を示す図である。詳細には、図４（ａ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を１０％に固定し、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域を、上部紙層２側からそれぞれ測定したときの色相ａ*を示す図である。図４（ｂ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を１０％に固定し、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域を、上部紙層２側からそれぞれ測定したときの色相ｂ*を示す図である。   4 (a), 4 (b), 5 (a), and 5 (b) are multilayer papers 1a to 1e prepared for evaluating the visibility of reflected light and transmitted light of the multilayer paper 1 of the present invention (FIG. And a hue a * b * of the multilayer paper 1 of the present embodiment. Specifically, FIG. 4A shows a plain portion of the multilayer paper 1, a region printed with ink blended with the nonwoven fabric 4 without changing the ratio of the color pigment 6 and the medium without using the pearl pigment 7, and the nonwoven fabric 4. FIG. 6 is a diagram showing hue a * when the area where the pearl pigment 7 is fixed at 10% and the area where the ink blended by changing the ratio of the color pigment 6 and the medium is printed is measured from the upper paper layer 2 side. . FIG. 4B shows a plain portion of the multilayer paper 1, a region in which the pearl pigment 7 is not used in the non-woven fabric 4, a region printed with ink mixed by changing the ratio of the color pigment 6 and medium, and a pearl pigment on the non-woven fabric 4. 7 is a diagram showing hue b * when an area printed with ink in which 7 is fixed at 10% and the ratio of the coloring pigment 6 and the medium is changed is printed from the upper paper layer 2 side.

図５（ａ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を３０％に固定し、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域を、上部紙層２側からそれぞれ測定したときの色相ａ*を示す図である。図５（ｂ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を３０％に固定し、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域を、上部紙層２側からそれぞれ測定したときの色相ｂ*を示す図である。   FIG. 5 (a) shows a plain portion of the multilayer paper 1, a non-woven fabric 4 without using a pearl pigment 7, a region printed with ink mixed with a ratio of the colored pigment 6 and medium, and a non-woven fabric 4 with a pearl pigment. 7 is a diagram showing hue a * when an area printed with ink in which 7 is fixed to 30% and the ratio of coloring pigment 6 and medium is changed is printed from the upper paper layer 2 side. FIG. 5 (b) shows a plain portion of the multilayer paper 1, a region where ink is blended by changing the ratio of the color pigment 6 and medium without using the pearl pigment 7 in the nonwoven fabric 4, and a pearl pigment on the nonwoven fabric 4. 7 is a diagram showing hue b * when an area printed with ink in which 7 is fixed to 30% and the ratio of coloring pigment 6 and medium is mixed is printed from the upper paper layer 2 side.

図６（ａ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を１０％に固定し、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域において、上部紙層２側に光源を配置し、下部紙層３側に受光部を配置して測定した分光透過率を示す図である。図６（ｂ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を３０％に固定し、着色顔料６とメジウムの割合を変更させて配合したインキを印刷した領域において、上部紙層２側に光源を配置し、下部紙層３側に受光部を配置して測定した分光透過率を示す図である。   FIG. 6A shows a plain portion of the multilayer paper 1, a region printed with ink mixed by changing the ratio of the color pigment 6 and medium without using the pearl pigment 7 in the nonwoven fabric 4, and the pearl pigment on the nonwoven fabric 4. 7 is fixed at 10%, and in the region where the ink blended by changing the ratio between the color pigment 6 and the medium is printed, a light source is arranged on the upper paper layer 2 side and a light receiving part is arranged on the lower paper layer 3 side. It is a figure which shows the spectral transmittance measured in this way. FIG. 6B shows a plain portion of the multilayer paper 1, a region in which the pearl pigment 7 is not used in the nonwoven fabric 4, a region printed with ink mixed with the ratio of the color pigment 6 and medium changed, and a pearl pigment on the nonwoven fabric 4. 7 is fixed at 30%, and in the area where the ink blended by changing the ratio between the color pigment 6 and the medium is printed, a light source is arranged on the upper paper layer 2 side and a light receiving part is arranged on the lower paper layer 3 side. It is a figure which shows the spectral transmittance measured in this way.

図１（ａ）の多層紙１は、不織布４の一方の面に、着色顔料６をグリーンインキ（大日精化工業製 ダイピロキサイドカラーグリーン ＃９３２０）で０．２５％、リーフィング処理を施したマゼンタ色の粉末パール顔料７（メルク製 ＮＥＷ２１１）を１０％、メジウム（帝国インキ製 ＵＶ ＴＵＢ０００メジウム）を８９．７５％の割合で配合したインキで印刷している。ここで、リーフィング処理とは、パーフルオロアルキルリン酸塩処理であり、パール顔料７に撥水性及び撥油性を付与する表面処理のことである。このリーフィング処理によってパール顔料７がメジウム表面に配向する。なお、以降の説明において、インキの配合割合は、着色顔料６とパール顔料７のみを記載することとする。着色顔料６とパール顔料７の配合割合を除いたものがメジウムの配合割合である。   In the multilayer paper 1 of FIG. 1 (a), one side of a nonwoven fabric 4 was subjected to a leafing treatment with 0.25% of the color pigment 6 using green ink (Daipyrokusai Kogyo Color Green # 9320 manufactured by Dainichi Seika Kogyo). It is printed with ink containing 10% magenta powdered pearl pigment 7 (Merck NEW211) and 89.75% medium (Teikoku UV TUB000 medium). Here, the leafing treatment is a perfluoroalkyl phosphate treatment, which is a surface treatment for imparting water repellency and oil repellency to the pearl pigment 7. By this leafing treatment, the pearl pigment 7 is oriented on the surface of the medium. In the following description, only the color pigment 6 and the pearl pigment 7 are described as the ink mixture ratio. The medium ratio is obtained by excluding the ratio of the color pigment 6 and the pearl pigment 7.

図１（ａ）の印刷層５は、文字、数字、記号、図柄又は模様等を施すことができるが、本実施の形態では、不織布４に図１（ｂ）に示す図柄８を印刷した。   The printed layer 5 in FIG. 1A can be provided with letters, numbers, symbols, designs, patterns, or the like. In the present embodiment, the design 8 shown in FIG.

上部紙層２及び下部紙層３は、パルプ紙料をシートマシンで作製した。シートマシンで作製した上部紙層２及び下部紙層３は、湿紙の状態であり、作製した下部紙層３の上に図柄８を印刷した不織布４を積層し、更にその上に上部紙層２を積層し、プレス及び乾燥して多層紙1を作製した。作製した多層紙１の上部紙層２及び下部紙層３は、１層当たり、坪量３５ｇ／ｍ2、厚さ０．０５０ｍｍとし、上部紙層２及び下部紙層３の１層当たりの不透明度は６６％、多層紙１の全体の不透明度は９０％、色相が受光角０度のときL*８３．４９、a*１．７２、b*１２．５４であった。前述の色相の値から、本実施の形態の多層紙１は黄色が強い黄赤の色を示すものであるが、これに限定されるものではない。ただし、透過光における図柄８の視認性の点から、紙層の色と着色顔料の色を異ならせて組み合わせることが好ましい。なお、不透明度については、高速分光光度計（村上色彩技術研究所製 ＣＭＳ−３５ＳＰＸ）を用いて測定した。また、用紙の色相は、変角分光測色システム（村上色彩技術研究所製 変角分光測色システム ＧＣＭＳ４型）を用いて測定した。 For the upper paper layer 2 and the lower paper layer 3, pulp paper stock was produced by a sheet machine. The upper paper layer 2 and the lower paper layer 3 produced by the sheet machine are in the state of wet paper, and a non-woven fabric 4 printed with a pattern 8 is laminated on the produced lower paper layer 3, and the upper paper layer is further formed thereon. 2 were laminated, pressed and dried to produce multilayer paper 1. The upper paper layer 2 and the lower paper layer 3 of the produced multilayer paper 1 have a basis weight of 35 g / m 2 and a thickness of 0.050 mm per layer. The transparency was 66%, the overall opacity of the multilayer paper 1 was 90%, and L * 83.49, a * 1.72 and b * 12.54 when the hue was 0 °. From the hue value described above, the multilayer paper 1 of the present embodiment exhibits a yellow-red color with a strong yellow color, but is not limited to this. However, from the viewpoint of the visibility of the pattern 8 in transmitted light, it is preferable to combine the color of the paper layer and the color of the color pigment differently. The opacity was measured using a high-speed spectrophotometer (CMS-35SPX manufactured by Murakami Color Research Laboratory). The hue of the paper was measured using a variable angle spectral colorimetry system (Murakami Color Research Laboratory variable angle spectral colorimetry system GCMS type 4).

中間層は、不織布、ＰＥＴ基材、フィルム基材、カード基材及び前述した上部紙層２又は下部紙層３で例示した紙材等のシート基材でも本発明の多層紙１が作製可能である。好適には不織布が好ましく、不織布の例としては、ポリビニルアルコール繊維及びレーヨン繊維等があるが、特に限定されるものではない。ただし、多層紙１の層間剥離を考慮すると、ＰＶＡ繊維の不織布又はバインダーを塗布した不織布を用いることが好ましい。なお、本実施の形態の不織布４には、坪量１２ｇ／ｍ2、厚さ０．０３５ｍｍのポリビニルアルコール製でバインダーを塗布したものを用いた。 As the intermediate layer, the multilayer paper 1 of the present invention can be produced even by a sheet base material such as a nonwoven fabric, a PET base material, a film base material, a card base material and the paper material exemplified in the upper paper layer 2 or the lower paper layer 3 described above. is there. Nonwoven fabrics are preferably used, and examples of the nonwoven fabric include polyvinyl alcohol fibers and rayon fibers, but are not particularly limited. However, considering the delamination of the multilayer paper 1, it is preferable to use a PVA fiber nonwoven fabric or a nonwoven fabric coated with a binder. In addition, the nonwoven fabric 4 of this Embodiment used what made the polyvinyl alcohol with a basic weight of 12 g / m < 2 >, thickness 0.035mm, and apply | coated the binder.

上部紙層２及び下部紙層３に使用するパルプは、特に限定されるものではなく、例えば、木材や木綿等の植物繊維を原料とするＫＰ法やＳＰ法によって得られる化学パルプ、ＧＰ、ＴＭＰ、ＣＴＭＰ、ＣＧＰ又はＳＣＰ等の機械パルプ、漂白パルプ、古紙再生パルプ等のいずれかのパルプを適宜選択することができる。   The pulp used for the upper paper layer 2 and the lower paper layer 3 is not particularly limited. For example, chemical pulp, GP, TMP obtained by the KP method or SP method using plant fibers such as wood and cotton as raw materials. Any pulp such as mechanical pulp such as CTMP, CGP or SCP, bleached pulp, recycled paper recycled pulp, etc. can be selected as appropriate.

本発明において、着色顔料６とパール顔料７の色の関係は、反射光で補色関係又はほぼ補色関係である。この補色関係とは、混色によりほぼ無彩色を表現可能な関係にある２色を、互いに補色としている。例えば、本実施の形態に限定されず、パール顔料がＣ（シアン）に対して着色顔料がＲ（レッド）及びパール顔料Ｙ（イエロー）に対して着色顔料がＢ（ブルー）であっても、実施可能である。また、ほぼ補色関係とは、例えば、ある有彩色の色相角と、もう一つの有彩色の色相角の差がＬ*ａ*ｂ*表色系で１６５°乃至１９５°の間にあるものであり、このような場合でも本発明の多層紙１が作製可能である。   In the present invention, the color relationship between the color pigment 6 and the pearl pigment 7 is a complementary color relationship or a substantially complementary color relationship with reflected light. In this complementary color relationship, two colors that have a relationship capable of expressing an almost achromatic color by mixing colors are complementary colors. For example, the present invention is not limited to this embodiment, even if the pearl pigment is C (cyan), the color pigment is R (red), and the pearl pigment Y (yellow) is B (blue). It can be implemented. The almost complementary color relationship is, for example, that the difference between the hue angle of one chromatic color and the hue angle of another chromatic color is between 165 ° and 195 ° in the L * a * b * color system. In such a case, the multilayer paper 1 of the present invention can be produced.

本実施の形態では、シートマシンで上部紙層２と下部紙層３を湿紙の状態で作製し、作製した下部紙層３の上に図柄８を印刷した不織布４を積層し、更にその上に上部紙層２を積層し、プレス及び乾燥して多層紙１を作製しているが、例えば、円網抄紙機及び長網抄紙機上で中間層として不織布を抄き込んで多層紙を作製するか、又はあらかじめ作製された用紙を上部紙層と下部紙層として用い、中間層として、本発明の実施の形態の図柄が形成された不織布を積層し、接着、加熱及び加圧等の処理をして貼り合わせても作製可能である。また、中間層を含まない上部紙層と下部紙層から成る多層紙において、上部紙層と下部紙層が接する面の少なくとも一方の紙層の面に、少なくともパール顔料と着色顔料を含むインキによって図柄を形成した場合においても、反射光では図柄が視認できず、透過光で図柄が視認できる多層紙が作製可能である。   In the present embodiment, the upper paper layer 2 and the lower paper layer 3 are produced in a wet paper state by a sheet machine, and the nonwoven fabric 4 on which the pattern 8 is printed is laminated on the produced lower paper layer 3, and further on The upper paper layer 2 is laminated on the substrate, pressed and dried to produce the multilayer paper 1. For example, a multilayer paper is produced by making a nonwoven fabric as an intermediate layer on a circular net paper machine and a long net paper machine. Or using pre-made paper as the upper paper layer and lower paper layer, and laminating the non-woven fabric on which the pattern of the embodiment of the present invention is formed as an intermediate layer, and processing such as adhesion, heating and pressurization It is also possible to make it by attaching them together. In addition, in a multilayer paper composed of an upper paper layer and a lower paper layer that does not include an intermediate layer, at least one paper layer that is in contact with the upper paper layer and the lower paper layer is coated with an ink containing at least a pearl pigment and a color pigment. Even when a pattern is formed, a multilayer paper in which the pattern cannot be visually recognized with reflected light and the pattern can be visually recognized with transmitted light can be produced.

本発明に用いる着色顔料６は、特に限定されるものではない。   The color pigment 6 used in the present invention is not particularly limited.

また、本発明に用いるパール顔料７は、虹彩色パール又は２色性パール等、特に限定されるものではない。   Further, the pearl pigment 7 used in the present invention is not particularly limited, such as iris pearl or dichroic pearl.

また、本発明に用いるメジウムは、特に限定されるものではない。   The medium used in the present invention is not particularly limited.

次に、このように作製された多層紙１に、白色光のようなＲＧＢ成分を含む光が照射されたときの反射光及び透過光で認識される印刷層５で形成された図柄８の原理について、図２〜図５を用いて説明する。   Next, the principle of the pattern 8 formed by the printed layer 5 recognized by reflected light and transmitted light when the multilayer paper 1 manufactured in this way is irradiated with light including RGB components such as white light. Will be described with reference to FIGS.

図２は、本発明の多層紙１に、ＲＧＢ成分を含む光が入射したときの反射光及び透過光を示す図である。また、図３（ａ）は、本発明の多層紙１を反射光で観察したときの状態を示す図である。また、図３（ｂ）は、本発明の多層紙１を透過光で観察したときの状態を示す図である。   FIG. 2 is a diagram showing reflected light and transmitted light when light including RGB components is incident on the multilayer paper 1 of the present invention. Moreover, Fig.3 (a) is a figure which shows a state when the multilayer paper 1 of this invention is observed with reflected light. FIG. 3B is a diagram showing a state when the multilayer paper 1 of the present invention is observed with transmitted light.

本発明の多層紙１に、ＲＧＢ成分を含む光が入射すると、図２に示すようにＲＧＢ成分を含む光は、上部紙層２を透過する。そして、ＲＧＢ成分を含む光がマゼンタ色のパール顔料７に照射されると、ＲＢ成分の大部分は反射され、残りのＲＢ成分及びＧ成分は透過する。また、パール顔料７を透過したＧ成分は、着色顔料６に照射されて反射及び透過し、パール顔料７を透過したＲＢ成分は、着色顔料６に照射され、着色顔料６に吸収される。そして、印刷層５からの反射光は、パール顔料７が反射するＲＢ成分と着色顔料６が反射するＧ成分となり、これらのＲＧＢ成分の光は、上部紙層２内で散乱されて、最終的に観察者の目に到達する印刷層５の色は、無彩色又はほぼ無彩色の状態となる。したがって、多層紙１の不織布４に印刷された領域を上部紙層２側から観察した場合、上部紙層２の色が観察され、図３（ａ）に示すように図柄８は視認できない。   When light containing RGB components enters the multilayer paper 1 of the present invention, the light containing RGB components passes through the upper paper layer 2 as shown in FIG. When light containing RGB components is applied to the magenta pearl pigment 7, most of the RB components are reflected and the remaining RB and G components are transmitted. The G component that has passed through the pearl pigment 7 is irradiated to the colored pigment 6 to be reflected and transmitted, and the RB component that has passed through the pearl pigment 7 is irradiated to the colored pigment 6 and absorbed by the colored pigment 6. Then, the reflected light from the printing layer 5 becomes an RB component reflected by the pearl pigment 7 and a G component reflected by the coloring pigment 6, and the light of these RGB components is scattered in the upper paper layer 2 to be finally obtained. The color of the printed layer 5 that reaches the eyes of the observer is achromatic or almost achromatic. Therefore, when the region printed on the nonwoven fabric 4 of the multilayer paper 1 is observed from the upper paper layer 2 side, the color of the upper paper layer 2 is observed, and the design 8 cannot be visually recognized as shown in FIG.

本発明では、パール顔料７にリーフィング処理を施しているため、パール顔料７がメジウム表面に配向し、リーフィング処理を施していない印刷層と比べて、高い反射光を得ることができる。これは、メジウム表面に配向することによって反射光及び透過光の直進性が増すからである。結果として、白色光のようなＲＧＢ成分を含む光がパール顔料７に照射される場合、パール顔料７が反射するＲＢ成分が増加するとともに、パール顔料７を透過するＧ成分も増加する結果となる。   In the present invention, since the pearl pigment 7 is subjected to the leafing treatment, the pearl pigment 7 is oriented on the surface of the medium, and a high reflected light can be obtained as compared with the printed layer not subjected to the leafing treatment. This is because the straightness of reflected light and transmitted light is increased by being oriented on the surface of the medium. As a result, when the pearl pigment 7 is irradiated with light including RGB components such as white light, the RB component reflected by the pearl pigment 7 increases and the G component transmitted through the pearl pigment 7 also increases. .

反射光及び透過光で観察したときの図柄８の視認性について評価するため、図１（ａ）及び図１（ｂ）に示す多層紙１において、図柄８を形成する印刷層５を、パール顔料７を用いず着色顔料６を０．２５％含むインキで印刷した多層紙１ａ（図示せず）と、図柄８を形成する印刷層５を、パール顔料７を用いず着色顔料６を０．５％含むインキで印刷した多層紙１ｂ（図示せず）と、図柄８を形成する印刷層５を、着色顔料０．５％、パール顔料１０％を含むインキで印刷した多層紙１ｃ（図示せず）と、図柄８を形成する印刷層５を、着色顔料を０．２５％、パール顔料３０％を含むインキで印刷した多層紙１ｄ（図示せず）と、図柄８を形成する印刷層５を、着色顔料０．５％、パール顔料３０％を含むインキで印刷した多層紙１ｅ（図示せず）を作製した。なお、多層紙１ａ〜１ｅの上部紙層２と下部紙層３の形態は、前述した多層紙１と同様の紙層とし、着色顔料６、パール顔料７及び不織布４も前述した多層紙１と同様のものを用いた。   In order to evaluate the visibility of the pattern 8 when observed with reflected light and transmitted light, in the multilayer paper 1 shown in FIGS. 1 (a) and 1 (b), the printed layer 5 forming the pattern 8 is used as a pearl pigment. The multilayer paper 1a (not shown) printed with an ink containing 0.25% of the color pigment 6 without using the color pigment 7 and the print layer 5 forming the pattern 8 are mixed with 0.5 color pigment 6 without using the pearl pigment 7. A multilayer paper 1b (not shown) printed with an ink containing 1% (not shown) and a multilayer paper 1c (not shown) printed with an ink containing 0.5% colored pigment and 10% pearl pigment on a printing layer 5 forming a pattern 8 ), A multilayer paper 1d (not shown) printed with an ink containing 0.25% of a color pigment and 30% of a pearl pigment, and a printed layer 5 that forms the pattern 8 , Multilayer paper 1e printed with ink containing 0.5% colored pigment and 30% pearl pigment ( To prepare a Shimese not). The forms of the upper paper layer 2 and the lower paper layer 3 of the multilayer papers 1a to 1e are the same paper layers as the multilayer paper 1 described above, and the colored pigment 6, the pearl pigment 7 and the nonwoven fabric 4 are also the same as the multilayer paper 1 described above. Similar ones were used.

そして、多層紙１の無地部、多層紙１及び多層紙１ａ〜１ｅの不織布４に印刷された領域の色相を上部紙層２側から、変角分光測色システム（村上色彩技術研究所製 変角分光測色システム ＧＣＭＳ４型）を用いて測定した。また、多層紙１の無地部、多層紙１及び多層紙１ａ〜１ｅの不織布４に印刷された領域の透過率を自己分光光度計（Ｕ−３５００／Ｕ−４０００型 日立計測器サービス株式会社製）を用いて測定した。なお、透過率の測定は、上部紙層２側に光源を配置し、下部紙層３側に受光部を配置して測定を行った。   Then, the hue of the area printed on the plain portion of the multilayer paper 1, the multilayer paper 1 and the nonwoven fabric 4 of the multilayer paper 1a to 1e is changed from the upper paper layer 2 side to the variable angle spectrocolorimetry system (Murakami Color Research Laboratory). Measurement was performed using an angular spectrocolorimetry system GCMS4 type). Moreover, the transmittance | permeability of the area | region printed on the plain part of the multilayer paper 1, the multilayer paper 1, and the nonwoven fabric 4 of multilayer paper 1a-1e is made into the self-spectrophotometer (U-3500 / U-4000 type Hitachi Instruments Service Co., Ltd. product). ). The transmittance was measured by arranging a light source on the upper paper layer 2 side and a light receiving part on the lower paper layer 3 side.

（反射光での視認性の評価）
図４（ａ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６の割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を１０％に固定し、着色顔料６の割合を変更させて配合したインキを印刷した領域を、上部紙層２側からそれぞれ測定したときの色相ａ*を示す図である。 (Evaluation of visibility with reflected light)
FIG. 4A shows a plain portion of the multilayer paper 1, a region in which the pearl pigment 7 is not used in the nonwoven fabric 4, a region in which the ink blended by changing the ratio of the colored pigment 6 is printed, and the pearl pigment 7 in the nonwoven fabric 4. It is a figure which shows hue a * when measuring the area | region which printed the ink mixed by changing the ratio of the color pigment 6 fixed to 10% from the upper paper layer 2 side, respectively.

図４（ｂ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６の割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を１０％に固定し、着色顔料６の割合を変更させて配合したインキを印刷した領域を、上部紙層２側からそれぞれ測定したときの色相ｂ*を示す図である。   FIG. 4B shows a plain portion of the multilayer paper 1, a region in which the pearl pigment 7 is not used in the nonwoven fabric 4, a region in which the ink blended by changing the ratio of the colored pigment 6 is printed, and the pearl pigment 7 in the nonwoven fabric 4. It is a figure which shows hue b * when the area | region which printed the ink mixed by changing the ratio of the color pigment 6 fixed to 10% was measured from the upper paper layer 2 side, respectively.

図５（ａ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６の割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を３０％に固定し、着色顔料６の割合を変更させて配合したインキを印刷した領域を、上部紙層２側からそれぞれ測定したときの色相ａ*を示す図である。   FIG. 5 (a) shows a plain portion of the multilayer paper 1, a non-woven fabric 4 without using the pearl pigment 7, a region printed with ink mixed with the ratio of the colored pigment 6 changed, and the non-woven fabric 4 with the pearl pigment 7. It is a figure which shows hue a * when measuring the area | region which printed the ink mixed by changing the ratio of the color pigment 6 fixed to 30% from the upper paper layer 2 side, respectively.

図５（ｂ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６の割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を３０％に固定し、着色顔料６の割合を変更させて配合したインキを印刷した領域を、上部紙層２側からそれぞれ測定したときの色相ｂ*を示す図である。   FIG. 5 (b) shows a plain portion of the multilayer paper 1, a non-woven fabric 4 without using the pearl pigment 7, a region printed with ink mixed by changing the ratio of the colored pigment 6, and the non-woven fabric 4 with the pearl pigment 7. It is a figure which shows hue b * when the area | region which printed the ink mixed by changing the ratio of the color pigment 6 fixed to 30% was measured from the upper paper layer 2 side, respectively.

なお、Ｌ*ａ*ｂ*表色系において、色相ａ*は赤色成分の色の強さを示すものであり、色相ａ*の値がマイナスの値であると緑色成分の強さを示す。また、色相ｂ*は黄色成分の色の強さを示すものであり、色相ｂ*の値がマイナスの値であると青色成分の強さを示すものである。   In the L * a * b * color system, the hue a * indicates the color intensity of the red component, and if the value of the hue a * is a negative value, it indicates the intensity of the green component. The hue b * indicates the strength of the yellow component. If the hue b * is a negative value, the hue b * indicates the intensity of the blue component.

本実施の形態において、多層紙１の無地部の色相は、図４（ａ）及び図４（ｂ）に示すように、色相ａ*及び色相ｂ*がプラスで、特に色相ｂ*の値が大きいことから、黄色が強い黄赤色である。多層紙１の無地部、不織布４にパール顔料７を用いず、着色顔料６の割合を変更させて配合したインキを印刷した領域及び不織布４に着色顔料６とパール顔料７を含むインキで印刷した領域の色相ｂ*は、図４（ｂ）及び図５（ｂ）に示すように、いずれも同程度であった。したがって、反射光での図柄８の視認性は、色相ａ*の影響が大きいこととなる。
以下にその説明をする。 In the present embodiment, as shown in FIGS. 4 (a) and 4 (b), the hue of the plain portion of the multilayer paper 1 is positive in hue a * and hue b *. Since it is large, yellow is a strong yellow-red color. The plain paper of the multilayer paper 1 and the non-woven fabric 4 were not used with the pearl pigment 7 but were printed with the ink containing the colored pigment 6 and the pearl pigment 7 printed on the non-woven fabric 4 and the non-woven fabric 4 printed with the blended ink. The hue b * of the region was almost the same as shown in FIGS. 4B and 5B. Therefore, the visibility of the pattern 8 with reflected light is greatly influenced by the hue a *.
This will be described below.

図４（ａ）に示す測定結果から、測定角度０度において、多層紙１の無地部の色相ａ*に対して、不織布４にパール顔料７を用いず、着色顔料６の割合を変更させて配合したインキを印刷した領域の色相ａ*の値は、１．７程度低い値となっており、実際に、不織布４にパール顔料７を用いず、着色顔料６の割合を変更させて配合したインキで印刷した領域を、目視の反射光で観察すると、着色顔料６のグリーン色が確認された。   From the measurement result shown in FIG. 4 (a), the ratio of the colored pigment 6 is changed without using the pearl pigment 7 in the nonwoven fabric 4 with respect to the hue a * of the plain portion of the multilayer paper 1 at a measurement angle of 0 degree. The value of hue a * in the area where the blended ink is printed is a value lower by about 1.7. Actually, the pearl pigment 7 is not used in the nonwoven fabric 4, and the ratio of the color pigment 6 is changed. When the area printed with the ink was observed with the reflected light by visual observation, the green color of the colored pigment 6 was confirmed.

一方、測定角度０度において、多層紙１の無地部の色相ａ*対して、不織布４に着色顔料６を０．５％、パール顔料７を１０％含むインキで印刷した領域の色相ａ*の値は、１．４程度低い値であり、実際に、不織布４に着色顔料６を０．５％、パール顔料７を１０％含むインキで印刷した領域を、目視の反射光で観察すると、前述の不織布４にパール顔料７を用いず、着色顔料６の割合を変更させて配合したインキを印刷した領域と比べ、グリーン色の視認性は弱くなるが、完全にグリーン色が視認されないという結果ではなかった。   On the other hand, at a measurement angle of 0 degree, the hue a * of the area printed with ink containing 0.5% of the colored pigment 6 and 10% of the pearl pigment 7 on the nonwoven fabric 4 with respect to the hue a * of the plain portion of the multilayer paper 1 The value is as low as about 1.4. Actually, when the region printed with the ink containing 0.5% of the colored pigment 6 and 10% of the pearl pigment 7 on the nonwoven fabric 4 is observed with the reflected light, the above-mentioned value is obtained. Compared with the region where the pearl pigment 7 is not used in the non-woven fabric 4 and the ink mixed with the ratio of the colored pigment 6 is changed, the green color is less visible, but the result is that the green color is not completely visible. There wasn't.

そして、測定角度０度において、多層紙１の無地部の色相ａ*に対して、不織布４に着色顔料６を０．２５％、パール顔料７を１０％含むインキで印刷した領域の色相ａ*の値は、０．５程度低く、無地部に近い値となり、実際に、不織布４に着色顔料６を０．２５％、パール顔料７を１０％含むインキで印刷した領域を目視の反射光で観察すると、多層紙１の無地部と同様な色で視認された。   Then, at a measurement angle of 0 degree, the hue a * of the area printed with the ink containing 0.25% of the colored pigment 6 and 10% of the pearl pigment 7 on the nonwoven fabric 4 with respect to the hue a * of the plain portion of the multilayer paper 1 Is about 0.5, which is close to the plain portion. Actually, the area printed with the ink containing 0.25% colored pigment 6 and 10% pearl pigment 7 on the nonwoven fabric 4 is visually reflected. When observed, it was visually recognized in the same color as the plain portion of the multilayer paper 1.

以上の結果から、着色顔料６と補色の関係にあるパール顔料７を所定の割合で配合することによって、反射光で着色顔料６の色が視認されなくなることが説明できる。ただし、図４（ａ）に示すように、着色顔料６を０．５％、パール顔料７を１０％で配合して印刷した場合、色相ａ*の差が大きく、目視で着色顔料６の色が視認されてしまうため、このような場合には、着色顔料６とパール顔料７の配合割合を調整すればよい。例えば、図５（ａ）に示すように、パール顔料６の配合割合を３０％にすることで、多層紙１の無地部に対する色相ａ*の値は、測定角度０度のときに０．９程度低い値となり、目視の反射光で観察した場合も多層紙１の無地部に近い色となる。   From the above results, it can be explained that the color of the colored pigment 6 is not visually recognized by the reflected light by blending the pearl pigment 7 complementary to the colored pigment 6 at a predetermined ratio. However, as shown in FIG. 4 (a), when the color pigment 6 is mixed at 0.5% and the pearl pigment 7 is mixed at 10% and printed, the difference in hue a * is large, and the color of the color pigment 6 is visually observed. In such a case, the blending ratio of the color pigment 6 and the pearl pigment 7 may be adjusted. For example, as shown in FIG. 5A, by setting the blending ratio of the pearl pigment 6 to 30%, the value of the hue a * for the plain portion of the multilayer paper 1 is 0.9 when the measurement angle is 0 degree. It becomes a low value to a certain extent, and even when observed with visually reflected light, the color is close to the plain portion of the multilayer paper 1.

（透過光での視認性の評価）
図６（ａ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６の割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を１０％に固定し、着色顔料６の割合を変更させて配合したインキを印刷した領域において、上部紙層２側に光源を配置し、下部紙層３側に受光部を配置して測定した分光透過率を示す図である。図６（ｂ）は、多層紙１の無地部と、不織布４にパール顔料７を用いず、着色顔料６の割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を３０％に固定し、着色顔料６の割合を変更させて配合したインキを印刷した領域において、上部紙層２側に光源を配置し、下部紙層３側に受光部を配置して測定した分光透過率を示す図である。 (Evaluation of visibility with transmitted light)
FIG. 6A shows a plain portion of the multilayer paper 1, an area printed with ink blended by changing the ratio of the colored pigment 6 without using the pearl pigment 7 on the nonwoven fabric 4, and the pearl pigment 7 on the nonwoven fabric 4. Spectral spectrum measured by placing a light source on the upper paper layer 2 side and a light receiving part on the lower paper layer 3 side in an area where the ink mixed with the ratio of the color pigment 6 changed and mixed is fixed at 10%. It is a figure which shows the transmittance | permeability. FIG. 6B shows a plain portion of the multilayer paper 1, a region in which the pearl pigment 7 is not used in the non-woven fabric 4, a region in which the ink blended by changing the ratio of the colored pigment 6 is printed, and the pearl pigment 7 in the non-woven fabric 4. Spectral spectrum measured by placing a light source on the upper paper layer 2 side and a light receiving part on the lower paper layer 3 side in an area where the ink mixed with the ratio of the colored pigment 6 changed and fixed at 30% is printed. It is a figure which shows the transmittance | permeability.

図６（ａ）から、多層紙１の無地部の分光透過率は、緑色から赤色にかけての光の透過成分が多く、実際に目視の透過光で観察すると、黄赤色で観察される。これに対して、多層紙１ａの不織布４にパール顔料７を用いず、着色顔料６を０．２５％含むインキで印刷した領域の分光透過率は、６００〜７００ｎｍの波長領域、すなわち、赤色成分にかけての光の透過率が１〜２％程度下がる。一方、５００〜５７０ｎｍの波長領域、すなわち、緑色成分の光の透過率は変わらない。結果的に、赤色成分の光の透過量が減るため多層紙１の無地部とコントラスト差が生じ、緑色の図柄８が観察される。ただし、多層紙１ａは着色顔料の配合量が０．２５％と低いため図柄８の視認性は弱い。   From FIG. 6 (a), the spectral transmittance of the plain portion of the multilayer paper 1 has many light transmission components from green to red, and when observed with actually transmitted light, it is observed in yellow-red. On the other hand, the spectral transmittance of the region printed with the ink containing 0.25% of the colored pigment 6 without using the pearl pigment 7 on the nonwoven fabric 4 of the multilayer paper 1a has a wavelength region of 600 to 700 nm, that is, a red component. The light transmittance is reduced by about 1 to 2%. On the other hand, the wavelength region of 500 to 570 nm, that is, the light transmittance of the green component does not change. As a result, the amount of light transmitted through the red component is reduced, resulting in a difference in contrast with the plain portion of the multilayer paper 1, and a green pattern 8 is observed. However, since the multilayer paper 1a has a low color pigment content of 0.25%, the visibility of the pattern 8 is weak.

次に、多層紙１ｂの不織布４にパール顔料７を用いず、着色顔料６を０．５％含むインキで印刷した領域の分光透過率は、図６（ａ）に示すように、５７０ｎｍ〜７００ｎｍの波長領域、すなわち、黄色から赤色成分にかけての光の透過率が３〜５％程度下がる。また、４００〜５７０ｎｍの波長領域、すなわち、紫色から緑色成分の光の透過率は２％程度下がる。つまり、測定した波長領域全体で透過率が下がり、特に、黄色から赤色成分にかけての透過率が下がっている。結果的に、多層紙１ｂは、多層紙１ａと比べて多層紙１の無地部とのコントラストの差がより大きくなり、多層紙１ａよりも視認性のよい緑色の図柄８が視認された。   Next, the spectral transmittance of the region printed with the ink containing 0.5% of the colored pigment 6 without using the pearl pigment 7 on the nonwoven fabric 4 of the multilayer paper 1b is 570 nm to 700 nm as shown in FIG. , That is, the light transmittance from yellow to red component is reduced by about 3 to 5%. In addition, the wavelength region of 400 to 570 nm, that is, the transmittance of light from purple to green components is reduced by about 2%. That is, the transmittance decreases in the entire measured wavelength region, and in particular, the transmittance from yellow to red components decreases. As a result, the multilayer paper 1b had a larger contrast difference from the plain paper of the multilayer paper 1 than the multilayer paper 1a, and the green pattern 8 having better visibility than the multilayer paper 1a was visually recognized.

次に、多層紙１の不織布４に着色顔料６を０．２５％、パール顔料７を１０％配合して印刷した領域の分光透過率に、図６（ａ）に示すように、多層紙１ｂの不織布４にパール顔料７を用いず、着色顔料６を０．５％含むインキで印刷した領域の分光透過率よりも、測定した波長領域全体で透過率が下がっている。結果的に、多層紙１は、多層紙１ｂと比べて多層紙１の無地部とのコントラストの差がより大きくなり、多層紙１ｂよりも視認性のよい図柄８が視認された。   Next, as shown in FIG. 6 (a), the multilayer paper 1b is shown in the spectral transmittance of the region printed by blending the non-woven fabric 4 of the multilayer paper 1 with 0.25% of the color pigment 6 and 10% of the pearl pigment 7. The transmittance of the entire measured wavelength region is lower than the spectral transmittance of the region printed with an ink containing 0.5% of the colored pigment 6 without using the pearl pigment 7 in the non-woven fabric 4. As a result, the multi-layer paper 1 has a greater difference in contrast with the plain portion of the multi-layer paper 1 than the multi-layer paper 1b, and the pattern 8 having better visibility than the multi-layer paper 1b was visually recognized.

次に、多層紙１ｃの不織布４に着色顔料６を０．５％、パール顔料７を１０％配合して印刷した領域の分光透過率は、図６（ａ）に示すように、多層紙１の不織布４に着色顔料６を０．２５％、パール顔料７を１０％配合して印刷した領域の分光透過率よりも、測定した波長領域全体で透過率が下がっている。結果的に、多層紙１ｃは、多層紙１と比べて多層紙１の無地部とのコントラストの差がより大きくなり、多層紙１よりも視認性のよい図柄８が視認された。   Next, as shown in FIG. 6 (a), the spectral transmittance of the region printed with the non-woven fabric 4 of the multi-layer paper 1c mixed with 0.5% of the color pigment 6 and 10% of the pearl pigment 7 is shown. The transmittance of the entire measured wavelength region is lower than the spectral transmittance of the region printed with 0.25% of the colored pigment 6 and 10% of the pearl pigment 7 in the non-woven fabric 4. As a result, the multi-layer paper 1c has a greater difference in contrast with the plain portion of the multi-layer paper 1 than the multi-layer paper 1, and the pattern 8 having better visibility than the multi-layer paper 1 was visually recognized.

次に、図６（ａ）と図６（ｂ）において、不織布４にパール顔料７を１０％に固定し、着色顔料６の割合を変更させて配合したインキを印刷した領域と、不織布４にパール顔料７を３０％に固定し、着色顔料６の割合を変更させて配合したインキを印刷した領域を比較すると、不織布４にパール顔料７を３０％に固定して着色顔料６の割合を変更させて配合したインキを印刷した多層紙１ｄ及び多層紙１ｅの方が、測定した波長領域全体で透過率が下がり、多層紙１の無地部とのコントラストの差が大きく、図柄８の視認性がよい結果であった。   Next, in FIGS. 6 (a) and 6 (b), the pearl pigment 7 is fixed to the nonwoven fabric 4 at 10%, and the area where the ink blended by changing the ratio of the colored pigment 6 is printed; Comparing the areas printed with ink mixed with pearl pigment 7 fixed at 30% and changing the ratio of colored pigment 6, the ratio of colored pigment 6 was changed by fixing pearl pigment 7 to 30% on nonwoven fabric 4. The multi-layer paper 1d and multi-layer paper 1e printed with the mixed ink have a lower transmittance in the whole measured wavelength region, a greater difference in contrast with the plain portion of the multi-layer paper 1, and the visibility of the pattern 8 is improved. It was a good result.

また、不織布４にパール顔料７を３０％に固定し、着色顔料６を０．２５％と着色顔料６を０．５％含むインキで印刷した多層紙１ｄと１ｅを比較すると、不織布４にパール顔料７を３０％に固定し、着色顔料６を０．５％含むインキで印刷した多層紙１ｅの方が、６００〜７００ｎｍの波長領域、すなわち、赤色成分の光の透過率が２％程度下がる結果であった。結果的に、多層紙１ｅは、多層紙１ｄと比べて多層紙１の無地部とコントラストの差がより大きくなるため、より視認性のよい図柄８が視認された。以上の結果から、今回作製した多層紙１及び多層紙１ａ〜１ｅにおいて、透過光で最も図柄８の視認性がよいのは多層紙１ｅであった。   Moreover, when the pearl pigment 7 is fixed to the nonwoven fabric 4 at 30%, and the multilayer papers 1d and 1e printed with ink containing 0.25% of the colored pigment 6 and 0.5% of the colored pigment 6 are compared, The multilayer paper 1e printed with an ink containing 0.5% of the colored pigment 6 with the pigment 7 fixed at 30% has a wavelength range of 600 to 700 nm, that is, the light transmittance of the red component is reduced by about 2%. It was a result. As a result, the multi-layer paper 1e has a greater difference in contrast with the plain portion of the multi-layer paper 1 compared to the multi-layer paper 1d. From the above results, in the multilayer paper 1 and the multilayer papers 1a to 1e produced this time, the multilayer paper 1e had the best visibility of the pattern 8 with transmitted light.

本発明の多層紙１に関する透過光での視認性について補足すると、例えば、多層紙１の無地部における透過光で観察される色は、図６（ｂ）に示す多層紙１の無地部を測定した波長領域全体の透過率の和に値することとなる。これに対して、例えば、多層紙１ｅを測定した波長領域全体の透過率の和は、半分程度となっている。このように、測定した波長領域全体の透過率の和が半分程度となっていることから、多層紙１の無地部から多層紙１ｅが視認されることは明らかである。同様に、多層紙１の無地部と多層紙１ａ〜多層紙１ｅ間において、それぞれ測定した波長領域全体の透過率の和に差が生じていることから、多層紙１の無地部と多層紙１ａ〜多層紙１ｅ間で、少なからず透過光の色の視認性に差が生じていることとなる。   Supplementing the visibility of the multilayer paper 1 according to the present invention with the transmitted light, for example, the color observed with the transmitted light in the plain portion of the multilayer paper 1 is measured on the plain portion of the multilayer paper 1 shown in FIG. This is equivalent to the sum of the transmittances in the entire wavelength region. On the other hand, for example, the sum of the transmittances of the entire wavelength region measured for the multilayer paper 1e is about half. Thus, it is clear that the multilayer paper 1e is visually recognized from the plain portion of the multilayer paper 1 because the sum of the transmittances of the entire wavelength region measured is about half. Similarly, since there is a difference in the total transmittance of the entire wavelength region measured between the plain part of the multilayer paper 1 and the multilayer paper 1a to the multilayer paper 1e, the plain part of the multilayer paper 1 and the multilayer paper 1a The difference in the visibility of the color of the transmitted light is not small between the multilayer papers 1e.

また、リーフィング処理を施すことによって、パール顔料６の配合量を減らすことができ、製造コストを下げることができる。   Further, by applying the leafing treatment, the blending amount of the pearl pigment 6 can be reduced, and the manufacturing cost can be reduced.

また、本実施の形態では、上部紙層２及び下部紙層３を、坪量３５ｇ／ｍ2、厚さ０．０５０ｍｍ、不透明度６６％で構成しているが、坪量が３５ｇ／ｍ2より低い場合、つまり不透明度が６６％より低い場合においても、着色顔料６とパール顔料７の配合量を調整することにより、上部紙層２側から観察した場合の反射光を無彩色とすることができるので、従来の発明のように、用紙の不透明度が限定された範囲で反射光による図柄等が視認できなくする方法とは異なり、従来よりも広い範囲の用紙の形態において、反射光では図柄が視認できず、透過光で図柄が視認できる多層紙を製造することができる。 In the present embodiment, the upper paper layer 2 and the lower paper layer 3 are configured with a basis weight of 35 g / m 2 , a thickness of 0.050 mm, and an opacity of 66%, but the basis weight is 35 g / m 2. Even when the opacity is lower than 66%, the reflected light when viewed from the upper paper layer 2 side is made achromatic by adjusting the blending amount of the colored pigment 6 and the pearl pigment 7. Therefore, unlike the conventional invention in which the reflected light pattern or the like is not visible in a range where the opacity of the paper is limited, in the form of the paper in a wider range than in the conventional case, the reflected light It is possible to produce a multilayer paper in which the design is not visible and the design is visible with transmitted light.

この上部紙層２及び下部紙層については、各々坪量２０〜５０ｇ／ｍ2、厚さ０．０３５〜０．０５０ｍｍ、不透明度が４０〜９０％の範囲であれば、本発明の効果を奏することができる。特に、中間層又は上部紙層と下部紙層が接する面に形成された図柄を反射光で視認できなくするために、上部紙層と下部紙層の不透明度の範囲は、本発明では重要な要素である。 For the upper paper layer 2 and the lower paper layer, if the basis weight is 20 to 50 g / m 2 , the thickness is 0.035 to 0.050 mm, and the opacity is in the range of 40 to 90%, the effect of the present invention is achieved. Can play. In particular, the range of opacity of the upper paper layer and the lower paper layer is important in the present invention in order to make the pattern formed on the surface where the intermediate paper layer or the upper paper layer and the lower paper layer contact each other visible with reflected light. Is an element.

また、従来の発明、例えば、特許文献２記載の防護紙と同程度の坪量（１９〜５０ｇ／ｍ2）、不透明度（７５％〜８５％）を有する形態の用紙を用いて多層紙を製造する場合、着色顔料６と補色の関係のパール顔料７を用いることで、反射光でほぼ無彩色とするため、従来の発明よりも着色顔料６の配合量を増やすことができるので、透過光で、より視認性のよいカラーのすき入れが得られる。 In addition, a multilayer paper using a paper having a form having a basis weight (19 to 50 g / m 2 ) and opacity (75% to 85%) comparable to that of the conventional invention, for example, protective paper described in Patent Document 2. In the case of manufacturing, the color pigment 6 and the complementary pearl pigment 7 are used so that the reflected light is almost achromatic, so that the blending amount of the color pigment 6 can be increased as compared with the conventional invention. Thus, a clearer color can be obtained.

以上のように、本実施の形態では、パール顔料７にリーフィング処理を施した形態の多層紙１について説明したが、リーフィング処理を施さないパール顔料７を用いた多層紙でも、着色顔料６とパール顔料７の配合割合を調整することによって反射光で図柄８が視認できず、透過光で図柄８が視認できる多層紙１を製造することができる。ただし、本発明の効果をより奏するためにはリーフィング処理を施す方が好ましい。   As described above, in the present embodiment, the multilayer paper 1 in a form in which the pearl pigment 7 is subjected to the leafing treatment has been described. However, even in the multilayer paper using the pearl pigment 7 not subjected to the leafing treatment, the colored pigment 6 and the pearl pigment 7 are used. By adjusting the blending ratio of the pigment 7, the multilayer paper 1 in which the pattern 8 cannot be visually recognized by reflected light and the pattern 8 can be visually recognized by transmitted light can be manufactured. However, in order to achieve the effects of the present invention, it is preferable to perform a leafing process.

以下、実施例を用いて本発明を更に詳細に説明するが、本発明の内容は、これらの実施例の範囲に限定されるものではない。   EXAMPLES Hereinafter, although this invention is demonstrated further in detail using an Example, the content of this invention is not limited to the range of these Examples.

（実施例１）
実施例１では、上部紙層及び下部紙層の１層当たりの坪量を３０ｇ／ｍ2、厚さ０．０５０μｍ、不透明度を６６％とした。着色顔料としてブルーインキ（大日精化工業製 シアニンブルー３４６３）を０．２５％、パール顔料としてリーフィング処理を施した金色パール顔料（メルク製 ＮＥＷ２０１）を１０％配合したインキにより図柄を不織布に印刷し、上部紙層、図柄が印刷された不織布及び下部紙層を積層した多層紙を作製した。本実施例１の多層紙を反射光で観察した場合、図柄は視認されず、透過光で観察した場合、図柄がブルー色で視認された。 Example 1
In Example 1, the basis weight per layer of the upper paper layer and the lower paper layer was 30 g / m 2 , the thickness was 0.050 μm, and the opacity was 66%. A pattern is printed on a non-woven fabric with ink containing 0.25% blue ink (Cyanine Blue 3463 manufactured by Dainichi Seika Kogyo Co., Ltd.) and 10% golden pearl pigment (Newk 201 manufactured by Merck) with leafing treatment as pearl pigment. Then, a multilayer paper in which an upper paper layer, a non-woven fabric printed with a pattern, and a lower paper layer were laminated was prepared. When the multilayer paper of Example 1 was observed with reflected light, the design was not visually recognized. When observed with transmitted light, the design was visually recognized in blue.

（実施例２）
実施例２では、上部紙層及び下部紙層の１層当たりの坪量を３０ｇ／ｍ2、厚さ０．０５０μｍ、不透明度を６６％とした。また、図６に示すように、着色顔料としてブルーインキ（大日精化工業製 シアニンブルー３４６３）を０．２５％、パール顔料としてリーフィング処理を施した金色パール顔料（メルク製 ＮＥＷ２０１）を１０％配合したインキを用いて、第１の印刷領域９を不織布４に印刷した。また、着色顔料としてグリーンインキ（大日精化工業製 ダイピロキサイドカラーグリーン ＃９３２０）を０．２５％、パール顔料としてリーフィング処理を施したマゼンタ色の粉末パール顔料（メルク製 ＮＥＷ２１１）を１０％配合したインキを用いて、第２の印刷領域１０を不織布４に印刷した。そして、上部紙層、第１の印刷領域及び第２の印刷領域が印刷された不織布４及び下部紙層を積層した多層紙を作製した。実施例２の多層紙を反射光で観察した場合、第１の印刷領域及び第２の印刷領域は視認されず、透過光で観察した場合、第１の印刷領域及び第２の印刷領域がブルーとグリーンのカラーの２色として視認された。 (Example 2)
In Example 2, the basis weight per layer of the upper paper layer and the lower paper layer was 30 g / m 2 , the thickness was 0.050 μm, and the opacity was 66%. As shown in FIG. 6, 0.25% of blue ink (Cyanine Blue 3463 manufactured by Dainichi Seika Kogyo Co., Ltd.) is used as a color pigment, and 10% of gold pearl pigment (MELK NEW 201) which has been subjected to leafing treatment as a pearl pigment. The first printed region 9 was printed on the nonwoven fabric 4 using the ink thus prepared. Also, 0.25% green ink (Daipyroxide Side Color # 9320 manufactured by Dainichi Seika Kogyo Co., Ltd.) is used as the coloring pigment, and 10% blended magenta powder pearl pigment (MELK NEW 211) is used as the pearl pigment. The second printed region 10 was printed on the nonwoven fabric 4 using the ink thus prepared. And the multilayer paper which laminated | stacked the nonwoven fabric 4 and the lower paper layer in which the upper paper layer, the 1st printing area | region, and the 2nd printing area | region were printed was produced. When the multilayer paper of Example 2 is observed with reflected light, the first print area and the second print area are not visually recognized. When observed with transmitted light, the first print area and the second print area are blue. And green as two colors.

（実施例３）
実施例３では、上部紙層及び下部紙層の１層当たりの坪量を２０ｇ／ｍ2、厚さ０．０３５μｍ、不透明度を４３％とした。パール顔料としてリーフィング処理を施したマゼンタ色の粉末パール顔料（メルク製 ＮＥＷ２１１）を２０％、着色顔料としてグリーンインキ（大日精化工業製 ダイピロキサイドカラーグリーン ＃９３２０）を０．２５％配合したインキを用いて不織布に図柄を印刷し、上部紙層、図柄が印刷された不織布及び下部紙層を積層した多層紙を作製した。実施例３の多層紙において、多層紙の無地部と不織布に印刷された図柄の色相ａ*の差は、測定角度０度のとき０．５程度であり、不織布に印刷した図柄を上部紙層側から目視で観察した場合、多層紙の無地部と同様な色で視認された。また、透過光による図柄の視認性についても問題なくカラーとして得られた。 (Example 3)
In Example 3, the basis weight per layer of the upper paper layer and the lower paper layer was 20 g / m 2 , the thickness was 0.035 μm, and the opacity was 43%. Ink containing 20% of magenta powdered pearl pigment (Melk's NEW211) with leafing treatment as pearl pigment and 0.25% of green ink (Daipyrokusai Color Green # 9320, manufactured by Dainichi Seika Kogyo) as coloring pigment. The pattern was printed on the non-woven fabric using, and the upper paper layer, the non-woven fabric on which the design was printed, and the lower paper layer were laminated to produce a multilayer paper. In the multilayer paper of Example 3, the difference between the hue a * of the pattern printed on the plain part of the multilayer paper and the nonwoven fabric is about 0.5 when the measurement angle is 0 degree, and the pattern printed on the nonwoven fabric is the upper paper layer. When visually observed from the side, it was visually recognized in the same color as the plain portion of the multilayer paper. Moreover, the visibility of the pattern by transmitted light was obtained as a color without any problem.

（ａ）は、本発明における多層紙の断面図を示す図、（ｂ）は、不織布に印刷した図柄を示す図である。(A) is a figure which shows sectional drawing of the multilayer paper in this invention, (b) is a figure which shows the design printed on the nonwoven fabric. 多層紙にＲＧＢ成分を含む光が照射されたときの、透過光及び反射光の状態を示す図である。It is a figure which shows the state of the transmitted light and reflected light when the light containing RGB component is irradiated to the multilayer paper. （ａ）は、本発明における多層紙を、反射光で観察した場合に得られる図柄を示す図、（ｂ）は、本発明の多層紙を、透過光で観察した場合に得られる図柄を示す図である。(A) is a figure which shows the pattern obtained when the multilayer paper in this invention is observed with reflected light, (b) shows the pattern obtained when the multilayer paper of this invention is observed with transmitted light. FIG. （ａ）は、多層紙の無地部に対する色相ａ*の差を示す図、（ｂ）は、多層紙の無地部に対する色相ｂ* の差を示す図である。(A) is a figure which shows the difference of the hue a * with respect to the plain part of multilayer paper, (b) is a figure which shows the difference of the hue b * with respect to the plain part of multilayer paper. （ａ）は、多層紙の無地部に対する色相ａ*の差を示す図、（ｂ）は、多層紙の無地部に対する色相ｂ* の差を示す図である。(A) is a figure which shows the difference of the hue a * with respect to the plain part of multilayer paper, (b) is a figure which shows the difference of the hue b * with respect to the plain part of multilayer paper. （ａ）は、多層紙の分光透過率を示す図、（ｂ）は、多層紙の分光透過率を示す図である。(A) is a figure which shows the spectral transmittance of multilayer paper, (b) is a figure which shows the spectral transmittance of multilayer paper. 実施例２の多層紙の不織布に印刷した図柄を示す図である。It is a figure which shows the design printed on the nonwoven fabric of the multilayer paper of Example 2. FIG.

符号の説明Explanation of symbols

１ 多層紙
２ 上部紙層
３ 下部紙層
４ 不織布
５ 印刷層
６ 着色顔料
７ パール顔料
８ 図柄
９ 第１の印刷領域
１０ 第２の印刷領域 DESCRIPTION OF SYMBOLS 1 Multilayer paper 2 Upper paper layer 3 Lower paper layer 4 Nonwoven fabric 5 Print layer 6 Color pigment 7 Pearl pigment 8 Pattern 9 1st print area 10 2nd print area

Claims (4)

上部紙層と下部紙層と少なくとも１層から成る中間層から構成される多層紙において、前記中間層は、一方の面に、補色又はほぼ補色関係にあるパール顔料と着色顔料を有するインキにより図柄が形成された少なくとも１層から成り、前記上部紙層及び下部紙層は不透明度が４０〜９０％の範囲であることを特徴とする多層紙。   In a multilayer paper composed of an intermediate layer composed of an upper paper layer, a lower paper layer, and at least one layer, the intermediate layer is designed with an ink having a pearl pigment and a color pigment that are complementary or substantially complementary on one surface. A multilayer paper, wherein the upper paper layer and the lower paper layer have an opacity range of 40 to 90%. 上部紙層と下部紙層から構成される多層紙において、前記上部紙層と下部紙層が接する面の一方の紙層面に、補色又はほぼ補色関係にあるパール顔料と着色顔料を有するインキにより図柄が形成され、前記上部紙層及び下部紙層は不透明度が４０〜９０％の範囲であることを特徴とする多層紙。   In a multilayer paper composed of an upper paper layer and a lower paper layer, an image having a pearl pigment and a coloring pigment having a complementary color or a substantially complementary color is formed on one paper layer surface of the surface contacting the upper paper layer and the lower paper layer. And the upper paper layer and the lower paper layer have an opacity range of 40 to 90%. 前記中間層は、不織布であることを特徴とする請求項１記載の多層紙。   The multilayer paper according to claim 1, wherein the intermediate layer is a non-woven fabric. 前記パール顔料は、リーフィング処理が施されていることを特徴とする請求項１乃至３記載の多層紙。   4. The multilayer paper according to claim 1, wherein the pearl pigment is subjected to a leafing treatment.
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JP2003285527A (en) * 2002-03-28 2003-10-07 National Printing Bureau Laminate having light reflective base material
JP2004002565A (en) * 2002-05-31 2004-01-08 Kyodo Printing Co Ltd Forgery preventing ink and forgery preventing printed matter
JP2005279940A (en) * 2004-03-26 2005-10-13 Dainippon Printing Co Ltd Security sheet

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CN102350838A (en) * 2011-08-29 2012-02-15 阳江市科纳彩木工业有限公司 Novel anti-fake sheet material and manufacturing method thereof
JP2017154455A (en) * 2016-03-04 2017-09-07 北越紀州製紙株式会社 Layered body
JP2020100061A (en) * 2018-12-21 2020-07-02 凸版印刷株式会社 Forgery prevention medium, displaying method, and manufacturing method thereof
JP7251134B2 (en) 2018-12-21 2023-04-04 凸版印刷株式会社 Anti-counterfeit medium, display method and method for producing the same
JP2021011066A (en) * 2019-07-05 2021-02-04 凸版印刷株式会社 Information recording body, thermal transfer medium, and method for manufacturing information recording body
JP7326940B2 (en) 2019-07-05 2023-08-16 凸版印刷株式会社 Information recording medium and verification method for information recording medium

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