JP4831963B2 - Paper with identification ability - Google Patents

Description

  The present invention relates to a sheet having self-other identification ability. More specifically, the present invention relates to a paper having self-other identification ability that is suitably used for manufacturing a label or a tag attached to an article or its packaging box in order to prove the authenticity of the article.

Recently, due to technological advances, various anti-counterfeit printed materials (printed products that require security such as gift certificates, admission tickets, and banknotes) can be used with multicolor printers, color copiers, and scanners linked to personal computers. In many cases, the image is forged by a method of taking an image and printing it with a color printer.

  In the preferred field of use of the paper having self-other identification ability of the present invention, there are various items and labels and tags attached to their packaging boxes and the like in order to prove that the item is authentic. Since these labels, tags, and the like are manufactured using extremely advanced anti-counterfeiting technology, the consumer can authenticate that an article to which the labels, tags, etc. are attached is authentic. It can also be used as a means for manufacturers of various articles to distinguish between their products (genuine products) and counterfeit products at dealers.

  The performance that is always required for the labels and tags as described above is that it is difficult to forge. In particular, expensive goods (many of which are called “brand goods”) always have the risk of being counterfeited, so the labels and tags that are affixed to them are sophisticated enough to give up the person who intends to forge. It is required to be manufactured using an anti-counterfeit technology. In addition, it is also required that the label or the like be designed to be easily destroyed when the analysis is attempted by removing the label with an organic solvent or water for the purpose of counterfeiting the label or the like. By configuring the label in such a manner, it is possible to prevent a crime in which a genuine label is peeled off and pasted on a forged article as if it is a genuine article.

  With respect to labels and tags that are difficult to counterfeit, various configurations have been proposed. First, the first means is to increase the anti-counterfeit effect by using a film that is difficult to counterfeit for the base serving as a base material or using paper that is difficult to counterfeit (anti-counterfeit paper). The second means is to perform processing such as anti-counterfeit printing on the surface of the base serving as the base material.

As an example of anti-counterfeiting technology, there is a technique using metallic luster, pearl luster, or iris color (interference color). These anti-counterfeit prints with metallic luster, pearl luster, and iris color depend on the method using a multicolor printing machine, the method using a color copier, the method of capturing an image with a scanner linked to a personal computer, and printing with a color printer, etc. It uses that it cannot be reproduced. For example, the present applicant forms a partial coating layer mainly composed of a pearl pigment and an adhesive on the surface of the base paper in Patent Document 1 to obtain an anti-counterfeit paper, and performs printing using this paper to prevent forgery. Proposed to get printed matter.

Similarly, in the case of Patent Document 2, the present applicant is made of two or more layers of combined paper, the outermost paper layer 2 is 20 to 50 g / m ² , and includes strips having glitter. We proposed anti-counterfeit paper characterized by this.

Further, in Patent Document 3, at least one or more layers of a base printing film formed on the substrate to be printed for improving the smoothness of the surface of the substrate to be printed formed by using an ink not containing a pearl pigment are laminated. There has also been proposed a pearl-like printed matter characterized in that at least one layer of a pearl printing coating formed using a pearl ink containing a pearl pigment is laminated on the base printing coating. Yes. In this invention, when producing a pearl-like printed matter using offset printing or letterpress printing, the surface of the substrate to be printed is rough, and the orientation direction of the pearl pigment in the printed coating film is not constant. Therefore, it is an object to solve the problem that the obtained pearl luster is insufficient. In addition, in the present invention, in order to make the pearl luster of the upper layer pearl print coating easy to see, it has also been proposed that the hue of the base print coating be a dark color with relatively low brightness.

  In addition, in the patent document 4, the applicant of the present invention combines a kind of metamerism in the visible light region and the infrared region and a pearl pigment coating layer to provide a pearl pigment coated paper and a printed matter having an unprecedented authenticity determination function. Proposed. The gist of this proposal is that on the surface of a colorless sheet-like material, a printed layer such as a pattern or characters having the ability to reflect infrared rays, a printed layer such as a pattern or characters having the ability to absorb infrared rays, and a pearl. A pigment coating layer is provided, and the printed layer of a pattern or characters having the ability to reflect infrared rays and the printed layer of a pattern or characters having the ability to absorb infrared rays are usually under light. Thus, there is a need to obtain a pearl pigment coated sheet having a true color determination function, characterized in that it looks the same color and has different spectral reflectances in the infrared region.

  The hues of the pearl pigments proposed in Patent Document 1 and Patent Document 2 have a mild pearl tone and lack in contrast with the color of the paper, resulting in a poor visibility. Further, the pearl-like printed matter proposed in Patent Document 3 described above may be forged relatively easily if this mechanism is known. Also, even if these papers and printed materials are used as labels for certifying that an article is authentic, the labels can be easily removed using water or organic solvents. Another problem is that it is difficult to prevent the crime described above, which is pasted on the surface of a forged product. As a result of various studies, the inventors of the present invention have previously proposed a label paper having completely new self-other identification capability, which has solved the disadvantages of the prior art, as Patent Document 5.

  The gist of this proposal (Patent Document 5) is that a coating layer that dissolves or swells with a hydrophilic solvent, a coating layer that dissolves or swells with a lipophilic solvent, and a pearl pigment coating layer are sequentially provided on the surface of the base paper. A label paper having self-other identification ability, a coating layer that dissolves or swells with a lipophilic solvent, a coating layer that dissolves or swells with a hydrophilic solvent, and a pearl pigment coating. An object of the present invention is to obtain a label sheet having self-other identification ability, characterized by sequentially providing layers.

JP-A-6-313298 Japanese Patent No. 3075454 JP 2001-260517 A Japanese Patent Application No. 2002-184668 Japanese Patent Application No. 2004-243589

  An object of the present invention is to propose a paper in which a more advanced anti-counterfeit technology is incorporated in the label paper having the self-other identification ability proposed in Patent Document 5 above. More specifically, the anti-counterfeiting technology means that when a sheet is observed with a device capable of visualizing infrared rays, a printed portion of characters or images that cannot be visually recognized under normal light can be visually recognized. This means advanced anti-counterfeiting technology.

The gist of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are partially enlarged cross-sectional views of a sheet having self-other identification capability according to the present invention. The first invention of the present invention is dissolved or swollen on the surface of a base paper 1 by a hydrophilic solvent. The coating layer 2, the coating layer 3 that dissolves or swells with the oleophilic solvent, and the pearl pigment coating layer 4 are sequentially provided. The coating layer 4, the coating layer 3, and the coating layer 2 are either Has a property of substantially transmitting infrared rays, the coating layer 2 and / or the coating layer 3 are colored, and the surface of the base paper 1 and / or the coating layer 2 and / or the coating layer 3 are colored. The printed portion 5 that substantially absorbs infrared rays is provided on the surface of the paper, and when the printed portion 5 is observed from the surface of the paper, the printed portion 5 is substantially invisible under normal light. It is a sheet having self-other identification ability.

Further, as shown in FIG. 2, the second invention of the present invention is a coating layer 3 that is dissolved or swelled by a lipophilic solvent on the surface of the base paper 1, and a coating layer that is dissolved or swelled by a hydrophilic solvent. 2. A pearl pigment coating layer 4 is sequentially provided, and the coating layer 4, the coating layer 2, and the coating layer 3 all have a property of substantially transmitting infrared rays, and the coating layer 3 And / or the coating layer 2 is colored, and the surface of the base paper 1 and / or the surface of the coating layer 3 and / or the coating layer 2 is provided with a printing portion 5 that substantially absorbs infrared rays. The printed portion 5 is a sheet having self-other identification characteristics characterized in that the printed portion 5 cannot be substantially visually recognized under normal light when observed from the surface of the sheet.

The paper having self-other identification capability of the present invention is used for applications (for example, labels and tags) that require self-other identification capability, and has the following effects.
1) Various materials constituting the paper use materials that are not easily available, and are excellent in preventing forgery.
2) When used on a label, try to peel off the label affixed to the surface of the article using water, an organic solvent, or a label remover to weaken the adhesive or adhesive strength of the adhesive or adhesive. However, since either the coating layer 2 that dissolves or swells with the hydrophilic solvent or the coating layer 3 that dissolves or swells with the oleophilic solvent that constitutes the interlayer of the label, the label is destroyed. End up. Or the pearl luster feeling of the pearl pigment luster layer 4 will fall significantly because the coating layers 2 and 3 swell. This has a great effect on prevention of crime by peeling off the label and sticking it on the surface of a forged product.
3) Further, when the analysis is attempted by peeling off the label with an organic solvent or water for the purpose of forgery of the label or the like, the analysis becomes difficult because the label or the like is destroyed, and the forgery prevention effect is greatly enhanced.

The first aspect of the present invention will be described first.
The base paper 1 is mainly composed of wood pulp such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP) as raw material pulp, and hemp, bamboo as required. Non-wood pulp such as straw, kenaf, synthetic pulp, synthetic fiber, semi-synthetic fiber, etc., and clay, kaolin, talc, titanium dioxide, calcium carbonate, aluminum hydroxide powder, etc. Additives for internal additives, coloring dyes and pigments, sizing agents such as rosin sizing agents, dry paper strength enhancers such as polyacrylamide, wet paper strength enhancers such as polyamide, polyamine, epichlorohydrin and melamine resin, sulfuric acid A paper material is prepared by appropriately adding a papermaking auxiliary material such as a fixing agent such as a band, and generally has a freeness of 300 to 500. lC. S. F. According to a conventional method, the paper is usually made at a basis weight of 50 to 150 g / m ² using a circular paper machine, a long paper machine, a short paper machine, a combination thereof, or a paper machine such as a twin wire paper machine. .

The base paper 1 may use various forgery prevention techniques in order to enhance the forgery prevention effect. For example, various conventionally proposed anti-counterfeiting techniques such as thread insertion, mixing of colored fibers, mixing of ultraviolet fluorescent fibers, mixing of ultraviolet fluorescent coloring particles, mixing of anti-counterfeit strips, etc. can be employed. The term “ultraviolet fluorescent fiber” or “ultraviolet fluorescent coloring particle” as used herein means a fiber or particle that develops a fluorescent color when irradiated with ultraviolet rays.

In the present invention, if the base paper 1 is a multi-layered laminated paper and at least one of the paper layers is lower than the paper interlayer strength of the other paper layers, the base paper 1 is used for labeling. When the label is peeled off after being manufactured and pasted on the surface of an article or the like, the label itself is destroyed because it is peeled off from the paper layer having a low paper interlayer strength. This is preferable because it increases the effect of preventing the crime of attaching a regular label to a forged article. As a means for lowering the paper interlayer strength, a method using a fiber for paper making with a short fiber length, a method for lowering the beating of the paper constituting the paper layer, a paper strength enhancer is not used, or the amount added is reduced. A well-known method such as a method, a method of lowering the bond strength between fibers using a synthetic fiber, or the like can be adopted. The paper layer strength of the paper layer having the lowest paper layer strength is usually 30 to 70 gf / 15 mm (MD) as a T-shaped peeling force measured with a universal tensile tester.

If necessary, a styrene resin, styrene / acrylic resin, styrene / maleic resin, alkyl ketene dimer can be used to improve the paper surface strength of the base paper using a size press machine during the paper making stage of the base paper. Synthetic resins such as starch, oxidized starch, starch such as hydroxyethylated starch and modified starch and starch derivatives, cellulose derivatives such as carboxymethylcellulose, carboxyethylcellulose, carboxymethylated guar gum, phosphorylated guar gum, oxidized guar gum, polyvinyl A chemical such as alcohol or polyacrylamide may be applied to the surface. Further, it is also possible to appropriately apply a coating solution used for finely coated paper using a bill blade coater or the like to several g / m ² (dry mass, the same applies hereinafter).

A resin coating layer and a pigment coating layer can be provided on the surface of the base paper 1 as necessary. These coating layers may or may not have a property of dissolving or swelling in a hydrophilic solvent or a lipophilic solvent. In the present invention, if a resin coating layer or a pigment coating layer is provided on the surface of the base paper 1, the effect of the pearl pigment coating layer 4, that is, a function of enhancing the pearly luster, is provided. Is preferable. The reason for this is that when these coating layers are provided, the surface smoothness is increased, and the pearly luster of the pearl pigment coating layer is increased due to the effect. The pearl pigment has a flat shape, and the smoother the base material, the more the pearl pigments in the pearl pigment coating layer that are coated on it are arranged more evenly. To increase.

Resin coating layers include well-known aqueous coating solutions such as styrene / butadiene / latex, methyl methacrylate / butadiene / latex, starch, polyvinyl alcohol, acrylic ester resins, vinyl resins, polyester resins, cellulose resins, etc. The coating liquid obtained by dissolving the organic solvent in an organic solvent is usually applied on the surface of the base paper at a rate of 3 to 30 g / m ² using a known coating machine such as an air knife coater, gravure coater, roll coater, or various printing machines. It is obtained by.

The pigment coating layer is made of one or more of known white coating powders such as kaolin, calcium carbonate, titanium dioxide, aluminum hydroxide powder, styrene / butadiene / latex, methyl methacrylate / butadiene / latex, starch, polyvinyl Mainly composed of one or more types of known adhesives such as alcohol, and coating materials are prepared by appropriately using auxiliary materials for coating such as dispersants, water resistance agents, preservatives, fungicides, etc. In addition, it is usually obtained by applying 3 to 30 g / m ^{2 on} the surface of the base paper using a known coating machine such as an air knife coater, a blade coater, or a roll coater. As will be described later, the pigment coating layer needs to have the ability to substantially reflect normal light and infrared rays that can achieve the object of the present invention.

  At this time, a coloring agent such as a dye or a coloring pigment may be added to the coating solution as long as the object of the present invention is not impaired. In order to enhance the effect of preventing counterfeiting, a water-insoluble organic solvent-soluble dye powder that develops fluorescence when irradiated with ultraviolet rays or a pigment that develops fluorescence when irradiated with ultraviolet rays can be added.

The colored coating layer 2 that is dissolved or swelled by the hydrophilic solvent is a crime to re-apply the above-mentioned label by dissolving or swelling the layer when the label is peeled off by water. It plays a role of preventing, a role of enhancing the pearly luster of the pearl pigment coating layer 4, and a role of substantially transmitting infrared rays as described later. Since the effect of strengthening the pearly luster of the pearl pigment coating layer 4 increases as the brightness of the coating layers 2 and 3 decreases, the brightness of the coating layers 2 and 3 is preferably lower in the present invention.
The colored coating layer 2 that is dissolved or swelled by the hydrophilic solvent is formed mainly of a binder and a colorant. As the binder, a starch-based adhesive, a polyvinyl alcohol-based adhesive, carboxymethyl cellulose, casein, a water-soluble acrylic resin, or other resin that dissolves in water or hot water is used, and one or several of these resins are colored. A coating liquid is prepared by adding dyes and pigments as an agent and auxiliary materials for coating such as a dispersant as necessary. Next, using a known coating machine such as an air knife coater, blade coater, roll coater, etc., the surface of the base paper or the surface of the resin coating layer or the pigment coating layer is usually coated with 5 to 30 g / m ² . .

In addition, the colored coating layer 3 that is dissolved or swelled by the oleophilic solvent is said to be reapplied by the above-mentioned label being dissolved or swollen when the label is peeled off by the organic solvent. It plays the role of preventing crime, the role of enhancing the pearly luster of the pearl pigment coating layer 4 as described above, and the role of substantially transmitting infrared rays as described later. The colored coating layer 3 that is dissolved or swelled by the oleophilic solvent is formed mainly of a binder and a colorant. Examples of binders include aliphatic hydrocarbons such as cyclohexane such as polystyrene resin, vinyl acetate resin, methacrylic acid resin, vinyl chloride resin, epoxy resin, modified cellulose resin, and polycarbonate resin, and aromatic hydrocarbons such as toluene and xylene. Resins that are soluble in organic solvents such as higher alcohols such as isopropyl alcohol, acetates such as ethyl acetate, ketones such as acetone, methyl ethyl ketone, and glycol ethers such as ethyl cellosolve are used. One or several kinds of resins, a dye or pigment as a colorant, and auxiliary materials for coating such as a dispersant are added as necessary to prepare a coating solution. Subsequently, using a known coating machine such as a gravure coater or a roll coater, 5 to 30 g / m ² is usually applied to the surface of the colored coating layer 2 that is dissolved or swelled by the hydrophilic solvent.

In the present invention, the coating layer 2 that dissolves or swells with a hydrophilic solvent and the coating layer 3 that dissolves or swells with a lipophilic solvent may be formed as a plurality of layers. In particular, as the coating layer 3 that is dissolved or swelled by the oleophilic solvent, it is possible to form a plurality of layers by changing the type of the binder that is dissolved or swelled by various organic solvents as described above. This is preferable because it makes it easier to deal with crimes such as those described above that attempt to remove the label.

In the present invention, it is necessary that either one of the coating layer 2 that is dissolved or swelled by the hydrophilic solvent, the coating layer 3 that is dissolved or swelled by the lipophilic solvent, or both are colored. The reason is that when a colorant is added to the coating layers 2 and 3, the effect of increasing the pearly luster after providing the pearl pigment coating layer 4 is obtained as compared with the case where no colorant is added. Because you can. In particular, as described above, this effect is increased by adding a colorant having low brightness. For this reason, it is preferable to use a black colorant as the colorant in the present invention. As the colorant, a well-known color dye and / or color pigment is used. As the coloring dye, it is preferable to use a well-known dye such as a direct dye having a low brightness such as black, black gray, black blue, and black brown, an acid dye, a basic dye, and a disperse dye for the reasons described above. Moreover, it is preferable to use organic pigments, such as a lake pigment and a toner pigment, and inorganic pigments, such as a bitumen and a bengara, similarly as a coloring pigment with low brightness. The most effective one is a black dye / pigment. In the present invention, these dyes and pigments are used alone or in combination of two or more, and the amount added to the adhesive is usually 5% by mass to 50% by mass. Moreover, the coating amount is 3-15 g / m < ² > normally. In the present invention, the coating layer 2 that dissolves or swells with these hydrophilic solvents and the coating layer 3 that dissolves or swells with a lipophilic solvent substantially transmit infrared rays that can achieve the object of the present invention. It is necessary to have Therefore, it is necessary to select a colorant that does not impair the object of the present invention.

The pearl pigment coating layer 4 has a special function that cannot be reproduced by a method using a multi-color printing machine, a method using a color copying machine, a method of capturing an image with a scanner linked to a personal computer, and printing with a color printer or the like. Provided for holding. The pearl pigment coating layer 4 of the present invention can be obtained by printing or coating a coating liquid or ink mainly composed of a pearl pigment and a binder. Pearl pigments are natural pearl essence, mica powder, basic carbonate, fish scale foil, flaky cholesteric liquid crystal, optical interference film or hologram film in flaky shape, and flaky powder is coated with a thin film to apply light. A material that exhibits pearly luster by interference is preferably used. As the flaky powder, for example, natural or synthetic mica, plate-like alumina, plate-like silica, talc, bismuth oxychloride, glass flakes, silicon dioxide flakes, and plastic flakes are suitable. In addition, as a thin film material to be coated, a uniform layer of titanium dioxide, zirconium oxide, iron dioxide, chromium oxide, cobalt oxide, organic dye or the like is coated on at least the surface of the flaky powder and one or more of these are coated. To do. Or you may use the pearl pigment which reduced the titanium oxide coat | covered on the surface of the flaky powder, and improved the brightness as low-order titanium oxide. As will be described later, the pearl pigment coating layer 4 needs to have a performance of substantially transmitting infrared rays that can achieve the object of the present invention.

  The pearl pigment used in the present invention can be suitably used in the present invention because it can exhibit a characteristic that the hue changes depending on the viewing angle when an interference color is used. That is, an interference color pearl pigment that appears red when viewed perpendicularly to the coated surface can visually recognize a bluish green pearl luster that is complementary to the red color when viewed with the coated surface tilted. Here, in the case of light, complementary color refers to the relationship between two colors that become achromatic when mixed, and corresponds to the colors on the opposite sides of the Munsell hue ring. Examples are blue-green for red and yellow-green for purple. In the present invention, the authenticity determination function can be further enhanced by using a pearl pigment that emits such an interference color.

  In the present invention, when a cholesteric liquid crystal is used as a pearl pigment, the authenticity determination function can be further improved as described later. The cholesteric liquid crystal has a layered structure, the molecular long axis direction and the layer surface of each layer are parallel to each other, and each layer is rotated and layered slightly (having a spiral structure). As a result, it has the property of selectively reflecting certain incident light. For example, a cholesteric liquid crystal that reflects light of a red wavelength is coated on a black base film to produce white light such as sunlight. , The red light is reflected and the remaining wavelengths are absorbed, so it looks red with vivid pearl luster.

  In addition, cholesteric liquid crystal has optical coherence and has another advantage that the hue changes depending on the viewing angle, which is a preferable feature for authenticity determination. In addition, when the coated surface of the cholesteric liquid crystal is observed through a polarizing filter, a unique phenomenon in which the brightness of the coated surface changes due to a change in the position of the polarizing filter can be observed. Since this phenomenon does not occur with pearl pigments other than cholesteric liquid crystals, this is also a preferable feature for authenticity determination.

In addition, the spiral direction of the cholesteric liquid crystal has either a right rotation or a left rotation depending on the chemical structure. This means that when a right-rotating circularly polarizing plate and a left-rotating circularly polarizing plate are placed on the pearl pigment coating layer and observed, the pearl pigment coating layer appears to have a different color. The forgery prevention effect will be expressed.

Binders used in combination with pearl pigments include melamine resin, urea resin, phenol resin, alkyd resin, petroleum resin, polyester resin, polyurethane resin, polyvinyl chloride resin, polyvinyl acetate resin, polyamide resin, polyacrylate ester Resin, nitrocellulose, cyclized rubber, chlorinated rubber, etc. can be used alone or as a mixture, and one or more of these can be used as organic solvents such as petroleum solvents such as toluene, ethyl acetate, methyl ethyl ketone, acetone, gasoline, etc. Dissolve and use. Alternatively, a rosin-modified phenolic resin dissolved in a drying oil (linseed oil, etc.) and a vehicle for offset printing ink dissolved in a high-boiling solvent, or SBR latex, MBR latex, vinyl acetate emulsion, acrylate emulsion, polyvinyl alcohol An aqueous binder such as a resin is used.

  Mixing the above-mentioned pearl pigment and binder, as long as the purpose of the present invention is not impaired, a dispersant, a thickener, an anti-blocking agent, an ultraviolet absorber, an organic, inorganic pigment, ultraviolet fluorescent color former, coloring A coating liquid and ink are prepared by using additives such as an agent together.

  The coating liquid for forming the pearl pigment coating layer 4 or the usage ratio of the pearl pigment and the binder in the ink increases the pearl luster feeling as the usage ratio of the pearl luster powder increases. Since the adhesive strength with 2 or 3 is insufficient, the binder is usually 50 to 500 parts by mass with respect to 100 parts by mass of the pearlescent powder in terms of dry mass.

  The pearl pigment coating layer 4 is formed on the coating layer 2 or 3 by using a coating machine or a printing machine using the coating liquid or ink thus produced. At this time, since the coating thickness and the printing thickness (both in terms of dryness) are too thin, the pearly luster is lost, and when it is too thick, the effect of improving the pearly luster becomes difficult to obtain. Preferably it is 3-10 micrometers.

  The pearl pigment coating layer 4 is a known coating machine such as an air knife coater, blade coater, gravure coater, roll coater, die coater, curtain flow coater, offset printing machine, gravure printing machine, screen printing machine or the like. It can be formed using a printing press.

  In the present invention, infrared rays are substantially absorbed on the surface of the base paper 1 and / or the surface of the coating layer 2 dissolved or swollen by a hydrophilic solvent and / or the surface of the coating layer 3 dissolved or swollen by a lipophilic solvent. It is necessary that the printing part 5 is provided.

Before describing the printed portion 5 that substantially absorbs infrared rays in detail, first, a forgery prevention technique using metamerism will be described. “Metamerism” or “metameric match” means that the same color appears perceptually depending on viewing conditions even though the spectral distribution characteristics are different (“color one point” ( Japan Color Research Institute, Japan Standards Association, 1993, Vol. 1, page 67).

  For example, in Japanese Patent No. 1331101 (Japanese Patent Publication No. 60-58711), a color that can be seen under normal light such as sunlight, fluorescent light, incandescent light bulb, and the like, or a desired spectral energy distribution is seen through a desired filter. An anti-counterfeiting technique using a metameric ink made of a colorant having a metameric property that looks like a different hue, brightness, and saturation under a light source has been proposed. When a desired pattern group is formed as a combined pattern on the paper surface with this metameric ink and a normal printing ink of the same color, for example, when it is copied with a color copier, it is the same color under normal light. A difference occurs between the colors of the two, and the product is found to be a counterfeit product. The anti-counterfeiting technology using this metamerism will be described in detail later.

  In the present invention, it is necessary that the printed portion 5 cannot be substantially visually recognized under normal light when observed from the surface of the paper. Before this description, the counterfeit using the above-described metamerism is applied. The prevention technique will be described in more detail.

  Process inks that are usually used to produce color prints are intended to reproduce all colors using the three primary colors of cyan, yellow, and magenta inks. Ink mixing indicates a so-called “subtractive color mixture”, and when the three primary colors are combined, it becomes “black”. Actually, since it does not become black as in theory, printing with an ink using carbon black called “black ink” as a colorant is usually performed. Usually, indigo ink uses phthalocyanine blue as a colorant, yellow ink uses disazo yellow as a colorant, and red ink uses Carmine 6B as a colorant.

  FIG. 7 shows the results (spectral reflectance curve) of indigo ink using phthalocyanine blue as a colorant, solid-printed on a coated paper of 46 <90> using an RI tester, and measured with a spectrophotometer.

  Fig. 8 shows the result (spectral reflectance curve) of yellow ink using disazo yellow as a colorant, solidly printed on a coated paper of 46 <90> using an RI tester, and measured with a spectrophotometer. Show.

  In addition, FIG. 9 shows a result (spectral reflectance curve) of a red ink using carmine 6B as a colorant, solidly printed on a coated paper of 46 <90> using an RI tester, and measured with a spectrophotometer. Show.

  In addition, FIG. 10 shows a result obtained by measuring with a spectrophotometer what was solidly printed on a coated paper of <90> using an RI tester using a black ink mixed with the above-mentioned indigo ink, yellow ink, and red ink ( (Dotted line) and the result (solid line) of a solid-printed paper coated with 46 <90> coated paper using black ink using carbon black as a colorant (solid line).

  As can be seen from the contrast between the spectral reflectance curves of FIG. 10, the spectral reflectance curve of the printed surface using the black ink mixed with “blue + yellow + red ink” has a reflectance of 400 to 700 nm. Is extremely low, and the reflectance rapidly increases after 700 nm. This indicates that the black ink prepared with “Indigo + Yellow + Red Ink” appears to be slightly reddish black. On the other hand, the spectral reflectance curve of the printed surface using “carbon black ink” also appears to be black, with the reflectance in the visible light region being almost the same as the reflectance of the ink mixed with “blue + yellow + red ink”. It is shown that.

  This will be described in more detail with reference to FIGS. As an example, a coating part 2 using “carbon black ink” is formed as a printing part 5 that substantially absorbs infrared rays provided on the surface of the base paper 1, and the coating layer 2 dissolves or swells with a hydrophilic solvent; As a colorant, phthalocyanine blue, disazo yellow, and carmine 6B are used in combination in the coating liquid for forming one or both of the coating layers 3 that are dissolved or swelled by the lipophilic solvent. As a method of combined use, these three kinds of colorants may be mixed in one coating liquid, or two kinds of coating liquids for forming the coating layer 2 may be mixed with one kind. You may mix and use for the coating liquid for forming. The point is that the printed portion 5 is formed of the coating layer 2 that dissolves or swells with the hydrophilic solvent and the coating layer 3 that dissolves or swells with the oleophilic solvent, and then, when observed from the surface of the paper, The coating layer 2 and the coating layer 3 may be formed by adjusting the addition amount of the colorant used in combination so that it cannot be substantially visually recognized.

  However, when observing with an apparatus that can irradiate infrared rays and visualize the reflected light, the printed portion 5 becomes visible. As shown in FIG. 10, in the infrared region, the reflectance is significantly different from the mixed ink of “carbon black” and the above-mentioned “indigo + yellow + red”. This indicates that if the human eye is structured so as to be able to detect infrared rays, they look different colors.

  In the present invention, this phenomenon is positively utilized, and it is observed with a device capable of visualizing the image by irradiating infrared rays, or both are identified by detecting a signal and used for an authenticity judgment function. To do. In the present invention, the meaning of “transmission”, “absorption” or “reflection” means that visible light or infrared light is completely transmitted (transmittance 100%) or absorbed (absorption rate 100%), or It does not mean reflection (reflectance: 100%), but means that the value may be somewhat lower if the object of the present invention can be achieved.

  FIG. 11 and FIG. 12 illustrate this specifically. FIG. 11 shows an example in which a print layer is formed with a thin print pattern on 46 <90> coated paper, and the thin print layer 5a (corresponding to the print portion 5 that substantially absorbs infrared rays) is made of carbon. It is formed with black ink, and the thin print layer 7 is formed with black ink (mixed color black ink) in which “blue + yellow + red ink” is mixed. In this printed matter, 7 and 5a appear to be the same color (black) under normal light (FIG. 11), but both have different infrared reflectances as described above, so that the image can be visualized. Using a device such as an LED emitting infrared light with a peak wavelength of 830 nm or 900 nm or a glass laser emitting infrared light with a wavelength of 1060 nm, the image is taken with a CCD camera or the like with the infrared filter removed, and a CRT When an image is displayed using an apparatus or the like that projects as an image, only the print layer 5a appears black and the print layer 7 appears to disappear as shown in FIG.

In the present invention, a primer layer can be appropriately provided on the surface of each coating layer. This layer is provided, for example, when the adhesiveness at the interface between the two coating layers is poor when the coating layer 2 and the coating layer 3 are in direct contact with each other, and the two layers work well through the primer layer. Take on. As the resin used for the primer layer, the various resins described above with reference to the binder used by mixing with the pearl pigment can be used, and the coating solution used alone or in combination is usually 0.2 to 5 g / in. Apply m ² .

Also, a plurality of coating layers 2 and 3 can be provided. When a criminal tries to peel off a label attached to the surface of an article or the like, it tries to peel it off with various liquids. Examples thereof include water, hot water, hot water, alcohols such as ethyl alcohol and propyl alcohol, petroleum organic solvents such as gasoline and kerosene, surfactants, and commercially available label removers. In many cases, the label remover is mixed with several kinds of alcohols and organic solvents. Therefore, in the present invention, as the resin used for the coating layers 2 and 3, it is necessary to select and use a resin that dissolves or swells in any of the liquids described above. In particular, the binder used in the coating layer 3 that is dissolved or swelled by the oleophilic solvent is preferably selected from a plurality of binders that can be dissolved or swelled in various organic solvents as described above, and the coating layer is preferably a plurality of layers. .

The paper of the present invention produced in this way is subjected to predetermined printing and punched into the shape of a label, and is then affixed to the surface of a predetermined article or packaging box. Affixing method is a method of affixing with water-based or organic solvent-based adhesive, a method of affixing with hot melt type adhesive, applying adhesive processing to the back of the label, peeling off the release paper or release film Adopt one of the methods such as pasting from.

FIG. 3 is an example in which a label is manufactured using the paper of the present invention, and the label is attached to the surface of the article M via an adhesive or a pressure-sensitive adhesive layer B, and a partially enlarged sectional view thereof is shown. . In this example, the printed portion 5 that substantially absorbs infrared rays is formed on the surface of the base paper 1 as shown in the figure. The printing layer 6 is appropriately formed by employing various well-known anti-counterfeit printing techniques.

FIG. 4 is a front view of an example in which a printed portion 5 that substantially absorbs infrared rays is formed on the surface of the base paper 1. Specifically, carbon black ink is used on the surface of the base paper, and a character string (6 thick Gothic body, the distance between the character string and the character string is 5 mm) is printed on a rotary offset printing press. It is an example printed with.

FIG. 5 shows a front view of another example in which a label is manufactured using the paper of the present invention. In this example, a white solid print portion W (range surrounded by a dotted line) is formed on the surface of the label using white ink, and then a printing layer 5 such as a brand name is formed. Around the white solid printing portion W, a part of the surface of the pearl pigment coating layer 4 is formed to be exposed, and the surface L of the paper is exposed.

6 shows an apparatus that irradiates the label shown in FIG. 5 with infrared rays (using an LED that emits infrared rays with a peak wavelength of 830 nm), shoots a reflected image with a CCD camera from which an infrared filter is removed, and displays the image on a CRT. It is the front view which showed a mode that the character "genuine" which was not visible under normal light when it was used and observed can be visually recognized in the pearl pigment coating layer part.

In the present invention, the solid white printed portion illustrated in FIG. 5 can be used as a thermal recording layer, and a label having a configuration in which predetermined characters and images are recorded by a thermal recording head instead of the printing layer 6 can be used.

4 and 5, the surface L of the paper is the surface on which the pearl pigment coating layer 4 is exposed. This exposed surface is excellent in pearly luster, improving the design effect, and for the reasons described above, it is difficult to forge a label with such a configuration using a color copier or the like. It is.

In particular, when the pearl pigment that expresses the interference color described above is used as the pearl pigment, the hue of the pearl pigment coating layer is changed by changing the angle at which the label is visually recognized. It is possible to determine whether or not there is an instant, and there is an advantage that a design effect is enhanced.

The label is usually manufactured as follows. First, the paper of the present invention having the above-described configuration is prepared. An adhesive or pressure-sensitive adhesive layer B is formed on the back surface of the paper according to a conventional method, and when a pressure-sensitive adhesive is used, a release paper or a release film is attached to the pressure-sensitive adhesive surface. The adhesive may be applied when the label is manufactured and finally applied to the surface of an article or the like.

A predetermined printing layer 6 is provided on the surface (pearl pigment coating layer side), and then punched to a predetermined label size using a Thomson punching blade or the like. Alternatively, the blade is inserted to the surface of the release paper or release film or a little from the surface, and other unnecessary portions are removed while leaving a necessary portion as a label.

At this time, it is possible to make a cut in the label at any time. This technique is a well-known technique, and if the label attached to the surface of the article is peeled off by any means, the label acts to break. If the label can be easily peeled off, the label is peeled off and affixed to the surface of a counterfeited article, which makes it easier for a crime to appear as if the article is authentic. Many labels are used for this purpose.

Although an Example is given below, both a mass part and the mass% mean the value of solid content conversion.
[Example 1]
<Manufacture of base paper>
50 parts by weight of softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP)
50 parts by weight of 400 ml C.I. S. F. 1 part by weight of a modified rosin sizing agent (trade name “Size Pine N-771”, manufactured by Arakawa Chemical Co., Ltd.), a wet paper strength enhancer. A paper stock was prepared by adding 0.5% by mass (trade name “WS-547”, manufactured by Japan PMC Co., Ltd.) and 4% by mass of a sulfuric acid band. Using this stock, a base paper having a basis weight of 90 g / m ² was produced in a conventional manner with a long paper machine.

Next, 50 parts by weight of kaolin (trade name “UW90”, manufactured by Engelhard Co., Ltd.), 50 parts by weight of calcium carbonate (trade name “Kallite-KT”, manufactured by Shiraishi Kogyo Co., Ltd.), 0.3 parts by weight of a dispersant A white pigment coating solution comprising 6 parts by mass of oxidized starch (manufactured by Nippon Star Chemical Co., Ltd.) as a binder and 15 parts by mass of an acrylic emulsion (trade name “Nipol LX-852B”, manufactured by Nippon Zeon Co., Ltd.) An air knife coater was used to provide 15 g / m ² , followed by supercalender treatment. The smoothness (Beck smoothness specified in JIS 8119) on the white pigment coating layer side was measured and found to be 290 seconds.

<Formation of printed part that substantially absorbs infrared rays>
A character string in which “genuine geneuine” is continuous using carbon black ink on the surface of the above base paper (white pigment coating layer side) (thick Gothic 6 points, spacing between character strings is 5 mm) Was printed on an offset rotary printing press (see FIG. 4).

<Formation of coating layer dissolved or swollen by hydrophilic solvent>
Subsequently, a modified polyvinyl alcohol coating layer was provided on the entire surface of the surface using a 5.0 g / m ² air knife coater as a coating layer dissolved or swollen by a hydrophilic solvent.

<Formation of coating layer dissolved or swollen by lipophilic solvent>
Next, 100 parts by mass of polycarbonate resin, disazo yellow, phthalocyanine blue, and carmine 6B are coated on the surface of the coating layer dissolved or swollen by the hydrophilic solvent provided on the surface, as a coating layer dissolved or swollen by the lipophilic solvent. A coating liquid consisting of 25 parts by mass of mixed black powder and 250 parts by mass of ethyl acetate was provided at 5.0 g / m ² using a gravure coater.

<Formation of pearl pigment coating layer>
Next, on this surface, a coating liquid comprising 100 parts by weight of a pearl pigment (particle size 40 μm, mica powder having a titanium oxide coverage of 28%), 100 parts by weight of an acrylic emulsion, 10 parts by weight of phosphorylated starch, and an appropriate amount of water, An air knife coater was used to provide 7.0 g / m ² .

[Example 2]
A paper having self-other discriminating ability was manufactured in the same manner as in Example 2 except that the pearl pigment coating layer was changed to the following.
<Formation of pearl pigment coating layer>
An aqueous coating liquid having a concentration of 20% by mass comprising 80 parts by mass of a pearl pigment (trade name “Iriodin 215”, manufactured by Merck Japan Ltd.) and 20 parts by mass of a polyacrylate emulsion, which emits a red iris color. Using a coater, 5 g / m ^{2 was} applied in dry mass to obtain a pearl pigment coating layer.

<Example of formation of adhesive layer>
A pressure-sensitive adhesive layer (strong adhesion type) is formed on the release paper on which the polyethylene is melt-extruded and coated on the surface of the kraft paper, and then a silicone-based release agent is applied. The obtained paper was stuck so that the back surface was in contact.

<Formation of printing layer>
Next, as shown in FIG. 5, a white solid print portion W (range surrounded by a dotted line) was formed on the surface using white ink, and then a printing layer 5 such as a brand name was formed. Around the white solid printed portion W, a part of the surface of the pearl pigment coating layer was formed to be exposed, and the surface of the paper was exposed.

<Punching of labels>
Next, the label shown in FIG. 5 was punched using a Thomson punching blade. (Hereinafter, the label manufactured using the paper of Example 1 is referred to as the label of Manufacturing Example 1, and the label manufactured using the paper of Example 2 is referred to as the label of Manufacturing Example 2.)

<Paste the label on the packaging box>
The labels of Production Example 1 and Production Example 2 were affixed to the surface of a packaging box of a commercially available ink cartridge for an inkjet printer that had been subjected to predetermined printing using white paperboard.

<Label peeling test and results>
Attempts were made to remove the label with the nail, but the adhesive layer was firmly adhered to the packaging box in both the labels of Production Example 1 and Production Example 2, and could not be removed. The label was destroyed when trying to force it off.

<Observation by infrared rays>
The label was irradiated with an LED emitting infrared light having a peak wavelength of 830 nm, photographed with a CCD camera or the like from which an infrared filter was removed, and displayed as an image on a CRT. As shown in FIG. 6, the characters “genuine” that could not be visually recognized under visible light could be clearly recognized.

  The paper having self-other discriminating ability according to the present invention may be any article that is desired to be self-identified, such as a packaging box for jewelry, a wristwatch packaging box, a bottle of liquor such as whiskey or brandy, and a packaging for ink cartridges for inkjet printers. It can be suitably used for labels, tags and the like attached to the surfaces of boxes, cosmetic packaging boxes, pharmaceutical packaging boxes, CD and DVD packages, and the like.

It is a partially expanded sectional view of an example of the sheet | seat which has the self-other discriminating ability by this invention. It is a partial expanded sectional view of other examples of the paper which has self-other discriminating ability by this invention. FIG. 3 is a partially enlarged cross-sectional view of an example in which a label is manufactured using the paper of the present invention, and the label is attached to an article M via an adhesive or pressure-sensitive adhesive layer B. 2 is a front view of an example in which a printed portion 5 that substantially absorbs infrared rays is formed on the surface of a base paper 1. FIG. It is a front view of the other example which manufactured the label using the paper of this invention. It is the schematic diagram which expanded a part of image which irradiated the infrared rays to the label shown in FIG. 5, and image | photographed the reflected image with the CCD camera which removed the infrared filter. The result (spectral reflectivity curve) of indigo ink printed on a solid <90> coated paper using an RI tester and measured with a spectrophotometer is shown. The result (spectral reflectance curve) of yellow ink, solidly printed on 46 <90> coated paper using an RI tester, and measured with a spectrophotometer is shown. The results (spectral reflectance curve) of the red ink, which was solid-printed on a coated paper of <46> <90> using an RI tester, and measured with a spectrophotometer are shown. A black ink mixed with indigo ink, yellow ink, and red ink, printed on a solid <90> coated paper using an RI tester, measured with a spectrophotometer, and carbon black as a coloring material. The result of having measured the thing solid-printed on the coated paper of 46 <90> using the used black ink with the spectrophotometer is shown. This is an example in which a print layer is formed with a fine pattern on a forty-six <90> coated paper. It is the image which irradiated infrared rays to the printed matter of FIG. 11, and visualized it.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base paper 2 Coating layer which melt | dissolves or swells with hydrophilic solvent 3 Coating layer which melt | dissolves or swells with lipophilic solvent 4 Pearl pigment coating layer 5 Print part which substantially absorbs infrared rays 5a Absorbs infrared rays substantially Fine print layer 6 Print layer 7 Fine print layer formed with mixed black ink B Adhesive or adhesive layer M Article L Label paper surface W White solid print part

Claims (4)

  On the surface of the base paper (1), a coating layer (2) that dissolves or swells with a hydrophilic solvent, a coating layer (3) that dissolves or swells with a lipophilic solvent, and a pearl pigment coating layer (4) are sequentially provided. The coating layer (4), the coating layer (3) and the coating layer (2) all have a property of substantially transmitting infrared rays, and the coating layer (2) and / or Printed portion in which the coating layer (3) is colored and substantially absorbs infrared rays on the surface of the base paper (1) and / or the coating layer (2) and / or the surface of the coating layer (3) (5) is provided, and the printed portion (5) cannot be visually recognized under normal light when observed from the surface of the paper, and has a self-other discriminating ability. .   A coating layer (3) that dissolves or swells with a lipophilic solvent, a coating layer (2) that dissolves or swells with a hydrophilic solvent, and a pearl pigment coating layer (4) are sequentially provided on the surface of the base paper (1). The coating layer (4), the coating layer (2) and the coating layer (3) all have a property of substantially transmitting infrared rays, and the coating layer (3) and / or A printing portion in which the coating layer (2) is colored and substantially absorbs infrared rays on the surface of the base paper (1) and / or the coating layer (3) and / or the surface of the coating layer (2). (5) is provided, and the printed portion (5) cannot be visually recognized under normal light when observed from the surface of the paper, and has a self-other discriminating ability. .   The base paper (1) is a multilayer laminated paper, and at least one of the paper layers is lower than the paper interlayer strength of the other paper layers. Paper with the ability to identify yourself and others. The paper having self-other discrimination ability according to any one of claims 1 to 3, wherein the pearl pigment coating layer (4) is a pearl pigment coating layer having optical interference.

Images