National Printing Bureau of Japan

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National Printing Bureau of Japan

Japan
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Ozaki Y.,National Printing Bureau of Japan
Journal of Adhesion Science and Technology | Year: 2010

Many kinds of adhesives are used to produce paper and prints. However, it is difficult to observe the distribution of these adhesives in situ because most are transparent and of low content. We have developed a fluorescence staining technique, which observes adhesives in paper with a confocal laser scanning microscope (CLSM) after staining with specific fluorescent dyes. In this review, we present our observations using this technique on a wet strength resin in paper, the vehicle of offset printing ink on uncoated paper, and the coating binder in coated paper. The polyamide epichlorohydrin (PAE) resin, a wet strength resin, was selectively stained with Sulforhodamine 101 acid chloride, while the pulp fibers were stained with Acridine Orange. The distribution of PAE could be observed in a CLSM fluorescence image at the excitation wavelength of 543 nm, and the pulp fibers could be observed in a fluorescence image at the excitation wavelength of 473 nm. From this it was found that PAE tends to concentrate at fiber crossings. In order to quantify the penetration of the ink vehicle into the base paper sheet, cyan offset inks stained with Rhodamine B were printed on various paper samples. The location of the vehicle was determined with CLSM. The penetration of the ink vehicle was observed in three-dimensional images. Coated papers were soaked in a solution of Rhodamine B in ethanol, and then they were rinsed with pure ethanol. The styrene-butadiene latex of the coating binder was selectively stained with Rhodamine B. The distribution and position of latex in the coating layer was characterized with CLSM. © 2010 Koninklijke Brill NV, Leiden.


Hayashi T.,National Printing Bureau of Japan | Thornton P.D.,University of Leeds
Dyes and Pigments | Year: 2015

C. I. Disperse Red 1 (DR1) was chemically modified by a facile, one-step, Steglich esterification to yield the thiol-bearing analogue. The dye produced possesses the appropriate functionality to be readily incorporated into appropriate materials by highly effective thiol-ene 'click' chemistry reactions. This method of dye modification greatly widens the application range of hydroxyl-bearing reactive dyes for various materials, enabling the facile production of coloured materials by using the thiol groups added. © 2015 Elsevier Ltd. All rights reserved.


Patent
National Printing Bureau of Japan | Date: 2016-03-02

An anti-counterfeit printed matter which forms an invisible image that can be visualized clearly to prevent a visible image from impeding visibility of a visualized invisible image. A plurality of object elements are arranged at a predetermined pitch in a matrix, each object element including a first object and a second object arranged along a first direction on both sides of a boundary at a center to oppose each other, and a third object and a fourth object arranged along a second direction perpendicular to the first direction on both sides of a boundary at the center to oppose each other. The first object and the second object, and the third object and the fourth object of each object element have a negative/positive relationship. The first object and/or the second object form a first invisible image. The third object and/or the fourth object form a second invisible image.


Patent
National Printing Bureau of Japan | Date: 2012-06-06

This invention provides a latent image pattern formed body that allows to observe a latent image having excellent visibility and authenticity discrimination and design properties than those of related arts when observed from the oblique direction. The latent image pattern formed body includes, in at least part of one surface of a substrate, a latent image region, an outline region arranged on an outline of at least part of the latent image region, and a background region arranged on a background of the latent image region and the outline region. In the latent image region, a plurality of first elements having a concave or convex shape are arranged at a first pitch in a first direction. In the background region, the plurality of first elements are arranged at the first pitch in the first direction in a phase different from that of the first elements in the latent image region. In the outline region, the plurality of first elements are arranged at the first pitch in the first direction in a phase different from that of the first elements in the latent image region or background region adjacent to the outline region. In the latent image region, the background region, and the outline region, a plurality of second elements having a color different from that of the substrate are arranged at a second pitch in a second direction.


Patent
National Printing Bureau of Japan | Date: 2014-08-20

This invention relates to a printed matter which visualizes a latent image pattern by periodically formed raised image lines when observed in a tilted state, and provides an anti-counterfeit printed matter which allows latent images having different densities to be observed from a plurality of observation angles. In the anti-counterfeit printed matter, a region serving as a shade of a latent image is formed in addition to image lines forming a latent image portion and those forming a background portion, or at least one of the latent image portion, the background portion, and the shade portion is divided into a plurality of regions, and image lines formed in the divided regions are arranged at different angles, thereby forming a three-dimensional latent image observed from a plurality of directions.


Patent
National Printing Bureau of Japan | Date: 2012-08-22

There is provided an intaglio printing ink that causes little set-off, exhibits improved chalking resistance, and attains improved print quality, and which permits low-cost prevention of blocking by low-dose irradiation with ultraviolet light. The intaglio printing ink comprises at least an ultraviolet curable composition, an oxidation polymerizable composition, a photopolymerization initiator, an oxidation polymerization catalyst, and a pigment. An acid-modified epoxy-acrylate prepared by reacting a polybasic acid anhydride with an epoxy-acrylate obtained by reacting an acrylate, having two or more acryloyl groups and one carboxyl group in one molecule, with an epoxy compound, having two or more epoxy rings in one molecule, is used as the ultraviolet curable composition.


Patent
National Printing Bureau of Japan | Date: 2012-08-29

This invention relates to a printed matter which visualizes a latent image pattern by periodically formed raised image lines when observed in a tilted state, and provides an anti-counterfeit printed matter which allows latent images having different densities to be observed from a plurality of observation angles. In the anti-counterfeit printed matter, a region serving as a shade of a latent image is formed in addition to image lines forming a latent image portion and those forming a background portion, or at least one of the latent image portion, the background portion, and the shade portion is divided into a plurality of regions, and image lines formed in the divided regions are arranged at different angles, thereby forming a three-dimensional latent image observed from a plurality of directions.


Patent
National Printing Bureau of Japan | Date: 2010-06-02

This invention provides an anti-counterfeit printed matter which forms an invisible image that can be visualized clearly and also prevents a visible image from impeding visibility of a visualized invisible image. In the anti-counterfeit printed matter according to this invention, a plurality of object elements are arranged at a predetermined pitch in a matrix, each object element including a first object and a second object which are arranged along a first direction on both sides of a boundary at a center so as to oppose each other, and a third object and a fourth object which are arranged along a second direction perpendicular to the first direction on both sides of a boundary at the center so as to oppose each other. The first object and the second object, and the third object and the fourth object of each object element have a negative/positive relationship. The first object and/or the second object forms a first invisible image. The third object and/or the fourth object forms a second invisible image.


This invention relates to an anti-counterfeit printed matter such as a banknote or a passport which requires anti-counterfeit or anti-copy, a method of manufacturing the same, and a recording medium storing halftone dot data creation software. Units are arranged at a predetermined pitch in a matrix on a base material in a first direction and a second direction perpendicular to the first direction, each unit including a first object and a second object which are arranged along the first direction on both sides of a center so as to oppose each other and a third object arranged in a region without the first object and the second object, the first object and the second object of each of the units have an on/off relationship and the same area, the first objects form one of a positive image and a negative image of a first invisible image, and the second objects form the other of the negative image and the positive image of the first invisible image, and the third objects form a visible image having a continuous tone.


Patent
National Printing Bureau of Japan | Date: 2011-07-13

This invention relates to an anti-counterfeit printed matter, including securities such as banknotes, stock certificates, and bonds, various kinds of certificates, and important documents, which requires anti-counterfeit or anti-copy. [Solving Means] A visible image is formed by a first object group arrayed in a first direction at a predetermined pitch and a second object group arranged in the non-imaging area of the first object group. The second object group forms the negative and positive images of a first invisible image by arbitrarily arranging two kinds of objects in pairs in the on/off relationship. Addition, in the anti-counterfeit printed matter, the first object group includes object portions that are formed in at least two height levels from the surface of the printed matter so as to have a predetermined difference in height, thereby forming a second invisible image.

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