JP2012024938A - Information forming sheet - Google Patents

Abstract

The present invention relates to an information forming sheet on which watermark information is formed, and optimizes the watermark effect by the watermark information for thick paper.
An ultraviolet curable printing ink obtained by mixing watermark information 15 on a back surface 12B of a paper substrate 12 and a white ink containing a white pigment of titanium dioxide and a colored ink containing a color pigment other than paper color. The watermark information 15 is visually recognized when light is watermarked from the front surface 12A side of the paper base 12.
[Selection] Figure 1

Description

  The present invention relates to an information forming sheet on which watermark information is formed.

  In recent years, as a representative information forming sheet, an insurance certificate or a voucher certificate document in which watermark information for preventing forgery is formed is known. For these certificates, cardboard is mainly used, and it is desired to form watermark information that optimizes the watermark effect.

  Conventionally, as a sheet on which a watermark is formed, there is a form sheet as shown in Patent Document 1. This watermarked form paper is formed by partially printing a paper-colored light-shielding ink made of an ultraviolet curable paper-color ink containing titanium oxide as a white pigment on the paper surface to form a watermark.

Japanese Patent No. 3444535

  However, the form paper of Patent Document 1 has a problem that the watermark effect particularly from the opposite side of the printing surface decreases as the paper thickness of the paper used increases because the shading ink is paper color. For example, in the case of a paper having a paper thickness of 90 μm or more, the watermark effect was not obtained.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide an information forming sheet that optimizes a watermark effect for thick paper.

  In order to solve the above-mentioned problem, in the invention of claim 1, there is provided an information forming sheet in which unique information is printed on the front surface of a paper base material and watermark information is printed on a predetermined portion of the back surface. The ink is formed with an ultraviolet curable printing ink in which a colored ink other than paper color is mixed with ink, and the watermark information is visually recognized when the ink is watermarked from the surface side.

  According to the present invention, the watermark information is formed on the back surface of the paper base material by the ultraviolet curable printing ink in which the color ink other than the paper color is mixed with the white ink. By making the watermark information visible at the time, the watermark effect by the watermark information can be optimized for thick paper.

It is a block diagram of the information forming sheet which concerns on this invention. It is manufacture explanatory drawing of the information formation sheet of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration diagram of an information forming sheet according to the present invention. 1A is a perspective view of the information forming sheet, and FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A. FIG. 1B shows dimensions and the like for easy configuration. Ignored and shown. In FIGS. 1A and 1B, the information forming sheet 11 is a sheet on which the ground pattern 13 is formed on the entire surface 12A of the paper base 12, for example. The paper base 12 is 120 kg / m ² and has a thickness of about 180 μm.

  Further, in the present embodiment, the paper base material 12 is a thin beige color as a whole, and a paper base pattern 12 printed by a thin orange color is used. The copy-forgery-inhibited pattern 13 may be applied on one surface or both surfaces serving as the front surface and the back surface, or may be applied to the entire surface or a predetermined portion.

  Sheet-specific unique information 14 is formed in a color different from the paper color on the tint block 13 applied to the surface 12A of the paper base 12. In addition, watermark information (for example, a letter “A”) 15 is formed at a predetermined position on the back surface 12 </ b> B of the paper substrate 12 with ultraviolet curable printing ink. The watermark information 15 has all forms such as a design, a pattern, a character, and a figure.

  Here, the ultraviolet curable printing ink for printing the watermark information 15 is, for example, a mixture of white ink and colored ink other than paper color, for example, black ink. Specifically, it contains 400 g (40%) of a white pigment of titanium dioxide as a white ink with a total weight of 1 kg (the rest is the amount of a general ultraviolet curable resin), and as a black ink with a total weight of 2 g. This is one containing 0.3 g (15%) of a black pigment of a colored pigment carbon black (the rest being the amount of a general ultraviolet curable resin). The pigment ratio in the entire printing ink is 0.075% of black pigment with respect to 100% of white pigment. When the white ink contains 3 g of black ink (black pigment content: 15%) with respect to the thickness (approximately 180 μm) of the laminated cardboard body of the paper base 12 and the second paper piece 13. The watermark effect by the watermark information 15 was not satisfactory.

  As white pigments, zinc white, lead white, lithopone, titanium dioxide, precipitated barium sulfate and barite powder are known, but titanium dioxide is preferred in consideration of light transmittance. Color pigments include black pigments (carbon black), red pigments (red lead, iron oxide red), yellow pigments (yellow lead, zinc yellow (zinc yellow 1 type, zinc yellow 2 type)), blue pigments ( Ultramarine blue, Prussian blue (potassium ferrocyanide)) and the like are selected as appropriate according to the paper color. In addition, an organic pigment, an inorganic pigment, etc. are not ask | required as a pigment.

  FIG. 2 is an explanatory diagram for manufacturing the information forming sheet of FIG. First, as shown in FIG. 2A, a continuous sheet 21 is used in which a sheet of paper base material 12 having a ground pattern 13 formed on the entire surface 12A is continuously provided by a cut line 22. As shown in FIG. 2 (B), the specific information 14 is printed in a color other than paper color (light beige) (for example, black of carbon black) on a predetermined portion on the ground pattern 13 on the surface 12A of the continuous sheet 21. The ink is printed by general offset printing, screen printing, or ink jet printing.

  After the printing of the unique information is fixed (thermal fixing), as shown in FIG. 2 (C), watermark information (in the above-described ultraviolet curable printing ink is used for a predetermined portion of the back surface 12B of the continuous sheet 21. “A”) 15 is printed by offset printing, screen printing, ink jet printing, or the like here, with a normal thickness of 1 μm, and is cured and fixed by ultraviolet irradiation.

  Then, as shown in FIG. 2D, the continuous sheet 21 is cut along the cut line 22 to form the single-wafer information forming sheet 11 shown in FIG. The information forming sheet 11 normally cannot visually recognize the watermark information 15 from the surface 12A side on which the unique information 14 of the paper base material 12 is formed, and the watermark information 15 is visually recognized when watermarked with light. It is what is done.

  In FIG. 2, the process of printing the watermark information 15 after printing the unique information 14 is shown, but the order is not defined, and any of them may be printed first.

  In this way, watermark information is formed by ultraviolet curable printing ink in which colored ink other than paper color is mixed with white ink in a predetermined part on the back side of the paper base material, so that at least about 180 μm thick cardboard Thus, the watermark effect by the watermark information can be optimized. In particular, an optimal watermark effect can be obtained with a paper thickness of at least 90 μm to 180 μm for the above-described form paper with watermark information disclosed in Patent Document 1.

  The watermark information 15 formed on the information forming sheet 11 is extremely difficult to counterfeit due to the copy-forgery-inhibited pattern 13, and is difficult to recognize even with a copying machine or the like, and has an effect of preventing counterfeiting. On the other hand, from the viewpoint of authenticity determination, mechanical authenticity determination can be made possible by including a member that reacts with a specific wavelength in the ultraviolet curable printing ink.

  The information forming sheet of the present invention can be used for various tickets, cash vouchers, receipts and the like in addition to various certificates.

11 Information Forming Sheet 12 Paper Base Material 13 Background Pattern 14 Unique Information 15 Watermark Information 21 Continuous Sheet 22 Cut Line

Claims (1)

An information forming sheet in which unique information is printed on the front surface of the paper substrate, and watermark information is printed on a predetermined portion of the back surface,
The watermark information is formed by ultraviolet curing printing ink in which colored ink other than paper color is mixed with white ink, and the watermark information is made visible when the watermark is watermarked from the surface side. Sheet.

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