JPH0316779A - Concealed printing and duplication slip using the same method - Google Patents

Abstract

PURPOSE:To enable printed descriptions to be read in visible form whenever required excepting a normal state when the descriptions cannot be read by performing a latent image using a coloring agent and developing it in contact with a developer which reacts with the agent whenever necessary. CONSTITUTION:Paper 1 consists of a coloring agent capsule layer 2 of a coloring agent-containing microcapsule formed on the surface. A latent image 2a of specified descriptions is formed by breaking the microcapsule of the coloring agent capsule layer 2 upon application of printing pressure or writing-stroke pressure on the paper 1. The descriptions cannot be read in this condition as the coloring agent has not yet reached. A solution containing a developer such as acidic clay which develops colors in reaction with the coloring agent of the coloring agent capsule layer 2 is allowed to come in contact with the coloring agent whenever required. Consequently, the latent image 2a develops to a visible image 2b and concealed information can be read.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a method of destroying a color former capsule layer to form a latent image of confidential information, and then spraying a liquid containing a color developer when necessary. The present invention relates to a secret printing method in which the latent image is developed using a secrecy printing method, and a copy slip using such a secret printing method. [Prior Art] First, copy slips used in automated teller machines (ATMs) and the like will be explained. Figures 10 to 12 are diagrams showing conventional examples of copy slips. The copying slip 20 is made up of two sheets, an upper slip 2l and a lower slip 25, and the items written on the upper slip 21 are copied onto the lower slip 25 using the reverse carbon or carbonless method (Fig. 10). ). The upper slip 2l is a slip for the issuer, such as a bank or a device custodian, and is provided with a large number of punch holes 22 on both sides along the longitudinal direction. In addition, the upper slip 2l is sewn with a sewing machine lIli! at regular intervals in the transverse direction. There are 23 sewing machines next to each other! Each unit slip formed between I23 has a writing field 24 printed thereon in which predetermined items are printed (FIG. 11). On the other hand, the lower slip 25 is a copy of the transaction slip, and is the same in shape and size as the upper slip 2l. Sewing machine 11112 3. Record! ! In addition to the same column 24, etc., various information for traders is printed (Figure 12). Such a copy slip 20 is loaded as a continuous slip into a predetermined location of an automatic cash transaction device, and predetermined items are printed on it by a built-in printer. Normally, only printing pressure is applied from the upper slip 21 to the lower slip 25 using a printer head or the like, and at the same time as predetermined information is recorded on the upper slip 21, the same information is copied onto the lower slip 25.
Thereafter, the upper slip 2l is rolled up and stored within the device as a copy on the issuer's side, and the lower slip 25 is given to the transaction party as a copy. However, among the items printed on the copy slip 20,
Contains information that could be misused if known by someone other than the transaction person, or information that should be kept from others. For example, the balance of deposits falls under such information. For this reason, conventionally, such information is likely to be leaked by entering the balance amount on the upper slip 2l.
The secrecy of the information was maintained by applying concealment printing such as a solid pattern or background pattern to the 4a (Fig. 11) so that even if it was printed on top of it, it could not be read. [Problem to be Solved by the Invention] However, with the above-mentioned conventional copy slip, if some trouble occurs and it becomes necessary to read the entry of the balance balance from the issuer's copy, the corresponding entry can be read from the issuer's copy. iI!
Since the column 24a is hidden and printed, the necessary information cannot be read immediately, and it takes time and effort to find out the information. An object of the present invention is to provide a secret printing method in which printed matters that cannot be read under normal conditions can be exposed and read when necessary. Another object of the present invention is to provide a copy slip on which predetermined items can be secretly printed using such a secret printing method. [Means for Solving the Problems] In order to solve the above problems, the concealed printing method according to the present invention applies pressure to paper on which a color former capsule layer formed of microcapsules containing a color former is formed on the surface. After the microcapsules are destroyed to form a latent image, the latent image is developed by bringing into contact with a color developer that reacts with the color former to form a color when necessary. In addition, the copy slip using the secret printing method according to the present invention has an upper slip in which a color former capsule layer made of microcapsules containing a color former is formed on a part or all of the upper surface and lower surface, and a lower surface of the upper slip. A color developer layer that develops color by reacting with the color former is formed in a portion facing the formed color former capsule layer, and the transfer mold develops color with the color former and transfers to the upper slip side. It consists of a lower slip formed by laminating a color developer layer at a predetermined location, and by applying pressure from the upper surface of the upper slip or the lower surface of the lower slip, confidential information is printed on the upper surface of the lower slip. and forming a developed image of non-confidential information, forming a developed image of part or all of the non-confidential information on the lower surface of the upper slip, forming a latent image of confidential information on the upper surface of the upper slip, and forming a latent image of confidential information on the upper surface of the upper slip. The latent image of the confidential information is developed by contacting the top surface of the upper slip with a color developer that develops color by reacting with the color former. [Example] The present invention will be described in detail below with reference to the drawings and the like. FIGS. 1 to 3 are schematic diagrams for explaining an embodiment of the secret printing method according to the present invention. A color former capsule layer 2 made of microcapsules encapsulating a color former is formed on the surface of the paper l. This microcapsule can be manufactured, for example, as shown below. Diisoprobylnaphthalene 9
5 parts by weight, 3.5 parts by weight of crystal violet lactone, and 15 parts by weight of penzoyl leucomethylene blue. To 50 parts by weight of the obtained composition, unsaturated polyester resin (HA-100 manufactured by Nippon Reichhold) was added.
) and 0.1 part by weight of azodiisobutyronitrile and melt. Further, the melt was dispersed in a 5% aqueous solution of gum arabic at 20°C to form an O/W emulsion. When the particle size of the oil droplets reaches approximately 5 μm, the oil droplets are heated to approximately 90°C with stirring and kept at this temperature for 3 hours to form a microcapsule dispersion containing organic pigments and materials with a particle size of approximately 5 μm. Then, microcapsule borders are produced from this dispersion by a spray drying method. The ink for the color former capsule layer was prepared using the microcapsule powder produced in this way, using a Hewei resin binder, an IIR agent, etc., and applied to the capsule layer by a method such as gravure printing or flexographic printing. After that, let it dry. Pressure such as printing pressure or pen pressure is applied to this paper l to destroy the microcapsules of the color former capsule layer 2 and form a latent image 2a of a predetermined item. In this state, the coloring agent has not reacted, so the written information cannot be read. When necessary, a solution (Mitsubishi N
When a capsule checker for CR (manufactured by Mitsubishi Paper Mills ■, etc.) is brought into contact with the latent image 2a, the latent image 2a develops color and becomes the current image 12b, allowing the confidential information to be read. The method of bringing the solution containing the color developer 3 into contact may be by spraying, applying by an appropriate method, or stacking papers impregnated with such a solution and pressing with a roller or the like. ．． FIG. 4 is a schematic diagram showing an embodiment of a copy slip using the secret printing method according to the present invention, and FIGS. 5 to 9 are diagrams for explaining the handling operation of the slip of the same embodiment. The copy slip 4 of this embodiment is approximately the same in appearance as the conventional copy slip 20 described above. The copy slip 4 is a combination of the upper slip 5 and the lower slip 8. On the upper and lower surfaces of the upper slip 5, a coloring agent capsule layer 6.7 is formed at least within the range of the required information NIMA. The lower slip 8 is arranged so as to be in contact with the lower surface of the upper slip 5, and at least the upper surface of the lower slip 8 is marked! ! ! A color developer layer 9 that reacts with the color former of the color former capsule layer 7 to form a color is formed within the range of the field. In the area where items such as the date and management number are entered,
A transfer type developer layer 10 is formed. This transfer type color developer N10 is of a type that reacts with the color former in the color former capsule layer 7 and is transferred to the color former capsule layer 7 side by breaking the capsule with pressure such as printing pressure. Next, the handling operation of the copy slip 4 according to the present invention will be explained. The duplicate slips 4 assembled as shown in FIG. 4 are loaded into an automated teller machine or the like in a continuous state and printed by a built-in printer. At this time, as shown in Figure 5,
The printing pressure of the printer destroys the microcapsules of the coloring agent capsule layer 6 on the upper surface of the upper slip 5, forming a latent image 6a of both confidential information and non-confidential information.
On the other hand, the color developer capsule layer 7 on the lower surface of the upper slip 5 is also destroyed at the same location, and reacts to the color developer layer 9 of the lower slip 8, causing the lower slip 8 to contain both confidential information and non-confidential information. Development 9
a appears. At this time, the developer 10a transferred to the lower surface of the upper slip 5 appears in the area where the transfer type developer layer 1O is formed where the items to be searched are printed (see FIGS. 5 and 7). ．． In this state, the upper slip 5 is rolled up in the device as a continuous slip and kept as a copy on the issuer's side. On the other hand, the lower slip 8 is ejected from the device, torn from the thin wire, and handed to the transaction person. Suppose now that it becomes necessary to read confidential information from the upper slip 5, which serves as a copy. In this case, the corresponding slip can be retrieved using the development 10a of search items such as date and management number transcribed on the bottom surface of the upper slip 5. After taking out the corresponding slip, write the following on the top of the upper slip 5.
A liquid containing the color developer 11 is sprayed using a sprayer or the like (see Fig. 8). On the upper surface of the upper slip 5, printing pressure is applied due to printing, and the portion where the microcapsules are destroyed becomes a latent image 6.
Since the color forming agent remaining there reacts with the sprayed color developer 11, a developed image 6b appears (see Fig. 6 and Fig. 9). All information, including confidential information, appears on the top of the upper slip 5 (see Figure 8), which was previously invisible to the public, and the necessary information can now be read (see Figure 9).
(see figure). Please note that if you print the information necessary for the search from the bottom, it will not be written on the other side. (Effects of the Invention) As explained above, according to the secret printing method of the present invention,
A latent image is formed using a coloring agent, and when necessary, it is developed by contacting it with a color developer that reacts with it, so confidential information can be easily recorded and read without the need for any special equipment. It can be read easily and quickly when the need arises. Furthermore, according to the copy slip using the secret printing method according to the present invention, in addition to the above-mentioned effects, the non-confidential information necessary for searching etc. is transferred to the lower surface of the upper slip and printed as a developed image. You can easily search for documents.

[Brief explanation of drawings]

1 to 3 are schematic diagrams for explaining an embodiment of the secret printing method according to the present invention. FIG. 4 is a schematic diagram showing an embodiment of a copy slip using the secret printing method according to the present invention, and FIGS. 5 to 9 are diagrams for explaining the handling operation of the slip of the same embodiment. Figures 10 to 12 are diagrams showing conventional examples of copy slips. 1... River paper 2... Color former capsule layer 3... Color developer 4... Copy slip 5... Upper slip 6.7.
・・Coloring agent capsule layer

Claims (2)

[Claims] (1) After applying pressure to the paper on which a color former capsule layer formed of microcapsules encapsulating a color former is formed to destroy the microcapsules and form a latent image, the color former is added to the paper when necessary. A concealed printing method configured to develop the latent image by bringing it into contact with a color developer that develops color by reaction. (2) An upper slip in which a color former capsule layer made of microcapsules encapsulating a color former is formed on part or all of the upper and lower surfaces, and a portion facing the color former capsule layer formed on the lower surface of the upper slip. A color developer layer is formed that reacts with the color former to develop a color, and a transfer type color developer layer that develops color with the color former and transfers to the upper slip side is laminated at a predetermined location. By applying pressure from the upper surface of the upper slip or the lower surface of the lower slip, confidential information and non-confidential information are formed on the upper surface of the lower slip. A developed image of part or all of the non-confidential information is formed on the bottom surface of the slip, a latent image of the confidential information is formed on the top surface of the upper slip, and when necessary, a latent image of the confidential information is formed on the top surface of the upper slip to react with the coloring agent. A copy slip using a secret printing method configured to develop a latent image of the secret information by contacting it with a color developer that develops color.