JP2018034466A - Print having latent image intaglio printing pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forgery prevention technique using convex streaks depending on observation angles, excellent in designability and a profound feeling, e.g., in a colored figure pattern by intaglio printing and requiring no dense streak engineering for convex streak height, width or the like, e.g., in the conventional latent image pattern.SOLUTION: The print has an intaglio printing pattern region including a concave-shaped streak group in which concave-shaped streaks isochromatic to a base material are numerously arranged and an intaglio printing streak group in which convex intaglio printing streaks with color different from the concave intaglio printing streaks are plurally arranged. In the concave streak group, bottom parts, side parts and peak parts are regularly arranged, the concave streak group and the intaglio printing streak group are laminated in such a manner that a part of the intaglio printing streaks has a plurality of crossed intersections on the peak parts, intaglio printing ink forming the intaglio printing streak is stuck to the side parts or the side parts and the bottom part of the concave streak adjacent to the intersection in the intaglio printing streaks, the same has an overflowing part thicker than the streak width of the intaglio printing streak crossed to the peak part.SELECTED DRAWING: Figure 3

Description

  In the fields of banknotes, passports, securities, identification cards, cards, passports, etc., which are security prints that require anti-counterfeiting effects, the present invention provides intaglio lines on uneven substrates. The present invention relates to a printed matter in which a latent image pattern can be visually recognized with a change in observation angle by utilizing an overflow phenomenon of intaglio ink generated by printing.

  Intaglio printing is used as a measure to prevent counterfeiting and falsification in banknotes, stock certificates, securities such as bonds, printed materials such as various certificates and important documents. Intaglio printing is different from offset printing, which is often used for general commercial printing, and intaglio ink is packed into a plate surface having a printing pattern composed of concave image lines, and printed on a substrate such as paper under strong pressure. Thus, this is a printing method for forming a printed image line having ink marks, and is characterized by requiring a special printing machine.

  Printing patterns printed by intaglio printing are mainly uniform from the front, with a focus on design such as a colored pattern designed as a geometric pattern and an arabesque pattern expressing heavyness. It can be seen only as a set of lines, but it can be roughly divided into printing patterns with emphasis on anti-counterfeiting and tampering, such as latent image intaglio patterns (for example, see Patent Document 1) where the latent image pattern can be seen when viewed from a perspective. Is done.

  In any pattern, since the intaglio image line constituting the pattern has a heap of ink, it can be confirmed that it is authentic by feeling the unevenness that is not felt in offset printing with the fingertip.

  However, the scented pattern and the arabesque pattern are printed patterns with an emphasis on design, so in recent years, these copiers, etc. It is difficult to visually distinguish the copied counterfeit product visually.

  On the other hand, the latent image intaglio pattern described in Patent Document 1 included in a part of securities for the purpose of preventing counterfeiting and falsification includes a pattern area composed of intaglio image lines regularly arranged as described above, and a pattern Since it is formed of a background area composed of intaglio image lines regularly arranged in a different direction from the area, it is insufficient to provide a latent image intaglio pattern with poor design and excellent visibility. An ink deposit is required. Therefore, many burdens are imposed on the manufacturing side, such as precise plate surface design, management of flow characteristics of intaglio ink, management of proper wiping conditions and printing pressure, and the like.

  Here, conventional latent image intaglio patterns including the latent image intaglio pattern described in Patent Document 1 will be described with reference to the drawings. FIG. 1 is a schematic diagram of a typical latent image intaglio pattern (9). FIGS. 1B and 1D are diagrams showing a state (hereinafter referred to as “first viewing direction”) (E1) of the latent image intaglio pattern (9) observed from directly above (FIG. 1). (A) is sectional drawing of AA 'of FIG.1 (b), and is a schematic diagram which shows the state of the several intaglio image line (2) printed on the base material (1).

  The feature of intaglio printing is that finger sensitivity can be imparted by a convex shape with a heap of ink, compared to offset printing used in general commercial printing. A typical intaglio line height (height) is about 5 to 15 μm, but the intaglio line (2) forming the latent image intaglio pattern (9) is oblique to the substrate (1). In order to conceal the base material (1) during observation (hereinafter referred to as “second observation direction”) (E2), a height (height) of 30 to 40 μm is required. The line pitch is designed to be 200 to 300 μm so that it can be seen only as a uniform set of line when viewed from directly above. Note that the observation direction (E) and the image line arrangement direction (S) will be described in detail when the embodiment of the present invention is described.

  The latent image intaglio pattern (9) shown in FIG. 1 includes a background pattern area (4) and a latent image pattern area (3) formed by the intaglio image line (2). As shown in FIG. 1B, a plurality of intaglio image lines (2) in the background pattern region (4) are regularly printed in the first direction (S1). On the other hand, a plurality of intaglio image lines (2) in the latent image pattern area (3) are regularly printed in a direction orthogonal to the first direction (S1).

  FIG. 1C is a diagram in which the latent image intaglio pattern (9) shown in FIG. 1B is observed from the second observation direction (E2). In FIG.1 (c), the intaglio image line (2) printed on the background pattern area | region (4) will appear as a uniform ink color by concealing the base material (1). On the other hand, since the intaglio image line (2) printed in the latent image pattern area (3) is printed in parallel with the first direction (S1), the intaglio image line (2) is concealed without concealing the base material (1). It appears as a mixed color of the print line (2) and the substrate (1). Due to the difference in contrast between the background pattern area (4) and the latent image pattern area (3), the person recognizes the latent image pattern (5) hidden in the background pattern (6).

  It should be noted that the latent image intaglio pattern (9) formed by such an image line structure is an ink having a uniform latent image pattern area (3) when observed from a direction orthogonal to the first direction (S1). The background pattern region (4) can be visually recognized as a latent image pattern (5) as a mixed color of the intaglio image line (2) and the base material (1).

  As described above, in order to have good visibility, the intaglio image line (2) hides the base material (1) at a shallow angle when observed from a perspective, and as a requirement of the intaglio ink, The height, that is, the height of the intaglio line (2) is important.

  Next, as a latent image intaglio pattern (9) of another form, a latent image intaglio print having a difference in the amount of ink in the latent image pattern area (3) and the background pattern area (4) is shown in FIG. Shown in The latent image intaglio printed matter shown in FIG. 1 (d) is composed of a plurality of intaglio image lines (2) regularly printed in the first direction (S1). As shown in FIG. 1E, which is a cross-sectional view taken along the line AA ′ of FIG. It is a latent image intaglio print with a low amount (height).

  When the latent image intaglio pattern (9) is observed from the first observation direction (E1), the latent image intaglio pattern (9) shown in FIG. 1B is more effective in camouflaging the latent image pattern. When attempting to observe from the second observation direction (E2), the intaglio image line (2) of the latent image pattern region (3) is concealed from the base material (1) and is visually recognized as a uniform ink color. In the state, since the intaglio image line (2) of the background pattern region (4) cannot completely cover the base material (1), it is visually recognized as a color mixture of the base material (1) and the intaglio image line (2). The latent image pattern can be recognized.

  As shown in FIG. 1 (g), FIG. 1 (h) shows a structure opposite to the latent image intaglio pattern (9) shown in FIG. This is a latent image pattern when the height (height) of the pattern area (4) is increased.

  As described above, the technique described in Patent Document 1 is a technique capable of forming a latent image pattern due to the height of the intaglio image line. Manufactured with a lot of labor, but with the emergence of highly accurate and highly functional UV-IJP in recent years, the convex shape as formed by intaglio printing by laminating UV ink ejected in the form of dots It has become possible to easily produce printed matter formed in groups.

  By using such UV-IJP, the applicant of the present invention can construct convex image lines of different colors so as to correspond to the pattern, so that the color and shape of the image can be changed by changing the observation angle. An application has been filed for a forgery prevention formed body in which a changed latent image appears (for example, see Patent Document 2).

Japanese Patent Publication No. 56-19273 JP 2014-136324 A

  The technique described in Patent Document 2 does not require much labor as in the conventional technique described in Patent Document 1, and provides a technique for preventing forgery using a similar convex image line. However, unlike the intaglio printing press required to implement the technique described in Patent Document 1, UV-IJP can be obtained at a relatively low price, so the configuration is known. If it was possible, there was a problem that it was easily manufactured.

  Under such a background, it is excellent in design and a solid feeling like a crest pattern by intaglio printing, but a detailed image design such as the height and width of a convex image line like a conventional latent image pattern. Therefore, there has been a demand for a forgery prevention technique using a convex image line that depends on an observation angle that cannot be imitated by UV-IJP.

  Therefore, the present invention aims to solve the above-described problems, and by printing an intaglio image line having a design characteristic and a heavy feeling peculiar to intaglio printing on a substrate having a concave shape, Provided is a printed matter in which a latent image pattern appears due to an overflow phenomenon occurring in a concave portion of a material.

  The present invention has a concave shape line group in which concave shape lines of the same color as the base material are arranged in a line at least partially on the base material, and a convex shape with a color different from the concave shape line. The intaglio pattern region has a group of intaglio image lines in which a plurality of intaglio image lines are arranged, and the indented image line group is regularly arranged at the bottom, the side, and the vertex, The intaglio image line group is laminated so as to have a plurality of intersections where a part of the intaglio image line intersects on the apex portion, and the intaglio image line is a side portion or a side portion and a bottom portion of the concave shape image line adjacent to the intersection point. The intaglio ink forming the intaglio image line adheres, and has an overflow portion thicker than the image line width of the intaglio image line intersecting the apex portion, and a latent image intaglio pattern is formed by a plurality of overflow portions, When the substrate is tilted and observed, the printed matter has a latent image intaglio pattern characterized in that the latent image intaglio pattern is visible in the intaglio pattern region.

  The printed matter having a latent image intaglio pattern according to the present invention has a latent image intaglio pattern area in which the latent image intaglio pattern is formed, and an intaglio image line width and height of an intaglio image line other than the latent image intaglio pattern area. The relationship is i) the line width of the intaglio image line of the latent image intaglio pattern area is equal to the line width of the intaglio image line other than the latent image intaglio pattern area, and the line height of the latent image intaglio pattern area is Higher than the image line height other than the latent image intaglio area, or ii) the image line width of the intaglio image line in the latent image intaglio pattern area is thicker than the image line width of the intaglio image line other than the latent image intaglio pattern area, and The image line height in the latent image intaglio area is equal to the image line height in areas other than the latent image intaglio area, or iii) the image line width of the intaglio image line in the latent image intaglio area is other than the latent image intaglio area. It is thicker than the line width of the intaglio image line, and the image line height of the latent image intaglio pattern area is higher than the image line height other than the latent image intaglio pattern area. To.

  The printed matter having a latent image intaglio pattern according to the present invention is characterized in that the image line area ratio in the fixed range is equal in the image line width of the intaglio image line in a region other than the latent image intaglio pattern region and the latent image intaglio pattern region. And

  The printed matter of the present invention forms not only a simple vertical line and horizontal line structure, but also a latent image pattern concealed in a colored pattern like the conventional latent image pattern described in Patent Document 1. As a result, it was possible to improve the design for latent image patterns that depend on the viewing angle.

  The overflow phenomenon that occurs only when the intaglio image line printed with a strong printing pressure peculiar to intaglio printing and the concavo-convex shape cannot be reproduced with no pressure UV-IJP, and the forgery prevention effect is improved.

  In the latent image pattern according to the present invention, the overflow phenomenon peculiar to the slope and the bottom (concave portion) of the convex portion occurs, but in UV-IJP, in order to print the same weight as this state, it is highly accurate. Since printing is required, the latent image pattern of the present invention cannot be easily formed using UV-IJP.

  In the latent image pattern according to the present invention, the amount of ink on the intaglio image line may be much lower than the amount of ink on the intaglio image line described in Patent Document 1; Even when a plurality of printed materials are stacked between the processes, the printed material is not bulky, and a stable operation can be performed.

The schematic diagram explaining the image line structure of the conventional latent image intaglio pattern is shown. The top view which shows the printed matter in this invention is shown. The developed view which shows the latent image intaglio pattern in this invention is shown. The top view and sectional drawing which show the concave shape line group in this invention are shown. The schematic diagram explaining the "overflow part" in this invention is shown. The schematic diagram explaining the arrangement | positioning angle of an intaglio image line and a concave shape image line is shown. The schematic diagram explaining the relationship between the line width and line height of an intaglio image line is shown. The schematic diagram explaining the preparation methods of the latent image intaglio pattern in this invention is shown.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments as long as they are within the scope of the technical idea described in the claims.

  The latent image intaglio pattern utilizing the overflow phenomenon of the intaglio image line in the present invention will be described. FIG. 2 is a plan view showing a printed matter (7) including a latent image intaglio pattern (9). The printed matter (7) is, for example, a valuable printed matter such as a banknote, a passport, and an identification card. In FIG. 2, a gift certificate is taken as an example, and at least part of the substrate (1) is a feature of the present invention. A latent image intaglio pattern (9) is formed in the intaglio pattern area (8).

  The base material (1) in the present invention is paper such as high-quality paper, coated paper, art paper, etc., and if a concave shape image line group formed in the intaglio pattern region (8) described later can be formed, It is not particularly limited. Further, the intaglio pattern region (8) may be formed on the entire base material (1) as long as it is formed on the base material (1), and the size is not particularly limited. Furthermore, the intaglio pattern region (8) is formed by printing an intaglio image line group having a color different from that of the base material (1) on the concave shape image line group. This configuration will be described later.

  FIG. 3 is a plan view for explaining the latent image intaglio pattern (9) of the present invention. FIG. 3A is a schematic diagram of a geometric pattern (10) having a shape such as a flower or a band composed of a complex curve in which a plurality of intaglio image lines (2) are printed.

  In the present invention, the chromatic pattern (10) will be described as an example. However, it is limited to the chromatic pattern (10) as long as it is an aggregate of straight lines and / or curved lines that intersect the concave shape line group (13) described later. Although not intended, a geometrical pattern such as a colored pattern (10) is preferable when emphasizing the design.

  FIG. 3B is a diagram showing the latent image intaglio pattern region (11) forming the latent image intaglio pattern (9) concealed in the chromatic pattern (10). Although the expression principle of the latent image intaglio pattern (9) will be described later, the latent image intaglio pattern area (11) cannot be visually recognized when the chromatic pattern (10) is observed from the first observation direction (E1). However, when observed from the second observation direction (E2), as shown in FIG. 3C, the latent image intaglio pattern (9) represented by an aggregate of dots can be visually recognized.

  The printed matter (7) of the present invention includes an intaglio pattern region (8) in which a latent image intaglio pattern (9) serving as a characteristic point of the present invention is formed on at least a part of the substrate (1). FIG. 4A is a plan view schematically showing the concave shape line group (13) formed in the intaglio pattern region (8). The concave image line group (13) is formed at least in the intaglio pattern region (8), and the concave image lines (12) are arranged in a line in the first direction (S1). In the present invention, a state in which a plurality of lines are arranged according to a certain rule is referred to as “line-like”. The image line constituting this “line shape” may be a straight line or a curved line, but will be described below as a straight line.

  4B is a cross-sectional view taken along line A-A ′ of FIG. 4A, and FIG. 4C is a partially enlarged view of FIG. 4B. The concave image line (12) is formed in the same color as the substrate (1). The concave shaped image line (12) is formed by the inclined side part (15) and the bottom part (16), and the same surface as the surface of the substrate (1) corresponds to the apex part (14) of the convex part.

  The latent image intaglio pattern (9) of the present invention is formed by the overflow of the intaglio image line (2) printed on the side portion (15) and the bottom portion (16) forming the concave shape image line (12). The mechanism of the occurrence of the “overflow phenomenon” will be described later. If the concave shape line (12) is too shallow, the “overflow phenomenon” does not occur. On the other hand, if the depth is too deep, the intaglio line (2) is at the bottom (16). Will not be printed on the screen, the line will be cut. Therefore, it is necessary to form the depth (h1) of the concave image line (12) in the range of 30 to 60 μm.

  The latent image intaglio pattern (9) is a thick aggregate of fine dot-shaped intaglio image lines (2) generated on the side (15) and bottom (16) of the concave image line (12) due to the “overflow phenomenon”. As the pitch (P1) of the concave shape image line (12) is shorter, the “overflow phenomenon” appears to be connected when observed at a shallow angle, so that the visibility is improved. However, as the pitch (P) becomes finer, the bottom (16) having the inclined side (15) becomes shallower and narrower. Therefore, as a result of the experiment, the appropriate range of the pitch (P1) of the concave shape line group (13) is 400 to 1000 μm.

  The width (W1) of the vertex part (14) of the concave shape line group (13) is determined by the pitch of the concave shape line (12) described above. When the width (W1) of the vertex portion (14) is narrow, the area of the intaglio image line (2) printed on the vertex portion (14) is reduced, and the area of overflow is relatively increased. When observed from the observation direction (E1), the colored pattern (10) printed with the sharp intaglio image line (2) is not obtained.

  On the other hand, when the width (W1) of the apex portion (14) is increased, the bottom portion (16) becomes narrower and the inclination of the side portion (15) becomes steep, so that the intaglio image line (2) is cut off. Will be caused. Furthermore, since the latent image intaglio pattern (9) recognizes the latent image pattern (5) by visually recognizing the overflow generated on the side portion (15) and the bottom portion (16), the inclination of the side portion (15) is reduced. The abruptness leads to a deeper visible squint angle, resulting in poor visibility. Therefore, as a result of the experiment, the range of the width (W1) of the vertex portion (14) is appropriately 200 to 700 μm.

  If the base material (1) is a paper base material, the concave image line group (13) can be formed by a known scoring technique, embossing or laser processing. When the concave image line group (13) is formed by embossing, the embossing is flattened immediately before printing by the intaglio printing pressure when printing the chromatic pattern (10) by intaglio printing. ) May be deformed and collapsed, and therefore, it is preferably formed by a penetration technique or laser processing.

  Next, the intaglio image line group (17) formed on the concave shape image line group (13) will be described. Intaglio printing is an intaglio image line formed in a concave shape by transferring intaglio ink to a metal intaglio plate surface with a printed pattern formed by image lines, and then wiping with a wiping roller. Only the intaglio ink will remain. In this state, by passing the paper between the printing plate cylinder (intaglio plate surface) and the impression cylinder, the intaglio ink is transferred to the paper and becomes a printing pattern.

  The printing pressure during printing is said to be 1 ton per 1 cm of linear pressure. Therefore, a paper with a thickness of 95 μm is compressed to about 85 μm, and further, in the intaglio image line portion, an emboss shape is formed by the paper biting into the intaglio image line portion, and intaglio ink is present on the embossed shape convex portion. become. As a result, a printed material peculiar to intaglio printing can be obtained.

  Thus, in intaglio printing, at the moment when the intaglio ink is transferred to the paper, the paper is in close contact with the intaglio plate surface, and the intaglio ink in the intaglio image line portion is sealed with the intaglio plate surface portion and the paper, The intaglio ink in the intaglio image line portion does not leak laterally.

  On the other hand, the latent image intaglio pattern (9) of the present invention prints the intaglio image line (2) in a direction intersecting the substrate (1) having the indentation image line (12). The intaglio printing pressure gradually decreases from the side (15) to the bottom (16) of the line (12) and the sealing property between the base (1) and the intaglio line is lost. It will overflow (spread) in the direction. In the present invention, the overflow of the intaglio ink is referred to as “overflow phenomenon”. That is, even in the intaglio image line portion having the same image line width, the intaglio image line printed on the bottom portion (16) with respect to the vertex portion (14) is slightly thick. In the case of being parallel to the concave image line (12), the “overflow phenomenon” does not occur.

  As described above, the intaglio line group (17) of the present invention forms a geometric pattern (10) having a high design and a shape such as a flower or a band composed of complicated curves. Therefore, a plurality of intaglio image lines (2) are arranged geometrically.

  FIG. 5 is a schematic diagram showing the state of the intaglio image line group (17) printed in the intaglio pattern area (8). FIG. 5A is an enlarged view of a part of the intaglio image line group (17) printed on the intaglio image line group (13) formed in the intaglio pattern area (8). The intaglio image line group (17) is printed on the indented image line group (13) so that a part of the intaglio image line (2) intersects the indented image line (12). A point where the print line (2) and the vertex (14) of the concave line group (13) overlap is referred to as an intersection (19).

  The line width (W), pitch (P), and line height (h) of the intaglio image line (2) are not particularly limited as long as they are within the range of general intaglio printing, but the printed matter prevents forgery. Since it is intended for security prints that require effects, the line width (W) is 10 to 300 μm, the pitch (P) is 200 to 1000 μm, and the line height (h) is 5 to 70 μm. Often.

  FIG. 5B is a further enlarged view of the rectangular box in FIG. 5A. Although it is a chromatic pattern (10) constituted by arranging a plurality of uniform intaglio image lines (2) by visual observation, it is a side portion (15) of the concave shape image line (12) when further enlarged. The “overflow phenomenon” occurs from the bottom to the bottom (16). The thick part of the intaglio line (2) that causes this “overflow phenomenon” is called “overflow portion” (18). The “overflow portion” is formed adjacent to the intersection (19).

  When such an intaglio image line (2) is observed from the second observation direction (E2), the intaglio image line (2) of the apex portion (14) looks thin, whereas the bottom portion from the side portion (15). The intaglio line (2) that gradually becomes thicker toward (16) can be clearly seen.

  The “overflow phenomenon” of the intaglio ink does not occur in the intaglio line (2) in all the intaglio pattern areas (8), but the depth of the concave shape applied to the base material (1), the intaglio mark It occurs for the first time when conditions such as the height of the pressure, the image depth of the intaglio, and the image width are satisfied.

  Therefore, Table 1 shows the results of investigation on the relationship between the image depth (h), the image width (W), and the printing pressure at which the “overflow phenomenon” occurs. In addition, although it becomes image line depth (h) in an intaglio plate surface, when an intaglio ink is transferred from an intaglio plate surface to a base material (1), it becomes image line height (h).

  In the investigation, the image line depth (h) of the intaglio plate surface was set to 30 μm and 70 μm, and the image line width (W) was prepared for each image line width (W) from 40 μm to 200 μm, and the printing pressure was 1500 kgf, 2000 kgf, Printing was performed at 2500 kgf and 4000 kgf. Regarding the relationship between the image line depth (h) and the image line width (W), the image line depth (h) is smaller than the image line width (W) in consideration of stable ink transfer.

  The “overflow phenomenon” occurs when the concave shape image line (12) and the intaglio image line (2) overlap, but also affects the arrangement angle of the concave shape image line (12) and the intaglio image line (2). Receive. Therefore, as shown in FIG. 6, the concave shape image line (12) is arranged at 90 ° and the intaglio image line (2) is arranged at 45 ° with respect to the printing direction (S2). The temperature of the intaglio plate at that time is 60 ° C.

  As shown in Table 1, when the image line depth (h) was 30 μm, the “overflow phenomenon” occurred for the first time when the image line width (W) was 100 μm and the printing pressure was 4000 kgf. When the line width (W) was 120 μm, the “overflow phenomenon” occurred for all the four printing pressures confirmed.

  When the image line depth (h) is 70 μm, the image line width (W) is made larger than the image line depth (h) in consideration of stable ink transfer as described above, and the image line width (W ) Was set from 110 μm, but “overflow phenomenon” occurred in all of the image line width (w) and printing pressure from 110 μm to 200 μm.

  According to Table 1, it can be said that the “overflow phenomenon” occurs when the line depth (h) is deep, the line width (W) is wide, and the printing pressure is set high. Considering the influence on 1), it is not limited to this, so it may be set appropriately depending on the printing environment and the product.

  The larger the line width (W) of the intaglio image line (2) on the printed matter and the higher the image line height (h), the more likely the “overflow phenomenon” will occur, but all indentations in the intaglio pattern area (8) It does not mean that the line width (W) and line height (h) of the print line (2) must be so designed.

  FIG. 7 is a diagram illustrating the state of the image line width (W) and the image line height (h) of the intaglio image line (2). Since the area necessary for generating the “overflow phenomenon” is the latent image intaglio pattern area (11), the latent image intaglio can be obtained even if not all intaglio image lines (2) in the intaglio pattern area (8) are targeted. A difference may be provided between the pattern region (11) and the other region (22).

  Accordingly, in the intaglio image line (2) shown in FIG. 7A, the latent image intaglio pattern region (11) and the region (22) other than the latent image intaglio pattern region (11) have the same image line width (W2). However, as shown in the cross-sectional view at AA ′, the image line height (h2) of the latent image intaglio pattern area (11) is the image of the area (22) other than the latent image intaglio pattern area (11). It is higher than the line height (h3).

  In addition, the intaglio image line (2) shown in FIG. 7B is an area other than the latent image intaglio pattern area (11) and the latent image intaglio pattern area (11) as shown in the cross-sectional view along AA ′. 22), the line height (h2) is equal. However, the image line width (W2) of the latent image intaglio pattern area (11) is thicker than the image line width (W3) of the area (22) other than the latent image intaglio pattern area (11).

  Further, in the intaglio image line (2) shown in FIG. 7C, the image line width (W2) of the latent image intaglio pattern region (11) is an image in the region (22) other than the latent image intaglio pattern region (11). It is thicker than the line width (W3), and the image line height (h2) of the latent image intaglio pattern area (11) is other than the latent image intaglio pattern area (11), as shown in the AA ′ sectional view. It is higher than the image line height (h3) of the region (22).

  As shown in FIG. 7, when the image line width (W) and image line height (h) of the intaglio image line (2) are made different between the latent image intaglio pattern region (11) and the other region (22). The “overflow phenomenon” is likely to occur, and the cost of the intaglio ink is reduced, which is preferable.

  In Table 1, printing was performed in a state in which the arrangement direction of the intaglio image line (2) and the concave shape image line (12) was designed to be 45 ° and 90 ° with respect to the printing direction (S2), respectively. The line width (W) is 200 μm, the line depth (h) is 70 μm, the printing pressure is 2500 kgf, and the plate surface temperature is 60 ° C. The situation was investigated. The evaluation in Table 2 is as follows: ○: overflowed, Δ: partially overflowed, x: not overflowed.

  As shown in Table 2, when the arrangement angle of the concave image line (12) is 45 ° or 90 ° and the arrangement angle of the intaglio image line (2) is 0 ° with respect to the printing direction (S2), “ The “overflow phenomenon” clearly occurs, and conversely, the two overflows are arranged at the same angle, that is, in a so-called completely overlapping arrangement, the “overflow phenomenon” does not occur. In addition, since the arrangement angle where only a part of the “overflow phenomenon” occurred was also found, an appropriate arrangement angle can be found depending on each condition as in the case of the image line depth (h), image line width (W), and printing pressure. If there is no particular limitation, it may be set as appropriate.

  Next, a method for producing the latent image intaglio pattern (9) will be described with reference to FIG. FIG. 8A shows a stencil pattern. Regarding the intaglio image line (2) constituting the stencil pattern (10), the image line depth (h) and the line width at which no “overflow phenomenon” occurs in the experiment. Line drawing data is created in (W). The line depth (h) and the line width (W) where the “overflow phenomenon” does not occur are in a range other than the above-described line depth (h) and line width (W) where the “overflow phenomenon” occurs. There is no particular limitation.

  FIG. 8B shows the latent image pattern data (20), and FIG. 8C shows the state in which the latent image pattern data (20) is superimposed on the chromatic pattern (10) of FIG. By setting the line drawing data of the chromatic pattern (10) in the area where the latent image pattern data (20) overlaps as the latent image intaglio pattern area (11), the latent image pattern line drawing data (21 of FIG. 8D) is obtained. ). Next, at least one of the line drawing data in the latent image intaglio pattern area (11) is changed to the drawing line depth (h) and the drawing line width (W) at which the “overflow phenomenon” occurs. If necessary, both the line depth (h) and the line width (W) are changed.

  When the image line width (W) in the latent image intaglio pattern area (11) is changed, it differs from the image line width (W) outside the latent image intaglio pattern area (11), so the first observation direction (E1) When observed from above, the presence of the latent image intaglio pattern (9) may be confirmed. As an example of this countermeasure, intaglio image lines (2) other than the latent image intaglio pattern area (11) are arranged so as to have the same image area as the image line width (W) in the latent image intaglio pattern area (11). Process.

  As a method for equalizing the image area ratio within a predetermined range even if the image line widths (W) are different, as shown in Japanese Patent Application No. 06-206140 already disclosed by the present applicant, two lines are used at the same length. A method of equalizing the total line width (W) and the line width (W) of a single line. This method is merely an example, and the method is not limited to this as long as the same image area ratio can be formed. The series of intaglio line data is created by line drawing generation software.

  Hereinafter, although the Example of the printed matter produced concretely according to the form for implementing the above-mentioned invention is demonstrated in detail, this invention is not limited to this Example.

  Using the Adobe Illustrator made by Adobe Systems Inc., a colored pattern (10) as shown in FIG. 3A composed of a plurality of intaglio image lines was prepared. The image line width of the intaglio image line (2) constituting the chromatic pattern (10) was set to 120 μm and the image line depth was set to 30 μm.

  Next, the latent image pattern (5) was determined as the alphabet “H”, and a latent image intaglio pattern region (11) for expressing “H” was created. The latent image intaglio pattern region (11) corresponds to a mask for creating a line drawing. After this latent image intaglio pattern area (11) is overlaid on the chromatic pattern (10), the image depth in the latent image intaglio pattern area (11) is reduced so that an “overflow phenomenon” occurs. In order to make h) different from other background pattern regions (4), the thickness was changed from 30 μm to 70 μm. The image line width (W) was not changed and was kept at 120 μm.

  The intaglio image line portion was engraved on the brass plate by the corrosion method using the image line data of the chromatic pattern (10) created using the line image generation software in this way. The engraved brass plate was chrome plated to form an intaglio plate surface.

Next, in the step of producing high-quality paper having a basis weight of 85 g / m ² using a known paper machine, a concave shape line group (13) as shown in FIG. A material (1) was produced. The concave shape line (12) constituting the concave shape group (13) is a straight line formed with a straight line, the pitch (P1) is 500 μm, the width (W1) of the apex portion (14) is 300 μm, The depth of the bottom (16) was 40 μm.

  In this example, an intaglio plate surface was produced and a concave shape line group was formed by squeezing in the process of manufacturing the base material (1). Alternatively, the intaglio plate surface may be produced after the substrate (1) is produced.

  Using the manufactured base material (1), the prepared intaglio plate surface was attached to the plate cylinder of a known intaglio printing press, and intaglio printing was performed. The intaglio ink used for printing was printed using an oxidation polymerization type ink at a printing pressure of 2000 kgf.

  When the printed matter printed was observed, the chromatic pattern (10) was confirmed from the first observation direction (E1) with respect to the substrate (1), and the latent image pattern (5) was not confirmed. When the observation angle is varied from that state and the base material (1) is inclined and observed from the second observation direction (E2), the latent image pattern (5) of the letter “H” in the colored pattern (10). ) Was confirmed.

DESCRIPTION OF SYMBOLS 1 Substrate 2 Intaglio image line 3 Latent image pattern area 4 Background pattern area 5 Latent image pattern 6 Background pattern 7 Print 8 Intaglio pattern area 9 Latent image intaglio pattern 10 Color pattern 11 Latent image intaglio pattern area 12 Concave shape image line 13 Concave image line group 14 Vertex part 15 Side part 16 Bottom part 17 Intaglio image line group 18 Overflow part 19 Intersection 20 Latent image pattern data 21 Latent image pattern line drawing data 22 Area other than latent image intaglio pattern area S1 First direction S2 Printing Direction E1 First observation direction E2 Second observation direction P Pitch W Width h Depth

Claims (3)

A concave-shaped image line group in which concave-shaped image lines of the same color as the substrate are arranged in a line on at least a part of the substrate, and a concave groove having a color different from the concave-shaped image line. An intaglio pattern area having a group of intaglio image lines in which a plurality of print image lines are arranged;
The concave shape line group is regularly arranged at the bottom, the side and the apex,
The intaglio image line group and the intaglio image line group are laminated so as to have a plurality of intersections where a part of the intaglio image line intersects on the apex portion,
The intaglio image line has the intaglio ink forming the intaglio image line attached to the side or side and bottom of the concave shape image line adjacent to the intersection, and intersects the apex portion. It has an overflowing part that is thicker than the line width of the intaglio line,
A latent image intaglio pattern is formed by the plurality of overflow portions,
A printed matter having a latent image intaglio pattern, wherein the latent image intaglio pattern is visible in the intaglio pattern area when the substrate is tilted and observed. The relationship between the latent image intaglio pattern area in which the latent image intaglio pattern is formed, and the line width and line height of the intaglio image line in areas other than the latent image intaglio pattern area,
i) The line width of the intaglio image line in the latent image intaglio pattern area is equal to the line width of the intaglio image line other than the latent image intaglio pattern area, and the line height of the latent image intaglio pattern area. Is higher than the image line height other than the latent image intaglio pattern area, or
ii) The line width of the intaglio image line in the latent image intaglio pattern area is larger than the line width of the intaglio image line other than the latent image intaglio pattern area, and the line height of the latent image intaglio pattern area The image line height other than the latent image intaglio pattern area is equal, or
iii) The line width of the intaglio image line in the latent image intaglio pattern area is larger than the line width of the intaglio image line other than the latent image intaglio pattern area, and the line height of the latent image intaglio pattern area The printed matter having a latent image intaglio pattern according to claim 1, wherein the printed image has a height higher than an image line height other than the latent image intaglio pattern region.   3. The image line width of the intaglio image line is equal to an image line area ratio within a certain range in the latent image intaglio pattern region and a region other than the latent image intaglio pattern region. Printed matter having a latent image intaglio pattern.

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