JP2008120078A - Genuineness discernible printed matter, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a genuineness discernible printed matter, and a method for manufacturing the same. <P>SOLUTION: The genuineness discernible printed matter is constituted by printing a first image on the front face of a base material and printing a second image on the first image, the first image has a region where L* is 90 or more in L*a*b* color showing system when measured by a color difference meter in at least a part of the same, and the second image has a line image printed so as to have lift using a translucent ink having mirror gloss or a translucent ink containing a pigment having planar orientation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

Technical background

  The present invention relates to a printed matter capable of authenticating authenticity and a manufacturing method thereof.

  Authenticity discrimination based on whether or not the latent image is visible when the printed material is tilted and observed in valuable printed materials that need to prevent counterfeiting and alteration of banknotes, stock certificates, securities, passports, cards, etc. The one that performs is used. Examples of such a printed matter include those using an image line configuration of an intaglio printed material, those using an uneven substrate and a printed image line, and those using changes in the optical characteristics of ink.

  For example, as disclosed in Japanese Patent Publication No. 56-19273, an image line portion that forms a latent image on an intaglio-printed line is used to cause a latent image to appear by using an image line configuration of an intaglio print. Is composed of a high image line, and the non-image area is composed of an image line lower than the image area. As a result, when the angle of the printed matter is changed and observed, the interval between the lines is closed by the height of the image line in the image area at an earlier stage than the non-image area, and a latent image is developed.

  However, this method has a problem that a latent image does not appear when observed from the direction of the line, and only appears from a direction perpendicular to the line. Further, since the latent image is expressed only by the difference in height between the image area and the non-image area, the angle at which the latent image can be seen is limited, and the latent image cannot be easily confirmed.

  Japanese Examined Patent Publication No. 56-19273 discloses a printed matter in which a latent image is expressed by a uniform line width but a different orientation. However, this printed matter has a problem that a place where a latent image is formed can be easily identified by visual observation. Further, in order for the latent image to appear, the observation angle has to be deep (the printed material is greatly inclined from the horizontal state). In order to make a latent image appear at a shallow observation angle, it is necessary to increase the height of the ink, but this is difficult in producing printed matter.

  For a printed matter in which a latent image appears by utilizing a change in the optical characteristics of the ink, a pattern is gravure using an ink containing a scaly pigment on the back as disclosed in, for example, Japanese Patent Application Laid-Open No. 11-11069. Some were formed by printing or silkscreen printing. According to this, the thickness of the pattern appears to change depending on the viewing angle due to the uneven distribution of the scaly pigment. Also, the color of the pattern appears to change. Furthermore, characters or the like can be given in the pattern, and the characters can be seen and hidden by changing the observation angle. The lightness (L *) defined by JIS Z8729 on the substrate surface is in the range of 0 to 80, preferably 0 to 45. Moreover, if the weight% of the scale-type pigment with respect to the ink is 1 to 50% by weight, preferably 5 to 30% by weight, the pattern disappearance effect can be made remarkable.

  However, in this method, since the pattern appears by changing the distribution density of the pigment, the printed matter density and the printed matter film thickness are non-uniform and easily visible at normal times, and a latent image can be easily formed. There is a problem that the location is specified by a third party.

  In addition, since the pattern to appear is a simple solid image and is not composed of image lines, only one monotonous pattern in which the color change appears and disappears occurred.

  Japanese National Patent Publication No. 11-501590 discloses a data carrier having an optical conversion element in which a data carrier having an optical change structure is provided with unevenness by embossing to provide an anti-counterfeit effect.

  However, in this method, embossing is performed after printing on the surface, or printing is performed after embossing, so two steps of printing and embossing are necessary, and there is a shift between the embossing position and the printing position. There was also a risk that a problem such as this would occur.

  In addition, since the embossed trace remains on the back side of the surface to be effective, there is also a problem that adversely affects the back side design. Further, when some pressure is applied to the printed matter, there is a problem that the embossing is lost and the visual recognition effect is lost at the same time.

  Further, some of the conventional printed matter uses a concavo-convex base material and a printed image line to cause a latent image to appear. For example, in Japanese Patent No. 2615401 by the present applicant, various line patterns or relief patterns representing patterns, or both of the patterns formed by embossing and having a concavo-convex shape, the color of the material or a color other than colorless and transparent Disclosed is a printed matter in which any one of various line strokes, halftone dot strokes, or both strokes having a constant interval is printed in parallel or inclined with respect to a portion other than the above-mentioned uneven shape pattern. Has been.

  According to this printed matter, when viewed from the front, any of various line-drawing lines, halftone-dotting lines, or both drawing lines constituted by straight lines having a constant interval is confirmed. When observed from an oblique direction, the pattern formed by the concavo-convex shape is easily confirmed by the positional relationship generated between the concavo-convex shape and the printed image line having a constant interval. When observed from the opposite oblique direction, the lightness and darkness of the pattern is reversed and confirmed.

  However, since this printed matter is embossed after printing on the surface, or printing after embossing, two steps of printing and embossing are still necessary.

  Further, as disclosed in Japanese Utility Model Laid-Open No. 05-76765, an abstract pattern comprising a linear ink or a curved line aggregate is printed on the entire surface of a base sheet with a polarizing ink layer containing a pearl pigment printed thereon. There are also printed letters and character patterns with colored inks. Incident light from the front side is regularly reflected in a certain direction by the pearl pigment in the polarizing ink layer to produce gloss, and an abstract pattern or character pattern printed with color ink appears to float up.

  However, since such a printed matter prints a line drawing using ordinary ink, there is a risk of duplication and the latent image effect is insufficient.

  In the printed matter disclosed in Japanese Patent Application Laid-Open No. 11-11069, the pattern appears by changing the distribution density of the pigment and the ink height in the background portion and the character portion included in the pattern. This technique has a problem that the density of the printed material and the film thickness of the printed material become non-uniform, and the location where the latent image is formed can be confirmed by a third party. In addition, when printing a streaky image with ink containing a normal scaly pigment, the pigment may settle and impair the effect of the scaly pigment, and the disappearance or appearance of the latent image does not occur remarkably was there. There is also a problem that the brightness of the substrate must be limited.

  Further, in these conventional techniques, the latent image does not change from a negative image to a positive image or from a positive image to a negative image depending on the observation angle or the observation direction.

Summary of the Invention

  In view of the above circumstances, the present invention eliminates the need to increase the ink pile more than necessary, and eliminates the need for processing such as embossing, thereby preventing an increase in the number of steps and eliminating the influence on the back surface of the printing surface. It is an object of the present invention to propose a printed matter capable of determining authenticity and a method for producing the printed matter, which can solve problems such as disappearance of the visual recognition effect due to pressurization.

  The printed matter capable of determining authenticity of the present invention is a printed matter capable of determining authenticity in which the first image is printed on the surface of the substrate and the second image is printed on the first image, The first image has at least a region having an L * a * b * color system in which L * is 90 or more as measured by a color difference meter, and the second image has a specular gloss. It has the line drawing printed so that it may have a swell by the translucent ink containing the pigment which has the pigment which has the translucent ink which has planar orientation.

  Here, when the printed matter is observed from the direction in which the total light amount obtained by adding the specular reflection light amount and the diffused light amount is approximately equal between the first image and the second image, the first light is visually observed. The image is more clearly visible than the second image, and the overall light quantity gradually changes the angle of the printed material from a substantially equal direction to a different direction between the first image and the second image. When the observation is performed in a different manner, it is desirable that the first image gradually becomes difficult to be visually recognized with the naked eye, and is then visually recognized again.

  It is desirable that the ink used for the second image contains at least one of a scaly pigment, a metal powder pigment, a glass flake, and a cholesteric liquid crystal pigment.

  The second image includes a background image portion and at least one message image portion, and the line drawing is included in the first line drawing included in the background image portion and the message image portion. Including the line drawing and the second line drawing having a different arrangement direction, and the total light amount obtained by adding the specular reflection light amount and the diffused light amount is substantially the same between the first image and the second image. When the printed matter is observed, the background image portion and the message image portion included in the second image can hardly be distinguished with the naked eye, and the total light amount is determined by the first image and the second image. When the angle of the printed material is gradually changed from a substantially equal direction to a different direction with respect to the image, the message image in the second image changes from a negative image to a positive image or from a positive image to a negative image by the naked eye. Visually recognized And, wherein the first image is hardly gradually viewed by the naked eye, then it is desirable that visible again.

  Each of the first line drawing and the second line drawing may include a line pattern and / or a dot pattern.

  The first line drawing and the second line drawing may each have a line width in a range of 30 μm to 1000 μm.

  It is desirable that each of the first line drawing and the second line drawing has a raised height in the range of 10 μm to 150 μm.

  The ink used for printing the first line drawing and the second line drawing may be UV curable ink, electron beam curable ink, or solvent type ink.

  In order to improve the planar orientation of the pigment, the ink is preferably subjected to a surface treatment for imparting water repellency and oil repellency.

  According to the present invention, there is provided a method for producing a printed material in which a first image is printed on a surface of a substrate and a second image is printed on the first image. , Printed at least in part so as to have an area of L * a * b * color system in which L * is 90 or more as measured with a color difference meter, and the line drawing contained in the second image is specular gloss Printing is carried out with a translucent ink having a surface or a translucent ink containing a pigment having a planar orientation so as to have a swell.

  When the printed matter is observed from the direction in which the total light amount obtained by adding the specularly reflected light amount and the diffused light amount is approximately equal between the first image and the second image, the first image is viewed by the naked eye. Is observed more clearly than the second image, and the entire light quantity is observed by gradually changing the angle of the printed matter from a substantially equal direction to a different direction between the first image and the second image. Then, it is desirable to print the first image and the second image so that the first image gradually becomes difficult to be visually recognized by the naked eye, and then visually recognized again.

  You may print a said 2nd image using the ink containing at least any one of a scale-like pigment, a metal powder pigment, glass flakes, or a cholesteric liquid crystal pigment.

  The second image includes a background image portion and at least one message image portion, and the line drawing is included in the first line drawing included in the background image portion and the message image portion. Including the line drawing and the second line drawing having a different arrangement direction, and the total light amount obtained by adding the specular reflection light amount and the diffused light amount is substantially the same between the first image and the second image. When the printed matter is observed, the background image portion and the message image portion included in the second image can hardly be distinguished with the naked eye, and the total light amount is determined by the first image and the second image. When the angle of the printed material is gradually changed from a substantially equal direction to a different direction with respect to the image, the message image in the second image changes from a negative image to a positive image or from a positive image to a negative image by the naked eye. Visually recognized And, wherein the first image is hardly gradually viewed by the naked eye, then, as viewed again, it may be printed the first image and the second image.

  The first line drawing and the second line drawing may be printed so as to include a line pattern and / or a dot pattern, respectively.

  The first line drawing and the second line drawing may be printed such that the line width is in the range of 30 μm to 1000 μm.

  The first line drawing and the second line drawing may be printed such that the height of each rise is in the range of 10 μm to 150 μm.

  The first line drawing and the second line drawing may be printed using UV curable ink, electron beam curable ink, or solvent-based ink.

  The ink may be subjected to a surface treatment to impart water repellency and oil repellency in order to improve the planar orientation of the pigment.

Preferred embodiments of the invention

  Hereinafter, a printed matter capable of authenticating authenticity according to an embodiment of the present invention and a manufacturing method thereof will be described with reference to the drawings.

  In FIG. 1, a line drawing 2 constituting a background image portion and provided with a swell and a line drawing 3 constituting a message image portion and provided with a swell were printed on the base material 1 using ink having a specular gloss. Enlarged print. FIG. 2 shows an enlarged vertical section along the line X-X ′ in FIG. 1. As illustrated in FIG. 2, the line drawing 1 and the line drawing 2 each have a bulge.

  When the printed material is observed from the direction perpendicular to the printed material, more precisely, the direction in which the total light amount obtained by adding the regular reflection light amount and the diffused light amount is approximately equal between the line drawing 1 and the line drawing 2, Both the background image portion composed of 1 and the message image portion composed of the line drawing 2 are printed as thin line drawings and are not easily affected by light reflection, so that they are viewed as a solid print area. As a result, the latent image is not visualized due to the difference in the arrangement direction of the line drawings in the background image portion and the message image portion.

  Here, when the printed matter is observed from the direction in which the entire light quantity is substantially equal between the line drawing 1 and the line drawing 2, the respective line widths of the line drawing 1 and the line drawing 2 in order to be visually recognized as a solid printed matter. Is preferably in the range of 30 to 1000 microns, for example, and more preferably in the range of 60 to 200 microns.

  When the printed material is observed from an oblique direction, a message image appears when the printed material is observed from different directions in which the total light amount obtained by adding the specularly reflected light amount and the diffused light amount is different between the line drawing 1 and the line drawing 2. . Depending on the viewing angle, at least one of the lightness and darkness and color of the message image changes continuously, and the message image appears while changing from a negative image to a positive image or from a positive image to a negative image.

  When the line image 2 in the background image portion and the line image 3 in the message image portion are configured using a line pattern or / and a curved line pattern, when the printed matter is observed with an inclination, the line image 2 is displayed between the background image portion and the message image portion. The amount of reflected light is greatly different. Thereby, the brightness difference between the two becomes large, and the visibility of the latent image in the message image portion is further improved.

  Here, in the line drawings 2 and 3, it is preferable that the image line and the non-image line are equally spaced. The angle between the arrangement direction of the line drawing 2 in the background image portion and the arrangement direction of the line drawing 3 in the message image portion is preferably in the range of 30 to 150 degrees. Further, when the angle in the arrangement direction of the line drawing 2 in the background image portion is 0 degree, the angle in the arrangement direction of the line drawing 3 in the message image portion is preferably approximately 90 degrees.

  In addition, when three message image parts are included in the basic image, the angle of the line drawing 3 in the message image part is set to 45, 90, 135 degrees, for example, when the arrangement direction of the line drawing 2 in the background image part is 0 degree. Each may be set.

  Alternatively, in the line image 2 in the background image portion and the line image 3 in the message image, the line width of each image line is changed stepwise and / or continuously, so that a latent image having an arbitrary gradation is obtained when the printed material is inclined. An image is represented. Thereby, the forgery prevention effect can be further enhanced.

  As described above, the line drawing 2 and the line drawing 3 need to have a bulge. It is desirable that the ink piles of the line drawings 2 and 3 are in the range of, for example, 10 to 150 microns. When the height of the ink is less than 10 microns, the message image portion does not appear clearly even if the printed material is tilted and observed. On the other hand, if the rise of line drawing 2 and line drawing 3 exceeds 150 microns, it will be difficult to produce even if the latent image appears.

  The ink for forming the line image 2 in the background image portion and the line image 3 in the message image portion only needs to have a specular gloss, and is not limited to the type of color, and may be transparent. Here, the ink having specular gloss refers to an ink having higher light reflectivity than the ink used in normal book printing or the like.

  For example, FIG. 3 shows an enlarged print using an ink having a specular gloss. When this printed matter is irradiated with light from the direction A, for example, the amount of reflection of light from the side surface b of the line drawing 4 and the side surface c of the line drawing 5 is observed in comparison with the amount of light reflection from the side surface a of the line drawing 4 having a bulge. Since it changes depending on the angle, a difference in brightness occurs, and the latent image can be confirmed.

  Furthermore, in order to produce a raised line drawing, a UV curable ink, an electron beam curable ink, an ink having both ultraviolet curing and oxidation polymerization functions (see Japanese Patent No. 2113880), or a two-component mixed ink, etc. Can be used. However, it is preferable to use UV curable ink or electron beam curable ink. When UV curable ink is used, it is necessary to cure the ink using active energy rays from an ultraviolet irradiation device or the like during or after printing.

  Inclusion of scale pigments such as pearl pigments, metal powder pigments, glass flakes, or cholesteric liquid crystal pigments in UV curable inks or electron beam curable inks increases the effect of light reflection and makes the pigments unique Since an effect is obtained, a message image can appear even at a shallow angle.

  FIG. 4 shows a schematic diagram of an optical color change of a pearl print having a small amount of ink, which is used in a general offset print and uses a scaly pigment such as a pearl pigment. Here, the position where the image is viewed is fixed, and the position of the light source is changed. The color when the light source is installed at the height of X changes when the light source is moved to the height of Y. Furthermore, when the light source is moved to the height of Z, the color returns to the color when the light source is installed at the height of X.

  FIG. 5A shows an enlarged view of a longitudinal section along the line XX ′ of FIG. 5A, and FIG. 5A shows a printed matter having an image obtained by combining such a scaly pigment such as a pearl pigment and an image line with little ink. Shown in FIG. 5B. As described above, when the viewpoint is fixed to this printed matter and light is irradiated while changing the position of the light source, the line drawing 6 and the line drawing 7 change in color at the same timing.

  Here, as the pearl pigment, for example, an iris pearl pigment, a dichroic pearl pigment, or another scaly pigment may be used. In this way, pearl pigments may be used in any case, but in order to improve the orientation (leafing effect) of the scaly pigment, a treatment is performed so that the pigment is oriented on the surface of the rising line drawing. Is desirable. Specifically, for example, surface treatment such as water repellency and oil repellency treatment described in JP-A-2001-106937 is performed. Thereby, as shown in FIG. 6, the pigment 100 can be oriented on the surface of the printed matter.

  By the way, as described above, a line drawing having a bulge needs to have fast curing properties. Therefore, for example, a UV curable ink, an electron beam curable ink, an ink having both ultraviolet curable and oxidative polymerization functions, or a two-component mixed ink is blended with a pigment subjected to the above surface treatment (water repellency, oil repellency treatment). It prints using ink etc., and irradiates active energy rays, such as an ultraviolet irradiation device, after printing. As a result, the pigment does not settle even when a line drawing having a swell is formed, and the pigment can be oriented on the surface of the drawing line as shown in FIG.

  When the water and oil repellency treatments are not performed, the ink is cured before the scaly pigment is oriented. For this reason, the pearl effect is not generated, or even if the pearl effect is generated, the visual effect is often inferior compared with the pigment subjected to the water and oil repellency treatment.

  Here, the particle diameter of the pearl pigment is, for example, 1 to 150 μm, preferably 5 to 50 μm, and the average particle diameter is preferably about 10 to 25 μm.

  The line drawing 5 shown in FIG. 3 is printed using a scaly pigment that has been subjected to water and oil repellency treatments. FIG. 7 shows an enlarged view when the line drawing 8 obtained in this way is irradiated with light from the A direction and viewed from the B direction. When the viewpoint is fixed and the height of the light source is changed, a color change occurs in the line drawing 8 at the same timing as that of the line drawing having a small amount of ink in the line drawing.

  Similarly, the line drawing 4 shown in FIG. 3 is printed using a scaly pigment that has been subjected to water and oil repellency treatments. FIG. 8 shows an enlarged view of the obtained line drawing 9 when light is applied from the A direction and viewed from the B direction. The line drawing 9 has a three-dimensional shape due to the thick ink pile of the line drawing. First, the color change occurs on the side surface a, so that the latent image can be confirmed. When the angle at which the light is applied is changed, a color change subsequently occurs on the side surface b. Incidentally, at this timing, a color change also occurs simultaneously in the line drawing 8 shown in FIG. For this reason, it becomes impossible to distinguish between the message image and the background image. When the angle at which light is further applied is changed, a color change occurs on the side surface c in FIG. 8, and the latent image can be confirmed again. That is, since the color change occurs continuously and repeatedly in the line drawing 9 shown in FIG. 8, the timing of the color change with the line drawing 8 shown in FIG. 7 where the color change occurs only once. Shift or match. Thereby, the disappearance and expression of the image become remarkable. Moreover, the effect of widening the angle at which the color change occurs can be obtained by continuously and repeatedly generating the color change.

  The printing method used in the first embodiment is not limited as long as it is a method capable of providing a heap of ink. For example, a screen printing technique or the like may be used. In addition, no special adjustment is required for the adjustment of the printing press, and printing can be performed with the usual general settings.

  Moreover, as a base material in the said 1st Embodiment, it can use widely, without being limited to materials, such as paper sheets, a plastic film, a metal, a cloth.

  Hereinafter, some examples that were prepared according to the first embodiment will be described in more detail. However, the present invention is not limited to these examples.

(Example 1)
FIG. 9 shows an enlarged view of the basic image P in the first and second embodiments. The basic image P is composed of line drawings having a pitch width of 200 microns and an image line width of 100 microns, and is divided into a background image portion 10 and a message image 11 subjected to a latent image. When the angle of the line drawing arrangement direction of the background image unit 10 is 0 degree, the angle of the line drawing arrangement direction of the message image 11 is 90 degrees.

A screen plate for printing the basic image P was prepared, and ink was prepared at the following blending ratio.

Composition of screen printing ink Pigment 10 parts by weight (SiO2 silica powder)
50 parts by weight of urethane acrylate (UX-4101 manufactured by Nippon Kayaku Co., Ltd.)
30 parts by weight of monomer (Nippon Kayaku PEG-400DA)
9 parts by weight of initiator (Irgacure 819 manufactured by Ciba Specialty Chemicals)
Inhibitor 0.5 part by weight (Methylhydroquinone manufactured by Tokyo Chemical Industry Co., Ltd.)
Antifoam 0.5 parts by weight (SC5540 manufactured by Toray Dow Corning Silicone)

  Using the obtained screen plate surface and screen ink, printing was performed with a screen printer and cured with an ultraviolet irradiation device to obtain a printed matter of Example 1.

  In FIG. 10, the printed matter according to the first embodiment is observed from directly above (more accurately, from the direction in which the total light amount obtained by adding the regular reflection light amount and the diffused light amount is substantially equal between the line image in the message image and the line image in the background image). Shows how it was done. As shown in FIG. 10, when this printed matter is observed from directly above, the basic image P is visually recognized as a printing area that is almost uniform as a whole, and the message image 11 can hardly be visually recognized.

  In FIG. 11, the printed matter according to Example 1 was observed from a shallow angle (more precisely, from the direction in which the total light amount obtained by adding the regular reflection light amount and the diffused light amount is different between the line image in the message image and the line image in the background image). Show the state. A brightness difference was generated between the background image portion 10 and the message image 11, the message image 11 was visually recognized as a positive image, and the message image could be visually recognized. In this case, the total amount of light in the background image portion 10 is smaller than that in the message image portion 11.

  FIG. 12 shows the printed matter of Example 1 observed from a deeper angle (more precisely, from the direction in which the total light amount obtained by adding the regular reflection light amount and the diffused light amount is different between the line image in the message image and the line image in the background image). Here is how it looks. A brightness difference was generated between the background image portion 10 and the message image 11, and the message image 11 was visually recognized as a negative image in this case, and the message image could be visually recognized. In this case, the background image portion 10 has a larger amount of light than the message image portion 11.

  As described above, when the printed material is gradually changed from a shallow angle to a deep angle, the background image portion 10 gradually changes from a negative image to a positive image, or from a positive image to a negative image, and the message image 11 is changed from the background image 10. On the contrary, the message image 11 can be visually recognized by changing from a positive image to a negative image or from a negative image to a positive image.

(Example 2)
Although it was the same method as the said Example 1, the printed matter by Example 2 was produced using what the ink mix | blended with the following ratio different from the said Example 1. FIG.

Composition of ink for screen printing Scale pigment 20 parts by weight (Highly oriented pearl pigment manufactured by Merck Japan)
40 parts by weight of urethane acrylate (UX-4101 manufactured by Nippon Kayaku Co., Ltd.)
30 parts by weight of monomer (PEG-400DA manufactured by Nippon Kayaku Co., Ltd.)
9 parts by weight of initiator (Irgacure 819 manufactured by Ciba Specialty Chemicals)
Inhibitor 0.5 part by weight (Methylhydroquinone manufactured by Tokyo Chemical Industry Co., Ltd.)
Antifoam 0.5 parts by weight (SC5540 manufactured by Toray Dow Corning Silicone)

  When the printed matter according to Example 2 was observed from directly above, it was visually recognized as a substantially uniform solid print area like the printed matter according to Example 1, and the message image 11 could not be visually recognized. However, when observed from an oblique direction, a change in color occurs in the background image portion 10 and the message image 11, and a difference in brightness occurs more than in the printed matter of Example 1, so that the message image can be visually recognized more clearly.

  Next, in order to judge whether the ink was good or not, printed materials according to some reference examples were produced, and the visibility of the message image portion when the obtained printed materials were observed while being tilted was tested. As evaluation methods, ○ clearly indicates that the message image has changed from a negative image to a positive image, △ indicates that the message image has changed, although it is not clearly, and almost cannot be identified. A thing or a thing which cannot be distinguished at all was evaluated in three steps, such as x. The evaluation results are shown in FIG.

(Reference Example 1)
A printed matter (solvent dry type) according to Reference Example 1 was prepared using the same method as in Example 1 and using the ink blended in the following ratio as the ink.

Composition of ink for screen printing Scale pigment 20 parts by weight Pigment similar to Example 2 (Highly oriented pearl pigment manufactured by Merck Japan Ltd.)
Solvent type varnish 79.5 parts by weight (SG720 manufactured by Seiko Advance)
Antifoam 0.5 parts by weight (SC5540 manufactured by Toray Dow Corning Silicone)

  When the printed matter of Reference Example 1 was observed from an oblique direction, the message image could not be visually recognized.

(Reference Example 2)
Using the same ink as in Example 1, printing was performed by the offset printing method, and the printed matter of Reference Example 2 was obtained. When the printed matter of Reference Example 2 was observed obliquely, the message image could not be visually recognized.

  As described above, according to the above-described embodiment, the printed matter capable of determining authenticity and the manufacturing method thereof, the message image is not confirmed when viewed from directly above, but is shallow when observed from an oblique direction. The message image becomes apparent at an angle, and the message image changes from a negative image to a positive image or from a positive image to a negative image at a deeper observation angle, so that it is easier for the general public to use without using an expensive authenticity determination device. Authenticity discrimination can be performed.

  In addition, there is no need to make the ink height higher than necessary, and there is no effect on the back side of the printing surface because there is no processing such as embossing, and problems such as loss of visual effect due to pressure do not occur, Furthermore, since two steps of printing and embossing are not required, work efficiency can be improved.

  Furthermore, by producing a thick print using an ink containing a pearl pigment or the like, the color and / or brightness change of the background image portion and the message image portion can be changed depending on the observation angle without impairing the optical effect. The timing of the change in color and / or lightness is shifted, and depending on the viewing angle, the degree of change of the message image from the negative image to the positive image or from the positive image to the negative image becomes remarkable, and a higher forgery prevention effect can be obtained.

  A printed material according to the second embodiment of the present invention will be described with reference to the drawings. The printed matter according to the second embodiment includes a first image printed on a base material and a second image printed on the first image, as will be described later.

  An ink having a specular gloss used for the second image or an ink containing a pigment having a planar orientation will be described. As described above, the specular gloss ink is an ink having a higher light reflectivity than an ink used for printing a normal book or the like, that is, an ink having a strong reflected light amount. Therefore, the ink is not limited as long as the ink has a strong reflected light amount, but in the present embodiment, a translucent ink or a translucent ink containing a coloring pigment is preferable.

  In addition, the effect of disappearance of the latent image of the first image is improved by using a translucent ink containing a coloring pigment having the same color or substantially the same color as the hue of the first image of the background to be described later. However, you may use the transparent ink which does not contain such a color pigment.

  FIG. 14 is an enlarged view of the image lines 1 and 2 printed so as to have a scale using ink having a specular gloss. Consider a case where the printed matter is irradiated with light from the A direction in the drawing and observed from the B direction.

  With respect to the amount of light reflected from the side surface a of the image line 1, the amount of light reflected from the side surface b of the image line 1 and the side surface c of the image line 2 varies depending on the observation angle. As a result, a difference occurs in the brightness difference between the image line 1 and the image line 2. Therefore, when the printed material produced with the configuration in which the arrangement direction of the line drawing in the background image portion and the arrangement direction of the line drawing in the message image portion are different as shown in the drawing line 1 and the drawing line 2 is tilted and observed, the background image portion and the message The message image portion can be identified by causing a brightness difference between the image portion and the brightness difference being inverted depending on the inclination of the printed matter.

  FIG. 15A shows an enlarged state of pigment distribution in an ink film printed with an ink containing a pigment having no planar orientation, and FIG. 15B shows an ink printed with an ink containing a pigment having a planar orientation. The pigment distribution state in a film is expanded and shown.

  When printing is performed with an ink containing the pigment 3 having no planar orientation, the pigment 3 is randomly oriented throughout the ink film as shown in FIG. 15A. On the other hand, when printing with the ink containing the pigment 4 having planar orientation, the ink is oriented along the surface in the ink film as shown in FIG. 15B.

  Such planar orientation (leafing effect) can be obtained by subjecting the pigment to a water and oil repellency treatment as described in, for example, JP-A-2001-106937. When the pigment has water repellency and oil repellency, the pigment is less likely to settle at the lower part in the ink film and is oriented along the upper surface in the ink film.

  On the other hand, a pigment that has not been subjected to water / oil repellency treatment does not have planar orientation, and the ink dries before the pigment is oriented and is randomly oriented throughout the coating.

  The pigment having planar orientation in the present embodiment is preferably a pearl pigment, a scaly pigment, a metal powder pigment, a glass flake, or a cholesteric liquid crystal pigment. By using such an optically variable pigment, it becomes easier to reflect light, an effect unique to the pigment is obtained, and a brightness difference is greatly generated between the background image portion and the message image portion of the second image. As a result, the message image appears more clearly, and the message image appears even if the angle of tilting the printed material is shallow. As a result, an effect of preventing copying using a copying machine, an image input device or the like can be obtained.

  FIG. 16 shows a schematic diagram of the optical color change in a pearl print having a small amount of ink represented by a general offset print using a scaly pigment such as a pearl pigment.

  It is assumed that the viewing position is fixed to the image 6 printed using the ink containing the pearl pigment on the substrate 5 and the height of the light source is changed to X, Y, and Z. The color when the light is irradiated from the height of X changes its color when the height of the light source is changed to Y. Further, when the light source is moved to the height of Z, the color returns to the color when light is irradiated from the height of X. However, an optically changing pigment such as a pearl pigment has different interference light depending on the refractive index, shape, thickness, size, pigment distribution in the ink film, and the like.

  Here, as the pearl pigment, an iris pearl pigment, a dichroic pearl pigment, or another scale pigment may be used. The particle size of the pearl pigment is 1 to 150 μm, preferably 5 to 50 μm, and the average particle size is preferably about 10 to 15 μm.

  FIG. 17A shows a printed matter in which the image line 7 and the image line 8 are printed using an ink containing a scaly pigment that has been subjected to water and oil repellency treatments so as to be planarly aligned. As shown in FIG. 17B, which is a longitudinal sectional view taken along the line PP ′ of FIG. 17A, the scaly pigment 9 exhibits orientation (leafing effect) on the upper surface in the ink film of the image lines 7 and 8. Yes.

  By printing the second image with an ink containing scaly pigment that has been subjected to water- and oil-repellent treatments so as to be planarly oriented, the message image can appear more clearly.

  As described in the first embodiment, the swelled image line needs to have fast curing properties. For this reason, the pigment which performed the said surface treatment (water repellency, oil repellency treatment) was included in UV curable ink, electron beam curable ink, the ink which has both ultraviolet curing and oxidation polymerization function, or two-component mixed ink. It is necessary to print using ink or the like, and to irradiate an active energy ray such as an ultraviolet irradiation device after printing.

  As a result, the pigment does not settle even when an image line with swell is formed, and the scaly pigment 9 is oriented (the leafing effect) on the upper surface of the ink film of the image lines 7 and 8 as shown in FIG. 17B. ) And a visual effect can be achieved.

  If the water and oil repellency treatments are not applied, the ink cures before the scaly pigment is oriented, so the pearl effect does not occur, or even if the pearl effect occurs, the water and oil repellency treatments are performed. The visual effect is inferior compared to the applied pigment.

  FIG. 18 shows an enlarged view of the image 7 printed with ink containing a scaly pigment that has been subjected to water and oil repellency treatments, as viewed from the direction B by applying light from the A direction. When the viewpoint is fixed and the height of the light source is changed, a color change occurs between the viewpoints X, Y, and Z at the same timing as in the case described with reference to FIG.

  When the image line 8 shown in FIG. 17 is printed using a scaly pigment that has been subjected to water and oil repellency treatment, and light is applied from the A direction and observed from the B direction as shown in FIG. Is as follows.

  The image line 8 has a three-dimensional shape due to thick ink, and when light is applied from the A direction and observed from the B direction, the wavelengths of light reflected by the scaly pigments in the regions a, b, and c are different. Thereby, different colors are observed in the regions a, b, and c.

  When the light is applied from the A direction and observed from the B direction, the image line 7 arranged in a direction perpendicular to the image line 8 shows the same color as the area b of the image line 8, c indicates a color different from the image line 7. When the angle of light is changed, a situation where the image line 7 shows the same color as the region a or c of the image line 8 occurs, and a region b of the image line 8 is observed differently from the color of the image line 7 Will occur.

  FIG. 20A shows a first image 10 in the printed material according to the present embodiment. The first image 10 needs to be printed by providing a low density region on a part or the entire surface of the image. In terms of design, a high-density region may be provided in a part of the first image 10. The printing method is not particularly limited, but the offset printing method is preferable.

  The low-density area on which the first image 10 is printed is a color difference meter, and the L * a * b * color system needs to have L * of 90 or more, preferably 95 or more. If this value is less than 90, the effect of the first image 10 disappearing cannot be obtained when the printed material is observed while being tilted continuously from the direction directly above.

  FIG. 20B shows the second image 11. The second image 11 needs to be constituted by a line drawing having a large ink height with a translucent ink having a specular gloss or a translucent ink containing a pigment having a planar orientation. Therefore, it is preferable to use a translucent ink containing an optically changing pigment, a translucent ink containing a colored pigment, or a translucent ink. However, even if transparent ink is used, a visual effect can be achieved. More preferably, by using a translucent ink having the same color or substantially the same color as the hue of the first image 10, the visual effect of appearance and disappearance of the latent image is improved. The printing method is not particularly limited, but an intaglio printing method or a screen printing method is preferable.

  FIG. 20C shows another example of the second image 11. The second image 11 includes a background image portion 12 and at least one message image portion 13, and the angle of the line drawing arrangement direction is different between the background image portion 12 and the message image portion 13. . In addition, an ink pile is formed on each line of the line drawing.

  FIG. 21 shows a more detailed configuration of the printed material. A first image 10 shown in FIG. 20A is printed on the substrate 14, and a second image 11 shown in FIG. 20C is printed over the first image 10. Alternatively, the second image 11 shown in FIG. 20B may be overprinted instead of the second image 11 shown in FIG. 20C.

  When the second image 11 is printed using a translucent ink containing an optically variable pigment having planar orientation, a longitudinal section along the line PP ′ of the printed material shown in FIG. 21; A partially enlarged view is shown in FIG. A first image 10 is provided on the base material 14, and a second image 11 corresponding to a background image is provided on the first image 10. The second image 11 includes a line drawing 12 having a swell and a line drawing 13 having a swell included in the message image unit 13.

  A pigment 15 having a planar orientation and optically changing, which is included in each line in the raised line drawing 12 as the background image portion 12 and the raised line drawing 13 as the message image portion 13, is an ink film. Oriented to align along the top surface.

  FIG. 23 shows a state when the printed matter shown in FIGS. 21 and 22 is observed from directly above. The background image portion 12 and the message image portion 13 in the second image 11 cannot be distinguished with the naked eye, and only the first image 10 can be confirmed. The second image 11 composed of line drawings is printed with a translucent ink having a specular gloss or a translucent ink containing a pigment having a planar orientation. For this reason, the incident light is divided into light that is transmitted through the ink film of the second image 11 to be transmitted light, and light that is regularly reflected and irregularly reflected on the ink film of the second image 11. The transmitted light transmitted through the ink film of the second image 11 becomes the reflected light of the first image 10, and only the first image 10 is confirmed with the naked eye.

  In addition, the line drawing arrangement direction is different between the background image portion 12 and the message image portion 13 in the second image 11. These line drawings are fine line drawings that are difficult to see with the naked eye, and further, the amount of transmitted light, the amount of irregularly reflected light, the amount of specularly reflected light on the ink film of the background image portion 12, and the ink film of the message image portion 13 Since the transmitted light amount, the diffusely reflected light amount, and the regular reflected light amount are substantially equal, the background image portion 12 and the message image portion 13 can be hardly discriminated with the naked eye although the arrangement directions of the line drawings are different.

  The line widths of the line image in the background image portion 12 and the line image in the message image portion 13 are preferably in the range of 30 μm to 1000 μm. Furthermore, it is more preferable that it is in the range of 60 μm to 200 μm.

  By making such a fine line drawing, incident light is more diffusely reflected on the ink film, making it difficult to distinguish between the background image portion 12 and the message image portion 13 for confirmation. As a result, as shown in FIG. 23, since the second image 11 printed on the first image 10 is printed with the translucent ink, only the first image 10 is seen through. become.

  FIGS. 24A to 24D show a state where the printed matter shown in FIG. 22 is observed while being continuously tilted from the X direction.

  FIG. 24A shows a state where the printed matter of FIG. 9 is tilted at a shallow angle.

  The arrangement direction of the line drawings is different between the background image portion 12 and the message image portion 13 in the second image 11 shown in FIG. 20C. For this reason, the incident light is confirmed bright in the background image portion 12 arranged in the vertical direction because the light of the regular reflection light amount is strong due to the transmitted light amount and the irregular reflection light amount on the ink film.

  On the other hand, the message image portions 13 arranged in the horizontal direction are confirmed to be dark because the transmitted light amount and the irregularly reflected light amount on the ink film are stronger than the background image portion 12 and the regular reflected light amount is weak.

  As a result, the message image portion 13 is confirmed as a positive image, and the background image portion 12 and the message image portion 13 in the second image 11 are more regularly reflected than when observed from directly above as shown in FIG. Therefore, it is difficult to visually recognize the colored component of the first image 10, and the first image 10 is visually recognized as having disappeared.

  FIG. 24B shows a state in which the printed matter shown in FIG. 9 is further tilted from the position shown in FIG. 24A. As described above, the arrangement direction of each line drawing differs between the background image portion 12 and the message image portion 13 of the second image 11. However, it is a fine line drawing that is difficult to see with the naked eye, the transmitted light amount on the ink film of the background image portion 12 arranged in the vertical direction, the irregularly reflected light amount, the regular reflected light amount, and the message image arranged in the horizontal direction. The amount of transmitted light, the amount of irregularly reflected light, and the amount of specularly reflected light on the ink film of the portion 13 are almost the same, and the background image portion 12 and the message image portion 13 having different line drawing arrangement directions are difficult to distinguish with the naked eye. Yes.

  In addition, since the amount of specular reflection light is greater than the amount of transmitted light in the background image portion 12 and the message image portion 13 than when observed from directly above shown in FIG. 23, the colored component of the first image 10 is visually It becomes difficult to see. For this reason, it is visually recognized as if the first image 10 has disappeared, and is visually recognized as a solid image 17 on which nothing is printed. In this case, when the light source is weak, the amount of specular reflection of the second image 11 is weak, so that the first image 10 can be viewed with the naked eye.

  FIG. 24C shows a state in which the printed matter shown in FIG. 22 is further tilted from the position shown in FIG. 24B. The background image portion 12 and the message image portion 13 of the second image 11 shown in FIG. 20C have different line drawing arrangement directions. For this reason, in the message image portions 13 arranged in the horizontal direction, the light of the regular reflection light amount is confirmed to be stronger and brighter than the transmitted light amount and the irregular reflection light amount on the ink film.

  On the other hand, in the background image portion 12 arranged in the vertical direction, the transmitted light amount and the irregular reflection light amount on the ink film are stronger than the message image portion 13, and the light of the regular reflection light amount is weak, so it is confirmed dark. Therefore, the message image part 13 is confirmed as a negative image. The background image portion 12 and the message image portion 13 of the second image 11 have a higher amount of specularly reflected light than when observed from directly above as shown in FIG. For this reason, the colored component of the first image 10 becomes difficult to visually visually recognize, and the first image 10 is visually recognized as having disappeared.

  FIG. 24D shows a case where the printed matter of FIG. 22 is further tilted than FIG. 24C. The line drawing arrangement directions of the background image portion 12 and the message image portion 13 of the second image 11 shown in FIG. 20C are different. However, it is a fine line drawing that is difficult to see with the naked eye, the transmitted light amount on the ink film of the background image portion 12 arranged in the vertical direction, the irregularly reflected light amount, the regular reflected light amount, and the message image arranged in the horizontal direction. The background image part 12 and the message image part 13 in which the amount of transmitted light, the amount of irregularly reflected light, and the amount of specularly reflected light on the ink film of the part 13 are almost equal and the arrangement directions of line drawings are different are made difficult to distinguish with the naked eye.

  In addition, since the amount of transmitted light of the background image portion 12 and the message image portion 13 is stronger than when observed from directly above shown in FIG. 23, the reflected light of the first image 10 is generated, and the first image 10 is visually observed. It is confirmed. Therefore, it is visually recognized in the same state as observed from directly above shown in FIG.

  FIG. 25A, FIG. 25B, FIG. 25C, and FIG. 25D show how the printed matter of FIG. 21 and FIG.

  FIG. 25A shows a case where the printed matter shown in FIGS. 21 and 22 is tilted at a shallow angle.

  The line drawing arrangement directions of the background image portion 12 and the message image portion 13 of the second image 11 shown in FIG. 20C are different. For this reason, in the message image section 13 arranged in the vertical direction, the incident light is confirmed to be brighter and brighter than the transmitted light amount and the irregularly reflected light amount on the ink film.

  On the other hand, the background image portion 12 arranged in the horizontal direction is confirmed to be dark because the transmitted light amount and the irregular reflection light amount on the ink film are stronger than the message image portion 13 and the regular reflection light amount is weak.

  Therefore, the message image portion 13 is confirmed as a negative image, and the background image portion 12 and the message image portion 13 of the second image 11 have a higher amount of specularly reflected light than when observed from directly above shown in FIG. Since the colored component of the first image 10 is difficult to visually visually recognize, the first image 10 is visually recognized as having disappeared.

  FIG. 25B shows a case where the printed matter of FIG. 22 is further tilted from the state shown in FIG. 25A.

  The line drawing arrangement directions of the background image portion 12 and the message image portion 13 of the second image 11 shown in FIG. 20C are different. However, it is a fine line drawing that is difficult to see with the naked eye, and the transmitted light amount, irregularly reflected light amount, regular reflected light amount on the ink film of the background image portion 12 arranged in the horizontal direction, and the message image arranged in the vertical direction. The amount of transmitted light, the amount of irregularly reflected light, and the amount of specularly reflected light on the ink film of the portion 13 are almost the same, and the background image portion 12 and the message image portion 13 having different line drawing arrangement directions are difficult to distinguish with the naked eye. Yes.

  In addition, the amount of specularly reflected light is stronger than the amount of light transmitted through the background image portion 12 and the message image portion 13 than when observed from directly above shown in FIG. For this reason, since it becomes difficult to visually recognize the colored component of the 1st image 10, it is visually recognized as the 1st image 10 lose | disappeared.

  Therefore, it is confirmed as a solid image 17 that has nothing printed at first glance. In this case, in the case of a weak light source, the amount of specular reflection of the second image 11 becomes weak, so that the first image 10 can be visually recognized with the naked eye.

  FIG. 25C shows a case where the printed matter of FIG. 22 is further tilted from the state shown in FIG. 25B. Since the arrangement direction of the line drawing of the background image portion 12 and the message image portion 13 of the second image 11 shown in FIG. 20C is different, the background image portion 12 arranged in the horizontal direction transmits on the ink film. The light of the regular reflection light amount is confirmed to be stronger and brighter than the light amount and the irregular reflection light amount.

  On the other hand, in the message image section 13 arranged in the vertical direction, the transmitted light amount and the irregularly reflected light amount on the ink film are stronger than the background image portion 12, and the regular reflected light amount is weak, so it is confirmed dark. Therefore, the message image unit 13 is confirmed as a positive image. Since the first image 10 shown in FIG. 20A has a higher amount of specularly reflected light than when the background image portion 12 and the message image portion 13 of the second image 11 are observed from directly above shown in FIG. The colored component of the first image 10 becomes difficult to visually visually recognize, and the first image 10 is visually recognized as having disappeared.

  FIG. 25D shows a case where the printed matter of FIG. 22 is further tilted from the state shown in FIG. 25C. The line drawing arrangement direction of the background image portion 12 and the message image portion 13 of the second image 11 shown in FIG. 20C is different. However, it is a fine line drawing that is difficult to see with the naked eye, the transmitted light amount, the irregularly reflected light amount, the regular reflected light amount on the ink film of the message image portion 13 arranged in the vertical direction, and the background image arranged in the horizontal direction. The amount of transmitted light, the amount of irregularly reflected light, and the amount of specularly reflected light on the ink film of the portion 12 are substantially the same, making it difficult to distinguish the background image portion 12 and the message image portion 13 with different line drawing arrangement directions with the naked eye. .

  Further, since the amount of transmitted light of the background image portion 12 and the message image portion 13 is stronger than when observed from directly above as shown in FIG. 23, the reflected light of the first image 10 is obtained, and the first image 10 is confirmed with the naked eye. Is done. Therefore, it is visually recognized in the same state as observed from directly above shown in FIG.

  That is, when the printed matter of FIGS. 21 and 22 is observed while being continuously tilted from directly above, the message image of the second image 11 can be confirmed by switching from the negative image to the positive image or from the positive image to the negative image. In addition, the first image 10 gradually becomes difficult to confirm with the naked eye, and appears again.

  The timing at which the appearance / disappearance of the first image 10 varies depending on the light amount of the light source and the brightness of the color of the first image 10.

  The appearance timing of the negative image / positive image of the second image 11 varies depending on the light amount of the light source, the pitch of the line drawing, and the like.

  In order to make the message image portion 13 provided in the second image 11 appear clearly when the printed matter of this embodiment is observed while being tilted continuously from directly above, the line image and the message image portion of the background image portion 12 are displayed. Since the 13 line drawings are composed of at least one of a line pattern and a dot pattern, the difference between the light amounts of the reflected light between the background image portion 12 and the message image portion 13 becomes clear, and the message image portion becomes clearer. The visibility of the 13 latent image portions is improved.

  The shape of the line pattern can be formed as a straight line pattern, a curved line pattern, a concentric circle pattern, or the like, and is not particularly limited.

  It is preferable that the line and non-line portions of the line pattern and dot pattern are equally spaced.

  The angles of the different arrangement directions of the line drawing of the background image portion 12 and the line drawing of the message image portion 13 are preferably in the range of about 30 degrees to about 150 degrees.

  Preferably, when the angle of the arrangement direction of the line drawing of the background image portion 12 is 0 degree, the angle of the arrangement direction of the line drawing of the message image portion 13 is preferably about 90 degrees.

  For example, when three message image parts 13 are inserted into the second image 11 and the background image part 12 is set to 0 degree, the angle in the arrangement direction of the message image part 13 is set to about 45, 90, or 135 degrees. May be.

  In the line drawing of the background image portion 12 and the message image of the present embodiment, the line width of each drawing line is changed stepwise and / or continuously, and a latent image having an arbitrary gradation is obtained by tilting the printed matter. By appearing, the forgery prevention effect can be enhanced.

  When the printed matter of this embodiment is observed while being tilted continuously from directly above, the line image of this embodiment needs to have a swell in order to make the message image portion 13 provided in the second image 11 appear clearly. is there. It is desirable that the ink deposit of each line drawing in the background image portion 12 and the message image portion 13 is in the range of 10 μm to 150 μm. When the print of the ink is less than 10 μm, the message image portion 13 hardly appears clearly when the printed material is observed while being tilted continuously from directly above, and when it exceeds 150 μm, it is difficult to produce.

  The printing means used for printing in this embodiment is not particularly limited, but the first image 10 is preferably an offset printing technique. The second image 11 preferably uses an intaglio printing technique or a screen printing technique. Further, no special adjustment is required for adjustment of the printing press, and printing can be performed with general settings.

  Moreover, paper sheets, a plastic film, a metal, cloth, etc. can be used for a base material.

  Hereinafter, although a 2nd embodiment is described in detail using an example, the present invention is not limited to the range of these examples.

(Example 3)
A PS plate was produced with the design of the letter P, and the first image 10 as shown in FIG. 26 was printed by an offset printing method using green ink, and a printed matter of the first image 10 was obtained. The color difference meter was L * a * b * color system and L * was 93.35.

  Next, the image line design of the second image 11 as shown in FIG. 26 was performed using a computer. When the angle of the arrangement direction of the line drawing of the background image portion 12 is 0 degree, the line drawing of the message image portion 13 is 90 degrees, the line drawing of the background image portion 12 and the message image portion 13 is pitch width 200 μm, and the line width 100 μm. It was.

Based on the designed image line of the second image 11, a screen plate surface was prepared, and ink was prepared at the following blending ratio.

Composition of screen printing ink Pigment 10 parts by weight (SiO2 silica powder)
50 parts by weight of urethane acrylate (UX-4101 manufactured by Nippon Kayaku Co., Ltd.)
30 parts by weight of monomer (Nippon Kayaku PEG-400DA)
9 parts by weight of initiator (Irgacure 819 manufactured by Ciba Specialty Chemicals)
Inhibitor 0.5 part by weight (Methylhydroquinone manufactured by Tokyo Chemical Industry Co., Ltd.)
Antifoam 0.5 parts by weight (SC5540 manufactured by Toray Dow Corning Silicone)

  Using the obtained screen printing plate and screen ink, the first image 11 is overprinted on the printed matter of the first image 10 with a screen printing machine, cured with an ultraviolet irradiation device, and the implementation as shown in FIG. The printed material 16 of Example 3 was obtained.

  FIG. 28 shows a state in which the printed matter 16 of Example 3 is observed from directly above. As shown in FIG. 28, when the printed matter 16 is observed from directly above, the background image portion 12 and the message image portion 13 of the second image 11 cannot be identified with the naked eye. Since the second image 11 printed on the first image 10 was printed with a translucent ink, only the first image 10 could be seen through.

  FIG. 29A, FIG. 29B, FIG. 29C, and FIG. 29D show a state where the produced printed matter is observed while being tilted continuously from the X direction.

  FIG. 29A shows a case where the printed material is tilted by about 30 degrees. When this printed matter was tilted by about 30 degrees, the letter “P” in the first image 10 disappeared, and the letter “100” in the message image portion 13 in the second image 11 was confirmed as a positive image.

  FIG. 29B shows a case where the printed material is tilted by about 45 degrees. When this printed matter was tilted by about 45 degrees, it seemed as if the solid image 17 had nothing printed at first glance.

  FIG. 29C shows a case where the printed material is tilted by about 60 degrees.

  When this printed matter was tilted by about 60 degrees, the letter “P” in the first image 10 disappeared again, and the letter “100” in the message image portion 13 in the second image 11 was confirmed as a negative image.

  FIG. 29D shows a case where this printed matter is tilted by about 75 degrees. When this printed matter was tilted by about 75 degrees, the letter “P” in the first image 10 appeared again, and the letter “100” in the message image portion 13 in the second image 11 disappeared. Therefore, it was in the same state as observed from directly above shown in FIG. When tilted about 30 degrees in the Y direction, the letter “P” in the message image portion 13 was confirmed as a negative image, and when tilted about 60 degrees, it was confirmed as a positive image. Since the appearance of the image according to the observation angle varies depending on the light source, the present invention is not limited to the observation angle of the above embodiment.

Example 4
A second image 11 was printed using an ink prepared in the same manner as in Example 3 at the following blending ratio, and a printed matter according to Example 4 was obtained.

Composition of ink for screen printing Scale-like pigment 20 parts by weight (Plane-oriented pearl pigment manufactured by Merck Japan)
40 parts by weight of urethane acrylate (UX-4101 manufactured by Nippon Kayaku Co., Ltd.)
30 parts by weight of monomer (PEG-400DA manufactured by Nippon Kayaku Co., Ltd.)
9 parts by weight of initiator (Irgacure 819 manufactured by Ciba Specialty Chemicals)
Inhibitor 0.5 part by weight (Methylhydroquinone manufactured by Tokyo Chemical Industry Co., Ltd.)
Antifoam 0.5 parts by weight (SC5540 manufactured by Toray Dow Corning Silicone)

  When the printed matter of Example 4 was observed while being tilted continuously from the X direction or the Y direction, the message image portion 13 was clearly confirmed from the printed matter of Example 3.

(Reference Example 3)
A printed matter of Reference Example 3 was obtained using an ink prepared in the same manner as in Example 3 at the following blending ratio. (Solvent dry type)

Composition of ink for screen printing Scale-like pigment 20 parts by weight Pigment similar to Example 4 (planar orientation pearl pigment manufactured by Merck Japan Ltd.)
Solvent type varnish 79.5 parts by weight (SG720 manufactured by Seiko Advance)
Antifoam 0.5 parts by weight (SC5540 manufactured by Toray Dow Corning Silicone)

  When the printed matter of Reference Example 3 was observed from an oblique direction, the message image portion 13 could not be confirmed.

  Next, in order to determine the good brightness of the first image 10 and the good ink level of the second image 11, the second image 11 uses the same ink as in Example 4 to use the ink level. The first image 10 is prepared by changing the brightness, the sample is prepared, and the visibility test of the message image portion 13 and the first image 10 when the obtained printed material is observed while being tilted. A disappearance test was performed.

  Regarding the evaluation method, ○ indicates that the message image clearly changes from the negative image to the positive image, ○ indicates that the message image can be confirmed although it is not clear, and the message image indicates Those that were hardly confirmed or not confirmed at all were evaluated in three stages. The evaluation results are shown in FIGS. In addition, evaluation was made in three stages: ◯ when the first image 10 disappeared, △ when the first image 10 was not clear but disappeared, and x when the first image 10 did not disappear. The evaluation results are shown in FIGS.

  As is apparent from the evaluation results, it is understood that the ink pile of the second image 11 is desirably 10 μm or more.

  It can also be seen that the printed image of the first image 10 preferably has a brightness of 90 or more. Therefore, it can be seen that it is desirable that the first image 10 has a brightness of 90 or more, and the ink deposit of the second image 11 is 10 μm or more.

  In order to obtain a preferable line drawing pitch so that the background image portion 12 and the message image portion 13 of the second image 11 cannot be distinguished when the printed matter according to this embodiment is observed from directly above, the line pitch is changed. A sample was prepared, and the printed matter obtained was observed from directly above for a visibility test.

  Regarding the evaluation method, the background image portion 12 and the message image portion 13 cannot be distinguished from each other, ◯, the background image portion 12 and the message image portion 13 can be distinguished from each other, and the background image portion 12 and the message image portion. What can be distinguished from 13 was evaluated in three stages, x. Moreover, the visibility test of the message image part 13 when the printed material is tilted and observed was performed. Regarding the evaluation method, ○ clearly indicates that the message image has changed from a negative image to a positive image, △ indicates that the message image can be confirmed although it is not clear, and hardly confirms it. A thing or a thing which cannot be confirmed at all was evaluated in three stages. The evaluation results are shown in FIG.

  It was found that the line widths of the line image of the background image portion 12 and the line image of the message image portion 13 are preferably in the range of 30 μm to 1000 μm.

  The present invention is not limited to the above embodiments and examples, and various modifications can be made within the scope of the technical idea described in the claims.

  According to the second embodiment, Examples 3 and 4, when the printed matter of the invention is observed from directly above, the background image portion and the message image portion of the second image composed of line drawings are visually confirmed. Since only the first image can be confirmed and the printed material is observed while being tilted continuously from directly above, the message image of the second image is switched from the negative image to the positive image or from the positive image to the negative image. Since the first image gradually becomes difficult to confirm with the naked eye and appears again, anyone can easily determine authenticity on the spot without using an expensive authenticity determination device. Can do.

  Furthermore, by specifying the pitch of the line drawing constituting the second image, the height of the line drawing, the pigment, etc., and observing the printed material while being tilted continuously from directly above, the latent image of the second image is It can be confirmed by switching from a negative image to a positive image or from a positive image to a negative image continuously and clearly, and it is excellent in visual effect and can be easily determined as authentic.

  In addition, there is no need to make the ink height higher than necessary, and there is no problem such as the influence on the back side of the printing surface and loss of the effect due to pressurization because there is no processing such as embossing. Since the two steps of printing and embossing are not required, work efficiency can be improved.

  Furthermore, the printed matter in which the second image is prepared using an ink containing an optically changing pigment such as a pearl pigment does not impair the optical effect when the printed matter is observed while being tilted continuously from directly above. The degree of change of the message image portion from the negative image to the positive image or from the positive image to the negative image becomes remarkable, and the forgery prevention effect is improved. In addition, it is excellent in the anti-copying effect peculiar to optically changing pigments and has a print of ink because the image line itself has a heap of ink.

FIG. 2 is an enlarged plan view showing a line drawing configuration of a printed material according to the first embodiment of the present invention. Sectional drawing which expands and shows the longitudinal cross section in alignment with the X-X 'line | wire in FIG. The top view which expands and shows an image line when the ink with a specular gloss is used in the printed matter by the said 1st Embodiment. Explanatory drawing which showed typically the optical color change in the pearl printed matter which performed printing with few heaps using the ink generally used including scaly pigments, such as a pearl pigment. The top view which expands and shows the printed matter obtained by using scaly pigments, such as a pearl pigment, and combining the image line with few ink prints. Sectional drawing which expands and shows the longitudinal cross section in alignment with the X-X 'line | wire in FIG. 5A. Sectional drawing which expands and shows distribution of the scale-like pigment which performed the surface treatment in the said 1st Embodiment. Explanatory drawing which expands and shows the state which irradiates light from A direction to the printed matter which printed the line drawing 5 shown by FIG. 3 using the scaly pigment which performed the water-repellent treatment from the A direction. Explanatory drawing which expands and shows the state which applies the light from A direction to the printed matter which printed the line drawing 4 shown by FIG. 3 using the scaly pigment which performed the water-repellent treatment from the A direction. The top view which expands and shows the basic composition of the printed matter by the said 1st Embodiment. The top view which expands and shows a mode that the printed matter was seen from right above. The top view which expands and shows a mode that the printed matter by the said 1st Embodiment was observed from the diagonal at a shallow angle. The top view which expands and shows a mode that the printed matter by the said 1st Embodiment was observed from diagonally at a deep angle. Explanatory drawing which shows the result of having tested the relationship between the thickness of the image line which the heap of ink brings, and the visibility of a message image. The top view which expands and shows the image line structure in the printed matter by the 2nd Embodiment of this invention. Sectional drawing which expands and shows the pigment distribution state in the membrane | film | coat of the ink containing the pigment which does not have planar orientation. Sectional drawing which expands and shows the pigment distribution state in the film | membrane of the ink of the ink containing the pigment which has planar orientation. Explanatory drawing for demonstrating typically the optical color change of the pearl printed matter with few ink piles. The top view of the printed matter which printed the image line 7 and the image line 8 with the ink containing the scale-like pigment which gave the water-repellent and oil-repellent treatment so that it might carry out plane orientation. FIG. 17B is a sectional view showing a longitudinal section along the line P-P ′ in FIG. 17A. FIG. 17A is an enlarged plan view showing the image line 7 shown in FIG. 17A, which is printed using a scaly pigment that has been subjected to water and oil repellency treatments, and is observed from the direction B by applying light from the A direction. . FIG. 17A is an enlarged cross-sectional view showing the image line 8 shown in FIG. 17A using a scaly pigment that has been subjected to water and oil repellency treatments, and observing from the direction B by applying light from the A direction. . Explanatory drawing which showed the visibility of the 1st image when the printed matter by the said 2nd Embodiment was observed from different angles, and a 2nd image. Explanatory drawing which showed the visibility of the 1st image when the printed matter by the said 2nd Embodiment was observed from different angles, and a 2nd image. Explanatory drawing which showed the visibility of the 1st image when the printed matter by the said 2nd Embodiment was observed from different angles, and a 2nd image. The top view which shows an example of a structure of the printed matter by the said 2nd Embodiment. FIG. 21 is a cross-sectional view taken along the line PP ′ in FIG. 21 when the second image in the printed material according to the second embodiment is printed using a translucent ink containing an optically variable pigment having planar orientation. Sectional drawing which expands and shows. The top view which shows the visibility of the 1st, 2nd image when seeing the printed matter from right above. Explanatory drawing which shows the visibility of the 1st, 2nd image when seeing the same printed matter by changing the angle in the X direction. Explanatory drawing which shows the visibility of the 1st, 2nd image when seeing the same printed matter by changing the angle in the X direction. Explanatory drawing which shows the visibility of the 1st, 2nd image when seeing the same printed matter by changing the angle in the X direction. Explanatory drawing which shows the visibility of the 1st, 2nd image when seeing the same printed matter by changing the angle in the X direction. Explanatory drawing which shows the visibility of the 1st, 2nd image when changing the angle in the Y direction when seeing the printed matter. Explanatory drawing which shows the visibility of the 1st, 2nd image when changing the angle in the Y direction when seeing the printed matter. Explanatory drawing which shows the visibility of the 1st, 2nd image when changing the angle in the Y direction when seeing the printed matter. Explanatory drawing which shows the visibility of the 1st, 2nd image when changing the angle in the Y direction when seeing the printed matter. The top view which shows the printed matter on which the 1st image was printed. The top view which shows an example of a structure of the printed matter by the said 2nd Embodiment. The top view which shows the visibility of the 1st, 2nd image when observing the printed matter from right above. Explanatory drawing which shows the visibility of the 1st, 2nd image when viewing the same printed matter from a different angle. Explanatory drawing which shows the visibility of the 1st, 2nd image when viewing the same printed matter from a different angle. Explanatory drawing which shows the visibility of the 1st, 2nd image when viewing the same printed matter from a different angle. Explanatory drawing which shows the visibility of the 1st, 2nd image when viewing the same printed matter from a different angle. Explanatory drawing which shows the result of having changed the mark of the ink (cyan system) of the image line in the 2nd image, and having tested the visibility of the message image. Explanatory drawing which shows the result of having changed the height of the ink (yellow type) of the image line in the 2nd image, and having tested the visibility of the message image. Explanatory drawing which shows the result of having tested the visibility of the message image by changing the scale of the ink (magenta system) of the image line in the second image. Explanatory drawing which shows the result of having changed the scale of the ink (green type) of the image line in the 2nd image, and having tested the visibility of the message image. Explanatory drawing which shows the result of having tested the visibility of the message image by changing the scale of the ink (black type) of the image line in the 2nd image. Explanatory drawing which shows the result of having tested the visibility of a message image by changing the brightness (cyan system) of a 1st image. Explanatory drawing which shows the result of having tested the visibility of a message image by changing the brightness (yellow system) of a 1st image. Explanatory drawing which shows the result of having tested the visibility of a message image by changing the brightness (magenta system) of a 1st image. Explanatory drawing which shows the result of having tested the visibility of a message image by changing the brightness (green system) of a 1st image. Explanatory drawing which shows the result of having tested the visibility of a message image by changing the brightness (black system) of a 1st image. It is explanatory drawing which shows the result of having tested the visibility of the background image part and message image part in a 2nd image by changing a line pitch.

Claims (18)

A printed material in which a first image is printed on a surface of a substrate and a second image is printed on the first image.
The first image has at least a region having an L * a * b * color system in which L * is 90 or more as measured by a color difference meter,
Authenticity discrimination characterized in that the second image has a line drawing printed so as to be raised by a translucent ink having a specular gloss or a translucent ink containing a pigment having a planar orientation Possible prints. When the printed matter is observed from the direction in which the total light amount obtained by adding the specularly reflected light amount and the diffused light amount is approximately equal between the first image and the second image, the first image is viewed by the naked eye. Is more clearly visible than the second image,
When the total amount of light is observed by gradually changing the angle of the printed matter from a substantially equal direction to a different direction between the first image and the second image, the first image gradually becomes visible to the naked eye. The printed matter capable of authenticating authenticity according to claim 1, wherein the printed matter becomes difficult to be visually recognized and is then visually recognized again.   The authenticity can be determined according to claim 1 or 2, wherein the ink used for the second image includes at least one of a scale pigment, a metal powder pigment, a glass flake, and a cholesteric liquid crystal pigment. Prints. The second image includes a background image portion and at least one message image portion,
The line drawing includes a first line drawing included in the background image portion and a second line drawing included in the message image portion and having a different arrangement direction from the first line drawing,
When the printed matter is observed from the direction in which the total light amount obtained by adding the specular reflection light amount and the diffuse light amount is substantially equal between the first image and the second image, the light amount included in the second image is included. The background image part and the message image part can hardly be identified with the naked eye,
When the overall light quantity is observed by gradually changing the angle of the printed material from a substantially equal direction to a different direction between the first image and the second image, the message image in the second image is The negative image is changed to a positive image or a positive image to a negative image with the naked eye, and the first image gradually becomes difficult to be visually recognized with the naked eye, and is then visually recognized again. The printed matter according to any one of 1 to 3, wherein the authenticity can be determined.   5. The printed matter capable of authenticating authenticity according to claim 4, wherein each of the first line drawing and the second line drawing includes a line pattern or / and a dot pattern.   6. The printed matter capable of authenticating authenticity according to claim 4, wherein the first line drawing and the second line drawing each have a line width in a range of 30 μm to 1000 μm.   7. The printed matter capable of authenticating authenticity according to claim 4, wherein the height of each of the first line drawing and the second line drawing is in the range of 10 μm to 150 μm.   The ink used for printing the first line drawing and the second line drawing is a UV curable ink, an electron beam curable ink, or a solvent-type ink. Printed material that can be distinguished.   The authenticity determination according to any one of claims 1 to 8, wherein the ink is subjected to a surface treatment for imparting water repellency and oil repellency in order to improve planar orientation of the pigment. Possible prints. A method for producing a printed material in which a first image is printed on a surface of a base material and a second image is printed on the first image, and the authenticity can be determined.
The first image is printed on at least a part so as to have an area where L * is 90 or more in the L * a * b * color system when measured with a color difference meter;
Authenticity discrimination characterized in that the line image contained in the second image is printed so as to be raised with a translucent ink having a specular gloss or a translucent ink containing a pigment having a planar orientation. Possible method of producing printed matter. When the printed matter is observed from the direction in which the total light amount obtained by adding the specularly reflected light amount and the diffused light amount is approximately equal between the first image and the second image, the first image is viewed by the naked eye. Is more clearly visible than the second image,
When the total amount of light is observed by gradually changing the angle of the printed matter from a substantially equal direction to a different direction between the first image and the second image, the first image gradually becomes visible to the naked eye. The method for producing a printed matter capable of authenticating authenticity according to claim 10, wherein the first image and the second image are printed so that the first image and the second image can be visually recognized again.   The authenticity according to claim 10 or 11, wherein the second image is printed using an ink containing at least one of a scale pigment, a metal powder pigment, a glass flake, and a cholesteric liquid crystal pigment. A method for producing prints that can be distinguished. The second image includes a background image portion and at least one message image portion,
The line drawing includes a first line drawing included in the background image portion and a second line drawing included in the message image portion and having a different arrangement direction from the first line drawing,
When the printed matter is observed from the direction in which the total light amount obtained by adding the specular reflection light amount and the diffuse light amount is substantially equal between the first image and the second image, the light amount included in the second image is included. The background image part and the message image part can hardly be identified with the naked eye,
When the overall light quantity is observed by gradually changing the angle of the printed material from a substantially equal direction to a different direction between the first image and the second image, the message image in the second image is The first image is visually recognized by the naked eye while changing from a negative image to a positive image or from a positive image to a negative image, and the first image gradually becomes difficult to visually recognize with the naked eye, and then visually recognized again. The method for producing a printed matter capable of authenticating authenticity according to claim 10, wherein the image and the second image are printed.   14. The method for producing a printed matter capable of authenticating authenticity according to claim 13, wherein the first line drawing and the second line drawing are printed so as to include a line pattern or / and a dot pattern, respectively.   The method for producing a printed matter capable of authenticating authenticity according to claim 13 or 14, wherein the first line drawing and the second line drawing are printed such that the line width is in a range of 30 µm to 1000 µm. .   The authenticity according to any one of claims 13 to 15, wherein the first line drawing and the second line drawing are printed so that the height of each rise is in a range of 10 µm to 150 µm. A method for producing prints that can be distinguished.   17. The printing of the first line drawing and the second line drawing is performed using UV curable ink, electron beam curable ink, or solvent-based ink. A method for producing a printed material that can be authenticate.   The authenticity determination according to any one of claims 10 to 17, wherein the ink is subjected to a surface treatment for imparting water repellency and oil repellency in order to improve planar orientation of the pigment. Possible method of producing printed matter.

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