JPH0716461Y2 - Hidden printed matter - Google Patents

Description

[Detailed description of the device]

 Purpose of devising

[Industrial applications]

The present invention relates to an improvement of a printed product having a hidden pattern which shows a hidden pattern of a base by removing the hidden layer.

2. Description of the Related Art Hidden picture printed matter is produced by printing a picture on a base material sheet by offset printing or other printing means, and providing a concealing layer thereon by a printing method such as gravure printing. Often, a release layer is printed in between to facilitate removal of the hiding layer. If the hiding layer is thin, the unevenness of the printing of the underlying pattern can be seen, and the purpose of the hidden pattern cannot be achieved. Therefore, the hiding layer must be thick. Therefore, offset printing, which can form only a thin printing layer, is unsuitable for forming the concealing layer, and it is necessary to adopt the above-described means such as clavia printing, silk screen printing, and foil stamping. However, if an attempt is made to improve the printing registration accuracy by these methods, the printing speed will be reduced and the cost will be increased.

[Problems to be solved by the device]

The object of the present invention is to improve the current state of the art as described above, and even if the concealing layer is formed by means such as offset printing, which has a high printing speed and high printing registration accuracy, the hidden pattern of the underlying layer cannot be seen. To provide such printed matter, thereby increasing productivity and reducing costs. Device configuration

[Means for solving problems]

The hidden pattern print of the present invention comprises a hidden sheet print 2 and a transparent tint block print 3 on a base sheet 1 in this order.
Alternatively, the concealing layer 5 is provided in the reverse order, and the concealing layer 5 is provided on the surface of the concealing layer to conceal the color tone of the concealing pattern, and the unevenness of the concealing pattern is made inconspicuous by printing a transparent tint block. The order of the pattern print 2 and the transparent tint block 3 may be the order as shown in FIGS. 1 and 2, or the third order.
The order may be reversed as shown in the figure. In any case, as shown in each drawing, it is preferable to provide the peeling layer 4 at a portion closer to the surface than the pattern print 2. The transparent tint block may be formed by offset printing or any other method using an ordinary mixed ink of varnish such as rosin phenol and wax. The same applies to the release layer.
For the transparent tint block, any pattern such as letters and geometric patterns can be selected.

[Action]

In the hidden pattern print of the present invention, the hidden layer hides the color tone of the hidden pattern, and the transparent tint block makes the irregularities of the hidden pattern inconspicuous. Can't know what is. Therefore, it is not necessary to print the hiding layer thickly. Peeling off the hiding layer and seeing the print of the pattern are not obstructed not only when the transparent tint pattern is below it but also when it is above it.

Example 1 An oil-based offset ink for printing a pattern was prepared with the following composition. Yellow: Disazo yellow 15%, rosin phenol 65%,
Varnish 20% Red ... Carmine 6B 25%, Rosinphenol 55%, Varnish
20% eye color: Cyanine blue 20%, rosin phenol 60%,
Varnish 20% Black ... Carbon black 20%, Rosin phenol 55%,
Varnish 25% Rosinphenol 90% and varnish 10% were blended to prepare a transparent tint block and an oil-based offset ink for a release layer. An ultraviolet curable ink for a hiding layer was prepared with the following composition. Silver: 20% aluminum powder, 70% modified acrylic resin,
Sensitizer 10% Black ... Carbon black 20%, Modified acrylic resin 60%,
Sensitizer 20% Using the above three types of oil-based offset inks, a sheet-fed offset 6-color printing machine prints a 4-color pattern on art paper,
A transparent tint block and a release layer were formed in this order. The above-mentioned ultraviolet curable ink was printed on this release layer by a sheet-fed offset two-color printing machine, and irradiated with ultraviolet rays to form a hiding layer. In the obtained hidden pattern printed matter, neither the color tone nor the unevenness of the printed pattern was visible on the hiding layer.

Example 2 Titanium white 30%, modified acrylic resin 45% and sensitizer 25% were blended to prepare a white UV curable ink for a hiding layer. Using the same printing ink as in Example 1, a sheet-fed offset 4-color printing machine was used to print a 4-color pattern on the art paper. The same ink as in Example 1 was used to print this pattern,
After forming a transparent tint block and a release layer in this order on a sheet-fed offset 4-color printing machine, two-color printing was performed on the release layer using the silver-colored ink of Example 1 and the white UV curable ink described above. Then, the hiding layer was formed by irradiating ultraviolet rays. Also in this printed matter, it was not possible to see the pattern printing without removing the hiding layer. Effect of the Invention In the printed matter with the hidden pattern of the present invention, it is not necessary to print the hiding layer thickly, and therefore the printing means is not limited. Since offset printing with high printing speed and high registration accuracy is sufficient, productivity is improved and cost is reduced. This effect is further enhanced by consistently performing offset printing in all processes.

[Brief description of drawings]

1, FIG. 2 and FIG. 3 are schematic cross-sectional views showing various aspects of the construction of the hidden pattern printed matter of the present invention. 1 ... Substrate sheet 2 ... Printing a pattern 3 ... Transparent tint pattern 4 ... Peeling layer 5 ... Hiding layer

Claims (2)

[Scope of utility model registration request] 1. A transparent copy-forgery-inhibited pattern in which a hidden pattern print 2 and a transparent copy-forgery-inhibited pattern print 3 are provided on a base sheet 1 in this order or in the reverse order, and a concealing layer 5 is provided on the surface. Hidden pattern printed matter characterized by making the irregularities of the hidden pattern inconspicuous by printing. 2. The hidden design printed matter according to claim 1, wherein a release layer 4 is provided in a portion closer to the surface than the design printing 2.