JPH02127077A - Combination printing method - Google Patents

Abstract

PURPOSE:To print a sophisticated design completely onto the same article to be printed by intaglio-printing a solid or continuous design onto a pattern design composed of dots or fine lines before the ink of offset printing is absorbed to a blank form and dried after the pattern design is offset-printed. CONSTITUTION:Intaglio printing having a solid or continuous design P2 is conducted immediately before ink on a body to be printed is dried after a pattern design P1 consisting of dots or fine lines is offset-printed by the offset ink of dry offset or wet offset. Accordingly, offset printing capable of printing at low printing pressure and intaglio printing requiring extremely high printing pressure are performed to the same body to be printed with the printing of a sophisticated design, and a pattern design P3 is printed into an intaglio design.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a printing method that is mainly used for banknotes, passports, securities, cards, etc. that require prevention of forgery and falsification. It is something.

[Conventional technology]

Banknotes, passports, securities, cards, etc. are required to be difficult to forge or alter due to their purpose and nature. As visual counterfeit prevention measures, there are known methods such as applying a latent image pattern, utilizing the density of halftone dots, and applying a moiré pattern. Printed matter incorporating these patterns makes it easy to distinguish between counterfeit tickets and genuine bills, and is effective as a counterfeit prevention measure.

The above-mentioned printed matter is a printed matter in which a latent image pattern is imprinted as a pattern consisting of minute dots or lines such as halftone dots, parallel lines, and other background patterns.

[Problem to be solved by the invention]

Printed matter that incorporates the anti-counterfeiting measures described in the prior art section requires high accuracy in mounting the printing plate, making printing work extremely difficult. Furthermore, when printing intaglio printing, which requires extremely high printing pressure, and offset printing, which requires low printing pressure, on the same printed material, it was impossible to perfectly match the elaborate patterns. .

The present invention uses a completely different method to obtain these printed materials, and combines intaglio printing, which requires very high printing pressure, and offset printing, which requires low printing pressure, onto the same substrate to create complete and elaborate patterns. The purpose of this paper is to provide a new printing method that can perform various types of printing.

[Means to solve the problem]

In the present invention, after dry offset or wet offset printing of a tint block pattern consisting of halftone dots or thin lines, a solid or continuous pattern is printed on the tint block pattern at a very high printing pressure before the ink is absorbed into the paper and dries. By performing the required intaglio printing, it takes advantage of the fact that the intaglio ink does not sit on top of the undried dry offset or wet offset ink.

Due to the above, intaglio ink is not placed on the tint pattern consisting of halftone dots or fine lines, but only on the surface of the other printing material, and intaglio printing requires extremely high printing pressure. This allows printing and offset printing, which can be printed at low printing pressure, to perfectly match elaborate patterns on the same printing material.

In order to perform intaglio printing immediately after the above-mentioned dry offset or wet offset printing, before the ink on the printing material has dried, an offset of an offset Sammel intaglio rotary printing machine, an intaglio combination printing machine or an offset printing machine is used. This is made possible by using a printing machine that has an intaglio printing unit installed in a part of it.

In order to perfectly match the elaborate patterns of the above-mentioned intaglio printing, which requires very high printing pressure, and offset printing, which can be printed with low printing pressure, on the same printing material, it is necessary to use ordinary offset ink. It is better to dispense more than normal printing conditions so that the intaglio ink that is printed afterwards does not get on top of it.

In addition, in order to make the intaglio ink sit on top of the offset ink, the intaglio ink containing the lipophilic offset ink and a hydrophilic solvent such as ethylene glycol ester, which has repulsion properties, can be used. Printed matter with excellent anti-counterfeiting properties can be obtained in which intaglio ink does not appear on the background pattern printed with the .

Alternatively, after printing a tint pattern consisting of halftone dots or fine lines using a light- or radiation-drying offset ink containing a silicone-based or fluorine-based resin liquid that is repellent to both water and oil as an offset ink, By drying with an ultraviolet irradiation machine and then using an intaglio ink containing the above-mentioned hydrophilic solvent, the intaglio ink does not get on top of the tint pattern consisting of halftone dots or fine lines, and it can be printed on other printing materials. By taking advantage of the fact that intaglio ink is applied only to the surface, it is possible to obtain a printed matter with excellent anti-counterfeiting properties in which intaglio ink does not appear on the tint pattern printed with offset ink.

[For production]

Immediately after printing a tint pattern consisting of halftone dots or thin lines using the above dry offset or wet offset offset ink, before the ink on the printing medium has dried, intaglio printing with a solid or continuous pattern is performed immediately. Offset printing allows printing with low printing pressure,
Intaglio printing, which requires very high printing pressure, can be completely printed on the same printing material by imprinting elaborate patterns.

〔Example〕

To explain the embodiment with reference to the drawings, Fig. 1 is a schematic diagram of the offset printing section and the intaglio printing section of an offset Sammel intaglio rotary printing machine, and includes an impression cylinder (2), an offset plan cylinder (3), and an offset plate cylinder. (4), an intaglio printing cylinder (5), an intaglio inking roller (6), and a wiping device (7). Fig. 2 is a schematic diagram of a printing press in which an intaglio printing unit 03) is installed in the bore of an offset rotary printing machine, and is composed of an impression cylinder (2a), an offset plan cylinder (3), and an offset plate cylinder (4). The intaglio printing unit consists of an offset rotary printing press, an impression cylinder (2b), an intaglio cylinder (5), an intaglio inking roller (6), and a wiping device (force).

To actually carry out the present invention, an offset Sammel intaglio rotary printing press having the printing mechanism shown in FIG. Printing is carried out using a printing machine incorporating an intaglio printing unit l-(Bl) in each printing machine hole.

[Example 1] - In an offset Sammel intaglio rotary printing machine having the printing mechanism shown in Fig. 1 (or a dry offset intaglio rotary printing machine having a similar printing mechanism), a printing machine consisting of halftone dots and thin lines as shown in Fig. 3 is used. By printing the tint pattern (Pl) with four colors of ordinary dry offset ink and immediately performing intaglio printing with the solid or continuous pattern (P2) shown in Fig. 4, a pan as shown in Fig. 5 is created. Furthermore, it was possible to print a tint block pattern (P3) consisting of halftone dots and fine lines by completely overprinting a continuous intaglio pattern.

The intaglio ink used should preferably be one that does not sit on top of the offset ink, and by adding a hydrophilic solvent such as ethylene glycol monoethyl ether to increase its repulsion with the offset ink, it is suitable for actual printing. It became an intaglio ink.

The most suitable printed matter was obtained when coated paper was used as the paper used in this case, but even paper without a coating layer, such as high-quality paper, was sufficient and perfectly matched printed matter was obtained.

[Example 2] Intaglio printing in the holes of an offset rotary printing machine with the printing mechanism shown in Figure 2) In a printing machine incorporating CBI, a background pattern (Pl
) with four colors of normal dry offset ink, and then immediately perform intaglio printing with a solid or continuous pattern (P2) to create halftone dots and Background pattern consisting of thin lines (P
3) was able to be printed.

[Example 3] Using the same example 2 in which an ultraviolet drying device (not shown) was installed in the hole of the offset rotary printing machine, silicone-based paint additives (for example, Toshiki Silicone KK 5H29PA
) is added to create a tint pattern (
Pl) is printed, followed by a flat or continuous pattern (Pl).
By performing intaglio printing with 2), it was possible to print a tint pattern (P3) consisting of halftone dots and fine lines in a solid or continuous intaglio pattern, completely interprinted.

〔Effect of the invention〕

The printing method of the present invention allows products such as banknotes, passports, and securities that require measures to prevent counterfeiting and tampering to print with intaglio printing patterns that conventionally require very high printing pressure, and with low printing pressure. The printing method of the present invention has made it possible to completely print the combinations of patterns that can be used because it was not possible to completely print the offset background patterns that can be used. It has become possible to print extremely complex combinations of offset background patterns and intaglio patterns.

[Brief explanation of the drawing]

FIG. 1 is a partial view showing an offset plate cylinder, an intaglio plate cylinder, and a common impression cylinder portion of an offset Sammel intaglio rotary printing press. FIG. 2 is a schematic diagram of a printing press in which an intaglio printing unit is incorporated into an offset rotary printing press. FIG. 3 shows an example of an offset background pattern, FIG. 4 shows an example of an intaglio pattern that is overprinted, and FIG. 5 shows an example of an offset background pattern and an intaglio pattern that is overprinted. l...Paper feeding section, 2, 2a, 2b...impression cylinder, 3.
...Offset plan cylinder, 4...Offset plate cylinder, 5
... Intaglio cylinder, 6... Intaglio inking roller, 7... Wiping device, 8... Paper transfer cylinder, 9... Paper, A... Off Cerato rotary printing press, B... Intaglio printing unit. Figure 2

Claims (3)

[Claims] (1) When patterns created by different printing methods are overprinted, the ink printed later does not overlap the ink printed earlier in the overlapping part of the pattern, which is a feature that allows for precise printing of patterns. A combination printing method. (2) First, a background pattern is printed on the printing material by dry offset printing or wet offset printing, and by immediately intaglio printing a pattern different from the background pattern while the ink is still dry, printing can be done later. 2. The combination printing method according to claim 1, which takes advantage of the fact that the applied intaglio ink does not rest on the previously printed offset ink. (3) By first printing a background pattern on the printing material using dry offset or wet offset ink that has strong repulsion against other inks, and then printing a pattern different from the background pattern using intaglio printing. 2. The combination printing method according to claim 1, which takes advantage of the fact that intaglio ink printed later does not rest on offset ink printed earlier.