JPH1158923A - Printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable printing achieving the enhancement of productivity and the reduction of spoilage without losing merits of waterless printing, being in good condition and sufficiently satisfying request quality in friction resistance/ light fastness/chemical resistance in a waterless offset printing method using a dipping water-free printing plate. SOLUTION: In a waterless offset printing method using a dampening water- free printing plate 100, UV ink, IR (infrared curable) ink and EB (electron curalable ink) are used to perform printing. Therefore, when printing is performed by a sheet-fed press, ink is immediately dried by applying ultraviolet rays, infrared rays or electron beam from an irradiation apparatus matched with each of inks on a printing press immediately after printing and printing can be performed without receiving the effect of in-slip aptitude and dry-down. Therefore, productivity and workability are enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterless offset printing method using no dampening solution.

[0002]

2. Description of the Related Art As a lithographic printing plate used for offset printing, a printing plate (hereinafter, referred to as a PS plate) that performs printing using a dampening solution and a printing plate that does not require a dampening solution are generally known. However, for example, as shown in FIG. 1, an ink repelling layer 1 having no affinity for ink and an ink receiving layer 2 having high affinity for ink are laminated on a substrate 4 via an adhesive layer 3, The fountain solution-free printing plate 100 having a configuration in which the image area 5 is formed by the exposed portion 2a of the ink receptive layer which appears due to the removal of the required portion (image area) of the ink repellent layer 1, balances the ink and the fountain solution. It has the advantage that it is free from any work relating to the dampening solution such as adjustment, and that there is no risk of print quality deterioration and variation caused by the emulsification of the ink in contact with the dampening solution.

In the printing plate 100 requiring no dampening solution, the ink supplied onto the printing plate does not adhere to the ink repelling layer 1 but adheres only to the image area 5 composed of the exposed portion 2a of the ink receiving layer. Therefore, it is a so-called planographic printing plate in which the remaining ink repellent layer 1 is a non-image area 6 and the ink receiving layer exposed area 2a is an image area 5, which is a so-called planographic printing plate. When the ink is transferred from the plate to the blanket, the ink does not spread even when subjected to the printing pressure of the blanket and the plate, and transfers from the plate to the blanket almost according to the shape of the image area 5, and is generally called a mechanical dot gain. There is also an advantage that the dot thickness is greatly improved.

However, the printing plate 1 of the planographic printing plate requiring no dampening solution is used.
In offset printing using 00, because of its plate structure,
Compared to the PS plate, the ink film thickness is large and high-density printing reproduction can be performed. However, on the other hand, the drying property of the ink is reduced, and the rotary press is liable to generate a friction. Similarly, in a sheet-fed printing press, the suitability for stacking is deteriorated, the back fogging occurs, and the ink drying time is prolonged, thereby lowering the productivity. In addition, it has been pointed out that the so-called dry-down phenomenon, in which the printed matter having a good condition immediately after printing is dried and the density is reduced and the condition becomes shallow immediately after printing, is emphasized because the ink film thickness is increased.

[0005] Offset printing using a printing plate requiring no dampening solution is performed by using a heat-polymerizable ink or an oxidation-polymerizable ink as an ink. However, publications and pamphlets such as magazines and paperback books are particularly used. Although not a problem, it has been pointed out that the performance of the ink such as rubbing resistance, light resistance and chemical resistance is not sufficient in a food package or a POP for in-store advertising.

In water-based printing using a conventional PS plate, a method of printing using UV ink has been established in order to improve the above drawbacks. In this case, however, a thermosetting ink and an oxidative polymerization type are used. Compared to ink, the ink is more likely to be emulsified, so there is a great risk of print quality deterioration and variation, and considerable skill is required of the operator.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an offset printing method using a planographic printing plate that does not require dampening water, which improves the productivity by improving the ink drying property, improves the printing workability by reducing the dry down, and improves the durability of the printed matter. An object of the present invention is to provide a printing method capable of improving friction, light resistance, chemical resistance, and the like.

[0008]

In order to achieve the above object, according to the present invention, first, a required portion of an ink repellent layer laminated on an ink receiving layer is removed to expose the ink receiving layer. In a waterless offset printing method using a fountain solution unnecessary printing plate that forms an image portion by a part,
The printing method is characterized by printing using UV ink, IR ink, and EB ink.

In a second aspect of the present invention, the printing method according to the first aspect is characterized in that, immediately after printing, ultraviolet rays, infrared rays, and electron beams are radiated from a radiation device suitable for each ink on a printing press and dried. It is what it was.

According to a third aspect of the present invention, in the printing plate requiring no dampening solution, a required portion of the ink repellent layer laminated on the ink receiving layer is removed by a laser based on digital image data. The printing method according to claim 1 or 2.

Here, the UV ink is an ultraviolet curable ink, the IR ink is an infrared curable ink, and the EB ink is an electron beam curable ink.

[0012]

According to the printing method of the present invention, there is provided a waterless offset printing method using a printing plate requiring no dampening solution.
Since printing is performed using R ink and EB ink, when printing with a sheet-fed printing press, immediately after printing, irradiate ultraviolet rays, infrared rays, and electron beams on the printing press from an irradiation device suitable for each ink. As a result, the ink is immediately dried, and printing can be performed without being affected by the suitability for stacking and the dry-down, so that productivity and workability can be improved.

Further, since the printed matter obtained by the printing method of the present invention uses UV ink, IR ink and EB ink, the rubbed, light- and light-fastness of the printed matter is higher than that of the oxidative polymerization and heat polymerization type inks. Chemical properties are improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. The following embodiments do not limit the technical scope of the present invention.

[0015]

【Example】

<Example 1> The printing method of the present invention relates to a waterless offset printing method using a printing plate that does not require dampening solution.
Printing is performed using R ink and EB ink.

As the printing plate 100 requiring no dampening solution, for example, a waterless planographic plate (trade name: TAP plate) manufactured by Toray Industries, Inc. is used, and any one of UV ink, IR ink, and EB ink can be used. Good, but most popular,
In addition, FD Aquares FC manufactured by Toyo Ink Mfg. Co., Ltd., which is a UV ink, was used because of its low cost. In addition, UV
Due to the properties of the ink, it is necessary to use a special plate cleaning liquid and a roller cleaning liquid having a higher ink dissolving power than when using a normal thermosetting ink or an oxidative polymerization ink. However, when such a plate cleaning liquid and a roller cleaning liquid are used, silicone, which is a main component of the ink repellent layer 1 of the immersion-free printing plate 100, is destroyed due to its dissolving power and low volatility, and soiling and image stains on printed matter. Poor reproduction of the line portion occurs.

Accordingly, the printing method of the present invention is disclosed in Japanese Patent Application No. Hei.
The plate cleaning liquid and the roller cleaning liquid disclosed in JP-A-334105 and JP-A-8-313779 were used. The plate washing liquid and the roller washing liquid can be washed without affecting the silicone of the ink repellent layer 1 of the printing plate 100 requiring no dampening solution.

When printing was performed with the above-mentioned material using a sheet-fed printing press, the ink was dried when the paper came out of the feeder portion. Also, the printing of the back surface can be performed immediately after the printing of the front surface, and the productivity has been greatly improved. The improvement in productivity depends on the lot of printed matter, but the effect is more significant as the lot becomes smaller. For example, in the case of 5,000 lots, the printing time for the front and back sides can be reduced by 6 hours.

In addition, since it is not affected by dry-down, the paper to be printed can be immediately stacked on the feeder and used as a thickening paper, and the state of the ink does not change even when the printing machine is stopped. A printed matter having a good condition could be obtained with almost no occurrence of.
Furthermore, the obtained printed matter sufficiently satisfies the required quality in terms of rub resistance, light resistance and chemical resistance.

Example 2 Printing was performed using the same ink as in Example 1 using a QUICKMASTER DI-46 manufactured by Heidelberg as a printing machine. Here, an example of a digital workflow for printing using QUICKMASTER DI-46 will be briefly described with reference to FIG.

The input may be performed by separating the color with a scanner as in the prior art, or by using a digital camera or the like. However, the input is performed using digital data, and Macintosh (a trademark of Apple Computer Inc., USA) or W
Windows (Microsoft Corpora, USA)
after collecting by DTP such as Tion's trademark)
(Raster Image Processor) to perform data conversion. Using the data converted by the RIP, the QUICKMASTER DI-46 uses a laser on a printing machine to generate the QUICKMASTER DI.
The printing plate and printing can be performed by removing the ink repellent layer 1 laminated on the ink receiving layer 7 of the fountain solution-only plate 200 for -46.

The printed matter obtained by this printing method was in good condition as in Example 1.

The QUICKMASTER DI-4
In the printing using No. 6, it took 2.5 days at the minimum to finish all lines of plate collection, printing and processing after submitting the print data, but this printing method shortens it to 2 days The delivery time was greatly reduced.

[0024]

As described above, according to the printing method of the present invention, it is possible to adjust the supply balance between ink and fountain solution in waterless printing using a fountain solution-free printing plate, and to emulsify the ink. Improve productivity without losing the advantages of eliminating the problems such as reduced print quality that occur, and eliminating the advantages of dot thickening called mechanical dot gain.
It is possible to improve the workability and reduce the amount of waste paper, and it is possible to obtain a printed material which is in good condition and sufficiently satisfies the required quality in terms of friction resistance, light resistance and chemical resistance.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a printing plate requiring no dampening solution.

FIG. 2 is an explanatory diagram of a printing plate that does not require a dampening solution and is dedicated to QUICKMASTER DI-46 (Heidelberg).

FIG. 3 QUICKMASTER DI-46 (same as above)
FIG. 6 is an explanatory diagram of an example of a digital workflow of printing using the “.

[Explanation of symbols]

1 Ink repelling layer 2 Ink receiving layer 2a Ink receiving layer exposed part 3 Adhesive layer 4 Substrate 5 Image area 6 Non-image area 7 Ink receiving layer 100 ‥ Printing plate without dampening solution 200 ‥‥ (for QUICKMASTER DI-46 only) Printing plate without dampening solution

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Naoki Takematsu 1-5-1, Taito, Taito-ku, Tokyo Inside Toppan Printing Co., Ltd.

Claims (3)

[Claims] 1. A waterless offset printing method using a fountain solution-free printing plate in which a required portion of an ink repellent layer laminated on an ink receiving layer is removed and an image portion is formed by an exposed portion of the ink receiving layer. A printing method characterized by printing using UV ink, IR ink, and EB ink. 2. The printing method according to claim 1, wherein immediately after printing, ultraviolet rays, infrared rays, and electron beams are irradiated from an irradiation device suitable for each ink on a printing press and dried. 3. A printing plate requiring no dampening solution, wherein a required portion of an ink repellent layer laminated on an ink receiving layer is removed by a laser based on digital data of an image. The printing method described.