JPH03118193A - Resin gravure printing plate - Google Patents

Abstract

PURPOSE:To shorten a plate making process and to reduce an unstable element by providing a resin composition composed of an electron beam or ultraviolet curable resin or a resin containing an electron beam or ultraviolet curable monomer and a resin layer composed of a polymerizable monomer or oligomer containing a silicon atom in its molecule. CONSTITUTION:As an electron beam or ultraviolet curable resin or monomer, ester acrylate, epoxy acrylate and urethane acrylate can be generally used and said resin or monomer is pref. difunctional or more. Further, an acrylate resin having high surface tension is pref. As a polymerizable monomer or oligomer containing a silicon atom in its molecule, one containing an acryloyl group is especially pref. A composition layer 1 consisting the polymerizable monomer or oligomer containing a silicon atom and the electron beam or ultraviolet curable resin mixture is applied to a film or sheet like support 2 and irradiated with electron beam or ultraviolet rays on the resin layer side to be cured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a gravure printing plate, and more particularly to a resin gravure printing plate that can be made by a simple process.

Gravure printing plates are a type of intaglio printing, and compared to other printing methods, the printing method is simple, and the resulting prints have a large amount of ink coverage and rich gradation, making them ideal for visual presentation with many color photographs. suitable for things. In particular, because the ink is fluid and quick-drying, it is suitable for high-speed printing, and at the same time, many resins can be used as the printing ink vehicle, so it is often used as a printing method for printing materials without paper removal. .

It is used in a wide variety of applications, including publishing, book printing, paperboard printing, light packaging printing, and building materials printing.

[Conventional technology]

Compared to other printing methods, the gravure method requires a more complicated plate-making method.For example, the conventional gravure method uses carbon tissue and uses a chemical corrosion method, which requires a large number of steps and takes a long time, making it unstable. There are many problems with pollution and high costs. The net gravure method also requires a chemical corrosion process, so there are many unstable factors as well.On the other hand, the electronic engraving gravure method does not require carbon tissue or a chemical corrosion process, so
Quality instability and pollution problems are reduced; however, the plate cylinder is usually made of copper plating or even chrome plating, so the problem of high cost still remains.

Therefore, in order to omit the chemical corrosion process, which is the drawback mentioned above, a method of manufacturing resin gravure plates has been considered, in which the plate surface is coated with resin and the resin layer is engraved. Since ABS resin, polyamide resin, vinyl chloride resin, etc. are mainly used as resins, it has satisfactory scratch resistance by doctors, solvent resistance that can withstand gravure ink solvents, and rigidity resistance due to the synergistic effect of the above factors. It wasn't possible. Furthermore, since cracks are likely to occur during engraving, there remains a problem in engraving ease at the initial stage of the process.

In addition, in order to satisfy both engraving suitability and doctor abrasion resistance, a method of curing a polyamide resin alone or a mixed composition of a polyamide resin and a radiation-polymerizable substance with ultraviolet rays, electron beams, etc. has been proposed. 56-1975
8 and JP-A No. 57-56259, respectively, but the scratch resistance is still not fully satisfactory, and since polyamide is used as the main component of the resin composition, the water resistance is The problem remained that the ink was low, which caused problems especially when using water-based ink.

[Problems to be Solved by the Invention] The problems to be solved by the present invention are as described above. By applying this method to the gravure method, it is possible to shorten the plate-making process and reduce unstable factors, while also solving the problems of pollution and high costs.

In addition, by imparting good solvent resistance, hardness, and surface lubricity, it can withstand abrasion caused by doctor's ink scraping, has excellent stiffness resistance, and enables mass production of printed matter with stable manufacturing quality. The purpose is to provide a resin gravure printing plate that can withstand the use of ink.

[Means for Solving the Problems] That is, the present invention provides a resin composition comprising at least an electron beam or ultraviolet ray curable resin, or a monomer-containing resin, on a film or sheet-like support, and a resin composition containing a monomer. This is a resin gravure printing plate provided with a resin layer made of a polymerizable monomer or oligomer containing silicon atoms.

Here, the electron beam or ultraviolet ray curable resin or monomer used in the present invention is an ester acrylate containing at least two or more acryloyl groups or methacryloyl groups in one molecule.

Ester methacrylate, epoxy acrylate.

Epoxy methacrylate, urethane acrylate, urethane methacrylate.

[Details of the invention] Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is an explanatory diagram of one embodiment of the resin gravure printing plate of the present invention, and FIGS. 2(a) and 20)) are explanatory diagrams of other embodiments of the resin gravure printing plate of the present invention. It is.

First, the constituent materials will be explained, and then the manufacturing process will be explained.

In FIG. 1, 1 is a layer of a mixed resin composition containing a silicon atom-containing polymerizable monomer or oligomer and an electron beam or ultraviolet curable resin composition, and 2 is a film or sheet-like support.

The electron beam or ultraviolet ray curable resin described in the present invention,
Or as a monomer, - ester acrylate,
Ester methacrylate, epoxy acrylate, epoxy methacrylate, urethane acrylate, and urethane methacrylate can be used, but those having at least two functional groups and providing a cured film with a high crosslinking density are preferred. Furthermore, in order to maintain compatibility with various ink solvents and vehicles and provide good ink receptivity, acrylate resins with high surface tension are preferred.

As the polymerizable monomer or oligomer containing a silicon atom in the molecule, those containing an acryloyl group and a methacryloyl group as a radically polymerizable group are particularly preferable.

The mixing ratio of the polymerizable monomer or oligomer containing a silicon atom and the electron beam or ultraviolet ray curable mixed resin composition is preferably in the range of 1:20 to 1:4 in terms of weight ratio, but depending on the type of material The optimum mixing ratio will change if the film or sheet base material used changes, so it is not limited to this range. Furthermore, if necessary, polyester resin, polystyrene, styrene-acrylic copolymer, polyester resin, polystyrene, styrene-acrylic copolymer, etc. Thermosetting resins such as vinyl chloride 5 polyvinyl acetate, vinyl chloride vinyl acetate copolymer, polyvinyl acecool, alkyd resin, acrylic resin, polyacrylonitrile, polycarbonate, polyketone, epoxy resin, phenol resin, melamine resin.

Thermosetting resins such as silicone resins and polyimide resins can be added.

The film or sheet-like support 2 must have appropriate mechanical strength and surface smoothness to withstand high-speed printing, and specifically, polyester, polycarbonate, acrylic, etc. can be used, and the thickness is 20 μm or more. Also preferred are polyimides, polyetheretherketones, and polyetherimides.

Engineering plastic films such as polyphenylene sulfide can also be used.

Next, the manufacturing process will be explained.

First, in FIG. 1, a layer 1 of a mixed resin composition of a polymerizable monomer or oligomer containing silicon atoms and an electron beam or ultraviolet curable composition is coated on a film or sheet-like support 2 by knife coating.

After coating by a known method such as roll coating or barcoding, it is cured by irradiating the resin layer with electron beams or ultraviolet rays. After coating the resin layer, by allowing a suitable standing time, a polymerizable monomer or oligomer containing silicon atoms, which has excellent solvent resistance and lubricity that can withstand wear caused by doctor's ink scraping, can be used. After transferring to the coating surface, it is preferable to cure with electron beam or ultraviolet rays. In this case, in order to carry out a sufficient curing reaction, the electron beam irradiation amount is 1. OMrad or higher, 100 mJ for ultraviolet rays
/cm' or more is preferable.

In addition, in FIG. 2(a), after coating the film or sheet-like support 2 with an electron beam or ultraviolet curable resin layer 3, the electron beam or ultraviolet rays are irradiated from the resin layer side. To the extent that adhesiveness can be maintained,
After preliminary curing, as shown in FIG. 2(b), a polymerizable monomer or oligomer containing silicon atoms is coated on the electron beam or ultraviolet ray curable resin layer 3, and then an electron beam or ultraviolet ray curable resin layer 3 is applied. Complete curing is performed by irradiating with , and a polymerizable monomer or oligomer layer 4 containing silicon atoms is formed. In this case, in order to perform preliminary curing, the electron beam irradiation amount must be 0.5 to 2.0.
Mrad, for ultraviolet rays, 50 to 250 mJ/cm" is appropriate. For complete curing, the electron beam irradiation amount is 1.OMra.
d or more, and in the case of ultraviolet rays, it is preferably 100 mJ/cm” or more.

By plate-making the surface of the resin gravure printing plate obtained by the above method using a conventional engraving gravure method, printed matter with excellent printing durability and stable manufacturing quality can be produced in large quantities.

Hereinafter, the present invention will be explained in more detail using Examples.

[Example 1] On a support made of a polyester film with a thickness of 200 μm, an electron beam or ultraviolet ray curable mixed resin liquid having the following composition was coated with a knife to a thickness of about 40 μm,
After forming the resin layer, a 200 keV electron beam was irradiated from the resin layer side at an absorbed dose of 6 Mrad to cure the resin layer, thereby producing a resin gravure printing plate.

10 parts by weight Next, the resin gravure plate was attached to a Heliocrischograph model 1200 (manufactured by Hell AG, West Germany), and the engraving screen line count was 4811 in/cm, the screen angle code was 1, and the engraving speed was 6011 in/cm. Electronic engraving platemaking was performed under the following conditions.

The resin gravure printing plate obtained by the above method was attached to GP-2 (manufactured by Kurashiki Boseki Co., Ltd.) obtained with a gravure flatbed proofing machine, and the 0GSB process (manufactured by Toyo Ink Manufacturing Co., Ltd.) was used as the ink. Printing was performed on medium-quality coated paper at a printing speed of 30 m/min. The ink removal by the doctor was good, and prints with clear images were obtained.

[Example 2] A resin liquid having the following composition was coated on a 100 μm thick polyester film using a knife coat to a film thickness of about 35 μm to form a resin layer, and then the strength was measured from the resin layer side. A resin gravure printing plate was prepared by irradiating with ultraviolet rays of 500 mJ/cm''.

Next, gravure printing was performed under the same plate making and printing conditions as in Example 1. A clear printed matter similar to that of Example 1 was obtained.

[Example 3] After coating a resin liquid with the following composition on a polyester film under the same conditions as in Example 1, 200ke was applied from the resin layer side.
The electron beam of V is absorbed by the absorption line 11. The resin layer is precured by irradiation under OMrad conditions, and then a film of I3-bis(3-methacryloxypropyl)-11,3,3-tetramethyldisiloxane is formed on the precured resin layer. Wire bar coating was applied to a thickness of approximately 3 μm, and then a 200 keV electron beam was applied to the absorbed dose of 5°OMra.
The resin layer was completely cured by irradiating under the conditions of d.

Next, gravure printing was performed under the same plate-making and printing conditions as in Example 1, except that Aquacolor R-39 Indigo (manufactured by Toyo Ink Seisakusho) was used as the water-based ink. Example 1
Good prints similar to those obtained were obtained.

[Effects of the Invention] By using the resin gravure printing plate according to the present invention, the conventional printing plate can be improved. 3 [It can significantly shorten the complicated process, and
It is possible to reduce unstable factors and solve problems of pollution and high costs.

In addition, by containing a polymerizable monomer or oligomer containing a silicon atom in the resin gravure printing plate or providing it in the surface layer, good solvent resistance can be imparted.
Characteristics sufficiently suitable for use with water-based inks can be obtained. Furthermore, since it has abrasion characteristics that can withstand ink scraping by a doctor, it becomes possible to mass-produce printed matter with stable manufacturing quality.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of the resin gravure printing plate of the present invention, and FIGS. 2(a) and 2(b) are explanatory diagrams of other embodiments of the resin gravure printing plate of the present invention. . 1... Polymerizable monomer or oligomer containing a silicon atom and an electron beam or ultraviolet ray curable mixed resin composition layer 2... Support 3... Electron beam or ultraviolet ray curable resin layer 4...
・Patent application for polymerizable monomer or oligomer layer containing silicon atoms Kazuo Suzuki, Representative of Toppan Printing Co., Ltd. Figure 1 Figure 2 (a) Figure 2 (b) Procedural amendment (voluntary) 1990 January/l) day

Claims (2)

[Claims] (1) A resin composition consisting of at least an electron beam or ultraviolet curable resin, or a resin containing a monomer, and a polymerizable monomer containing a silicon atom in the molecule, on a film or sheet-like support. Alternatively, a resin gravure printing plate characterized by being provided with a resin layer made of an oligomer. (2) Ester acrylate, ester methacrylate, epoxy acrylate, in which the electron beam or ultraviolet ray curable resin or monomer contains at least two or more acryloyl groups or methacryloyl groups in one molecule;
The resin gravure printing plate according to claim 1, comprising any one of epoxy methacrylate, urethane acrylate, and urethane methacrylate.