JPS62199445A - Manufacture of support for screen printing base plate - Google Patents

Abstract

PURPOSE:To make it possible to economically form the support for a screen printing base plate wherein the size, shape and distribution of the perforated opening part are equal with each other, by forming a resin into a film in such a state that the liquid resin is present only in the recessed parts of a roll or an endless belt and releasing the resin film formed as an aggregate having a substantially closed shape. CONSTITUTION:An ultraviolet curable resin liquid 5 is applied to a roll 2 having recessed parts formed by etching a blank part so as to leave a pattern wherein substantially closed shapes are arranged independently in a closely contacted state. The adhered resin present other than the recessed parts is removed to allow the resin liquid 5 to be present only in the recessed parts and, in this state, the resin liquid is irradiated with ultraviolet rays from an ultraviolet irradiation apparatus 1 to be formed into a film. Thereafter, the resin film formed as an aggregate having a substantially closed shape is released from the roll 2. As a result, the support for a screen printing base plate wherein the size, shape and distribution of the perforated opening parts are equal with each other can be formed economically.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a porous support (hereinafter referred to as "support") for a stencil printing original plate.
The invention relates to a method for producing a support having uniform porous openings in size and shape distribution.

(Prior art) There are various types of master plates for stencil printing, such as Japanese Patent Application Laid-Open No.
No. 49045, JP-A No. 52-27634, discharge copying paper having a support coated or impregnated with a semiconductive paint; Same 59-
22796 and 60-109899, heat-sensitive mimeograph paper prepared by bonding a thermoplastic thin film and a support with an adhesive, and furthermore, for example, Japanese Patent Publication No. 59-2
As shown in Publication No. 3719, impact-type mimeograph paper is perforated with a pen, golben, typewriter, wired printer, etc., and it can be widely used as a support such as base paper coated with or impregnated with a resin and a softening agent. is used. The purpose of the support in these base papers is as an essential component for reinforcing the paint coating or film used therein and for preventing internal parts of figures and characters having closed loops from falling off.

As shown in Japanese Patent Publication No. 59-23719, the supports used for these conventional base papers include natural fibers such as mitsumata, kozo, Manila hemp, and pulp, or synthetic materials such as rayon, vinylon, tetoron, and acrylic. Paper made from fiber alone or a mixture of these (hereinafter referred to as "Japanese paper") or, for example, Japanese Patent Application Laid-open No. 59-2
A mesh-like sheet as shown in Japanese Patent No. 2796 is used.

In addition, for example, Japanese Patent Application Laid-open No. 60-87095 states:
A heat-sensitive mimeograph paper has been proposed in which a large number of fibers are arranged substantially parallel to each other at predetermined intervals and bonded to one side of the film in only one direction. It has been proposed to use spaced materials as an alternative to Japanese paper or mesh-like sheet supports.

Furthermore, Japanese Patent Publication No. 49 of 1972, which belongs to the same applicant as the applicant of the present invention.
Publication No. 5934 states, ``Thermal copying machine having a heat-resistant resin layer which does not substantially soften or melt at the temperature at which the film is perforated, consisting of a set of mother turns in a substantially closed shape on a thermoplastic resin film. "Base paper for printing" has been proposed. In this case, the so-called support is essentially a heat-resistant resin layer with a pattern of closed holes.

(Problems to be solved by the invention) However, the supports that have been proposed so far have problems, and even though the problems are recognized, the reality is that Japanese paper is widely used as a support. .

The most widely used stencil printing original plate using washi paper as a support is characterized by the thickness of the fibers of the support, the size and shape distribution of porous openings, as described in JP-A No. 60-87095, for example. The fibers are uneven, and there are irregular parts where the fibers overlap in the thickness direction, so the perforation during plate making is uneven and the ink passage resistance during printing is irregular, resulting in poor printed image density. Although it has the disadvantage that it causes shading in the rules and makes it impossible to obtain a good printed image, the above problem can be almost solved if a mesh-like sheet is used as the support. Due to its extremely high price, it is not used except for special purposes, and despite the above-mentioned problems, the reality is that Japanese paper is almost always used as a support.

On the other hand, a base paper obtained by uniformly applying a resin that becomes three-dimensionally crosslinked by light irradiation on a film, irradiating it with light according to 9 turns, and removing the uncrosslinked resin in the unexposed areas with a solvent is used as a support. The thickness can be adjusted to the desired thickness to improve print image quality,
Although the printing durability is satisfactory, it is comparable to those using Japanese paper due to the use of solvents and the loss due to the crosslinked three-dimensional resin flowing out due to the use of solvents and irradiation with light to wash out uncrosslinked parts. The problem was that it was expensive.

(Means and effects for solving the problem) The present inventors have conducted extensive studies on a method for producing a support suitable for a stencil printing original plate that does not have the drawbacks of conventional Japanese paper and is not expensive such as a mesh-like sheet. As a result, the present invention was completed by discovering a method for creating a support suitable for a stencil printing original plate by combining a resin solution and a device having a substantially closed-shaped recess assembly.

That is, in the present invention, a resin liquid is applied onto a roll or an endless belt having concave portions in which the remaining portions are etched, leaving a pattern in which substantially trap-closed shapes are closely and independently arranged, and the remaining portions are etched to form a pattern in which the resin liquid is applied to the roll or endless belt, thereby removing any adhesion in areas other than the concave portions. The resin is removed and a resin film is formed in a state where the resin liquid is present only in the recesses, and then the resin film formed as a substantially closed aggregate is peeled off from a roll or belt. This is a characteristic feature.

The 79 turns having a substantially closed shape in the present invention may be a circle, an ellipse, a square, a rhombus, a polygon, or a combination thereof, but a circle is relatively preferable, and the size of the shape is It can be arbitrarily selected depending on the purpose of use, printing machine characteristics, ink characteristics, etc., but for example, in the case of a circular shape, it is generally [about 20 μφ to 150 μφ is preferable,
The depth of the etching is suitably 5 to 200 microns, preferably 20 to 50 microns. Further, the aggregate density of the shape can be arbitrarily selected depending on the desired resolution, but in general, the higher the density, the better, and in the case where the shape is circular, for example, it is 50 meshes or more, preferably 120 meshes or more.

As a roll or an endless belt having such a vertical concave pattern plate, for example, one made according to the so-called gravure roll making method can be suitably used. The resin liquid referred to in the present invention is not particularly limited, but includes, for example, polyester acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, melamine acrylate, alkyd acrylate, acrylic acrylate, polyacetal acrylate, polybutadiene acrylate,
For example, vinylpyrrolidone, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-and-droxyethyl acryloyl phosphate, carpidol acrylate, phenoxy may be added to the prepolymer such as unsaturated polyester, if necessary. Ethyl acrylate, tetrahydrofurfuryl acrylate, isogolnylacrylate, dicyclopentenyloxyethyl acrylate)%'N,N'-trimethylaminoethyl acrylate, 2-(N-methylcarbamoyl)acrylate, 1,3 butane Diol diacrylate, 1,4 butane diol diacrylate, 1
．． 6-hexanediol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, polyethylene glycol cyacrylate, neopentyl glycol diacrylate, hydroxypi-9 phosphate neopentyl glycol diacrylate, 1,
3-bis(3'-acryloxyethoxy-2'-hydroxycillobil)-5,5--)methylhydantoin,
Add an appropriate amount of reactive diluents such as trimethylol glonotriacrylate, pentaerythritol triacrylate, and dipentaerythritol hexaacrylate as a crosslinking agent and viscosity control agent, taking into account the physical properties of the final cured product, and further store if necessary. stabilizers, dyes, pigments, waxes,
Electron beam curable resin liquid containing silicone, viscosity control agent, surface tension control agent, plasticizer, etc. Examples of the electron beam curable resin include acetophenone, 2,2-jethoxyacetophenone, p-dimethylaminoacetophenone, p-dimethyl Aminoacetophenone, benzophenone, 2-chlorobenzophenone II PIP'-dichlorobenzophenone,
p,p'-diethylaminobenzophenone, Michler's ketone, pentyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-globyl ether, benzoin isobutyl ether, benzyl dimethyl ketal, tetramethylthiuram monosulfide, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, azobisisobutyronitrile, benzoin I
? -oxide, di-tart-butylno-4-oxide, 1-hydroxycyclohexylphenyl ketone, 2
-hydroxy-2-methyl-1-phenyl-1-one,
One or more photopolymerization initiators such as 1-(4-isopropyl)-2-hydroxy-2-methylpropan-1-one and methylbenzoyl formate are added, and if necessary, e.g. n-butylamine, Amines such as di-n-butylamine, triethyleneamine, triethylenetetramine, urea-based compounds such as allylthiourea, o-)lylthiourea, sodium diethyldithiophosphate, s-pen, diruine-thicuronium-p-)ruenes sulfur compounds such as rufinate, N,N-disubstituted-p-aminobenzonitrile compounds represented by ethyl group, β-cyanoethyl group or β-chloroethyl group), tri-n-butylphosphine, sodium Phosphorus compounds such as diethyldithiophosphate, N-nitrosohydroxylamine derivatives, oxazolidine compounds, low nitrogen compounds such as tetrahydro-1,3-oxazine compounds, chlorine compounds such as carbon tetrachloride, hexachloroethane, toluethanolamine triacrylate, etc. Resin liquid made UV curable by adding one or more sensitizers,
Furthermore, thermosetting resin liquids such as urethane, unsaturated polyester, epoxy, alkyd, aminoalkyd, and phenol are essentially solvent-free resin liquids (even if they are solid at room temperature, they can be turned into liquid by heating). Furthermore, emulsions and resin solutions dissolved in solvents are used. Among these, electron beam or ultraviolet curable resin liquids are particularly preferred.

The reason for this is that a large amount of heat is required to thermally cure or volatilize a large amount of solvent on a roll or belt, and in the case of a resin solution that uses a large amount of solvent, the resin film formed in the recesses is difficult to remove. It becomes thin and lacks strength as a support. C, the recess must be formed deeply. However, in order to improve resolution, it is necessary to increase the aggregate density, but increasing the aggregate density and forming a deep recess is difficult in processing.

Furthermore, the method of applying these resin liquids onto the roll or belt is not limited at all; for example, the liquid may be placed in a pan and the roll is submerged in the liquid, or the liquid may be applied from the pan to the roll or belt via a pickup roll. Alternatively, the liquid may be applied to the roll or belt from a fountain, or the liquid may be cast onto the roll or belt. At this time, in order to appropriately control the viscosity of the resin liquid, it is also effective to heat the resin liquid and the roll or belt to an appropriate temperature.

When the resin liquid is applied to the roll or belt in this way, the resin liquid will naturally be applied to areas other than the recessed areas, but in order to remove the adhered resin from areas other than the recessed areas, a metal or resin doctor knife must be used on the roll or belt. It is sufficient to apply pressure to remove the resin liquid from areas other than the recessed parts so that the resin liquid exists only in the recessed parts.

Next, as a means for forming a film from the resin liquid existing only in the recesses, an appropriate method may be adopted depending on the type of resin liquid. For example, in the case of an electron beam curable resin liquid, electron beam irradiation, In the case of resin liquids, UV irradiation is applied, and if a small amount of solvent is used in these resin liquids, for example, after removing the solvent with hot air, polymerization is performed by irradiation with electron beams or ultraviolet rays, respectively, to form a film. Just let it happen. Further, when a so-called emulsion, a solvent-dissolved resin liquid, or a thermosetting resin liquid is used, the film may be formed by heat treatment, removal of the solvent, etc., or thermosetting.

After completing film formation with the resin liquid confined in the recesses as described above, the resin film is peeled off from the roll or belt to ensure the size of the opening corresponding to the pattern of the recess aggregate formed on the roll, A porous support having a specific shape and distribution can be obtained.

It is also effective to apply a release agent such as a fluorine compound or silicone compound to the roll or belt in advance so that the resin film can be easily peeled off, and when forming recesses on the roll or belt. It is also preferable that the shape of the recess is tapered so that the upper surface of the recess has a larger area than the bottom of the recess.

(Examples) Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 FIG. 1 is a schematic diagram showing an example of the manufacturing method of the present invention.

1 is an ultraviolet irradiation device. In this example, a high-pressure mercury lamp was used and installed so that the distance between the high-pressure mercury lamp and the roll surface was about 12 m.

2 is a roll having a concave portion, and the roll having a concave aggregate pattern used in this example has a roll of 90 per 25.4 m length.
There are 150 circular non-recessed portions of μφ (hereinafter referred to as "reverse gravure roll"), and the depth of the recessed portions is 37μ.

The roll is rotated at a constant speed by a drive device (not shown).

3 is a doctor knife) 4 is a pan into which the resin liquid is poured.

5 is an ultraviolet curable resin liquid, and the composition of the resin liquid used in this example is as follows.

6 is a guide roll, and 7 is a take-up roll.

First, before applying the ultraviolet curable resin liquid to the reverse gravure roll, after spraying ■Fluorine Sugereiflon■82.
As shown in Figure 1, the motherboard is raised and the roll is immersed in the resin liquid, the reverse gravure roll is driven, the resin liquid outside the concave areas is removed using a doctor knife, and after UV irradiation, the reverse gravure roll is removed using 6 guide rolls. 25. Peel off the film-formed support and roll it up with a take-up roll in the same manner as the gravure roll pattern.
It was confirmed that it was a mesh-like support having 150 circular holes of 90 μΦ per 4 haze lengths at regular intervals.

Nitrocellulose trapped in the mesh-like support thus obtained 10 parts 7 diptyl talate 3 parts Carzen black 4.5 parts methanol
1808 0 parts Isopropyl alcohol 20 parts of semiconductive paint is impregnated and dried, and one side is coated with 3f of highly conductive paint of the following composition! /m'' and dried to form a highly conductive layer.

Methacrylic resin 7 parts Cargan black 35 parts Toluene 80 parts The highly conductive layer surface of the thus obtained discharge paperboard was overlaid with high-quality paper, and an electric discharge plate making machine [GOM-609 manufactured by Gakushu Kenkyusha Co., Ltd.] was used.
As a result of plate making and printing using [D], a good printed image was obtained which was extremely precise and had strong shading unevenness, similar to a tabletop offset print. Also, as a result of printing 3000 sheets, 300
There was no difference in print image quality when printing 0 sheets, and no tearing occurred in the base paper.

For comparison, electrical discharge mimeograph paper was prepared in the same manner as described above, except that a conventionally used porous thin paper of 10 Ii/m'' was used in place of the support of the present invention, and as a result of plate-making printing, the support of the present invention was obtained. There was a clear difference in the fineness, density unevenness, and resolution of the image compared to those using the 10-print image quality.

Example 2 FIG. 2 is a schematic diagram showing another example of the manufacturing method of the present invention.

In the schematic diagram, 10 is a hot air dryer, 20 is an electron beam irradiation device, and the space between the titanium foil window of the device and the belt is filled with nitrogen gas. 3o is a doctor knife, 40.5
0 is a driving roll, and 6° is an endless belt having a substantially closed-shaped concave assembly, and the concave portion has 160 circular non-concave portions of 80 μφ per 25.4 m length (hereinafter referred to as “ (referred to as "reverse gravure belt").The depth of the recess is 4.
It is 0゜μ. 70 is a guide roll, 8o is a fountain for supplying liquid, 90 is a winding roll for the product, and 100 is a release agent coating device. Incidentally, in this example, the hot air dryer 10 and the mold release agent coating device are not necessarily necessary, but are described for reference.

Using the above device, heat the drive roll 4017 fountain 80 and a resin liquid of the following composition to 700 ℃, apply the resin liquid from the fountain 80 to the reverse gravure roll, and then apply the doctor knife 3.
After removing the resin liquid from areas other than the concave portions at 0 and curing with electron beam irradiation, the film was peeled off using a reverse gravure belt at position 70 of the guide roll, and then wound up using a take-up roll.

Looking at the support obtained through resin liquid under a microscope, it was found to be 25.4ffi.
+++ It was confirmed that the long support was a mesh-like support having 160 regular circular holes of approximately 80 μΦ.

The mesh-like support thus obtained was impregnated with a paint having the following composition and dried, and the pores of the support were filled with a storage paint to make it permeable to ink.

Nitrocellulose 10 parts Oleic acid 30 parts Stearic acid 10 parts Methanol 80 parts Ethyl acetate 15 parts Isopropyl alcohol 40 parts The in-duct type mimeograph paper thus obtained was superimposed on high-quality paper and printed on a NEC printer P C-PR201. After printing was carried out on the machine with the high-quality paper facing the platen roll, prints with good image quality were obtained when the machine was run on a printing machine.

On the other hand, for comparison, the support was changed to the above support and the
In the same manner as above except that m2 porous tissue paper was used.
When duct-type mimeograph paper was prepared and printed, density unevenness occurred depending on the texture of the base paper, and it was clear that the printed image quality was inferior to that using the support of the present invention.

Example 3 The support of the present invention obtained in Example 2 and a 3.5 μ thick polyester film were bonded together using a polyvinyl acetate adhesive, and 0.5 μm of sodium stearate was added onto the polyester film.
17m” @ cloth to make thermal mimeograph paper.

The heat-sensitive mimeograph paper thus obtained and the manuscript were superimposed and plate-made and printed using a heat-sensitive plate making machine (Sograph FX7200 manufactured by Riso Kagaku Kogyo). As a result, a sharp, even-toned, and high-quality print similar to a table-top offset print was obtained. Ta. As a precaution, I printed 3,000 sheets, but the base paper did not tear at all, and even after printing 3,000 sheets, I was able to obtain prints with high image quality that was completely the same as when I started.

On the other hand, heat-sensitive mimeograph paper was prepared in the same manner as above except that a porous thin paper with a square meter area of 1017 m2 was used instead of the support of the present invention.As a result of plate-making printing, the unevenness of shading was severe, especially in the solid image area, and the faded areas were I could only get the prints that existed.

Example 4 Using the support manufacturing apparatus used in Example 2, the following resin liquid was used instead of the resin liquid used in Example 2, and the drive roll 40, fountain 80, and resin liquid were not heated.
Similarly, apply the resin liquid to the reverse gravure bell) KI! ! Hot air dryer 1 heated to 190°C to remove resin liquid from areas other than the cloth recesses
A film was formed by passing 0 through it to form a support.

PVC latex 1
00 parts (Nippon Zeon ■, Zeon 150X15...Solid content 48 inches) Dioctyl 7 tallate emulsion (Solid content 50%) 28 parts In addition, the reverse gravure belt is coated with fluorine based release agent using the release agent applicator shown in Figure 2. A mold release agent was applied. The thickness of the support thus obtained was approximately 20μ.

The mesh-like support thus obtained was impregnated with the semi-conductive paint used in Example 1 and dried, and the highly conductive paint of Example 1 was applied to one side in a thickness of 317 m'' to prepare discharge paper. The electrical discharge stencil paper thus obtained was plate-made and printed in the same manner as in Example 1, and as a result, a good printed image could be obtained as in Example 1.

(Effects of the Invention) As explained above, according to the method of the present invention, it is possible to economically produce a support for a stencil printing original plate in which the size, shape, and distribution of porous openings are uniform. Furthermore, by using a mimeograph paper prepared using the support of the present invention, it is possible to easily obtain extremely high-quality printed matter similar to that of table-top offset printed matter using a simple printing method called stencil printing.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of the manufacturing method used in Example 1 of the present invention. FIG. 2 is a schematic diagram showing an example of the manufacturing method used in Example 2 of the present invention.

Claims (1)

[Claims] A resin liquid is applied onto a roll or an endless belt having recesses etched into it, leaving a pattern in which many substantially closed shapes are closely and independently arranged on the surface. After removing the adhered resin liquid and forming a resin film with the resin liquid present only in the recesses, the resin film formed as a substantially closed aggregate is peeled off from a roll or an endless belt. Characteristic manufacturing method for stencil printing original plate support