JPH0647316B2 - Method for producing support for stencil printing plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a porous support for a stencil printing plate (hereinafter referred to as “support”).
That is, the present invention relates to a method for producing a support in which the size and shape distribution of the porous openings are uniform.

(Prior Art) There are various stencil printing original plates, for example, JP-A-51-490.
45, No. 52-27634, a discharge copy base paper in which a support is coated or impregnated with a semiconductive paint, as disclosed in JP-A No. 58-153697, 59-115898, 59-115899,
As disclosed in JP-A-59-22796 and JP-A-60-109899, a thermosensitive copying base paper in which a thermoplastic thin film and a support are bonded with an adhesive, and further, for example, in JP-B-59-23719. As described above, an impact-type copying base paper to be perforated with an iron brush, a ball-point pen, a typewriter, a wire dot printer, or the like, and a support such as a base paper in which a support and a resin and a softening agent are coated or impregnated is widely used. The purpose of use of the support in these base papers is an essential component in order to reinforce the coating film or film used therein and to prevent the internal parts of figures and characters having closed loops from falling off.

As a support used for these conventional base papers, for example, as shown in Japanese Patent Publication No. 59-23719, Mitsumata, natural fibers such as Kozo, Manila hemp, pulp, or synthetic rayon, vinylon, tetron, acrylic, etc. A single fiber or a fiber made by mixing these fibers (hereinafter referred to as "Japanese paper"), or a mesh sheet as disclosed in JP-A-59-22796 is used.

In addition, for example, Japanese Patent Application Laid-Open No. 60-87095 proposes "a heat-sensitive copying base paper in which a large number of fibers are arranged substantially parallel to each other at a predetermined interval in only one direction and adhered on one surface of the film. It has been proposed to use a large number of fibers, which are substantially parallel to each other and are spaced at a predetermined distance, as a substitute for a support of Japanese paper or a mesh-shaped sheet.

Further, Japanese Patent Publication No. 49-5 relating to the same applicant as the applicant of the present invention
Japanese Patent No. 934 discloses, "Thermal thermal copying base paper having a heat-resistant resin layer of a pattern in which a substantially closed shape is assembled on a thermoplastic resin film and which is not substantially softened and melted at a temperature at which the film is perforated. Is proposed. In this case, the so-called support becomes a heat-resistant resin layer having a substantially closed shape pattern.

(Problems to be Solved by the Invention) However, the supports proposed hitherto have respective problems, and it is the actual situation that Japanese paper is widely used as the supports while recognizing the problems. .

The stencil printing original plate using the most widely used Japanese paper as a support is, for example, as described in JP-A-60-87095, the fiber thickness of the support and the size and shape distribution of the porous openings. Is uneven, and there are irregular portions where fibers overlap in the thickness direction.Therefore, uneven perforation during plate making and irregular ink passage resistance during printing make print image density irregular. Although there is a drawback that a good printed image cannot be obtained due to light and shade in the rule, when the mesh-like sheet is used as the support, the above problems can be almost solved, but to use it as a support for the stencil printing plate. Since the price is too high, it is not used except for special purposes, and in reality, almost all Japanese paper is used as the support despite the above problems.

On the other hand, a base paper obtained by uniformly applying a resin that crosslinks three-dimensionally by light irradiation onto a film and irradiating light according to a pattern to remove the uncrosslinked resin in the unexposed portion with a solvent has a desired support thickness. Although it is possible to achieve satisfactory printing image quality and printing durability, use Japanese paper because of loss due to use of solvent and washing out of uncrosslinked parts and cross-linking into three-dimensional resin by irradiation of light. There was also the problem that it would be quite expensive for things.

(Means and Actions for Solving Problems) The present inventors diligently studied a method for producing a support suitable for an inexpensive stencil printing plate such as a mesh sheet which does not have the drawbacks of the conventional Japanese paper. As a result, the inventors have found a method of preparing a support suitable for a stencil printing plate by combining a resin solution and a device having a substantially closed concave assembly, and have completed the present invention.

That is, according to the present invention, the resin liquid is removed on a roll or an endless belt having a concave portion in which the remaining portion is etched, leaving a pattern in which the closed shape is closely and independently arranged, and the other portion is attached. It is possible to remove the resin and form the resin in the state where the resin liquid is present only in the concave portion, and then peel the resin film formed as an aggregate of the substantially closed shape from the roll or the belt. It is a feature.

The substantially closed shape pattern referred to in the present invention is circular,
Any shape such as an ellipse, a square, a rhombus, a polygon, or a combination thereof can be used, but a circle is relatively preferable. The size of the shape can be arbitrarily selected according to the purpose of use, the characteristics of the printing machine, the characteristics of the ink, etc. However, in the case of a circular shape, it is generally desirable to have a size of 20 μφ to 150 μφ, and the depth of etching is 5 to 200 μ, preferably 20 to 50 μ is suitable. In addition, the aggregate density of the shape can be arbitrarily selected according to the desired resolving power, but in general, a higher density is preferable, and in the case where the shape is circular, for example, 50 mesh or more, more preferably 120 mesh or more.

As the roll or the endless belt having the recessed drawing plate having such a shape, for example, one produced according to a so-called gravure roll production method can be preferably used. The resin liquid referred to in the present invention is not particularly limited, but for example, polyester acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, melamine acrylate, alkyd acrylate, acrylic acrylate, polyacetal acrylate, polybutadiene acrylate,
Prepolymers such as unsaturated polyester, if necessary, such as vinylpyrrolidone, 2-ethylhexyl acrylate, 2-hydroxydiethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl acryloyl phosphate, carpidol acrylate, phenoxyethyl acrylate, tetrahydrofurfree Acrylate, isobornyl acrylate, dicyclopentenyloxyethyl acrylate, N, N'-dimethylaminoethyl acrylate, 2- (N-methylcarbamoyl) acrylate, 1,3 butanediol diacrylate, 1,4 butanediol diacrylate 1,6-hexanediol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate Acrylate, polyesterols glycol diacrylate, neopentyl glycol diacrylate, hydroxy Pipa phosphoric acid ester neopentyl glycol diacrylate, 1,3-bis (3'
Acryloxyethoxy-2'-hydroxypropyl)
A reactive diluent such as -5,5-dimethylhydantoin, trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate is added as a cross-linking agent and a viscosity controlling agent in an appropriate amount in consideration of physical properties of the final cured product. Is an electron beam curable resin solution containing a storage stabilizer, a dye, a pigment, a wax, a silicone, a viscosity control agent, a surface tension control agent, a plasticizer, etc., if necessary, such as acetophenone, 2,2
-Diethoxyacetophenone, p-dimethylacetophenone, p-dimethylaminopropiophenone, benzophenone, 2-chlorobenzophenone, p, p'-dichlorobenzophenone, p, p'-diethylaminobenzophenone, Michler's ketone, ventil, benzoin, benzoin methyl ether , Benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-propyl ether, benzoin isobutyl ether, benzyl dimethyl ketal, tetramethyl thiuram monosulfide, thioxanthone, 2-chlorothioxanthone, 2-
Methylthioxanthone, azobisisobutyronitrile,
Benzoin peroxide, di-tert-butyl peroxide, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-
On, 1- (4-isopropyl) -2-hydroxy-2-
One or more photopolymerization initiators such as methylpropan-1-one and methylbenzoylformate are added, and if necessary, for example, n-butylamine, di-n-
Amines such as butylamine, triethyleneamine and triethylenetetramine, urea compounds such as allylthiourea and o-tolylthiourea, sodium diethyldithiophosphate, sulfur compounds such as s-benzyl-iso-thiuronium-p-toluenesulfinate, General formula (Wherein R ₁ and R ₂ are selected from a methyl group, an ethyl group, a β-cyanoethyl group or a β-chloroethyl group), an N, N-disubstituted-p-aminobenzonitrile compound, tri- Phosphorus compounds such as n-butylphosphine and sodium diethyldithiophosphate, N-nitrosohydroxylamine derivatives, other nitrogen compounds such as oxazolidine compounds and tetrahydro-1,3-oxazine compounds, chlorine compounds such as carbon tetrachloride and hexachloroethane,
A UV-curable resin liquid containing one or more sensitizers such as toluethanolamine triacrylate, and a thermosetting resin liquid such as urethane, unsaturated polyester, epoxy, alkyd, aminoalkyd, and phenol. Substantially solvent-free resin liquids (including those that are solid at room temperature and become liquid by heating), and emulsions and resin solutions dissolved in solvents are used. Above all, an electron beam or ultraviolet ray curable resin liquid is particularly preferable. The reason for this is that a large amount of heat is required to heat cure or volatilize a large amount of solvent on the roll or belt, and with resin liquid using a large amount of solvent, the resin film formed in the recess becomes thin due to removal of the solvent. The strength as a support is insufficient. Therefore, the recess must be formed deep. However, in order to improve the resolution, it is necessary to increase the aggregate density, but it is difficult to process the aggregate density to form the deep recesses.

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

When the resin liquid is applied to the roll or belt in this way, the resin liquid is naturally applied to the parts other than the recessed part, but in order to remove the adhered resin other than the recessed part, a doctor knife made of metal or resin is applied to the roll or the belt. It is sufficient to bring the resin liquid into contact with the concave portion to remove the resin liquid other than the concave portion so that the resin liquid exists only in the concave portion.

Next, as a means for forming a film of the resin liquid existing only in the concave portion, an appropriate method may be adopted depending on the type of the resin liquid. For example, in the case of an electron beam curable resin liquid, electron beam irradiation is performed, and an ultraviolet curable resin liquid is used. In the case of, if a small amount of solvent is used in these resin liquids, for example, the solvent may be removed with hot air and then electron beam irradiation or ultraviolet irradiation may be performed to polymerize and form a film. . When a so-called emulsion, a solvent-soluble resin liquid, or a thermosetting resin liquid is used, the solvent may be removed by heat treatment or the film may be formed by thermosetting.

After completing the film formation with the resin liquid confined in the recesses as described above, the size of the opening corresponding to the pattern of the recess assembly reliably formed on the roll by peeling the resin film from the roll or the belt, It is possible to obtain a porous support having a shape and a distribution.

It is also effective to apply a release agent such as a fluorine compound or a silicon compound to the roll or belt in advance so that the resin film can be easily peeled off from 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 described more specifically with reference to Examples.

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

Reference numeral 1 denotes an ultraviolet irradiation device. In this embodiment, the distance between the high pressure mercury lamp using a high pressure mercury lamp and the roll surface is about 12 cm.
I set it up to become.

Reference numeral 2 denotes a roll having a concave portion, and the roll having the concave portion aggregate pattern used in this example has a diameter of 90 μφ per 25.4 mm length.
There are 150 circular non-recesses (hereinafter referred to as “reverse gravure roll”), and the depth of the recess is 37 μ. The roll is rotated at a constant speed by a driving device (not shown).

3 is a doctor knife, and 4 is a pan in which the resin liquid is put.

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

6 is a guide roll and 7 is a winding roll.

First, apply UV curable resin liquid to the reverse gravure roll.
In front of Fluorine Spray Freon Co., Ltd. After blowing 82
And roll it into the resin solution as shown in Fig. 1.
Drive a reverse gravure roll and use a doctor knife to remove the recesses.
After removing the resin liquid and irradiating it with ultraviolet rays,
Remove the film-formed support from the reverse gravure roll and roll it up.
Rolled up.

The support thus obtained was also microscopically observed and found to have 90 μm per 25.4 mm length, similar to the pattern of the reverse gravure roll.
It was confirmed to be a mesh-shaped support having 150 circular holes of φ at regular intervals.

The mesh-like support thus obtained was impregnated with a semiconductive paint having a composition of nitrocellulose 10 parts dibutyl phthalate 3 parts carbon black 4.5 parts methanol 180 parts isopropyl alcohol 20 parts, and dried on one side of the following composition A high-conductivity paint was applied and dried to 3 g / m ² to form a high-conductivity layer.

Methacrylic resin 7 parts Carbon black 35 parts Toluene 80 parts The highly conductive layer surface of the electrical discharge copying cardboard thus obtained and the high-quality paper are superposed on each other. Electric discharge plate making machine [GOM-609D manufactured by Gakken Co., Ltd.]
As a result of plate-making and printing with, a good printed image similar to a desk-top offset printed matter was obtained with extremely high density and no uneven density. As a result of printing 3000 sheets, there was no difference in print image quality between the start and the printing of 3000 sheets, and the base paper was not torn. For comparison, a discharge migratory base paper was prepared and plate-printed in the same manner as above except that a conventionally used porous thin paper of 10 g / m ² was used in place of the support of the present invention. In comparison with the image obtained by using, the image density, uneven density, and resolution were all inferior, and clear differences in the printed image quality were observed.

Example 2 FIG. 2 is a schematic view showing another example of the manufacturing method of the present invention.
In the schematic diagram, 10 is a hot air dryer, and 20 is an electron beam irradiation device, and nitrogen gas is filled between the titanium foil window and the belt of the device. 30 is a doctor knife, 40, 5
Reference numeral 0 denotes a driving roll, 60 denotes an endless belt having a substantially closed concave portion aggregate, and the concave portion has 160 circular non-concave portions of 80 μφ per 25.4 mm length (hereinafter referred to as “reverse gravure”). It is called "belt".) The recess depth is 40.
is μ. Reference numeral 70 is a guide roll, 80 is a fountain for supplying a liquid, 90 is a product take-up roll, and 100 is a release agent coating device. In this embodiment, the hot air dryer 10 and the release coating device are not necessarily required, but they are described for reference.

Using the above apparatus, the driving roll 40, the fountain 80, and the resin liquid having the following composition are heated to 70 ° C., and the resin liquid is applied from the fountain 80 to the reverse gravure roll and the doctor knife 3 is used.
At 0, the resin solution other than the concave portion was removed, and after curing with electron beam irradiation, the guide roll was peeled off at the 70th position by the support formed by the reverse gravure belt and wound up by the winding roll.

Resin liquid When the support thus obtained was observed under a microscope, it was confirmed to be a mesh-like support having 160 regular circular holes of approximately 80 μφ per 25.4 mm length.

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 the paint to make the ink impermeable.

Nitrocellulose 10 parts Oleic acid 30 parts Stearic acid 10 parts Methanol 80 parts Ethyl acetate 15 parts Isopropyl alcohol 40 parts Printer PC-PR201 manufactured by NEC Corporation in which the impact-type copy base paper thus obtained is superposed on high-quality paper. After printing with the high-quality paper mounted on the platen roll side, printing was performed on a printing machine, and a print with good image quality was obtained.

On the other hand, for comparison, the support was changed to the above support, and the weight of the rice was 10g
Except for using the porous thin paper of m ² , as a result of printing the impact type copy base paper in the same manner as the above, the result of printing and printing, uneven density occurs according to the texture of the base paper, in comparison with the one using the support of the present invention. It was clear that the print image quality was poor.

Example 3 The support of the present invention obtained in Example 2 and a polyester film having a thickness of 3.5 μm are laminated with a polyvinyl acetate adhesive, and sodium stearate (0.5) is further applied onto the polyester film.
g / m ^{2 was} applied to prepare a heat-sensitive copy base paper.

The heat-sensitive copy base paper and the original obtained in this way are overlaid and printed with a heat-sensitive plate making machine (Lisograph FX7200 manufactured by Riso Kagaku Kogyo Co., Ltd.). Was given. As a precaution, 3000 sheets were printed, but the base paper was not torn at all, and the 3000 sheets were printed to obtain a printed matter of high image quality which was completely the same as at the start.

On the other hand, as a result of making a heat-sensitive copying base paper and making a plate-making print in the same manner as above except that a porous thin paper of 10 g / m ² was used instead of the support of the present invention, especially in a solid image part, uneven shading is severe and faint. Only the printed matter in which there was a part to be obtained was obtained.

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 without heating the drive roll 40, fountain 80 and resin liquid.
Similarly, the resin solution was applied to the reverse gravure belt to remove the resin solution other than the concave portions, and a film was formed through the hot air dryer 10 heated to 190 ° C. to obtain a support.

Polyvinyl chloride latex (Zeon Corporation, Zeon 15
0 × 15… solid content 48%) 100
Part Dioctyl phthalate emulsion (solid content 50%) 28
In addition, the reverse gravure belt was coated with a fluorine-based release agent by the release agent application device shown in FIG. The thickness of the support thus obtained was about 20μ.

The mesh-like support thus obtained was impregnated with the semiconductive coating material used in Example 1 and dried, and the highly conductive coating material of Example 1 was applied to one side at 3 g / m ² and discharged. Created a copy base paper. As a result of plate-making and printing the thus obtained electrophotographic copy base paper in the same manner as in Example 1, a good printed image could be obtained as in Example 1.

(Effects of the Invention) As described above, according to the method of the present invention, it is possible to economically prepare a stencil printing plate support in which the size, shape and distribution of the porous openings are uniform. In addition, by using the copy base paper prepared using the support of the present invention, it is possible to easily obtain an extremely high-quality printed matter close to a desk-top offset printed matter by a simple printing means called stencil printing.

[Brief description of drawings]

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

Claims (1)

[Claims] 1. An electron beam or an endless belt on a roll or an endless belt having a recess in which a large number of substantially closed shapes are closely and independently arranged on the surface, and the remainder is etched. An assembly having a substantially closed shape after applying a UV-curable resin liquid and removing the resin liquid other than the concave portion and irradiating an electron beam or ultraviolet rays in the state where the resin liquid exists only in the concave portion to form a resin film A method for producing a support for a stencil printing original plate, which comprises peeling the resin film formed as above from a roll or an endless belt.