JPH0858055A - Engraving method for stencil printing base sheet - Google Patents

Abstract

PURPOSE: To eliminate a perforating failure, occurrence of a wrinkle, conveying failure, etc., at the time of engraving by perforating in a non-contact state with solvent, and so infiltrating and diffusing resin dissolving solution in a porous support as to satisfy a relation formula. CONSTITUTION: When a stencil printing base sheet in which a solvent soluble resin layer is formed on a porous support is perforated by solvent to be engraved, the solvent is so supplied in a non-contact state by solvent supplying means that the liquid droplet radius r1 of the solvent, the thickness (d) of the layer and the spread radius r2 of the droplet supplied on the layer satisfy the relation of a formula -0.1<=-75d(r2 <2> /r1 <3> )<=100 to dissolve the layer of the supplied part, and the dissolved solution is infiltrated and diffused in the support. The layer contains thermoplastic resin or thermosetting resin which can be dissolved by solvent such as water, organic solvent, etc., as a main ingredient.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for making a stencil printing base paper, and more particularly to a method for making a stencil printing base paper which is capable of perforating the stencil printing base paper in a non-contact state.

[0002]

2. Description of the Related Art Conventionally, as a method for making a stencil printing base paper, (1) a stencil printing base paper obtained by impregnating a porous paper with wax or the like is used to write a character image with an iron brush, a ballpoint pen, etc. And (2) a method of heat-melting the thermoplastic resin film of the base paper for heat-sensitive stencil printing comprising a thermoplastic resin film and a porous support by heat from a flash, an infrared lamp, a thermal head, etc. Are known. However, in the method (1), since the plate making is performed manually, the plate making efficiency is poor and it is not possible to produce a large number of printing base papers.

On the other hand, in the method (2), a handwritten manuscript or a manuscript prepared in advance is superposed on a heat-sensitive stencil printing base paper, and the thermoplastic resin film is melted by heat generated by, for example, a flash or an infrared lamp. A method of punching, a method of using a thermal head that generates character image information as dot-shaped heat according to an electric signal, and a method of melting and punching a thermoplastic resin film by bringing it into contact with a heat-sensitive stencil sheet . However, in the former method, it is necessary to replace a new manuscript every time plate making is completed,
There are drawbacks in that it is inferior in operability and the consumption of the lamp increases. In the latter method, the replacement of originals and the consumption of consumables such as lamps are small, but the melt of the thermoplastic resin film remains on the porous support, which hinders the ink from passing during printing, resulting in clear printed matter. There was a drawback that you could not get. Furthermore, in this method, the heat sensitive stencil sheet and the thermal head need to be sufficiently brought into close contact with each other at a high pressure during plate making. There was a flaw.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to make a new stencil printing plate making plate free from perforation defects, wrinkles, conveyance defects and printing defects during plate making. To provide a method.

[0005]

The invention claimed by the present invention is as follows. (1) When a stencil printing base paper having a solvent-soluble resin layer formed on a porous support is perforated with a solvent to carry out plate making, a solvent in the form of droplets is supplied to the surface of the solvent-soluble resin layer. In a non-contact state, the radius r ₁ of the droplet of the solvent, the thickness d of the solvent-soluble resin layer and the spread radius r _{2 of the} droplet supplied onto the resin layer are represented by the following formula (1) 0. ^{_{1 ≦ 75d (r 2 2 /}} r 1 3) ≦ 100 (1) the relationship supply to dissolve the solvent-soluble resin layer of the supply portion so as to satisfy, in the lysis solution the porous support A method for making a stencil sheet, which is characterized by permeating and diffusing inside.

The solvent-soluble resin layer used in the present invention is
It contains, as a main component, a thermoplastic resin or a thermosetting resin which can be dissolved in a solvent such as water or an organic solvent. As the resin component soluble in an organic solvent, for example, polyethylene, polypropylene, isobutylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl fluoride, polyvinyl acetate, acrylic resin, polyacrylonitrile, polyamide, polyimide, petroleum resin, Phenol resin, amino resin, epoxy resin, polyester, polycarbonate, polyurethane, polysulfone, silicone resin, alkyd resin, melamine resin and the like are used. These resin components may be used alone or in combination, or as a copolymer.

As the water-soluble resin component, a resin soluble in water or a mixed liquid of water and an organic solvent miscible with water, such as polyvinyl alcohol and methyl cellulose,
Carboxymethyl cellulose, hydroxyethyl cellulose, polyvinylpyrrolidone, polyethylene-polyvinyl alcohol copolymer, polyethylene oxide, polyvinyl ether, polyvinyl acetal, polyacrylamide, starch, dextrin, alginic acid, ascorbic acid, water-soluble polyurethane and the like can be used. These resins may be used alone or in combination, or may be used as a copolymer.

The solvent-soluble resin layer may contain a dye, a pigment, a filler, a binder, a curing agent and the like in addition to the above resin components. The thickness d (μm) of the solvent-soluble resin layer is usually in the range of 0.1 to 100 μm, preferably 0.5.
Is in the range of up to 50 μm. If the thickness is less than 0.1 μm, the strength of the resin layer will be insufficient, and if it exceeds 100 μm, a large amount of solvent or water will be required to dissolve the resin layer, which may result in insufficient dissolution.

As the porous support used in the present invention, natural fibers such as Manila hemp, pulp, Mitsumata, Kozo and Japanese paper, synthetic fibers such as polyester, nylon, vinylon and acetate, non-woven metal fibers and glass fibers are used alone. Examples include thin paper, non-woven fabric, screen gauze, etc. used in or mixed with each other. The basis weight of these porous supports is 1.
The range is preferably ^{20 to 20} g / m ² , more preferably 5 to
It is in the range of 15 g / m ² . If it is less than 1 g / m ² , the strength of the base paper may be weakened, and if it exceeds 20 g / m ² , the ink permeability during printing may be deteriorated. The thickness of the porous support is preferably in the range of 5 to 100 μm, more preferably in the range of 10 to 50 μm. If it is less than 5 μm, the strength of the base paper will be weak, and if it exceeds 100 μm, the ink will pass through during printing. The sex may become worse.

For stencil printing base paper, for example, (1) a method of laminating a solvent-soluble resin film and a porous support with an adhesive or a pressure-sensitive adhesive, and (2) heat-sealing the solvent-soluble resin film to the porous support. Method, (3) A resin solution dissolved or dispersed in a solvent is applied on a porous support and dried,
Method of providing a solvent-soluble resin layer, (4) A resin solution dissolved or dispersed in a solvent is coated and dried on a releasable support to form a resin layer, which is then laminated with a porous support and then releasable. It can be produced by a method of peeling the support. FIG. 1 is a sectional view showing an example of a stencil printing base paper used in the present invention. In FIG. 1, stencil printing base paper 1
The solvent-soluble resin layer 2 is formed on the porous support 3.

As the solvent for dissolving the solvent-soluble resin layer used in the present invention, in addition to water, aliphatic hydrocarbon type, aromatic hydrocarbon type, alcohol type, ketone type, ester type,
Ether type, aldehyde type, carboxylic acid type, amine type,
Low molecular weight heterocyclic compounds, oxide-based solvents such as hexane, heptane, octane, benzene, toluene,
Xylene, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, butyl alcohol, ethylene glycol, diethylene glycol, propylene glycol, glycerin, acetone, methyl ethyl ketone, ethyl acetate, propyl acetate, ethyl ether, tetrahydrofuran, 1,4-dioxane,
Formic acid, acetic acid, propionic acid, formaldehyde, acetaldehyde, methylamine, ethylenediamine, dimethylformaldehyde, pyridine, ethylene oxide and the like can be mentioned. These can be used alone or in combination. In the above solvent, if necessary, a dye, a pigment, a filler, a binder, a curing agent, a preservative, a wetting agent, a surfactant,
A pH adjuster or the like can be included.

In the present invention, plate making of the stencil printing base paper is performed as follows. First, the solvent that dissolves the solvent-soluble resin layer is discharged in droplets by the solvent supply means on the surface of the solvent-soluble resin layer. As the solvent discharging means, 1
10 to 2000 pieces per inch (10 to 2000 dp
A nozzle, slit, syringe, porous member, porous film, or the like having an opening of i) connected to a piezoelectric element, a heating element, an electric field element, a liquid feed pump, or the like is used, depending on a character image signal. As a result, the solvent in the form of droplets can be discharged intermittently or continuously. At this time, the shape of the droplet is substantially spherical.

The selectively discharged droplet-shaped solvent flies as a substantially spherical droplet having a radius r ₁ (μm), and has a thickness d.
(Μm) on the solvent-soluble resin layer. The supplied solvent substantially has a radius r ₂ (μ
The resin component which spreads in a circle of m) and is in contact with the resin component is dissolved in the solvent, and the resin component is dissolved to a saturated solubility in the solvent.

The volume V ₁ of the liquid droplet having the radius r ₁ (μm) and the volume V _{2 of the} resin layer in contact with the solvent having the radius r ₂ (μm) are respectively expressed by the following equations (2) and ( Since it is represented by 3), the solubility S (%) of V ₂ with respect to V ₁ can be represented by the following formula (4). ^{_{V 1 = 4πr 1 3/3}} (2) V 2 = πr 2 2 × d (3) S = (V 2 / V 1) × 100 = ^{_{[πr 2 2 · d / (4πr}} 1 3/3) ] × ^{_{100 = 75d · r 2 2 /}} r 1 3 (4)

The solution in which the resin layer is dissolved with the solubility S of the above formula (4) is permeated and diffused into the porous support to perforate the solvent-soluble resin layer. In the plate making method of the present invention, the plate making is carried out under the condition that the solubility S satisfies the formula (1). That is, in the plate making method of the present invention, the solubility S is 0.1 to 1
In the range of 00, preferably 0.5 to 50, a droplet-like solvent is supplied for plate making. If the solubility S is less than 0.1 when supplying the solvent in the form of liquid droplets, the viscosity of the solution is lowered and the permeation and diffusion rate into the support is increased to obtain good perforation, but the resin layer becomes thin, so that the base paper The strength becomes weak. On the other hand, when the plate is made in a state where the solubility S is higher than 100, the strength as the base paper is increased, but the viscosity of the solution is increased and the permeation / diffusion rate to the support is slowed, so that good perforation cannot be obtained.

In general, r ₂ ≧ r ₁ , where r
_{If 1} = r ₂ , the equation (4) can be expressed by the following equation (5). S = 75d / r ₁ (5) Therefore, the equation (1) can be expressed by the following equation (6). 0.1 ≦ S = 75 d / r ₁ ≦ 100 (6)

FIG. 2 is a diagram showing the relationship between the size of the ejected droplet and the solubility with the thickness of the solvent-soluble resin layer as a parameter. In FIG. 2, when the horizontal axis represents the droplet size r ₁ (μm) and the vertical axis represents the solubility S (%), the relationship between the droplet size and the solubility with respect to the thickness d (μm) of the solvent-soluble resin layer is a linear relationship. Eggplant It can be seen from FIG. 2 that when the thickness d of the resin is thin, the droplet size to be discharged and supplied is smaller, and when the thickness d of the resin layer is larger, the droplet size is larger, which is more suitable for the plate making of the present invention. . An appropriate region of the plate making satisfying the above formula (6) is shown by A in FIG.

FIG. 3 is a diagram for explaining punching of the stencil printing base paper according to the present invention. In FIG. 3, the discharging solvent 5 is discharged from the discharging means 4 in a substantially spherical shape and comes into contact with the surface of the solvent-soluble resin layer 2 of the stencil printing base paper 1. The solvent 6 in contact with the resin layer dissolves the resin layer in the contact portion, the solution 7 permeates and diffuses into the porous support 3, and the perforated portion 8 is formed in the resin layer in the contact portion for plate making. . According to such a plate-making method, the stencil printing base paper can be plate-made in a non-contact state with the plate-making device, so that wrinkles and the like do not occur during plate-making.
Further, unlike the conventional heat-sensitive stencil sheet, the resin melt at the time of plate making does not remain in the perforated portion, and a clear printed matter can be obtained. Further, unlike the conventional heat-sensitive stencil sheet, it is possible to produce a stencil sheet without the need to impart releasability, friction and mechanical strength.

The stencil printing base paper prepared as described above can be used for general stencil printing. For example, place the ink on the stencil printing plate that was made, press,
It is possible to obtain a printed matter by passing the ink through the perforated portion with reduced pressure, a squeegee, etc., and transferring the ink to the superposed printing papers. Printing inks include oil-based inks, water-based inks, and water-in-oil droplets (W
/ O) type emulsion ink, oil-in-water (O / W) type emulsion ink and the like are used.

[0020]

EXAMPLES The present invention will now be specifically described with reference to examples, but the present invention is not limited thereto. Example 1 A 200-mesh polyester fiber cloth was coated with an adhesive solution having the following composition and dried, and then the coated surface had a thickness of 5
A μm polyvinyl alcohol film was stuck to produce a stencil printing base paper comprising a solvent-soluble resin layer and a porous support. Polyurethane (solid content 30% by weight) 50% by weight Isocyanate 5 〃 Ethyl acetate 25 〃 Toluene 20 〃

Next, a solvent having the following composition was ejected in the form of a letter image in the form of spherical droplets having a radius of 40 μm from an ejection means consisting of a nozzle of 400 dpi and a piezoelectric element, and was ejected onto the solvent-soluble resin layer of the above stencil printing base paper. Supplied. Then, the solvent on the resin layer spreads in a circle with a radius of 45 μm to dissolve the resin layer, and the solution penetrated and diffused into the polyester fiber cloth to perforate the solvent-soluble resin layer. Isopropyl alcohol 20 parts by weight Ethylene glycol 10 〃 Water 70 〃 The solubility S of the plate making conditions here was 11.9%. Next, place black oil-based ink on the stencil printing base paper that was made, and superimpose this base paper on the printing paper,
When the ink was squeegeeed with a blade, the same characters as the perforated parts were clearly printed.

Example 2 Polyvinyl ether film having a thickness of 10 μm and weighed 10
Japanese paper of g / m ² was superposed and passed through a heat roller at 120 ° C. to be stuck to produce a stencil printing base paper composed of a solvent-soluble resin layer and a porous support. Onto the solvent-soluble resin layer of this stencil printing base paper, the solvent was supplied by using the same discharging means and solvent as in Example 1. Then, the solvent on the resin layer spreads in a circular shape having a radius of 50 μm to dissolve the resin layer, and the solution was permeated and diffused into the Japanese paper to perforate the solvent-soluble resin layer.
The solubility S under the plate-making conditions here was 29.3%. When the stencil sheet thus prepared was used for printing in the same manner as in Example 1, a good printed matter was obtained.

Example 3 A silicone-treated polyester film was coated with a resin solution having the following composition by a roll coater and dried to form a solvent-soluble resin layer having a thickness of 3 μm. Vinyl chloride-vinyl acetate copolymer 20 parts by weight Toluene 50 〃 Methyl ethyl ketone 30 〃 Then, an adhesive solution having the following composition was dip-coated with Washi paper weighing 12 g / m ² and dried. Acrylic adhesive (solid content 40%) 50 parts by weight Toluene 50 〃 The solvent-soluble resin layer formed on the polyester film obtained above is laminated on the adhesive layer of Japanese paper, and then the polyester film is peeled off. Then, a stencil printing base paper was manufactured.

Next, a solvent having the following composition was discharged in the form of a character image as spherical droplets having a radius of 30 μm from a discharge means consisting of a nozzle of 600 dpi and a piezoelectric element, and was discharged onto the solvent-soluble resin layer of the above stencil printing base paper. Supplied. Then, the solvent on the resin layer spreads in a circular shape having a radius of 35 μm to dissolve the resin layer, and the dissolved solution permeated and diffused into the Japanese paper to perforate the solvent-soluble resin layer. Toluene 50 parts by weight 1,4-dioxane 30 〃 Methyl isobutyl ketone 20 〃 The solubility S of the plate making conditions here was 10.2%. Next, the stencil printing base paper thus prepared was set on a printing drum of Lithograph RC115 (manufactured by Ideal Science Co., Ltd.), and a printing operation was carried out to obtain a clear printed matter corresponding to the perforated portion.

Example 4 A 300 mesh polyester fiber cloth was coated with the same adhesive solution as in Example 3 and dried, and then a polycarbonate film having a thickness of 6 μm was superposed on the coated surface.
A stencil printing base paper consisting of a solvent-soluble resin layer and a porous support was produced. On the stencil printing base paper, a solvent having the following composition was discharged in the form of a character image in the form of spherical droplets having a radius of 40 μm from the discharging means used in Example 3, and was applied onto the solvent-soluble resin layer of the stencil printing base paper. Supplied. Then, the solvent on the resin layer spreads in a circle with a radius of 50 μm to dissolve the resin layer, and the solution penetrated and diffused into the polyester fiber cloth to perforate the solvent-soluble resin layer.

Methyl ethyl ketone 50 parts by weight Toluene 30 〃 Isopropyl alcohol 20 〃 The solubility S of the plate making conditions here was 5.8%. Next, on the polyester fiber side of the stencil printing base paper thus made, a black high-mesh ink for plit gokko (made by Riso Kagaku Kogyo Co., Ltd.) was placed, and this was placed on the printing paper, and printed gokko PG When printed with -10 (manufactured by Riso Kagaku Kogyo Co., Ltd.), characters similar to the punched portion were printed.

[0027]

EFFECTS OF THE INVENTION According to the method for making a stencil sheet of the present invention, perforation is performed in a non-contact state with a solvent, and the resin solution is permeated and diffused into the inside of the porous support. It is possible to eliminate the occurrence of wrinkles, defective conveyance, and the like. In addition, since a droplet-shaped solvent is supplied so as to have a solubility in an appropriate range during plate making to carry out plate making, a clear printed matter can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a stencil printing base paper used in the present invention.

FIG. 2 is a diagram showing a relationship between a discharge droplet size and solubility with a thickness of a solvent-soluble resin layer as a parameter.

FIG. 3 is an explanatory diagram of perforation of the stencil printing base paper according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base paper for stencil printing, 2 ... Solvent soluble resin layer, 3 ... Porous support, 4 ... Ejection means, 5 ... Ejection solvent, 6 ... Solvent in contact with resin layer, 7 ... Permeation and diffusion into porous support Resin solution, 8 ... Perforated resin layer.

Claims (1)

[Claims] 1. When a stencil printing base paper having a solvent-soluble resin layer formed on a porous support is perforated with a solvent to carry out plate making, a solvent in the form of droplets is applied to the surface of the solvent-soluble resin layer. The droplet radius r _{1 of} the solvent, the thickness d of the solvent-soluble resin layer, and the spread radius r _{2 of the} droplets supplied onto the resin layer in a non-contact state by the supply means are represented by the following formula (1). ^{_{0.1 ≦ 75d (r 2 2 /}} r 1 3) ≦ 100 (1) the relationship supply to dissolve the solvent-soluble resin layer of the supply portion so as to satisfy, the porous support lysis solution A method for making a stencil sheet, which comprises permeating and diffusing into the body.