JPH07137473A - Screen printing stencil paper - Google Patents

Abstract

PURPOSE:To provide screen printing stencil paper not generating perforation inferiority, wrinkles, feed inferiority and printing inferiority at the time of plate making. CONSTITUTION:Screen printing stencil paper 1 is obtained by laminating a resin layer 2 soluble in an aq. solvent and a porous support 3 by an adhesive and/or a self-adhesive 4 and the adhesive and/or the selfadhesive is composed of a hydrophobia polymeric compd. The hydrophobic polymeric compd. has a solubility parameter of 10 or less and is dissolved and/or swollen by an ink component. The addition amt. of the adhesive and/or the self-adhesive 4 to the screen printing stencil paper is 0.1-50g/m<2>.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a stencil printing base paper,
More specifically, it relates to a stencil printing base paper having a resin layer soluble in an aqueous solvent.

[0002]

2. Description of the Related Art Conventionally, a heat-sensitive stencil sheet in which a thermoplastic resin film and a porous support are bonded with an adhesive is known as a stencil sheet. This heat-sensitive stencil sheet, for example, (1) using a device that generates heat, such as a flash lamp, an infrared lamp, superimpose a handwritten manuscript or a prepared manuscript on the heat-sensitive stencil paper, and heat the thermoplastic resin by the heat of the device. Method of melt-punching a film, (2) Method of melting and punching a thermoplastic resin film by using a thermal head that generates character image information converted into an electric signal as dot-shaped heat and bringing the thermal stencil sheet into contact with the thermal head It has been plate-made by etc.

However, in the above plate-making method, the heat-sensitive stencil sheet is brought into contact with the original or the thermal head that has absorbed heat to generate heat, and heat is conducted to the thermoplastic resin film of the heat-sensitive stencil sheet to melt the thermoplastic resin film. Then, since it is necessary to go through a complicated process of shrinking the melt and perforating the thermoplastic resin film, for example, (1)
Poor punching due to poor adhesion between the thermoplastic resin film and the heat-absorbing original or thermal head, (2) Poor punching due to uneven pressing pressure of the thermal head, and wrinkles on the heat-sensitive stencil sheet. (3) The melt of the thermoplastic resin adheres to the thermal head, resulting in poor conveyance of the heat-sensitive stencil sheet, (4) the melt remains in the perforated portion,
There is a problem in that the passage of ink is hindered and printing defects occur.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a stencil printing base paper which does not cause perforation defects, wrinkles, conveyance defects and printing defects during plate making. Is.

[0005]

The inventions claimed in this application are as follows. (1) A stencil printing base paper in which a resin layer soluble in an aqueous solvent and a porous support are bonded with an adhesive and / or a pressure sensitive adhesive, wherein the adhesive and / or the pressure sensitive adhesive is a hydrophobic polymer. A stencil printing base paper comprising a compound. (2) The stencil printing according to (1), wherein the hydrophobic polymer compound has a solubility parameter of 10 or less, and the hydrophobic polymer compound dissolves and / or swells with an ink component. Raw paper. (3) The adhesion amount of the adhesive and / or the adhesive is 0.
The base paper for stencil printing according to (1) or (2), which is 1 to 50 g / m ² .

The stencil sheet of the present invention has an adhesive and / or a pressure-sensitive adhesive composed of a hydrophobic polymer compound between a resin layer soluble in an aqueous solvent and a porous support. Thus, when an aqueous solvent is contacted with the resin layer, the aqueous solvent dissolves the resin component of the contact portion to a saturation solubility, and the solution in which the resin component is dissolved is then absorbed into the porous support, thus Perforation of the resin layer in the contacted portion becomes good. An adhesive composed of a hydrophobic polymer compound between a resin layer soluble in an aqueous solvent and a porous support, and / or
Alternatively, in the absence of a pressure-sensitive adhesive, the aqueous solvent in contact with the resin layer is selective to the porous support or hydrophilic adhesive etc. and the porous support before the resin component in the contact portion is sufficiently dissolved. Therefore, the resin layer cannot be sufficiently perforated.

Since the solution in which the resin component is dissolved penetrates into the porous support, the dissolved component does not remain in the perforated portion and hinders perforation. The perforability of the resin layer can be adjusted by controlling the dissolution rate of the resin layer in a solvent and the viscosity of the solution. The pressure-sensitive adhesive as used in the present invention may be any compound as long as it exhibits the pressure-sensitive adhesiveness required for bonding, and does not necessarily require the adhesiveness.

The solubility parameter (hereinafter referred to as SP value) of the hydrophobic polymer compound used as the adhesive and / or the pressure-sensitive adhesive is preferably 10 or less, more preferably 9.5 to 7.0. Hydrophobic polymer compound SP
When the value exceeds 10, the SP value of the high-boiling solvent, high-boiling oil, non-polar solvent such as machine oil and the oil contained as an oil component in the printing ink is usually 10 or less, and therefore the oil component in the ink As a result, the hydrophobic polymer compound is less likely to be dissolved and / or swelled, and ink permeability may be poor. Here, the SP value represents the cohesive energy density of the solvent and the solute, and is used to indicate the polarity of the substance. Generally, polymer materials have their own S
Good solubility is exhibited in a solvent having an SP value close to the P value.

As the hydrophobic polymer compound having an SP value of 10 or less, for example, styrene resin (SP value 9.0), acrylic resin (SP value 9.3), polyethylene (SP value 7.
9), polybutadiene (SP value 8.4), natural rubber (S
P value 8.2), styrene-butadiene copolymer (SP value 8.5), ethylene-vinyl acetate copolymer (SP value 9.
0) and the like. These resin components may be used alone or in combination, or may be used as a copolymer.

Hydrophobic as adhesive and / or adhesive
Adhesive amount of hydrophilic polymer compound is 0.1 to 50 g / m²Demon
Is preferably 0.5 to 30 g / m²A range of
Good Adhesion amount is 0.1g / m²Is less than the bonding strength
Is insufficient, 50g / m ²Oil in the ink
Dissolves and / or dissolves hydrophobic polymer compounds depending on the sex component
Takes a long time to swell and ink permeability decreases
It

As a method of bonding the resin layer soluble in an aqueous solvent and the porous support, for example, (1) a solution of a hydrophobic polymer compound dissolved or dispersed in a solvent is applied onto the porous support. After coating and drying, a method of laminating an aqueous solvent-soluble resin layer, (2) after impregnating a porous support with a solution of a hydrophobic polymer compound dissolved or dispersed in a solvent and drying, A method of laminating a solvent-soluble resin layer,
(3) A method in which a solution of a hydrophobic polymer compound dissolved or dispersed in a solvent is applied on an aqueous solvent-soluble resin layer and dried, and then a porous support is attached thereto can be used.

As the resin layer soluble in an aqueous solvent, a film formed in advance can be used. However, even if the resin component is dissolved in a solvent, it is coated on a peelable film and dried, Alternatively, it may be produced by directly coating on the adhesive and / or pressure-sensitive adhesive layer and drying. The peelable film is peeled off after the resin layer is attached to the porous support.

The aqueous solvent-soluble resin layer used in the present invention contains as a main component a resin soluble in water or an organic solvent miscible with water. As such a resin layer,
Examples thereof include polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyvinylpyrrolidone, polyethylene-polyvinyl alcohol copolymer, polyethylene oxide, polyvinyl ether, polyvinyl acetal, polyacrylamide and the like. These resin components may be used alone or in combination, or as a copolymer. Further, it may contain a dye, a pigment, a filler, a binder, a curing agent, etc., if necessary. The thickness of the resin layer is usually 0.1 to 100 μm, preferably 1 to 50 μm from the viewpoint of strength and the amount of solvent required for perforation.

Examples of the porous support used in the present invention include natural fibers such as Manila hemp, pulp, Mitsumata, Kozo and Japanese paper, synthetic fibers such as polyester, nylon, vinylon and acetate, non-woven fabrics, metal fibers and glass fibers. Examples include thin paper, non-woven fabric, screen gauze and the like, which are used alone or in combination. The basis weight of these porous supports is preferably in the range of 1 to ²⁰ g / m ² , more preferably 5
It is in the range of up to 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. Further, 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. May get worse.

As a solvent for dissolving the resin layer soluble in an aqueous solvent, in addition to water, alcohols, ketones, esters, ethers, aldehydes, carboxylic acids, amines, low molecular weight heterocyclic compounds, Oxide type is used,
Specifically, water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, butyl alcohol, ethylene glycol, diethylene glycol, propylene glycol, glycerin, acetone, methyl ethyl ketone, ethyl acetate, ethyl ether, tetrahydrofuran, 1, 4-dioxane, formic acid,
Examples thereof include acetic acid, propionic acid, formaldehyde, acetone aldehyde, methylamine, ethylenediamine, dimethylformamide, pyridine and ethylene oxide. These can be used alone or in combination. Further, if necessary, a dye, a pigment, a filler, a binder, a curing agent, a preservative, a wetting agent, a surfactant, a pH adjusting agent and the like can be added.

The stencil printing base paper of the present invention may be prepared by directly contacting the resin layer soluble in the aqueous solvent with a means such as a pen pen impregnated with the aqueous solvent. It is preferable that an aqueous solvent is supplied to the resin layer in a non-contact state by, for example, perforation to punch the plate. As the aqueous solvent discharging means, for example, a nozzle, a slit, a syringe, a porous material, a porous film or the like is connected to a piezoelectric element, a heating element, a liquid feed pump or the like, and the solvent is intermittently or continuously supplied in accordance with a character image signal. That is, there is an apparatus that discharges in a dot shape or a line shape. According to such a 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 during plate making does not remain in the perforated portion, and a clear printed matter can be obtained. Further, unlike conventional heat-sensitive stencil paper, it is not necessary to impart releasability, friction and mechanical strength.

The stencil sheet of the present invention can be used for ordinary stencil printing. For example, an ink is placed on a plate made by plate making, the printing paper is superposed on the other surface, and the ink is transferred to the printing paper by passing through the perforated portion by means of pressing, depressurizing, squeegee, etc. To get As the printing ink, an oil-based ink, a water-in-oil (W / O) type emulsion ink or the like used in conventional printing is used. The oily components of these inks include liquids such as high-boiling point solvents, high-boiling point oils, machine oils, and surfactants for the purpose of fluidity, permeability, stability, etc. of the ink. Causes contact with a hydrophobic polymer compound used as a contact agent and / or a pressure-sensitive adhesive to dissolve and / or swell, so that ink can easily pass through.

FIG. 1 is a sectional view of a stencil printing base paper showing an example of the present invention. In the figure, the stencil sheet 1 is
The porous support 3 and the resin layer 2 soluble in an aqueous solvent are laminated with an adhesive and / or a pressure sensitive adhesive 4. FIG. 2 is an explanatory diagram of perforation of a stencil printing base paper showing an example of the present invention. In the figure, the aqueous solvent 5 is discharged from the discharging means 9 and comes into contact with the surface of the resin layer 2 soluble in the aqueous solvent. The contact aqueous solvent 6 dissolves the resin layer in the contact portion to form a resin solution, passes through the gap between the adhesive and / or the pressure sensitive adhesive 4 and permeates into the porous support 7, and the resin layer in the contact portion is perforated. . Reference numeral 7 is a resin solution that has penetrated into the porous support, and 8 is a perforated resin layer. FIG. 3 is a printing explanatory view of a stencil printing base paper showing an example of the present invention. In the figure, when the ink 10 is placed on a resin layer soluble in an aqueous solvent of the stencil printing base paper 1 and a squeegee is applied, the ink 10 is transferred from the perforated portion to the printing paper 13 via the porous support. Reference numeral 11 is the ink that passes through the perforations, and 12 is the ink that has been transferred onto the printing paper.

[0019]

EXAMPLES The present invention will now be specifically described with reference to examples, but the present invention is not limited thereto. In addition, the part in an example means a weight part. Example 1 15 parts of polyethylene oxide, 15 parts of isopropyl alcohol and 7 parts of water on a silicone treated release paper.
A resin solution consisting of 0 parts was applied by a reverse coater and dried to form a resin layer soluble in an aqueous solvent having a thickness of 3 μm.
Next, a 300-mesh polyester fiber cloth was dipped in an adhesive solution consisting of 20 parts of an acrylic resin (SP value 9.3), 5 parts of isocyanate, 45 parts of toluene and 30 parts of ethyl acetate, and then pulled up and dried. The amount of adhesive adhered after drying was 5 g / m ² . The above-mentioned resin layer was overlaid on the polyester fiber cloth to which this adhesive had been adhered, and allowed to stand overnight in a constant temperature bath at 40 ° C., and then the release paper on the resin layer was peeled off to produce a stencil printing base paper.

On the resin layer surface of the obtained stencil printing base paper, 8
From the ejection means equipped with dot / mm nozzles and piezoelectric elements,
20 parts of isopropyl alcohol, 1 part of ethylene glycol
An aqueous solution consisting of 0 part and 70 parts of water was discharged in a letter shape, and the resin component (polyethylene oxide) in the discharged part was dissolved and perforated. 10 parts of carbon black, 20 parts of alkyd resin, 10 parts of rosin-modified phenolic resin, and Nisseki No. 4 solvent 6 were placed on the stencil printing plate prepared.
When a black oil-based ink consisting of 0 parts was placed, a printing paper was superposed on the other surface of the base paper, and the ink was squeegeeed with a blade, the same characters as the perforated parts were clearly printed.

Example 2 In Example 1, as an adhesive solution, 20 parts of ethylene-vinyl acetate copolymer (SP value 9.0) and 40 parts of toluene were used.
A base paper for stencil printing was produced in the same manner as in Example 1 except that a solution consisting of 40 parts of methyl ethyl ketone and 40 parts of methyl ethyl ketone was used. The amount of adhesive adhered was 10 g / m ² . The obtained stencil printing base paper was subjected to plate making and printing in the same manner as in Example 1, and a good printed matter was obtained.

Example 3 15 parts of polyvinyl ether, 15 parts of methyl alcohol and 7 parts of water were placed on a polypropylene film having a thickness of 40 μm.
A resin solution consisting of 0 parts was applied by a reverse coater and dried to form a resin layer soluble in an aqueous solvent having a thickness of 3 μm.
Next, an adhesive solution consisting of 20 parts of polybutadiene (SP value 8.4) and 80 parts of toluene was applied and dried on a 300 mesh polyester fiber cloth with a gravure coater to adhere 10 g / m ² of the adhesive. . Next, the pressure-sensitive adhesive surface and the above-mentioned resin layer are superposed on each other and 5 kg / cm ²
The polypropylene film was peeled from the resin layer, and the base paper for stencil printing was manufactured.

8 dots / mm on the obtained stencil printing base paper
15 parts of isopropyl alcohol, 5 parts of glycerin and 80 parts of water from the solvent discharge means equipped with the nozzle and the heating element
The aqueous solution consisting of parts was discharged in a letter shape, and the resin component (polyvinyl ether) in the discharged part was dissolved and perforated. Next, the same oil-based ink as in Example 1 was placed on the prepared stencil printing paper, printing papers were overlaid, and press printing was performed, but the same characters as the perforated portions were clearly printed. It was

Example 4 A polyvinyl alcohol film having a thickness of 5 μm was coated with a pressure-sensitive adhesive solution consisting of 30 parts of styrene-butadiene copolymer (SP value 8.5) and 70 parts of toluene and dried to give 15
After depositing the adhesive g / m ^2, it was produced stencil sheet by superposing paper having a basis weight of 12 g / m ² laminated with a pressure roller 5 kg / cm ^2. The obtained stencil printing base paper was subjected to plate making and printing in the same manner as in Example 3, and a good printed matter was obtained.

Example 5 A polypropylene film having a thickness of 40 μm was coated with a resin solution consisting of 15 parts of polyvinyl acetal, 15 parts of isopropyl alcohol and 70 parts of water by a reverse coater and dried to be soluble in an aqueous solvent having a thickness of 3 μm. A resin layer was formed. Next, an adhesive solution consisting of 20 parts of styrene resin (SP value 9.0), 40 parts of toluene and 40 parts of methyl ethyl ketone was applied onto the resin layer with a gravure coater so that the adhesion amount after drying was 10 g / m ^2. Was applied to the stencil sheet, and the undried state was superposed on Japanese paper having a basis weight of 12 g / m ² and then dried to obtain a stencil printing base paper. The obtained stencil printing base paper was subjected to plate making and printing in the same manner as in Example 3, and a good printed matter was obtained.

[0026]

EFFECTS OF THE INVENTION According to the stencil printing base paper of the present invention, since it is possible to perforate in a non-contact state with an aqueous solvent, it is possible to eliminate perforation defects, wrinkles and conveyance defects during plate making. Further, since the hydrophobic polymer compound is used as an adhesive and / or a pressure-sensitive adhesive, the resin layer can be sufficiently and clearly perforated with an aqueous solvent. Furthermore, since the hydrophobic polymer compound is dissolved and / or swelled by the ink component, the ink can pass through well during printing, and a clear printed matter can be obtained.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of perforation of a stencil printing base paper showing an example of the present invention.

FIG. 3 is a printing explanatory view of a stencil printing base paper showing an example of the present invention.

[Explanation of symbols]

1 ... Stencil printing base paper, 2 ... Water-soluble solvent-soluble resin layer, 3
... Porous support, 4 ... Adhesive and / or adhesive, 5
... Aqueous solvent, 6 ... Contact aqueous solvent, 7 ... Resin solution that has penetrated into the porous support, 8 ... Perforated resin layer, 9 ... Ejection means, 10 ... Ink, 11 ... Ink that passes through the perforated portion,
12 ... Ink transferred onto the printing paper, 13 ... Printing paper.

Claims (3)

[Claims] 1. A base paper for stencil printing, wherein a resin layer soluble in an aqueous solvent and a porous support are bonded together with an adhesive and / or a pressure-sensitive adhesive, wherein the adhesive and / or the pressure-sensitive adhesive is hydrophobic. A stencil printing base paper, which is made of a polymer compound. 2. The solubility parameter of the hydrophobic polymer compound is 10 or less, and the hydrophobic polymer compound dissolves and / or swells with an ink component. Base paper for stencil printing. 3. The stencil printing base paper according to claim 1, wherein the amount of the adhesive and / or the pressure sensitive adhesive attached is 0.1 to 50 g / m ² .