JPH0781265A - Stencil printing base paper and its manufacturing method - Google Patents

Abstract

(57) [Abstract] [Purpose] A method for manufacturing a stencil printing base paper which is easy to manufacture and can reduce cost, and which does not cause perforation defects, wrinkles, conveyance defects and printing defects during plate making. provide. [Structure] A solvent-soluble resin solution is impregnated into a stencil printing base paper and a porous support, which are characterized in that a solvent-soluble resin film is formed in the porous support. A method for producing a stencil printing base paper, which comprises forming a solvent-soluble resin film. [Effect] You can make the plate from either side of the base paper,
Since the letter image can be engraved with a normal image, the plate making device can be simplified, and since it can be perforated in a non-contact state with a solvent, it is possible to eliminate perforation defects, wrinkles, and conveyance defects during plate making. Images can be obtained. Furthermore, since the stencil printing base paper can be manufactured by one manufacturing line, the manufacturing cost can be significantly reduced and the quality control can be facilitated.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a stencil printing base paper and a method for producing the same, and more particularly to a stencil printing base paper having a solvent-soluble resin coating in a porous support and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a stencil printing base paper, a heat-sensitive stencil base paper in which a thermoplastic resin film and a porous support are bonded together with an adhesive is known. This heat-sensitive stencil sheet, for example, (1) using a device that generates heat, such as a flash lamp, an infrared lamp, a handwritten manuscript or a prepared manuscript is overlaid with the heat-sensitive stencil paper and the thermoplastic resin film is heated by the heat of the device. (2) A method of melt-perforating a thermoplastic resin film by using a thermal head that generates character image information converted into an electric signal as dot-shaped heat, and contacting the thermal head with a heat-sensitive stencil sheet, etc. It is made by.

However, in the above plate making method, the heat-sensitive stencil sheet is brought into contact with the original or the thermal head which has absorbed heat and heat, and the heat is conducted to the thermoplastic resin film of the heat-sensitive stencil sheet to melt the thermoplastic resin film. Since it is necessary to go through a complicated process of perforating the thermoplastic resin film by cooling and shrinking the melt, for example,
(1) Poor punching due to poor adhesion between the thermoplastic resin film and the heat-absorbed original or thermal head,
(2) Perforation failure occurs due to uneven pressing pressure of the thermal head, and wrinkles occur on the heat-sensitive stencil sheet. (3) Melt of the thermoplastic resin adheres to the thermal head and conveyance failure of the heat-sensitive stencil sheet occurs. (4) The melt remains in the perforated portion, which hinders the ink from passing therethrough and causes printing defects.

Further, in recent years, further improvement in the quality of heat-sensitive stencil paper has been demanded. For example, the smoothness of the thermoplastic resin film, the releasability of the thermoplastic resin film from the original or the thermal head, and the heat of the thermoplastic resin film There is a demand for a heat-sensitive stencil sheet that satisfies the requirements of meltability and shrinkage, the adhesive strength between a thermoplastic resin film and a porous support, the strength and friction of the porous support, and therefore, the heat-sensitive stencil sheet is manufactured. There is a problem in that the conditions to be performed become complicated and the manufacturing cost increases.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, to facilitate the production of stencil sheet and to reduce the cost, and to prevent perforation defects, wrinkles, and conveyance during plate making. An object of the present invention is to provide a method for producing a stencil printing base paper that does not cause defects and printing defects.

[0006]

The inventions claimed in this application are as follows. (1) A stencil printing base paper, characterized in that a solvent-soluble resin film is formed in a porous support. (2) A method for producing a stencil printing base paper, which comprises impregnating a porous support with a solvent-soluble resin solution and drying the solution to form the solvent-soluble resin coating film in the porous support.

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, metal fibers and glass fibers are used alone. Alternatively, a thin paper, a non-woven fabric, a screen gauze and the like used by mixing them can be used. The basis weight of these porous supports is 1 to 20 g.
/ M ² range is preferable, and more preferably 5 to 15 g / m ²
Is the range. 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 5 to
The range is preferably 100 μm, more preferably 10 to 5
It is in the range of 0 μm. If the thickness is less than 5 μm, the strength of the base paper is weakened, and if it exceeds 100 μm, the ink permeability during printing may be deteriorated.

The solvent-soluble resin solution used in the present invention 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, polyisobutylene, 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.

The water-soluble resin component is a resin soluble in water or an organic solvent miscible with water, such as polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, hydroxyl ethyl cellulose, polyvinyl pyrrolidone, polyethylene-polyvinyl alcohol copolymer, Polyethylene oxide, polyvinyl ether, polyvinyl acetal, polyacrylamide, starch, dextrin, alkyne acid, ascorbic acid, water-soluble urethane, etc. are used. These resin components may be used alone or in combination, or as a copolymer.

Solvents for dissolving the above solvent-soluble resin components include aliphatic hydrocarbons, aromatic hydrocarbons, alcohols, ketones, esters, ethers, aldehydes, carboxylic acids, amines, Solvents such as low molecular weight heterocyclic compounds, oxides, and water are listed, and specifically, 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,
Examples include dimethylformamide, pyridine, ethylene oxide and the like. These may be used alone or in combination, but it is preferable to use a solvent having a good drying property from the viewpoint of the production efficiency of the base paper. If necessary, the solvent-soluble resin solution may contain 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.

The stencil sheet of the present invention is manufactured as follows. First, a solvent-soluble resin is dissolved in a solvent to prepare a resin solution. The resin concentration of the resin solution and the type of solvent used depend on the viscosity and surface tension of the resin solution, or the state of the resin film formed in the porous support differs depending on the type of the porous support used. It is preferable to appropriately select and adjust. Next, the porous support is impregnated with the resin solution and dried. The impregnation method is not particularly limited. For example, the porous support is dipped in a resin solution to sufficiently impregnate the porous support with the solution, and then the support is pulled up and dried. A resin coating containing a solvent-soluble resin component as a main component is formed in the porous support of the stencil printing base paper thus obtained, and the pores of the porous support substantially pass through the ink due to the resin coating. It is blocked to the extent that it is not allowed.

The thickness of the solvent-soluble resin coating is 0.1 to 1
The range is preferably 00 μm, more preferably 1 to 50 μm.
The range is m. If the thickness is less than 0.1 μm, the strength of the resin coating becomes insufficient, and if it exceeds 100 μm, a large amount of solvent is required to dissolve the resin coating during plate making, and the dissolution of the resin coating may become insufficient. In Figure 1,
The schematic cross-sectional view of the stencil printing base paper obtained by the production method of the present invention is shown. FIG. 1 (A) is a schematic cross-sectional view of a porous support,
(B) is a schematic cross-sectional view of a stencil printing base paper in which a solvent-soluble resin film is formed on a porous support, and (C) is a perspective view schematically showing the stencil printing base paper of (B). In the stencil printing base paper 4 of the present invention, the solvent-soluble resin film 2 is formed in the spaces between the fibers 3 of the porous support 1.

According to such a manufacturing method, there is no need for a complicated step of preparing a resin film or the like in advance and pasting the resin film and the porous support with an adhesive or the like as in the conventional method, and it is possible to obtain a single film. It can be manufactured on the manufacturing line, the manufacturing cost can be significantly reduced, and the quality control becomes easy. In addition, since the stencil printing base paper thus obtained does not have the front and back sides of the base paper, it is possible to make the plate from either side of the base paper, and it is necessary to make a character image as a mirror image like the conventional stencil printing base paper. Therefore, the plate making process and the plate making apparatus can be simplified.

Further, since the stencil printing base paper of the present invention has a solvent-soluble resin coating film, when a solvent that dissolves the resin coating film is supplied to the resin coating film, the resin component of the portion which comes into contact with the solvent is supplied. Dissolves in the solvent, and the resin dissolves to a saturated solubility in the solvent. The resin-dissolved solution adheres around the fibers of the porous support, and the resin film in this part is perforated. Therefore, the dissolved component does not remain in the perforated portion and obstruct the perforation. In addition, the perforability of the resin film is
It can be adjusted by controlling the solubility of the resin film in a solvent and the amount of contact solvent.

A solvent capable of dissolving the above-mentioned solvent-soluble resin can be used for plate making of the stencil printing base paper. The stencil printing base paper may be prepared, for example, by directly contacting a solvent impregnated brush pen or the like with the stencil printing base paper. It is preferable that the solvent-soluble resin coating is perforated by perforating the raw material to make a plate. FIG. 2 shows a plate making explanatory view of the stencil printing base paper of the present invention. 2 (A) is a schematic diagram of plate making. When the solvents 5 and 6 are discharged from the solvent discharging means 9 and the solvent comes into contact with the surface of the stencil printing base paper 4, the solvent-soluble resin film at the contact portion is dissolved. And pierce. 7 in the figure
Indicates a resin solution in which a resin component is dissolved and adhered to the fibers of the porous support, and 8 indicates a perforated portion of the resin coating. FIG. 2B is a perspective view schematically showing a stencil printing base paper that has been made.

As the solvent discharge device, for example, a nozzle,
Connect slits, syringes, porous materials, porous films, etc. to piezoelectric elements, heating elements, liquid feed pumps, etc. so that the solvent is intermittently or continuously discharged in the form of dots or lines according to the character image signal. An example of the device is
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 at the time of plate making does not remain in the perforated portion, and a clear printed matter can be obtained. Further, it can be manufactured without the need of imparting releasability, frictional property and mechanical strength unlike the conventional heat-sensitive stencil sheet.

The stencil printing base paper produced 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.

[0018]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. Example 1 A 280 mesh polyester fiber cloth was dipped in a resin solution having the following composition, and then pulled up and dried,
A resin coating having a thickness of 3 μm was formed in the gap between the fibers to produce a stencil printing base paper. Butyral resin 15 parts by weight Isopropyl alcohol 50 parts by weight Toluene 35 parts by weight

On the above-mentioned stencil printing base paper, a mixed solvent of the following composition was discharged in a character form from a discharge means equipped with a nozzle of 8 dots / mm and a piezoelectric element, and the resin film at the discharge portion was dissolved to form a hole. did. Toluene 50 parts by weight 1,4-dioxane 30 parts by weight Methyl ethyl ketone 20 parts by weight Next, a black W / O is formed on the stencil printing plate thus prepared.
When the type emulsion ink was placed, the base paper was overlaid on the printing paper, and the ink was squeegeeed by the blade, and clear characters similar to the punched portions were printed.

Example 2 A 200-mesh polyester fiber cloth was dipped in a resin solution having the following composition, and then pulled up and dried,
A resin coating having a thickness of 5 μm was formed in the spaces between the fibers to produce a stencil printing base paper. Polyester resin 20 parts by weight Toluene 50 parts by weight Ethyl acetate 30 parts by weight The above stencil printing base paper was prepared in the same manner as in Example 1,
Upon printing, good printed matter was obtained.

Example 3 Japanese paper having a basis weight of 10 g / m ² was dipped in a resin solution having the following composition, then pulled up and dried to form a resin film having a thickness of 3 μm in the gap between the Japanese papers for stencil printing. Produced base paper. Urethane resin 15 parts by weight Methyl alcohol 45 parts by weight Water 40 parts by weight On this stencil printing base paper, the ink of the ink jet printer is replaced with an aqueous solution having the following composition, and the aqueous solution is discharged from the printer. The stencil sheet was melted and perforated. Isopropyl alcohol 40 parts by weight Ethylene glycol 10 parts by weight Water 50 parts by weight Printed Gokko PG using the prepared stencil printing base paper
When printed with -10 (product name manufactured by Ideal Science Co., Ltd.), the character image recorded by the inkjet printer was clearly printed.

Example 4 A stencil sheet was prepared in the same manner as in Example 3 except that a resin solution having the following composition was used. Vinyl chloride-vinyl acetate copolymer 20 parts by weight Methyl ethyl ketone 40 parts by weight Toluene 40 parts by weight A mixed solvent having the following composition was discharged from an inkjet printer in the same manner as in Example 3 to make a plate, and a clear image was printed. was gotten. Methyl ethyl ketone 50 parts by weight Toluene 30 parts by weight Isopropyl alcohol 20 parts by weight

[0023]

According to the stencil sheet of the present invention, it is possible to plate-making from either side because there is no front and back of the base paper, also it is possible to plate making a character image with normal image,
It is possible to simplify the plate making device. Further, since perforation can be performed in a non-contact state with a solvent, it is possible to eliminate perforation defects, wrinkles, and conveyance defects during plate making, which makes it possible to print clear images. Further, according to the production method of the present invention, since the stencil printing base paper can be produced by one production line, the production cost can be greatly reduced and the quality control can be facilitated.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a stencil printing base paper obtained by the production method of the present invention, (A) is a schematic cross-sectional view of a porous support,
(B) is a schematic cross-sectional view of a stencil printing base paper in which a solvent-soluble resin film is formed on a porous support, and (C) is a perspective view schematically showing the stencil printing base paper of (B).

FIG. 2 shows a plate making explanatory view of a stencil printing base paper of the present invention,
(A) is a schematic diagram of plate making, and (B) is a perspective view schematically showing the prepared stencil printing base paper.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Porous support, 2 ... Solvent soluble resin film, 3 ... Fiber of porous support, 4 ... Stencil printing base paper, 5 ... Ejection solvent,
6 ... Contact solvent, 7 ... Resin solution in which resin component is dissolved and adhered to fibers of porous support, 8 ... Perforated portion of resin coating, 9
... discharge means.

Claims (2)

[Claims] 1. A stencil printing base paper, characterized in that a solvent-soluble resin film is formed in a porous support. 2. A method for producing a stencil printing base paper, which comprises impregnating a porous support with a solvent-soluble resin solution and drying the solution to form the solvent-soluble resin coating film in the porous support.