JPS62198459A - Production of thermal stencil original form - Google Patents

Abstract

PURPOSE:To facilitate a production of a thermal stencil original form having porous pore portions uniform in the size, shape, and distribution, by a method wherein a radiation curing resin liquid is applied to a surface of a roll having recessed portions so as to make the resin liquid exist only in the recessed portions, and in this condition a film is brought into close contact with the roll to bring the resin liquid into close contact therewith and thereafter removed from the roll. CONSTITUTION:A radiation curing resin liquid 4 is applied to a reverse gravure roll 1 with pickup rolls 5 and thereafter the resin liquid existing on the portion other than recessed portions is removed by a doctor knife 6 so that the resin liquid is made to exist only in the recessed portions. After that, for example, a polyester film of 4mum thick is fed by a feed roll, and treated with corona at a contact face with the reverse gravure roll 1 to be brought into close contact with the reverse gravure roll 1 by a nip roll 7. In this condition, an electron beam irradiation is applied to cure the resin liquid remaining only in the recessed portions. After that, the composit body made of the cured resin film and the film is removed from the reverse gravure roll 1 by a nip roll 12 to be taken up.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for producing a heat-sensitive stencil plate,
More specifically, the present invention relates to a method for producing a heat-sensitive stencil plate that allows high-quality printed matter to be obtained using a simple stencil printing method.

(Prior Art) A heat-sensitive stencil plate having a basic structure in which a thermoplastic film and an ink-permeable support are bonded together with an adhesive is known.

The ink-permeable supports (hereinafter referred to as "supports") used in these conventional original plates are, for example,
As shown in Publication No. 23719, natural fibers such as mitsumata, kozo, Manila hemp/zelte, etc. or rayon,
Synthetic fibers such as vinylon, tetoron, acrylic, etc., alone or in combination (hereinafter referred to as "Japanese paper"), or those made by, for example, Japanese Patent Application Laid-Open No. 59-22796 (
A mesh-like sheet as shown is used.

Furthermore, for example, Japanese Patent Application Laid-Open No. 60-87095 proposes a heat-sensitive mimeograph paper in which a large number of fibers are arranged substantially parallel to each other at predetermined intervals in only one direction and adhered to one surface of the film. It has been proposed to use a material in which a large number of fibers are substantially parallel to each other at predetermined intervals as an alternative to Japanese paper or MEC-like sheet supports.

Furthermore, Japanese Patent Publication No. 49-5934 states, ``A heat-sensitive resin layer having nine patterns of closed shapes on a thermoplastic film and which does not substantially soften or melt at the temperature at which the film is perforated. ``Formal certified copy printing base paper'' has been proposed. In this case, the so-called support is a heat-resistant resin layer with a substantially closed shape.

(Problems to be Solved by the Invention) However, as shown in the table above, the heat-sensitive stencil plate that has been proposed so far has problems with printing quality, but it is a heat-sensitive stencil plate that is made by bonding a thermoplastic film (hereinafter referred to as "film") and Japanese paper with an adhesive. The reality is that the original version is widely used. That is, first of all, the most widely used thermal stencil plate is a thermal stencil plate in which a tτ film and Japanese paper are bonded together with an adhesive, and if necessary, a release hole is provided on the film, and the infrared absorbing original and the film surface of the thermal stencil plate are tightly pressed together. A heat-sensitive stencil plate in which the film is melted or shrunk by the heat generated in the image area of the infrared-absorbing original by irradiating infrared rays from the Japanese paper side while the paper is in a state of infrared rays, thereby forming a perforated image in the film corresponding to the original image. As described in JP-A No. 60-87095, the original version is a portion where the thickness of the Japanese paper fibers, the size, shape, and distribution of the openings in the Japanese paper are uneven, and where the fibers overlap in the thickness direction. 0) Japanese paper, that is, the support itself, has different ink flow resistance in each part, and the print image density differs depending on the part due to the influence of the support itself.

(b) When forming a perforated image corresponding to the original image by irradiation with infrared rays, the fibers of Japanese paper absorb a certain amount of infrared rays, so due to the above characteristics, the amount of infrared rays that reaches the original image differs depending on each part, resulting in As a result, perforation properties differ depending on the location.

(c) For example, JP-A-55-103957. 60-97
As exemplified in Japanese Patent No. 891, a method is also known in which a thermal element such as a thermal head is pressed against a heat-sensitive stencil blank to form holes in a desired image. In this case, even if the heat element generates a certain amount of heat, the washi paper that exists between the film and the platen roll has the above characteristics, and the area with dense fibers has poor insulation properties, and as a result, the film actually heats up. The heating temperature varies depending on each part, making uniform perforation impossible.

As mentioned above, heat-sensitive stencil plates using Japanese paper as a support are affected by the effects of 0) and ←) or e above, resulting in low printed image density and areas with high density, as well as areas with high density. Since it is not performed uniformly, there is a problem in that the resolution is also poor.

On the other hand, if a mesh-like sheet is used as a support, the above problems can be almost solved, but it is too expensive to be used as a support for a heat-sensitive stencil plate, so it is not used except for special purposes. Despite the above-mentioned problems, the reality is that Japanese paper is mostly used as a support.

In order to solve such a problem, there was proposed the method of ``substantially closed shape on a thermoplastic resin film'' described in the above-mentioned Japanese Patent Publication No. 49-5934 of the present applicant. Thermal mimeograph printing base paper having a heat-resistant resin layer that does not substantially soften or melt at the temperature at which the film of the agglomeration pattern is perforated can obtain good printed images, unlike those using Japanese paper as a support. Although it was an excellent book in terms of being able to do so, it still had the following problems.

That is, gravure, offset, or flexographic printing is used as a means of forming a heat-resistant resin layer on a thermoplastic resin film in a substantially closed-shaped assembled pattern that does not substantially soften or melt at the temperature at which the film is perforated. Even if the gravure printing method, which is inexpensive but can form the thickest heat-resistant resin 14, is used, the resin can only be transferred to a thickness of about 50 inches, which is the gravure depth, onto the film. Further, when the solid content of the resin liquid forming the resin layer is low, the heat-resistant resin layer becomes thinner, and there is a problem that it lacks strength as a support and lacks printing durability.

Furthermore, during the process of transferring the resin liquid onto the film using gravure and curing or forming a film, the shape controlled by gravure may collapse, and in severe cases, a uniform heat-resistant thin film may form, reducing the perforability of the film. There was a problem that quality stability was lacking.

On the other hand, the original plate obtained by uniformly coating a film with a resin that can be crosslinked into three dimensions by light irradiation, irradiating it with light according to the pattern, and removing the uncrosslinked resin in the unexposed areas with a solvent has a support thickness of the desired thickness. Although it is possible to use washi paper to print images and print durability, it is difficult to use washi paper due to the use of solvents, washing out uncrosslinked parts, and washing out the resin that crosslinks into three-dimensional form when exposed to light. The problem is that it is quite expensive compared to what it is used for.

(Means and effects for solving the problems) The present inventors have discovered that unlike the conventional heat-sensitive stencil plate using Japanese paper as a support, there is no deterioration in the printed image quality, and the heat-sensitive stencil plate using the mesh-like sheet does not deteriorate. Printing is not as expensive as it seems! As a result of intensive research into the production method of thermal stencils with excellent IIF image quality,
This led to the completion of the present invention.

Particularly, the present invention provides a roll or an endless belt (hereinafter referred to as a gravure roll, etc.) having a pattern in which a large number of substantially closed shapes are arranged closely and independently on the surface, and the rest of the pattern is etched into recesses. ) Apply radiation-curable resin fL to the surface, remove the resin liquid from areas other than the concave areas, stick the film tightly with the resin liquid interposed only in the concave areas, irradiate radiation from the film side, and cure with radiation. The method is characterized in that after the mold resin is cured and the film and the radiation-cured resin are bonded together, the film and the radiation-cured resin bonded thereto are peeled off using a gravure roll or the like.

In the present invention, a substantially closed non-turn is a collection of portions surrounded by continuous lines that are substantially closed like a mesh, and includes a circular, oval, square, diamond, and polygonal shape. Alternatively, a combination of these may be used, but a circular shape is relatively preferable.

Further, the size of the shape 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 desirable to have a size of about 20 μφ to 150 μφ. In addition, the density of the shape can be arbitrarily selected depending on the desired resolution, but in general, the higher the density, the better.For example, when the shape is circular, it is more preferably 120 meshes or more than 120 meshes. That's all.

As a means for forming the concave portions of such an aggregate, a known means for creating a gravure printing plate can be suitably employed.

The radiation-curable resin liquid as used in the present invention refers to a resin liquid that can be cured by electron beams or ultraviolet rays, and those that are not liquid at room temperature but can become liquid by heating can also be suitably used. Such radiation-curable resin liquids are well known to those who handle radiation-curable resin liquids, and include, for example, polyester acrylate, di-I xyacrylate, urethane acrylate, polyether acrylate, melamine acrylate, and alkyd acrylate. , acrylic acrylate,
For example, vinylpyrrolidone, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-
Hydroxyethyl acrylate, 2-hydroxyethyl acryloyl phosphate, calpitol, acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, isogelnylacrylate, zocyclopenranyloxyethyl acrylate), N, N
'-dimethylaminoethyl acrylate, 2-(N-methylcarbamoyl)acrylate.

1.3 butanezoldiacrylate, 1,4butanediol diacrylate, 1.6-hexanodiol diacrylate, diethylene glycol noacrylate, triethylene glycol quaacrylate, tetraethylene glycol noacrylate, polyethylene glycol diacrylate, neo Pentyl glycol diacrylate, hydroxypiparic acid ester neopentyl glycol diacrylate, 1,3-bis(3'-acryloxyethoxy-2'-hydroxypropyl) -5,5
- A suitable amount of reactive diluent such as zomethylhydantoin, trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate is added as a crosslinking agent and viscosity control agent in consideration of the physical properties of the final cured product, and If necessary, an electron beam curable resin liquid to which storage stabilizers, dyes, pigments, waxes, silicones, viscosity control agents, surface tension control agents, plasticizers, etc. are added, for example acetophenone, 2.2- Shedkin acetophenone, p-trimethylaminoacetophenone, p-zomethylaminoderopiophenone, benzophenone, 2-10 lopenzophenone, p,p'-nochloropenzophenone, p,p'-diethylaminobenzophenone, Michler's ketone, pentyl , benzoin, benzoin methyl ether, benzoin ethyl ether,
Benzoin isopropyl ether, pentuin-n-propyl ether, benzoin isobutyl ether, pentyl dimethyl ketal, tetramethylthiuram monosulfide, thioxanthone, 2-chlorothioxanone, 2-methylthioxanthone, azobisisobutyronitrile, benzoin/ 4'-oxide, no tart-
Butyl peroxide, 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-one 1.1-(4-inpropyl)-2
-Add one or more photopolymerization initiators such as -hydroxy-2-methylzolo/IP-1-one, methylbenzoyl formate, and if necessary, further e.g. n-butylamine, non-n-butylamine, triethyleneamine, Amines such as ethylenetetramine, urea compounds such as allylthiourea, o-)lylthiourea, -sodium diethyldithiophosphate, l-pentluiso-
f in uronium-p-toluenesulfine, R1,R
2 is a methyl group, ethyl group, β-cyanoethyl group or β
- N, N represented by (selected from chloroethyl group)
-Di-11-p-aminobenzonitrile compounds, tri-n-butylphosphine, sodium, phosphorus compounds such as diethyldithiophosphate, N-nitrosohydroxyl amine derivatives, oxazolidine compounds, tetrahydro-1,3-oxacin compounds, etc. Other chlorocompounds,
Examples include resin liquids that can be cured by ultraviolet rays by adding one or more chlorine compounds such as carbon tetrachloride and hexachloroethane, and sensitizers such as triethanolamine triacrylate.

Any method may be used to apply these resin liquids to a gravure roll, etc., such as pouring the liquid into a nokun and immersing the gravure roll, etc. in the liquid, or applying the liquid to the gravure roll, etc. from a pan through a pick-up roll or fountain. Alternatively, the liquid may be cast onto a gravure roll or the like. At this time, it is also effective to heat the resin liquid, gravure roll, etc. to an appropriate temperature in order to appropriately control the viscosity of the resin liquid.

When applying resin liquid to gravure roll etc. in this way,
Naturally, the resin liquid is applied to areas other than the recessed areas, but in order to remove the adhered resin other than the recessed areas, a metal or oak doctor knife is pressed against a gravure roll, etc. to remove the resin liquid other than the recessed areas. The resin liquid may be present only in the recesses.

Further, the film used in the present invention may be one that can be melted and shrunk and perforated by heat; for example, a stretched film of thermoplastic resin such as polyester, polypropylene, polyvinyl chloride, or polyvinylidene chloride is preferably used. It will be done. The thickness of the film is preferably about 1 to 20 microns.

Furthermore, the adhesion between the film and radiation-cured resin is 1.517c.
If it is more than m, there is no practical problem, but if necessary, the surface to be bonded to the radiation-cured resin may be corona treated in advance to improve adhesion, an intermediate layer may be interposed to improve adhesion, or image processing may be necessary. It is also possible to take measures to increase the adhesion force by using them together.

The material used for this intermediate layer may be selected as appropriate depending on the type of radiation-curable resin and the type of film used.
For example, imine-based, titanate-based, incyanate-based anchoring agents and polyvinyl acetate.

I-reacrylate, polymethacrylate, polyvinyl chloride, vinyl chloride/vinyl acetate copolymer, polyvinylidene chloride, polyacrylonitrile, I-rivinyl tama-chill, polycargonate, thermoplastic polyester.

I-lyamide, diene plastic, polyurethane plastic, chlorinated I-lyethylene, chlorinated I-lipropylene, polyvinyl butyral, cellulose plastic, polyvinylpyrrolidone, 7-malonindene resin, natural rubber, butadiene rubber, etc. alone or in combination What is necessary is to dissolve it in a solvent or make an emulsion and apply it to the film. Additionally, additives such as plasticizers, dyes, and pigments may be added to these. The thickness of the intermediate layer is sufficiently thin, and a thickness of about 0.01 .mu.m to 2 .mu.m is sufficient.

(9) To bring the film into close contact with the resin liquid present only in the concave portions, the film may be pressed into close contact with a roll that can be pressed, such as a gravure roll.

Further, the film may be brought into close contact with the film under reduced pressure so as not to trap air between the film and the film.

In this way, the film is brought into close contact with the resin liquid confined only in the recesses, and radiation is irradiated to cure and adhere the resin liquid, thereby reliably forming a bonded body having a single film portion that complements the shape of the recess assembly. Next, the film and the bonded body, which is the resin bonded to it and cured by swallowing radiation, are peeled off using a gravure roll, etc., but a release agent such as a fluorine-based compound or a silicone compound is applied to the surface of the gravure roll to make it easier to peel off. It is also effective to do so.

As mentioned above, the reason why the resin liquid applied to the gravure roll etc. in the present invention is limited to radiation-curable resin is the result of various studies. When a thermosetting resin liquid is used, when the resin liquid is heated and cured, even if the film is not perforated, it generally begins to shrink, making it impossible to form a base paper with good flatness. ←)
There are room temperature curing types and moisture curing types of curing resin liquids, but they require time to cure, resulting in poor productivity and high costs. (c) Resin solutions or emulsions dissolved in solvents, etc. When using resin as a resin liquid, it is necessary to apply a film to the resin and heat it to form a film, which not only causes the same problem as in item (a), but also causes the gravure roll, etc. to be tightly adhered to the film. Due to the generation of solvent vapor,
There is a problem that the film partially lifts up from the gravure roll etc., making it impossible to form a resin film in the desired shape.The purpose of the present invention can only be achieved without the above problems by using a radiation-curable resin. I got it.

(Example) 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.

In Fig. 1, the roll has 160 circular non-concave portions of approximately 80 μφ per 25.4 +++ m length (hereinafter referred to as “reverse gravure roll”), the depth of the concave portions is 39 μ, and the roll surface has Strong tetrachlorethylene coated with Frontier Ceraco B manufactured by Frontier Co., Ltd.
An i-type thin film of ceramic film was formed. Note that the roll was used while being heated to 60°C. 2. is an electron beam irradiation device, and is equipped with a -order shield. 3. The radiation curable resin liquid was added at 41 degrees Celsius, and in this example, the tube was heated to 75°C. 4. is a radiation-curable resin liquid, and the following composition was used in this example.

Resin liquid composition 5 is a female Kutuara roll of resin liquid, and in this example, this roll is also heated to 75°C. 6. is a doctor knife, which removes the resin liquid applied to the reverse gravure roll 1 other than the concave portions.

Reference numeral 7 is a Nitzo roll, which is a roll for bringing the fed film into close contact with the reverse gravure roll 1. Reference numeral 8 is a film feed roll, and reference numeral 9 is a composite of the cured resin film and the film, in which the resin liquid remaining only in the concave aggregates is cured in close contact with the film, and the shape is integrated with the film. 10 is a corona treatment machine for improving the adhesion between the film and the radiation-curable resin,
11 is a take-up roll of the composite body 9, 12 is another nip roll, and 13 is a secondary radiation shield for stability.

In this embodiment, a resin liquid having the above composition is used as the radiation-curable resin liquid, and the resin liquid 4 is applied to the reverse gravure roll 1 using a pick-up roll 5, and the resin liquid other than the concave portions is removed using a doctor knife 6, and the resin liquid 4 is applied to the concave portions. Only resin liquid was present. Next, a 4μ thick /17 ester film was rolled out from the film feed roll, the contact surface with the reverse gravure roll 1 was corona treated, the film was brought into close contact with the reverse gravure roll 1 using the nip roll 8, and in this state it was irradiated with an electron beam. Then, the resin liquid remaining only in the recesses was cured. The composite of the resin film and the film cured by another nip roll at position 12 was peeled off from the reverse gravure roll 1 and wound up. In this manner, a heat-sensitive stencil plate according to the manufacturing method of the present invention was obtained.

When the heat-sensitive stencil plate obtained in this manner was observed under a microscope, it was confirmed that it was a composite material in which there were 160 areas containing only films of about 80 μΦ in regular arrangement per 25.4 mm length. Ta. Note that the thickness of the composite was approximately 43μ.

Sodium stearate was applied to the film surface of the heat-sensitive stencil plate obtained in this way at 0.51/m"@ to give it releasability from the original. The result is a high-quality printed material similar to a table-top offset printed material that is extremely sharp, has good resolution, and has uniform image density. was obtained.As a precaution, I printed 3000 sheets, but the original plate did not show any tearing, and the print quality remained unchanged from when printing started, resulting in high-quality printed matter.For comparison, there are many commercially available Using a heat-sensitive stencil plate with Japanese paper as a support, plate making and printing were carried out in the same manner as above.
As a result of printing, density unevenness was noticeable in the solid area on the opposite side, and the sharpness was considerably inferior to the product of the present invention.

Example 2 In the schematic diagram showing an example of the manufacturing method of the present invention shown in FIG. 1, the electron beam irradiation device 12 was replaced with an ultraviolet irradiation device, and the secondary shield was removed. A heat-sensitive stencil original according to the manufacturing method of the present invention was prepared using the apparatus shown schematically in the following manner.

Using the above materials, the inverse gravure roll 1, bread 3 and pick-up roll 5 shown in Fig. 1 were made. Husband 40
℃, and a heat-sensitive stencil original was prepared by the method of the present invention in the same manner as in Example 1.

The result of observing the heat-sensitive stencil plate obtained in this way with a ms mirror is 25
．． It was confirmed that this was a composite body in which there were 160 portions consisting only of film layers, each having a size of about 8oμΦ and being regularly arranged per 4mm length. Moreover, the storage capacity of the composite was approximately 40μ.

A surfactant (Emarun 905 manufactured by Kao Corporation) was applied to the film surface of the heat-sensitive stencil master thus obtained at a rate of 0.4.9/m.
61 cloth, and printed using a thermal head (manufactured by Matsushita Electric Central Research Institute, long-distance printing device).

The result of printing on a rotary press using the stencil plate printed in this way is extremely sharp and faithful to the dots of the thermal head.
In addition, high quality printed matter without uneven image density was obtained.

(Effects of the Invention) As explained above, according to the method of the present invention, the heat-sensitive stencil plate material has a uniform size, shape, and distribution of porous openings, each of which can serve as an image element. can be easily produced, and by using the heat-sensitive stencil plate produced by the method of the present invention, high-quality printed matter comparable to tabletop offset printed matter can be easily obtained by a simple printing means 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.

Claims (1)

[Claims] A radiation-curable resin liquid is applied to the surface, such as a gravure roll having etched concave portions, leaving a pattern in which a large number of substantially closed shapes are closely and independently arranged, and the remaining portions are etched with a radiation-curable resin liquid. The resin liquid is removed, and the thermoplastic resin film is brought into close contact with the resin liquid present only in the recesses, and radiation is irradiated from the thermoplastic film side to cure the radiation-curable resin, and the thermoplastic resin film and radiation-curable resin are bonded together. 1. A method for producing a heat-sensitive stencil plate, which comprises adhering the thermoplastic film and the radiation-cured resin adhered to the thermoplastic film using a gravure roll or the like.