JPS63212939A - Method for forming negative for photomechanical process - Google Patents

Abstract

PURPOSE:To easily form a negative for photomechanical process by coating a one-time pressure sensitive transfer type ink layer having non-transmissivity of light on a transparent substrate to constitute an original plate and superposing a receptive sheet thereon to transfer the ink layer selectively to the receptive sheet. CONSTITUTION:The original plate 1 is constituted by coating the one-time pressure sensitive transfer type ink layer 3 having the non-transmissivity of light on the transparent substrate 2. The receptive sheet 4 is superposed on such ink layer 3. The printing pressure of a printing body 5 of a typewriter, etc., is applied to the sheet 4 from the rear face thereof. The printing image 6 of the ink layer 3 in the printing part is thereby detached from the substrate 2 and is transferred to the sheet 4. The light transmissivity is thereby provided to the plate 1 only in the detached part 61 of the image 6 and the negative 7 for photomechanical process is thus obtd. The surface of a plate material coated with a photosetting resin is exposed by using such negative 7, by which a letterpress original plate is obtd. Since the original plate is constituted by coating the ink layer on the transparent substrate, the negative for photomechanical process is easily formed simply by typing such original plate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel method for producing negatives for photolithography. More specifically, the present invention relates to a method for producing a negative for photolithography that can be suitably adopted for making letterpress plates by photolithography.

[Question 8 to be solved by the prior art/invention] Conventionally, in photoengraving, a clear-printed manuscript is prepared in advance as a master plate, and this is then photographed to create a negative film for photoengraving. There is.

The resulting negative is placed on a plate surface coated with a photocurable resin on the upper surface, an image is created on the plate surface by exposure, and then the uncured portion of the photocurable resin other than the image is washed with water and removed. By doing this, you can change the photopress.

However, in such photoengraving, the creation of a photographic negative requires the steps of first creating a clear copy of the original and then photographing this, making the operation complicated and requiring special techniques and techniques for photographing. Skill is required;
Another problem is that the plate making itself is expensive.

In view of the above-mentioned circumstances, the present invention aims to directly create a negative for photolithography using an image forming device such as a typewriter or printer, thereby eliminating all the troublesome conventional processes. purpose.

[Means for Solving the Problems] In order to achieve this object, the present invention provides an original plate having a one-time pressure-sensitive transferable ink layer that is opaque to light on one side of a transparent substrate. The one-time pressure-sensitive transferable ink layer is selectively transferred from the transparent substrate to the receiving sheet using an image forming device, and the original plate is superimposed on the receiving sheet such that the layer faces the receiving sheet. This system employs a configuration that forms a negative image.

[Action/Effect of the Invention] By doing this, it is now possible to create a negative using only the process that corresponds to the conventional process of creating a clean manuscript using a typewriter or printer, and it is possible to create a negative using photolithography technology. Among the steps involved in this process, there is no longer any need for photographing or developing negatives, making it extremely easy to scan printing plates.

[Example] The present invention will be described in detail below using the drawings.

Figure 1 (ω~(b) is a schematic cross-sectional explanatory diagram showing the method of the present invention, and Figure 2 (ω~mountain) is a schematic cross-section diagram showing a plate-making method for a letterpress original using a negative obtained by the method of the present invention. The explanatory drawings and FIGS. 3 to 5 are schematic cross-sectional explanatory views showing other embodiments of the present invention, respectively.

In FIG. 1 (ω~+b+), (1) is an original plate, and the original plate (1) is coated with a pressure-sensitive transfer ink layer (3) on one side of a transparent base material ('2J). (4 ) is a receiving sheet, which is placed on the original (1) so as to face the pressure-sensitive transferable ink layer (3).

As shown in FIG. 1(b), by printing the original plate (1) with the printing body (5) from the back side of the receiving sheet (4), the ink layer of the printed area becomes a printed image ( 6)
A negative for photolithography ('7) is detached from the transparent substrate (a) and transferred onto the receiving sheet (4), and only the part (61) from which the printed image (6) is detached becomes light-transparent. I can be hatched.

The thus obtained negative (7) has a plate material (9) whose upper surface is coated with a photocurable resin layer (8) in the same manner as in ordinary photolithography, as shown in Fig. 2 (ω). placed in
The area (at) is illuminated by the light [indicated by arrow (5)] that is transmitted through the light-transmitting area (61) by projecting light from above the negative (7).
Only the portion (81) corresponding to is photocured. Next, by washing the plate material (9) with water to remove the uncured portion of the photocurable resin layer (8), the desired letterpress original plate (goods) as shown in Fig. 2) can be removed. can.

The method of the present invention does not require the labor and skill of preparing a pre-cleared original and photographing it as in normal photoengraving, and simply type-prints the original plate (1) to create the desired negative ( 7), it has the excellent advantage of being extremely easy to work with and can be done at low cost.
is suitable for use in creating letterpress originals, no different from negatives obtained by photography.

As the original plate (1) in the present invention, a pressure-sensitive type original plate is used from the viewpoint of its handling. Such an original plate is placed on a light-transmitting transparent substrate (2) such as a polypropylene film or a polyester film with a thickness of 3 to 200 μm.
A pressure-sensitive transferable ink composition consisting of wax, oily substance, coloring material (dye, pigment), and binder substance if necessary is kneaded and applied to hot melt coating, or dissolved or dispersed in an organic solvent to form solvent coating. It has a pressure-sensitive transferable ink layer (3) with a thickness of 0.5 to 30 microns.

The pressure-sensitive type original plate (1) is prepared by peeling the pressure-sensitive transferable ink layer (3) from the transparent substrate (2) by printing pressure (impact pressure) using a normal typewriter, etc., and applying it onto the receiving sheet (4). Transfer.

In the present invention, in order to improve the releasability of the pressure-sensitive transfer ink layer (3), for example, as shown in FIG. 0.0
A release layer 01) made of silicone resin with a thickness of about 1 to 5 μm may be interposed.

The ink composition forming the pressure-sensitive transferable ink layer can be the same ink composition used for ordinary pressure-sensitive transferable media, but if the ink layer (3) to be distinguished is If opacity is required and the light opacity is poor, the resulting negative (7) can be used as a printing plate (9).
When placed on top and exposed to light, the photocurable resin layer (8
) is used to harden parts other than the desired hardened part (81), making it impossible to produce a fully satisfactory letterpress original plate. Therefore, in the present invention, between the transparent substrate (2) and the pressure-sensitive transfer ink layer (3), or as shown in FIG. ), aluminum, zinc,
A metal vapor deposited layer (12) of copper or the like having a thickness of 0.01 to 1 μm may be provided, and such metal vapor deposited layer (02) is transferred to the receiving sheet (4) together with the pressure-sensitive transferable ink layer (3) during printing. It will be done.

Further, the use of the receiving sheet (4) is not particularly limited as long as it can reliably receive the ink layer peeled off from the transparent base material (2). Films such as vinylon, polyester, cellophane, polypropylene, and polyethylene are preferably employed.

Further, in plate-making operations, there are cases in which the coating strength of the original plate is required. In this case, the strength of the coating film can be increased by increasing the amount of binder added to the pressure-sensitive transfer ink, but if the strength of the coating film becomes too strong, the transparent base material of the pressure-sensitive transfer ink There is a risk that the removability of the film will become poor and it will not be possible to return clear negatives.

Therefore, as shown in FIG.
A pressure-sensitive adhesive layer having relatively weak adhesiveness under normal conditions may be provided on 1) so that the ink can be peeled off from the transparent substrate by applying printing pressure.

In the pressure-sensitive transferable ink layer (3), dark pigments such as carbon black, iron oxide, graphite, and dyes such as oil black and nigrosine are appropriately used as light shielding agents, and titanium oxide, magnesium carbonate, and zinc are also used. flower,
Pigments with a relatively high refractive index, such as aluminum sulfate, can also be used auxiliary.

Next, the present invention will be explained in detail with reference to Examples.

Example 1 20 parts of carnauba wax (parts by weight, the same applies hereinafter), 30 parts of paraffin wax 145@F, 50 parts of lubricating oil (Vitoria Oil 1I22) manufactured by Shell Chemical Co., Ltd., pigment manufactured by Columbia Ribbon & φ Carbon Co. (Turben 12
55) An ink composition obtained by kneading 20 parts of Orient Kagaku ■ dye and 2 parts of Glossine Base HE) was hot-melt coated on a 100μ thick transparent polypropylene film to produce a 6μ thick pressure-sensitive transfer film. Added an ink layer.

A thin paper of log/nf was superimposed on the surface of the ink layer, type printing was performed from the back side of the thin paper, and the thin paper was peeled off to obtain a negative film for photolithography.

Example 2 10 parts of carnauba wax, 15 parts of silicone oil KP-96 manufactured by Shin-Etsu Silicone ■, Turben 1255 (
(mentioned above), 2 parts of dye (Oil Black No. 5) manufactured by Orient Chemical Co., Ltd., and 100 parts of toluene were uniformly mixed to obtain an ink composition.

Silicone resin 11M (product name: KS-709 manufactured by Shin-Etsu Silicone ■) was placed on a transparent polyester film with a thickness of 100μ.
) was applied to form a release layer having a thickness of 0.1μ, the ink composition was applied onto the release layer, and the solvent was dried to obtain a pressure-sensitive transferable ink layer having a thickness of 5μ. 1 on the ink layer
Thin paper weighing 0 g/g was superimposed, type printing was performed from the back side of the tissue paper, and the tissue paper was peeled off to obtain a negative film.

Example 3 5 parts of carnauba wax No. 1, 5 parts of refined rapeseed oil, polyvinyl butyral (Nislex B manufactured by Block Chemical Industry ■)
An ink composition was obtained by uniformly mixing 3 parts of MS), 51 parts of dye (Carbon Black Mist 40) manufactured by Mitsubishi Chemical Corporation, 1 part of dye (Oil Black No. 5) manufactured by Orient Chemical Company 2, and 100 parts of toluene. This thing has a thickness of 10
It was coated on a 0μ transparent polyester film and dried to obtain a 6μ thick pressure-sensitive transferable ink layer.

On the other hand, as a receiving sheet, polybutene +1 V 300 manufactured by Nippon Petrochemical Co., Ltd. was placed on a 9μ thick polyester film.
A pressure-sensitive adhesive layer with a thickness of 1 μm was formed by hot-melt coating a pressure-sensitive adhesive consisting of 15 parts of paraffin wax 145 "l", 70 parts of YS Resin A300 manufactured by Yasushi Kogyo Oki Co., Ltd. I used the one that I made. The pressure-sensitive adhesive layer and the pressure-sensitive transferable ink layer were stacked and type-printed so as to face each other, and the receiving sheet was peeled off to obtain a negative film.

Example 4 A release layer made of silicone resin was formed on a transparent polyester film with a thickness of 100μ in the same manner as in Example 2, and then a metal vapor deposited layer of aluminum (
Then, the same ink composition as obtained in Example 1 was hot-melt coated on the metal vapor deposited layer to obtain a pressure sensitive transferable ink layer. 10 on the ink layer side
G/RTF tissue paper is overlaid and type printed,
I tore off the tissue paper and got the negative film.

Each of the negative films obtained in Examples 1 to 4 was superimposed on a photocurable plate-making resin plate (trade name: rAPRJ, manufactured by Asahi Kasei Industries, Ltd.), exposed to light in the same manner as in ordinary photo-engraving, and washed with water to form a letterpress printing original plate. I got it.

[Brief explanation of the drawing]

FIG. 1 (ω ~ city is a schematic cross-sectional explanatory diagram showing the method of the present invention,
2(a) to 2) are schematic cross-sectional explanatory diagrams showing a plate-making method for a letterpress original plate using a negative obtained by the method of the present invention;
3 to 5 are schematic cross-sectional explanatory views showing other embodiments of the present invention, respectively. (Main symbols in the drawings) (1): Original plate (2), transparent base material (3): Pressure-sensitive transfer ink layer (4): Receptive sheet (5): Printed body (6): Printed image (7'); Photolithographic negative (old): Release layer side: Metal vapor deposited layer n: Pressure-sensitive adhesive layer Figure 2 (a)

Claims (1)

[Scope of Claims] 1. An original plate having a light-opaque one-time pressure-sensitive transferable ink layer attached to one side of a transparent substrate is superimposed on the receiving sheet such that the ink layer faces the receiving sheet. . A method for producing a negative for photolithography, comprising selectively transferring the one-time pressure-sensitive transferable ink layer from the transparent substrate to the receiving sheet in an image forming apparatus to form a negative image on the original plate. 2. The method according to claim 1, wherein a release layer is interposed between the transparent support and the pressure-sensitive transferable ink layer. 3. The method according to claim 1 or 2, wherein a metal vapor-deposited layer is interposed between the transparent support and the pressure-sensitive transferable ink layer or between the release layer and the pressure-sensitive transferable ink layer. Method. 4. The method according to claim 1, wherein the receiving sheet is coated with a pressure-sensitive adhesive on its upper surface.