JPS61137744A - Formation of matrix for forming relief - Google Patents

Abstract

PURPOSE:To eliminate the remaining of air bubbles, by arranging a translucent part around the positive image part of a transparent image carrier. CONSTITUTION:A photosensitive resin composition is arranged on a support 2 arranged to the upper surface of a transparent image carrier 3 in a closely contacted state and active rays 6 are allowed to irradiate said resin composition 1 from the side of the transparent image carrier 3. By this method, the part corresponding to the translucent part 10 arranged around a positive image 5 is brought to a partially cured uncured part 11 and the remaining of air bubbles is eliminated, for example, when the relief image of a rubber stamp or printing plate is cast from a matrix.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing a matrix for relief images such as stamps, rubber stamps, relief plates for printing plates, etc.

(Prior art) Conventionally, as a method for creating relief images on rubber plates such as stamps, rubber stamps, and letterpress plates for printing plates, a letterpress plate made of hand-filled or letterpress or photosensitive resin is used as a prototype, and then diallyl resin, phenol, etc. Thermosetting resin such as resin, for example 150
℃, 30 Kf/cd, about 7 minutes to produce a concave mother, and unvulcanized rubber is hot pressed to it at a temperature higher than the vulcanization temperature, for example, 130 to 160 ℃, and a pressure of 30 Ky/m. A Pum version was created. However, the hand-holding method has problems with the skill level of the worker and the working time, and the casting method with a press has problems such as the process of producing an original and replicating it is long.

Therefore, as a method to eliminate these problems, a transparent support 2 is placed on a transparent image carrier 3 having one positive image (non-transparent part) 5 as shown in FIG. After placing the photosensitive resin composition 1 to be photocured, actinic light 6 is applied.
For example, ultraviolet rays are irradiated from the transparent image carrier 3111 to form a photocured portion 7 and an uncured portion 8 in the photosensitive sauce 1, and then the uncured portion 8 is removed to produce a base. After that, the uncured part of the mother mold (the part from which the uncured photosensitive resin has been removed) is filled with unvulcanized rubber, heated and pressurized,
A method of creating a relief image 9 as shown in FIG. 2 has been proposed (Japanese Patent Publication No. 59-18224).

(Problems to be Solved by the Invention) However, the method described in Japanese Patent Publication No. 59-18224 is a method in which the manufacturing process of the matrix is simplified, but the relief image to be created from this matrix ( If 9) in Fig. 2 is a thin line or small dot, the uncured part 7 in Fig. 1 will be a thin and deep recess, and the cross-sectional shape of the relief image 9 will be elongated, and the print made from such a matrix will be Relief images such as relief plates and stamps have a problem in that they are easily deformed during stamping or printing. In addition, when stacking the unvulcanized shim sheet on the mother mold and applying heat and pressure to push the unvulcanized rubber into the uncured part &, if the uncured part is a narrow and deep recess, it may be pushed in from the top surface. The unvulcanized rubber has no place for the gas to escape, and it may remain as bubbles, resulting in defects.

(Detailed means for solving the problem) As a result of various studies on the mother mold for creating reliefs in the above-mentioned situation, the inventor of the present invention has decided to add a translucent part around the positive image part of the positive film to be used. The present invention has been completed by discovering that it is possible to solve the above-mentioned problems.

That is, in the present invention, 1 m of the photosensitive resin composition is irradiated with actinic rays through a transparent image carrier having a positive image, and the non-positive image area (transparent area) of the transparent image carrier of the photosensitive resin composition layer is
In the method of selectively hardening the portion corresponding to the positive image portion, and then removing the portion (uncured portion) corresponding to the positive image portion to create a matrix for creating a relief, the area around the positive image of the transparent image carrier is This is a method for creating a matrix for creating reliefs with a semi-transparent part.

When the photosensitive resin composition used in the present invention is cured by irradiation with actinic rays, its solubility in various solvents is significantly reduced compared to before irradiation with actinic rays),
Various known photosensitive resin compositions may be mentioned. An example of such a composition is one mainly composed of a compound having an addition-polymerizable unsaturated group, to which a photopolymerization initiator is added. Also,
Both solid and liquid forms can be used.

The transparent support used in the present invention includes various plastic films, such as polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, and the like. In addition, its thickness is usually 50 to 2
It is 00μ.

An example of a method for producing a transparent image carrier in which a semi-transparent part is arranged around a positive image used in the present invention will be explained with reference to FIG. A negative film photographed by a camera (the image part is transparent, Fig. 3A), a masking film having a negative image that is 0.5 to 3.0 m1m wide and thicker than the negative 1iIiii image of the negative film (Fig. 3B), and Continuous halftones such as gray, halftone dots, and line-like turns can increase transmittance from 20 to 20.
A translucent member (FIG. 3C) with 80% transparency is prepared. Next, from the method of multiple printing in normal photoengraving,
After the negative film (4) is printed in close contact with the photographic film, the masking film (inside) and the semi-transparent part cut out are overlapped and printed on the same photographic film. A semi-transparent portion is provided to obtain a completely transparent ll1i image carrier (FIG. 3D).

In the JaD diagram, 5 is a positive image! Elephant, 10 is translucent, 4
is the transparent part. At this time, if a tint pattern is used as the translucent part, if the dots are rough, the dots will stand out on the outline of the characters, so it is necessary to print using a tint film finer than 65 lines/1 inch, or As shown in Figure 8, if you want to make the shoulder part of the relief or image gentle, use a continuous-tone transparent image carrier with low transmittance in the semi-transparent part close to the positive image, and higher transmittance as you move further away. May be used.

The actinic light used in the present invention is a known line light source such as a mercury lamp, a xenon arc lamp, an arc lamp,
Sunlight or the like can be used.

In the case of the present invention, it is preferable to use collimated active light, and the optical system (such as a limation lens) looper,
By using means such as skinning of a line light source, a point light source with a relatively small light emitting part can be used.

The cine invention method will be explained below with reference to FIGS. 4 to 7.

FIG. 4 is a schematic diagram of one embodiment of the method of the invention. In the figure, 1 is a photosensitive resin composition, 2 is a transparent support,
3 is a transparent image carrier having a transparent part 4, a positive image 5 and a translucent part 10; 6 is actinic light; 7 is a cured part of photosensitive resin composition 1; 8 and 11 are uncured parts of photosensitive resin composition 1. Show part. The photosensitive resin composition 1 is deposited on the transparent support 2 which is placed in close contact with the upper surface of the transparent image carrier 3 in a range of 0.5 to 1 (
It is arranged with a thickness of about Jul. Thereafter, the transparent image carrier side is irradiated with actinic light 6 to form cured portions 7 in the irradiated portions of the photosensitive resin composition 1, and uncured portions 8 and 11 in the unirradiated portions. Then, the uncured portion 8.11 is washed away to produce a relief mold. In addition, in FIG. 4, the transparent image carrier 3
Although the case has been described in which the transparent support 2 is used, the transparent image carrier itself on which the positive image 5 and the semi-transparent part 10 are printed is used as the support, and the positive image 5 and the semi-transparent part 10 are printed on the transparent support 2. When the transparent image carrier is omitted, and when the adhesive force between the transparent support 2 and the photosensitive resin composition 1 is weak, an adhesive layer can be provided as necessary. FIG. 5 shows a relief manufactured using the relief-forming mother mold prepared according to FIG. 4.

It can also be carried out by a method of overlapping a transparent image carrier 3 having only a positive image and a masking film having a semi-transparent part as shown in FIG. In order to improve the adhesion of the composition, it can be carried out by the method shown in FIG. 7 using a glass plate 12, an adhesion film 13, and a sponge tape 15. In particular, vacuum suction is applied between the adhesion film 13 and the glass plate 12. You can improve the adhesion by doing this.

Furthermore, when the photosensitive resin composition is in a solid state, the transparent support 2 is not necessarily required during irradiation with actinic rays, and the transparent image carrier 3 is layered on the photosensitive resin composition formed into a sheet. After irradiating with actinic light, the support 2
may be applied to the photosensitive resin composition and the uncured portions may be washed away.

(Effect) In the present invention, since the transparent image carrier 3 has a semi-transparent part 10 disposed around the positive image 5, the part of the transparent image carrier corresponding to the positive image 5 is completely uncured, but A portion corresponding to the transparent portion 10 becomes an uncured portion 11 that is partially cured. Due to the presence of this uncured portion 11, when a relief image of a rubber stamp, printing plate, etc. is cast from the master mold prepared by the method of the present invention, a good relief image without remaining bubbles can be obtained. Furthermore, the uncured part 11 is the fifth
A relief image having a preferable shape as shown in FIGS. 8 and 8 can be obtained.

The matrix of the present invention can also be used as a matrix for stamps, rubber stamps, printing relief plates, and other relief images, such as ornaments, three-dimensional maps, advertising displays, and the like.

(Example) Hereinafter, the present invention will be explained in detail with reference to Examples.

Embodiment 47 As shown in the figure, a positive double image of the address and name in phototype letters on the glass plate 12 and a width of about 1 eye GC1 around the letters.
00J, 4 (A- with semi-transparent part with 19G halftone dots)
A 5-size transparent image carrier 3 and a 175-μ thick polyester film coated with a urethane adhesive that is slightly larger than the A-5 size are arranged as the transparent support 2. Next, I covered it with a 100μ thick polyester film and squeezed it well from above to drive out the remaining air and make it adhere well, then I cut out an A-5 size piece and made it into a window (14).
And so. Furthermore, a sponge 15 with a thickness of about 3 m is placed around it to form a dam, and unsaturated polyester photosensitive resin is poured into it to a thickness of about 2 g, taking care not to introduce air bubbles. illuminance 3 m W/a
d, irradiate for 100 seconds.

The uncured resin in the light irradiation layer is washed away with an aqueous solution of 1% sodium borate and 0.5% surfactant.

Then, after washing with water and drying at 70°C for 10 minutes,
Furthermore, the mold was re-exposed to an ultraviolet storage lamp for 10 minutes to prepare a matrix. .

The thickness of the hardened part 7 of this mother mold is about 1.51F11,
The depth of the uncured portion 11 was 0.711 m. That is, the difference between uncured parts 8 and 11 was 0.8 silk.

An unvulcanized natural rubber was superimposed on the matrix created in this way and heat pressed at 150°C, 30°C to 9/cIA, for 7 minutes, resulting in a good relief image! I was able to create a stamp.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of a conventional method for creating a mother mold for making reliefs, Figure 2 is a cross-sectional view of a relief manufactured using the mother mold manufactured in Figure 1, and Figure 3 is a diagram showing the relief used in the present invention. FIG. 4 is a schematic diagram of an embodiment of the present invention; FIG. 5 is a cross-sectional view of a relief manufactured using the relief production mold manufactured in FIG. 4; FIG. Figure 6 is a schematic diagram of another embodiment of the present invention, Figure 7 is an explanatory diagram of an embodiment of the present invention, and Figure 8 is a relief-making matrix manufactured according to yet another embodiment of the present invention. FIG. 3 is a cross-sectional view of a relief manufactured using a mold. In the figure, 1 is a photosensitive Im fat composition, 2 is a transparent support, 3 is a transparent image carrier, 4 is a transparent part of the transparent image carrier 3, 5 is a positive image of the transparent image carrier 3, 6 is actinic light, 7 8.11 is the cured part of the photosensitive resin composition 1, 8.11 is the uncured part of the photosensitive resin composition 1, 9 is the relief image rod 10 is the translucent part, 12 is the glass plate, 13 is the adhesive tape, and 14 is the adhesive A cut portion 15 provided on the tape 13 indicates a sponge tape. Patent applicant: Asahi Kasei Kogyo Co., Ltd. Figure 1 Figure 2 Figure 4 Figure 5 n O, -1 dimension

Claims (1)

[Claims] The photosensitive resin composition layer is irradiated with actinic rays through a transparent image carrier having a positive image area to selectively harden the portion of the composition layer corresponding to the transparent area of the transparent image carrier, and then the positive image area is cured. A method for creating a relief mold by removing a portion (uncured portion) corresponding to the transparent image carrier, wherein a semi-transparent part is arranged around a positive image of the transparent image carrier. How to create