JPH0582571B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for manufacturing a photocurable resin plate material provided with an adhesive layer on the back surface of the plate material.

(Prior Art) A plate material using a photocurable resin is manufactured, for example, as follows. As shown in FIG. 4, a cover film 520, a liquid or solid photocurable resin layer 530, and a transparent base film 540 are sequentially laminated on a negative film 510. The photocurable resin is partially cured by exposure to form a relief support portion 531. Next, negative film 5
Exposure is performed from the 10 side to harden the photocurable resin region corresponding to the positive portion 511 of the negative film 510, thereby forming a relief portion 532 continuous to the relief support portion 531. The obtained photocurable resin plate material is attached to a plate cylinder roll or a plate cylinder roll plate mounting tool of a printing machine such as a rotary press, and is subjected to a printing process. In order to fix this plate material to a plate material support such as a plate cylinder roll, it is known to adhere the back surface 541 of the plate material to a plate material support (not shown) with an adhesive, or to adhere both with double-sided tape. It is being The adhesive is usually applied to the adhesive surface 541 of the plate material in a diluted state with a solvent, but the adhesive is evenly applied to the adhesive surface 541.
It is difficult to apply the solvent, and the drying state of the solvent after application tends to be uneven. Therefore, it is not possible to obtain a plate material with uniform adhesive strength. Furthermore, there is a risk that the working environment will be contaminated due to the volatilization of the solvent. On the other hand, when a double-sided tape is used to adhere a plate material to a fixing part, it is necessary to cut the double-sided tape to match the dimensions of the plate material and/or the fixing part to which it is attached. The work is precise and complicated. Double-sided tape is also relatively expensive.

(Object of the Invention) An object of the present invention is to provide a method for producing a photocurable resin plate material that can be quickly fixed to any plate support and printed. Another object of the present invention is to provide a method for producing a photocurable resin plate material that does not require skill in adhering and fixing the plate material and can be fixed to a plate material support with simple operations. Still another object of the present invention is to provide a method for producing a photocurable resin plate material that can be fixed to a plate material support at low cost without requiring special adhesive materials such as double-sided tape. Still another object of the present invention is to provide a method for producing a photocurable resin plate material that can be fixed to a plate support stand without contaminating the working environment with solvents or the like. Still another object of the present invention is to provide a method for producing a photofabricable resin plate material having the above characteristics through a simple process similar to that of conventional photocurable resin plate materials.

(Structure of the Invention) The method for producing a photofabricable resin plate material of the present invention is based on an adhesive base film in which a transparent pressure-sensitive adhesive layer or a transparent heat-sensitive adhesive layer and a transparent release sheet are sequentially provided on one side of a transparent base film. A step of laminating a photofabricable resin layer and a negative film on the other side of the transparent base film to form a laminate; a step of exposing the laminate to light from the adhesive base film side to form a relief support portion; a step of exposing the body from the negative film side and curing the photocurable resin region corresponding to the positive portion of the negative film to form a continuous relief portion on the relief support portion; and The method includes a step of removing the hardened area to obtain a plate material, thereby achieving the above object.

As shown in FIG. 1, a laminate 1 for plate material of the present invention
is an adhesive base film 11 and a photocurable resin layer 1
2 and a negative film 13.

The adhesive base film 11 is formed by providing a transparent pressure-sensitive adhesive layer or a transparent heat-sensitive adhesive layer 15 on one side of a transparent base film 14. To obtain the plate material laminate 1, for example, first, the photocurable resin layer 12 is laminated on the negative film 13. The adhesive base film 11 is laminated on the photocurable resin layer 12 so that the non-adhesive layer side 110 of the adhesive base film 11 is in contact with the adhesive base film 11 .

The transparent base film 14 has the role of reinforcing the final plate material and keeping it in a predetermined shape, and is made of, for example, acrylic resin, polyester, polyethylene, polypropylene, or the like.
Its thickness is generally 25-300 μm. This transparent base film 14 may be one piece or a plurality of pieces stacked together. Polyethylene terephthalate film with a thickness of 50-250 μm is most preferred in terms of quality and price.

Examples of pressure-sensitive adhesives constituting the transparent pressure-sensitive adhesive layer 15 include rubber-based adhesives; synthetic resin-based adhesives such as acrylic-based, urethane-based, and silicone-based adhesives. Synthetic resin adhesives, particularly acrylic adhesives, are preferred because they have solvent resistance, transparency, and the like. The transparent pressure sensitive adhesive layer 15 preferably has a thickness of 30 to 150 μm, an SP adhesive strength of 500 to 1500 g/25 mm, and a shear tensile strength of 7 to 25 Kg/25 mm. Since such an adhesive layer 15 has a large holding power, the so-called "adhesive residue phenomenon" does not occur when the plate material once adhered to the fixed portion is peeled off again.

Examples of the heat-sensitive adhesive constituting the transparent heat-sensitive adhesive layer 15 include polyester adhesives; polyamide adhesives; and vinyl acetate adhesives such as ethylene-vinyl acetate copolymer. It is convenient for processing operations that its thermal activation temperature is 80 to 200°C. Since these heat-sensitive adhesives do not change in quality due to heat or light, the surface of the adhesive layer 15 does not become sticky even when exposed to light. Polyester-based and polyamide-based adhesives have particularly excellent light transmittance and solvent resistance. Transparent heat-sensitive adhesive layer 1
5 is preferably formed to have a thickness of 10 to 100 μm.

As the photocurable resin layer 12, a known photocurable resin that undergoes a radical reaction and polymerizes and hardens upon irradiation with light is used. Examples of such photocurable resins include diazo resins, azide resins, cinnamate resins, acrylic resins, and polyamides. If the photocurable resin layer 12 is in a liquid state, air bubbles are likely to enter when it is laminated on the negative film 13, so it is desirable to remove air bubbles by vacuuming after laminating the adhesive base film 11. .

A transparent release sheet 151 for protecting the transparent heat-sensitive adhesive layer or the transparent heat-sensitive adhesive layer 15 is provided on the adhesive layer 15. This transparent release sheet 151 has excellent thermal dimensional stability and is composed of a transparent plastic film having a thickness of 5 to 50 μm, for example. In order to improve the releasability of the protective layer 151, a release layer 152 may be provided on the side that is bonded to the adhesive layer 15. As the release layer 152, a release agent commonly used for adhesive tapes and the like is used. The peeling force is preferably 200 g/50 mm or less.

An undercoat layer 16 may be provided between the transparent base film 14 and the transparent pressure-sensitive adhesive layer or the transparent heat-sensitive adhesive layer 15 in order to improve the adhesion between both layers. The undercoat layer 16 is formed, for example, by coating the transparent base film 14 with an adhesive material such as isocyanate-based or polyester-based, or by directly subjecting the transparent base film 14 to corona treatment.

Transparent base film 14 and photocurable resin layer 12
A resin adhesive layer 17 may be provided between the two layers in order to improve the adhesion between the two layers. This resin adhesive layer 17
The transparent base film 1 is also the same as the undercoat layer 16 above.
The base film 14 is formed by coating the base film 14 with an adhesive material or by directly corona-treating the base film 14. A cover film 18 made of transparent plastic may be provided between the negative film 13 and the photocurable resin layer 12. This is to protect the negative film 13. In this laminate 1, all the layers except the negative film 13 are transparent to light in the wavelength range of 300 to 400 nm necessary for curing the photofabricable resin layer 12. The light transmittance of the laminate at 360 nm is 50% or more. A transparent glass plate 10 for holding the laminate 1 can be placed at the bottom of the laminate 1.

The plate material laminate 1 is exposed to light in the following manner to form a desired plate material.

As shown in FIG. 2, the photocurable resin layer 12 of the laminate 1 is exposed to light from the adhesive layer 15 side of the adhesive base film 11. Since light is transmitted through the transparent release sheet and the transparent adhesive layer, the photocurable resin is partially cured and the relief support portion 121 is formed. Subsequently, exposure is performed from the negative film 13 side through the transparent glass plate 10. The photocurable resin region corresponding to the positive portion 131 of the negative film 13 is cured, and a relief portion 122 continuous to the relief support portion 121 is formed. The uncured area 123 of the photocurable resin is scraped off with a spatula or the like. The remaining uncured resin is then completely removed through cleaning or other means. If necessary, the plate material is re-exposed to sufficiently cure the interface from which the uncured photocurable resin has been removed, thereby increasing the relief strength. The uncured photocurable resin can be recovered and reused for manufacturing the next plate material. The plate material obtained in this way can be easily fixed to a suitable plate material support stand (not shown) by peeling off the transparent release sheet 151 and applying pressure or heat pressure bonding.

When preparing a plate material with a complex relief supporting portion having a multi-stage structure for printing on cardboard or heavy bags, a light-shielding masking film 19 is further added to the adhesive base film 11 of the laminate 1, as shown in FIG. are stacked. This light-shielding masking film 19
is a support 191 made of transparent plastic film.
Separable light shielding layers 192 and 193 are laminated thereon in a sandwich pattern. Light shielding layers 192, 193
each has a predetermined light absorption rate. Light shielding layer 19
2,193, a light transmission path 194, so that the light shielding masking film 19 has desired light shielding properties,
195 are provided. This laminate 100 for a multi-stage structural plate material is formed by masking exposure from the masking film 19 side to the light transmission paths 194, 195.
The photocurable resin area corresponding to the area is cured according to the intensity of the transmitted light, and the relief support part 124 with a multi-stage structure is formed.
125. Next, by relief exposure from the negative film 13 side, the photocurable resin region corresponding to the positive portion 131 of the negative film 13 is cured, and a relief portion 126 continuous to the relief support portion 124 is formed. This laminate 100
is then processed in the same manner as in the case of the plate material having the single-stage structure relief support part, to form a photocurable resin plate material having the multi-stage structure relief support part.

(Example) The present invention will be explained below with reference to Examples.

Example 1 (Production method of plate material having one-stage relief support part) (A) Preparation of adhesive base film: A polyester adhesive was applied to the surface of a 100 μm thick transparent polyethylene terephthalate film to a thickness of 1.5 μm, An undercoat layer was formed. On top of this, a pressure-sensitive adhesive layer made of acrylic adhesive was provided with a thickness of 40 μm. Next, a release layer made of silicone resin was formed. A protective layer made of transparent polyester with a thickness of 25 μm was laminated. Further, a polyester adhesive was applied to a thickness of 2 μm on the non-adhesive layer side of the transparent polyethylene terephthalate film to form a resin adhesive layer. Adhesive base film 11 was thus prepared.

(B) Preparation of photocurable resin plate material: As shown in FIG. 2, a negative film 13 was placed on a transparent glass plate 10 with a thickness of 5 mm. On top of this is the thickness
A cover film 18 made of a transparent removable polypropylene film of 30 μm is coated with liquid amide photosensitive resin as a photocurable resin to a thickness of 0.5 cm.
Then, the adhesive base film 11 obtained in section (A) was further laminated in sequence to obtain a laminate 1.
Exposure was performed for 5 minutes from a distance of 4 cm from the adhesive base film 11 side using a mercury lamp (output 6 kW). A part of the photocurable resin area was cured to form a relief support portion 121 . Next, a similar mercury lamp was used to illuminate the negative film 13 through the transparent glass plate 10 from a distance of 4 cm.
A minute relief exposure was performed. negative film 13
The photocurable resin region corresponding to the positive portion 131 was cured, and a relief portion 122 connected to the relief support portion 121 was formed. Next, the transparent glass plate 10, negative film 13 and cover film 18 were removed in sequence. Then, the uncured region 123 of the photocurable resin was mechanically scraped off using a spatula or the like. Furthermore, after washing with water containing a surfactant, post-exposure was performed in water. Protective layer 15 on the back of the obtained plate material
1 could be peeled off and easily adhered and fixed to a predetermined plate support portion.

Example 2 (Production method of plate material having multi-stage relief support portion) (A) Preparation of adhesive base film: Same as Example 1 (A).

(B) Preparation of light-shielding masking film: thickness
A 100 μm transparent polyester film was used as a support. The light transmittance of this support at 300 to 400 μm is 70%. Per 100 parts by weight of polymethyl methacrylate (calculated as solid content in toluene solution), as a light shielding agent, 2-
0.5 parts by weight of (2-hydroxy-5-methylphenyl)benzotriazole was added. This toluene solution was applied to both sides of the support so that the thickness after drying was 20 μm on each side to form a light-shielding layer. The light-shielding rate of the light-shielding masking film thus prepared at 300 to 400 μm was 99.5% as a whole.

(C) Preparation of photocurable resin plate material: the light-shielding layer 192 of the light-shielding masking film 19 obtained in section (B),
193 was partially cut out to provide light transmission paths 194 and 195 as shown in FIG. This is the adhesive base film 1 of the laminate 1 in Example 1.
1 to obtain a laminate 100. Using the same mercury lamp as in Example 1(B), masking exposure was performed for 5 minutes and relief exposure was performed for 5 minutes to obtain a plate material having multi-stage relief support portions 124 and 125. The protective layer 151 on the back side of the obtained plate material was peeled off and easily adhered and fixed to a predetermined plate support portion.

(Effects of the Invention) According to the present invention, a plate material having an adhesive on the back surface can be obtained with the same number of steps as in the conventional method for producing a photocurable resin plate material. The obtained plate material can be quickly adhered and fixed to a desired plate support base by a simple operation without requiring any skill as in the conventional method. It is not necessary to apply an adhesive to the plate material and/or the fixing portion to fix the plate material as in the conventional method. Therefore, there is no disadvantage that the adhesive strength of the plate material becomes uneven due to uneven coating. There is no need to wait for the solvent in the applied adhesive to dry, and the working environment is not contaminated by volatilization of the solvent. Since special adhesive materials such as double-sided tape are not required, plate materials can be attached at low cost without requiring elaborate and complicated work.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing an example of the plate material laminate 1 of the present invention, and FIGS. 2 and 3 are photocurable resins having a single-stage relief support portion and a multi-stage relief support portion of the present invention, respectively. FIG. 4 is a cross-sectional explanatory diagram illustrating an example of a method for manufacturing a plate material. FIG. 4 is an explanatory cross-sectional diagram illustrating an example of a conventional method for manufacturing a photocurable resin plate material. 1,100...Plate material laminate, 11...Adhesive base film, 12...Photocurable resin layer, 14...
...Transparent base film, 15...Transparent adhesive layer,
151...Transparent release sheet, 121,124,1
25... Relief support part, 122, 126... Relief part.

Claims (1)

[Claims] 1. An adhesive base film in which a transparent pressure-sensitive adhesive layer or a transparent heat-sensitive adhesive layer and a transparent release sheet are sequentially provided on one side of the transparent base film, and a photocurable resin is provided on the other side of the transparent base film. a step of laminating the layers and a negative film to form a laminate; a step of exposing the laminate from the adhesive base film side to form a relief supporting portion; exposing the laminate from the negative film side; a step of curing the photocurable resin region corresponding to the positive portion to form a continuous relief portion on the relief support portion; and a step of removing the uncured region of the photocurable resin to obtain a plate material. A manufacturing method for photocurable resin plate material.