JP2533056Y2 - Photosensitive ink sheet - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material for forming an image by superimposing a single color or multiple colors, and to a material used for simple proof printing.

[0002]

2. Description of the Related Art As an image forming method for proof printing using a photosensitive material, an overlay method, a surprint method, and the like are conventionally known. The overlay method is disclosed in U.S. Pat. No. 3,136,637, in which a photosensitive colored sheet, which is exposed in close contact with a color-separated negative film, is developed in each color and sequentially superimposed to obtain an image for color proofing. What you get.

The surprint method is disclosed in US Pat. No. 3,671,712.
No. 36 discloses a method in which several colored layers are superimposed on a single support. For this purpose, various toners according to the color of an image to be formed are applied to one common sheet. Laminating, or laminating a photosensitive layer of a color corresponding to an image on a support in order.

[0004] Also, a method of forming an image to which a technique of photopolymerization and heat transfer is applied is known, and US Pat.
In JP-A No. 23 and other publications, the photopolymerizable layer on the support is exposed by contacting a color separation film with a color separation negative film. A method is described in which the unexposed portions are transferred to a receptor by heating.

[0005] These conventional methods are very convenient because a calibration image similar to a printed matter can be easily obtained, but are very different from the printed matter or the orientation of the finally obtained image. However, there is a problem in that it is opposite to the printed matter, or that a development process using an alkaline substance or the like is involved, and a method of forming an image that is closer to the printed matter and does not involve waste liquid treatment has been desired. .

As such a method, a photosensitive layer containing a dye or a pigment is provided on a support, and image exposure is performed using a positive or negative film. A method has been proposed in which a difference is generated and an image is transferred to a receptor such as paper by heating. The structure of the sheet for this purpose is as follows.
The 15-micron transparent polyester sheet 1 is protected as a photosensitive layer with the ultraviolet-curable ink layer 2 and the ink layer,
A photosensitive ink sheet 10 in which polyethylene sheets 3 to be peeled later are sequentially laminated is used.

However, this photosensitive ink sheet requires registration during image exposure and heat transfer. In order to adjust the register, the photosensitive ink sheet has a punching process for punching the register. However, in the photosensitive ink sheet, the support is made of a thin polyester, the ink layer is protected, and the layer which is easily peeled off from the ink later is a soft polyethylene sheet. The holes are too soft and the sheet moves due to the force applied when mounting the photosensitive ink sheet.
As a result, there is a problem that the misregistration of the finally obtained image is likely to occur.

When exposing an image and moving the photosensitive ink sheet to a heat transfer machine, the photosensitive ink sheet
1 (594 × 841 mm) or A2 (420 × 59
4mm), it is a sheet with a large area, so it is not suitable for contact exposure unless it is moderately soft.
Heat transfer cannot be spread on the plate cylinder, but if it is too soft, it can bend or curl when the sheet moves to the exposure machine or to the heat transfer machine, and can move smoothly and be fixed to the machine. There was a problem that workability was poor. In order to avoid such softness, the surface of the thick polyester was treated to make it easy to peel, and the work efficiency was improved. However, the degree of peeling was too light, and the sheet was exposed to a sheet exposure machine. When the sheet is moved or moved to a heat transfer machine, the sheet may be spontaneously peeled off, or a deviation from the ink surface may occur even when sheets are stacked and placed. In addition, the release agent may transfer to the ink surface from the surface subjected to the release treatment, and may deteriorate the ink surface. Further, in the exposure of an image, particularly in a highlight portion, there is a disadvantage that the image cannot be sufficiently reproduced due to the influence of light halation.

[Problems to be solved by the invention]

[0009] The present invention is an improvement in that the sheet is bent or curled when the sheet is moved to the exposing machine or the heat transfer machine, and the sheet cannot be smoothly moved or smoothly fixed to the machine. In addition, an accurate hole is formed by punching, thereby reducing the misregistration of the final image. It also seeks to take advantage of the moderate adhesion and release properties of polyethylene to the ink surface. Further, it is intended to eliminate the influence of halation and reproduce an image with good resolution.

[Means for Solving the Problems]

The present invention has a structure in which a transparent polyester sheet of 3.5 to 15 microns, an ultraviolet curable ink layer 2, a polyethylene sheet 3, an antihalation layer 4, and an ink protective layer 6 composed of a polyester sheet 5 are sequentially laminated. The present invention relates to a photosensitive ink sheet. 3.5 in the present invention
As the transparent polyester sheet 1 having a size of ミ ク ロ ン 15 μm, a thin sheet which is transparent and has little scattering of light is used because it becomes an exposed surface of an image. When the sheet is thick, the resolution of the image is reduced due to the scattering of light due to the film thickness.

The ultraviolet-curable ink layer 2 is made of a thermoplastic resin having no photopolymerizability, a monomer or a prepolymer, a photopolymerization initiator, a pigment, a dye, and the like. The thickness of the ink layer is 0.5 to 5 μm. An ink protective layer 6 composed of a polyethylene sheet 3, an antihalation layer 4 and a polyester sheet 5 is for protecting the ink, and is used for moving or attaching the photosensitive ink sheet 10 during exposure or heat transfer. It is a temporary support for easy handling with good workability.
Soft polyethylene, which is easy to peel off before heat transfer, is used as the ink surface side. In addition, it is a material having a polyester having an appropriate hardness as an outer side. Polyethylene and polyester are bonded together via an adhesive or the like. This polyethylene has an appropriate adhesiveness to the ink surface, and has such a force that the photosensitive ink sheet 10 does not peel off naturally when it moves. Further, upon peeling, it does not show strong adhesiveness that peels the ink from the polyester surface. In addition, there is no possibility that the releasable chemical is transferred from the surface to the ink surface to deteriorate the ink surface. The antihalation layer 4 can be provided on the outer surface of the polyester sheet 5, but it is preferable to disperse the antihalation component in an adhesive for bonding the polyethylene sheet 3 and the polyester sheet 5 together. Examples of the antihalation agent include iron oxide and titanium oxide that cut off ultraviolet rays, and carbon black that cuts off visible light. Other pigments and dyes can also be used.

The ink sheet of the present invention is used as follows. A hole is made in one end of the photosensitive ink sheet 10 with a punching machine. 3.5-3.5 on the color-separated positive film
The photosensitive ink sheet 10 is brought into close contact with the surface of the transparent polyester sheet 1 having a size of 15 μm, and fixed with the punching holes 7 for exposure.

The exposed photosensitive ink sheet 10 was positioned and fixed by the pins 8 of the heat transfer machine 11, and the ink protective layer 6 composed of the polyethylene sheet 3, the antihalation layer 4 and the polyester sheet 5 was peeled off. Paper 13
Then, the photosensitive ink sheet 12 to which the unexposed portions of the ink have been transferred is removed. The entire surface of the paper 13 to which the ink was transferred was exposed by an ultraviolet lamp 14, and the ink was cured on the paper surface. Again, exposure of the photosensitive ink sheet 10 of the next color is performed by the same operation using the separation positive film of another color.

[0014]

[Effect of the Invention] By adopting the structure of the present invention, when the sheet is moved to the exposure machine or the heat transfer machine, the trouble of bending or curling is eliminated, so that the sheet can be smoothly moved and the machine can be easily moved. Smooth fixing is now possible. In addition, holes with high precision were formed by punching, thereby reducing misregistration of the final image. In addition, the proper adhesiveness and releasability of polyethylene with the ink surface can be utilized, and problems such as transfer of the release agent to the ink surface and spontaneous peeling of the protective sheet have been eliminated. Even when the colors were successively superimposed, registration accuracy was good, and an image similar to a printed matter with good resolution and color reproducibility was formed as a calibration image because the halation prevention layer was formed.

[0015]

[Brief description of the drawings]

FIG. 1 is a plan view after punching a photosensitive ink sheet according to the present invention.

FIG. 2 is a cross-sectional view showing the state of lamination of the photosensitive ink sheets according to the present invention.

FIG. 3 is a schematic view showing an example of the use of the photosensitive ink sheet according to the present invention.

[0016]

[Explanation of symbols]

 Reference Signs List 1 3.5 to 10 micron transparent polyester sheet 2 UV curable ink layer 3 Polyethylene sheet 4 Antihalation layer 5 Polyester sheet 6 Ink protective layer 7 Punching hole 8 Pin 10 Photosensitive ink sheet 11 Heat transfer machine 12 From exposed 10 6 peeled 13 paper 14 UV lamp

 ────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-3-96952 (JP, A) JP-A-3-129354 (JP, A) JP-A-51-5101 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A transparent polyester sheet of 3.5 to 15 microns, an ultraviolet curable ink layer, a polyethylene sheet, an antihalation layer, and a polyester sheet.
A photosensitive ink sheet having a structure in which an ink protective layer 6 made of