JPH0543146U - Photosensitive ink sheet - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is capable of smooth movement and smooth fixation to a transfer machine when the sheet is bent or curled when it is moved to an exposure machine or a heat transfer machine. This is to improve what could not be done, and to form holes with high precision by punching, thereby reducing the deviation of the final image examination. [Structure] A photosensitive ink sheet having a structure in which an ink protective layer 5 composed of a transparent polyester sheet 1, an ultraviolet ray-curable ink layer 2, a polyethylene sheet 3, and a polyester sheet 4 having a size of 3.5 to 15 microns is sequentially laminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a material for forming an image by superimposing a single color or multiple colors, and a material used for simple proof printing.

[0002]

[Prior Art]

 As an image forming method for proof printing using a photosensitive material, an overlay method, a surprint method, etc. have been conventionally known. The overlay method is disclosed in U.S. Pat. No. 3,136,637, in which a photosensitive coloring sheet exposed in close contact with a color-decomposed negative film is developed for each color and sequentially superposed, and a color proof image is obtained. Is what you get.

The surprint method is disclosed in US Pat. No. 3,671,236, in which several colored layers are superposed on a single support, and for this purpose, the color of an image to be formed is adjusted. Various toners are laminated on one common sheet, or a photosensitive layer of a color corresponding to an image is sequentially laminated on a support.

An image forming method applying a photopolymerization and heat transfer technique is also known. In US Pat. No. 3060023, a photopolymerizable layer on a support is described as a color separation negative film. A method is described in which the layers are brought into intimate contact with each other, exposed, and then the surface of the exposed layer is pressed against an image receptor to heat the unexposed portion to a temperature higher than the melting temperature and transfer the unexposed portion to the receptor.

These conventional methods are very convenient because they can easily obtain an image for proofreading similar to a printed matter, but they are too different in texture from the printed matter or the orientation of the finally obtained image. However, there is a problem in that it is in the opposite direction to the printed matter, or the development process using an alkaline substance is involved, and a method of forming an image that is closer to the printed matter and does not involve waste liquid treatment is desired. Was there.

As such a method, a photosensitive layer containing a dye or a pigment is provided on a support, image exposure is carried out using a positive or negative film, and the tackiness of exposed and unexposed areas of the photosensitive layer is controlled. A method has been proposed in which an image is heated and transferred to a receptor such as paper, which causes a difference. As for the structure of the sheet for this purpose, since the substrate is exposed to light, a transparent polyester sheet 1 of 3.5 to 15 μm is used as a photosensitive layer to protect the ultraviolet-curable ink layer 2 and the ink layer, and to remove polyethylene afterwards. A light-sensitive ink sheet 10 in which the sheets 3 are sequentially laminated is used.

However, this photosensitive ink sheet requires registration during image exposure and heat transfer. To match this registration, the photosensitive ink sheet has a hole-punching process to align the registration. However, since the support of the photosensitive ink sheet is thin polyester and the layer that protects the ink layer and is easily peeled off from the ink later is a soft polyethylene sheet, punching cannot be performed accurately or punching is performed. There was a problem that the holes were too soft, and the sheets moved due to the applied force when the photosensitive ink sheet was attached, which caused misregistration of the finally obtained image.

When exposing the image and moving the photosensitive ink sheet to the heat transfer machine, the photosensitive ink sheet has a large area such as A1 (594 × 841 mm) or A2 (420 × 594 mm). Therefore, if it is not soft enough, it is not suitable for contact exposure, and it cannot be spread on the plate cylinder for heat transfer, but if it is too soft, the sheet moves to the exposure machine or heat transfer machine. There was a problem that it was bent or curled when moving, and it could not be moved smoothly or fixed to the machine, resulting in poor workability. In order to avoid such softness, the surface of thick polyester was treated to facilitate peeling, and the workability was improved, but the degree of peeling was too light and the sheet was exposed to the exposure machine. When the paper was moved or moved to the heat transfer machine, it might peel off spontaneously, or even if the sheets were stacked and placed, the ink surface could be misaligned. In addition, the peeling agent sometimes migrated from the peeled surface to the ink surface, causing deterioration of the ink surface.

[0009]

[Problems to be solved by the device]

 The present invention improves on the fact that when the sheet is moved to the exposure machine or the thermal transfer machine, the sheet is bent or curled, and smooth movement and smooth fixing to the machine cannot be performed. In addition, punching is used to form holes with high precision, thereby reducing misregistration of the final image. In addition, we will try to utilize the appropriate adhesiveness and peelability of polyethylene with the ink surface.

[0010]

[Means for Solving the Problems]

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

The ultraviolet curable ink layer 2 is composed of a thermoplastic resin having no photopolymerization property, a monomer or a prepolymer, a photopolymerization initiator, a pigment, a dye and the like. The film thickness of the ink layer is 0.5 to 5 μm. The ink protective layer 5 consisting of the polyethylene sheet 3 and the polyester sheet 4 is for protecting the ink, and is also handled by moving or mounting the light-sensitive ink coating sheet 10 during exposure or heat transfer. It is a temporary support for good workability and ease, and is made of soft polyethylene, which is easy to peel off before heat transfer, on the ink side. In addition, it is a material with polyester having an appropriate hardness as the outside. Polyethylene and polyester are bonded together with an adhesive. This polyethylene has an appropriate adhesiveness to the ink surface, and has a force that does not cause spontaneous peeling when the photosensitive ink sheet 10 moves. Also, when peeling, it does not show strong adhesiveness such as peeling the ink from the polyester surface. In addition, the peeling agent does not migrate from the surface to the ink surface and does not deteriorate the ink surface.

The ink sheet of the present invention is used as follows. A hole is punched in one end of the photosensitive ink sheet 10 with a punching machine. The surface of the transparent polyester sheet 1 having a size of 3.5 to 15 μm is brought into contact with the color-separated positive film, the photosensitive ink sheet 10 is brought into close contact therewith, and the punching holes 6 are fixed to expose the light.

The exposed photosensitive ink sheet 10 was positioned and fixed by the pins 8 of the heat transfer machine 11, and the ink protection layer 5 composed of the polyethylene sheet 3 and the polyester sheet 4 was peeled off 12. Transfer to the paper 13 and remove the photosensitive ink sheet 12 transferred by the unexposed portion of the ink. The entire surface of the paper 13 on which the ink was transferred was exposed by an ultraviolet lamp 14 to cure the ink on the paper surface. The photosensitive ink sheet 10 of the next color is exposed again by the same operation using the separated positive film of another color.

[0014]

[Effect of the device]

 By adopting the configuration of the present invention, the trouble of bending or curling when the sheet is moved to the exposure machine or the heat transfer machine is eliminated, and the sheet can be smoothly moved and smoothly fixed to the machine. It became so. In addition, punching creates holes with high precision, which reduces the misalignment of the final image. In addition, the appropriate adhesiveness and peelability of polyethylene with respect to the ink surface can be utilized, and problems such as migration of the peeling agent to the ink surface and natural peeling of the protective sheet have been eliminated. Even when the colors were sequentially superimposed, the registration accuracy was good, and an image with a resolution and color reproducibility that was very similar to printed matter could be formed as an image for proofreading.

[0015]

[Brief description of drawings]

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

[0016]

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

[0017]

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

[0018]

[Explanation of symbols]

 1 Transparent polyester sheet of 3.5 to 10 microns 2 UV curable ink layer 3 Polyethylene sheet 4 Polyester sheet 5 Ink protective layer 6 Punching hole 8 Pin 10 Photosensitive ink sheet 11 Heat transfer machine 12 5 was peeled from 10 exposed Things 13 Paper 14 UV lamp

Claims (1)

[Scope of utility model registration request] 1. An ink protection layer 5 comprising a transparent polyester sheet of 3.5 to 15 microns, an ultraviolet curable ink layer 2, a polyethylene sheet 3 and a polyester sheet 4.
A photosensitive ink sheet having a structure in which layers are sequentially laminated.