Multi-color image formining material and multi-color image forming method

Abstract

To provide a multicolor image forming material in which upon irradiation with laser beam, a laser beam irradiated region of an image forming layer is transferred onto an image receiving layer of an image receiving sheet to undergo multicolor image recording, wherein the multicolor image forming material is (a) a multicolor image forming material wherein a ratio of an optical density (OD) to a film thickness of the image forming layer of each thermal transfer sheet is 1.50 or more, a recording area of a multicolor image of each thermal transfer sheet is of a size of 515 mm x 728 mm or more, a resolution of the transferred image onto the image receiving layer of the image receiving sheet is 2,400 dpi or more, a rate of heat shrinkage in the machine direction and a rate of heat shrinkage in the transverse direction of the image receiving sheet are both not more than 1 %, and the rate of heat shrinkage in the transverse direction of the image receiving sheet is smaller than the rate of heat shrinkage in the machine direction thereof, (b) a multicolor image forming material wherein after laser thermal transfer, a coefficient of dynamic friction between the thermal transfer sheet surface and the image receiving sheet surface is not more than 0.70, (c) a multicolor image forming material wherein a stiffness in the machine direction (Msh) and a stiffness in the transverse direction (Tsh) of the thermal transfer sheet are both from 30 to 70 g, a stiffness in the machine direction (Msr) and a stiffness in the transverse direction (Tsr) of the image receiving sheet are both from 40 to 90 g, Msh / Tsh and Msr / Tsr are each from 0.75 to 1.20, and 10 g ≤ (Msr - Msh) ≤ 40 g and 10 g ≤ (Tsr - Tsh) ≤ 40 g, or (d) a multicolor image forming material wherein at least the magenta thermal transfer sheet has a breaking stress of from 150 to 300 MPa in both the machine direction (MD) and the crosswise direction (CD), with the breaking stress in the crosswise direction (CD) being at least 10 MPa larger than that in the machine direction (MD) and a breaking elongation of from 80 to 300 % in both the machine direction (MD) and the crosswise direction (CD), with the breaking elongation in the machine direction (MD) being at least 5 % larger than that in the crosswise direction (CD); and a multicolor image forming method using these multicolor image forming materials.

Description

technical field [0001] The present invention relates to a multicolor image forming material for forming a high-resolution full-color image using laser beams and a multicolor image forming method using the same. Specifically, the present invention relates to a multicolor image forming material and a color image forming method for preparing color proofs in the printing field (DDCP: Direct Digital Color Proofing) by laser recording from digital image signals. Background technique [0002] In the field of graphic arts, printing on printing plates is carried out using a set of color separation films prepared using lithographic printing films from a color original. In general, a color proof is prepared from a color separation film in order to check errors in a color separation step or the need for color correction, etc., before conventional printing (actual printing work). Color proofing is expected to achieve high resolving power that can achieve high reproducibility of halftone...

AI Technical Summary

Problems solved by technology

[0010] In addition, problems such as insufficient registration accuracy and easy wrinkling during actual paper stock transfer were encountered

[0011] In addition, there are cases causing inconvenience that, after transferring images from various thermal transfer papers to image-receiving paper in a tray or the like, images with transferred images are piled up on the printed thermal transfer paper due to lamination When receiving paper, the iron-on transfer paper falls from the tray, or the image receiver paper is curled

[0012] In addition, such a problem is encountered that when a large size is produced, the transferability of thermal transfer paper or image-receiving paper becomes difficult, or jamming or other troubles occur

[0013] Moreover, such problems are encountered as the image quality is degraded by scratching the cutting surface due to the cutting failure of the thermal transfer paper or impurities such as pollutants generated during the cutting process.

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