Kimoto Co, Ltd.

Junichi Nouda

Toshimichi Katsuoka

Hironori Sato

Yoshihisa Kimura

Toshihiro Koike

Masamitsu Miyabe

There is disclosed a direct drawing type lithographic printing plate material comprising a support and an image-forming layer formed on the support, wherein the image-forming layer is formed on a roughened surface of the support and contains a binder and a pigment having a relatively small particle size. The direct drawing type lithographic printing plate material of the present invention has extremely excellent water retention property and is capable of suppressing scumming upon printing, degradation of printing density and image blur even when the amount of a humidifying solution to be supplied is increased upon printing, and minimizes printing defects which otherwise occurs when a printing operation once stopped is resumed or the like.

Direct drawing lithographic printing plate material

There is provided a hot-melt transfer ink image-receiving sheet which is excellent in abrasion resistance as well as image density and halftone dot reproducibility of a recorded image and useful as a contact printing film in the photomechanical process. In this hot-melt transfer ink image-receiving sheet having an image-receiving surface on a support , the image-receiving surface has surface roughness (JIS-B0601) of 0.15-0.60 &mgr;m in terms of arithmetic mean deviation Ra and 1.0-3.0 &mgr;m in terms of 10-point height of irregularities Rz.

Hot-melt transfer ink image-receiving sheet

There is provided a lithographic plate material with which a lithographic plate is prepared by the hot-melt transfer recording method utilizing an ink ribbon. The lithographic plate material has an image-receptive layer for hot-melt transfer recording that has a water retention property or can be imparted with a water retention property on a support, and the image-receptive layer has a surface roughness (JIS-B06011994) of 0.15 &mgr;m or more in terms of arithmetic mean deviation Ra and 1.00-3.00 &mgr;m in terms of 10-point height of irregularities Rz. It shows good transfer of the ink layer of ink ribbon and excellent fixation of the ink layer, and it enables production of a printing plate having excellent printing durability.

Lithographic plate material

There is provided a lithographic plate material which can be desensitized by distilled water or a fountain solution used for other lithographic plates, without desensitizing using an etching solution, and with less scumming in non-image portions of the print. The lithographic plate material has an image-receptive layer formed on a support and containing polyvinyl alcohol cross-linked by tetra alkoxy silane hydroxylate, titanium oxide microparticles, and silica having an average particle size of 1 nm to 100 nm. The image-receptive layer has a surface with an arithmetic mean roughness of not less than 0.40 &mgr;m and less than 1.20 &mgr;m, a contact angle of less than 50 degrees with distilled water at room temperature, and ink-receptiveness for hot-melt and lipophilic ink.

Lithographic plate materials and method for making lithographic plates using the same

The present invention is directed to a printing plate using an indirect electrophotographic process. The printing plate comprising an image receiving layer provided on a surface of plastic film wherein the image receiving layer comprises two types of extender pigments having different average particle size range to impart unevenness to the surface of the image receiving layer. The printing plate is suitable for use as a printing plate for lithography.

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Tokyo, Japan

Junichi Nouda