Method of producing printed matter

G - Physics – 03 – G

Patent

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Details

G03G 7/00 (2006.01) D21H 19/38 (2006.01) D21H 19/82 (2006.01)

Patent

CA 2397096

A method for producing printed products, according to which method the surface of a sheet of paper or board is printed by the electrophotography technique or a similar printing method, wherein a dry finely-divided printing ink is transferred onto the printing base by means of an electric field. According to the invention, a paper or board is used the printing surface of which has a pigment-containing coating layer in which at least 20 % of the pigment is made up of a hydrous pigment, such as gypsum, or in which at least 20 % of the filler is made up of a hydrous filler, such as gypsum. When a gypsum pigment and/or a gypsum filler is used, the quality of the printed image is not sensitive to the control quantities used in the printing press. By means of the invention, a very regular print is indeed obtained, and so the invention is especially well suited for the printing of a sheet of a very matt paper or board.

La présente invention concerne un procédé de production de produits imprimés. Selon ce procédé, la surface d'une feuille de papier ou de carton est imprimée au moyen de la technique électrophotographique ou d'une technique d'impression similaire. Une encre d'impression sèche finement divisée est transférée sur la base d'impression au moyen d'un champ électrique. Selon cette invention, on utilise du papier ou du carton dont la surface d'impression présente une couche de revêtement pigmentée, dans laquelle au moins 20 % du pigment est constitué d'un pigment hydraté, tel que du gypse, ou dans laquelle au moins 20 % de la charge est constitué d'une charge hydratée, telle que du gypse. Lorsqu'un pigment de gypse et/ou une charge de gypse est utilisé, la qualité de l'image imprimée n'est pas sensible aux quantités de commande utilisées dans la presse à imprimer. Cette invention permet d'obtenir une impression très régulière et convient donc notamment à l'impression d'une feuille d'un papier ou d'un carton très mat.

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