Kanzaki Paper Mfg. Co., Ltd.

Mikio Takahashi

Kazuhiro Nojima

Tetsuya Hirabayashi

Kazuo Kojima

Hiromasa Kondo

Hitoshi Yamahira

Hiroyuki Fujimoto

Kouichi Shono

In a method of producing cast coated paper in which a wet coating layer containing as its main components, pigment and adhesive, is heated to permit a gel state to be formed in the layer, or is dried and then rewetted, and then is pressed against a highly polished finishing surface of a heated drum so as to be provided with a glazed finish. The present invention provides an improvement wherein an apparatus for emitting near-infrared radiations into the wet coating layer is employed as a means for permitting a gel state to be formed in the layer or as a means for drying the wet coating layer. The apparatus emits near-infrared radiations having wave lengths of 0.75 to 2.0 .mu.m at the peak wave length of their range which are directed into the wet coating layer.

Method of producing cast coated paper using near-infrared radiation

A method of producing cast coated paper in which a rewetted or gelled coating layer is pressed at a linear pressure of above 120 kg/cm against the highly polished finishing surface of a cast coating drum having a surface temperature of above 90.degree. C. Improved cast coating operations are secured by including in the coating composition and/or in the rewetting liquid or the gelling liquid, a releasing agent selected from the group consisting of a phosphate having a fatty hydrocarbon radical with 6 to 22 carbon atoms, an amine-salt thereof and lecithin.

Method of producing cast coated paper

A method of producing cast coated papers having a more uniform gloss, where the coated papers are produced by the rewet casting process, by using as the adhesive in the coating composition a copolymer latex containing as one of the copolymerized components an unsaturated carboxylic acid, and by adding to the coating, as an auxiliary agent, a metallic salt from a certain group.

An improved aqueous coating composition for the production of cast coated paper is disclosed. The pigment component of the coating contains at least 5% by weight of cubic calcium carbonate having a mean particle size of 0.1 to 1.0 micron. When this coating composition is used the operating speed of the cast coating process is remarkably improved and a cast coated paper having excellent whiteness, gloss and printability is obtained.

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Amagasaki, Japan

Mikio Takahashi