Ishizuka Garasu Kabushiki Kaisha

Kawai-lime Ind. Co. Ltd.

Daito Kako Kabushiki Kaisha

Kabushiki Kaisha Hayashi Takatoshi Shyoten

Nagara Seishi Kabushiki Kaisha

Yoshio Hayashi

Kenji Kido

Yasuhiro Nishigaki

Riichiro Ieda

Fukashi Hashimoto

Koichi Morimoto

Kaichi Fujiyoshi

Toshikuni Ito

Method for manufacturing a plate boehmite and a plate alumina having high catalytic activity. The plate boehmite is prepared by subjecting at least one kind of an alkaline earth metal compound, which is selected from calcium, strontium and barium, and aluminum hydroxide to pressurization and heating at 150 to 300&deg; C. in the presence of water. The resulting reaction product is treated with an acid to remove the residual alkaline earth metal compound contained in the product, followed by rinsing with water. The resulting plate boehmite is subjected to calcination at 450 to 1500&deg; C. Thus, a plate alumina comprising a mixture of &thgr;-alumina and &dgr;-alumina as a major component is prepared.

Method for manufacturing plate boehmite

The present invention relates to a sheet which may be used in firing ceramic faced base plates, glass faced base plates and metal faced base plates. The sheet comprises a combustible sheet such as a pulp paper and a coating layer coated on at least one surface of the combustible sheet. The coating layer comprises a powder of a material with a high melting point and a powder of carbon which may be formed separately from the layer comprising the powder of a material having a high melting point. The coating layer comprising the powder of carbon effectively prevents shrinkage of the sheet during firing, and thus prevents adhesion between adjacent stacked base plates and between the base plates and the supporting base. The sheet of the present invention further provides a layer of a uniform breadth which prevents the formation of undulations and pin-holes in the base plates during firing.

Sheet for use in firing base plates

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Gifu, Japan

Yoshio Hayashi