Sumitomo Chemical Company, Limited

Kazuya Tsuchimoto

Masaru Kitamura

Teruo Komori

Osamu Yamanishi

Hidekatsu Kawazu

Shuzo Murata

Yukihito Tokuoka

Atsuhiko Shinozuka

Disclosed is a method of examining defects in a green honeycomb molding having partition walls which form a plurality of flow channels extending in parallel with one another, and sealing portions which close the upper ends of some of the plurality of flow channels and the lower ends of the rest flow channels. The method includes a step of applying pressure to the lower ends of the plurality of flow channels using gas, and a step of visualizing the distribution of gas refractive indexes near the upper ends of the plurality of flow channels.

Green honeycomb molding defect examination method, green honeycomb structure manufacturing method, and green honeycomb molding defect examination device

Obtaining computer-tomography images of a first section at a distance Zfrom one end surfaceof a honeycomb structureand a second section at a distance Zlarger than the distance Zfrom the end surfaceof the honeycomb structure, determining the existence/nonexistence of a plugging portionin at least one of the plurality of passages based on the computer-tomography image of the first section, determining the existence/nonexistence of the plugging portion in the at least one passage based on the computer-tomography image of the second section, and determining the length of the plugging portion based on the result of determination of the existence/nonexistence of the plugging portion based on the computer-tomography image of the first section and the result of determination of the existence/nonexistence of the plugging portion based on the computer-tomography image of the second section.

Method and apparatus for inspecting honeycomb structure

A high-strength &#x3b1;-alumina formed body with a low soda content, of which pore distribution is controlled, can be provided in an easy and inexpensive manner. The &#x3b1;-alumina formed body can be produced by a method comprising calcining a gibbsite-phase aluminum hydroxide to obtain rehydratable alumina powder; forming the rehydratable alumina powder in the presence of water to obtain a formed body; maintaining the formed body in the presence of water at about 110-200&#xb0; C., to rehydrate the formed body; and calcining the rehydrated formed body at about 1200&#xb0; C. or higher. The &#x3b1;-alumina formed body is useful as a carrier for catalysts, chemicals, microbes for food leftover disposal and the like.

Method for producing &#x3b1;-alumina formed body

A process is disclosed wherein a zeolite molding having a high mechanical strength is produced by contacting a pentasil type zeolite molding with water.

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Niihama, Japan

Kazuya Tsuchimoto