Abstract: An extrusion molding device 1 comprises a first pipe 10, a screw 2B that is provided in the first pipe 10, a second pipe 50 that is connected to the outlet of the first pipe 10, a flow adjustment plate 20 that is disposed between the first pipe 10 and the second pipe 50, and a die 90 that is connected to the outlet of the second pipe 50. The second pipe 50 includes, in order from the side of the first pipe 10, a first portion 32 having a constant inner diameter, a second portion 34 having an inner diameter that decreases as the second portion 34 extends from the first portion 32, and a third portion 36 having a constant inner diameter. The second portion 34 is undetachably integrated with the first portion 32, and the third portion 36 is undetachably integrated with the second portion 34.

Abstract: Provided is a green-honeycomb molded body holder which can suppress a decrease in the dimension accuracy of a green-honeycomb molded body. Provided is a green-honeycomb molded body holder 1G for supporting a side surface of an extruded cylindrical green-honeycomb molded body with the longitudinal direction of the green-honeycomb molded body horizontal, the holder 1G comprises flexible body sections 83a, 83b, the body section 83b has, in an upper section of the body section 83b, a groove 87 that supports a side surface of the green-honeycomb molded body, and a cavity 80 is formed below the groove 87 of the body section 83b.

Abstract: 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.

Abstract: Obtaining computer-tomography images of a first section at a distance Z1 from one end surface 112d of a honeycomb structure 100 and a second section at a distance Z2 larger than the distance Z1 from the end surface 112d of the honeycomb structure, determining the existence/nonexistence of a plugging portion 114 in 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.

Abstract: 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.

Abstract: Obtaining computer-tomography images of a first section at a distance Z1 from one end surface 112d of a honeycomb structure 100 and a second section at a distance Z2 larger than the distance Z1 from the end surface 112d of the honeycomb structure, determining the existence/nonexistence of a plugging portion 114 in 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.

Abstract: An object of the present invention is to provide a molding and a method for producing the same; a catalyst for the production of an unsaturated aldehyde and an unsaturated carboxylic acid, and a method for producing the same; and a catalyst for the production of methacrylic acid, and a method for producing the same. The molding of the present invention shows a shape including a plurality of columnar portions disposed with a predetermined gap; and bridge portions which are provided at both ends in longitudinal directions of two adjacent columnar portions and join adjacent columnar portions each other; and including through holes surrounded by a plurality of columnar portions in the longitudinal directions of the columnar portions, and openings formed on a peripheral surface by a gap between the plurality of adjacent columnar portions.

Abstract: There is provided a formed article characterized in that it includes a cylindrical coil member having spiral turns with a predetermined pitch thereof and a supporting member which extends along a direction parallel to an axis of the cylindrical coil member and which connects the spiral turns, and also provided a production process of the formed article characterized in that an extruder is used which includes a first die having a groove on its outer peripheral surface and a second die in the form of a ring which has a groove on its inner peripheral surface and into which the first die is fitted, and a forming material is extruded by the extruder while only one of the dies is rotated with respect to the other die.

Abstract: A high-strength ?-alumina formed body with a low soda content, of which pore distribution is controlled, can be provided in an easy and inexpensive manner. The ?-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° C., to rehydrate the formed body; and calcining the rehydrated formed body at about 1200° C. or higher. The ?-alumina formed body is useful as a carrier for catalysts, chemicals, microbes for food leftover disposal and the like.

Abstract: A high-strength ?-alumina formed body with a low soda content, of which pore distribution is controlled, can be provided in an easy and inexpensive manner. The ?-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° C., to rehydrate the formed body; and calcining the rehydrated formed body at about 1200° C. or higher. The ?-alumina formed body is useful as a carrier for catalysts, chemicals, microbes for food leftover disposal and the like.

Abstract: A high-strength &agr;-alumina formed body with a low soda content, of which pore distribution is controlled, can be provided in an easy and inexpensive manner. The &agr;-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 ° C., to rehydrate the formed body; and calcining the rehydrated formed body at about 1200° C. or higher. The &agr;-alumina formed body is useful as a carrier for catalysts, chemicals, microbes for food leftover disposal and the like.

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