| 摘要 |
PURPOSE:To improve the purification efficiency of waste gases and the buffer effect against thermal impact by forming the structural body of ceramic honeycomb in such a way that plural penetrating fluid passages thereof snake from an inlet toward an outlet. CONSTITUTION:A honeycomb of a straight pipe is extruded through an extrusion die part 12 of an extrusion molding machine 11. The preceding end part thereof is gripped with a chuck 14 and the extrudate is rotated in the direction at right angles to the longitudinal direction of the molded extrudate. More specifically, an extruded molding 13 is rotated circumferentially and the rotation is reversed. By the reiterative repetition of these rotations, snaking is formed, and the fluid passages of the honeycomb are formed to desired snaking shapes by controlling the extrusion molding speed thereof, and the rotating speed and distance of the molding. Thus the contact surface area of the fluid at the specified length of such structural body is increased, and the mutual effect of the wall surfaces of the penetrating holes and the fluid is increased, whereby the purification efficiency for waste gases is improved. Since the snaking is larger in the parts nearer the outside circumferential parts of the structural body, a buffer effect against thermal impact is improved. |
