Method for manufacturing formed honeycomb structure

Abstract

A method for manufacturing a formed honeycomb structure in an efficient manner which comprises the steps of: charging a material for forming a honeycomb structure 5 into a passage for preform material for a honeycomb structure whose one end portion is provided with die 3 for forming a formed honeycomb structure; and extruding the charged preform material for a honeycomb structure 5 from the die 3 to form a formed honeycomb structure 10 while passing it through the passage, wherein a screen 4 for filtering foreign matters included in the preform material for a honeycomb structure 5 is disposed in the vicinity of the die 3 , and wherein an operation for reduction of frictional resistances between an inner face of the passage for preform material for a honeycomb structure and the preform material for a honeycomb structure 5 which passes the passage is employed.

Description

technical field [0001] The present invention relates to a method for producing a formed honeycomb body. More specifically, it relates to reducing the influence of the boundary portion of the molding raw material filled first and the molding raw material filled later on the molding in the case of subsequently adding the molding raw material to perform molding as the molding raw material filled into the molding machine decreases. A method of manufacturing a honeycomb formed body that can effectively use the forming raw material filled in the forming machine. Background technique [0002] As a filter (diesel particulate filter (DPF)) for trapping and removing particulate matter contained in dusty fluids such as diesel engine exhaust, or as a catalyst component for carrying and purifying harmful substances in exhaust gas ( As the catalyst carrier for purifying exhaust gas, a formed honeycomb body having partition walls forming a composite of a plurality of adjacent cells is wid...

AI Technical Summary

Problems solved by technology

[0028] In this way, in the conventional manufacturing method of the honeycomb formed body, when the molding raw material 25a is added afterward and the molding is performed as the molding raw material 25 filled in the molding machine 21 decreases, the molding raw material 25b filled earlier is included. Since the molded body of the boundary portion 28 with the post-filled molding material 25a cannot be used as a plurality of products, there is a problem that the molding material 25 is wasted until all the molding material 25 including the boundary portion 28 is extruded.

[0029] Moreover, in continuous extrusion molding, since there is no need to post-fill such molding raw materials, the boundary portion of the raw materials will not be formed. However, since the kneading process is completed by the built-in screw, the kneading of the molding raw materials is insufficient. , It is difficult to give the molding raw material viscosity. In order to improve the viscosity and ensure the formability, in order to strengthen the kneading function, there is a problem that it is necessary to increase the equipment capacity and add excess binder to the molding raw material, thereby increasing the cost.

[0030] In addition, as the outer diameter of honeycomb molding increases, there is a problem of enlarging the equipment in order to ensure extrusion pressure

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