| 摘要 |
PROBLEM TO BE SOLVED: To resolve the problem wherein extruding a ceramic material by using a screw causes an orientation (twisting) rejoined under spreading in an expansion direction after passing the spider a gas cavity defect to grow into a spider mark caused by a large warpage failure (an eccentricity amount failure) and a spider after burning, in the presence of an unevenness of a density, namely generation of roughness, in the longitudinal direction of a cylindrical body its self. SOLUTION: There are provided: screw for transferring the cylindrical body, inside hole of the cylindrical body and extruding a material supplied to the inside hole; a raw material molding die with a through hole gradually reducing the diameter to the extruding direction of the raw material; a first partition member having a first hole for passing the raw material, and arranged inside the inside hole; and a second partition member having a second hole for passing the raw material, and arranged inside the through hole. COPYRIGHT: (C)2007,JPO&INPIT
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