Process for preparing structural bodies of granular material

Abstract

A process for molding a structural body of ceramic or other granular materials which has hollow portions inwardly enlarged or complicatedly configured, which process comprises preparing a removable insert member which is fusible at temperatures not affecting an unbaked structural body and has the contours corresponding to an intended hollow portion, molding a structural body with ceramic or other granular material integrally with the removable insert member as by injection or transfer molding, heating as by electricity or hot fluids the insert member to cause the latter to be fused and formed with a through hole extending from end to end of the member, and blowing hot air into the through hole during a preliminary baking of the unbaked structural body so as to completely remove the insert member thereby to obtain a molded structural body of granular material provided with complicated hollow portions therein.

Dependencies are inferred from the claim text.