Patent ID: 6776941
Filing Date: 2004-08-17
Classification: B01D,B28B,B29C,B29L,B30B

Abstract:
A cold isopressing method for compacting a granular ceramic material, said cold isopressing method comprising:introducing said granular ceramic material into an isopressing mold having a cylindrical pressure bearing element and at least one mandrel located within said cylindrical pressure bearing element; sealing said cylindrical pressure bearing element; immersing said cylindrical pressure bearing element in a liquid and subjecting said cylindrical pressure bearing element to a hydrostatic pressure exerted through said liquid to compact said granular ceramic material; and relaxing said hydrostatic pressure; the cylindrical pressure bearing element being sufficiently rigid so as to maintain its shape during the introducing of said granular ceramic material and sufficiently resilient in a radial direction thereof to deform and bear against said granular ceramic material upon the application of said hydrostatic pressure and to at least substantially return to its original shape upon the relaxation of said hydrostatic pressure, thereby to allow retraction of said cylindrical pressure bearing element from said granular ceramic material after compaction.