Patent ID: 6802996
Filing Date: 2004-10-12
Classification: B28B,B29C

Abstract:
A method of molding a ceramic sheet using a molding apparatus comprising an extruder including an extrusion screw and a mold arranged at the forward end portion of the extruder, wherein the ceramic material introduced into the extruder is molded into a sheet by extrusion from the mold, and wherein the mold with ceramic material passing therethrough is divided into a plurality of transverse temperature regulated areas, the method comprising:introducing ceramic material into the extruder; advancing the ceramic material with the extrusion screw to the mold; passing the ceramic material through the mold; and regulating the temperature of said plurality of areas during the extrusion of the ceramic material from the mold, wherein the outer diameter d of the extrusion screw and the width W of the ceramic sheet hold the relation W&gE;3d, whereby wrinkling of the extrusion-molded ceramic sheet is substantially suppressed.