Isostatic press mold for producing moldings from ceramic material

Claim 1

An isostatic press mold device for the production of dish shaped moldings having an outer face with a bottom portion and an inner face, said press mold device comprising two opposite mold units, a first mold unit having a first mold face corresponding to said outer face of said dish shaped molding, a second mold unit having a second mold face corresponding to said inner face of said dish shaped molding, said first and said second mold faces defining a mold cavity between them for receiving a charge of moldable, particulate, ceramic material, said first mold unit and said second mold unit being movable towards and away from each other in a moving direction perpendicular to said bottom portion between a mold cavity closed position and a mold cavity open position, at least said first mold face comprising an elastomeric press diaphragm of said first mold unit, said elastomeric press diaphragm having a peripheral edge zone sealingly fixed to said first mold unit, a back face of said elastomeric press diaphragm being exposed to a hydraulic pressure chamber within said first mold unit, said back face having a projectional surface area with two projectional surface axes perpendicular with respect to each other, said press diaphragm being provided with a plurality of channels substantially parallel with said moving direction, said channels opening into said back face and having closed ends adjacent said first mold face, said plurality of channels comprising more than five channels along each of said projectional surface area axes, said channels, having a cross-sectional area substantially invariable along the length of said channels, said cross-sectional area having two cross-sectional area axes perpendicular to each other, said cross-sectional area axes having substantially equal lengths.