Pressing tool for producing dish-shaped pressed objects, in particular plates, cups, bowls, etc., of powders, preferably ceramic material

Claim 1

A pressing tool for producing dish-shaped pressed objects of powdery material, including a die and a counterdie whose front surfaces facing each other form the upper and lower sides of the dish-shaped pressed object when the powdery material filled in therebetween is pressed, the die and the counterdie being adapted to move toward each other comprising: an annular element supported on the die or counterdie and the powdery material being filled into a space limited by the front surfaces of the die and counterdie, said annular element having a connection for the feeding of material and at least one vacuum connection means, and said annular element being displaceable relative to the die and counterdie in their direction of movement toward each other, and at least one of the rims of the front surfaces of the die and counterdie protruding in an annular shape toward the rim of the other front surface, and the die and counterdie being adapted to move toward each other only so far as to leave a small axial annular gap between the rims of their front surfaces, wherein the axially protruding annular rim is supported on the corresponding die by an axially directed outer projection on which the annular element is displaceable; said vacuum connection means being axially offset with respect to an axial annular gap defined on the rim of the die and counterdie when the pressing tool is closed; and said vacuum connection further being in communication with said annular gap via at least one annular clearance.