Extrusion presses

Claim 1

AN EXTRUSIOIN PRESS COMPRISING MEANS DEFINING A PRESSURE CHAMBER, FEED MEANS FOR FEEDING PLASTIC MATERIAL TO SAID PRESSURE CHAMBER, SAID FEED MEANS COMPRISING TWO INDENTICAL AND AXIALLY PARALLEL ROLL-LIKE BODIES DIRVEN IN ROTATION IN OPPOSITE DIRECTIONS, EACH OF SAID BODIES BEING OF PRISMOIDAL SHAPE AND HAVING A PERIPHERY CONSTITUTED BY A PLURALITY OF AXIALLY EXTENDING BOUNDARY SURFACES, SAID MEANS DEFINING THE PRESSURE CHAMBER INCLUDING TWO OPPOSITELY DISPOSED DISPLACEABLE WALL PARTS WHICH CONSTITUTE STRIPPERS, AND MEANS SUPORTING SAID WALL PARTS WITH ENDS THEREOF IN CONTACTING ENGAGEMENT WITH THE BOUNDARY SURFACES OF SAID ROLL-LIKE BODIES DURING ROTATION OF SAID BODIES SUCH THAT SAID STRIPPERS ARE HELD AGAINST THE BOUNDARY SURFACES OF THE ROTATING ROLL-LIKE BODIES WITH A VARIABLE FORCE IN ACCORDANCE WITH THE PRESSURE OF THE PLASTIC MATERIAL IN SAID PRESSURE CHAMBER.