a press efficently dewaters a mass of wet fibrous material on all six sides by compressing the mass with a second ram against a plurality of liners arranged on a front face of the second ram , on a rear face of a door , and on a top wall , a bottom wall , and two opposing side walls of a press box . before entering the press box , a quantity of the mass of wet fibrous material is selected by a first ram which is guided a predetermined distance beneath a hopper of wet fibrous material by a pair of piston rods and cylinders arranged on opposite external sides of the first ram . on one side edge of the front face of the second ram and also on one side wall of the press box , there are positioned four - edged knives which cut off a selected quantity of wet fibrous material after such material is fed into the compression chamber but before such material is pushed into the press box by the second ram . a method for operating the dewatering press is also disclosed .