extruder:

extruder:a machine used for producing more or less continuous lengths of plastic sections. its essential elements are a tubular barrel;a hopper at one end from which the material to be extruded is fed to the screw, ram or plunger; and a die at the opposite end for shaping the extruded mass. extruders may be divided into three general types-single screw, twin-or multiple screw, and ram-each type has several variations.