Patent ID: 7785094

Claim:
A high capacity extrusion die assembly comprising: an elongated tubular section having an axial length, an inlet end and an outlet end, with an internal bore presenting an axial length, and a longitudinal axis, and extending between said inlet end and said outlet end in a direction from said inlet end towards said outlet end; an elongated, axially rotatable screw assembly within said tubular section and having first and second axially rotatable, intercalated screw members, said first screw member having an axial length, a first screw inlet end proximal to said tubular section inlet end, and a first screw outlet end proximal to said tubular section outlet end, the diameter of said first screw inlet end being different than the diameter of said first screw outlet end, said first screw member having outwardly extending first flighting presenting first flighting outer surfaces and extending between said first screw inlet end and said first screw outlet end, said second screw member having an axial length, a second screw inlet end proximal to said tubular section inlet end, and a second screw outlet end, the diameter of said second screw inlet end being different than the diameter of said second screw outlet end, said second screw member having outwardly extending second flighting presenting second flighting outer surfaces and extending between said second screw inlet end and said second screw outlet end, said first flighting outer surfaces diverging along the length thereof in said direction, and said second flighting outer surfaces converging along the length thereof in said direction, said first and second screw members having different axial lengths; and a die unit associated with said tubular section outlet end and having a plurality of die openings therethrough configured to create a pressure drop across the die openings.