1. A twin screw extruder comprising:
a dual cylinder housing;
two extruder screws located within said housing positioned and configured so that screw turns and screw lands of a first single screw extruder mesh with respective screw lands and screw turns of a second screw
2. A twin screw extruder according to claim 1 wherein said cell walls are arranged with a slope differing from a slope of said extruder screws.
3. A twin screw extruder according to claim 2 wherein said cell walls are
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