Abstract: Multiple cutting discs are fixed in spaced-apart positions on each of two side-by-side counterrotating shafts so that peripheral portions of the discs on each shaft extend into the spaces between discs on the opposite shaft. Each disc has a smooth cylindrical peripheral surface which meets opposed sidewalls at sharp continuous cutting edges. The clearance between adjacent discs on opposed shafts is small so that their cutting edges coact to shear material fed into the bight between opposed counterrotating discs in their feed-through direction. Removable infeed teeth project from the peripheral surface of each disc at circumferentially spaced positions to help feed material into the bight between opposed discs. Material shredded by the discs falls onto a slowly rotating screening drum encircling the disc assembly. The smallest shredded pieces pass through such drum onto a discharge conveyor.

Abstract: Multiple cutting discs are fixed in spaced-apart positions on each of two side-by-side counterrotating shafts so that peripheral portions of the discs on each shaft extend into the spaces between discs on the opposite shaft. Each disc has a smooth cylindrical peripheral surface which meets opposed sidewalls at sharp continuous cutting edges. The clearance between adjacent discs on opposed shafts is small so that their cutting edges coact to shear material fed into the bight between opposed counterrotating discs in their feedthrough direction. Removable infeed teeth project from the peripheral surface of each disc at circumferentially spaced positions to help feed material into the bight between opposed discs. Material shredded by the discs falls onto a slowly rotating screening drum encircling the disc assembly. The smallest shredded pieces pass through such drum onto a discharge conveyor.