Tooth refiner plates having V-shaped teeth and refining method

A refiner plate comprising:

• a generally planar surface having annular rows of teeth arranged concentrically on the plate, and
• at least one of said rows includes teeth each having a leading sidewall, wherein the leading sidewall extends between a radially inward front face of the tooth and a radially outward rear face of the tooth;
• the leading sidewall includes a concave surface having a radially inward leading sidewall portion forming an exterior angle with respect to a radially outward leading sidewall portion, wherein the exterior angle between the radially inward leading sidewall portion and the radially outward sidewall portion is in a range of 170 degrees to 75 degrees and the radially outward leading sidewall portion forms an acute angle with respect to a radial line exending through the leading sidewall portion, and
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner.

A refiner plate comprising:

• a generally planar surface having annular rows of teeth arranged concentrically on the plate, and
• at least one of said rows includes teeth each having a leading sidewall, wherein the leading sidewall extends between a radially inward front face of the tooth and a radially outward rear face of the tooth;
• the leading sidewall includes a concave surface having a radially inward leading sidewall portion forming an exterior angle with respect to a radially outward leading sidewall portion, wherein the exterior angle between the radially inward leading sidewall portion and the radially outward sidewall portion is in a range of 165 degrees to 90 degrees and the radially outward sidewall all portion forms an acute angle with respect to a radial line extending through the leading sidewall portion, and
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner.

A refiner plate comprising:

• a generally planar surface having annular rows of teeth arranged concentrically on the plate, and
• at least one of said rows includes teeth each having a leading sidewall, wherein the leading sidewall extends between a radially inward front face of the tooth and a radially outward rear face of the tooth;
• the leading sidewall having a radially inward leading sidewall portion forming an angle with respect to a radially outward leading sidewall portion, wherein all portions of the leading sidewall are within an angle of zero degrees to 60 degrees with respect to a radial line of the plate, and the radially outward leading sidewall portion forms an acute angle with respect to a radial line extending through the leading sidewall portion and
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner.

A refiner plate comprising:

• a generally planar surface having annular rows of teeth arranged concentrically on the plate;
• at least one of said rows includes teeth each having a leading sidewall, wherein the leading sidewall extends between a radially inward front face of the tooth and a radially outward rear face of the tooth;
• the leading sidewall having a radially inward leading sidewall portion forming an exterior angle less than 180 degrees with respect to a radially outward leading sidewall portion, wherein the radially inward leading sidewall portion and the radially outward leading sidewall portion form a concave surface on the leading sidewall and the radially outward leading sidewall portion forms an acute with respect to a radial line extending through the leading sidewall portion;
• the teeth each including a leading edge angle of less than 90 degrees formed between the radially inward sidewall portion and a front surface of each tooth, wherein the leading edge angle is between the radially inward leading sidewall portion and the radially inward front face, and
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner.

A refiner plate comprising:

• a generally planar surface having annular rows of teeth arranged concentrically on the plate;
• at least one of said rows includes teeth each having a leading sidewall, wherein the leading sidewall extends between a radially inward front face of the tooth and a radially outward rear face of the tooth;
• the leading sidewall having a radially inward leading sidewall portion forming an exterior angle less than 180 degrees with respect to a radially outward leading sidewall portion, wherein the radially inward leading sidewall portion and the radially outward leading sidewall portion form a concave surface on the leading sidewall and the radially outward leading sidewall portion forms an acute angle with respect to a radial line extending through the leading sidewall portion and;
• at least one tooth having an interior angle less than 90 degrees between the leading sidewall and the front face, and
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner.

A refiner plate comprising:

• a generally planar surface having annular rows of teeth arranged concentrically on the plate, and
• at least one of said rows includes teeth each having a leading sidewall, wherein the leading sidewall extends between a radially inward front face of the tooth and a radially outward rear face of the tooth;
• the leading sidewall including a concave surface having a radially inward leading sidewall portion forming an exterior angle with respect to a radially outward leading sidewall portion, wherein a trailing sidewall of each tooth in said at least one of said rows have a convex profile, and
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner.

A refiner plate comprising:

• a generally planar surface having annular rows of teeth arranged concentrically on the plate, and
• at least one of said rows includes teeth each having a leading sidewall, wherein the leading sidewall extends between a radially inward front face of the tooth and a radially outward rear face of the tooth;
• the leading sidewall having concave surface include a radially inward leading sidewall portion forming an exterior angle of less than 180 degrees with respect to a radially outward leading sidewall portion, wherein the radially inward leading sidewall portion and the radially leading outward sidewall portion form a V-shape and the radially outward sidewall portion forms an acute angle with respect to a radial line extending through an apex of the V-shape, and
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner.

A refiner plate comprising:

• a generally planar surface having annular rows of teeth arranged concentrically on the plate, and
• at least one of said rows includes teeth each having a leading sidewall, wherein the leading sidewall extends between a radially inward front face of the tooth and a radially outward rear face of the tooth;
• the leading sidewall having a radially inward leading sidewall portion forming an angle with respect to a radially outward leading sidewall portion, wherein the leading sidewall has a concave profile and a trailing sidewall of each tooth in said at least one of said rows has a convex profile, and
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner.

A refiner plate comprising:

• a generally planar surface having annular rows of teeth arranged concentrically on the plate, and
• at least one of said rows includes teeth each having a leading sidewall, wherein the leading sidewall extends between a radially inward front face of the tooth and a radially outward rear face of the tooth;
• the leading sidewall having a radially inward leading sidewall portion forming an exterior angle with respect to a radially outward leading sidewall portion, wherein the leading sidewall has a concave profile, and the radially outward leading sidewall portion forms an acute angle with respect to a radial line extending through the leading sidewall portion and
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner.

A refiner plate comprising:

• annular rows of teeth wherein the rows are concentrically arranged;
• the teeth, in at least one of said rows, each include a leading edge facing a rotational direction of the plate or of another plate rotating with respect to the plate, and
• the leading edge forms an angle in a range of 5 degrees to 60 degrees between a leading sidewall of each of the teeth and a front face of each of the teeth, wherein the leading sidewall extends between a radially inward front surface of each of the teeth and a radially outward read surface of each of the teeth;
• the leading sidewall having a radially inward leading sidewall portion forming an angle with respect to a radially outward leading sidewall portion, wherein the leading sidewall has a concave profile and the radially outward leading sidewall portion forms an acute angle with respect to a radial line extending through the leading sidewall portion and
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner.

A refiner plate comprising:

• annular rows of teeth wherein the rows are concentrically arranged;
• the teeth, in at least one of said rows, each include a leading edge facing a rotational direction of the plate or of another plate rotating with respect to the plate, and
• the leading edge forms an angle in a range of 5 degrees to 60 degrees between a leading sidewall of each of the teeth and a front face of each of the teeth, wherein the leading sidewall extends between a radially inward front surface of each of the teeth and a radially outward read surface of each of the teeth;
• wherein the annular rows of teeth of the refiner plate mesh with and extend between annular rows of teeth on an opposing refiner plate in a refiner, and
• wherein, in the teeth in at least one of said rows, a leading sidewall including a V-shape having a radially inner leading sidewall section with the leading edge and a radially outward leading sidewall section slanted with respect to a radial of the disc in a direction opposing the disc rotation and the radially outward leading sidewall portion forms an acute angle with respect to a radial line extending through an apex of the V-shape.