Refiner for refining lignocellulosic material and refining segments for such a refiner
AssigneeValmet Corporation
InventorsChrister Hedlund, Karl Lönngren, Mikael Lundfors
Life of this patent
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Abstract
A refiner for refining of lignocellulosic material includes a rotor disc and a stator disc. The rotor disc includes a first refining segment that includes a plurality of first protruding structures for grinding of the lignocellulosic material. Each of the first protruding structures is defined by a first height. The stator disc is arranged opposite the rotor disc and includes a second refining segment that includes a plurality of second protruding structures for grinding of the lignocellulosic material. Each of the second protruding structures being defined by a second height. The first height is at least three times larger than the second height.
Claims15
A refiner for refining of lignocellulosic material, the refiner comprising:
- a rotor disc comprising a first refining segment that includes a plurality of first protruding structures for grinding of the lignocellulosic material, each of the first protruding structures being defined by a first height;
- and
- a stator disc arranged opposite the rotor disc, the stator disc comprising a second refining segment that includes a plurality of second protruding structures for grinding of the lignocellulosic material, each of the second protruding structures being defined by a second height;
- wherein the first height is at least three times larger than the second height;
- and
- wherein the first protruding structures are separated from the second protruding structures by a disc gap;
- wherein the refiner is configured to facilitate refining of the lignocellulosic material in the disc gap;
- wherein the first refining segment is made from a first material;
- and
- wherein the second refining segment is made from a second material, the second material being harder than the first material.
A refiner segment pair comprising:
- a first segment configured to be used with a rotor disc for a refiner of a lignocellulosic material, the first segment comprising a plurality of first protruding structures for grinding of the lignocellulosic material, each of the first protruding structures defined by a first height;
- and
- a second segment configured to be used with a stator disc for the refiner of lignocellulosic material, the second segment comprising a plurality of second protruding structures for grinding of the lignocellulosic material, each of the second protruding structures being defined by a second height;
- wherein the first height is at least three times larger than the second height;
- where the first refining segment is made from a first material;
- and
- wherein the second refining segment is made from a second material, the second material being harder than the first material.
A refiner for refining of lignocellulosic material, the refiner comprising:
- a rotor disc comprising a first refining segment that includes a plurality of first protruding structures for grinding of the lignocellulosic material, each of the first protruding structures being defined by a first height being uniform from an inner radial surface of a corresponding one of the first protruding structures to an outer radial surface of the corresponding one of the first protruding structures;
- and
- a stator disc arranged opposite the rotor disc, the stator disc comprising a second refining segment that includes a plurality of second protruding structures for grinding of the lignocellulosic material, each of the second protruding structures being defined by a second height being uniform from an inner radial surface of a corresponding one of the second protruding structures to an outer radial surface of the corresponding one of the second protruding structures;
- wherein the first height is at least three times larger than the second height;
- and
- wherein the first protruding structures are separated from the second protruding structures by a disc gap;
- wherein the refiner is configured to facilitate refining of the lignocellulosic material in the disc gap;
- wherein the first refining segment is made from a first material;
- and
- wherein the second refining segment is made from a second material, the second material being harder than the first material.
Dependencies are inferred from the claim text.