Device and method for defibration of wood
AssigneesMetso Paper, Inc., Myllykoski Oyj, Stora Enso OYJ, M-real Oyj, UPM-Kymmene Oyj
InventorOlli Tuovinen
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Abstract
A device for mechanical defibration of wood comprises a defibration surface for processing of wood raw material and loosening of fibers, said defibration surface comprising grinding grits fastened on a metal base surface. The grits (1) fastened on the metal base surface (2) are positioned within a determined distance from each other on the base surface, so that they form a regular defibration surface.
Claims28
A device for mechanical defibration of wood, comprising a defibration surface for kneading of wood raw material and loosening of fibers, said defibration surface comprising:
- a metal base surface;
- and
- grinding grits made up of hard particles, the grinding grits having a diameter of 100 μm to 700 μm;
- wherein the grinding grits are fixed to the metal base surface by a fixing method, and positioned so that the grinding grits form a regular defibration surface that is capable of effecting regular pressure pulses on wood as the defibration surface contacts and moves over the wood, wherein the grits are positioned in such a manner that a spacing distance between centers of the grits is 1 to 5 times the diameter of a grit.
A method for mechanical defibration of wood, in which wood raw material is kneaded and fibers are loosened by means of a moving defibration surface that is in contact with the wood and formed on a metal base surface, wherein grinding grits made up of hard particles and fixed to the metal base surface by a fixing method are positioned within a determined distance from each other on the metal base surface, so that the grits form a regular defibration surface, wherein the grits have a diameter of 100 μm to 700 μm and the grits are positioned in such a manner that a spacing distance between centers of the grits is 1 to 5 times the diameter of a grit, and wherein regular pressure pulses are effected on the wood by the defibration surface moving over the wood in contact therewith.
Dependencies are inferred from the claim text.