Patent ID: 11965290
Assignee: INTERNATIONAL PAPER COMPANY
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC D | IPC D

Claim 0:
1. A method for processing wood fibers, comprising:
deflaking the wood fibers;
refining the wood fibers, wherein the deflaking and refining occurs within a single refiner having at least a first pair of refining members comprising:
a first refining member having a first refining body including a first refining surface comprising:
first refiner bars separated by first refiner grooves and extending from a first radially inward position to a first radially outward position on the first refining surface, the first refiner bars having a first height extending upward from a floor of an adjacent first refiner groove; and
second refiner bars separated by second refiner grooves and extending from a second radially inward position to a second radially outward position on the refining surface, the second radially outward position being nearer to an outermost part of the refining body than the first radially outward position, the second refiner bars having a second height extending upward from a floor of an adjacent second refiner groove, wherein the second height is a minimum height of the second refiner bars and is spaced apart from the second radially inward position, the second height being at least about 0.35 mm less than the first height;

a second refining member comprising having a second refining body including a second refining surface comprising second member refiner bars separated by second member refiner grooves, wherein the first refining member is spaced from the second refining member to define a refining space therebetween and at least a portion of the second member refiner bars are positioned so as to be across from the second refiner bars such that a gap between the portion of the second member refiner bars and the second refiner bars is defined;

rotating at least one of the first refining member or the second refining member such that the first and second refining members move relative to one another;
supplying a slurry of wood pulp comprising wood fibers to the refiner such that the slurry passes through the refining space; and
applying axial pressure to at least one of the first refining member or the second refining member as the slurry is supplied, wherein at least a portion of wood fiber bundles passing through the gap are separated.