Patent ID: 11905658
Assignee: INTERNATIONAL PAPER COMPANY
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC D | IPC D

Claim 8:
9. A pulp refiner comprising:
a frame;
at least a first pair of refining members comprising:
a first refining member associated with the frame and comprising a first disc-shaped refining body including a first planar refining surface comprising: first refiner bars projecting outwardly from the first planar refining surface and forming first refiner grooves therebetween, each of the first refiner bars extending from a radially inward position on the first planar refining surface to a radially outward position on the first planar refining surface, and first projecting outwardly from the first planar refining surface, the first teeth being spaced apart from the radial outer edge of the first refiner bars by a substantially planar area; and
a second refining member associated with the frame and comprising a second disc-shaped refining body including a second planar refining surface comprising: second refiner bars projecting outwardly from the second planar refining surface and forming second refiner grooves therebetween, each of the second refiner bars extending from a radially inward position on the second planar refining surface to a radially outward position on the second planar refining surface, and second teeth projecting outwardly from the second planar refining surface, the second teeth being spaced apart from the radial outer edge of the second refiner bars by a substantially planar area,
wherein the frame is configured to position the first refining member coaxial with the second refining member with the first planar refining surface facing and spaced axially away from the second planar refining surface to define a refining space therebetween; and

a rotor associated with the frame and coupled to one of the first refining member or the second refining member such that rotation of the rotor effects movement of the first and second refining members relative to one another; and
wherein when a slurry of wood pulp comprising wood fibers is supplied to the frame, the wood pulp slurry passes through the refining space such that a significant number of the wood fibers in the wood pulp slurry are refined and a plurality of wood fiber bundles in the wood pulp slurry are separated.