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US 5,687,917 AGranted
High consistency pulp refining using low consistency pulp refining techniques
AssigneeCanadian Forest Products Ltd.
InventorsKim Shing Law, Suezone Chow
Life of this patent
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AssigneeCanadian Forest Products Ltd.
InventorsKim Shing Law, Suezone Chow
Estimating the term…
A refiner-apparatus and method for producing refined pulp by exerting mechanical forces on pulp fibres. The apparatus includes a member having a pulp side and a drainage side, the pulp side having a plurality of spaced apart raised bar portions thereon. A plurality of drainage conduits are formed in the member, the conduits extending between the pulp side and the drainage side of the member, each drainage conduit having inlet and outlet openings respectively. The inlet openings are disposed on the pulp side of the member and the outlet openings are disposed on the drainage side of the member such that water expelled from pulp fibres forced against the pulp side is received in the inlet openings and is conducted through the drainage conduits to the drainage side of the member. Generally, the method involves draining water from pulp fibres squeezed between facing refiner members, through at least one drainage conduit in at least one of the refiner members. Use of the method produces a low consistency pulp solution of refined pulp having properties comparable to high consistency refined pulp.
A refiner apparatus for exerting mechanical forces on pulp fibers, the apparatus comprising:
An apparatus for refining pulp, the apparatus including first and second sets of facing refiner bars having opposing pulp sides, at least one of said sets being moveable relative to the other, and the first and second sets being positioned relative to each other such that mechanical pressure is applied to pulp fibers between opposing pulp sides of said refiner bars when said at least one of said sets is rotated, at least one of said sets of refiner bars having a drainage side separated from said pulp face side and having a plurality of drainage conduits having inlet openings in said pulp side, said inlet openings being dimensioned to drain water from pulp fibers between said opposing face sides of said refiner bars while generally preventing said pulp fibers from entering said inlet openings.
A method of refining pulp between facing refiner members of a pulp refiner in which at least one of said facing refiner members is movable relative to the other, the method including the step of:
Dependencies are inferred from the claim text.