Method and apparatus for drying disintegrated fiber mass
AssigneeAktieselskabet Niro Atomizer
InventorsKarl Erik Hansen, Svend Hovmand, Mogens Lindskov Pedersen, Christian Schwartzbach, Myat Htun, Alf DE Ruvo, Soren Cavlin
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Abstract
A method and apparatus for drying disintegrated fiber mass or paper pulp comprising substantially free single fibers and wads or lumps of fibers. The disintegrated fiber mass is exposed to hot drying air or gas at a temperature of at least 180.degree. C. Free fibers are separated from the fiber mass during or after the drying process in order to avoid or compensate for excessive heating and drying of these free fibers. This facilitates a later grinding process in which the dried fiber mass is ground after addition of water.
Claims24
In a method of flash drying a fiber mass generally requiring subsequent grinding in an aqueous slurry in the manufacture of paper products wherein the fiber mass to be dried is disintegrated to comprise a disintegrated fiber mass which comprises substantially free single fibers, of which at least a part of the free single fibers are cellulose fibers, and wads or lumps of fibers and then the disintegrated fiber mass is subjected to a drying gas the improvement comprising exposing the said disintegrated fiber mass to flash drying by utilization of a drying gas at a temperature of at least 180.degree. C, to at least partially dry the free fibers and then separating a substantial part of the free fibers from the wads and lumps of the disintegrated fiber mass whereby the grindability of the free fibers is not substantially reduced.
An apparatus for flash drying a fiber mass generally requiring subsequent grinding in an aqueous slurry in manufacturing paper products, said apparatus comprising in combination means for disintegrating the fiber mass to be flash so as to comprises a mixture of substantially free single fibers and wads or lumps of fibers, flash dryer means receiving the disintegrated fiber mass for exposing the disintegrated fiber mass to a flow of hot drying gas to at least partially dry the free single fibers and dry the wads and lumps of the disintegrated fiber mass, and means for separating at least partly dried free single fibers from the wads or lumps of the disintegrated mass whereby the grindability of the free fibers is not substantially reduced.
Dependencies are inferred from the claim text.