Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Patent
1996-06-21
1998-03-17
Lithgow, Thomas M.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Waste paper or textile waste
162 55, 209727, 209728, 209730, 209731, 209732, 209733, 209734, 2105122, D21D 524, B04C 304, B04C 528, B04C 504
Patent
active
057282625
ABSTRACT:
An asymmetric hydrocyclone is modified and controlled so as to effectively remove contaminants of substantially neutral buoyancy from a paper cellulosic pulp. More specifically, a method includes prepositioning a substantially frusto-conically-shaped separation chamber of the hydrocyclone at an oblique angle to a vertical axis, and introducing a cellulosic pulp through an inlet and into the separation chamber for separation processing. As is known, the pulp composition forms a downwardly-directed helical path, which in turn establishes an opposingly directed, upward helical air core. Centrifugal forces motivate heavier particles toward the sidewalls of the separation chamber and lighter particles are urged toward the air core, with particles of substantially neutral buoyancy circumferentially collected in an intermediate region, but in relatively close proximity to the air core. The method further includes the step of relationally controlling pulp composition pressure at the inlet and outlet to constrict and stabilize the air core and move the intermediate region containing neutrally buoyant contaminants into a reject stream formed near a reject tap.
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Butler Randolph S.
Moss Charles S.
Goldman Joel S.
Lithgow Thomas M.
Ross Gerald R.
Tetra Laval Holdings & Finance S.A.
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