Anti-rewet deck for press rolls
AssigneeIngersoll-Rand Company
InventorsOscar Luthi, Antoine G. Abdulmassih, Frank J. Merchel, III
Life of this patent
Estimating the term…
Abstract
An anti rewet deck is provided for press rolls used to increase consistency of fibrous pulp slurry from approximately 4 percent up to about 30 to 50 percent. This is accomplished by biasing the location of the drainage holes in the roll shell to the forward edge of the drainage compartments within the roll shell. To avoid the necessity for handing of the rolls, a mechanism is provided for accomplishing the purposes of minimizing rewet at practical production rates by providing baffle plates which effectively orient the draining pattern in the desired direction. Such baffles can be permanently or removably installed once the desired handing of the rolls is determined.
Claims8
A deck for a liquid extraction press roll for processing fibrous materials, comprising:
- a rotatable hollow cylindrical roll shell having drainage holes located in circumferential grooves in an outer surface of said roll shell;
- an axial core for rotatably driving said roll shell, said core having mounted thereon longitudinal support ribs which support the roll shell and which define drainage compartments bounded by said axial core, said support ribs, and said roll shell;
- said support ribs further having cross-over ports which permit flow of liquid between said drainage compartments, each drainage compartment being bounded by two support ribs, said roll shell and said axial core, said axial core being rotated in a predetermined direction whereby one of said two support ribs is a leading support rib and the other of said two support ribs is a trailing support rib;
- perforated filter plates mounted upon said roll shell, said filter plates permitting passage of liquid therethrough into the circumferential grooves, through the drainage holes, and into the drainage compartments while retaining fibrous material upon an outer surface of said filter plates;
- and
- means for minimizing reflux of liquid from said drainage compartments, which have rotated to positions above a nip formed between said deck and a deck of a coacting liquid extraction press roll, back into said fibrous material on the outer surface of said filter plates, the means for minimizing reflux of liquid limiting the flow of liquid through the drainage holes into and out of a drainage compartment to an area proximate the leading support rib.
Dependencies are inferred from the claim text.