Gas free valve for pulp vacuum washer and method

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With washing

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Reexamination Certificate

active

07981248

ABSTRACT:
A method of treating pulp on a porous surface of a rotating drum cylinder having a lower drum portion in a vat of pulp slurry and a radial array of filtrate conduits including: as the porous surface of the drum rotates through the vat, drawing filtrate from the slurry through the porous surface by the application of a suction to the filtrate conduits vacuum; draining the filtrate from the filtrate conduits into the filtrate chamber and to a filtrate suction conduit extending to an elevation below the vat; forming a pulp mat on the porous surface which passes filtrate and substantially blocks fibers in the pulp slurry; removing the pulp mat on the porous surface from the vat as the drum rotates; draining filtrate from the filtrate suction conduit, and before excessive gases passing through the porous surface enter the filtrate conduits, switching a fluid flow downstream of the filtrate conduits to a gas vent passage offset and below from a drum rotational axis.

REFERENCES:
patent: 3363774 (1968-01-01), Luthi
patent: 4154687 (1979-05-01), LaValley
patent: 4383877 (1983-05-01), LaValley
patent: 4419165 (1983-12-01), LaValley
patent: 4683059 (1987-07-01), LaValley
patent: 4822488 (1989-04-01), Shatuck
patent: 5264138 (1993-11-01), Heino et al.
patent: 5503737 (1996-04-01), Luthi
patent: 5683582 (1997-11-01), Luthi
patent: 6631810 (2003-10-01), Lamas et al.
patent: 7575658 (2009-08-01), Grace
patent: 2 062 957 (1991-01-01), None
patent: 2 182 833 (1997-02-01), None
patent: 2008/063122 (2008-05-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Gas free valve for pulp vacuum washer and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Gas free valve for pulp vacuum washer and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas free valve for pulp vacuum washer and method will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2721007

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.