Paper machine coating system
AssigneeWestvaco Corporation
InventorsWayne S. Bryant, James J. Masella, III
Life of this patent
Estimating the term…
Abstract
A low contaminant level is maintained in a high flow rate paper machine coating fluid circulation system by shunting a significant minority portion of the total flow through a full flow, atmospherically open, self-cleaning screen having a fine mesh screen cloth. Accept flow from the open screen is directed to the flow inlet of an entrained air purging apparatus for dispersing consolidated particulates of excessive size. Flow from the particulate disbursing apparatus is thereafter pumped through an enclosed pressure screen of moderate screen mesh.
Claims18
An apparatus for removing contaminated particles from a fluidized paper web coating material circulation system, said apparatus comprising:
- a paper web coating means for coating said web with a coating material;
- a particle dispersing means operatively connected to said paper web coating means by a first conduit means such that substantially all of an unconsumed, contaminated coating material flows through said first conduit means to said particle dispersing means;
- a pressure screen means operatively connected to said particle dispensing means by a second conduit means such that a majority portion of a coating material flow leaving said particle dispersing means flows through said second conduit means to said pressure screen means;
- and
- an open screen means operatively connected to said particle dispensing means by a third conduit means such that a minority portion of said coating material flow leaving said particle dispersing means flows through said third conduit means to said open screen means and said open screen means being operatively connected to a contaminated particle disposal means.
A method for removing contaminated particles from a circulation system for a fluidized paper web coating material comprising the steps of:
- providing a fluidized paper web coating material circulation system, said system including a paper web coating means, a particle dispersing means, a pressure screen means, an open screen means and first, second and third conduit means:
- contacting a paper web with a paper web coating material in said paper web coating means;
- collecting an amount of said paper web coating material which is contaminated and not consumed by said paper web in said paper web coating means;
- transporting contaminated coating material to said particle dispersing means along said first conduit means;
- dispersing contaminates located within said contaminated coating material by said particle dispersing means to produce a first cleaned coating;
- transporting a majority portion of said first cleaned coating to said pressure screen means along said second conduit means;
- cleaning said first cleaned coating in said pressure screen means to produce a second cleaned coating;
- transporting said second cleaned coating from said pressure screen means to said paper web coating means;
- transporting a minority portion of said first cleaned coating to said open screen means along said third conduit means;
- cleaning said first cleaned coating in said open screen means to produce a third cleaned coating;
- transporting said third cleaned coating from said open screen means to said particle dispersing means;
- and
- transporting substantially any contaminants removed from said first cleaned coating by said open screen means to a contaminant disposal means.
Dependencies are inferred from the claim text.