Controlled forming wire separation on impervious roll of twin-wire papermaking machine

  • US 3,876,498 A
  • Filed: 09/14/1973
  • Issued: 04/08/1975
  • Est. Priority Date: 09/14/1973
  • Status: Expired due to Term
First Claim
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1. A mechanism for continuously forming a fibrous web from a slurry of stock comprising in combination:

  • a first looped permeable woven outer forming wire;

    a second looped permeable woven inner forming wire;

    said wires positioned to form a converging throat leading to a forming run wherein the wires press against a web being formed therebetween;

    a headbox having an opening positioned to direct a stream of stock into said throat;

    guide rolls within each of the wire loops holding the loops in tension so that the outer wire applies a pressing force to press the stock between the wires in said forming run;

    a convexly curved surface within the second wire with the first and second wires wrapping said surface along said forming run;

    a first off running guide means for said first wire positioned following the forming run and separating the first wire from the second wire at a first separation point on said curved surface; and

    a second off running guide means for said second wire following said forming zone and separating the second wire from said surface at a second separation point immediately following the first separation point with the web following the second wire;

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