Three-layer headbox

  • US 6,059,929 A
  • Filed: 06/17/1997
  • Issued: 05/09/2000
  • Est. Priority Date: 06/17/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A headbox for producing a multilayer fiber web, the headbox comprising:

  • an inlet and an outlet;

    top and bottom walls spaced apart and generally angled toward each other from the inlet toward the outlet and in the direction of passage of a pulp suspension through the headbox from the inlet toward the outlet and exiting the headbox outlet onto a forming roll;

    first and second separating blades in the headbox between the top and bottom walls, the first blade being above and the second blade being below, the blades having upstream and downstream ends with respect to the passage of pulp through the headbox, the downstream ends terminating near the headbox outlet such that separation of the streams ends at or near the outlet;

    the blades being separated from each other and for defining a first chamber between the top wall and one of the first and second blades, a second chamber between the first and second blades and a third chamber between the bottom wall and another of the first and second blades;

    respective pulp suspension inlets through each of the three chambers;

    one of the first and second separating blades being hingedly supported at the upstream end thereof in the headbox on an axis across the headbox for enabling adjustment of its angular orientation around the hinge upwardly or downwardly, without external means acting on the one blade, for selectively controlling the velocity of the jet flow through the respective chambers defined respectively above and below the one blade; and

    the other of the first and second separating blades being rigidly mounted in the headbox and not adjustable in angular orientation with reference to the headbox.

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