Patent Document ID: 4220502
Application ID: 06008381
Patent Flag: 1

Claim One:
1. In a paper making machine, a twin wire forming section comprising: a lower endless carrying wire; a former roll disposed within the loop defined by said lower endless carrying wire, means defining at least one suction zone on said former roll, the carrying wire having a portion which laps a first sector of the former roll so as to define first and second substantially straight runs of the carrying wire prior and subsequent to said first sector of said former roll, respectively, in the direction of travel of said lower endless carrying wire, said first substantially straight run comprising an initial single-wire portion of a web-forming zone and said second substantially straight run adapted to cooperate with pick-up means at the end thereof; an upper endless covering wire having a portion directed by breast and traction rolls to lap at least part of that portion of the lower carrying wire which laps said former roll and so that the upper wire is spaced from said first substantially straight run, said lapping upper and lower wire portions defining a twin wire run intermediate of said first and second substantially straight runs, said twin wire run lapping a second sector of said former roll; means for adjusting the position of said breast and traction rolls in a substantially vertical direction so that the length of said second sector of the former roll lapped by said twin-wire run is adjustable but smaller than said first sector lapped by said carrying wire; a headbox having a lip slice disposed at the forward end of said initial single-wire portion; an open-surfaced forming board operatively associated with said initial single wire portion; and wherein the longitudinal axis of said headbox and the direction of travel of said initial single-wire portion are substantially longitudinally aligned and directed upwardly in the direction of travel of said carrying wire to define a first substantial acute angle with the horizontal and wherein said second substantially straight run is directed downwardly in the direction of travel of said carrying wire to define a second substantial acute angle with the horizontal and wherein the length and position of the twin-wire run is selectively adjustable by suitable adjustment of said breast and traction rolls.