Patent ID: 6475344
Filing Date: 2002-11-05
Classification: D21F

Abstract:
A method of mixing jets of paper fiber stock emanating from a plurality of axially aligned tubular elements arranged as a matrix of rows and columns in a diffuser block coupled to a nozzle chamber in a paper forming machine headbox for discharging the paper fiber stock in a layered fiber structure for discharge upon a wire component moving in a machine direction (MD), the method comprising:generating jets of paper fiber stock emanating from the diffuser block in controlled axial vortices in the machine direction; disposing a divider sheet inside the nozzle chamber, the divider sheet having an upper surface and a lower surface opposite the upper surface and the lower surface respectively of the nozzle chamber; and securing an upstream lateral edge of the divider sheet between at least one of the rows of the matrix of rows and columns of the tubular elements of the diffuser block for controlling the flow of the paper fiber stock in the nozzle chamber wherein the plurality of tubular elements of said diffuser block have a longitudinal axis in the direction of the flow of stock, with at least one counter rotating vortex pair (CVP) being generated at one or more of said plurality of said tubular elements effective for swirling said stock in controlled pairs of axial vortices along the longitudinal axis of said tubular elements.