Patent ID: 6153057
Filing Date: 2000-11-28
Classification: D21F

Abstract:
A paper forming machine headbox component for receiving a paper fiber stock and generating a jet therefrom for discharge upon a wire component moving in a machine direction (MD), the headbox component comprising:a distributer for distributing stock flowing into the headbox component in a cross-machine direction (CD), the distributer effective for supplying a flow of said stock across the width of the headbox in the machine direction;a nozzle chamber having an upper surface and a lower surface converging to form a rectangular outlet lip defining a slice opening for the jet;a diffuser block coupling said distributer to said nozzle chamber, said diffuser block comprising a multiplicity of tubular elements disposed between said distributer and said nozzle chamber, said tubular elements being oriented axially in the machine direction, a plurality of the tubular elements having a longitudinal axes in the direction of the flow of stock, and the tubular elements arranged within the diffuser block as a matrix of rows and columns for generating multiple jets of said stock flowing into said nozzle chamber; andat least a partially closed and partially open central core element mounted within one or more of said plurality of said tubular elements of said diffuser block, said central core element having a plurality of fins and said partially open central core element located downstream said partially closed central core element, the partially closed central core element being effective for initiating swirling said stock in an axial vortice in the tubular elements as said stock flows through said tubular elements promoting mixing of the jets of said stock as said jets flow into said nozzle chamber from the tubular elements to form a uniform flow of stock at the slice opening for the jet.