Patent ID: 6235159
Filing Date: 2001-05-22
Classification: D21F

Abstract:
A headbox apparatus for a papermaking machine for producing a paper web from an infed stock, the headbox apparatus comprising:a single header for distributing an infed fiber stock across the width of the machine, the header having a single unitary outlet wall;a tube bank composed of a plurality of tubes, the tubes forming a plurality of stacked rows, wherein each tube extends in the machine direction and extends from the single header along the single unitary outlet wall to receive a flow of stock from the single header; anda nozzle chamber following and in direct flow communication with the header by means of the tube bank, wherein the nozzle chamber receives the stock from the tube bank through a discharge wall, and wherein the nozzle chamber has an upper wall contained within a first single plane which converges toward a lower wall contained within a second single plane, and is spaced from the lower wall to define a slice outlet, and wherein the tubes extend radially along lines which extend from the slice outlet, such that the tubes converge toward the slice outlet;wherein the first single plane intersects with the second single plane at an imaginary centerline extending in the cross-machine direction and which defines an intersection of said first single plane and said second single plane, and wherein each tube lies in a plane which extends radially from the centerline; andwherein the tubes in each row lie in a single plane.