Patent ID: 6962647

Claim:
A headbox for a paper machine, board machine, or pulp machine, which headbox is suitable for high fibre suspension consistencies which are in a range of 2–5%, and which headbox includes a turbulence part for producing a turbulent fibre suspension flow, into which turbulence part a fibre suspension flows from a fibre suspension distributor means, wherein the fiber suspension distributor means comprises a tube bank, and further comprising a plurality of explosion chambers before the turbulence part which receive the fibre suspension from the distributor means and which each equalize the transverse flow profile of the fibre suspension flow, and a slice part which is situated after the turbulence part and from which the fibre suspension flows to a forming section of a fibrous web, wherein the turbulence part comprises at least two passages, which converge in the flow direction of the fibre suspension towards the slice part of the headbox, in which connection the fibre suspension flow in each of the at least two passages is first fluidized in a tortuous turbulence passage part and, after that, it decelerates in a widening deceleration passage part, and wherein a separate explosion chamber is positioned before each of the at least two passages.