Single-layer or multi-layer headbox for wide flow range

摘要

A single- or a multi-layer headbox of a paper or a board machine intended for consistencies of 0.7 - 2.2% and provided with a flow ratio adjustment device. The adjustment device operates by removing a part of the stock flow from the slice chamber (8) out of the headbox in a manner that does not change the speed or turbulence of the flow going to the slice at any point of the headbox.