Continuously variable sectioned headbox

Details Continuously variable sectioned headbox Continuously variable sectioned headbox

1998-05-22

1999-11-16

Silverman, Stanley S.

Paper making and fiber liberation

Processes and products

With measuring, inspecting and/or testing

162252, 162258, 162DIG11, 162343, D21F 106, D21F 108, D21F 1100

Patent

active

059850981

ABSTRACT:
Apparatus for influencing a cross-sectional profile of a headbox having an inner chamber and process for determining a width and position for the sections of the headbox. The apparatus includes a device for distributing fluid that extends across a machine width, at least one connection opening extending across the machine width between the fluid distribution device and the inner chamber of the headbox, and a plurality of elements being one of continuously and discretely adjustably positionable within the fluid distributing device to section the fluid distributing device across the machine width. The process includes measuring a profile of a selected characteristic of the pulp suspension in the headbox that is dependent on its position; forming intersecting points of the profile of the characteristic with a uniform sectioning of the size of the characteristic under consideration; and determining the position and width of the sections. In this regard, the width of respective sections correspond to a respective distance of the points of intersection of the profile of the characteristic with the uniform sectioning of the size of the characteristic under consideration, and the position is determined by the intermediate space between two respectively adjacent points of intersection of the profile of the characteristic with the uniform sectioning of the size of the characteristic under consideration.

REFERENCES:
patent: 5419813 (1995-05-01), Heinzmann
patent: 5707495 (1998-01-01), Heinzmann et al.
German Search Report dated Nov. 3, 1997 conducted in German Patent Application No. 197 23 860.2.

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