Headbox

D - Textiles – Paper – 21 – F

Patent

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Details

92/17.1

D21F 1/02 (2006.01)

Patent

CA 2000326

Headbox for the production of fibrous webs, such as paper Abstract of Disclosure The invention relates to a headbox of the type having a machine-wide outlet duct which is bordered by two duct walls converging in the direction of flow to form an outlet slot at the downstream end. One of the two duct walls is pivoted at its upstream end so that the clear width of the outlet slot can be regulated by means of a lifting appliance. Along the exterior of the adjustable duct wall there extends, parallel to the outlet slot, a beam on which the movable duct wall is supported via a back-pressure cushion. The beam is movably fixed (preferably pivoted) independently of the movable duct wall (preferably coaxially to the pivot axis of the movable duct wall) and the lifting appliance acts exclusively on the beam. Such an arrangement enables the movable duct wall to practically float on the stock suspension during normal headbox operation, with the result of improved uniformity of outlet slot and improved paper quality.

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