Forming a fiber web using a widened jet of suspension

Details Forming a fiber web using a widened jet of suspension Forming a fiber web using a widened jet of suspension

D - Textiles, Paper

21

F

92/17, 92/17.1

D21F 1/00 (2006.01) D21F 1/02 (2006.01) D21F 9/00 (2006.01)

Patent

CA 2036446

FORMING A FIBER WEB USING A WIDENED JET OF SUSPENSION ABSTRACT OF THE DI DISCLOSURE A method and apparatus for minimizing damage from impingement of a jet of fiber suspension on a wire, roller surface or the like defining an inlet slot to a forming section which is opposite the headbox outlet nozzle by increasing the angle of spread and therefore the height of the jet where it impinges upon the surfaces. The opening angle of the jet is at least 3°, preferably between 15° and 60°. The jet widens, that is becomes taller, upon leaving the outlet nozzle from the headbox so as to impinge upon one or both of the moving surfaces defining the inlet slot, which surfaces may be defined by one wire or two wires or a wire and a roll. The outlet nozzle from the headbox may have a flow body in it which divides the flow before its exit from the outlet nozzle. A flow constriction at the outlet region of the nozzle, past the flow body if present, widens the jet as it leaves the nozzle. There may be inwardly directed ledges on the lips defining the nozzle near the nozzle outlet. There may be air inlets in one lip and a hump inside the nozzle on the other lip opposite the air inlets.

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