D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
92/17.2
D21F 1/02 (2006.01) D21F 1/06 (2006.01)
Patent
CA 1092404
ABSTRACT OF THE DISCLOSURE: A paper machine headbox having a damping system for pressure variations in a pulp suspension flow, the headbox comprising header means for receiving pulp stock, distribution pipe means communicating with the header means for receiving pulp stock therefrom and conveying the pulp stock beyond said header means, flow-equalizing means communicating with the distribution pipe means downstream of the header means for receiving the pulp stock from the distribution pipe means-and equalizing the flow of the pulp stock, turbulence passage means communicating with the flow-equalizing means downstream of the distribution pipe means for receiving the pulp stock from the flow-equalizing means and conveying the pulp stock beyond said flow-equalizing means while reducing turbulence in the flowing pulp stock, and lip slice means communicating with the turbu- lence passage means downstream of the flow-equalizing means for receiving the pulp stock from the turbulence passage means and delivering the pulp stock to a lip slice which forms part of the lip slice means and through which the pulp stock discharges from the headbox. The header means and flow-equalizing means form a pair of means for respectively providing chambers in which pulp stock is situated while flowing from the header means to the lip slice means, and at least one of the pair of means in- cluding a wall means which defines part of the chamber of the one means and which is operatively connected with part of the one means for movement,under pressure fluctuations,with respect to the remainder of the one means for altering the volume of said chamber thereof.
288049
Kirjavainen Alvi
Robic Robic & Associes/associates
Valmet Oy
LandOfFree
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