Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1998-04-09
2000-03-14
Chin, Peter
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162361, 100153, D21F 300, D21H 1100, B30B 300
Patent
active
060368209
ABSTRACT:
Shoe press unit and method for treatment of a fibrous pulp web. The shoe press unit includes at least one press shoe, an opposing surface, a flexible press belt guided over the press shoe, and at least one force element composed of a cylinder/piston unit supported on a carrier. The at least one force element presses the press belt against the opposing surface to form a press zone elongated in a web run direction, and the cylinder/piston unit include a pressure chamber having at least one pair of cylinder/piston subunits successively positioned in the web run direction. Pressure fluid lines are coupled to respective ones of the at least one pair of cylinder/piston subunits to separately supply pressure fluid to each cylinder/pressure subunit to impart a tilting moment long a tilt axis substantially perpendicular to the web run direction. The method includes supplying a pressure fluid to a first and second pressure fluid line from a common pressure fluid source at a source pressure, supplying pressure fluid through the first pressure fluid line at a first fluid pressure to a first subunit of the at least one pair of cylinder piston subunits, supplying pressure fluid through the second pressure fluid at a second fluid pressure to a second subunit of the at least one pair of cylinder piston subunits, and maintaining a sum of the first and second fluid pressures to be substantially equal to the source pressure.
REFERENCES:
patent: 4568423 (1986-02-01), Laapotti
patent: 5167768 (1992-12-01), Cronin et al.
patent: 5650048 (1997-07-01), Swietlik
Copy of a German Search Report dated Jul. 1, 1997.
Kotitschke, "Neue Generation von Nasspressen fur Kraftliner und Testliner," Wochenblatt fur Papierfabrikation, No. 22, pp. 831-837 (1984).
Grabscheid Joachim
Hasenfuss Rudolf
Schiel Christian
Schuwerk Wolfgang
Chin Peter
Voith Sulzer Papiermaschinen GmbH
Walls Dionne A.
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