US 7,476,292 B2
	Method and apparatus for use with a twin-wire press
Leif Ödmark, Matfors (Sweden)
Assigned to Metso Paper, Inc., (Finland)
Appl. No. 10/554,452 PCT Filed May 05, 2004, PCT No. PCT/SE2004/000684 § 371(c)(1), (2), (4) Date Oct. 25, 2005, PCT Pub. No. WO2004/099494, PCT Pub. Date Nov. 18, 2004.
Claims priority of application No. 0301307 (SE), filed on May 06, 2003.
Prior Publication US 2006/0254739 A1, Nov. 16, 2006
Int. Cl. D21F 1/80 (2006.01)

U.S. Cl. 162—203  [162/211; 162/301; 162/351]

9 Claims

1. A method for dewatering a fiber suspension in a twin-wire press, said method comprising feeding said fiber suspension to an inlet end of an elongated dewatering space defined by an endless lower wire and an endless upper wire, dewatering said fiber suspension in said elongated dewatering space during displacement of said endless lower and upper wires by forming a flow of filtrate from said elongated dewatering space through said endless lower and upper wires, collecting said filtrate in a pair of upper and lower outlet boxes, and adjusting the pressure differential between said elongated dewatering space and each of said pair of upper and lower outlet boxes by controlling the counter-pressure applied to said flow of filtrate on both sides of said endless upper and lower wires directly adjacent to said inlet end of said elongated dewatering space.