Twin-wire paper machine and method of opertion

Details Twin-wire paper machine and method of opertion Twin-wire paper machine and method of opertion

D - Textiles, Paper

21

F

92/15, 92/14.1

D21F 1/00 (2006.01) D21F 2/00 (2006.01) D21F 9/00 (2006.01) D21F 11/02 (2006.01)

Patent

CA 1176492

A method for use in the wire section of a paper machine, and a twin-wire former for carrying out the method. ABSTRACT The invention provides a method for dewatering the web and for detaching a web from a second wire in the wire section of a paper machine, where the forming of the web partly at least takes place between two wires, comprising: feeding a sandwich structure constituted by the first wire, the wet fibre web and the second wire to a dewatering and detaching area and contacting the first wire with a first cover member of a special suction box; causing a directional change in the run of said sandwich structure with the aid of a guide roll of the second wire pressing against the sandwich structure from the side of the second wire, producing a dewatering effect of the web mainly in the area of the direc- tional change or adjacent partly thereto with the aid of the pressure of said wires and of centrifugal force acting on the web and partly with the aid of differential pressure caused by the special suction box, separating the second wire from said sandwich structure and causing the second wire to follow said guide roll and simultaneously subjecting the web together with the first wire to the subatmospheric pressure prevailing in said special suction box, and contacting the first wire with a second cover member of said special suction box.

372973

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