Twin-wire forming section of a paper machine

Details Twin-wire forming section of a paper machine Twin-wire forming section of a paper machine

D - Textiles, Paper

21

F

92/14.1

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

Patent

CA 1176888

TWIN-WIRE FORMING SECTION OF A PAPER MACHINE ABSTRACT OF THE DISCLOSURE A lower wire loop of a paper machine has an initial single-wire portion of a dewatering zone defined by an initial portion of the wire of the lower wire loop, succeeded by an upper wire unit defining a twin-wire dewatering zone with a coinciding upper run of the wire of the lower wire loop. Dewatering occurs in the twin-wire dewatering zone through the wire of the lower wire loop and the wire of the upper wire loop. The twin-wire dewatering zone is located above the level of the initial portion of the wire of the lower wire loop. A first dewatering element is a first forming shoe in the direction of the web run in the upper wire loop. The twin-wire zone curves in a first direction in a first sector on the first forming shoe so that dewatering occurs primarily through the wire of the lower wire loop. A second dewatering element is a second forming shoe following the first forming shoe and spaced therefrom in the lower wire loop. The twin-wire zone curves in a second direction opposite to the first direction in a second sector on the second forming shoe so that dewatering occurs primarily through the wire of the upper wire loop.

402792

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