Twin-wire papermaking machine and method of dewatering a paper w

Details Twin-wire papermaking machine and method of dewatering a paper w Twin-wire papermaking machine and method of dewatering a paper w

1985-05-16

1987-05-05

Chin, Peter

Paper making and fiber liberation

Processes and products

Running or indefinite length work forming and/or treating...

162205, 162207, 162290, 162297, 162301, 162305, 162308, 162317, 162358, D21F 1100

Patent

active

046629920

ABSTRACT:
In a particularly simple construction a twin-wire papermaking machine possesses a reduced number of rolls as well as a compact arrangement. The foregoing and the greatest possible velocity of a through-passed paper web can be obtained by employing non-suction rolls, instead of suction rolls, in a pressing section of such papermaking machine, by upwardly entraining the paper web conjointly with a top or upper wire of a twin wire arrangement and by transferring the paper web to a pressing roll having a smooth surface, and furthermore, by providing at the pressing roll an extended or wide-nip supporting shoe by means of which the paper web is dewatered in an extended pressing nip zone. Advantageously, the dewatered paper web is taken off from the surface of the pressing roll in a downward direction and fed to a drying section of the papermaking machine. The drying section may be arranged below the pressing section and directly adjacent the bottom or lower wire of the twin wire arrangement. There is thus obtained a particularly compact construction.

REFERENCES:
patent: 3097994 (1963-07-01), Dickens et al.
patent: 3438852 (1969-04-01), Ely
patent: 3945881 (1976-03-01), Speidel
patent: 3996098 (1976-12-01), Kankaanpaa
patent: 4056433 (1977-11-01), Koponen et al.

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