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

1983-09-26

1986-11-18

Alvo, Steve

Paper making and fiber liberation

Apparatus

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

162301, 162351, 162352, 162354, D21F 136, D21F 902

Patent

active

046234292

ABSTRACT:
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-water 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.

REFERENCES:
patent: 3846233 (1974-11-01), Kankaanpaa
patent: 3855057 (1974-12-01), Hill
patent: 3944464 (1976-03-01), Mears
patent: 3994774 (1976-11-01), Halme et al.
patent: 4100018 (1978-07-01), Wahren et al.
patent: 4153504 (1979-05-01), Justus
patent: 4363701 (1982-12-01), Kawac et al.

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