Twin wire former for a paper machine

Details Twin wire former for a paper machine Twin wire former for a paper machine

1989-05-22

1990-05-15

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162303, 162352, D21F 100

Patent

active

049255312

ABSTRACT:
A twin-wire former for a paper machine having a lower wire and an upper wire. The former has a twin-wire forming zone which has forming members and forming zones situated in a specific sequence as follows. A downwardly curved forming zone is confined to a sector of a large-diameter forming roll mounted on a frame of a lower wire unit, the magnitude of this sector being within the range of <90.degree.. A second forming roll then follows which is preferably provided with a hollow face and onto which the wires arrive from the first forming roll. The twin-wire forming zone is curved within a certain sector of less than 90.degree. on the second forming roll so as to become horizontal. A forming shoe is provided with a ribbed deck and fitted after the second forming roll inside the lower wire loop, this forming shoe having a relatively large curve radius after which the twin-wire forming zone ends and the web is arranged to follow along with the lower wire.

REFERENCES:
patent: 4209360 (1980-06-01), Stenberg
patent: 4417950 (1983-11-01), Bubik et al.
patent: 4532008 (1985-07-01), Creagan et al.

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