Twin-wire former for the production of a web of paper

Details Twin-wire former for the production of a web of paper Twin-wire former for the production of a web of paper

1989-12-15

1991-05-28

Simmons, David A.

Paper making and fiber liberation

Apparatus

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

162303, 162308, 162352, 162354, 162363, 162364, D21F 100

Patent

active

050192140

ABSTRACT:
A twin-wire former for the production of a web of paper from a fiber suspension. An upper endless loop of wire belt having a lower horizontal run and a lower endless loop wire belt having an upper horizontal run. Guide rolls support the wire belts to define a twin-wire zone. The upstream inlet wedge of the twin-wire zone is disposed at the outlet from a head box. The initial part of the path of the twin-wire zone has a gradual curvature convexly with respect to the lower wire belt, and in that initial portion are positioned guide tables, suction boxes and dewatering elements. This curved initial part is followed by a forming roll within the loop of the upper wire belt. The twin-wires wrap an arcuate sector of the lower region of the forming roll. A support roll follows the forming roll. The support roll is upraised sufficiently to wrap the twin-wires around the bottom of the forming roll and over an arcuate sector at the top of the support roll. Following the support roll, the upper wire separates from the lower wire. In the continuing generally horizontal, slightly descending path of the lower wire with the web on it are disposed a plurality of suction boxes and a lower wire suction roll to define a final dewatering path after the twin-wire zone.

REFERENCES:
patent: 3876499 (1975-04-01), Vesanto
patent: 3944464 (1976-03-01), Means
patent: 4515542 (1985-05-01), Peschetz
patent: 4544447 (1985-10-01), Pinter et al.
patent: 4609435 (1986-09-01), Tissari

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