Process and equipment in the forming of paper web

Details Process and equipment in the forming of paper web Process and equipment in the forming of paper web

1985-01-22

1986-09-02

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

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

162211, 162301, 162352, D21F 100

Patent

active

046094350

ABSTRACT:
A process in the forming of a paper web, the dewatering of the pulp web, and of the paper web being formed comprises feeding the pulp suspension jet from the slice of the headbox into a gap formed by two wires, the gap becoming narrower in the feeding direction of the pump suspension jet. Water is removed from the pulp web when the web is in compression between the carrying wire and the covering wire within the twin-wire forming zone, which begins immediately after the feeding gap. The twin-wire forming zone is curved towards the loop of the carrying wire with a curve radius which is selected large enough so that the wire tensioning pressure resulting from it and acting upon the pulp web becomes low and the water removed from the pulp web is not splashed from the inside surface of the wire loop by the effect of centrifugal force dependent upon the curve radius. The joint run of the wires is passed over an open-surfaced forming roller, so as to be curved within a relatively small angle towards the loop of the covering wire. The joint run of the wires is passed over a forming roller, so as to be curved towards the loop of the carrying wire. The formed web is detached from the wire and transferred into the press section of the paper machine. A specifically structured twin wire former carries out the process.

REFERENCES:
patent: 3839143 (1974-10-01), Suckow
patent: 3846233 (1974-11-01), Kankaanpaa
patent: 3856618 (1974-12-01), Roell
patent: 3994774 (1976-11-01), Halme et al.
patent: 4125428 (1978-11-01), Phelps
patent: 4146424 (1979-03-01), Justus
patent: 4414061 (1983-11-01), Trufitt et al.
patent: 4417950 (1983-11-01), Bubik et al.
patent: 4447295 (1984-05-01), Bubik et al.
patent: 4517054 (1985-05-01), Hujala et al.
patent: 4523978 (1985-06-01), Pullinen

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