Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1986-06-03
1988-04-05
Bashore, S. Leon
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162207, 162209, 162211, 162300, 162301, 162351, 162357, D21F 100, D21F 160
Patent
active
047356863
ABSTRACT:
A method for forming a paper web by which web formation is improved and flocculation in the web is reduced includes the steps of feeding steam under pressure into the fiber suspension when the suspension enters into the gap of the former and as web formation is initiated over the perforated mantle of the forming roll. The steam is fed from a steam supply chamber or the like provided within the forming roll through the perforations in the roll mantle within a steam supply sector of the roll mantle. The steam feed is applied to the pulp web when the web is still substantially uncouched and in a manner such that when the steam condenses in the pulp suspension, an implosion is generated in the pulp suspension which produces high frequency mechanical vibrations which can be closely controlled to achieve the desired effects. A twin-wire former and forming roll therefor for applying the method are also disclosed.
REFERENCES:
patent: 1739038 (1929-12-01), Millspaugh
patent: 3839143 (1974-10-01), Suckow
patent: 3846233 (1974-11-01), Kankaanpaa
patent: 3981768 (1976-09-01), Lehtinen
patent: 3996098 (1976-12-01), Kankaanpaa
patent: 4306934 (1981-12-01), Seppanen
patent: 4363701 (1982-12-01), Kawae et al.
Bashore S. Leon
Hastings K. M.
Valmet Oy
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