Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1983-04-29
1985-06-18
Smith, William
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162301, 162352, 162354, D21F 136
Patent
active
045239789
ABSTRACT:
A forming shoe in a two-wire forming section of a paper making machine has a curved guiding surface which guides a joint run of the wires and web interposed therebetween over a curved path of travel wherein the web is dewatered under the effect of the pressure between the wires at least in a direction away from the forming shoe, the dewatering action being assisted by the curvature of the forming shoe due to centrifugal forces. According to the invention, the length of the active portion of the forming shoe guiding surface, the surface quality or characteristics of the guiding surface and/or the radius of curvature of the guiding surface are adjustable so that web formation and the dewatering capacity of the forming shoe are controlled. For this purpose one or more devices are coupled to the forming shoe by which the attitude and/or location thereof is adjustable. In one embodiment a device is provided between the frame of the forming section and that of the forming shoe for pivoting the forming shoe about a horizontal axis and/or displacing the forming shoe linearly with respect to the vertical and/or horizontal plane.
REFERENCES:
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patent: 3323981 (1967-06-01), Heys
patent: 3994774 (1976-11-01), Halme et al.
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patent: 4033812 (1977-07-01), Riihinen
patent: 4146424 (1979-03-01), Justus
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patent: 4417950 (1983-11-01), Bubik et al.
Koskimies et al., "A Drainage Model for the Forming Zone of a Two-Wire Former", Papper Och Tra 1972 No. 4, pp. 137-146.
Hauptmann and Mardon, "The Hydrodynamics of Curved Wire Formers" Pulp and Paper Magazine of Canada vol. 74, No. 2, (Feb. 1973), pp. 72-77.
Hastings K. M.
Smith William
Valmet Oy
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