Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1995-06-06
1997-08-12
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162300, 162301, D21F 100, D21F 1100
Patent
active
056561334
ABSTRACT:
A hybrid former in a paper machine including a lower-wire loop in which there is an initial single-wire portion of a forming zone. In this initial portion, there are draining elements inside the lower-wire loop and thereafter wire-guide and draining elements. The former includes an upper-wire unit in which an upper wire is guided by guide rolls and by a breast roll onto a pulp layer formed on the single-wire portion of the lower wire. In a subsequent twin-wire portion following the single-wire portion, there is a draining and forming unit which includes at least one pressure-loaded press unit and at least one draining-chamber and support unit, which units are arranged inside opposite wire loops. In the units, there are sets of ribs which are pressure-loaded against each other. The breast roll is provided with an open face and is arranged in such a position that the area of the breast roll and upper wire that reach contact with the pulp web is pressed slightly into the upper face of the pulp web without curving the lower wire to a substantial extent.
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Hastings Karen M.
Valmet Corporation
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