Press section of a paper making machine employing an extended ni

Details Press section of a paper making machine employing an extended ni Press section of a paper making machine employing an extended ni

1994-11-01

1998-11-10

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

1623583, 1623602, 1623591, D21F 304

Patent

active

058338101

ABSTRACT:
A press section of a paper making machine for dewatering a paper web (W) formed in a preceding forming section in which dewatering felts (11, 28) are applied to both surfaces of the paper web (W) as the paper web (W) travels in a closed draw from the forming section through a first extended nip press (NP.sub.1), thereby drawing a substantial amount of water simultaneously and symmetrically from both surfaces of the paper web (W). The upper felt (11) transports the paper web (W) from the first extended nip (NP.sub.1) to a smooth surfaced center roll (30) where the paper web (W) passes through at least one roll nip (N.sub.1, N.sub.2). The center roll (30) is positioned at an elevation higher than the first extended nip (NP.sub.1) thereby reducing the length of the press section. In a second roll nip (N.sub.2), which may alternatively be an extended nip (NP.sub.3), a press fabric (33) is substituted for the upper felt (11) to efficiently remove additional water. Additional extended or roll nips (NP.sub.2, N.sub.3, N.sub.0) may be interposed between the center roll (30) and the succeeding drying section or between the forming section and the first extended nip (NP.sub.1).

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Wochenblatt fur Papierfabrikation 19 (1993), pp. 780 to 782 "Die Flexonip.RTM.-Pressen".

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