Method for dewatering a web in a paper making machine employing

Details Method for dewatering a web in a paper making machine employing Method for dewatering a web in a paper making machine employing

1997-06-18

1999-02-02

Hastings, Karen M.

Paper making and fiber liberation

Processes and products

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

1623603, 1623583, D21F 304

Patent

active

058659544

ABSTRACT:
A Method for dewatering a paper web (W) formed in a preceding forming section of a paper making machine 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) or extended nip (NP.sub.2 ', NP.sub.3 '). 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), 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, N.sub.E) may be interposed between the center roll (30) and the succeeding drying section, between the forming section and the first extended nip (NP.sub.1), or between the first extended nip (NP.sub.1) and the center roll (30).

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