Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1993-03-05
1995-02-14
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
1623583, 1623591, 1623602, 162210, D21F 306, D21F 902, D21F 304
Patent
active
053892054
ABSTRACT:
Method and device in the manufacture of paper or board for dewatering of a paper web that is being manufactured. The paper web is transferred from a forming wire onto a wire in the drying section while constantly on support of a fabric that receives water, a transfer fabric, or of any other, corresponding transfer surface as a closed draw, at a particularly high speed, which is higher than about 25-30 m/s. Dewatering of the paper web is carried out by means of at least two subsequent press nips, of which nips at least one press nip is a so-called extended-nip zone, whose length in a machine direction is larger than about 100 mm. The extended-nip zone is formed in connection with a mobile flexible press-band loop. The distribution of the compression pressure employed within said extended-nip press zone is regulated and/or selected both in the transverse direction of the web and in the machine direction so as to set or to control the different profiles of properties of the web.
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Hirsimaki Martti
Karvinen Mikko
Kivimaa Juha
Lapotti Jorma
Pajula Juhani
Hastings Karen M.
Valmet Paper Machinery Inc.
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