Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1995-01-24
1997-03-18
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162305, 1623583, 1623591, D21F 306
Patent
active
056118937
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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Hipsimaki Martti
Karvinen Mikko
Kivimaa Juha
Laapotti Jorma
Pajula Juhani
Hastings Karen M.
Valmet Corporation
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