Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1992-03-02
1993-08-31
Jones, W. Gary
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162198, 162252, 162263, D21F 300
Patent
active
052405648
ABSTRACT:
A method and apparatus in the press section of a paper machine for regulating the axial linear-load profiles in its nip or nips (N.sub.1,N.sub.2,N.sub.3). The axial temperature profile(s) of the outer mantle(s) of a press roll or rolls (11, 13, 16, 17) is/are regulated. Thereby, the distribution of the diameter of the press roll in the axial direction is controlled on the basis of thermal expansion. Also thereby, the distribution in the transverse direction of the machine of the linear load in the press nip or nips (N.sub.1,N.sub.2,N.sub.3) formed by the press roll or rolls (11, 13, 16, 17) is affected. The temperature profile of the outer mantle(s) (11', 13',17') of the press roll or rolls (11, 13, 17) is regulated by a press felt or felts (10, 14, 18) running through the press nip or nips (N.sub.1, N2, N3) formed by the roll applying a heating/cooling effect whose profile in the axial direction of the roll is regulated, and/or by applying a set of water jets (F) directly onto the outer mantle(s) of the press roll or rolls, the jets' quantity distribution (F.sub.1 . . . FN) and/or temperature distribution (T.sub.1 . . . TN) being regulated so as to obtain the desired distribution of np-pressure profile.
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Papermaking and Paperboard Making, 2nd Ed., vol. II (1970) pp. 624-625.
Niskanen Tapio
Uuttana Kvosti
Jones W. Gary
Lamb Brenda
Valmet Paper Machinery Inc.
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