Presses – Methods – With heating or cooling
Patent
1994-03-02
1996-01-16
Gerrity, Stephen F.
Presses
Methods
With heating or cooling
100 74, 100 93RP, 100153, 100173, 162206, D21G 102
Patent
active
054838738
ABSTRACT:
A paper web is passed through a calendering nip that is formed between a roll which has been provided with a soft face and a heatable hard roll. The heatable roll is heated so as to plasticize the surface layer of the paper web that is placed at the side of the heatable roll, preferably so that the temperature of the surface layer in the calendering nip exceeds the glass-transition temperatures of the polymers contained in the paper. Before entering into the calendering nip, the paper web is moistened, so as to lower the glass-transition temperatures of the polymers contained in the paper, and pre-heated. The pre-heating of the paper web is carried out by bringing the paper web into contact with the heatable roll before the web enters the calendering nip and by, before the calendering nip, feeding steam or water onto the face of the paper web that is placed at the side of the heatable roll so as to improve the transfer of heat from the hot roll to the paper web.
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Ellila Markku
Koivukunnas Pekka
Kuosa Harri
Tani Mikko
Tuomela Jussi
Gerrity Stephen F.
Valmet Paper Machinery Inc.
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