D - Textiles – Paper – 21 – G
Patent
D - Textiles, Paper
21
G
D21G 1/00 (2006.01)
Patent
CA 2116298
(57) Abstract The invention concerns a method and a calender in calendering of a paper web, wherein the paper web (W) is passed through a calendering nip (N), which calendering nip (N) is formed between a roll (22) which has been provided with a soft face by means of a coating or in an equivalent way and a heatable hard roll (21). The heatable roll (21) is heated so as to plasticize the surface layer of the paper web (W) that is placed at the side of the heatable roll (21), preferably so that the temperature of the surface layer in the calendering nip (N) exceeds the glass- transition temperatures of the polymers contained in the paper. In the method, before entering into the calendering nip (N), the paper web (W) is moistened, so as to lower the glass-transition tem- peratures of the polymers contained in the paper, and pre-heated. The pre-heating of the paper web (W) is carried out by bringing the paper web (W) into contact with the heatable roll (21) before the web enters into the calendering nip (N) and by, before the calendering nip (N), feeding steam or water onto the face of the paper web (W) that is placed at the side of the heatable roll (21) so as to improve the transfer of heat from the hot roll to the paper web (W). (FIG. 3)
Ellila Markku
Koivukunnas Pekka
Kuosa Harri
Tani Mikko
Tuomela Jussi
Gowling Lafleur Henderson Llp
Metso Paper Inc.
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