Method for calendering a board web

Details Method for calendering a board web Method for calendering a board web

D - Textiles, Paper

21

G

D21G 1/00 (2006.01)

Patent

CA 2406632

In the method, a long nip (N) shoe calender formed of a shoe roll (10) and a thermo roll (20) is used. In calendering, a nip dwell time which is over 10 ms, advantageously over 20 ms, a nip pressure which is below 3 MPa, advantageously below 1 MPa, and a surface temperature of the thermo roll (20) which is over 200 °C, advantageously over 250 °C, are used. In addition, the board web (W) surface to be pressed against the thermo roll (20) is moisturized before the nip. Image

L'invention concerne un procédé utilisant une calandre à long segment de pinçage (N) formée d'un rouleau à segment (10) et d'un rouleau chauffant (20). On utilise dans le calendrage un temps de passage de pinçage supérieur à 10 ms, avantageusement supérieur à 20 ms, une pression de pinçage inférieure à 3 MPa, avantageusement inférieure à 1 MPa, et une température de surface du rouleau chauffant (20) supérieure à 200 DEG C, avantageusement supérieure à 250 DEG C. En outre, la surface de la bande de carton (W) qui doit être pressée contre le rouleau chauffant (20) est humidifiée avant le pinçage.

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