D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 3/00 (2006.01) D21F 3/02 (2006.01) D21F 3/04 (2006.01)
Patent
CA 2099379
Method and device in the press section of a paper machine for detaching the web (W) from a smooth mantle face (18') of a press roll (18). In the method and in the device, a transfer zone (40a; 50a) is employed, over which a press fabric (23) or a particular transfer fabric (44) is passed so as to accomplish a closed draw of the web (W). The transfer zone (40a, 50a) as well as said fabric (23; 44) form a transfer nip (N s) or a transfer zone with the roll face (18'), At the transfer point, the temperature level (T) of the roll face (18') and/or of the web (W) is set or regulated so high that the pressure (p s) of saturated vapour of the water present in connection with the web (W) and with the roll face (18') which corresponds to said temperature level (T) is substantially equally high as, or just little higher than, the pressure (p o) that has been set to prevail in said transfer zone (40a, 50a), said pressure (p o) being preferably lower than the atmospheric pressure.
Procédé et dispositif relatifs à la presse d'une machine à papier et servant à détacher la bande (W) de la face externe lisse (18') d'un cylindre de pression (18). Dans le procédé et le dispositif, on utilise une zone de transfert (40a, 50a) sur laquelle passe une bande de toile (23) ou une toile de transfert spéciale (44) pour exercer une tension en circuit fermé sur la bande (W). La zone de transfert (40a, 50a), ainsi que ladite toile (23, 44) constituent un pincement (NS) ou zone de transfert avec la face du cylindre (18'). Le niveau de la température (T) de la face du cylindre (18') et/ou de la toile (W) au point de transfert, est réglé afin que la pression (pS) de vapeur saturée de l'eau présente dans la bande (W) et sur la face du cylindre (18') et correspondant audit niveau de température (T) soit sensiblement aussi élevée, ou un peu plus élevée que la pression (pO) réglée pour se maintenir dans ladite zone de transfert (40a, 50a), ladite pression (pO) étant, de préférence, inférieure à la pression atmosphérique.
Sim & Mcburney
Valmet Corporation
LandOfFree
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