Method for compensating for faults in a paper web

D - Textiles – Paper – 21 – F

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Details

D21F 2/00 (2006.01) D21F 1/02 (2006.01) D21F 1/04 (2006.01) D21F 1/06 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2697054

Method for compensating for uneven shrinkage in a paper web in the press and drying sections of a paper machine, in which there is at least one open draw. In the method, a flow guide/guides are used in the head box, by means of which the machine direction orientation tendency of the fibres is reduced in the edge areas of the web and the angle of detaching of the web from the centre roll is adjusted, by directing onto the web an air jet that is located in the cross direction and the pressure of which can be adjusted in the said direction.

L'invention concerne un procédé pour compenser un rétrécissement inégal dans une bande de papier dans les sections de pressage et de séchage d'une machine à papier, dans laquelle il existe au moins un tirage ouvert. Dans le procédé, un ou des guides d'écoulement sont utilisés dans la caisse d'arrivée, au moyen desquels la tendance des fibres à s'orienter dans le sens machine est réduite dans les zones de bordure de la bande et l'angle de séparation de la bande par rapport au rouleau central est ajusté, en dirigeant sur la bande un jet d'air qui se trouve dans le sens travers et dont la pression peut être ajustée dans ladite direction.

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