Arrangement in a paper machine

Details Arrangement in a paper machine Arrangement in a paper machine

D - Textiles, Paper

21

F

92/21.2, 92/21.5

D21F 7/00 (2006.01) D21F 3/02 (2006.01) D21F 7/06 (2006.01)

Patent

CA 2002929

The surface properties of a roll and/or rolls in a paper machine are affected by relating the temperature of the roll face by means of an external heating device. In the arrangement, a combination of a heating device and a roll coating is used in such manner that the heating radiation penetrates through the paper or only directly to the roll face, but does not heat the roll itself at a depth greater than the roll face. The roll coating is preferably made of a dark, readily heatable and insulating material. The arrangement of the invention is utilized for example in a calendar and for detaching the paper from a roll.

Les caractéristiques de la surface d'un et/ou de rouleaux d'une machine à papier sont modifiées par le réglage de la température de la surface des rouleaux à l'aide d'un dispositif de chauffage externe. Dans l'invention, on utilise une combinaison du dispositif de chauffage et d'un revêtement du rouleau de façon que le rayonnement de la chaleur traverse le papier ou seulement la surface du rouleau, sans chauffer le rouleau plus profondément que sa surface. Le revêtement du rouleau est fait, de préférence, d'un matériau foncé, facile à chauffer et isolant. L'invention est utilisée dans une calandre et pour détacher le papier d'un rouleau.

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