Method for sealing of a coating on a roll

F - Mech Eng,Light,Heat,Weapons – 16 – C

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F16C 13/00 (2006.01) D21F 3/08 (2006.01) D21G 1/02 (2006.01)

Patent

CA 2362892

The invention relates to a method for seal-ing the coating and particularly an intermediate layer of a roll, particularly of a press roll such as the centre roll of a press or the back-up roll of an extended-nip press roll, used in a pulp, pa-per, board or finishing machine, and, further, to a roll and a coating for a roll. The corrosion resis-tance and impermeability of the roll coating, par-ticularly of such a coating that is made by ther-mal spraying, can be improved by way of seal-ing. The coating comprises a porous outermost surface layer (5) made out of a ceramic or ce-ramic-metal material by thermal spraying and at least one sealed layer (I, II) situated between said outermost surface layer (5) and the roll mantle (1).

L'invention porte sur un procédé d'étanchéification du revêtement et notamment d'une couche intermédiaire d'un rouleau, notamment d'un rouleau de presse, tel que le rouleau central ou le rouleau de soutien d'un rouleau de presse à pince allongée, utilisé dans une machine à fabriquer de la pâte à papier, du papier, du carton ou dans une machine de finissage, ainsi que sur un rouleau et un revêtement pour rouleau. La résistance à la corrosion et l'imperméabilité du revêtement du rouleau, notamment d'un revêtement formé par projection à chaud, peuvent être améliorées par étanchéification. Le revêtement se compose d'une couche superficielle extérieure poreuse (5) en matière céramique ou céramique-métal formée par projection à chaud et d'au moins une couche étanchéifiée (I, II) située entre ladite couche superficielle extérieure (5) et la couverture (1) du rouleau.

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