Roll for use in the production of paper and method for the...

D - Textiles – Paper – 21 – F

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Details

26/198, 92/21.5

D21F 3/08 (2006.01) C23C 4/02 (2006.01)

Patent

CA 2028335

The invention concerns a roll for use in the production of paper, in particular a renter roll in a press section of a paper making machine, with which the web is in direct contact and from which the web is detached. In the invention, a composite structure has been formed onto the cylinder mantle of the roll. According to the invention, the roll face is provided with a surface layer which protects the roll from wear and which provides good properties for detaching of the web, this surface layer being formed by thermal spraying of a powder wherein metal and ceramic phases are in the same powder particle. The roll face is additionally provided with a dense layer for protection against corrosion, which layer is made of stainless steel whose chromium content is 10 to 29% and which layer is placed between the surface layer and the roll mantle. The function of the layer for protection from corrosion is to protect the roll mantle from corrosion and to promote the adhesion of the surface coating to the roll. The invention also concerns a method for the manufacture of the roll.

La présente invention se rapporte à un rouleau utilisé dans une machine à papier, notamment à un rouleau situé dans la section presse d'une machine à papier, rouleau avec lequel la bande de papier se trouve en contact direct et duquel la bande de papier est détachée. En vertu de cette invention, une structure composite est formée à la surface de la chemise du cylindre. La surface du cylindre est revêtue d'une couche extérieure destinée à préserver le cylindre contre l'usure et laquelle possède des caractéristiques qui favorisent le détachement de la bande; cette couche extérieure est réalisée par pulvérisation thermique de poudre contenant des proportions égales de poudres céramiques et métalliques. La surface du cylindre reçoit aussi un revêtement haute densité de protection contre la corrosion en acier inoxydable dont la teneur en chrome se situe entre 10 et 29 %; ce revêtement est appliqué entre la couche extérieure et la chemise du cylindre. Le rôle du revêtement de protection contre la corrosion est de protéger le cylindre contre la corrosion et de favoriser l'adhérence de la couche extérieure au cylindre. L'invention vise également la méthode de fabrication du rouleau.

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