Abstract: A press roll such as the center roll of a press or the back-up roll of an extended-nip press roll, used in a pulp, paper, board or finishing machine, has a coating with an intermediate sealed layer. The corrosion resistance and impermeability of the roll coating, particularly of such a coating that is made by thermal spraying, can be improved by way of sealing. The coating comprises a porous outermost surface layer made out of a ceramic or ceramic-metal material applied by thermal spraying and at least one sealed layer situated between the outermost surface layer and the roll mantle.

Abstract: A press roll such as the center roll of a press or the back-up roll of an extended-nip press roll, used in a pulp, paper, board or finishing machine, has a coating with an intermediate sealed layer. The corrosion resistance and impermeability of the roll coating, particularly of such a coating that is made by thermal spraying, can be improved by way of sealing. The coating comprises a porous outermost surface layer made out of a ceramic or ceramic-metal material applied by thermal spraying and at least one sealed layer situated between the outermost surface layer and the roll mantle.

Abstract: An abrasive-band grinding device for rolls and method for grinding rolls in which a motor rotates an abrasive band such that the abrasive band is pressed against the face of the roll to be ground. Guide pulleys are arranged in a loop of the abrasive band and, between the guide pulleys, a rotatable contact pulley is arranged over which the abrasive band is pressed against the face to be ground. The contact pulley is controlled by an actuator, preferably a motor, so that it can be inclined in relation to the roll face to be ground.

Abstract: The invention relates to a Yankee cylinder for a paper-making machine, in which a coating which is a mixture of a metal powder and a carbide or nitride and withstands well the wearing effect of the doctor blade and other corrosive and thermal stresses produced in paper-making is formed on top of the cylinder mantle. The invention also relates to methods for coating a Yankee cylinder with such a coating by using a detonation, plasma or supersonic method.

Abstract: A filler wire of a new type for use in arc-spraying, by means of which coatings highly resistant to mechanical and/or chemical wear can be produced. The wire comprises a soft sheath made from unalloyed or alloyed metal, inside which there is a very fine-grained filler material which contains, in addition to iron, other metals and/or special carbides and/or oxides, the powder being prepared by atomizing a melt of the said constituents.