Metso Paper Inc.

Valmet Corporation

Valmet Oy

Osmo Nikulainen

Samppa J Salminen

Antti Leinonen

Seppo Kiviranta

Heikki Karttunen

Hannu Villgr&eacute;n

Miikka Kettunen

Ari Lehto

Mika Viertola

Vesa Kainu

The invention relates to a roll for a paper or board machine comprising axle journals on whose support the roll is arranged to revolve, end flanges with which the axle journals are connected, and a mantle which is connected with the end flanges. The mantle is provided with a number of openings extending through the mantle and/or recesses formed into the outer surface of the mantle, which openings and/or recesses form a regular pattern. Solid connecting portions in the outer surface of the mantle around said openings and/or recesses are opened so that, from each opening and/or recess, there is a connection, provided in the form of a groove or an additional recess extending into the outer surface of the roll mantle, with at least each of the openings and/or recesses adjacent to it.

Roll for a paper or board machine

The invention relates to a roll for a paper or board machine comprising axle journals on whose support the roll is arranged to revolve, end flanges with which the axle journals are connected, and a mantle which is connected with the end flanges. The mantle is provided with a number of openings extending through the mantle and/or recesses formed into the outer surface of the mantle, which openings and/or recesses form a regular pattern. Solid connecting portions in the outer surface of the mantle around said openings and/or recesses are opened to that, from each opening and/or recess, there is a connection, provided in the form of a groove or an additional recess extending into the outer surface of the mantle, with at least each of the openings and/or recesses adjacent to it.

An arrangement of equipment in connection with a variable crown roll provided with loading shoes to prevent foaming of fluid. The arrangement includes a separate guide and a face that guides the fluid in order to guide the fluid smoothly away from the inner face of the roll mantle of the roll and into a collecting trough.

Arrangement in a variable-crown roll provided with loading shoes

Gradient calender

Method in a variable-crown roll in which hydraulic loading elements or a series of hydraulic loading elements are used. Such series of elements acts along a plane of a nip that can be formed between the variable-crown roll and a counter-roll thereof, with such elements or series being situated between a central axle of the roll and a cylindrical mantle which is rotatable about the central axle through radial bearings. The central axle is supported by axle journals thereof on deflection bearings. In the method, the central axle is pivoted about the deflection bearings thereof over an angle which is within a range of about 30.degree. to 180.degree.. By the effect of such pivoting, the variable-crown roll and the mantle thereof are shifted away from the nip, so that the nip is opened. This shifting is produced by the axis of pivoting of the deflection bearings being situated by a certain eccentricity distance further away from a nip line of the closed nip, than the axis of rotation of the roll mantle.

Method and device in an adjustable crown roll

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Muurame, Finland

Osmo Nikulainen