Valmet Paper Machinery Inc.

Valmet Corporation

Valmet Oy

Markku Karlsson

Kari Juppi

Raimo Virta

Pertti Heikkila

Pekka Eskelinen

Allan Liedes

Antti Suonper&auml;

Hannu Kokkala

Rainer Gartz

Matti Lepisto

Sakari Kaijaluoto

Sauli Laakso

Kari Edelmann

Pentti Raatikainen

Reijo Ilmanen

A method in a paper machine for arrangement of water circulation therefor and arrangement of a water circulation system in a paper machine. In view of full or partial closing of the water circulations in a paper machine, the wash water flows from the fabrics and from other devices in the paper machine as well as the water drained from the paper web to be produced are recovered selectively based on the place of origin thereof in the paper machine. At least a part of the recovered different water flows are cleaned, and the cleaned water flows are recirculated to applications of reuse suitable in view of their washing potential in the papermaking process.

Method and arrangement for circulating water in a paper machine

Dryer-section concept and method in the drying of a paper/board web

Method for on-machine coating-drying of a paper web or the like

Method of and device for pocket ventilation in the drying section of a

Method in the drying of a paper web or equivalent

Method and device in a drying group or groups provided with a single wire draw, in a multi-cylinder dryer of a paper machine for securing the threading of the web. The multi-cylinder dryer has drying cylinders heated by steam or equivalent, with the web to be dried being pressed by the drying wire into direct contact with cylinder faces of the drying cylinders. The multi-cylinder dryer also has leading cylinders or rolls on which the web remains outside the drying wire. In the area of single-wire draw, the leading cylinders or rolls are provided with a suction zone situated at a side of the service-side end of the rolls. The suction zone is provided by way of perforations passing through a mantle of the leading cylinders or rolls. The negative pressure present in an interior space in the leading cylinders is spread onto the outer faces thereof through the perforations and by way of grooves situated within the area of the suction zone and passing around the roll mantle. The sector of the leading cylinders or rolls that remains free from the drying wire and from the web, is closed over the suction zone by way of an outer closing arrangement.

Method and device for threading a web around drying cylinders

Method and device in a cylinder dryer of a paper machine, in which a paper web is guided in connection with upper cylinders by using an upper wire and in connection with lower cylinders by using a lower wire. The wires are guided by faces of the respective drying cylinders and by guide rolls situated in spaces between the cylinders so that on an upper line of cylinders the web is pressed by the upper wire into direct drying contact with the faces of the upper cylinders, and the web is pressed by the lower wire into the faces of the lower cylinders in a lower line of the cylinders. In the method and in the device, the web is passed from one line of cylinders to the other over a certain distance as an open draw. A drying-air blowing is directed at the drying wires within an area of a line at which the respective drying wires are detached from the respective drying cylinders. By way of such blowings, a moist boundary layer which is derived from water diffused in connection with the wires and from the web to be dried, is disrupted.

Method and device in a cylinder dryer of a paper machine

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Parainen, Finland

Markku Karlsson