Metso Paper Inc.

Valmet Ab

Anders Löfstrand

Peter Svedberg

Hans Lövgren

Leif Odmark

Jonas Magnusson

Peter Nykvist

Åke Sundström

Jörgen Lundberg

A pulp-filter arrangement () comprises a rotatable drum () and a non-rotating valve arrangement (). The rotatable drum () has a cylindrical water-permeable pulp-supporting shell (), a plurality of drain pipes () and a rotating hollow shaft (). The plurality of drainpipes () connects the rotating hollow shaft () with a collecting channel () situated radially directly inside the cylindrical water-permeable pulp-supporting shell (). The non-rotating valve arrangement () is disposed within the rotating hollow shaft () for sealing off the rotating hollow shaft () from a radially inner outlet () of the drain pipes () when respective radially inner outlet () is situated within a sealed zone. The non-rotating valve arrangement () is further arranged to, in a transition zone immediately following the sealed zone, open a throttled passage between the rotating hollow shaft () and the radially inner outlet ().

Rotary drum vacuum filter with a throttling valve

A frame for a twin-wire press is disclosed including pairs of side members including upper and lower side members arranged on opposite sides of the press, between which upper and lower rolls are attached, a plurality of transverse beams arranged between the pairs of side members which themselves are sections of flat sheet metal and spacers for mutually releasably connecting the side members with the sheet metal being formed so that it permits a degree of curing in the vertical plane to facilitate access to the space between the upper and lower rolls. A method for exchanging wire in a twin-wire press of this type is also disclosed.

Twin-wire press

Growing community of inventors

Sundsvall, Sweden

Anders Löfstrand