Valmet Aktiebolag

Valmet Ab

Jan Paulsson

Karl-Johan Tolfsson

Joakim Aronsson

Goeran Ekstroem

Göran Ekström

Tord Gustavsson

Anders Leandersson

Peter Järkeborn

Frida Strandberg

Anders Brattström

Press body for use in extended nip presses for paper making

A tissue machine () has a Yankee () and a shoe roll () that forms a nip with the Yankee (). The nip has a maximum extension from an entry point () to an exit point (). A flexible belt () forms an outer circumference of the roll (). A fabric () carries a fibrous web (W) to the nip and passes through the nip with the web. The fabric () reaches the circumference of the roll () at a first contact point () and wraps the roll () from the first contact point to the nip. A mechanical support () inside the belt () supports the belt () between the first contact point () and the nip. The fabric () wraps the roll () from the first contact point () by more than 80&#xb0;. The invention also relates to a method of operating the machine.

Tissue paper making machine and a method of operating a tissue paper making machine

A method of making tissue paper is provided, in which a fibrous web is formed in a forming section and transferred to a Yankee drying cylinder in a non-dewatering transfer nip formed between the Yankee drying cylinder and a shoe roll. The shoe roll has a shoe that is deformable such that it can adapt to a cylindrical outer surface of the Yankee drying cylinder, and a rotatable flexible jacket arranged to run in a loop around the shoe. A structured carrier fabric runs around the shoe roll and has land areas and void areas facing the fibrous web. The length of the transfer nip is in the range of 30 mm -100 mm and the linear load in the transfer nip is in the range of 35 kN/m-120 kN/m. The peak pressure in the transfer nip lies in the range 2 MPa-8 MPa.

Method for making tissue paper

The invention relates to an extended nip roll () capable of forming a press nip (N) with a counter roll () which press nip (N) has an extension in a machine direction when the extended nip roll () cooperates with the counter roll (). The extended nip roll () comprises a flexible jacket; an elastic press body () arranged inside the flexible jacket. The top side () of the press body () is beveled in such a way that, in the machine direction, a working surface () of the top side has a downstream end () which, in the machine direction, is followed by an exit side surface () that diverges from the interior surface () of the flexible jacket (). The press body () further has at least a first and a second internal pressure chamber (). The pressure chambers () can be pressurized such that the press body () expands. The first internal pressure () chamber has an extension in the machine direction that does not extend beyond the working surface () and the second internal pressure chamber () is located downstream of the first internal pressure chamber () and has an extension in the machine direction beyond the downstream end () of the working surface (). The working surface () and the exit side surface () are made of a material that has a higher shore A hardness than the material in the rest of the press body (). The invention also relates to an extended nip press and a paper machine in which the extended nip roll is used. The invention further relates to a method of operating the extended nip press.

Extended nip roll, an extended nip press making use of the extended nip roll, a papermaking machine and a method of operating an extended nip press

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Kil, Sweden

Jan Paulsson