Valmet Ab

Valmet Aktiebolag

Goeran Ekstroem

Karl-Johan Tolfsson

Jan Paulsson

Tord Gustavsson

Joakim Aronsson

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.

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Vaese, Sweden

Goeran Ekstroem