Valmet Corporation

Valmet Paper Machinery Inc.

Pekka Taskinen

Mikko Karvinen

Antti I Ilmarinen

Antti Kuhasalo

Heikki Ilvespaa

Pertti Heikkila

Jouko Yli-Kauppila

Juhani Pajula

Juha Kivimaa

Matti Korpela

Dick Parker

Henrik Petterson

Jorma Laapotti

Vaino Sailas

Martti Hirsimaki

Ilkka Jokioinen

Iikka Jokioinen

Martti Hipsimaki

Jorma Lapotti

Va/ Ino/ Sailas

A method and device for drying a paper web wherein the paper web is supported on a drying wire without long open draws of the web. The paper web is contact-dried by pressing it with the drying wire onto a face of a contact-drying cylinder whose diameter is greater than about 1.5 m on a sector b whose magnitude is greater than about 180.degree.. The web is evaporation-dried as blowing-on drying and/or as through-drying by means of high-velocity drying-gas jets applied to the web on the drying wire on the face of the following large-diameter cylinder whose diameter is greater than about 2 m on a sector a having a magnitude greater than about 180.degree. while the web is on the side of the outside curve. The web to be dried is passed over a sector c of the suction roll which is subjected to negative pressure while the web is supported on the drying wire at the side of the outside curve. The magnitude of the sector of the suction roll has a magnitude greater than about 160.degree. and the diameter of the suction roll is less than the diameter of the contact-drying cylinder.

Drying method and drying module as well as dryer sections that make use

Method and device in the manufacture of paper or board for dewatering of a paper web that is being manufactured. The paper web is transferred from a forming wire onto a wire in the drying section while constantly on support of a fabric that receives water, a transfer fabric, or of any other, corresponding transfer surface as a closed draw, at a particularly high speed, which is higher than about 25-30 m/s. Dewatering of the paper web is carried out by means of at least two subsequent press nips, of which nips at least one press nip is a so-called extended-nip zone, whose length in a machine direction is larger than about 100 mm. The extended-nip zone is formed in connection with a mobile flexible press-band loop. The distribution of the compression pressure employed within said extended-nip press zone is regulated and/or selected both in the transverse direction of the web and in the machine direction so as to set or to control the different profiles of properties of the web.

Device for dewatering of a paper web including prepressing with extended

Drying module and dryer sections that make use of same, in particular

Method for dewatering of a paper web by pressing using an extended nip

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Jyvaskyla, Finland

Pekka Taskinen