Metso Paper Inc.

Valmet Corporation

Martti Salminen

Antti Komulainen

Kari Juppi

Juha Kaihovirta

Juha Lipponen

Matti Kurki

Samppa J Salminen

Michael H Odell

Reima Kerttula

Antti Kuhasalo

Juha Leimu

Petter Honkalampi

Reijo Jokinen

Jyrki Savela

Markku Lummila

Veli-Matti Vainio

Riikka Antikainen

A device has two units placed one on top of the other, each unit comprising a first side frame (), a second side frame () spaced from the first side frame, and a band () running between the side frames (). Each unit () has a pressure chamber () attached to the side frames () and positioned in a sealed manner against the inner surface of the band ().

Method and device for changing a fabric in a paper or board machine

An arrangement and method for improving runnability, and dryer section length, by using a vertical impingement dryer before a first dryer cylinder of a group of dryer cylinders. After a pressing section, the web is dried with a pre-impingement dryer, closely followed by a vertical impingement dryer, which is closely following by the first dryer cylinder. The pre-impingement dryer and vertical impingement dryer of the first dryer cylinder to have a drying temperature of approximately 80&#xb0; C. with no undesirable sticking to the dryer cylinder. The pre-impingement dryer can be arranged to dry a first side of the web, and a vertical impingement dryer after the first dryer cylinder is arranged to dry a second side of the web. The impingement drying takes place directly against the web without an intervening fabric.

Arrangement in a paper machine

The invention relates to a sealing arrangement () against a moving fabric () in a paper machine or the like. The sealing arrangement includes a stiff sealing element () placed on the fabric's () side on the entire width in connection with a paper sheet () supported by the fabric (). The sealing element has been arranged on a support so that the location of the sealing element with respect to the fabric () can be adjusted nearer to or, correspondingly, further from the fabric. As a sealing element there is at least a single-chambered labyrinth sealing ().

Sealing arrangement against a moving fabric

An apparatus for a dryer section of a paper or board machine has a drying group (R) and an impingement drying unit () which is placed above and/or below a row (DSR) of drying cylinders (). A drying fabric () supported paper or board web () is conducted past the impingement drying unit () having at least one impingement surface (IP, IP) the side profile of which is straight, changeably curved in its radius of curvature, in the shape of a broken line or a selectable combination of these, and that the impingement surface or a tangent line to the impingement surface or a line passing via the beginning and the end of the impingement surface or an extension of the line forms on the impingement side an angle with a horizontal plane parallel to the machine level, which angle is &#x2266;120&#xb0;, advantageously 120&#xb0;&#x2013;60&#xb0;, most advantageously about 90&#xb0;.

Impingement drying unit and a dryer section

A drying unit in a dryer section of a paper or board machine including a drying wire guided in a loop, a large-diameter impingement-drying and/or through-drying cylinder arranged inside the drying-wire loop and smaller diameter smooth-faced heated contact-drying cylinders arranged on top of the large cylinder and/or in the vicinity thereof and at both sides thereof. The impingement-drying and/or through-drying cylinder is placed in a space below the floor level of the paper machine hall and provided with an openable and closable blow hood so that the removal of broke out of connection with the hood takes place substantially by the force of gravity. The central axes of the contact-drying cylinders placed in the vicinity of the large cylinder are placed in the vicinity of, or above, the floor level of the paper machine hall. A curve sector of the paper web on the outer face of the drying wire over the large cylinder greater than about 180.degree..

Drying unit and dryer section that makes use of such units

A method and arrangement for evaporation drying of a paper web in which the web is dried in three successive stages I, II and III that are carried out in the direction of progress of the web as follows: in the first stage (I), the web is heated in a short section in the machine direction quickly to a temperature of 55.degree. C. to 85.degree. C. minimizing web breaks of the relatively moist and weak web, after the first stage (I), the main evaporation drying of the web is carried out so that the evaporation efficiency and the rate of increase in the dry solids content of the web are substantially higher than in the first stage or in the final stage (III), and the web temperature does not substantially rise while the drying proceeds, and in the final stage (III), the drying is continued with a decreasing evaporation efficiency and an average rate of increase in the dry solids content of the web in the machine direction which is lower than in the preceding stage (II) but higher than in a conventional cylinder drying with single-wire draw so that the paper quality is controlled at the same time.

Method for optimizing of evaporation drying of paper, runnability, and

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Lievestuore, Finland

Martti Salminen