Metso Paper Inc.

Valmet Corporation

Valmet Technologies, Inc.

Pekka Linnonmaa

Antti Heikkinen

Markku Kyytsönen

Pekka Koivukunnas

Mika Viljanmaa

Reijo Pietikäinen

Tapio Mäenpää

Kari Hasanen

Hannu Lätti

Vilho Nissinen

Kari Holopainen

Juha Lipponen

Pekka Kivioja

Harri Kuosa

Heikki Kettunen

Aaron Mannio

Seppo Luomi

Juha Ehrola

Mikko Tani

Risto Sutti

Matti Lares

Juha Laitio

Eero Suomi

Erkki Leinonen

Markku Kyyts&ouml;nen

Timo Vuorimies

Jari Ilomäki

Helena Leppäkoski

Markus Laitila

Henri Vaittinen

Ismo Kallio

Jani Hakola

Matti Tervonen

Pekka Moisio

Markku Kojo

Lauri Aaltio

Ville Vuorij&auml;rvi

Petri Ristola

Juhani Partanen

Marjaana Toppila

Toni Seppänen

Tarja Hanska

Olli-Pekka Väkevä

Markko Jaakkola

Arto Kumpulainen

Laura Savela

Ilkka Hiirsalmi

Pekka Koivukannas

Pietikäinen Reijo

Markku Kyttsönen

Nissinen Vilho

Hannu Royal Cliff Gardens Condominium Lätti

A method for modernizing a existing multiroll calender, having at least one stack of calender rolls (), each stack comprising at least two calender rolls () and at least one of the calender rolls being a smooth-surfaced press-roll (). In an existing multiroll calender the smooth-surfaced press roll () is replaced by an ultra thermo roll that is a thermo roll with a diameter substantially the same or less than the thermo roll to be replaced, so that the surface temperature of the ultra thermo roll when heated is at least 110&#xb0; C., and has at least 10&#xb0; C. higher than the surface temperature of the existing roll with the same heating fluid temperature and having flow channels arranged in such a way that vibration excitation is minimized, by being arranged to form a spiral geometry in the mantle.

Method for modernizing a multiroll calender, in particular for modernizing a supercalender and a modernized multiroll calender, in particular a modernized supercalender

A processing device and method applying the same for processing a coated or uncoated fibrous web is provided. The device comprises a belt configured to extend around a guiding element, at least one counter-element being disposed outside said belt to provide a contact area with the belt, such that the belt and the counter-element establish therebetween a web processing zone for passing a web to be processed therethrough. The processing zone length is defined by the disposition of the belt's guiding element and/or by the configuration of the counter-elements. The contact pressure applied to a web in the processing zone is within the range of between about 0.01 MPa and about 200 MPa.

Processing device and method of operating the device for processing a coated or uncoated fibrous web

A calender includes at least two roll stacks which each have at least three rolls, and in each of which the web path of a fibrous web meanders between each roll pair of the stack. In order to produce a selectable fibrous web grade, the web is passed between each roll pair of each stack, so that at least one roll pair in at least one stack is in nip contact to form a nip that calenders the web. The web runs between each roll pair of each roll stack and, in order to produce a selectable fibrous web grade, a selectable number of rolls is in nip contact with each other in each stack to form at least one nip that calenders the fibrous web.

Method for calendering a fibrous web and a calender

The moisture profile and/or moisture gradient of a paper web of at least SC quality paper is controlled in a paper machine comprising a calender () which has at least two roll stacks (), one stack has at least three rolls and another has at least five rolls. The web is moisturized to a desired pre-moisture content Mby a pre-moisturizer () before the calender. At least one intermediate moisturizer () is arranged between two roll stacks moisturizes the web to a desired intermediate moisture content Mbefore the last roll stack (), in which the web is dried to a desired final moisture value M. For continuously controlling and optimizing the moisture profile and/or moisture gradient of the web, the pre-moisturizing Wof the web is controlled by a pre-moisturizer () control parameter which corresponds to the final moisture value Mof the web.

Method, system and calendar for controlling the moisture profile and/or moisture gradient of a paper web, and a web

A paper web moistened in a paper machine and reeled on a machine reel is calendered in a multinip calender arranged apart from the paper machine, whose roll assembly is formed of a first set of rolls and a second set of rolls in the travel direction of the paper web. At least one surface of the paper web is moistened with at least one pre-moisturizer, whereafter the paper web is guided to the first calender nip of the first set of rolls and one surface of the paper web is moistened with at least one intermediate moisturizer, whereafter the paper web is guided to the first calender nip of the second set of rolls, wherein a paper web having a roughness of 1.0-1.1 &#x3bc;m and/or gloss of 54-57% or 56-60% is produced as a result of calendering.

Method and apparatus for producing calendered paper

A method and arrangement for computing and regulating distribution of linear load in a multi-nip calender. A material web is passed through the nips in a set of rolls including a variable-crown upper roll, a variable-crown lower roll and intermediate rolls positioned between the upper and lower rolls. The rolls in the set of rolls are supported so that, when the nips are closed, the bending lines of the rolls are curved downwards. When computing and regulating the linear loads, one or more of the physical properties affecting the bending of each intermediate roll under load, such as bending rigidity, mass, shape, and material properties, are taken into account. The ratio of the linear loads applied to the intermediate rolls, the weight of the rolls per se, and/or the support forces applied to the rolls are regulated so that the set of rolls is in a state of equilibrium and a predetermined state of deflection.

Method and arrangement for computing and regulating the distribution of a linear load in a multi-nip calender and a multi-nip calender

An arrangement in tail threading in a multinip calender of a paper machine comprises rolls that form nips, extraction rolls as well as tail threading apparatus for guiding the tail to be transferred during tail threading through the multinip calender. The arrangement includes a holding point adapted prior to the last nip and a cutting device. The arrangement further includes a support device adapted at the holding point for supporting the tail during cutting.

Arrangement in tail threading in a multinip calender of a paper machine

In a paper/board or finishing/converting machine, a calender () comprises a number of rolls () formed into a roll stack, and a number of lift-out rolls (), which are arranged in such a way that the web (W) being treated travels from one calender () nip (N) to another via a lift-out roll (). Between the calender () roll () and the lift-out roll (), the web (W) being treated is supported by means of at least one closing member () not extending through the nip (N), which closing member is formed by a belt, wire or metal wire (), which is arranged to travel via two or more guide rolls ().

Arrangement for the web threading of a multi-roll calender

The surface of a web is monitored by a fault detection system (), a machine condition monitoring system, a quality measurement system, a web moisture measurement and/or a web temperature measurement and the soiled part of the surface of the roll is detected and localized by means of a soiling monitoring apparatus (). A control system () controls a cleaning device () to remove the detected soiling. As a web (W) travels in a paper or board production or finishing process or in finishing machinery the web and/or the surface of the roll is monitored and after a detected deviation the surface thereof is momentarily spread with a liquid while machinery is running at the same time as the web (W) travels over said roll surface.

Method and equipment for cleaning and maintaining rolls

A method and an arrangement for controlling evaporation and moisture in a multinip calender () when a continuous fibrous web (W) is calendered in calendering nips (_) placed one after the other before the fibrous web is wound on a reel-up/winder (). With a view to making the net evaporation from and the final moisture content of the web (W) constant when the running situations in the calender () change, the web is passed in the calender from the outlet of at least one nip into an air-float chamber () of the turning airborne type.

Method and arrangement for controlling moisture in a multiroll calender

A method for controlling the temperature of a heated roll in a calender is provided. The calender comprises at least one heated roll or thermoroll and at least one backing roll, between which is formed a nip through which the material web is conveyed. To the heated roll is supplied internal thermal power by internal heating means of the roll, and external thermal power by external heating means of the roll. Before changing the heated roll, internal thermal power is minimized within a specific period by control means provided in conjunction with the internal heating means; external thermal power is maximized within a specific period by control means provided in conjunction with the external heating means; and the surface temperature of and/or the thermal power released by the heated roll, which corresponds to the surface temperature and/or thermal power desired for the grade of the material web, is maintained within a specific period. The present invention further provides a method for changing the material web grade to another grade.

Method for controlling the temperature of a heated roll in a calender

A multi-roll calender for controlling the moisture gradient of a fibrous web and for enabling the manufacture of high quality paper grades, such as WFC, LWC-roto and SC-A by on- and off-line calendering. An on- or off-line multi-roll calender formed of separate sets of rolls is used for calendering, and the fibrous web (W) is subjected to intermediate moistening between the sets of rolls (A, B).

Multi-roll calender

A supercalender for calendering a paper web and a calendering arrangement for producing matte-quality paper web has a multiple-nip calender in which at least one of the calendering nips of the multiple-nip calender is an extended nip (N ) formed between a polymer roll ( ) and either a shoe roll ( ) or a calendering belt.

Multiple-nip calender and calendering arrangement

A paper or board web (W) is calendered in at least one calendering nip (N N ), and the web (W) is moisturized before calendering. The web (W) is moisturized by means of liquid moisturization ( ) very close before at least one calendering nip (N N ). A calender for calendering a paper or board web has at least one liquid moisturizing calendering nip (N N ) and at least one device ( ) for moisturizing the web (W) is placed very close before at least one calendering nip (N N ).

Method and device for moisturization of a paper or board web in calendering

A method for a multi-roll calender and a multi-roll calender for controlling the moisture gradient of a fibrous web and for enabling the manufacture of high quality paper grades, such as WFC, LWC-roto and SC-A by on- and off-line calendering. An on- or off-line multi-roll calender formed of separate sets of rolls is used for calendering, and the fibrous web (W) is subjected to intermediate moistening between the sets of rolls (A, B).

Method for a multi-roll calender as well as a multi-roll calender

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Järvenpää, Finland

Pekka Linnonmaa