Metso Paper Inc.

Valmet Corporation

Pentti Rautiainen

Vilho Nissinen

Markku Kyytsönen

Harri Kuosa

Pasi Ahonen

Juha S Kinnunen

Kaisa Putkisto

Juha Maijala

Johan Grön

Mari Taipale

Johan Gr&ouml;n

Chris Bertram

Stefan Fors

Timo Eskola

A film is formed on a planar surface by applying a granular layer on the planar surface by using electrostatic forces, and then finishing the granular layer to form the film. A converting line may be rebuilt to have devices employing this method. A multilayer sheet-like product comprising a film layer may be produced.

Method for forming a film, by using electrostatic forces

A system for maintaining calender rolls of a paper machine clean when producing high-gloss paper or coated paper, such as LWC or MWC. To prevent a coating agent, such as coating dye, from adhering onto and soiling a smooth surface of a calender roll, with an overheating phenomenon, the system has a second measurement station () provided with measuring and indicator means for producing an output indicating soiledness of the web (W) or a humidity profile. When the output of the second measurement station () indicates excessive soiledness or an uneven humidity profile, the system performs at least one of: cleaning the surface of the smooth-surfaced calender roll; changing the nip load in the calender (); making a correction adjustment of the CD-directional humidity profile of the web (W); cutting the web (W) and conducting it into the pulper; and/or changing the running speed of the web (W).

System for keeping calender rolls of a paper machine clean

A method for manufacturing a paper or board web in which stock is fed from a headbox ( ) to a wire section ( ), in which water is removed from the web (W) and from which the web (W) is passed to a press section ( ), in which water is pressed out of the web (W) and after which the web (W) is dried in a dryer section ( ) and reeled by means of a reel-up ( ). According to the invention, additives, fillers and/or fines are fed into the stock of the surface layers of the web (W) in order to reduce the pore size distribution of the web in the surface layers so as to substantially correspond to a precoated web. The invention also relates to a paper or board machine which is characterized in that it is structured for enabling the feeding of additives, fillers and/or fines into a fiber stock such that an uncoated web substantially corresponds in its properties to a precoated web.

Method for manufacturing a paper or board web and a paper or board machine

Fine paper is manufactured in a paper machine by feeding stock into a headbox ( ) from a short circulation the stock volume of which has been minimized, water is removed from the paper web (W) most advantageously in a gap former ( ), in the press section ( ) water is pressed out of the paper web (W) in an extended nip press ( ), in the dryer section ( ) impingement drying ( ) is employed for the drying of the paper web (W), the paper web (W) is pre-calendered in a calender ( ) employing low nip loads, both surfaces of the paper web (W) are precoated at the same time, after precoating ( ) the paper web (W) is dried by means of contact-free drying ( ), the paper web (W) is coated in an on-line coating station/stations ( ), after which the paper web (W) is at least partly dried in a drying section/sections ( ) by means of contact-free drying of the paper web (W), and the paper web (W) is calendered in an on-line calender ( ) while the linear load in each nip is regulated separately.

Method for the manufacture of paper, and paper machine line

When a new roll is changed in an off-machine coating line into the unwinder, problems are encountered in matching the tension of the web received from the expiring roll to that to be paid off from the new roll. Differences in web tension cause web breaks during roll change. To avoid this, the web is supported at the unwinder, and subsequently, at the following dryer cylinder group by a support felt that equalizes differences in web tension. The web received from the first roll is spliced to the tail of a second, full roll by pressing the web received from the first roll against the web of the second roll via the support felt by a splicing roll. Next, the web is fed supported by the felt to a dryer cylinder group including VAC and steam cylinders where the damp web is dried for subsequent coating.

Assembly for the unwinder end of an off-machine paper web handling line

Growing community of inventors

Järvenpää, Finland

Pentti Rautiainen