Metso Paper Inc.

Upm-kymmene Corporation

Hannu Lepomäki

Antti Poikolainen

Maarit Tukiainen

Jyrki Huovila

Ari Puurtinen

Juhana Lumiala

Esko Kukkamäki

Juan Cecchini

Mika Laitila

Juhani Sams

Petri Jetsu

Hannu Karema

Mikko Vuori

Markku Kellomäki

Jukka T Heikkinen

Petteri Soini

The invention relates to a method for manufacturing a printing paper product, in which method natural fibres are introduced into a system which includes a paper machine. In the method, calcium hydroxide and carbon dioxide are admixed to natural fibres, for precipitating calcium carbonate onto the surfaces of the natural fibres, and said printing machine is used for manufacturing a printing paper product which includes at least said natural fibres, with calcium carbonate precipitated on their surfaces, as a filler for said printing paper product. The invention also relates to a system for manufacturing a printing paper product. Further, the invention relates to a calendered printing paper product which has not been coated with a pigment.

Printing paper product, as well as a method and a system for manufacturing a printing paper product

A procedure and arrangement to control the lamella of a headbox's lip channel, when the mass flow goes in the headbox () through the lip channel (), in which case single mass flows are held separate from each other with the lamella () before the flows are united after the lamella. The lamella's dimensions, mechanical characteristics and/or dynamic characteristics are changed at least in the lamella's border area with an active structure, which is active and/or passive active tool and/or active and/or passive active material.

Method for managing lamella vibrations of a lip channel of a head box and the lamella for the lip channel of the headbox

A headbox () of a paper machine or such includes a bypass manifold (J), from which the pulp is conducted by way of pipes (. . . ) of pipe rows in a set of pipes () and an intermediate chamber (E) into a turbulence generator (), or from the bypass manifold (J) directly into the turbulence generator and by way of the pipes (. . . ) of the turbulence generator's () pipe rows into a lip cone (K) and further out from the headbox on to a formation wire. The turbulence generator () of the headbox includes a fluidization element (), wherein fluidization is carried out in one stage only and in which structure as little disturbance as possible is then caused to the fluidised flow.

Headbox of paper machine or such

A method for fluidisation of a pulp flow in the headbox of a paper machine or such. The characteristics of the pulp flow are affected in the headbox's fluidiser () in one step only, whereby the height (h) of the step is at least equal to the average fibre length, and after the fluidiser () the biggest permissible step expression in the flow channel in direction z is smaller than the average fibre length.

Method for fluidisation of pulp flow in the headbox of a paper machine or such and control equipment used in the fluidisation

In the short circulation of a paper machine, a chemicals flow (F) is fed into a fibre suspension flow in connection with a pipe expansion comprising a first pipe () and a second pipe () having a larger diameter than the first pipe, which pipes are connected to each other by means of an expansion step () perpendicular to the direction of flow. The chemicals flow (F) can be passed so as to be mixed with the fibre suspension flow either in the second pipe () in an ideal mixing zone situated after the expansion step () or in the first pipe () so close to the expansion step () that the chemicals which are added have no time to react with the fibre suspension before the flow enters the expansion step ().

Method and device for feeding chemicals into a fibre suspension

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Laukaa, Finland

Hannu Lepomäki