Outokumpu Oyj

Upm-kymmene Corporation

Pentti Pirkonen

Timo Tuori

Hannu Mursunen

Jorma Ihalainen

Hannu Sekki

Markus Nuopponen

Martina Lille

Annikki Vehniäinen

A method for concentrating fibril cellulose including subjecting aqueous fibril cellulose at a concentration of not higher than 5% to pressure filtration where water is removed from the fibril cellulose by applying pressure to the aqueous fibril cellulose, and continuing the pressure filtration continued to an end point where over 50% of the water initially present is removed from the fibril cellulose. The pressure filtration is performed at a temperature of 30&#xb0; C. or higher.

Method for concentrating fibril cellulose and fibril cellulose product

The invention relates to a method and apparatus for cleaning the filter surface (,) of a filter medium in a suction drier. According to the invention, in order to mark the surface to be cleaned, in contact with the surface to be cleaned there is set a sealing surface (,) that forms an essentially closed space for the surface to be cleaned, and that into said closed space, there is conducted cleaning liquid (,) in order to carry out the cleaning.

Apparatus for cleaning a filter surface

Combined ultrasonic cleaning and washing of filter disks

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Jyväskylä, Finland

Pentti Pirkonen