Upm-kymmene Corporation

Taisto Tienvieri

Markus Nuopponen

Juha Tamper

Isko Kajanto

Markku Gummerus

Tapani Vuorinen

Sami Saarela

Timo Pääkkönen

Tarja Sinkko

Tero Ojala

Maria Alajaaski

Timo Paakkonen

Maria ALAJÄÄSKI

Vesa Suojanen

Ari Latomaa

In a method for producing nanofibrillar cellulose, cellulose based fiber material in dispersion is processed for separating fibrils. The method includes a first step where the fiber material is supplied to a disperser, where it flows through several counter-rotating rotors in such a way that the material is repeatedly subjected to shear and impact forces by the effect of the different counter-rotating rotors, and a second step, where the fiber material obtained from the first step is supplied to a homogenizer, where it is subjected to homogenization by the effect of pressure.

Method and a device for producing nanofibrillar cellulose

Cellulose is oxidized catalytically using a heterocyclic nitroxyl radical as catalyst, main oxidant acting as oxygen source, and an activator of the heterocyclic nitroxyl radical. The oxidation is performed in a reaction medium which is at medium consistency of cellulosic pulp, which is above 6%, more preferably equal to or higher than 8%, and most preferably in the range of 8-12%. The reaction medium is mixed in a reactor through circulation of the reaction medium back to the reactor.

Method for catalytic oxidation of cellulose and method for making a cellulose product

Method for making modified cellulose products comprises &#x2014;processing cellulose pulp to modified cellulose pulp at a manufacturing location to increase the susceptibility of fibers to disintegration, &#x2014;setting the modified cellulose pulp to a suitable dry matter content, and &#x2014;transporting the modified cellulose pulp at set dry matter content to a location of use, where the modified cellulose pulp is disintegrated to nanofibrillar cellulose.

Method for making modified cellulose products

A method for making nanofibrillar cellulose includes mixing anionized or cationized cellulose fibers and cellulose pulp to a mixture including at least 1% and below 90 wt-% cellulose pulp based on dry weight, and subjecting the mixture to a refiner stage where the anionized or cationized cellulose fibers are at least partly reduced to nanofibrillar cellulose and the cellulose pulp acts as auxiliary pulp, and obtaining a mixture of nanofibrillar cellulose and cellulose pulp from the refining stage. The mixture can be used for making paper by adding it to base pulp.

Method for making nanofibrillar cellulose and for making a paper product

The object of the present invention is a method for making mechanical pulp, such as thermomechanical or chemi-thermomechanical stock. The mechanical pulp is used as a raw material for printing paper, and its freeness value is 30-70 ml CSF. The stock refined by the method is screened in several stages to form accept and reject stock portions. The wood raw material is refined at the first stage of refining at a superatmospheric pressure of over 400 kPa to form a stock that has a freeness value of 250-700 ml CSF.

Raw material for printing paper, a method for producing said raw material and a printing paper

The object of the present invention is a method for making mechanical pulp, such as thermomechanical or chemi-thermomechanical stock. The mechanical pulp is utilised as a raw material for printing paper, and its freeness value is 30&mdash;70 ml CSF. According to the method, the refined stock is screened in several stages into accept and reject stock portions. The stock is screened at a consistency of not less than 10%.

Growing community of inventors

Vantaa, Finland

Taisto Tienvieri