Abstract: The method for preparing nanofibrillar cellulose comprises disintegrating (DIS1) fibrous cellulosic raw material to a first disintegration level to a half-fabricate, transporting (TRANS) the half-fabricate in the first disintegration level in concentrated form to a destination, and at the destination, disintegrating (DIS2) the half-fabricate from the first disintegration level to the second disintegration level to nanofibrillar cellulose.

Abstract: The present application relates to a medical hydrogel comprising nanofibrillar cellulose, wherein the hydrogel has a viscosity in the range of 2500-9000 Pa·s and a water retention value in the range of 30-100 g/g. The present application also relates to a method for preparing the medical hydrogel The present application relates to the medical hydrogel for use for treating wounds.

Abstract: The invention relates to a method for reducing the viscosity of a nanofibrillar cellulose hydrogel, wherein the method comprises mixing a nanofibrillar cellulose hydrogel with an aqueous growth medium for cell culture, wherein the aqueous growth medium contains one or more salts and optionally one or more sugars, using shearing forces so that a homogeneous dispersion is formed. The invention further relates to a dispersion comprising a nanofibrillar cellulose hydrogel and an aqueous growth medium for cell culture and to a use of an aqueous growth medium.

Abstract: Method for making modified cellulose products comprises —processing cellulose pulp to modified cellulose pulp at a manufacturing location to increase the susceptibility of fibers to disintegration, —setting the modified cellulose pulp to a suitable dry matter content, and —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.

Abstract: The present invention concerns a process for removing ions from waste water, which process comprises providing plant-derived cationic nanofibrillar cellulose, carrying out a purification treatment comprising sorption of ions contained in the waste water to the plant-derived cationic nanofibrillar cellulose, separating used plant-derived cationic nanofibrillar cellulose from the waste water, and recovering treated waste water. The invention also concerns use of plant-derived cationic nanofibrillar cellulose in water treatment for removing charged contaminants.

Abstract: The present invention concerns a process for removing metal ions from waste water, which process comprises providing plant-derived anionic nanofibrillar cellulose, carrying out a purification treatment comprising sorption of positively charged metal ions contained in the waste water to said nanofibrillar cellulose, separating used plant-derived anionic nanofibrillar cellulose from the waste water, and recovering treated waste water. The invention also concerns use of plant-derived anionic nanofibrillar cellulose for removing metal ions from waste water.

Abstract: A catalyst is recovered from an aqueous reaction mixture comprising heterocyclic nitroxyl catalyst and oxidized cellulose, by: —separating the oxidized cellulose from the reaction mixture, —contacting the reaction mixture with solid hydrophobic adsorbent particles with particle sizes below 350, preferably below 200 ?m, more preferably below 100 ?m, said particles being silica particles provided with functionalized hydrophobicity, —adsorbing the catalyst to the hydrophobic adsorbent particles, and —eluting the catalyst from the adsorbent particles with an organic solvent.

Abstract: One embodiment provides a method for monitoring the quality of nanofibrillar cellulose produced in a process comprising disintegrating fibers of cellulose pulp, the method comprising measuring in real-time optically the turbidity of a dispersion containing nanofibrillar cellulose obtained from a disintegrating process, and determining the quality of said produced nanofibrillar cellulose using a correlation between the measured turbidity and said quality of the produced nanofibrillar cellulose, wherein lowered turbidity indicates increased quality of the nanofibrillar cellulose. One embodiment provides a device for monitoring the quality of nanofibrillar cellulose produced in a process comprising disintegrating fibers of cellulose pulp, arranged to carry out said method.

Abstract: The invention relates to a method for obtaining a release liner and to release liner comprising a primer layer and a cellulose based support layer, the primer layer comprising an organic compound having one or more functional vinylic groups, the organic compound comprising an acetal connecting a first moiety and a second moiety, the first moiety comprising nanofibrillar cellulose having functional hydroxyl groups and the second moiety comprising an organic fragment, the organic fragment comprising at least one functional vinylic group.

Abstract: A process for producing a nanofibrillar cellulose hydrogel comprises obtaining bleached cellulose pulp fibers and providing an aqueous suspension thereof; and subjecting the cellulose pulp fibers in the aqueous suspension to at least 2 cycles of high pressure mechanical disintegration to obtain a nanofibrillar cellulose hydrogel and thereby reducing the number of viable microorganisms present in the suspension by a factor of at least 102; wherein all steps of the process after obtaining the bleached cellulose pulp fibers are performed under conditions of ISO 8 of ISO 14644-1 cleanroom standards or stricter. A nanofibrillar cellulose hydrogel, a system for producing the same and the use of a disintegrating apparatus are also disclosed.

Abstract: A method for catalytic oxidation of cellulose using a heterocyclic nitroxyl radical as catalyst and main oxidant acting as oxygen source comprises, before the catalytic oxidation of the cellulose, pretreatment of the cellulose—in an alkaline pretreatment step, where the cellulose is treated in alkaline solution having hydroxide concentration of above 0.3 M, and—in a washing step, where the cellulose treated in the alkaline solution is washed to lower the pH.

Abstract: The present invention relates to nanofibrillar cellulose. Furthermore, the invention relates to a method for the manufacture of nanofibrillar cellulose, and to a nanofibrillar cellulose obtainable by said method. The invention also relates to uses of the nanofibrillar cellulose.

Abstract: A method for fibrillation of cellulose includes the following steps: introducing fiber pulp of anionic cellulose at a consistency of 1 to 4% into a homogenizer, and homogenizing fiber pulp in the homogenizer at a pressure of 200 to 1000 bar, advantageously 300 to 650 bar, and by using 2 to 4 passes through for the same fiber pulp under these conditions, and after passes through, taking pulp from the homogenizer, which pulp has been fibrillated by homogenization to a degree than can be expressed as Brookfield viscosity exceeding 10,000 mPa·s (consistency 0.8%, 10 rpm).

Abstract: The invention relates to a method for reducing the viscosity of a nanofibrillar cellulose hydrogel, wherein the method comprises mixing a nanofibrillar cellulose hydrogel with an aqueous growth medium for cell culture, wherein the aqueous growth medium contains one or more salts and optionally one or more sugars, using shearing forces so that a homogeneous dispersion is formed. The invention further relates to a dispersion comprising a nanofibrillar cellulose hydrogel and an aqueous growth medium for cell culture and to a use of an aqueous growth medium.

Abstract: A method for controlling the catalytic oxidation of cellulose includes using a heterocyclic nitroxyl compound as catalyst oxidizing cellulose in a reaction mixture comprising liquid medium, the catalyst and hypochlorite as main oxidant analyzing one or more oxidative chlorine species dependent on the hypochlorite concentration of the reaction mixture on line in the reaction mixture or in a gas composition which is in contact with the reaction mixture; and controlling supply of hypochlorite to the reaction mixture on the basis of the analysis.

Abstract: The invention relates to a method for modifying nanofibrillar cellulose composition, comprising—preparing fibrous dispersion of ionically charged nanofibrillar cellulose (NFC), and—applying heat treatment at a temperature of at least 90° C. to the fibrous dispersion until the viscosity of NFC starts to decrease. The viscosity of the heat-treated NFC is reversible by applying shear forces to the NFC.

Abstract: In a method for preparing nanofibrillar cellulose, fibrous dispersion of ionically charged cellulose is repeatedly passed through a mechanical process of disrupting fibers into fibrils until the viscosity starts to decrease. The number average diameter of the nanofibrillar cellulose after the mechanical process is in the range of 2-10 nm, and the zero-shear viscosity is below 10 Pa·s, preferably below 1 Pa·s, when measured in the concentration of 0.5 wt-%. The nanofibrillated cellulose is low aspect ratio nanofibrillated cellulose (NFC-L).

Abstract: In a method for preparing nanofibrillar cellulose, fibrous dispersion of ionically charged cellulose is repeatedly passed through a mechanical process of disrupting fibers into fibrils until the viscosity starts to decrease. The number average diameter of the nanofibrillar cellulose after the mechanical process is in the range of 2-10 nm, and the zero-shear viscosity is below 10 Pa·s, preferably below 1 Pa·s, when measured in the concentration of 0.5 wt-%. The nanofibrillated cellulose is low aspect ratio nanofibrillated cellulose (NFC-L).

Abstract: In a method for producing nanofibril cellulose, cellulose based fiber material, in which internal bonds in the cellulose fiber have been weakened by chemical modification, are supplied, for separating fibrils, through several counter-rotating rotors outwards in the radial direction with respect to the rotation axis of the rotors in such a way that the material is repeatedly subjected to shearing and impacting forces by the effect of the blades of the different counter-rotating rotors, whereby it is simultaneously fibrillated.

Abstract: The invention relates to pretreating of native cellulose pulp in the manufacture of nanofibrillated cellulose, and to a nanofibrillated cellulose product obtainable by the method.