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AssigneeUpm-Kymmene Corporation
InventorsMarkus Nuopponen, Juha Tamper, Isko Kajanto
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In a method for producing nanofibrillar cellulose, cellulose based fibre material, in which internal bonds in cellulose fibres have been weakened by 5 preliminary modification of cellulose, is subjected to disintegration treatment in form of pulp comprising fibres and liquid. The fibre material is supplied at a consistency higher than 10 wt-%, preferably at least 15 wt-%, to a disintegration treatment where fibrils are detached from the fibre material by joint effect of repeated impacts to the fibre material by fast moving 10 successive elements and the weakened internal bonds of the cellulose fibres. The nanofibrillar cellulose is withdrawn from the disintegration treatment at dry matter which is equal or higher than the consistency of the fibre material.
A nanofibrillar cellulose product, which is in the form of moist powder containing particles formed of cellulose nanofibrils wherein a dry matter content of the moist nanofibrillar cellulose powder is between 16-60 wt-% based on the dry matter of nanofibrils, where a cellulose in a fibrous starting material is chemically modified cellulose and the median particle diameter of the nanocellulose powder by laser diffraction analysis is 100-1000 micrometers, wherein the cellulose is
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