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US 2019/0292727 A1Published application
Method for manufacturing intermediate product for conversion into microfibrillated cellulose
AssigneeStora Enso OYJ
InventorsKaj Backfolk, Isto Heiskanen, Esa Saukkonen, Katja Lyytikäinen, Heidi Saxell
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Abstract
The present invention relates to a method for manufacturing an intermediate product that can be stored and transported and efficiently converted into microfibrillated cellulose with limited energy input at the time of conversion. More specifically, the invention involves the use of dewatered carboxymethylcellulose or carboxylated cellulose fiber having a low degree of substitution and a high amount of additives.
Claims20
A process for preparing an intermediate product suitable for subsequent conversion into microfibrillated cellulose comprising the steps of
- a) providing an aqueous suspension comprising carboxymethylcellulose or carboxylated cellulose fiber having a degree of substitution less than 0.4;
- and
- b) dewatering the suspension of step a) on a wire to achieve an intermediate product in the form of a sheet or web having at least 30% dry content wherein said suspension has a concentration of at least one additive of at least 1% by weight of the solids of the suspension.
Dependencies are inferred from the claim text.