Method and intermediate for the production of highly refined or microfibrillated cellulose
US10900169B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2013 |
| Grant date | Jan 26, 2021 |
| Priority date | — |
| Expiry date | Jul 13, 2034 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/18
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for the production of highly refined or microfibrillated cellulose (MFC), comprising the steps of treating cellulosic fibres to remove at least a major part of the primary wall of the fibres, drying the treated fibres, rewetting the treated fibres, and disintegrating the wetted fibres by mechanical means to obtain the final product. Dried cellulosic pulp is produced as an intermediate product of the method, having an average fibre length of at least 0.4 mm, while less than 50% of the primary wall material of natural untreated fibres is left in the intermediate product. Instead of transporting large amounts of dilute MFC dispersion the invention enables transport of the dry intermediate product to the MFC end user, who would complete the process by turning the intermediate product to final MFC by use of standard disintegrating devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.