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Method and an apparatus for producing nanocellulose
US8945346B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8945346-B2 |
| Application number | US-201113977794-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 30, 2011 |
| Priority date | Dec 31, 2010 |
| Publication date | Feb 3, 2015 |
| Grant date | Feb 3, 2015 |
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Abstract
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Described herein is nanocellulose produced by introducing a mixture of cellulose based fiber raw material and water through a refining gap, having a width smaller than 0.1 mm. In the refining gap, the fiber raw material is subjected to processing forces varying in the direction of introducing said mixture, by means of refining zones provided in the gap one after each other in the feeding direction, whereby the refining surfaces differ in surface patterning and/or surface roughness. The mixture of fiber raw material and water is guided past the refining surfaces in the feeding direction to different locations in the refining zone by by-pass channels provided in the stator. The width of the refining gap is maintained by the combined effect of the feeding pressure of the mixture of fiber raw material and water fed into the refining gap and the axial force of the rotor.
First claim
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The invention claimed is: 1. A method for producing nanocellulose, wherein cellulose based fiber raw material is processed mechanically to separate microfibrils, wherein the mechanical processing is performed by feeding a mixture of cellulose based fiber raw material and water at a consistency ranging from 1.5 to 4.5% at a feeding pressure through a ring-shaped refining gap having a width smaller than 0.1 mm and formed between refining surfaces performing a relative movement in th…
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- What does patent US8945346B2 cover?
- Described herein is nanocellulose produced by introducing a mixture of cellulose based fiber raw material and water through a refining gap, having a width smaller than 0.1 mm. In the refining gap, the fiber raw material is subjected to processing forces varying in the direction of introducing said mixture, by means of refining zones provided in the gap one after each other in the feeding direct…
- Who is the assignee on this patent?
- Bjoerkqvist Tomas, Koskinen Timo, Nuopponen Markus, and 3 more
- What technology area does this patent fall under?
- Primary CPC classification D21B1/12. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Feb 03 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).