Paper and methods of making paper
US-9212453-B2 · Dec 15, 2015 · US
Method for improving strength and retention, and paper product
US9399838B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9399838-B2 |
| Application number | US-201213980088-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 19, 2012 |
| Priority date | Jan 20, 2011 |
| Publication date | Jul 26, 2016 |
| Grant date | Jul 26, 2016 |
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Abstract
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The invention relates to a method for improving strength and retention in the manufacture of paper. According to the invention, a composition containing microfibrillated cellulose is provided in a fiber suspension, and from 0.1 to 10 w-% of microfibrillated cellulose by mass of the fiber suspension is added to improve the strength and retention of the product to be formed. In addition, the invention relates to a corresponding paper product.
First claim
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The invention claimed is: 1. A method for improving strength and retention of a product in papermaking comprising adding a composition containing anionically modified microfibrillated cellulose and an anionic polyelectrolyte to a fiber suspension, wherein the fiber suspension comprises one or more cationic fillers, and wherein from 1 to 10 w-% of the anionically modified microfibrillated cellulose by mass of the fiber suspension is added to the fiber suspension to improve the strength and retention of the product to be formed. 2. The method according to claim 1 , wherein cellulose or microfibril bundles consisting of microfibrils are modified and microfibrillated to form anionically modified microfibrillated cellulose. 3. The method according to claim 1 , wherein the composition contains a component containing microfibrillated cellulose, and a filler. 4. The method according to claim 1 , wherein the composition contains a component containing microfibrillated cellulose, and fiber-based solid material. 5. The method according to claim 1 , wherein the composition containing microfibrillated cellulose is added to a fiber suspension including fines. 6. The method according to claim 1 , wherein inorganic nanoand/or microparticles are added to the composition containing microfibrillated cellulose. 7. The method according to claim 1 , wherein from 1 to 5 w-% of microfibrillated cellulose by mass of the fiber suspension is added to the fiber suspension. 8. The method according to claim 1 , wherein at least part of retention chemicals and/or strength chemicals is replaced by the composition containing microfibrillated cellulose. 9. The method according to claim 1 , wherein a composition containing cationic microfibrillated cellulose is added to the fiber suspension. 10. The method of claim 1 , wherein the product is paper. 11. The method of claim 1 , wherein the product is a product containing microfibrillated cellulose. 12. The method according to claim 1 , wherein the composition containing microfibrillated cellulose further includes AKD or ASA sizing agent. 13. A method for manufacturing a modified fiber suspension by adding a composition containing anionically modified microfibrillated cellulose and an anionic polyelectrolyte to a fiber suspension, wherein the fiber suspension comprises one or more cationic fillers, and wherein from 1 to 10 w-% of the anionically modified microfibrillated cellulose by mass of the fiber suspension is added to the fiber suspension to improve strength and retention of a product to be formed from the modified fiber suspension. 14. A method for improving strength and retention of a product in papermaking comprising adding a composition containing anionically modified microfibrillated cellulose and a cationic microfibrillated cellulose to a fiber suspension, wherein the fiber suspension comprises one or more cationic fillers, and wherein from 1 to 10 w-% of the anionically modified microfibrillated cellulose by mass of the fiber suspension is added to the fiber suspension to improve the strength and retention of the product to be formed. 15. The method of claim 14 , wherein the composition containing anionically modified microfibrillated cellulose and cationic microfibrillated cellulose also contains a cationic polyelectrolyte.
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- What does patent US9399838B2 cover?
- The invention relates to a method for improving strength and retention in the manufacture of paper. According to the invention, a composition containing microfibrillated cellulose is provided in a fiber suspension, and from 0.1 to 10 w-% of microfibrillated cellulose by mass of the fiber suspension is added to improve the strength and retention of the product to be formed. In addition, the inve…
- Who is the assignee on this patent?
- Laine Janne, Korhonen Markus, Merta Juha, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification D21H21/18. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Jul 26 2016 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).