Manufacture of paper and paperboard containing wood free pulp
US9765482B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 2014 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | Oct 3, 2034 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a process of manufacturing paper or paperboard which comprises providing (a) a mechanical pulp and (b) a wood free pulp, combining (a) the mechanical pulp and (b) the wood free pulp to form a mixed pulp comprising no more than 20% by total dry weight of fiber of the mechanical pulp, flowing the mixed pulp as a medium consistency stock and combining the medium consistency stock with dilution water to form a low consistency stock, draining the low consistency stock through a wire or mesh to form a sheet of paper which is dried, in which additional filler and a cationic polymer are added to the mechanical pulp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.