Papermaking system and method
US11015295B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Nov 12, 2019 |
| Grant date | May 25, 2021 |
| Priority date | — |
| Expiry date | Nov 12, 2039 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/70
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of making paper is described. The method includes providing a cellulosic fibrous material, the cellulosic fibrous material comprising a plurality of elongated fibers having a fiber wall surrounding a hollow interior, the fibrous material having moisture content. The method also includes adding calcium bicarbonate solution to the cellulosic fibrous material to form a pulp mixture, the calcium bicarbonate solution containing up to the saturation level of about 16% solids of calcium bicarbonate, the resulting pulp mixture having between 0.1% to 65% total solids by weight. Further, the method includes refining the pulp mixture such that at least some of the calcium ions become associated with the reactive sites in the fiber walls. Further still, the method includes forming a web from the pulp mixture and wet pressing the web.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.