Process of making paper and paperboard products
US11846072B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2021 |
| Grant date | Dec 19, 2023 |
| Priority date | — |
| Expiry date | Oct 26, 2041 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention is directed to products, such as paper and paperboard products, comprising a substrate containing a recycled cellulose-containing material and top ply comprising one or more inorganic particulate material; to methods of making such paper and paperboard products, and associated uses of such paper and paperboard products. The microfibrillated cellulose and inorganic particulate material are applied at a stage when the substrate comprising a wet web of pulp is in the process of being formed on the wire of a papermaking machine, thereby avoiding the additional cost of more extensive equipment and machinery as well as in separate drying of a coating. The microfibrillated cellulose facilitates the application of inorganic particulate onto the surface of a wet paper or paperboard substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.