Production of filled paper
US5501774A · kind A · utility
93Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1994 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | Jan 21, 2014 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H23/765
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Filled paper is made by providing an aqueous feed suspension containing filler and cellulosic fibre, coagulating the fibre and filler in the suspension by adding cationic coagulating agent, making an aqueous thinstock suspension by diluting a thickstock consisting of or formed from the coagulated feed suspension, adding anionic particulate material to the thinstock or to the thickstock from which the thinstock is formed, subsequently adding polymeric retention aid to the thinstock and draining the thinstock for form a sheet and drying the sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.