High yield fiber sheets
US4247362A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1979 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | May 21, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H23/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Wet-laid sheets of softwood high yield fibers in combination with hardwood high yield fibers. The sheets, which are strong enough to be handled by commercial equipment, are formed on conventional papermaking machines using a furnish comprising a major proportion of softwood high yield fibers in admixture with a minor proportion of hardwood high yield fibers. The hardwood high yield fibers are specially prepared by a procedure comprising treating hardwood with relatively high levels of chemicals under relative stringent conditions and defibrating the treated hardwood with relatively high levels of power input. Airfelts made from these sheets exhibit low wet densities. Processes for making the sheets and the airfelts are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.