Method for making cellulosic fibrous structures having at least three regions distinguished by intensive properties
US5443691A · kind A · utility
74Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1993 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Jul 28, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24992
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for making a cellulosic fibrous structure such as paper. In one embodiment, the fibrous structure has high and low basis weight regions. The high basis weight region is subdivided into low density regions, so that a fibrous structure having three regions is produced. In a second embodiment, the fibrous structure has four regions. Both the high and low basis weight regions are further subdivided into high and low density regions. The process comprises applying noncoincident differential pressure to selected regions of an embryonic fibrous structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.