Method of making a stratified paper
US6902650B2 · kind B2 · utility
26Cited by
9References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2003 |
| Grant date | Jun 7, 2005 |
| Priority date | — |
| Expiry date | Nov 3, 2023 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F11/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a method making stratified paper by redistributing the pulp suspension inside the headbox nozzle using acoustic radiation waves. Acoustic radiation forces fractionate fibers based on fiber radius. The acoustic radiation waves separate the fibers by pushing the coarse and longer fibers to the inner area while fines and smaller fibers remain in the outer area. This has a similar effect of multi-layer stratification headbox, and provides paper with a smoother surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.