Method for bleaching of cellulosic pulp
US3976538A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1976 |
| Grant date | Aug 24, 1976 |
| Priority date | — |
| Expiry date | Feb 24, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D1/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A first portion of bleaching liquid is passed through cellulosic pulp in a bleaching zone at a first level with respect to the pulp feed direction and withdrawn through transversely spaced strainer means located at about said first level so that the passage of the first portion of bleaching liquid through the pulp is in a direction transverse to the feed direction of the pulp and a second portion of bleaching liquid is passed through said cellulosic pulp at a second level with respect to the pulp feed direction and withdrawn through transversely spaced strainer means located at about the second level so that the passage of the second portion of bleaching liquid through the pulp is in a direction transverse to the feed direction of the pulp and opposite from the transverse direction through said first level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.