Two stage counter current drum washer
US6006554A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1998 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Jun 3, 2018 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Paper fiber suspended in black liquor is washed in a rotating drum divided into a plurality of adjacent sectors. The fiber is formed into a mat on the drum, and the drum is rotated so the sectors progress through a first wash and a second wash of progressively cleaner wash fluid. Each sector has two distinct drainage systems. One drainage system drains the first wash water after it has passed through the mat, and is then blocked while that sector passes through the second wash. The cleaner second wash fluid is thus kept separate from the more contaminated first wash fluid, and is recirculated to be used in subsequent cycles as first wash fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.