Method of withdrawing liquid from a pair of vertically spaced annular screens
US4547264A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1981 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | May 12, 2001 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C7/14
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for selectively withdrawing liquor from digester cooking screens for controlling the temperature in continuous digesters. First and second pairs of screens, with cooperating headers, are provided, and first and second outlets spaced circumferentially around the digester are associated with each header. Each header provides a circumferential cavity free of dividing members. Within each pair of screens withdrawal is practiced so that each header is rested during each ultimate withdrawal step, and the side from which the liquor is drawn each successive withdrawal step that the same header is used is alternated. In practicing the invention, header blockage caused by deposited debris and scale is minimized and increased uniformity and improved product quality result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.