System for presteaming wood chips at or near atmospheric pressure with minimum displacement of air
US4096027A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 1976 |
| Grant date | Jun 20, 1978 |
| Priority date | — |
| Expiry date | Feb 19, 1996 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C1/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for presteaming of wood chips and the like. The chips are treated in a vertical presteaming vessel with steam under low pressure, and removal of the air from the chips is facilitated by maintaining the presteaming vessel substantially at or near atmospheric pressure. An exhaust fan, controlled by a pressure probe in the presteaming vessel, may be provided for maintaining the pressure in the vessel. The amount of air that can enter the vessel through the chips inlet is minimized by an inclined rotating screw assembly with a partial flight which elevates the packs and chips to form an isolation seal at the chips inlet into the vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.