System for presteaming wood chips at or near atmospheric...

Details System for presteaming wood chips at or near atmospheric... System for presteaming wood chips at or near atmospheric...

D - Textiles, Paper

21

C

9/70, 92/57.3

D21C 1/02 (2006.01)

Patent

CA 1107920

ABSTRACT OF THE DISCLOSURE 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 main- taining 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 and packs the chips to form an isolation seal at the chips inlet into the vessel. - 2 -

271913

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