Reciprocal movable screens in a vertically elongated vessel
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United States of America Patent
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Oct 28, 1997
Grant Date -
N/A
app pub date -
Sep 13, 1995
filing date -
Apr 5, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a vertical vessel, particularly a continuous pulp digestion vessel, wherein fiber materials suspended in liquid pass downwardly past screens through which treatment liquid is withdrawn. The screens are reciprocated vertically up and down utilizing a piston and cylinder assembly. The piston moves downwardly on the pressure from a pump and returns upwardly on the influence of the interior digester pressure during normal digester operation. The positioning of the pistons on the inside of the screens provides many advantages.
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