Device for the treatment of a fibrous suspension
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United States of America Patent
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Feb 18, 2003
Issued Date -
N/A
app pub date -
Sep 7, 2001
filing date -
Mar 9, 1999
priority date (Note) -
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Abstract
Device for the washing and dewatering a fibrous suspension, which device incorporates two hollow, circular cylindrical filter drums (1), which filter drums incorporate evacuation chambers inside the filter drums for evacuation of fluid. The filter drums rotate in opposite directions to create a pinch (2) where at least one of the said filter drums (1) is installed in a trough (7,8) which partly encloses the outer surface (3) of the filter drum and which, in the direction of rotation of the filter drum, converges towards the outer surface of the filter drum. At least one pulp inflow chamber (4) is installed at the highest point (1) of one or both of the filter drums each equipped with a trough for the introduction of pulp between the outer surfaces (3) of the filter drum and its trough (7,8) for the formation of a fibrous web. The trough (7,8) is designed to enclose the outer surface (3) of the filter drum, from the inflow chamber (4) and further round at least 230.degree. of the circumference of the outer surface, so that the said fibrous web during operation is constrained to run between the filter drum's outer surface (3) and the trough (7,8) round at least 230.degree. of the circumference of the outer surface before the fibrous web reaches the pinch (2).
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