(57) @ The invention relates to an apparatus for fractionating fiber suspensions, said
apparatus including a chamber (22) converging towards its periphery and formed by
two annular fiber fractionating means (1, 2), preferably implemented as truncated
cones, a collection trough (4) arranged concentric to and at the periphery of the
chamber (22) for fibers retained by the fiber fractionating means (1, 2), and agitating
means (20) departing from a centrally arranged shaft (19) and rotatable therewith,
the means (20) having vanes (35) contiguous to the fiber fractionating means (1, 2),
the vanes (35) having an engagement area coacting with the fiber fractionating means.
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