Importance

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Abstract

A cylinder type paper pulp washer or thickener apparatus includes a rotatable cylinder mold with a forming wire surface. The mold rotates at least partially submerged in a vat of dilute paper pulp stock and a differential pressure across the wire surface draws stock from the vat through the cylinder mold and forms a pulp mat on the wire surface, and a plurality of disrupters are positioned within the vat and in arcuately spaced relation to the wire surface to cause a disruption of the fiber mat which obstructs the flow of the stock liquid through the wire surface and thereby provides for the reestablishment of flow. Various disrupters are shown, including a rotating non-circular bar, a doctor blade, a foil, a fluid jet, a brush, and a triangular protuberance. A plurality of such disrupters are positioned in peripherally spaced relation to cause repeated disruption and reformation of a fiber mat to increase the throughflow and washing or thickening efficiency of the apparatus.

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First Claim