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US 5,124,029 AGranted
Method of and device for fractionating suspensions
AssigneeAB Celleco
InventorsRoland Fjallstrom, Rune Frykhult
Life of this patent
Estimating the term…
Abstract
A device for fractionating pulp suspensions has a series of vertical filter sheets attached to a horizontal shaft. Suspension is sprayed against the sheets to effect a separation of coarse and fine solids. Cleansing liquid is also sprayed against the sheets to keep the filter holes open and the fabric sheets are movable with respect to the sprays.
Claims21
A device for fractionating suspensions, such as fiber pulp, comprising:
- a housing,
- a substantially horizontal shaft extending in the housing and rotatably journaled in the housing,
- at least one pair of substantially vertical filter sheets having screen holes and attached to the shaft substantially transverse to the shaft,
- spray means adapted to spray suspension against the filter sheets, to separate the suspension into a fine fraction, which passes through the screen holes of the filter sheets and which contains fine particles, and a coarse fraction, which does not pass through said screen holes and which contains coarse particles and some fine particles, said spray means being positioned relative to the filter sheets, such that one of said fine and coarse fractions is formed between the filter sheets of said pair of filter sheets, while the other fraction is formed outside said pair of filter sheets,
- additional spray means for spraying cleansing liquid against the filter sheets, for cleansing the screen holes of the filter sheets,
- means for displacing the filter sheets relative to said additional spray means, such that said additional spray means spray cleansing liquid against the screen holes which have been sprayed with suspension,
- first outlet means for discharging the fine fraction from the housing, and
- second outlet means for discharging the coarse fraction from the housing.
5 more elements
A device for fractionating suspensions comprising:
- a housing,
- a rotatable, substantially horizontal shaft extending within the housing,
- a plurality of substantially vertical filter sheets attached substantially transverse to the shaft,
- suspension spray means, placed between two filter sheets along the shaft, adapted to spray suspension against the surfaces of the filter sheets facing the suspension spray means, such that a coarse fraction develops on the side of the filter sheets against which suspension is sprayed, and a fine fraction develops on the side of the filter sheets against which suspension is not sprayed,
- cleansing spray means adapted to spray a cleansing liquid against at least one surface of the filter sheets, to cleanse the coarse fraction from the filter sheets,
- outlets into which the coarse and fine fractions separately are drained from the housing.
3 more elements
Dependencies are inferred from the claim text.