US3581903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separator for paper pulp suspensions
Assignee: Finckh Hermann Metalltuch und Maschinenfabrik
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Filing: 1967-10-26
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Granted: 1971-06-01
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Expires: 1987-10-26
Abstract
Abstract Separator for paper pulp suspension in which the apparatus has a pressurized housing with a cylindrical screen dividing said housing into an annular outer chamber which encircles a cylindrical inner chamber into which latter by pressure means, including a pump, pulp is forced through said screen and thence out of said housing, said screen being free of round holes capable of passing large round or cubical fiber bundles and comprising a multiplicity of narrow elongated slitlike apertures in the upstream face thereof, each connecting with a wider elongated groove in the downstream face of said screen, the slits passing only thin, small fibers or particles and the apertures combining with the back pressure of foils rotating against the downstream face of the screen, with the venturi shape of the apertures and with the forward pressure of pump to successively create alternate outward jets and inward flow in said slits to free any particles jammed therein by said pumping pressure.
Inventors
- 👤 Emil Holz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:32
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/115; B01D29/31; B01D29/33; B01D29/62; B01D29/66; B01D29/666; B01D29/76; B01D29/86; B01D29/88; B01D29/90; B01D29/908; B01D29/94; B01D29/945; D; D21; D21D; D21D5/00; D21D5/02; D21D5/06; B01D2201/00; B01D2201/18; B01D2201/184; B01D2201/28; B01D2201/287
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
224 words
In a separator for paper pulp suspensions of the type having a pressurized housing with an upstanding perforated cylindrical screen dividing said housing into an annular outer chamber encircling a cylindrical inner chamber, pressure means for feeding said suspension under pressure into and around said annular outer chamber, through said screen from the outer face to the inner face thereof, and thence out of said inner chamber, said screen having a multiplicity of idenTical separator slots forming the perforations in said screen, each slot having a fine, narrow, elongated slit in the outer face of said screen widening into a coarse, wide, elongated groove on the inner face of said screen having its sides diverging from said slit, said slits being adapted to bar round or cubical particles wider than said slits, but to pass narrow particles such as fibers through said slots, and a plurality of forwardly rotating foil-shaped vanes extending along the inner face of said screen, each of said vanes having a curved surface adjacent said screen which curves toward said screen from its leading edge to decrease the distance between the surfaces of said vane and screen rearwardly from said leading edge, so that the adjacent surfaces of each vane and the screen converge rearwardly from said leading edge and create pressure outwardly through said perforations to clear said slits.
Claim 2
Dependent Claim
191 words
A paper stock separator having an annular, influent, pressure chamber separated from a cylindrical, effluent pressure chamber by an upstanding, perforated, cylindrical screen and having a pressure pump-feeding stock under predetermined pressure from said influent chamber through said screen into said effluent chamber, said separator being characterized by: separator slots forming the perforations in said screen, comprising a multiplicity of identical, equally spaced-apart, fine, narrow, elongated slits in the upstream face of said screen, each slit merging into a coarse, wide, elongated groove with sides diverging from the slit to the downstream side of said screen, and clearance blades extending along said screen and mounted to rotate at a predetermined speed within said effluent pressure chamber in a cylindrical path proximate to, but spaced from, the downstream face of said screen, the surface of each blade proximate to said screen being inclined rearwardly toward said screen from its leading edge to closely adjacent said screen, said blades cooperating with said screen to create pressure through said slots and backwash into said grooves and out of said slits to dislodge any particles of said stock from the upstream face of said screen.
Claim 3
Dependent Claim
77 words
A paper stock separator as specified in claim 13 wherein: the groove on the downstream face of each slot is at least five times wider than the slit on the upstream face of said slot and each said slot is at least 25 times the width of said groove in length, whereby if the groove is 2.5 millimeters in width, the slot is about 0.4 millimeters in width and the slot is about 60 millimeters in length.
Claim 4
Dependent Claim
80 words
A paper stock separator as specified in claim 3 wherein: each fine narrow slit in the upstream end of each slot is defined by a pair of parallel, elongated sidewalls to define a slit of rectangular configuration and predetermined depth, and each said groove in the downstream end of each said slot is defined mainly by a pair of diverging, elongated sidewalls to define a boat-shaped configuration of predetermined depth substantially greater than the depth of said parallel walled slit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |