US3586172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screening apparatus
Assignee: Canadian Ingersoll Rand Co Ltd
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Filing: 1968-04-16
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Granted: 1971-06-22
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Expires: 1988-04-16
Abstract
Abstract Pressure screening apparatus in which a rotor having a zoned pulse-generating wall member cooperates with a screen member provided with circumferential imperforate and perforate portions to control the velocity of the pulp flowing through the passage formed between the rotor wall member and the screen member, the screen member having a single dilution liquid opening in one of the imperforate portions thereof.
Inventors
- 👤 Douglas L G Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:55
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/023; D21D5/026
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
255 words
An apparatus for screening a mixture of fibrous material and liquid to separate the fibrous material into an accepts portion and a rejects portion, comprising an annular screen having openings adapted for accepting the accepts portion of the fibrous material and rejecting the rejects portion thereof, a rotatably driven annular wall member extending circumferentially along said screen and spaced therefrom by an annular fluid passage longitudinally between said wall member and said screen, inlet means communicating with one end of said fluid passage for supplying the mixture to said fluid passage at said one end thereof, rejects outlet means communicating with the other end of said fluid passage for discharging the rejects portion rejected by said screen openings from said other end of said fluid passage, and accepts outlet means for discharging the accepts portion accepted by said screen openings, said wall member including a plurality of distinct circumferential zones arranged longitudinally of said wall member and bounding said fluid passage, a first of said zones basically comprising a plurality of circumferential rows of depressions around said wall member, another of said zones basically comprising a plurality of circumferential rows of protrusions around said wall member and a third of said zones comprising circumferential rows of depressions therearound, said first of said zones being adjacent said one end of said fluid passage, said third of said zones being spaced longitudinally of said wall member from said first of said zones and said another of said zones being intermediate said first and third of said zones.
Claim 2
Independent Claim
255 words
An apparatus for screening a mixture of fibrous material and liquid to separate the fibrous material into an accepts portion and a rejects portion, comprising an annular screen having openings adapted for accepting the accepts portion of the fibrous material and rejecting the rejects portion thereof, a rotatably driven annular wall member extending circumferentially along said screen and spaced therefrom by an annular fluid passage longitudinally between said wall member and said screen, inlet means communicating with one end of said fluid passage for supplying the mixture to said fluid passage at said one end thereof, rejects outlet means communicating with the other end of said fluid passage for discharging the rejects portion rejected by said screen openings from said other end of said fluid passage, and accepts outlet means for discharging the accepts portion accepted by said screen openings, said wall member including a plurality of distinct circumferential zones arranged longitudinally of said wall member and bounding said fluid passage, a first of said zones basically comprising a plurality of circumferential rows of depressions around said wall member, another of said zones basically comprising a plurality of circumferential rows of protrusions around said wall member and a third of said zones comprising circumferential rows of depressions therearound, said first of said zones being adjacent said one end of said fluid passage, said third of said zones being spaced longitudinally of said wall member from said first of said zones and said another of said zones being intermediate said first and third of said zones.
Claim 3
Dependent Claim
54 words
A screening apparatus according to claim 1, further comprising dilution liquid inlet means for supplying dilution liquid to said fluid passage intermediate the ends thereof, said third circumferential zone of said wall member having at least a portion intermediate said one end of said fluid passage and the means to supply dilution liquid thereto.
Claim 4
Independent Claim
247 words
An apparatus for screening a mixture of fibrous material and liquid to separate the fibrous material into an accepts portion and a rejects portion, comprising an annular screen having openings adapted for accepting the accepts portion of the fibrous material and rejecting the rejects portion thereof, a rotatably driven annular wall member extending circumferentially along said screen and spaced therefrom by an annular fluid passage longitudinally between said wall member and said screen, inlet means communicating with one end of said fluid passage for supplying the mixture to said fluid passage at said one end thereof, rejects outlet means communicating with the other end of said fluid passage for discharging the rejects portion rejected by said screen openings from said other end of said fluid passage, accepts outlet means for discharging the accepts portion accepted by said Screen openings, said wall member having one circumferential end portion adjacent said one end of said fluid passage and the other circumferential end portion adjacent said other end of said fluid passage and said wall member having a circumferential intermediate portion between said circumferential end portions, said one circumferential end portion of said wall member having surface deformations basically comprising a plurality of circumferential rows of depressions therearound and said other circumferential end portion of said wall member also having a plurality of circumferential rows of depressions therearound, and said circumferential intermediate portion of said wall member having surface deformations basically comprising a plurality of circumferential rows of protrusions therearound.
Claim 5
Independent Claim
247 words
An apparatus for screening a mixture of fibrous material and liquid to separate the fibrous material into an accepts portion and a rejects portion, comprising an annular screen having openings adapted for accepting the accepts portion of the fibrous material and rejecting the rejects portion thereof, a rotatably driven annular wall member extending circumferentially along said screen and spaced therefrom by an annular fluid passage longitudinally between said wall member and said screen, inlet means communicating with one end of said fluid passage for supplying the mixture to said fluid passage at said one end thereof, rejects outlet means communicating with the other end of said fluid passage for discharging the rejects portion rejected by said screen openings from said other end of said fluid passage, accepts outlet means for discharging the accepts portion accepted by said Screen openings, said wall member having one circumferential end portion adjacent said one end of said fluid passage and the other circumferential end portion adjacent said other end of said fluid passage and said wall member having a circumferential intermediate portion between said circumferential end portions, said one circumferential end portion of said wall member having surface deformations basically comprising a plurality of circumferential rows of depressions therearound and said other circumferential end portion of said wall member also having a plurality of circumferential rows of depressions therearound, and said circumferential intermediate portion of said wall member having surface deformations basically comprising a plurality of circumferential rows of protrusions therearound.
Claim 6
Dependent Claim
37 words
A screening apparatus according to claim 3, wherein said screen is provided with an annular baffle at said one end of said fluid passage opposite the depressions on said one circumferential end portion of said wall member.
Claim 7
Dependent Claim
44 words
A screening apparatus according to claim 3, wherein said screen is provided with an annular baffle opposite said other circumferential end portion of said wall member, and a dilution inlet is provided in said annular baffle for discharging dilution liquid to said fluid passage.
Claim 8
Dependent Claim
31 words
A screening apparatus according to claim 5, wherein said other circumferential end portion of said wall member has a plurality of protrusions at locations spaced circumferentially therearound intermediate its said depressions.
Claim 9
Dependent Claim
43 words
A screening apparatus according to claim 6, wherein said protrusions on said other circumferential end portion of said wall member are located longitudinally of such end portion whereby the area of such end portion opposite said dilution inlet is free of such protrusions.
Claim 10
Dependent Claim
49 words
A screening apparatus according to claim 3, wherein the length of said one circumferential end portion of said wall member is, in the longitudinal direction of said wall member, substantially shorter than the lengths of the other two said circumferential portions in the longitudinal direction of said wall member.
Claim 11
Dependent Claim
15 words
A screening apparatus according to claim 3, wherein said protrusions are larger than said depressions.
Claim 12
Independent Claim
346 words
An apparatus for screening a mixture of fibrous material and liquid to separate the fibrous material into an accepts portion and a rejects portion, comprising an annular screen having openings adapted for accepting the accepts portion of the fibrous material and rejecting the rejects portion thereof, a rotatably driven annular wall member extending circumferentially along said screen and spaced therefrom by an annular fluid passage longitudinally between said wall member and said screen, said screen and said wall member being arranged on generally vertical axes such that said fluid passage longitudinally extends generally vertically, said wall member having circumferential upper and lower end portions adjacent the upper and lower ends of said fluid passage respectively and also having a circumferential intermediate portion between said circumferential end portions, inlet means communicating with the upper end of said fluid passage for supplying the mixture to said fluid passage at said upper end thereof, rejects outlet means communicating with the lower end of said fluid passage for discharging the rejects portion rejected by said screen openings from said lower end of said fluid passage, accepts outlet means for discharging the accepts portion accepted by said screen openings, said circumferential upper end portion of the said wall member having surface deformations at least basically comprising a plurality of circumferential rows of depressions therearound and said screen opposite said circumferential upper end portion being provided with an annular baffle, said circumferential lower end portion of said wall member having a plurality of circumferential rows of depressions therearound and a plurality of protrusions located between such depressions, said screen being provided with a second annular baffle opposite said circumferential lower end portion and having a dilution inlet for supplying dilution liquid therethrough to said fluid passage, said protrusions on said circumferential lower end portion of said wall member being located whereby the area of said circumferential lower end portion opposite said dilution inlet is free of such protrusions, and said circumferential intermediate portion of said wall member having surface deformations at least basically comprising a plurality of circumferential rows of protrusions therearound.
Claim 13
Independent Claim
346 words
An apparatus for screening a mixture of fibrous material and liquid to separate the fibrous material into an accepts portion and a rejects portion, comprising an annular screen having openings adapted for accepting the accepts portion of the fibrous material and rejecting the rejects portion thereof, a rotatably driven annular wall member extending circumferentially along said screen and spaced therefrom by an annular fluid passage longitudinally between said wall member and said screen, said screen and said wall member being arranged on generally vertical axes such that said fluid passage longitudinally extends generally vertically, said wall member having circumferential upper and lower end portions adjacent the upper and lower ends of said fluid passage respectively and also having a circumferential intermediate portion between said circumferential end portions, inlet means communicating with the upper end of said fluid passage for supplying the mixture to said fluid passage at said upper end thereof, rejects outlet means communicating with the lower end of said fluid passage for discharging the rejects portion rejected by said screen openings from said lower end of said fluid passage, accepts outlet means for discharging the accepts portion accepted by said screen openings, said circumferential upper end portion of the said wall member having surface deformations at least basically comprising a plurality of circumferential rows of depressions therearound and said screen opposite said circumferential upper end portion being provided with an annular baffle, said circumferential lower end portion of said wall member having a plurality of circumferential rows of depressions therearound and a plurality of protrusions located between such depressions, said screen being provided with a second annular baffle opposite said circumferential lower end portion and having a dilution inlet for supplying dilution liquid therethrough to said fluid passage, said protrusions on said circumferential lower end portion of said wall member being located whereby the area of said circumferential lower end portion opposite said dilution inlet is free of such protrusions, and said circumferential intermediate portion of said wall member having surface deformations at least basically comprising a plurality of circumferential rows of protrusions therearound.
Claim 14
Dependent Claim
70 words
A screening apparatus according to claim 10, wherein the length of said circumferential upper end portion of said wall member is, in the longitudinal direction of said wall member, substantially shorter than the lengths of the other two said circumferential portions in such longitudinal direction, and said protrusions of said intermediate portion are larger than said depressions and at least some of said protrusions of said circumferential lower end portion.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |