Patent US3563610A successfully refreshed from Google Patents.
Patent US4880540A successfully refreshed from Google Patents.
US4880540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulp screening apparatus
Assignee: AHLSTROM PROCESS EQUIPMENT Inc
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Filing: 1987-06-11
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Granted: 1989-11-14
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Expires: 2007-06-11
Abstract
Abstract The pulp screening apparatus comprises a housing having an inlet for allowing fibrous stock to be introduced into the interior, a first outlet for allowing the accept screened stock to be removed, a second outlet for the reject, a screen having a contour surface within the housing, a rotor moving in the vicinity of the screen at a predetermined speed and forming together with the screen an annular screening chamber. The rotor has at least the surface facing the screen partially contoured and is provided with a plurality of perforations along at least a portion of the length of the screening chamber to allow fibrous stock to be introduced into the screening chamber and to prevent the undesired debris of the stock from entering the chamber. Both sides of the rotor may have a contoured surface with grooves.
Inventors
- 👤 Frey Frejborg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:50
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/18; D21D5/22; D21D5/02; D21D5/16; B; B01; B01D; B01D29/00; B01D29/01; B01D29/03; B01D29/88; B01D29/94; B01D29/945; B01D33/00; B01D33/06; B01D33/067; B01D2201/00; B01D2201/18; B01D2201/184
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
147 words
A pulp screening apparatus comprising a housing having an inlet for allowing fibrous stock to be introduced into the interior thereof, a first outlet for allowing the accept screened stock to be removed therefrom, a second outlet for the reject, a screen cylinder having a contour surface with grooves within said housing, a rotor moving in the vicinity of said screen at a predetermined speed and forming together with said screen an annular screening chamber, said rotor being located in the inlet side of the screen and wherein at least the surface facing the screen is at least partially contoured with grooves and is provided with a plurality of openings or perforations along at least a portion of the length of said screening chamber to allow fibrous stock to be introduced into said screening chamber and prevent the undesired debris of the stock from entering said chamber.
Claim 2
Dependent Claim
147 words
A pulp screening apparatus comprising a housing having an inlet for allowing fibrous stock to be introduced into the interior thereof, a first outlet for allowing the accept screened stock to be removed therefrom, a second outlet for the reject, a screen cylinder having a contour surface with grooves within said housing, a rotor moving in the vicinity of said screen at a predetermined speed and forming together with said screen an annular screening chamber, said rotor being located in the inlet side of the screen and wherein at least the surface facing the screen is at least partially contoured with grooves and is provided with a plurality of openings or perforations along at least a portion of the length of said screening chamber to allow fibrous stock to be introduced into said screening chamber and prevent the undesired debris of the stock from entering said chamber.
Claim 3
Dependent Claim
27 words
The apparatus according to claim 1, wherein the rotor has an inlet side surface and an outlet side surface and both surfaces of said rotor are grooved.
Claim 4
Dependent Claim
38 words
The apparatus according to claim 2 wherein, the opening of the perforations of the rotor have an inlet and the inlet of the perforations is disposed in the bottom part of the grooves of the rotor inlet side.
Claim 5
Dependent Claim
42 words
The apparatus according to claim 2 wherein the contoured surface of the screen consists of grooves with perforations, said perforations being holes or slots, the grooves and the perforations of the rotor are larger than the grooves and perforations of the screen.
Claim 6
Dependent Claim
79 words
The apparatus according to claim 4 wherein the screen has an envelope surface and is a cylindrical screenplate having grooves with perforations, the perforations are at the bottom of the grooves, the bottom plane of the grooves is parallel to the envelope surface, the grooves have two side planes, one side plane of the grooves is substantially perpendicular to the envelope surface of the screen surface and the other side plane is inclined with regard to said envelope surface.
Claim 7
Dependent Claim
109 words
The apparatus according to claim 5 wherein said screen plate has grooves in the side of the inlet recessed in the screen surface, the screen plate having an envelope surface, the grooves being formed of an upstream side plane, as seen standing from the bottom of the grooves, a downstream side plane and a bottom plane, said bottom plane being substantially parallel to the envelope surface of the screen plate, the grooves having perforations in the bottom plane, the upstream side plane of the grooves being substantially perpendicular to said envelope surface and the downstream side place of the grooves forming a 60° -5° angle against said envelope surface.
Claim 8
Dependent Claim
39 words
The apparatus according to claim 6 wherein in said screen plate the downstream side plane and the upstream side plane of the grooves are connected to each other by means of a plane substantially parallel to said envelope surface.
Claim 9
Dependent Claim
35 words
The apparatus according to claim 5 wherein the downstream side plane of the grooves of the screen is substantially perpendicular to the envelope surface of the screen surface and the upstream side plane is inclined.
Claim 10
Dependent Claim
48 words
The apparatus according to claim 1, wherein said grooves of the rotor have a bottom plane and two side planes, of which one is inclined and the other is perpendicular to the bottom plane, said inclined plane forming an angle with the bottom plane between 5° and 60°.
Claim 11
Dependent Claim
50 words
The apparatus according to claim 9, wherein the grooves of the rotor have an upstream side and a downstream side, the downstream side of the grooves of the rotor is inclined against the surface of the rotor and the upstream side is essentially perpendicular to the surface of the rotor.
Claim 12
Dependent Claim
49 words
The apparatus according to claim 9 wherein the grooves of the rotor have an upstream side and a downstream side, the downstream side plane of the grooves of the rotor is essentially perpendicular to the bottom plane and the upstream side is inclined against the surface of the rotor.
Claim 13
Dependent Claim
29 words
The apparatus according to claim 9 wherein the perforations have an outlet and the outlet is disposed in the inclined plane of the grooves of the rotor outlet side.
Claim 14
Dependent Claim
25 words
The apparatus according to claim 9 wherein the perforations have an outlet disposed in the upper plane of the grooves of the rotor outlet side.
Claim 15
Dependent Claim
25 words
The apparatus according to claim 9 wherein the perforations have an outlet disposed in the bottom plane of the grooves of the rotor outlet side.
Claim 16
Dependent Claim
14 words
The apparatus according to claim 3 wherein said grooves also have an upper plane.
Claim 17
Dependent Claim
19 words
The apparatus according to claim 1 wherein the rotor inner surface faces the outer contour surface of the screen.
Claim 18
Dependent Claim
31 words
The apparatus according to claim 16 wherein said screen has an inlet side and an outlet side, and the contoured surface of the screen is on the outside of the screen.
Claim 19
Dependent Claim
11 words
The apparatus according to claim 1 wherein said rotor is cylindrical.
Claim 20
Dependent Claim
11 words
The apparatus according to claim 1 wherein said rotor is non-cylindrical.
Claim 21
Dependent Claim
14 words
The apparatus according to claim 1 wherein the perforations in the rotor are cylindrical.
Claim 22
Dependent Claim
14 words
The apparatus according to claim 1 wherein the perforations in the rotor are non-cylindrical.
Claim 23
Dependent Claim
30 words
The apparatus according to claim 1 wherein said screen has an inlet side and an outlet side, the contoured surface of the screen is on the inside of the screen.
Claim 24
Dependent Claim
33 words
The apparatus according to claim 1 wherein the contoured surface of the screen consists of grooves and both side planes of the grooves are substantially perpendicular to the envelope surface of the screen.
Claim 25
Dependent Claim
79 words
The apparatus according to claim 1 wherein the screen has an envelope surface is a cylindrical screenplate having grooves, the perforations are at the bottom of the grooves, the bottom plane of the grooves is parallel to the envelope surface, the grooves have two side planes and an upper plane, one side plane of the grooves is substantially perpendicular to the envelope surface of the screen and the other side plane is curved with regard to said envelope surface.
Claim 26
Dependent Claim
20 words
The apparatus according to claim 24 wherein said side plane is convex or concave with respect to said envelope surface.
Claim 27
Dependent Claim
36 words
The apparatus according to claim 1 wherein the screen has an envelope surface and the surface is undulant, the screen has grooves and both sides of the grooves are inclined with respect to the envelope surface.
Claim 28
Dependent Claim
149 words
A pulp screening apparatus comprising a housing having an inlet for allowing fibrous stock to be introduced into the interior thereof, a first outlet for allowing the accept screened stock to be removed therefrom, a second outlet for the reject, a screen cylinder having a contour surface with grooves within said housing, a rotor moving in the vicinity of said screen at a predetermined speed and forming together with said screen an annular screening chamber, said rotor being located in the inlet side of the screen and wherein at least the surface facing the screen is at least partially contoured with spaced contoured bars and is provided with as plurality of openings or perforations along at least a portion of the length of said screening chamber to allow fibrous stock to be introduced into said screening chamber and prevent the undesired debris of the stock from entering said chamber.
Claim 29
Dependent Claim
149 words
A pulp screening apparatus comprising a housing having an inlet for allowing fibrous stock to be introduced into the interior thereof, a first outlet for allowing the accept screened stock to be removed therefrom, a second outlet for the reject, a screen cylinder having a contour surface with grooves within said housing, a rotor moving in the vicinity of said screen at a predetermined speed and forming together with said screen an annular screening chamber, said rotor being located in the inlet side of the screen and wherein at least the surface facing the screen is at least partially contoured with spaced contoured bars and is provided with as plurality of openings or perforations along at least a portion of the length of said screening chamber to allow fibrous stock to be introduced into said screening chamber and prevent the undesired debris of the stock from entering said chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |