EP0212785B1 - Sortiervorrichtung für Papierfaserstoff - Google Patents

Sortiervorrichtung für Papierfaserstoff Download PDF

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Publication number
EP0212785B1
EP0212785B1 EP19860303932 EP86303932A EP0212785B1 EP 0212785 B1 EP0212785 B1 EP 0212785B1 EP 19860303932 EP19860303932 EP 19860303932 EP 86303932 A EP86303932 A EP 86303932A EP 0212785 B1 EP0212785 B1 EP 0212785B1
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EP
European Patent Office
Prior art keywords
reject
chamber
screening
materials
casing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19860303932
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English (en)
French (fr)
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EP0212785A1 (de
Inventor
Andrew C. Martin
Christian C/O Black Clawson Frnace Sauzedde
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BLACK CLAWSON (FRANCE) S.A.
Original Assignee
Black Clawson (France) SA
Black Clawson Co
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Publication date
Application filed by Black Clawson (France) SA, Black Clawson Co filed Critical Black Clawson (France) SA
Publication of EP0212785A1 publication Critical patent/EP0212785A1/de
Application granted granted Critical
Publication of EP0212785B1 publication Critical patent/EP0212785B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • Paper mills have for many years made extensive use, for the screening of paper making stock, of screening apparatus embodying a cylindrical perforate screen member defining screening and accepts chambers on the opposite sides thereof in a closed housing and provided with a rotor member which operates in one of the chambers to keep the screen perforations open and free from solid materials tending to cling to the screen surface.
  • the stock or furnish is delivered to the screening chamber adjacent one end of the screen member, and the material rejected by the screen member is collected and discharged from the opposite end of the screen member.
  • the primary direction of through flow is downwardly, with the stock entering the screen chamber from above, or in some cases centrally of the screening chamber when the direction of screening is from the outside to the inside of the screen member, so that any high specific gravity reject material entrained with the stock to be screened will travel by gravity to a reject discharge chamber in the lower part of the screen, from which it is subsequently discharged.
  • reject material to damage the perforate screen member as it travels through the screening chamber, especially with screens of the type wherein the screening chamber is on the inside of the perforate screen member, and wherein centrifugal force therefore will cause high specific gravity materials to travel along the screening surface.
  • reject material which is becoming increasingly prevalent in waste paper stocks, is material of lower specific gravity than the paper fibers, such as pieces of plastic, especially scraps of plastic foam.
  • the circulatory movement imparted to the stock in the screening chamber by whatever rotor is used will develop centrifugal force which will tend to cause such light materials to migrate toward the center of the screening and reject chambers.
  • Weber U.S. Patent No. 4,166,068 discloses a different construction of screening apparatus of the general type outlined above wherein the supply flow of stock to be screened enters the apparatus by way of an inlet chamber located entirely below the screening chamber, and wherein low specific gravity reject materials, including materials of substantially the same specific gravity as accepted fiber, are collected in a reject chamber above the screening chamber, and from which they are discharged by a port located generally centrally of the top wall of the apparatus in order to ensure effective removal of light reject materials of the types discussed above.
  • the high specific gravity reject materials entering through the stock inlet are retained in the inlet chamber by constructing the inlet and screening chambers so as to provide an annular space in the inlet chamber which is of greater outer diameter than the flow passage through which the stock enters the screening chamber, and producing sufficient centrifugal force in the inlet chamber to cause these high specific gravity materials, such as tramp metal and the like, to be collected in this annular space and thereby to prevent them from coming into contact with the screen member.
  • Such trapped high specific gravity materials are discharged from time to time directly from this annular space by the reject outlet means, so that only materials of approximately the same specific gravity as paper fiber or a lower specific gravity are allowed to reach the screening chamber.
  • DE-A-2413310 (GB-A-1,471,238) also discloses screening apparatus for paper stock wherein the supply flow of stock to be screened enters the apparatus by way of an inlet chamber located below the screening chamber, and wherein low specific gravity reject materials are collected in a reject chamber above the screening chamber.
  • the outlet from that upper reject chamber is located in the outer side wall of the chamber, and there is an inlet for dilution water on the opposite side of the chamber.
  • reject material which is removed from that chamber will be in highly diluted form, by reason of the water added to the chamber.
  • the present invention is especially concerned with the provision of screening apparatus which will be especially adapted for effective and efficient screening of the reject "tailings" from a primary screening station in a system for recovering reusable paper fiber from waste paper products, such for example as a system like that in Chupka U.S. Patent No. 4,873,410.
  • the tailings from the primary screening station in such a system are commonly relatively rich in light specific gravity reject materials, such particularly as pieces of plastic sheet, film and foam, but substantial quantities of good paper fiber are entrained or otherwise mixed and rejected therewith. It is for this purpose that a tailings screen is provided, and it has been common to use a vibrating screen for this purpose, but a related practical problem is that the relatively significant volume of reject materials normally leaves the tailing screen as a relatively small percentage of a correspondingly large volume of water suspension, and that water must be eliminated before the solid reject materials can be disposed of.
  • the screen of the present invention was especially developed for handling such tailings with the dual objective of recovering substantially all of the good paper making fiber and delivering the reject materials in relatively concentrated form, and in substantially dewatered form for ready final disposal.
  • the screen of the invention accomplishes these objectives at notably lower cost than existing screens for similar applications, particularly from the standpoint of both power and water usage.
  • the screen of the invention is generally similar in construction and mode of operation to the screen disclosed in the above-noted Weber patent, but it differs therefrom in a number of significant respects. More specifically, the screen of the invention differs from the screen shown in the Weber patent in its manner and means for treating reject materials of lower specific gravity than paper fibers.
  • the supply flow of stock to be screened enters the apparatus by way of an inlet chamber located below the screening chamber, and any high specific gravity materials which are present in that supply flow are trapped in the inlet chamber, in substantially the same manner as disclosed in the Weber patent.
  • the solid materials in the supply flow of stock into the screening chamber consist essentially of reusable fiber and low specific gravity reject materials. Special provision may be made for minimizing the possibility of light reject materials passing through the perforations in the screen cylinder, and further for washing good fiber free from the light reject materials and then concentrating those reject materials prior to their discharge from the screen.
  • Reject material which reaches this upper chamber is trapped against recirculating to the screening zone, and it is then carried further upwardly into an annular reject chamber in which it is retained while circulating about the inner wall of this chamber until the quantity of reject material in the chamber increases sufficiently to be carried out by way of a reject outlet port in the outer wall of the reject chamber.
  • Special provision may also be made for supplying washing liquid to the washing zone of the screening chamber from above, as well as to the reject chamber, in order to promote separation of good fiber from reject material and to carry the separated fiber to perforations in the screen cylinder for passage thereto to the accepts chamber.
  • the screen embodying the invention offers special advantages for the treatment of tailings in that it accomplishes substantially complete separation of usable fiber from reject material, and especially also in that it delivers the reject material in such thoroughly dewatered form that it can be disposed of in any desired manner as in essentially dry mass. Further, by reason of its efficient and effective screening action, the screen can be equipped with a screening cylinder having screening perforations of such small size as to reject virtually all contaminant particles, even including those of specific gravities so close to those of wet paper fibers as to be incapable of separation therefrom by gravitational or centrifugal forces.
  • the invention provides apparatus for screening paper fiber stock containing good fibers mixed with reject materials of lower specific gravity than the good fibers, comprising, a housing including a generally cylindrical vertical side wall and a top wall, means defining an inlet chamber in the lower end of said housing and including a stock inlet port to said inlet chamber, screening means including a cylindrical perforate screening member supported in an intermediate portion of said housing above said inlet chamber and separating said portion into a screening chamber and an annular accepts chamber on the inner and outer sides of said screening member respectively, means defining an outlet port from said accepts chamber, means in said housing defining a reject chamber above and in direct communication with said screening chamber for receiving therefrom stock containing said lower specific gravity material, said reject chamber having a radially inner wall which is of circular section and substantially smaller radius than said screening member, rotor means in said screening chamber mounted for rotation on the vertical axis of said screening member and including a hub and vanes mounted in radially inwardly spaced relation with said screening member and outwardly spaced relation with said hub to
  • the screening apparatus shown in Figs. 1-4 comprises a generally cylindrical vertical housing 10 mounted by a stand 11 on a base 12.
  • a cylindrical perforate screen member 13 divides the central portion of the interior of the housing 10 into a screening chamber 15 and an annular accepts chamber 16 having an outlet port 17.
  • the screening member 13 is provided with multiple perforations which may be of any conventional size, shape and spacing, a typical example being circular holes 1.57mm (0.062 inch) in diameter and in such spacing as to provide an open area in the range of 10-15%.
  • these perforations may comprise slots of the sizes and spacings disclosed in Seifert U.S. Patent No. 3,842,302, and the screening member may also be of the type shown in Chupka-Seifert U.S. Patent Nos. 4,155,841 or 4,383,918.
  • the inlet chamber 20 Below the screening member 13 is the inlet chamber 20, to which stock to be screened is supplied by way of a tangential inlet port 21.
  • the screening member 13 is supported at its lower end by an annular flange 22 extending inwardly from the wall of housing 10 and cooperating therewith to define an annular space 25 which extends around the outside of the inlet chamber 20 and has an inner diameter equal to that of the lower end of screening member 13.
  • a discharge port 26 from space 25 acts as a collection boot for trapping such reject material and may be provided with a suitable valve for periodic or intermittent dumping as disclosed in the Weber patent.
  • a rotor assembly indicated generally at 30 and including a hub 31 secured to the upper end of a drive shaft 32 supported by a suitably sealed bearing assembly 33 on a bracket 34 mounted within the stand 11.
  • the rotor assembly is shown as comprising four vanes 35 mounted by arms 36 on the hub 31.
  • the rotor hub 31 is a cylindrical body of substantial diameter in order to reduce the radial dimension of the screening chamber 15 in accordance with principles of the invention as described hereinafter.
  • the rotor hub 31 is provided adjacent its upper end with a radially extending flat disk baffle 40 having a circular periphery, except where it is cut out to accommodate the vanes 35.
  • the baffle 40 constitutes a partition separating the screening chamber 15 into a lower zone 41 and an upper zone 42, and the outer diameter of the baffle 40 is slightly smaller than the inner diameter of the screening member 13, e.g. 2.54 cm (one inch) to provide a correspondingly restricted annular passage 44 connecting these zones 41 and 42.
  • baffle 45 of inverted frustoconical shape is also mounted as shown on the rotor hub 31 and secured to the underside of the baffle 40.
  • This frustoconical baffle 45 further restricts the size of the lower screening chamber zone 41, and it also serves to direct the upward flow of stock from the inlet chamber 20 radially outward towards the annular passage 44, as further explained hereinafter.
  • the uppermost section of the housing 10 encloses a chamber 50 which corresponds to the reject chamber for low specific gravity materials in the screening apparatus of the Weber patent, but in accordance with the present invention, special features are incorporated in this chamber to minimize the possibility of recirculation of any stock from the upper end of the screening chamber to the lower end thereof.
  • These provisions have the dual objective of reducing the possibility of inclusion of such reject materials in the accepted stock, and also of accumulating, and thus concentrating, such reject material in the upper part of the housing for ultimate discharge in substantially dewatered condition as described hereinafter.
  • An annular disk baffle 51 is positioned in the chamber 50 to overlie the screening chamber 15.
  • the inner diameter of the baffle 51 is approximately equal to the inner diameter of the screening chamber 15, and a cylindrical inner wall 52 depends from the inner periphery of the baffle 51 into the upper end of the screening chamber 15, and preferably into closely spaced relation with the partition baffle 40.
  • the cylindrical inner wall 52 thus forms an inner wall for the upper screening chamber zone 42, and it also cooperates with the horizontal baffle 51 to form a restricted annular chamber 55 for receiving stock which flows upwardly from the screening chamber carrying low specific gravity reject materials.
  • An outlet port 56 for this stock leads tangentially from the chamber 55.
  • the stock to be screened is supplied to the inlet chamber 20 through inlet port 21 at sufficient velocity, e.g. 122-183 metres/mm (400-600ft.min.), to develop enough centrifugal force within the inlet chamber to cause any high specific gravity contaminant materials to travel directly to and around the peripheral wall of chamber 20.
  • These heavy reject materials will accordingly be concentrated in the annular space 25 and delivered from there by centrifugal force into the reject port 26. None of this heavy reject material will therefore be able to reach the screening chamber 15 through the flow passage thereto defined by the inner periphery of the flange 22 which supports the lower end of the screening member 13.
  • the action of the rotor assembly 30 will have a number of effects on the solid material initially mixed with the feed stock. It will initially create additional centrifugal force causing the good fiber, which is slightly heavier than water, to travel to and through the screening member 13.
  • the low specific gravity reject materials therein will be free to move radially inwardly toward the cylindrical inner wall 52, while whatever good fiber remains in zone 42, and which is of higher specific gravity than water, will tend to separate from the reject materials for passage through the upper part of screening member 13 into the accepts chamber 16.
  • the upper portions of the rotor vanes will continue to exert a circulatory force in the zone 42, causing the low specific gravity materials therein to circulate around the cylindrical inner wall 52 while the liquid exiting through the discharge port 56 will initially be relatively free of entrained particles.
  • the concentration of light reject particles in the chamber 55 will increase to the point that some will be entrained in the exiting stock in correspondingly increasing concentrations.
  • this screening apparatus is further increased by supplying washing liquid to the reject chamber 55 in order to enhance the separation in that chamber of good fiber from reject particles.
  • the upper chamber 50 is provided with a water inlet 57 in its top wall 58, and water is supplied through that inlet at sufficient pressure to cause it to enter the screening chamber zone 42 through the clearance between the lower end of the cylindrical inner wall 52 and the rotor hub and partition baffle 40 thereon.
  • This flow of washing liquid into the chamber 55 has the dual effect of preventing light reject particles from escaping into the chamber 50, and also of washing good fiber free from the light reject material in zone 42.
  • the most important operational feature is that the light reject materials entrained in the feed flow of stock are forced very quickly to and through the annular passage 44 into the upper screening chamber zone 42. Further, the light reject materials which reach the zone 42 are retained therein and in the reject chamber 55 and are thus prevented from recirculating within the housing 10 back to the lower end of the screening chamber 15 and its lower zone 41.
  • a T-fitting 60 has its central port 61 directly mounted on the reject discharge port 56, and a casing 62 is mounted on one of the other two ports of this fitting.
  • a screw press comprising a compaction screw 65 extending through the major part of the fitting 60 and also in the casing 62, and a perforated cylinder 66 mounted within the casing 62.
  • the compacted reject material collects at the outer end of the casing 62, which is normally closed by a cover plate 80 that includes a supporting arm 81 having a pivotal mounting 82 on the casing 62 about which cover plate 80 can swing into and out of closing relation with the open end of casing 62.
  • the cover plate 80 is normally biased to closed position by means such as a fluid pressure cylinder 83 having its closed end pivotally mounted at 84 on the other end of the casing 62 and having its piston 85 pivotally connected at 86 to the cover plate arm 81.
  • the cylinder 83 is supplied with operating fluid at a predetermined pressure in the direction to hold the cover plate 80 closed. Then as the reject material accumulates between the inner surface of cover plate 80 and the screw 65, it will overcome this pressure, force the cover plate open, and discharge as relatively dry compacted solid material into a suitable receptacle, not shown.
  • the degree of dryness can readily be controlled by regulation of the operating pressure in cylinder 83, in that extrusion of the reject material can occur only after it has been sufficiently compacted, and correspondingly dewatered, to force cover plate 80 open against that pressure.
  • a cylindrical perforate screen member 113 divides the central portion of the interior of the housing 110 into a screening chamber 115 and an annular accepts chamber 116 having an outlet port 117.
  • the stock enters the lower end of the screening chamber 115 from an inlet chamber 120 wherein high specific gravity reject material is trapped for separate removal as previously described
  • the rotor assembly 130 includes a hub 131 secured on the upper end of the drive shaft 132.
  • This rotor assembly is shown as incorporating two oppositely disposed vanes 135 which are mounted on the hub 131 by arms 136 extending from the lower portion of the hub, and by the flat disk baffle 140, which has the same function as the baffle 40 in separating the screening chamber into a lower zone 141 and an upper zone 142 connected by an annular passage 144.
  • the inverted frustoconical baffle 145 functions in the same manner as described for baffle 45, and it also serves as a brace for the flat disk baffle 140.
  • Both of baffles 140 and 145 are shown as provided with a plurality of evenly distributed holes 146 and 147 which contribute to the washing operation of this screen as described hereinafter.
  • the annular top plate 151 corresponds to the annular baffle 51 in Fig. 2 and supports a cylindrical casing 153 which cooperates with a cylindrical inner wall 152 to define an annular reject chamber 155.
  • the outlet port 156 from chamber 155 is shown as leading radially from the casing 153 but could of course be located to extend tangentially therefrom if desired.
  • the interior of the cylindrical inner wall 152 is connected with a supply pipe 157 for washing water which extends upwardly from the top cover 158 for casing 153.
  • the cylindrical inner wall 152 extends at its lower end into relatively closely spaced relation with the upper surface of disk baffle 140 to provide a cylindrical slot therebetween through which washing liquid can flow into the upper zone 142 of the screening chamber.
  • the cylindrical inner wall 152 is provided with multiple discharge holes 159 for washing liquid which are spaced around its periphery in that portion of the baffle below the level of the cover plate 151. Above that level, however, there are similar holes 159 only in the portion of the wall of cylindrical inner wall 152 facing away from the reject outlet 156, and there are no such holes through which washing liquid can be discharged directly toward the reject outlet port 156.
  • reject material carried out in the screen of the invention is not limited to the separation of good fiber from lower specific gravity materials.
  • a common constituent in the tailings from the primary screening station of a waste paper system has been found to comprise small bits of wet strength paper which are of essentially the same specific gravity as good paper fibers.
  • reject pieces which are too large for passage through the perforations in the screening cylinder 113 are caused to travel upwardly within the screening chamber, and after they are rejected by the perforations in the screen member 113, the upward pressure flow will ultimately carry them into the reject chamber 155 from which they reach its outlet 156.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Cyclones (AREA)
  • Centrifugal Separators (AREA)

Claims (3)

  1. Vorrichtung zum Sieben von Papierfaserstoff, welcher gute Fasern enthält, die mit zurückzuhaltenden Materialien geringeren spezifischen Gewichtes als die guten (geeigneten) Fasern gemischt sind, mit einem Gehäuse (10, 100), welches eine in etwa zylindrische vertikale Seitenwand und eine Deckwand aufweist, einer Einrichtung, welche eine Einlaßkammer (20, 120) im unteren Ende des Gehäuses definiert und einen Materialeinlaßanschluß (21, 121) in die Einlaßkammer aufweist, einer Siebeinrichtung, welche ein zylindrisches, perforiertes Siebteil (13, 113) aufweist, welches in einem mittleren Abschnitt des Gehäuses oberhalb der Einlaßkammer (20, 120) gehaltert ist und diesen Abschnitt in eine Siebkammer (15, 115) und eine ringförmige Aufnahmekammer (16, 116) an den inneren bzw. äußeren Seiten des Siebteiles (13, 113) aufteilt, einer Einrichtung, welche einen Auslaßanschluß (17, 117) aus der Annahmekammer definiert, einer Einrichtung in dem Gehäuse, welche eine Abweisekammer (55, 155) oberhalb und in direkter Verbindung mit der Siebkammer (15, 115) definiert, um von dort Material aufzunehmen, welches das Material mit geringerem spezifischen Gewicht enthält, wobei die Abweisekammer eine radial innen liegende Wand (52, 152) hat, die einen kreisförmigen Querschnitt hat und einen beträchtlich kleineren Radius als das Filterteil, einer Rotoreinrichtung (30, 130) in der Siebkammer (15, 115), welche für eine Drehung auf der vertikalen Achse des Siebteiles montiert ist und eine Nabe (31, 131) sowie Flügel (35, 135) aufweist, die mit radialem Abstand innerhalb des Siebteiles und außerhalb der Nabe (31, 131) montiert sind, um einen ringförmigen Raum (41-42) zwischen der Nabe und den Flügeln bereitzustellen, und mit einer Einrichtung, welche einen Abweisauslaßdurchgang (56, 156) definiert, wobei die Drehung des Rotors veranlaßt, daß die Flügel eine kreisförmige Bewegung des Materials in der Sieb- und der Abweisekammer bewirken, dadurch gekennzeichnet, daß
       die Einrichtung, welche den Abweiseauslaßdurchgang (56, 156) definiert, direkt zur Außenseite des Gehäuses führt und mit ihrem inneren Ende unmittelbar an die Innenwand (52, 152) anschließt, um das konzentrierte Abweismaterial mit dem geringeren spezifischen Gewicht aus dem Gehäuse zu entfernen,
       und daß weiterhin eine Einrichtung (60-86) vorgesehen ist, die mit dem Abweiseauslaßdurchgang (56, 156) verbunden ist, um das konzentrierte Abweismaterial zu entwässern und das entwässerte Material aus dem Auslaßende des Durchganges zu entfernen, wobei die Entwässerungseinrichtung ein rohrfömiges Gehäuse (62) aufweist, welches mit dem Auslaßdurchgang (56, 156) verbunden ist, um das konzentrierte Abweismaterial von dort aufzunehmen, eine Schraubenpreßeinrichtung (65-66) innerhalb des Gehäuses aufweist, um das Abweismaterial, welches aus dem Auslaßdurchgang (56) aufgenommen wurde, zusammenzupressen und das daraus entstehende zusammengepreßte Abweismaterial und die Flüssigkeit, durch welche dasselbe in das Gehäuse transportiert wurde, getrennt auszugeben, und eine Verschlußeinrichtung (80) für das Gehäuse aufweist, welche in Richtung auf die geschlossene Position vorgespannt ist und in Richtung auf die offene Stellung nachgiebig ist unter Ansprechen auf die Bewegung des zusammengedrückten Abweismaterials dagegen durch die Schraubenpreßeinrichtung.
  2. Siebvorrichtung nach Anspruch 1, wobei die Entwässerungseinrichtung einen T-Anschluß (60) aufweist, dessen mittleres Anschlußstück mit dem Abweisauslaßdurchgang (56) verbunden ist, das Gehäuse (62) aufweist, welches an einem der anderen Anschlußstücke des Anschlusses montiert ist, ein perforiertes zylindrisches Siebteil (66) aufweist, welches innerhalb des Gehäuses montiert ist, eine Vorschubschraube (65) aufweist, welche in dem Siebteil (66) angeordnet ist, Einrichtungen (70, 72) aufweist, um die Vorschubschraube anzutreiben, um das Abweismaterial, welches von dem Auslaßanschluß in dem Siebteil (66) aufgenommen wurde, zusammenzudrücken und dadurch das zusammengedrückte Material zu entwässern, indem die Flüssigkeit durch das perforierte Siebteil (66) da herausgepreßt wird, und eine Einrichtung aufweist, welche separate Ausgabeanschlüsse (68, 80) für die Flüssigkeit und das Abweismaterial aus dem Gehäuse bildet.
  3. Siebvorrichtung nach Anspruch 1 oder 2, wobei eine Einrichtung (57, 157) vorgesehen ist, um eine Waschflüssigkeit direkt dem inneren Abschnitt der Abweiskammer zuzuführen, damit diese von dort in die Siebkammer fließt, um die Abtrennung der Papierfasern vom Abweismaterial in die Abweiskammer hinein unterstützt.
EP19860303932 1985-08-09 1986-05-23 Sortiervorrichtung für Papierfaserstoff Expired - Lifetime EP0212785B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US76426385A 1985-08-09 1985-08-09
US764263 1991-09-23

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EP0212785A1 EP0212785A1 (de) 1987-03-04
EP0212785B1 true EP0212785B1 (de) 1991-07-31

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JP (1) JPS6241391A (de)
CA (1) CA1288732C (de)
DE (1) DE3680605D1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI80735B (fi) * 1988-08-04 1990-03-30 Tampella Oy Ab Foerfarande och anordning foer sortering och behandling av massa.
JP4909693B2 (ja) * 2006-07-24 2012-04-04 相川鉄工株式会社 スクリーン装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3223239A (en) * 1962-05-11 1965-12-14 Bird Machine Co Pressure type screening devices
CA1163236A (en) * 1980-03-17 1984-03-06 David E. Chupka Dual flow screening apparatus

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EP0212785A1 (de) 1987-03-04
JPS6241391A (ja) 1987-02-23
DE3680605D1 (de) 1991-09-05
CA1288732C (en) 1991-09-10

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