EP0616072B1 - Process for screening a fibrous suspension and apparatus for its application - Google Patents
Process for screening a fibrous suspension and apparatus for its application Download PDFInfo
- Publication number
- EP0616072B1 EP0616072B1 EP94102519A EP94102519A EP0616072B1 EP 0616072 B1 EP0616072 B1 EP 0616072B1 EP 94102519 A EP94102519 A EP 94102519A EP 94102519 A EP94102519 A EP 94102519A EP 0616072 B1 EP0616072 B1 EP 0616072B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- partition
- screening device
- rakers
- openings
- flow
- 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
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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
- D21D5/04—Flat screens
-
- 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
- the invention relates to a screening device for sorting fiber suspension according to the preamble of claim 1.
- Sorting processes are often used in plants for the processing of waste paper, possibly also in the treatment of pulp suspensions.
- the aim of such a treatment of pulp suspensions is the separation of impurities or pieces of pulp which cannot be dissolved sufficiently.
- the focus is on contaminating substances that come from the use of the paper and would interfere with the processing and reuse of the recycled waste paper.
- Plastic contaminants, adhesive backs and highly wet-strength paper parts are particularly important. In principle, other contaminants can also be removed by means of such screening devices; For economic reasons, however, it is advisable in many cases to use the density deviating from the suspension, particularly in relation to stones, broken glass and metal parts, in hydrocyclones.
- the styrofoam parts also have the property of being able to float easily due to a much lower density and thus be removable in hydrocyclones, but on the other hand they are very easy to shred by mechanical forces to such an extent that their removal then becomes difficult. For this reason, it is often also desirable to remove styrofoam parts from the suspension very early in the preparation process.
- sorber devices of the type specified in the preamble are used.
- a screening device which is also provided with movable rotors on both sides of the planar separating element, that is to say on the inlet side and on the passage side, with clearers on the passage side and flow blades on the inlet side.
- the sieve is to be kept free by generating an axial suction on the sieve with the aid of the flow blades.
- the aim of the invention is therefore to create a screening device which guarantees perfect operation, in particular the freedom from blockage in a continuous mode of operation, but on the other hand does not crush the contaminants to be separated out or at most to such an extent that they can be eliminated effectively and economically.
- the flow blades are designed in this way and relative to the other parts of the machine positioned that mechanical comminution of the solids is extremely low.
- relatively large distances to the parts of the machine, relative to which the flow blades move can be selected, rounded edges on the flow blades and / or a cross-sectional geometry of the blades, which is designed such that the greatest possible momentum transfer to the suspension takes place, and so the relative movement between suspension and flow blades is reduced.
- the effect of the flow blades can advantageously be adjusted so that a transport movement of the solids takes place on the inlet side when they are being lifted off the partition by the pressure impulse of the scrapers through the openings. A clogging of the openings in the partition can therefore not occur.
- a low mechanical stress on the fibrous material may occasionally be desirable as long as there is no excessive comminution of contaminants.
- FIG. 1 shows a model of the sorting process according to the invention in three phases (1a, 1b, 1c), shown roughly schematically.
- both a flow blade 7 and a scraper 6 move along a partition wall 3 serving as a separating element.
- the suspension flow is indicated by arrows 12 in the area of the openings 2 indicated.
- a pressure pulse forms, which causes a backflow through the openings of the separating element.
- the solid particle 13 approaching the separating element.
- FIG. 1 b the solid particle 13 has attached itself to the separating element 3 and clogs part of the openings.
- the next flow blade 7 and the next scraper 6 are already approaching.
- the pressure pulse of the scraper 6 pushes the solid particles away from the separating element 3 so far that they can be moved by the flow generated by the blade 7 .
- FIG. 2 shows an example of a screening device according to the invention. It shows schematically a side sectional view of a housing 1 receiving the suspension S, which contains a partition 3 as a separating element.
- the partition 3 has a multiplicity of openings 2 (FIG. 3).
- the suspension flow which can pass through the dividing wall 3 through the openings 2, is led out of the housing through a connecting piece as a good substance G.
- the remaining amount also comes out of the housing 1 through a nozzle other than Reject R. In normal operation, the amount G is much larger than the amount R.
- the connecting shaft is guided centrally through the dividing wall 3, it being possible for sealing parts 10 to be used.
- a gap remains through which part of the suspension can flow. This would be harmless as long as no coarse parts get into the casting and there is no blocking of this space.
- the rotors can be driven, e.g. via a pulley 11. Furthermore, a bearing 12 is indicated.
- FIG. 3 shows a section of FIG. 2 and shows in particular how the distance A1 between flow blades 7 and partition 3 and the distance A2 between partition 3 and scraper 6 are defined.
- the outer diameter of the rotor with the flow blades 7 ' is selected in FIG. 4 such that it is slightly smaller than the inner diameter of the annular perforated partition 3'. This makes it easy to Install and remove from the inlet side 4 without removing the rotor carrying the flow blades 7 '.
- the rotor itself becomes smaller and therefore cheaper. In operation, its effect also extends to the radially outside area, so that the holes can be kept free by interaction with the clearers 6 passing close to the partition 3 '.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
Description
Die Erfindung betrifft eine Siebvorrichtung zur Sortierung von Faserstoffsuspension gemäß Oberbegriff des Anspruchs 1.The invention relates to a screening device for sorting fiber suspension according to the preamble of
Sortierverfahren werden häufig in Anlagen zur Aufbereitung von Altpapier angewendet, eventuell auch bei der Behandlung von Zellstoffsuspensionen. Das Ziel bei einer solchen Behandlung von Faserstoffsuspensionen ist die Abtrennung von Verunreinigungen oder nicht genügend auflösbaren Faserstoffstücken. Im Vordergrund stehen dabei verunreinigende Stoffe, die aus der Benutzung des Papiers stammen und bei der Verarbeitung und Wiederverwendung des aufbereiteten Altpapiers stören würden. Dabei ist insbesondere an Kunststoffverunreinigungen, Kleberücken und hochnaßfeste Papieranteile zu denken. Andere Verunreinigungen können zwar prinzipiell auch durch derartige Siebvorrichtungen entfernt werden; es empfiehlt sich aber aus ökonomischen Gründen in vielen Fällen die Ausnutzung der von der Suspension abweichenden Dichte, was insbesondere Steine, Glasscherben und Metallteile betrifft, in Hydrozyklonen. Die Styroporteile haben zwar auch die Eigenschaft, aufgrund einer sehr viel geringeren Dichte leicht aufzuschwimmen und dadurch in Hydrozyklone entfernbar zu sein, andererseits sind sie aber sehr leicht durch mechanische Kräfte so weit zu zerkleinern, daß ihre Entfernung dann schwierig wird. Aus diesem Grunde wird es oft auch gewünscht, Styroporteile sehr früh im Aufbereitungsprozeß aus der Suspension zu entfernen.Sorting processes are often used in plants for the processing of waste paper, possibly also in the treatment of pulp suspensions. The aim of such a treatment of pulp suspensions is the separation of impurities or pieces of pulp which cannot be dissolved sufficiently. The focus is on contaminating substances that come from the use of the paper and would interfere with the processing and reuse of the recycled waste paper. Plastic contaminants, adhesive backs and highly wet-strength paper parts are particularly important. In principle, other contaminants can also be removed by means of such screening devices; For economic reasons, however, it is advisable in many cases to use the density deviating from the suspension, particularly in relation to stones, broken glass and metal parts, in hydrocyclones. The styrofoam parts also have the property of being able to float easily due to a much lower density and thus be removable in hydrocyclones, but on the other hand they are very easy to shred by mechanical forces to such an extent that their removal then becomes difficult. For this reason, it is often also desirable to remove styrofoam parts from the suspension very early in the preparation process.
Damit überhaupt ein derartiges Sortierverfahren betriebssicher ausgeführt werden kann, sind die erwähnten Mittel zur Räumung einzusetzen. Neben der an sich gewünschten Wirkung, nämlich das Absetzen und Zusetzen von Maschinenteilen zu verhindern, können sie auch die unerwünschte haben , nämlich die an sich aufgrund ihrer Größe ausscheidbaren Feststoffteilchen so weit zu zerkleinern, daß ihre Ausscheidung schwierig wird. Es wurde auch versucht, diesen Nachteil dadurch zu vermeiden, daß die Räummittel auf der Gutstoffseite der Trennmittel eingesetzt wurden. Das ergab aber nicht immer eine ausreichende Sicherheit gegen Verstopfen, zumal nicht bei starker Schmutzbelastung.So that such a sorting process can be carried out in a manner that is reliable in operation, the means mentioned for clearing must be used. In addition to the effect desired per se, namely to prevent the setting down and clogging of machine parts, they can also have the undesirable effect, namely that due to itself to reduce the size of solid particles which can be separated out to such an extent that their removal becomes difficult. Attempts have also been made to avoid this disadvantage by using the broaching agents on the accepting side of the release agents. However, this did not always result in sufficient security against clogging, especially not when there is a lot of dirt.
Um die beschriebenen Sortierverfahren durchzuführen, werden Sorbervorrichtungen der im Oberbegriff angegebenen Art verwendet. So ist z.B. aus der EP-A-0 465 312 eine Siebvorrichtung bekannt, die ebenfalls beidseitig des ebenen Trennelementes, also an der Zulaufseite und an der Durchlaufseite mit bewegbaren Rotoren versehen ist, wobei auf der Durchlaufseite Räumer und auf der Zulaufseite Strömungsschaufeln vorhanden sind. Bei dieser bekannten Siebvorrichtung soll die Freihaltung des Siebes dadurch gewährleistet werden, daß mit Hilfe der Strömungsschaufeln ein Axialsog am Sieb erzeugt wird. Hierdurch und durch die weiterhin gewünschte Funktion des Stoffaufschlagens wird jedoch ein beträchtlicher Umtrieb erzeugt, der Energie kostet und sowohl die Zerkleinerung der abgewiesenen Stoffe als auch den Verschleiß der Bauteile fördert.In order to carry out the sorting processes described, sorber devices of the type specified in the preamble are used. For example, from EP-A-0 465 312 a screening device is known which is also provided with movable rotors on both sides of the planar separating element, that is to say on the inlet side and on the passage side, with clearers on the passage side and flow blades on the inlet side. In this known sieve device, the sieve is to be kept free by generating an axial suction on the sieve with the aid of the flow blades. As a result of this and the still desired function of the stocking up, however, a considerable amount of rotation is generated, which costs energy and promotes both the comminution of the rejected materials and the wear of the components.
In der US-A-2 480 119 soll die Siebfreihaltung durch wechselseitiges Vorbeilaufen der beidseitig angebrachten Rotorflügel verbessert werden. Auch diese Methode ist mit beträchtlichem Energieeinsatz verbunden und fördert das Zerkleinern der aufgrund ihrer Größe abgewiesenen Feststoffe.In US Pat. No. 2,480,119, the sieve clearance is to be improved by reciprocally passing the rotor blades attached on both sides. This method, too, is associated with considerable energy consumption and promotes the comminution of the solids rejected due to their size.
Die Erfindung setzt sich daher zum Ziel, eine Siebvorrichtung zu schaffen, die einen einwandfreien Betrieb garantiert, insbesondere die Verstopfungsfreiheit bei kontinuierlicher Fahrweise, andererseits aber die auszuscheidenden Verunreinigungen nicht oder höchstens so weit zerkleinert, daß ihre Ausscheidung effektiv und wirtschaftlich möglich ist.The aim of the invention is therefore to create a screening device which guarantees perfect operation, in particular the freedom from blockage in a continuous mode of operation, but on the other hand does not crush the contaminants to be separated out or at most to such an extent that they can be eliminated effectively and economically.
Dieses Ziel wird durch die Merkmale im Kennzeichen des Anspruchs 1 voll erfüllt. Vorteilhafte Vorrichtungen zur Ausführung der Erfindung sind in den sich anschließenden Unteransprüchen aufgeführt.This goal is fully met by the features in the characterizing part of
Durch diese Maßnahmen wird einerseits an der Durchlaufseite mit den dort arbeitenden Räumern eine intensive Freihaltung der Öffnungen in der Trennwand möglich, insbesondere durch Druck- und Saugimpulse, die stark genug sind, um auch in den Öffnungen und durch sie hindurch zu wirken. Diese Druck- und Saugimpulse sind Folge einer großen Relativbewegung zwischen Suspension und Räumem. Andererseits werden durch die Strömungsschaufeln auf der Gegenseite, also der Zulaufseite der mit Öffnungen versehenen Trennwand, die abgewiesenen, sich dort aufkonzentrierenden Feststoffe sehr schonend abtransportiert .These measures make it possible on the one hand on the flow side with the clearers working there to keep the openings in the partition wall clear, in particular by pressure and suction pulses which are strong enough to also act in the openings and through them. These pressure and suction impulses are the result of a large relative movement between the suspension and the scraper. On the other hand, the rejected, concentrating solids are removed very gently by the flow blades on the opposite side, that is, the inlet side of the partition provided with openings.
In den zur Durchführung des Verfahrens vorgesehenen Vorrichtungen sind die Strömungsschaufeln so gestaltet und relativ zu den übrigen Teilen der Maschine positioniert, daß eine mechanische Zerkleinerung der Feststoffe äußerst gering wird. Dazu können relativ große Abstände zu den Teilen der Maschine, relativ zu denen sich die Strömungsschaufeln bewegen, gewählt werden, abgerundete Kanten an den Strömungsschaufeln und/oder eine Querschnittsgeometrie der Schaufeln, welche derart ausgebildet ist, daß eine möglichst weitgehende Impulsübertragung auf die Suspension stattfindet, und so die Relativbewegung zwischen Suspension und Strömungsschaufeln verringert wird.In the devices provided for carrying out the method, the flow blades are designed in this way and relative to the other parts of the machine positioned that mechanical comminution of the solids is extremely low. For this purpose, relatively large distances to the parts of the machine, relative to which the flow blades move, can be selected, rounded edges on the flow blades and / or a cross-sectional geometry of the blades, which is designed such that the greatest possible momentum transfer to the suspension takes place, and so the relative movement between suspension and flow blades is reduced.
Die Wirkung der Strömungsschaufeln kann dabei mit Vorteil so eingestellt werden, daß eine Transportbewegung der Feststoffe an der Zulaufseite erfolgt, wenn sie gerade durch den durch die Öffnungen wirkenden Druckimpuls der Räumer von der Trennwand abgehoben werden. Ein Zusetzen der Öffnungen in der Trennwand kann daher nicht auftreten.The effect of the flow blades can advantageously be adjusted so that a transport movement of the solids takes place on the inlet side when they are being lifted off the partition by the pressure impulse of the scrapers through the openings. A clogging of the openings in the partition can therefore not occur.
Eine geringe mechanische Beanspruchung des Faserstoffes kann aber gelegentlich auch erwünscht sein, solange keine zu starke Schmutzstoff-Zerkleinerung auftritt.A low mechanical stress on the fibrous material may occasionally be desirable as long as there is no excessive comminution of contaminants.
Die Erfindung und ihre Vorteile werden erläutert durch die Figuren 1 bis 4.The invention and its advantages are illustrated by FIGS. 1 to 4.
Dabei zeigen
- Fig. 1
- grob schematisch die Wirkung der erfindungsgemäßen Sortiervorrichtung,
- Fig. 2
- eine Siebvorrichtung mit ebener Trennwand,
- Fig. 3
- eine Detailansicht der in Fig. 2 gezeigten Vorrichtung,
- Fig. 4
- eine Siebvorrichtung mit zylindrischer Trennwand,
- Fig. 5
- eine Siebvorrichtung mit Rotoren von stark unterschiedlichen Durchmessern.
- Fig. 1
- roughly schematically the effect of the sorting device according to the invention,
- Fig. 2
- a screening device with a flat partition,
- Fig. 3
- 3 shows a detailed view of the device shown in FIG. 2,
- Fig. 4
- a screening device with a cylindrical partition,
- Fig. 5
- a screening device with rotors of very different diameters.
Die Fig. 1 zeigt in 3 Phasen (1a, 1b, 1c), grob schematisch dargestellt, ein Modell des erfindungsgemäßen Sortiervorgangs. Gemäß Fig. 1 a bewegen sich sowohl eine Strömungsschaufel 7 als auch ein Räumer 6 entlang einer als Trennelement dienenden Trennwand 3. Die Suspensionsströmung ist durch Pfeile 12 im Bereich der Öffnungen 2 angedeutet. Dort, wo gerade der Räumer 6 vorbeiläuft, bildet sich ein Druckimpuls aus, der eine Rückströmung durch die Öffnungen des Trennelements bewirkt. Man erkennt bereits das sich dem Trennelement nähemde Festteilchen 13. In Fig. 1 b hat sich das Festteilchen 13 an dasTrennelement 3 angesetzt und verstopft einen Teil der Öffnungen. Es nähert sich bereits die nächste Strömungsschaufel 7 sowie der nächste Räumer 6. Wie die Fig. 1 c zeigt, drückt der Druckimpuls des Räumers 6 das Festteilchen so weit vom Trennelement 3 ab, daß es durch die von der Schaufel 7 erzeugte Strömung fortbewegt werden kann.1 shows a model of the sorting process according to the invention in three phases (1a, 1b, 1c), shown roughly schematically. According to FIG. 1 a, both a
Die Fig. 2 stellt als Beispiel eine erfindungsgemäße Siebvorrichtung dar. Sie zeigt schematisch in seitlicher Schnittansicht ein die Suspension S aufnehmendes Gehäuse 1, welches als Trennelement eine Trennwand 3 enthält. Die Trennwand 3 weist eine Vielzahl von Öffnungen 2 (Fig. 3) auf. Der Suspensionsstrom, der durch die Öffnungen 2 die Trennwand 3 passieren kann, wird aus dem Gehäuse durch einen Stutzen als Gutstoff G herausgeleitet. Die Restmenge gelangt durch einen anderen Stutzen als Reject R ebenfalls aus dem Gehäuse 1. Im normalen Betrieb ist die Menge G sehr viel größer als die Menge R.2 shows an example of a screening device according to the invention. It shows schematically a side sectional view of a
Aufgrund der Wirkung der Trennwand kann man unterscheiden zwischen einer Zulaufseite 4 und einer Durchlaufseite 5. Auf der Durchlaufseite 5 sind die Räumer 6 als Teil eines Räumerrotors 8 sichtbar. Auch auf der Zulaufseite 4 der Trennwand 3 befinden sich Räummittel im weiteren Sinne, hier in Form von Strömungsschaufeln 7. Sie sind Teile eines Schaufelrotors 9, welcher - wie hier gezeichnet - durch eine Welle mit dem Räumerrotor 8 verbunden ist. Diese Verbindung ist aber nicht in jedem Fall erforderlich, wenn sie sich auch aus wirtschaftlichen Gründen zumeist empfiehlt.Due to the effect of the partition, a distinction can be made between an inlet side 4 and a through
Bei einer oben beschriebenen Verbindung der beiden Rotoren wird die Verbindungswelle hier zentral durch die Trennwand 3 geführt, wobei Abdichtteile 10 verwendet werden können Es kann allerdings auch sein, daß dort ein Spalt verbleibt, durch den ein Teil der Suspension strömen kann. Das wäre unschädlich, solange keine groben Teile in den Gußstoff gelangen und keine Blockierung dieses Zwischenraumes erfolgt.In the case of a connection of the two rotors described above, the connecting shaft is guided centrally through the dividing
Die Rotoren sind antreibbar, z.B. über eine Riemenscheibe 11. Ferner ist eine Lagerung 12 angedeutet.The rotors can be driven, e.g. via a
Fig. 3 stellt einen Ausschnitt der Fig. 2 dar und zeigt insbesondere, wie der Abstand A1 zwischen Strömungsschaufeln 7 und Trennwand 3 sowie der Abstand A2 zwischen Trennwand 3 und Räumer 6 definiert ist.3 shows a section of FIG. 2 and shows in particular how the distance A1 between
Als Besonderheit ist in der Figur 4 der Außendurchmesser des Rotors mit den Strömungsschaufeln 7' so gewählt, daß er geringfügig kleiner ist als der Innendurchmesser der ringförmigen gelochten Trennwand 3'. Dadurch läßt sich diese leicht, d.h. ohne Abbau des die Strömungsschaufeln 7' tragenden Rotors von der Zulaufseite 4 her ein- und ausbauen. Der Rotor selbst wird kleiner und damit billiger. Seine Wirkung reicht im Betrieb auch in den radial außerhalb liegenden Bereich, so daß durch Zusammenwirken mit den nah an der Trennwand 3' vorbeilaufenden Räumern 6 die Löcher freigehalten werden können.As a special feature, the outer diameter of the rotor with the flow blades 7 'is selected in FIG. 4 such that it is slightly smaller than the inner diameter of the annular perforated partition 3'. This makes it easy to Install and remove from the inlet side 4 without removing the rotor carrying the flow blades 7 '. The rotor itself becomes smaller and therefore cheaper. In operation, its effect also extends to the radially outside area, so that the holes can be kept free by interaction with the
Claims (12)
- A screening device for screening pulp suspension, in particular for separating off impurities from an aqueous suspension containing waste paper, with a housing (1) for receiving the pulp suspension to be treated, which device has as separating element a flat partition (3, 3') provided with openings (2) which serves for retaining solids on the inlet side owing to their size (4) and which allows water and pulp to pass to the far side (5), with rakers (6) which generate hydraulic pressure surges and which are movable on the far side (5) of the partition (3, 3') at a distance from and along the partition (3, 3') and with flow blades (7, 7') movable on the inlet side (5) [sic] of the partition (3, 3') at a distance therefrom,
characterised in that
the flow blades have a pumping action radially from the inside outwards and their raking effect is less intensive than that of the rakers (6) on the inlet side (4). - A screening device according to Claim 1,
characterised in that the flow blades (7, 7') movable on the inlet side (4) are in the form of conveying or pump blades. - A screening device according to Claim 1 or 2,
characterised in that the rakers (6) which are movable on the far side (5) of the partition (3, 3') have a hydrodynamic profile for producing pressure surges substantially transversely to the direction of movement. - A screening device according to one of Claims 1 to 3, characterised in that the distance (A1) of the flow blades (7, 7') located on the inlet side (4) from the partition (3, 3') is more than twice as large as the distance (A2) of the rakers (6) on the far side (5) of the partition (3, 3').
- A screening device according to one of Claims 1 to 4, characterised in that the rakers (6) belong to a raker rotor (8) and the flow blades (7, 7') to a blade rotor (9).
- A screening device according to Claim 5,
characterised in that the two rotors (8 and 9) are connected together and are driven at the same speed. - A screening device according to one of Claims 1 to 6, characterised in that the distance (A2) between the partition (3, 3') and the rakers (6) is between 0.5 and 3 mm.
- A screening device according to one of Claims 1 to 7, characterised in that the distance (A1) between the flow blades (7, 7') and the partition (3, 3') is between 20 and 50 mm.
- A screening device according to Claim 1,
characterised in that the partition (3') is in the shape of a circular ring and that the radially outer extent of the flow blade (7') is smaller than the internal diameter of the partition (3'). - A screening device according to Claim 1,
characterised in that the openings (2) are a plurality of cylindrical holes. - A screening device according to Claim 1,
characterised in that the openings (2) are a plurality of conical holes which widen in the direction of flow of the suspension. - A screening device according to Claim 1,
characterised in that the openings (2) are a plurality of slots.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4308225 | 1993-03-16 | ||
| DE4308225A DE4308225C1 (en) | 1993-03-16 | 1993-03-16 | Process for sorting fiber suspension and screening device for carrying it out |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0616072A1 EP0616072A1 (en) | 1994-09-21 |
| EP0616072B1 true EP0616072B1 (en) | 1997-06-18 |
Family
ID=6482861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94102519A Expired - Lifetime EP0616072B1 (en) | 1993-03-16 | 1994-02-19 | Process for screening a fibrous suspension and apparatus for its application |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5509536A (en) |
| EP (1) | EP0616072B1 (en) |
| AT (1) | ATE154650T1 (en) |
| DE (1) | DE4308225C1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6041035A (en) * | 1997-06-30 | 2000-03-21 | Rockwell Collins, Inc. | Open system modular electronics architecture |
| EP1059381B1 (en) * | 1999-06-09 | 2004-04-21 | Voith Paper Patent GmbH | Rotor for a pulper |
| KR100492517B1 (en) * | 2002-03-07 | 2005-06-03 | 장형수 | Manufacturing apparatus for bast fibers paper using bast fibers extracted from paper mulberry tree, manufacturing methode of the same and bast fibers paper thereby |
| US7188622B2 (en) * | 2003-06-19 | 2007-03-13 | 3M Innovative Properties Company | Filtering face mask that has a resilient seal surface in its exhalation valve |
| EP1777339B1 (en) * | 2005-10-19 | 2010-10-06 | Voith Patent GmbH | Screening device for paper pulp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE233493C (en) * | ||||
| US2480119A (en) * | 1946-02-25 | 1949-08-30 | Hervey G Cram | Disk pulp screen |
| US3456793A (en) * | 1966-01-24 | 1969-07-22 | Beloit Corp | Dual pressure stock screen |
| SE327328B (en) * | 1967-05-17 | 1970-08-17 | G Holm | |
| US3672506A (en) * | 1970-05-06 | 1972-06-27 | Jylhavaara Osakeyhtio | Pressure strainer device |
| GB1348347A (en) * | 1971-08-16 | 1974-03-13 | Burkhardt H H Kurtz H M | Apparatus for filtering a fibrous material suspension |
| FI51221C (en) * | 1972-06-21 | 1976-11-10 | Yhtyneet Paperitehtaat Oy | Pressure sieve device. |
| DE2750499C3 (en) * | 1977-11-11 | 1982-02-04 | Hermann Finckh, Maschinenfabrik GmbH & Co, 7417 Pfullingen | Sorter for fiber suspension |
| DE2830386C2 (en) * | 1978-07-11 | 1982-09-02 | Hermann Finckh, Maschinenfabrik GmbH & Co, 7417 Pfullingen | Process for sorting fiber suspensions and pressure sorters for carrying out the process |
| AT365676B (en) * | 1979-05-04 | 1982-02-10 | Escher Wyss Gmbh | PLANT FOR TREATING WASTE PAPER |
| AT378541B (en) * | 1981-03-23 | 1985-08-26 | Escher Wyss Gmbh | SORTING DEVICE FOR FABRIC SUSPENSIONS FOR PAPER PRODUCTION |
| US4543181A (en) * | 1982-12-16 | 1985-09-24 | Kamyr, Inc. | Medium consistency flat disk pressure screen |
| DE3320125A1 (en) * | 1983-06-03 | 1984-12-06 | J.M. Voith Gmbh, 7920 Heidenheim | METHOD AND DEVICE FOR PROCESSING WASTE PAPER |
| DE3322578C2 (en) * | 1983-06-14 | 1986-01-16 | Sulzer-Escher Wyss GmbH, 7980 Ravensburg | Sorting device |
| US4717471A (en) * | 1985-09-05 | 1988-01-05 | The Black Clawson Company | Apparatus for screening paper fiber stock |
| FI76139C (en) * | 1987-01-19 | 1988-09-09 | Ahlstroem Oy | Twigs separation method and apparatus |
| US5064537A (en) * | 1987-04-16 | 1991-11-12 | The Black Clawson Company | Seamless screen cylinder with laser cut openings |
| SE461104B (en) * | 1988-05-05 | 1990-01-08 | Kamyr Ab | DEVICE FOR DIVISION OF A SUSPENSION OF A FIBER-CELLULOUS CELLULOSAMASSA |
| FI80736B (en) * | 1989-02-16 | 1990-03-30 | Tampella Oy Ab | FOERFARANDE FOER SORTERING AV MASSASUSPENSION OCH SORTERINGSAPPARAT. |
| FR2663966A1 (en) * | 1990-07-02 | 1992-01-03 | Lamort Em | SORTING DEVICE FOR A MIXTURE OF PAPER PULP AND CONTAMINANTS. |
| DE9303811U1 (en) * | 1993-03-16 | 1993-04-29 | Sulzer-Escher Wyss GmbH, 7980 Ravensburg | Screening device for fiber suspension |
-
1993
- 1993-03-16 DE DE4308225A patent/DE4308225C1/en not_active Expired - Fee Related
-
1994
- 1994-02-19 EP EP94102519A patent/EP0616072B1/en not_active Expired - Lifetime
- 1994-02-19 AT AT94102519T patent/ATE154650T1/en not_active IP Right Cessation
- 1994-03-15 US US08/213,604 patent/US5509536A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ATE154650T1 (en) | 1997-07-15 |
| DE4308225C1 (en) | 1994-11-24 |
| US5509536A (en) | 1996-04-23 |
| EP0616072A1 (en) | 1994-09-21 |
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