EP1100605B1 - Thickener - Google Patents
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- Publication number
- EP1100605B1 EP1100605B1 EP99914409A EP99914409A EP1100605B1 EP 1100605 B1 EP1100605 B1 EP 1100605B1 EP 99914409 A EP99914409 A EP 99914409A EP 99914409 A EP99914409 A EP 99914409A EP 1100605 B1 EP1100605 B1 EP 1100605B1
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- EP
- European Patent Office
- Prior art keywords
- belt
- water
- set forth
- endless
- wire
- 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.)
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
- B30B9/241—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band co-operating with a drum or roller
Definitions
- the invention relates to a device for continuous mechanical thickening (Dewatering) of water-containing suspensions or sludges with the aid of a first endless Siebgewebebandes and a closed, smooth surface having moving in the running direction, endless pressing surface, wherein the to be drained Suspension cake is compressed between Siebgewebeband and pressing surface and a pressing pressure is created by the Siebgewebeband the cylindrical pressing surface under Longitudinal tension wraps around during the dewatering process.
- Dewatering continuous mechanical thickening
- Such a device is known for example from CH-A-644.414.
- This device uses only a single mesh belt, which partially surrounds a smooth roller.
- the advantage lies in the only one-sided rewet of the cake and the simpler Execution with only one band.
- the disadvantage is that the cake only at this a roller, d. H. drained only once to one side, so that the Final dry content is not optimal.
- the cake thickness to be dehydrated is limited, because the water of the roll side the way through the whole cake thickness must take to the mesh. Although this can be done by slower running of the press something be compensated.
- a generic device is also shown in EP-B-283,870, in addition a second endless belt acts on the first wire cloth belt.
- DE-A-4,216,968 discloses a generic device, wherein additionally a press pad is present, with adjustable pressure synchronously over a peripheral portion of Press roll runs along. The pressure pad acting at high pressure should rewet of the filter cake can be avoided.
- Such devices also serve to integrate into existing dewatering processes for the purpose of increasing the consistency of the solid, without losing the installation space or the operating effort to increase significantly.
- a pressing device with a shoe-pressing unit which forms a press nip together with a Gegenwaäze
- This known device is used for handling a traveling web, i. for smoothing or dewatering a paper web in a papermaking machine.
- Paper machine felts with their fine hair fleece for mark-free homogeneous Pressing worry, are not used in the patent idea. On the one hand, they pollute much easier and on the other hand, the uniform mark-free pressure in the present Invention not required; on the contrary, a marking, d. H. nonuniform Pressing is desirable, because it will exert a certain kneading effect, which is the Better drainage from the cake helps. In addition, it is in the present invention not desirable if the cake forms a stable sheet after thickening. at the patent idea is u. a.
- the suspension does not rest on the same mesh belt brought from a liquid phase to a consistency of about 25%, what is achieved with the invention.
- the aim of the invention is to avoid the disadvantages of the techniques used to date, that is, the pressing pressures acting on the suspension cake clearly and for long enough increase with minimal rewetting, in continuous flow operation.
- the washing process d. H. Separating fines from recyclable fiber material by dewatering a thin-layered low-consistency suspension ( ⁇ 2%) at higher Working speed (> 200 m / min.), Directly attached, with the addition used screen cloth belt with the corresponding belt guide rollers for both steps is used. Also eliminates the transport of the partially dewatered suspension from the scrubber to the thickener.
- the claims 5 and 8 are concerned with the high Eingesteifmaschine the tape to To unevenness of the cake to bridge or level by pressing, at the same time wallows the cake and thus promotes the drainage of crushed water.
- the sliding properties between band and Sliding surface also improved.
- the inherent rigidity of the band can be transverse to the Machine run be very high, as long as the longitudinal stiffness remains so low that the tape can follow the contours of the rollers and sliding surfaces well.
- Claims 12 to 14 show alternatives where the squeezed out water can flow or how this is removed from the press zone, so the squeezing process is not is hampered by a lack of swallowing volume.
- Claim 14 discloses that the still unstable filter cake is gradually put under increasing pressure by several tapes are added successively and only as the last stage of the high pressure of a pressure shoe is made.
- the claims 15-17 are dedicated to preventing the backflow of free water of the tapes into the cake when separating them from each other after the maximum pressing, because this would worsen the consistency achieved in the cake again.
- Claim 15 assumes that with rapid complete separation of all water-carrying tapes this water little time remains to be sucked back (application, especially at higher operating speeds).
- Claim 16 mainly intended for slow operation, assumes that although the 1st mesh belt on the cake remains a little while longer and can deliver its water to the cake, other water-bearing belts take away their water and do not remoisten. This is particularly secure if the band lying on the first sieve fabric belt hardly carries water with it. When the strips are placed under the cake, this effect becomes apparent when gravity prevents the backflow to the first wire cloth belt.
- a sieve cloth with a low absorption volume for the pressing water is selected, or this sieve is compressible under the pressing pressure, so that only a small amount of water adheres to it when leaving the pressing zone.
- Claims 18 to 22 show variants of how the pressing surface, against which the 1st sieve cloth tape presses the suspension cake, can be designed.
- Claim 20 shows a shoe roll with progressively narrowing radius of curvature, which is possible without differential speed and friction between roll mantle and Siebgewebeband.
- the claims 21 and 22 have a modified principle to the content in that the pressing surface in the press zone assumes a concave shape (shoe roll) and presses against a round roller.
- the basic principle of this invention is not necessarily bound to a basic spatial position of the components, it is in the execution of claims 21 and 22 of great use when the round counter-roller is arranged below the nip.
- Claim 22 advantageous. So squish water can also run counter to the direction of rotation. The removal of the bands after pressing is to be aimed at with decreasing slope, so that no white water can run back to the cake.
- a dewatering device in which the fiber suspension (12) with a distributor device (16) between a roller as a pressing surface (7) and a Siebgewebeband (1) is injected. Under the pressure of the Siebgewebebandes (1) and the centrifugal force, the suspension (12) is subjected to a first dewatering, whereby also fines of the suspension are intended washed out. The corresponding press water (14) is less and less with increasing thickening. By a second looping permeable belt (2) of the pressing pressure is increased, so that further pressing water (14) is squeezed out. Now, a third band (3), in this case an impermeable band, is also applied to the preceding bands by means of longitudinal tension and the pressing pressure is increased once more.
- a third band (3) in this case an impermeable band
- Fig. 2 the same dewatering device is shown as in Fig. 1, but instead with two further bands, here with an additional impermeable band (4), which is pressed by means of a sliding surface (5) of a pressure shoe (6).
- This Band (4) has volume of swallowing on the surface and therefore hurls that in it absorbed water (14) after Venassen the nip from. Both bands are simultaneously routed away from the suspension cake to rewet to minimize.
- Fig. 3 are also the same device as in Fig. 1 and 2. But the thickening is achieved by a combination of FIGS. 1 and 2, d. H. one second transmissive (2) and third impermeable band (4) are provided but the third band (4) is pressed by a sliding surface (5). This third Band (4) has no volume in this case, which is why no pressing water is thrown off this. The three bands (1, 2, 4) will turn simultaneously led away from the cake (13), but each in a different direction.
- FIG. 4 corresponds essentially to FIG. 3, but with the following differences: the third band (4) has again swallow volume and hurls water (14). In addition, the 1st Siebgewebeband is not simultaneously led away from the cake like the other two bands (2, 4), but still remains under longitudinal tension at the cake. During this stretch, the tissue is having a one-sided with Dry suction of the distance from the sieve positioned vacuum cleaner (17).
- Fig. 5 shows a sludge dewatering apparatus running very slowly (less than 10 m / min.), Which itself is provided with two screen belts (1, 2) and a number of belt guide rollers (11) for alternately passing the sludge after each one Dehydrate side.
- the device is then immediately integrated using one of the two Siebgewebebs (1).
- a smooth roller as a pressing surface (7), which is partially wrapped by the existing mesh belt (1).
- the second tape will not be used anymore because only one tape is needed.
- a pressing device now serves a third impermeable belt (4) and a pressure shoe (6) with sliding surface (5), wherein the band (4) has circumferential grooves.
- FIG. 6 illustrates a combination of FIGS. 1 and 5: Similar to FIG. 5, the cake and the first fabric belt wrap around the pressing surface (7), which itself does not consist of a round roller, but of a smooth, impermeable belt (4) guided by a pressure shoe (6) with sliding surface (5) becomes. As a special feature, this sliding surface is provided in the running direction with a progressively narrowing contour (R1 - R4), whereby the pressing pressure on the suspension cake steadily increases. Shown are dashed lines further bands (2, 3), which may be added in accordance with Fig. 1 in order to increase the pressing pressure even further.
- Fig. 7 also relates to the device of Fig. 5 and leaves there shown leadership of the 1st Siebgewebebandes. Only the two "rollers" (4, 7) reversed, whereby the impermeable belt with pressure shoe for smooth Pressing surface is (as Fig. 6), but with a concave sliding surface (5), to the here provided roll tube (8) to correspond as counter surface. The pressed water can flow radially through the holes introduced in the roller tube (8).
- This roller is also called solid roller with blind holes on the surface conceivable (10).
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum kontinuierlichen mechanischen Eindicken (Entwässern) von wasserhaltigen Suspensionen oder Schlämmen mit Hilfe eines ersten endlosen Siebgewebebandes und einer eine geschlossene, glatte Oberfläche aufweisenden, in Laufrichtung sich bewegenden, endlosen Preßfläche, wobei der zu entwässernde Suspensionskuchen zwischen Siebgewebeband und Preßfläche zusammengepreßt wird und ein Preßdruck dadurch entsteht, daß das Siebgewebeband die zylindrische Preßfläche unter Längsspannung während des Entwässerungsvorganges umschlingt.The invention relates to a device for continuous mechanical thickening (Dewatering) of water-containing suspensions or sludges with the aid of a first endless Siebgewebebandes and a closed, smooth surface having moving in the running direction, endless pressing surface, wherein the to be drained Suspension cake is compressed between Siebgewebeband and pressing surface and a pressing pressure is created by the Siebgewebeband the cylindrical pressing surface under Longitudinal tension wraps around during the dewatering process.
Eine derartige Vorrichtung ist beispielsweise aus der CH-A-644.414 bekannt. Diese Vorrichtung verwendet nur ein einziges Siebgewebeband, welches eine glatte Walze teilweise umspannt. Der Vorteil liegt in der nur einseitigen Rückfeuchtung des Kuchens und der einfacheren Ausführung mit nur einem Band. Nachteilig ist jedoch, daß der Kuchen nur an dieser einen Walze, d. h. nur ein Mal nach einer Seite hin entwässert werden kann, so daß der Endtrockengehalt nicht optimal ausfällt. Außerdem ist die zu entwässernde Kuchendicke begrenzt, weil auch das Wasser der Walzenseite den Weg durch die ganze Kuchendicke zum Siebgewebe nehmen muß. Dies kann zwar durch langsameren Lauf der Presse etwas kompensiert werden.Such a device is known for example from CH-A-644.414. This device uses only a single mesh belt, which partially surrounds a smooth roller. The advantage lies in the only one-sided rewet of the cake and the simpler Execution with only one band. The disadvantage, however, is that the cake only at this a roller, d. H. drained only once to one side, so that the Final dry content is not optimal. In addition, the cake thickness to be dehydrated is limited, because the water of the roll side the way through the whole cake thickness must take to the mesh. Although this can be done by slower running of the press something be compensated.
Eine gattungsgemäße Vorrichtung ist ferner der EP-B-283.870 zu entnehmen, wobei zusätzlich ein zweites endloses Band auf das erste Siebgewebeband wirkt. Auch die DE-A-4.216.968 offenbart eine gattungsgemäße Vorrichtung, wobei zusätzlich ein Preßkissen vorhanden ist, das mit einstellbarem Druck synchron über einem Umfangsabschnitt der Preßwalze mitläuft. Dabei soll das bei hohem Druck wirkende Preßkissen eine Rückbefeuchtung des Filterkuchens vermieden werden.A generic device is also shown in EP-B-283,870, in addition a second endless belt acts on the first wire cloth belt. Also DE-A-4,216,968 discloses a generic device, wherein additionally a press pad is present, with adjustable pressure synchronously over a peripheral portion of Press roll runs along. The pressure pad acting at high pressure should rewet of the filter cake can be avoided.
Derartige Vorrichtungen dienen auch der Integration in vorhandene Entwässerungsverfahren zwecks Erhöhung der Feststoffkonsistenz, ohne dabei den Bauraum oder den Bedienaufwand wesentlich zu vergrößern. Such devices also serve to integrate into existing dewatering processes for the purpose of increasing the consistency of the solid, without losing the installation space or the operating effort to increase significantly.
Noch eine aus "Winkelpresse" von Bellmer von 1972 bekannten Vorrichtung führt den Suspensionskuchen zwischen zwei Siebgewebebändern; dies hat den Vorteil, daß der Kuchen sich nach zwei Seiten entwässern läßt, indem dieses Sandwich mäanderförmig um Leitwalzen herum geführt wird, so daß die Abfuhr von Quetschwasser von der umschlungenen Walze weg durch das jeweils außenliegende Siebgewebeband erfolgt. So kann auch der Durchmesser der Leitwalzen im Verlaufe der Umführungen jeweils verkleinert werden, was die Pressung steigert. Es zeigt sich aber als gravierender Nachteil, daß das in den Maschen beider Siebgewebe durch Adhäsionskräfte verbleibende Wasser, beim Verlassen der Preßzone, wieder in den Kuchen zurückströmt, da die Adhäsionskräfte der Suspension infolge feinerer Faser- und Partikelgrößen stärker sind und damit zurücksaugend wirken.Another device known from Bellmer's "Winkelpress" of 1972 carries the suspension cake between two mesh belts; This has the advantage that the cake can be drained to two sides by meandering this sandwich around guide rollers is guided around, so that the discharge of crushed water from the entwined Roll away through the respective outer mesh belt. So can the Diameter of the guide rollers in the course of the bypasses each be reduced, which the pressure increases. But it turns out as a serious disadvantage that in the mesh both sieve fabrics remaining water by adhesion forces, when leaving the nip, flows back into the cake, as the adhesion of the suspension due finer fiber and particle sizes are stronger and thus sucked back.
Aber es können die Leitwalzendurchmesser nicht beliebig verkleinert werden, da Festigkeit und Durchbiegung der Leitwalzen dies verhindern.But it can not be arbitrarily reduced the Leitwalzendurchmesser, since strength and deflection of the guide rollers prevent this.
Eine weitere Möglichkeit, die Preßkräfte zu steigern, liegt darin, die Längsspannung der Siebgewebebänder zu erhöhen; auch hier setzen Festigkeit und Durchbiegung der Leitwalzen sowie die Festigkeit der Siebgewebebänder selbst Grenzen für Steigerung des Trokkengehaltes nach der Pressung. In der Praxis liegen die Siebspannungen in der Größenordnung von 10 N/mm, selten bis 30 N/mm, was bei einem kleinen Walzendurchmesser von z. B. 200 mm einen Preßdruck von ca. 1 bar, selten 2 bar, ergibt Beide Möglichkeiten verhindern aber nicht die Rückfeuchtung durch das Wasser in den Siebmaschen beider Siebgewebe. Eine optimale Leistung ist also nicht möglich: Endtrockengehalt oder Durchsatzmenge stehen gegeneinander.Another way to increase the pressing forces, lies in the longitudinal tension of the To increase screen cloth belts; here too set strength and deflection of the guide rollers as well as the strength of Siebgewebebänder itself limits for increasing the dry content after the squeeze. In practice, the straining stresses are of the order of magnitude of 10 N / mm, rarely up to 30 N / mm, resulting in a small roll diameter of z. B. 200 mm, a pressure of about 1 bar, rarely 2 bar, results in both ways prevent but not the rewetting by the water in the sieve meshes of both meshes. Optimum performance is therefore not possible: final dry content or throughput stand against each other.
Aus der DE-U-9.203.395 ist eine Preßvorrichtung mit einer Schuh-Preßeinheit bekannt, die zusammen mit einer Gegenwaäze einen Preßspalt bildet Diese bekannte Vorrichtung dient zur Behanldung einer laufenden Warenbahn, d.h. zum Glätten oder Entwässern einer Papierbahn in einer Papierherstellungsmaschine.From DE-U-9.203.395 a pressing device with a shoe-pressing unit is known which forms a press nip together with a Gegenwaäze This known device is used for handling a traveling web, i. for smoothing or dewatering a paper web in a papermaking machine.
Grundsätzliche Unterschiede zum Gegenstand dieser Erfindung bestehen dabei darin, daß bei Papier die Qualität der zu entwässernden Bahn zu beachten ist, d. h. daß die ankommende Bahn sehr homogen ist, daß die Pressung mit markier-unempfindlichen Filzen erfolgt, daß kein Verdrücken der Bahn passieren darf, d. h. Verschieben von Fasern, daß sich das ausgepreßte Wasser nicht gegen die Laufrichtung der Papierbahn bewegen darf, da sonst die Papierbahn zerstört wird, und daß insgesamt die Qualität, d. h. die Gleichförmigkeit der entwässerten Papierbahn gewährleistet sein muß.Fundamental differences from the subject matter of this invention consist in the fact that in the case of paper, the quality of the web to be drained has to be taken into account, d. H. that the incoming Web is very homogeneous, that the pressing takes place with mark insensitive felt, that no crushing of the web may happen, d. H. Moving fibers that are the squeezed out water must not move against the direction of the paper web, since otherwise the paper web is destroyed, and that overall the quality, d. H. the uniformity the dewatered paper web must be guaranteed.
Papiermaschinenfilze, die mit ihrem feinen Haarvlies für die markierungsfreie homogene Pressung sorgen, werden bei der Patentidee nicht eingesetzt. Einerseits verschmutzen sie viel leichter und andererseits ist die gleichförmige markierungsfreie Pressung bei der vorliegenden Erfindung gar nicht erforderlich; im Gegenteil, eine markierende, d. h. ungleichförmige Pressung ist erwünscht, denn sie wird eine gewisse Knetwirkung ausüben, was dem besseren Wasserabfluß aus dem Kuchen hilft. Außerdem ist es bei der vorliegenden Erfindung nicht erwünscht, wenn der Kuchen nach dem Eindicken eine stabile Bahn bildet. Bei der Patentidee ist u. a. durch beabsichtigte Differenzgeschwindigkeit zwischen Siebgewebe und Preßfläche zu beiden Seite den Kuchens und/oder durch die gröbere Struktur der zusätzlichen wasserdurchlässigen Bänder eine Zerstörung der Bahnstruktur beabsichtigt, um dem Wasser beim Ausquetschvorgang Wege freizumachen für leichteres Abströmen und um ein Zerbröseln nach dem Eindicken zu erreichen.Paper machine felts, with their fine hair fleece for mark-free homogeneous Pressing worry, are not used in the patent idea. On the one hand, they pollute much easier and on the other hand, the uniform mark-free pressure in the present Invention not required; on the contrary, a marking, d. H. nonuniform Pressing is desirable, because it will exert a certain kneading effect, which is the Better drainage from the cake helps. In addition, it is in the present invention not desirable if the cake forms a stable sheet after thickening. at the patent idea is u. a. by intended differential speed between screen mesh and pressing surface to both sides of the cake and / or by the coarser structure of the additional ones water-permeable belts intended to destroy the railway structure to clear away the water during the squeezing process for easier outflow and to achieve crumbling after thickening.
Außerdem wird bei Papier- und Kartonbahnen die Suspension nicht auf dem selben Siebgewebeband von einer flüssigen Phase bis zu einer Konsistenz von über ca. 25 % gebracht, was mit der Erfindung erreicht wird.In addition, in paper and board webs, the suspension does not rest on the same mesh belt brought from a liquid phase to a consistency of about 25%, what is achieved with the invention.
Ziel der Erfindung ist es, die Nachteile der bis heute angewandten Techniken zu vermeiden, also die auf den Suspensionskuchen einwirkenden Preßdrücke deutlich und lange genug zu erhöhen bei minimaler Rückfeuchtung, und zwar im kontinuierlichen Durchlaufbetrieb.The aim of the invention is to avoid the disadvantages of the techniques used to date, that is, the pressing pressures acting on the suspension cake clearly and for long enough increase with minimal rewetting, in continuous flow operation.
Die Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst. Aufgrund dieser
Ausbildung ergeben sich wirtschaftlich interessante Lösungen: The object is solved by the features of
Bei der Eindickung von Altpapiersuspension kann die Erfindung dem Waschprozeß, d. h. Separieren von Feinstoffen vom wiederverwertbaren Fasermaterial mittels Entwässerung einer dünnschichtigen niedrigkonsistenten Suspension (< 2 %) bei höherer Arbeitsgeschwindigkeit (>200 m/min.), direkt angehängt werden, wobei das dazu verwendete Siebgewebeband mit den entsprechenden Bandleitwalzen für beide Schritte eingesetzt wird. Auch entfällt der Transport der teilentwässerten Suspension vom Wäscher zum Eindicker.In the thickening of waste paper suspension, the invention, the washing process, d. H. Separating fines from recyclable fiber material by dewatering a thin-layered low-consistency suspension (<2%) at higher Working speed (> 200 m / min.), Directly attached, with the addition used screen cloth belt with the corresponding belt guide rollers for both steps is used. Also eliminates the transport of the partially dewatered suspension from the scrubber to the thickener.
Die Eindickung von Schlämmen mittels der Doppelsiebpressen wird, durch Integration der
Erfindung in den bekannten Prozeß (Eingangskonsistenz > 2 % bei Arbeitsgeschwindigkeit
< 10 m/min.), zu geringerem Wassergehalt des mechanisch entwässerten Kuchens führen.
Dies ist von hohem gesamtwirtschaftlichen Nutzen:
heutzutage entstehen hohe Kosten für den Abtransport der eingedickten Schlämme und für
den dann notwendigen Deponieraum bzw. die Trocknung oder Verbrennung, da 2/3 bis 3/4
des Volumens aus Wasser besteht. Bei Reduktion des Wassergehaltes sind diese Kosten
direkt positiv betroffen.
Vorteilhafte Ausgestaltungen der Patentidee sollen die Wirksamkeit und Anwendungsbreite
erhöhen. Der Anwendung bei nicht sehr gleichförmig verteiltem Suspensionskuchen und der
Vermeidung von Rückbefeuchtung beim Trennen von fertig eingedicktem Kuchen und
erstern Siebgewebe wird besonderes Augenmerk geschenkt.The thickening of sludges by means of the twin-wire presses, by integration of the invention in the known process (input consistency> 2% at working speed <10 m / min.), To lower water content of the mechanically dewatered cake. This is of high overall economic benefit:
Nowadays, there are high costs for the removal of the thickened sludge and for the then necessary landfill space or the drying or combustion, since 2/3 to 3/4 of the volume consists of water. When reducing the water content, these costs are directly positively affected.
Advantageous embodiments of the patent idea to increase the effectiveness and scope. The application of not very uniformly distributed suspension cake and the avoidance of rewetting when separating finished thickened cake and former sieve fabric is given special attention.
Die Ansprüche 3 - 6 behandeln unterschiedliche Bandkonstruktionen, die den Durchtritt des
ausgepreßten Wassers ermöglichen. Dabei wird in Anspruch 7 ein Band beansprucht,
welches kein Wasser in seinen Hohlräumen festhält und folglich dieses Wasser auch nicht
rückbefeuchten kann.The claims 3 - 6 treat different band constructions, the passage of the
allow squeezed out water. It is claimed in
Die Ansprüche 5 und 8 beschäftigen sich mit der hohen Eingesteifigkeit des Bandes, um
Unebenheiten des Kuchens zu überbrücken oder per Pressung einzuebnen, was gleichzeitig
den Kuchen walkt und damit den Abfluß von Quetschwasser fördert.The
Bei Anwendung eines Preßschuhs mit hydrostatischer oder hydrodynamischer Schmierung werden die Gleiteigenschaften zwischen Band und Gleitfläche ebenfalls verbessert. Die Eigensteifigkeit des Bandes kann in Querrichtung zum Maschinenlauf sehr hoch sein, solange die Längssteifigkeit so gering bleibt, daß das Band den Konturen der Walzen und Gleitflächen gut folgen kann.When using a press shoe with hydrostatic or hydrodynamic lubrication, the sliding properties between band and Sliding surface also improved. The inherent rigidity of the band can be transverse to the Machine run be very high, as long as the longitudinal stiffness remains so low that the tape can follow the contours of the rollers and sliding surfaces well.
Die Ansprüche 12 bis 14 zeigen Alternativen auf, wohin das ausgepreßte Wasser fließen kann
bzw. wie dieses aus der Preßzone abtransportiert wird, damit der Auspreßvorgang nicht
durch mangelndes Schluckvolumen behindert wird.
Anspruch 14 offenbart, daß der noch instabile Filterkuchen schrittweise unter steigenden
Druck gesetzt wird, indem mehrere Bänder nacheinander hinzugefügt werden und erst als
letzte Stufe der hohe Preßdruck eines Anpreßschuhs erfolgt.
Die Ansprüche 15-17 widmen sich der Verhinderung des Rückflusses von freiem Wasser
der Bänder in den Kuchen beim Trennen derselben voneinander nach der maximalen
Pressung, weil dies die erreichte Konsistenz im Kuchen wieder verschlechtern würde.
Anspruch 15 geht davon aus, daß bei rascher vollständiger Trennung aller wasserführenden
Bänder diesem Wasser wenig Zeit verbleibt, zurückgesaugt zu werden (Anwendung vor
allem bei höherer Betriebsgeschwindigkeit).
The claims 15-17 are dedicated to preventing the backflow of free water of the tapes into the cake when separating them from each other after the maximum pressing, because this would worsen the consistency achieved in the cake again.
Anspruch 16, hauptsächlich für langsamen Betrieb vorgesehen, geht davon aus, daß zwar
das 1. Siebgewebeband auf dem Kuchen eine kleine Weile länger verbleibt und sein Wasser
an den Kuchen abgeben kann, aber weitere wasserführende Bänder nehmen ihr Wasser mit
weg und rückbefeuchten nicht.
Besonders gesichert ist dies, wenn das auf dem 1. Siebgewebeband
liegende Band kaum Wasser mit sich führt. Bei Anordnung der Bänder bei der Trennung
unterhalb des Kuchens wird dieser Effekt deutlich, wenn die Schwerkraft den Rückfluß zum
1. Siebgewebeband verhindert.
This is particularly secure if the band lying on the first sieve fabric belt hardly carries water with it. When the strips are placed under the cake, this effect becomes apparent when gravity prevents the backflow to the first wire cloth belt.
Soll die Rückbefeuchtung durch das 1. Siebgewebeband selbst gering gehalten werden, gibt
es zwei Möglichkeiten:
Man wählt dafür ein Siebgewebe mit geringem Schluckvolumen für das Preßwasser, bzw.
dieses Sieb ist unter dem Preßdruck komprimierbar, so daß nur eine geringe Wassermenge
beim Verlassen der Preßzone darin haftet.
Oder man entfernt nach Anspruch 17 das Wasser aus den Siebmaschen nach Verlassen
der Preßzone vor Abheben des Siebes vom Suspensionskuchen. Dies kann durch
tangentiales Aufbringen eines flächigen Wasserstrahles auf das Siebgewebe erfolgen, wobei
die höhere Strahlgeschwindigkeit mit ihrer kinetischen Energie das Wasser aus den
Siebmaschen reißt. Das gleiche kann durch Aufblasen eines Luftstrahls geschehen. Diese
beiden Methoden sind aber nicht sehr handlich, da das abfliegende Wasser wieder
aufgefangen werden muß. Sinnvoller ist deshalb ein Rohrsauger, der mit einer Längsleiste
einen Spalt zum Sieb bildet, durch den die Saugluft hindurchströmt. Hierbei wird das Wasser
aus dem Sieb herausgerissen und gleich mit der Saugluft durch den Rohrsauger abgeführt.
Die Ansprüche 18 bis 22 zeigen Varianten, wie die Preßfläche, gegen die das
1. Siebgewebeband den Suspensionskuchen preßt, gestaltet werden kann. Anspruch 20
zeigt eine Schuhwalze mit progressiv enger werdendem Krümmungsradius, was ohne
Differenzgeschwindigkeit und Reibung zwischen Walzenmantel und Siebgewebeband
möglich ist.If the rewetting by the 1st mesh belt itself is to be kept low, there are two possibilities:
For this purpose, a sieve cloth with a low absorption volume for the pressing water is selected, or this sieve is compressible under the pressing pressure, so that only a small amount of water adheres to it when leaving the pressing zone. Or one removes according to
Die Ansprüche 21 und 22 haben ein abgewandeltes Prinzip zum Inhalt, indem die Preßfläche
in der Preßzone eine konkave Form einnimmt (Schuhwalze) und gegen eine runde Walze
preßt.
Obwohl das Grundprinzip dieser Erfindung nicht unbedingt an eine grundsätzliche räumliche
Lage der Bauelemente gebunden ist, ist es bei der Ausführung der Ansprüche 21 und 22 von
großem Nutzen, wenn die runde Gegenwalze unterhalb der Preßzone angeordnet ist. Damit
ist der Ablauf des Preßwassers am einfachsten. Besonders bei der niedrigen
Betriebsgeschwindigkeit beim Entwässern von Schlamm ist dies entspr. Anspruch 22
vorteilhaft. So kann Quetschwasser auch entgegen der Drehrichtung ablaufen.
Das Wegführen der Bänder nach der Pressung ist mit fallender Neigung anzustreben, damit
kein Siebwasser zum Kuchen zurücklaufen kann. The claims 21 and 22 have a modified principle to the content in that the pressing surface in the press zone assumes a concave shape (shoe roll) and presses against a round roller.
Although the basic principle of this invention is not necessarily bound to a basic spatial position of the components, it is in the execution of claims 21 and 22 of great use when the round counter-roller is arranged below the nip. Thus, the flow of the Preßwassers is the easiest. Especially at the low operating speed when dewatering of sludge this is entspr. Claim 22 advantageous. So squish water can also run counter to the direction of rotation.
The removal of the bands after pressing is to be aimed at with decreasing slope, so that no white water can run back to the cake.
Der Erfindungsgedanke wird im folgenden anhand von vereinfacht und schematisch dargestellten Ausführungsbeispielen unter Bezugnahme auf die Zeichnungen näher erläutert. Dabei zeigen nur die Figuren 3 und 4 Ausführungen gemäss Patentanspruch 1. Die anderen Figuren dienen zur Erläuterung der abhängigen Ansprüche.
- Fig. 1
- zeigt die Darstellung einer Entwässerungseinrichtung unter Verwendung mehrerer Bänder und einer Walze als Preßfläche;
- Fig. 2
- zeigt die Verwendung eines undurchlässigen Bandes mit Anpreßschuh;
- Fig. 3
- zeigt die Verwendung mehrerer Bänder und eines undurchlässigen Bandes mit Anpreßschuh bei einer erfindungsgemässen Ausführung;
- Fig. 4
- zeigt Fig. 3, allerdings mit Verbleib des 1. Siebgewebebandes am Suspensionskuchen auch nach der verstärkten Pressung bei einer erfindungsgemässen Ausführung;
- Fig. 5
- zeigt die Darstellung einer Entwässerungseinrichtung für langsame Entwässerungsgeschwindigkeit und dicken Suspensionskuchen mit Ablauf von Quetschwasser auch gegen die Laufrichtung;
- Fig. 6
- zeigt die progressive Entwässerung durch ein oder mehrere Bänder unter Anwendung eines sich verkleinernden Krümmungsradiusses der glatten Preßfläche;
- Fig. 7
- zeigt die Pressung an einem perforierten Walzenrohr;
- Fig. 8
- zeigt ähnlich Fig. 7 die Pressung an einer Walze mit Umfangsrillung;
- Fig. 1
- shows the representation of a dewatering device using a plurality of belts and a roller as a pressing surface;
- Fig. 2
- shows the use of an impermeable belt with pressure shoe;
- Fig. 3
- shows the use of multiple bands and an impermeable belt with pressure shoe in an inventive embodiment;
- Fig. 4
- 3, but with the whereabouts of the first Siebgewebebandes on the suspension cake even after the increased pressure in an inventive embodiment;
- Fig. 5
- shows the representation of a dewatering device for slow dewatering rate and thick suspension cake with expiration of crushed water also against the direction of travel;
- Fig. 6
- Figure 3 shows progressive drainage through one or more belts using a decreasing radius of curvature of the smooth pressing surface;
- Fig. 7
- shows the pressure on a perforated roller tube;
- Fig. 8
- similar to Figure 7 shows the pressure on a roll with Umfangsrillung.
In Fig. 1 ist eine Entwässerungseinrichtung dargestellt, bei der die Fasersuspension
(12) mit einer Verteilvorrichtung (16) zwischen eine Walze als Preßfläche (7) und ein
Siebgewebeband (1) eingespritzt wird. Unter dem Preßdruck des
Siebgewebebandes (1) und der Fliehkraft wird die Suspension (12) einer ersten
Entwässerung unterzogen, wobei auch Feinstoffe der Suspension beabsichtigt
ausgewaschen werden. Das entsprechende Preßwasser (14) wird mit zunehmender
Eindickung immer weniger. Durch ein zweites umschlingendes durchlässiges Band
(2) wird der Preßdruck erhöht, so daß weiteres Preßwasser (14) ausgequetscht wird.
Nun wird ein drittes Band (3), in diesem Falle ein undurchlässiges Band, ebenfalls
auf die vorausgehenden Bänder mittels Längsspannung aufgebracht und der
Preßdruck wird ein weiteres Mal erhöht. Es ist nun offengelassen, ob die nun
ausgepreßte Wassermenge in den Hohlräumen der ersten beiden Bänder (1, 2)
noch aufgenommen werden kann oder ob dafür ein Schluckvolumen, z. B. Rillen
oder Blindbohrungen an der Außenseite des 3. Bandes (3) vorhanden sind. Am
Ende der dreistufigen Pressung verlassen alle drei Bänder (1, 2, 3) die Preßfläche
(7) gemeinsam und trennen sich erst auf der Bandleitwalze (11). Danach werden alle
drei Bänder auf nicht dargestellte Weise vom Wasser befreit und gereinigt. Der
eingedickte Suspensions-Kuchen (13) haftet an der Preßfläche (7) und wird von
einem Schaber (15) abgenommen. Die beiden Bänder (2, 3) sind
der bekannten Vorrichtung hinzugefügt worden, um den Wassergehalt des
Suspensions-Kuchen (13) zu verringern.
Die dargestellte Einrichtung läuft mit Geschwindigkeit über 200 m/min.In Fig. 1, a dewatering device is shown in which the fiber suspension (12) with a distributor device (16) between a roller as a pressing surface (7) and a Siebgewebeband (1) is injected. Under the pressure of the Siebgewebebandes (1) and the centrifugal force, the suspension (12) is subjected to a first dewatering, whereby also fines of the suspension are intended washed out. The corresponding press water (14) is less and less with increasing thickening. By a second looping permeable belt (2) of the pressing pressure is increased, so that further pressing water (14) is squeezed out. Now, a third band (3), in this case an impermeable band, is also applied to the preceding bands by means of longitudinal tension and the pressing pressure is increased once more. It is now left open whether the now squeezed amount of water in the cavities of the first two bands (1, 2) can still be recorded or whether for a swallow volume, z. B. grooves or blind holes on the outside of the third band (3) are present. At the end of the three-stage pressing all three bands (1, 2, 3) leave the pressing surface (7) together and separate only on the band guide roller (11). Thereafter, all three bands are freed from water in a manner not shown and cleaned. The thickened suspension cake (13) adheres to the pressing surface (7) and is removed by a scraper (15). The two bands (2, 3) have been added to the known device to reduce the water content of the suspension cake (13).
The device shown runs at speeds above 200 m / min.
In Fig. 2 ist die gleiche Entwässerungseinrichtung gezeigt wie in Fig. 1, jedoch statt mit zwei weiteren Bändern, hier mit einem zusätzlichen undurchlässigen Band (4), welches mittels einer Gleitfläche (5) eines Anpreßschuhs (6) angepreßt wird. Dieses Band (4) hat Schluckvolumen auf der Oberfläche und schleudert deshalb das darin aufgenommene Wasser (14) nach Venassen der Preßzone ab. Beide Bänder werden gleichzeitig vom Suspensions-Kuchen weggeleitet, um die Rückbefeuchtung zu minimieren.In Fig. 2, the same dewatering device is shown as in Fig. 1, but instead with two further bands, here with an additional impermeable band (4), which is pressed by means of a sliding surface (5) of a pressure shoe (6). This Band (4) has volume of swallowing on the surface and therefore hurls that in it absorbed water (14) after Venassen the nip from. Both bands are simultaneously routed away from the suspension cake to rewet to minimize.
In Fig. 3 handelt es sich ebenfalls um die gleiche Einrichtung wie in Fig. 1 und 2. Aber die Eindickung wird erreicht durch eine Kombination aus Fig. 1 und 2, d. h. ein zweites durchlässiges (2) und ein drittes undurchlässiges Band (4) sind vorgesehen, aber das dritte Band (4) wird durch eine Gleitfläche (5) angepreßt. Dieses dritte Band (4) hat in diesem Falle kein Schluckvolumen, weshalb auch kein Preßwasser von diesem abgeschleudert wird. Die drei Bänder (1, 2, 4) werden wiederum gleichzeitig vom Kuchen (13) weggeleitet, aber jedes in eine andere Richtung.In Fig. 3 are also the same device as in Fig. 1 and 2. But the thickening is achieved by a combination of FIGS. 1 and 2, d. H. one second transmissive (2) and third impermeable band (4) are provided but the third band (4) is pressed by a sliding surface (5). This third Band (4) has no volume in this case, which is why no pressing water is thrown off this. The three bands (1, 2, 4) will turn simultaneously led away from the cake (13), but each in a different direction.
Die Fig. 4 entspricht im wesentlichen der Fig. 3, aber mit folgenden Unterschieden: das dritte Band (4) hat wieder Schluckvolumen und schleudert Wasser ab (14). Außerdem wird das 1. Siebgewebeband nicht gleichzeitig vom Kuchen weggeführt wie die beiden anderen Bänder (2, 4), sondern verbleibt noch unter Längsspannung am Kuchen. Während dieser Strecke wird das Gewebe mit einem einseitig mit Abstand vom Sieb positionierten Rohrsauger (17) trockengesaugt.FIG. 4 corresponds essentially to FIG. 3, but with the following differences: the third band (4) has again swallow volume and hurls water (14). In addition, the 1st Siebgewebeband is not simultaneously led away from the cake like the other two bands (2, 4), but still remains under longitudinal tension at the cake. During this stretch, the tissue is having a one-sided with Dry suction of the distance from the sieve positioned vacuum cleaner (17).
Fig. 5 zeigt eine sehr langsam (unter 10 m/min.) laufende Schlammentwässerungs-Einrichtung,
die selber mit zwei Siebgewebebändern (1, 2) und einer Anzahl von
Bandleitwalzen (11) versehen ist, um den Schlamm bei jeder Umschlingung
abwechselnd nach jeder Seite zu entwässern.
Hier ist vorteilhafterweise die Vorrichtung gleich anschließend unter
Verwendung eines der beiden Siebgewebebänder (1) integriert. Hinzu kommt eine
glatte Walze als Preßfläche (7), die vom vorhandenen Siebgewebeband (1) teilweise
umschlungen wird. Das zweite Band wird nicht weiter verwendet, da
nur ein Band notwendig ist. Als Preßeinrichtung dient nun ein
drittes undurchlässiges Band (4) und ein Anpreßschuh (6) mit Gleitfläche (5), wobei
das Band (4) Umfangsrillen besitzt. Fig. 5 shows a sludge dewatering apparatus running very slowly (less than 10 m / min.), Which itself is provided with two screen belts (1, 2) and a number of belt guide rollers (11) for alternately passing the sludge after each one Dehydrate side.
Here, advantageously, the device is then immediately integrated using one of the two Siebgewebebänder (1). In addition, a smooth roller as a pressing surface (7), which is partially wrapped by the existing mesh belt (1). The second tape will not be used anymore because only one tape is needed. As a pressing device now serves a third impermeable belt (4) and a pressure shoe (6) with sliding surface (5), wherein the band (4) has circumferential grooves.
Dadurch ist es möglich, jede anfallende Preßwassermenge (14) in oder entgegen der Laufrichtung abzuleiten. Restwasser im Band (1) läuft ebenfalls nicht mehr zum Kuchen zurück, da das Band (1) fallend weggeleitet wird. Der an der Preßfläche (7) klebende Kuchen (13) wird vom Schaber (15) abgenommen.This makes it possible, each accumulating Preßwassermenge (14) in or against Derive the direction. Residual water in the belt (1) is also no longer running Cake back, as the tape (1) is led away falling. The at the pressing surface (7) Adhesive cake (13) is removed from the scraper (15).
Fig. 6 stellt eine Kombination aus Fig. 1 und 5 dar:
Kuchen und 1. Siebgewebeband umschlingen ähnlich Fig. 5 die Preßfläche (7), die
selbst aber nicht aus einer runden Walze besteht, sondern aus einem glatten,
undurchlässigen Band (4), welches von einem Anpreßschuh (6) mit Gleitfläche (5)
geführt wird. Als Besonderheit ist diese Gleitfläche in Laufrichtung mit einer
progressiv enger werdenden Kontur (R1 - R4) versehen, wodurch der Preßdruck auf
den Suspensions-Kuchen stetig zunimmt.
Gestrichelt dargestellt sind weitere Bänder (2, 3), die entsprechend Fig. 1
hinzukommen können, um den Preßdruck noch weiter zu erhöhen.FIG. 6 illustrates a combination of FIGS. 1 and 5:
Similar to FIG. 5, the cake and the first fabric belt wrap around the pressing surface (7), which itself does not consist of a round roller, but of a smooth, impermeable belt (4) guided by a pressure shoe (6) with sliding surface (5) becomes. As a special feature, this sliding surface is provided in the running direction with a progressively narrowing contour (R1 - R4), whereby the pressing pressure on the suspension cake steadily increases.
Shown are dashed lines further bands (2, 3), which may be added in accordance with Fig. 1 in order to increase the pressing pressure even further.
Fig. 7 bezieht sich ebenfalls auf die Einrichtung nach Fig. 5 und beläßt die dort gezeigte Führung des 1. Siebgewebebandes. Lediglich werden die beiden "Walzen" (4, 7) vertauscht, wodurch das undurchlässige Band mit Anpreßschuh zur glatten Preßfläche wird (wie Fig. 6), allerdings mit konkaver Gleitfläche (5), um dem hier vorgesehenen Walzenrohr (8) als Gegenfläche zu entsprechen. Das Preßwasser kann radial durch die im Walzenrohr (8) eingebrachten Bohrungen abfließen.Fig. 7 also relates to the device of Fig. 5 and leaves there shown leadership of the 1st Siebgewebebandes. Only the two "rollers" (4, 7) reversed, whereby the impermeable belt with pressure shoe for smooth Pressing surface is (as Fig. 6), but with a concave sliding surface (5), to the here provided roll tube (8) to correspond as counter surface. The pressed water can flow radially through the holes introduced in the roller tube (8).
In Fig. 8 ist im Gegensatz zu Fig. 7 das Walzenrohr (8) durch eine massive Walze mit Umfangsrillen (9) ersetzt. Also kann das Wasser wie in Fig. 5 tangential nach beiden Richtungen ablaufen.In Fig. 8, in contrast to Fig. 7, the roller tube (8) by a solid roller with circumferential grooves (9) replaced. So the water can tangentially as in Fig. 5 proceed in both directions.
Diese Walze ist auch als massive Walze mit Blindbohrungen an der Oberfläche denkbar (10). This roller is also called solid roller with blind holes on the surface conceivable (10).
Auch ist hier wieder ein weiteres Band gestrichelt dargestellt, falls der Banddruck vor der Schuhpressung (6) bereits erhöht werden soll.Also here is another band shown in dashed lines, if the tape printing before the shoe press (6) should already be increased.
Claims (21)
- An apparatus for continuous mechanical thickening (dewatering) aqueous suspensions or slurries with the aid of a first endless wire belt (1) and an endless press surface (7) comprising a dense, smooth surface, moving in the machine direction, the suspension cake to be dewatered being compressed between wire belt and press surface (7), and compression resulting from the wire belt wrapping the cylindrical press surface (7) in being subjected to longitudinal tension during dewatering, characterized in that at least one water-permeable or water-receiving, second, endless belt (2, 3) acts on said first wire belt (1), and a water-impermeable third endless belt (4) is pressed against said other belts (1, 2, 3) with the aid of at least one sliding surface (5) formed on a press shoe (6) to conform with said counter-acting press surface (7).
- The apparatus as set forth in claim 1, characterized in that the sum of the longitudinal tensions of all additional belts (2, 3) corresponds to at least the longitudinal tension of said first wire belt (1).
- The apparatus as set forth in claim 2, characterized in that at least one additional belt (2) is made of a wire.
- The apparatus as set forth in claim 1, characterized in that at least one additional belt (2) is made of of machine direction (MD) threads and cross machine direction (CD) threads joined unwovenly stacked with adhesion or without firm adhesion.
- The apparatus as set forth in claim 3 or 4, characterized in that at least one of said additional endless belts (2) is made of MD and CD threads, said CD threads having a higher flexural rigidity than said MD threads so that said belt in its structure is less flexible in the cross machine direction.
- The apparatus as set forth in claim 1, characterized in that at least one of said additional endless belts (2) is foraminous permitting white water passage.
- The apparatus as set forth in claim 1, characterized in that displacement is provided in the form of blind holes or grooves in the outer surface of said impermeable belt (3).
- The apparatus as set forth in any of the claims 5 to 7, characterized in that at least one of said additional belts (2, 3) is sufficiently rigid, at least in the cross machine direction, to bridge surface irregularities of said suspension cake (13).
- The apparatus as set forth in claim 1, characterized in that the dewatering pressure on said suspension cake (13) is at least ten times the dewatering pressure (compression) attained by said wire belt (1) itself over a sufficiently long period of time, the water drain (14) being assured by said first wire belt (1).
- The apparatus as set forth in claim 1, characterized in that the direction of the contact pressure exerted on said press shoe (6) is oriented symmetrically or non-symmetrically in accordance with the expansion of said press shoe (6) in the machine direction so that said contact pressure in the machine direction is either substantially consistent or increasing.
- The apparatus as set forth in claim 1, characterized in that said water-impermeable endless belt (4) is shaped only in said press zone by at least one press shoe (6) to conform with the contour of said counteracting press surface (7), is guided by circulating side shields in the remainder of its orbit substantially circular cylindrically, sealing its edges, said press shoe (6) being supported by a carrier clasping said circulating belt whilst being sealed from said side shields and non-rotatively mounted in the frame structure.
- The apparatus as set forth in claim 1, characterized in that exclusively said at least one additional, endless belt (2) receives and removes the water (14) flowing off said first wire belt (1).
- The apparatus as set forth in claim 1, characterized in that both said at least one endless belt (2) and said water-impermeable, endless belt (3, 4) receives and drains the water (14) flowing off from said first wire belt (1) by means of the plurality of blind holes or circumferential grooves provided in its outer surface.
- The apparatus as set forth in claim 1, characterized in that at least one additional, endless belt (2) is pressed under longitudinal tension from without on said first wire belt (1) after a pre-dewatering phase and that after an effective duration of at least said second belt (2, 3) a water-impermeable endless belt (4) is pressed on said already pressing belts (1, 2, 3) also with the effect of a sliding surface (5), resulting in compression on said suspension cake (13) being increased incrementally.
- The apparatus as set forth in claim 1, characterized in that after leaving the zone of maximum compression said first wire belt (1) is still not retracted from said suspension cake (13), its longitudinal tension thus still exerting dewatering pressure, and that air (17) or water can be applied at a velocity substantially different to the speed of said belt, resulting in water (14) being jetted from said wire mesh.
- The apparatus as set forth in claim 1, characterized in that said press surface (7) is formed by a round tubular roll supported on its inside to withstand, among other things, the dewatering forces by either stiffeners or by supporting members on a stationary mount.
- The apparatus as set forth in claim 1, characterized in that said smooth, endless press surface (7) moving in the machine direction is formed by a water-impermeable endless belt (4) running within the belt loop (4) over at least one suitable sliding surface (5) supporting said belt against the dewatering pressure at least in the region of said thickening process.
- The apparatus as set forth in claim 17, characterized in that said sliding surface (5) features in the machine direction a contour differing from said circular cylindrical shape consistent in width comprising more particularly a convex curve (R1 - R3) tapered in the machine direction of said belt during compression.
- The apparatus as set forth in claim 17, characterized in that said dense, smooth press surface (7) is formed by a water-impermeable endless belt (4) which is pressed with the aid of at least one suitable concave sliding surface (5) (press shoe (6)) against a round tubular roll (8) provided with a plurality of radially perforations so that said suspension cake (13) is squeezed between said water-impermeable belt (4) and said wire belt (1) whilst said wire belt (1) is supported by said foraminous tubular roll (8) which permits draining said white water (14) radially.
- The apparatus as set forth in claim 17, characterized in that said dense, smooth press surface (7) is formed by a water-impermeable endless belt (4) which is pressed with the aid of at least one suitable concave sliding surface (5) (press shoe (6)) against a circular cylindrical roll (9, 10) provided with a plurality of blind holes or circumferential grooves so that said suspension cake (13) is squeezed between said water-impermeable belt (4) and said wire belt (1) whilst said wire belt (1) is supported by said roll (9, 10) which receives said white water (14) in said blind holes or grooves.
- The apparatus as set forth in any of the preceding claims, characterized in that the compressive pressure on said suspension cake (13) amounts to at least 10 bar, more particularly at least 20 or 30 or 40 or 50 bar over a length of approximately 100 mm in the machine direction.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19805593 | 1998-02-12 | ||
DE19805593A DE19805593A1 (en) | 1998-02-12 | 1998-02-12 | Thickener |
PCT/DE1999/000359 WO1999040994A1 (en) | 1998-02-12 | 1999-02-10 | Thickener |
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Publication Number | Publication Date |
---|---|
EP1100605A1 EP1100605A1 (en) | 2001-05-23 |
EP1100605B1 true EP1100605B1 (en) | 2005-04-20 |
Family
ID=7857406
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EP99914409A Expired - Lifetime EP1100605B1 (en) | 1998-02-12 | 1999-02-10 | Thickener |
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US (1) | US6514381B1 (en) |
EP (1) | EP1100605B1 (en) |
AT (1) | ATE293487T1 (en) |
CA (1) | CA2320997A1 (en) |
DE (2) | DE19805593A1 (en) |
ES (1) | ES2242390T3 (en) |
WO (1) | WO1999040994A1 (en) |
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EP0289477A3 (en) * | 1987-04-28 | 1989-03-08 | Valmet Paper Machinery Inc. | Method for hot-pressing of a paper web and a drying device for the implementation of the method |
DE9203395U1 (en) * | 1992-03-13 | 1992-05-07 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
DE4216968A1 (en) * | 1992-05-22 | 1994-01-20 | Schenk Filterbau Gmbh | Dewatering of products, esp. sludges, fruit pulp etc. - by passing product on belt pressing drum with pressing element having flexible surface and moving with drum through ninety degrees and returning to initial position |
DE19633958A1 (en) * | 1996-04-03 | 1997-10-09 | Voith Sulzer Papiermasch Gmbh | Web press unit suction roller |
DE19650396A1 (en) * | 1996-12-05 | 1998-06-10 | Voith Sulzer Papiermasch Gmbh | Dewatering press |
DE19654200A1 (en) * | 1996-12-23 | 1998-06-25 | Voith Sulzer Papiermasch Gmbh | Wet press |
-
1998
- 1998-02-12 DE DE19805593A patent/DE19805593A1/en not_active Withdrawn
-
1999
- 1999-02-10 DE DE59911950T patent/DE59911950D1/en not_active Expired - Fee Related
- 1999-02-10 US US09/600,170 patent/US6514381B1/en not_active Expired - Fee Related
- 1999-02-10 CA CA002320997A patent/CA2320997A1/en not_active Abandoned
- 1999-02-10 AT AT99914409T patent/ATE293487T1/en not_active IP Right Cessation
- 1999-02-10 WO PCT/DE1999/000359 patent/WO1999040994A1/en active IP Right Grant
- 1999-02-10 ES ES99914409T patent/ES2242390T3/en not_active Expired - Lifetime
- 1999-02-10 EP EP99914409A patent/EP1100605B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ATE293487T1 (en) | 2005-05-15 |
DE19805593A1 (en) | 1999-08-19 |
EP1100605A1 (en) | 2001-05-23 |
DE59911950D1 (en) | 2005-05-25 |
US6514381B1 (en) | 2003-02-04 |
ES2242390T3 (en) | 2005-11-01 |
CA2320997A1 (en) | 1999-08-19 |
WO1999040994A1 (en) | 1999-08-19 |
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