EP2780505B1 - Screen - Google Patents
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- EP2780505B1 EP2780505B1 EP12779044.2A EP12779044A EP2780505B1 EP 2780505 B1 EP2780505 B1 EP 2780505B1 EP 12779044 A EP12779044 A EP 12779044A EP 2780505 B1 EP2780505 B1 EP 2780505B1
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- EP
- European Patent Office
- Prior art keywords
- screen
- slot
- openings
- section
- front side
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-
- 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
-
- 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
- D21D5/16—Cylinders and plates for screens
Definitions
- the invention relates to a sieve according to the preamble of claim 1.
- the invention also relates to a method for producing the screen.
- Such screens are used for example for wet screening of pulp suspensions to remove impurities present therein. As a rule, they are rigid and differ from flexible endless screens used in screen presses and paper machines.
- the EP 0 613 509 B1 discloses a sieve according to the preamble of claim 1.
- the object of the invention is to improve the sorting effect and / or throughput while ensuring the required screen stability.
- the one-piece design because of the lack of dividing lines within the respective section of the screen surface ensures the required strength of the section or of the screen at all. This high strength in turn allows the increase of the open screen area and thus the throughput.
- slots are formed with and between parallel screen bars.
- this is relatively expensive to manufacture and, on the other hand, limits the achievable open screen area while ensuring high strength.
- the profiled screen front creates turbulence in the suspension, significantly improving sorting efficiency and throughput, which has a positive impact on energy requirements.
- the throughput can also be increased by the fact that at least a portion of the slot-shaped screen openings at least a section opens into a survey of the profile of the Siebvorderseite and / or at least in part of the slot-shaped screen openings, the height of the mouth on the Siebvorderseite in the longitudinal direction of the slot changed.
- the open screen area of the section is between 15 and 25%.
- the positive effects of the invention can then be used extensively if the entire sieve, in particular the entire perforated sieve surface is integrally formed.
- the profile depth of the screen front side is between 0.5 and 3 mm, preferably between 0.7 and 1.2 mm.
- the thickness of the screen between 2 and 8 mm, preferably between 4 and 6 mm and / or the web width between adjacent slot-shaped screen openings should be greater than 0.3 mm, and preferably between 1 and 5 mm.
- the cross section of the slot-shaped screen openings lying perpendicular to the flow direction has at least one round section or only straight sections.
- the sieve can be flat or designed as a cylinder, wherein the slot-shaped sieve openings preferably extend approximately parallel to the cylinder axis.
- the use of the invention is particularly suitable for treating a pulp suspension suitable for producing a paper, board, tissue or other fibrous web.
- at least the one-piece section of the screen preferably the entire screen should be made of metal.
- the slot-shaped screen openings should have a width between 0.1 and 1.0 mm, preferably between 0.1 and 0.45 mm. Cost advantages in the manufacture of the screen arise when the slot-shaped screen openings of at least one section and preferably also the profile of the front side of the screens are produced by means of water jet cutting. For this purpose, the thickness of the screen should be less than 20 mm.
- the result of the production of the slot-shaped screen openings is also an irregular profiling of the area of the opening, which can already be sufficient in many cases.
- FIG. 1 can be seen a pressure sorter according to the invention with a one-piece, metallic screen 2, here in the form of a cylindrical screen basket with a vertical cylinder axis 10, which divides the interior of the pressure sorter in an inlet space 8 and an accepts space 9.
- a pressure sorter according to the invention with a one-piece, metallic screen 2, here in the form of a cylindrical screen basket with a vertical cylinder axis 10, which divides the interior of the pressure sorter in an inlet space 8 and an accepts space 9.
- the pulp suspension 1 is fed via a suspension feed 11.
- the pulp suspension 1 receives an angular momentum which causes it to move circumferentially.
- a transport flow is generated as a result of the applied pressure gradient between the above drawn suspension inlet 11 and the underlying Rejektauslauf 12 of the inlet chamber 8.
- the rejected from the screen 2 part of the pulp suspension 1 is conveyed as a reject 18 via the Rejektauslauf 12 from the feed chamber 8.
- this sieve scraper is formed by a rotor 6 rotating in the screen 2 with rotor blades 15 attached thereto.
- the rotor 6 has the shape of a cylindrical drum, wherein the axis of rotation 7 coincides with the cylinder axis 10.
- All rotor blades 15 in this case have the same shape, which leads to a uniform effect on the pulp suspension 1 and the wire 2.
- the rotor blades 15 are arranged distributed over a plurality of perpendicular to the axis of rotation 7 extending circumferential planes of the rotor 6.
- the rotor blades 15 are formed by way of example as elevations on the rotor 6.
- the sieve surface comprises a multiplicity of sieve openings 3 arranged as uniformly as possible with the same minimum cross-sectional area in the direction of flow 5 to ensure the same sorting effect.
- the open screen area of the screen 2 is between 15 and 25%.
- the sum of the smallest flow cross-sections through the sieve 2 relative to the respective perforated sieve surface is considered as open sieve surface.
- FIG. 2 represented a pulper, in whose container 16 a suspension 1 of pulp and water is formed.
- the suspension is 1 from a front of a sieve 2 at the bottom of the container 16 rotating rotor 6 mixed.
- the rotor 6 generates in front of the screen 2 a rotational flow, which improves the sorting effect and the passage.
- the screen 2 which is an example here, is flowed through by the pulp suspension 1 from the front of the sieve 4. Larger impurities are retained and can be cleared away from the rotor 6 on the Siebvorderseite 4.
- the suspension 1 After flowing through the sieve 2, the suspension 1 can be collected and removed under the sieve 2.
- the longest extent of the slots in the screen 2 is approximately perpendicular to the rotational flow generated by the rotor 6 14 of the suspension 1 in front of the screen. 2
- the slot-shaped screen openings 3 have a width of 0.1 to 0.45 mm and a length of between 10 and 100 mm.
- the Siebvorderseite 4 of the screen 2 according to the FIGS. 3 and 4 an irregular micro-profile whose depth is between 0.5 and 1.2 mm. This profile has the consequence that the height of the mouth on the Siebvorderseite 4 changed in the longitudinal direction of the slot and ensures microturbulence in the suspension.
- the sieve 2 in addition to this micro-profile, the sieve 2, as in FIG. 4 shown, still makroProfile in the form of grooves o.ä. having a tread depth between 1.2 and 3 mm or more.
- the screen openings 3 on the Siebvorderseite 4th partially or wholly in the sinks or even in the surveys of the macro-profile.
- This variety of mouth design also extends the sorting characteristics of the screen openings 3 and also has more turbulence in the suspension 1 result.
- the screen openings 3 are arranged in parallel rows, wherein the web width between the, on the long sides adjacent slot-shaped screen openings 3 is approximately between 1 and 5 mm.
- FIGS. 5a-d show ways of slot design of the screen openings 3.
- the slots are formed only by a single straight section.
- the slots have at FIG. 5b two straight sections, the sections forming an obtuse angle. at FIG. 5d These obtuse-angled slots are arranged offset to one another.
- the slots in FIG. 5c are formed exclusively by round sections.
- the material to be processed is separated by a high-pressure water jet, wherein a cutting agent, a so-called abrasive, is added to the water to increase the cutting power.
- a cutting agent a so-called abrasive
- the water jet cutting allows the introduction of narrow slits even in such a thick, metallic screens 2. As a result, a large open screen surface generated and also counted because of the one-piece with a high strength of the screen 2 become.
- a conical or trumpet-shaped widening of the screen openings 3 in the flow direction 5, as in FIG. 4 shown, can be easily generated with the water jet cutting from the back of the screen.
- the angle 19 between a straight line through the sieve front-side beginning and the siebrück workede end of the wall of the sieve opening 3 and the flow direction 5 is between 3 and 5 °.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Description
Die Erfindung betrifft ein Sieb gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a sieve according to the preamble of
Die Erfindung betrifft ebenso ein Verfahren zur Herstellung des Siebes.The invention also relates to a method for producing the screen.
Derartige Siebe werden beispielsweise zur Nasssiebung von Faserstoffsuspensionen verwendet, um darin vorhandene Störstoffe zu entfernen. Sie sind in der Regel starr und unterscheiden sich dadurch von flexiblen Endlossieben, die in Siebpressen und Papiermaschinen verwendet werden.Such screens are used for example for wet screening of pulp suspensions to remove impurities present therein. As a rule, they are rigid and differ from flexible endless screens used in screen presses and paper machines.
Die Charakteristik eines solchen Siebes ergibt sich im Wesentlichen aus Größe, Form und Anzahl der sich darin befindenden Sieböffnungen. Diese werden in der Regel kleiner gehalten als die auszusiebenden Stoffe.The characteristic of such a sieve results essentially from the size, shape and number of sieve openings therein. These are usually kept smaller than the auszusiebenden substances.
Verwendet werden solche Siebe mit Vorteil z. B. in Stofflösern, Sekundärstofflösern und Sortierern zur Aufbereitung von Papierfasersuspensionen, wobei sie die Aufgabe haben, Störstoffe zurückzuhalten.Are used such sieves with advantage z. As in pulpers, Sekundärstofflösern and sorters for the treatment of paper fiber suspensions, where they have the task of retaining impurities.
Natürlich ist man bestrebt, bei derartigen Sieben einen möglichst großen Durchsatz zu ermöglichen, d. h. eine möglichst große Menge von nicht abgewiesenen Stoffen soll die Öffnungen passieren. Das lässt sich dadurch fördern, dass möglichst viele Öffnungen vorhanden sind. Gesamthaft ausgedrückt, bemüht man sich um eine möglichst große offene Siebfläche, bezogen auf die gesamte Oberfläche des Siebelementes.Of course, one endeavors to enable the highest possible throughput in such screens, d. H. The largest possible amount of non-rejected substances should pass through the openings. This can be promoted by having as many openings as possible. In total terms, efforts are made to open the largest possible screen area, based on the entire surface of the screen element.
Eine weitere Forderung ist eine relativ hohe Festigkeit gegen hydraulischen Druck. Solche Siebe werden in einem Produktionsbetrieb eingesetzt, bei dem es auch einmal zu Störungen kommt, was zu unterschiedlicher und beträchtlicher Druckbelastung der Siebe führt. Da sich eine Verstopfung nicht immer ausschließen lässt, können durchaus hohe Drücke und bei den entsprechend großen Flächen auch hohe Kräfte auf die Oberfläche solcher Siebe wirken. Diese erhöhten Kräfte müssen durch das Sieb aufgenommen werden können, ohne dass eine BeschädigungAnother requirement is a relatively high resistance to hydraulic pressure. Such strainers are used in a production plant in which it too Once disturbances occur, which leads to different and considerable pressure load of the screens. Since a blockage can not always be ruled out, it is possible for high pressures to act on the surface of such screens and, for the correspondingly large areas, also high forces. These increased forces must be absorbed by the sieve without damaging it
Die
Die Aufgabe der Erfindung ist es die Sortierwirkung und/oder den Durchsatz bei Gewährleistung der erforderlichen Siebstabilität zu verbessern.The object of the invention is to improve the sorting effect and / or throughput while ensuring the required screen stability.
Erfindungsgemäß wurde die Aufgabe durch ein Sieb gemäß dem Anspruch 1 gelöst.According to the invention the object has been achieved by a sieve according to
Dabei sorgt die einstückige Ausbildung wegen fehlender Trennlinien innerhalb des jeweiligen Abschnitts der Siebfläche für die erforderliche Festigkeit des Abschnitts bzw. des Siebes überhaupt. Diese hohe Festigkeit wiederum erlaubt die Steigerung der offenen Siebfläche und damit des Durchsatzes.The one-piece design because of the lack of dividing lines within the respective section of the screen surface ensures the required strength of the section or of the screen at all. This high strength in turn allows the increase of the open screen area and thus the throughput.
Üblicherweise werden derartige Schlitze mit und zwischen parallelen Siebstäben gebildet. Dies ist einerseits relativ aufwendig in der Herstellung und begrenzt andererseits bei Gewährleistung einer hohen Festigkeit die erreichbare offene Siebfläche.Typically, such slots are formed with and between parallel screen bars. On the one hand, this is relatively expensive to manufacture and, on the other hand, limits the achievable open screen area while ensuring high strength.
Die profilierte Siebvorderseite schafft Turbulenzen in der Suspension und verbessert so die Sortierwirkung und den Durchsatz erheblich, was sich positiv auf den Energiebedarf auswirkt.The profiled screen front creates turbulence in the suspension, significantly improving sorting efficiency and throughput, which has a positive impact on energy requirements.
Als Siebvorderseite wird hierbei die Seite des Siebes angesehen, von der aus die Suspension durch das Sieb strömt.As Siebvorderseite here the side of the sieve is considered, from which the suspension flows through the sieve.
Der Durchsatz lässt sich dabei auch dadurch steigern, dass zumindest bei einem Teil der schlitzförmigen Sieböffnungen wenigstens ein Abschnitt in eine Erhebung des Profils der Siebvorderseite mündet und/oder sich zumindest bei einem Teil der schlitzförmigen Sieböffnungen die Höhe der Mündung auf der Siebvorderseite in Längsrichtung des Schlitzes verändert.The throughput can also be increased by the fact that at least a portion of the slot-shaped screen openings at least a section opens into a survey of the profile of the Siebvorderseite and / or at least in part of the slot-shaped screen openings, the height of the mouth on the Siebvorderseite in the longitudinal direction of the slot changed.
Hierdurch werden nicht nur weitere Turbulenzen in der Suspension erzeugt sondern auch die Aufnahmefähigkeit der Mündungen verbessert.This not only creates further turbulence in the suspension but also improves the absorption capacity of the mouths.
Für die meisten Anwendungen hat es sich dabei als vorteilhaft erwiesen, wenn die offene Siebfläche des Abschnittes zwischen 15 und 25% liegt.For most applications, it has proven to be advantageous if the open screen area of the section is between 15 and 25%.
Des Weiteren können die positiven Effekte der Erfindung dann umfassend genutzt werden, wenn das gesamte Sieb, insbesondere die gesamte perforierte Siebfläche einstückig ausgebildet ist.Furthermore, the positive effects of the invention can then be used extensively if the entire sieve, in particular the entire perforated sieve surface is integrally formed.
Hinsichtlich einer ausreichenden Turbulenzbildung an der Siebvorderseite ist es von Vorteil, wenn die Profiltiefe der Siebvorderseite zwischen 0,5 und 3 mm, vorzugsweise zwischen 0,7 und 1,2 mm liegt.With regard to sufficient turbulence formation on the front side of the screen, it is advantageous if the profile depth of the screen front side is between 0.5 and 3 mm, preferably between 0.7 and 1.2 mm.
Für das Erreichen einer hohen Dichte an Sieböffnungen ist es vorteilhaft, wenn zumindest ein wesentlicher Teil der, vorzugsweise alle schlitzförmigen Sieböffnungen parallel zueinander angeordnet sind.To achieve a high density of screen openings, it is advantageous if at least a substantial part of, preferably all slot-shaped screen openings are arranged parallel to each other.
Um trotz der großen offenen Siebfläche eine hohe Festigkeit des Siebes zu erreichen, sollte die Dicke des Siebes zwischen 2 und 8 mm, vorzugsweise zwischen 4 und 6 mm und/oder die Stegbreite zwischen benachbarten, schlitzförmigen Sieböffnungen größer als 0,3 mm sein und vorzugsweise zwischen 1 und 5 mm liegen.In order to achieve a high strength of the screen despite the large open screen area, the thickness of the screen between 2 and 8 mm, preferably between 4 and 6 mm and / or the web width between adjacent slot-shaped screen openings should be greater than 0.3 mm, and preferably between 1 and 5 mm.
Je nach Art der Behandlung und/oder der Beschaffenheit der Suspension und/oder der Störstoffe kann es von Vorteil sein, wenn der senkrecht zur Durchströmrichtung liegende Querschnitt der schlitzförmigen Sieböffnungen wenigstens einen runden Abschnitt oder aber nur gerade Abschnitte aufweist.Depending on the type of treatment and / or the nature of the suspension and / or the contaminants, it may be advantageous if the cross section of the slot-shaped screen openings lying perpendicular to the flow direction has at least one round section or only straight sections.
Je nach Anwendungsfall kann das Sieb eben oder aber als Zylinder ausgebildet sein, wobei die schlitzförmigen Sieböffnungen vorzugsweise etwa parallel zur Zylinderachse verlaufen.Depending on the application, the sieve can be flat or designed as a cylinder, wherein the slot-shaped sieve openings preferably extend approximately parallel to the cylinder axis.
Wegen der besonderen Anforderungen insbesondere hinsichtlich Stabilität und Verschleiß eignet sich die Anwendung der Erfindung insbesondere zur Behandlung einer, zur Herstellung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn geeigneten Faserstoffsuspension. Dabei sollte zumindest der einstückige Abschnitt des Siebes, vorzugsweise das gesamte Sieb aus Metall bestehen. Des Weiteren sollten die schlitzförmigen Sieböffnungen eine Breite zwischen 0,1 und 1,0 mm, vorzugsweise zwischen 0,1 und 0,45 mm haben. Kostenvorteile bei der Herstellung des Siebes ergeben sich, wenn die schlitzförmigen Sieböffnungen zumindest eines Abschnittes und vorzugsweise auch das Profil der Vorderseite des Siebe mittels Wasserstrahlschneiden hergestellt werden. Hierzu sollte die Dicke des Siebes kleiner als 20 mm sein.Because of the special requirements, in particular with regard to stability and wear, the use of the invention is particularly suitable for treating a pulp suspension suitable for producing a paper, board, tissue or other fibrous web. In this case, at least the one-piece section of the screen, preferably the entire screen should be made of metal. Furthermore, the slot-shaped screen openings should have a width between 0.1 and 1.0 mm, preferably between 0.1 and 0.45 mm. Cost advantages in the manufacture of the screen arise when the slot-shaped screen openings of at least one section and preferably also the profile of the front side of the screens are produced by means of water jet cutting. For this purpose, the thickness of the screen should be less than 20 mm.
Wenn bei der Herstellung der Sieböffnungen die Siebvorderseite einer Wasserstrahlbehandlung ausgesetzt wird, so ergibt sich bei der Herstellung der schlitzförmigen Sieböffnungen auch eine unregelmäßige Profilierung des Mündungsbereichs, was für viele Fälle bereits genügen kann.If, during the production of the screen openings, the front side of the screen is exposed to a water jet treatment, the result of the production of the slot-shaped screen openings is also an irregular profiling of the area of the opening, which can already be sufficient in many cases.
Bei vielen Anwendungen ist es ebenso von Vorteil, dass sich die Sieböffnungen in Durchströmrichtung der zu siebenden Suspension erweitern, vorzugsweise konisch oder trompetenartig erweitern, was beim Wasserstrahlschneiden von der Siebrückseite her leicht realisiert werden kann. Dabei sollte der Winkel zwischen einer Geraden durch den siebvorderseitigen Anfang und das siebrückseitige Ende der Wandung der Sieböffnung und der Durchströmrichtung zwischen 1 und 8°, vorzugsweise zwischen 3 und 5° liegen. Die Aufweitung der Sieböffnung wirkt einer Verstopfung entgegen, ist aber so klein, dass die Festigkeit des Siebes nicht wesentlich beeinträchtigt wird.In many applications, it is also advantageous that expand the sieve openings in the direction of flow of the suspension to be sieved, preferably conically or expand trumpet-like, which can be easily realized in the water jet cutting from the Siebrückseite ago. In this case, the angle between a straight line through the sieve front-side beginning and the siebrückseitige end of the wall of the sieve opening and the flow direction between 1 and 8 °, preferably between 3 and 5 °. The expansion of the sieve opening counteracts blockage, but is so small that the strength of the sieve is not significantly affected.
Nachfolgend soll die Erfindung an mehreren Ausführungsbeispielen näher erläutert werden.The invention will be explained in more detail below with reference to several exemplary embodiments.
In der beigefügten Zeichnung zeigt:
-
Figur 1 : einen schematischen Querschnitt durch einen Drucksortierer; -
Figur 2 : einen schematischen Querschnitt durch einen Stofflöser; -
: einen Teilquerschnitt durchFigur 3 und 4unterschiedliche Siebe 2 und -
α-d: Sieböffnungen mit unterschiedlichem Querschnitt.Figur 5
-
FIG. 1 a schematic cross section through a pressure sorter; -
FIG. 2 a schematic cross-section through a pulper; -
FIGS. 3 and 4 a partial cross section throughdifferent sieves 2 and -
FIG. 5 α-d: sieve openings with different cross section.
In
In den Zulaufraum 8 wird über einen Suspensionszulauf 11 die Faserstoffsuspension 1 zugeführt.In the
Bei dem hier verwendeten Drucksortierer erhält die Faserstoffsuspension 1 einen Drehimpuls, der sie in eine Umfangsbewegung versetzt. Zusätzlich hierzu wird in Folge des anliegenden Druckgefälles zwischen dem oben gezeichneten Suspensionszulauf 11 und dem unten liegenden Rejektauslauf 12 des Zulaufraumes 8 eine Transportströmung erzeugt.In the pressure sorter used here, the
Auf dem Weg dieser Transportströmung wird ein großer Teil der Faserstoffsuspension 1 bestimmungsgemäß durch das Sieb 2 als Gutstoff 17 in den Gutstoffraum 9 abgeleitet und von dort über den Gutstoffablauf 13 abgeführt. Dabei tritt auch zumindest ein großer Teil der in der Faserstoffsuspension 1 enthaltenen Fasern in den Gutstoffraum 9 über.On the way of this transport flow, a large part of the
Der vom Sieb 2 abgewiesene Teil der Faserstoffsuspension 1 wird als Rejekt 18 über den Rejektauslauf 12 aus dem Zulaufraum 8 gefördert.The rejected from the
Um zu verhindern, dass die Öffnungen des Siebes 2 verstopft werden, wird ein an sich bekannter Siebräumer eingesetzt, der sich relativ zum Sieb 2 bewegt.In order to prevent the openings of the
Beispielhaft wird dieser Siebräumer von einem im Sieb 2 rotierenden Rotor 6 mit daran befestigten Rotorflügeln 15 gebildet. Dabei hat der Rotor 6 die Form einer zylindrischen Trommel, wobei die Rotationsachse 7 mit der Zylinderachse 10 übereinstimmt.By way of example, this sieve scraper is formed by a
Alle Rotorflügel 15 haben hierbei die gleiche Form, was zu einer gleichmäßigen Wirkung auf die Faserstoffsuspension 1 und das Sieb 2 führt.All
Außerdem sind die Rotorflügel 15 über mehrere senkrecht zur Rotationsachse 7 verlaufende Umfangsebenen des Rotors 6 verteilt angeordnet.In addition, the
In
Die Siebfläche umfasst dabei eine Vielzahl von möglichst gleichmäßig verteilt angeordneten Sieböffnungen 3 mit der gleichen minimalen Querschnittsfläche in Durchströmrichtung 5 zur Gewährleistung gleicher Sortierwirkung. Für einen hohen Durchsatz liegt die offene Siebfläche des Siebes 2 zwischen 15 und 25%. Als offene Siebfläche wird hierbei die Summe der kleinsten Strömungsquerschnitte durch das Sieb 2 bezogen auf die jeweilige, perforierte Siebfläche betrachtet.In this case, the sieve surface comprises a multiplicity of
Demgegenüber ist in
Das hier beispielhaft ebene Sieb 2 wird von der Siebvorderseite 4 her von der Faserstoffsuspension 1 durchströmt. Größere Störstoffe werden dabei zurückgehalten und können auf der Siebvorderseite 4 vom Rotor 6 weggeräumt werden.The
Nach Durchströmen des Siebes 2 kann die Suspension 1 unter dem Sieb 2 aufgefangen und abgeführt werden.After flowing through the
Wie in
Während die Dicke des Siebes 2 zwischen 4 und 6 mm liegt, haben die schlitzförmigen Sieböffnungen 3 eine Breite von 0,1 bis 0,45 mm und eine Länge zwischen 10 und 100 mm.While the thickness of the
Um den Durchsatz zu erhöhen, weist die Siebvorderseite 4 des Siebes 2 entsprechend den
Neben diesem Mikro-Profil kann das Sieb 2, wie in
Wie in den
Dabei sind die Sieböffnungen 3 in parallelen Reihen angeordnet, wobei die Stegbreite zwischen den, an den langen Seiten benachbarten schlitzförmigen Sieböffnungen 3 etwa zwischen 1 und 5 mm liegt.In this case, the
Die
Im Gegensatz hierzu besitzen die Schlitze bei
Die Schlitze in
Die Herstellung der Sieböffnungen 3 des Siebes 2 erfolgt mittels Wasserstrahlschneiden.The production of the
Beim Wasserstrahlschneiden wird das zu bearbeitende Material durch einen Hochdruckwasserstrahl getrennt, wobei zur Erhöhung der Schneidleistung dem Wasser ein Schneidmittel, ein sogenanntes Abrasiv, zugesetzt wird.In water-jet cutting, the material to be processed is separated by a high-pressure water jet, wherein a cutting agent, a so-called abrasive, is added to the water to increase the cutting power.
Das Wasserstrahlschneiden erlaubt das Einbringen schmaler Schlitze selbst in derart dicke, metallische Siebe 2. Im Ergebnis kann eine große offene Siebfläche erzeugt und wegen der Einstückigkeit auch mit einer hohen Festigkeit des Siebes 2 gerechnet werden.The water jet cutting allows the introduction of narrow slits even in such a thick,
Des Weiteren können bei einer Wasserstrahl-Behandlung der Siebvorderseite 4 Mikro- aber auch Makroprofile auf dieser erzeugt werden, was den Herstellungsprozess weiter vereinfacht.Furthermore, in the case of a water-jet treatment of the screen front side, it is possible to produce 4 micro- as well as macro-profiles on it, which further simplifies the production process.
Auch eine konische oder trompetenförmige Aufweitung der Sieböffnungen 3 in Durchströmrichtung 5, wie in
Claims (15)
- Screen (2) having a profiled screen front side (4) for treating a suspension (1), with a multiplicity of slot-like screen openings (3), at least one section of the screen (2) which comprises a plurality of slot-like screen openings (3) being formed in one piece,
characterized in that
the screen (2) has an open screen area between 12 and 33%, wherein, at least in some of the slot-like screen openings (3), at least one section opens into an elevation of the profile of the screen front side (4) and/or, at least in some of the slot-like screen openings (3), the height of the opening on the screen front side (4) is changed in the longitudinal direction of the slot. - Screen (2) according to Claim 1,
characterized in that
the open screen area of the section is between 15 and 25%. - Screen (2) according to Claim 1 or 2,
characterized in that
the whole of the perforated screen area is formed in one piece. - Screen (2) according to one of the preceding claims,
characterized in that
the thickness of the screen (2) is less than 20 mm and preferably lies between 2 and 8 mm. - Screen (2) according to one of the preceding claims,
characterized in that
the profile depth of the screen front side (4) is less than 3 mm and preferably lies between 0.7 and 1.2 mm. - Screen (2) according to one of the preceding claims,
characterized in that
at least a substantial proportion, preferably all, of the slot-like screen openings (3) are arranged parallel to one another. - Screen (2) according to Claim 6,
characterized in that
the web width between adjacent slot-like screen openings (3) is greater than 0.3 mm and preferably lies between 1 and 5 mm. - Screen (2) according to one of the preceding claims,
characterized in that
the slot-like screen openings (3) have a width between 0.1 and 1.0, preferably between 0.1 and 0.45 mm. - Screen (2) according to one of the preceding claims,
characterized in that
the cross section of the slot-like screen openings (3) at right angles to the flow direction (5) has at least one round section. - Screen (2) according to one of Claims 1 to 9,
characterized in that
the cross section of the slot-like screen openings (3) at right angles to the flow direction (5) has only straight sections. - Screen (2) according to one of the preceding claims,
characterized in that
the screen openings (3) widen in the flow direction (5), in particular widen conically or in the manner of a trumpet, wherein the angle (19) between a straight line through the start on the screen front side and the end of the wall of the screen opening (3) on the screen rear side and the flow direction (5) lies between 1 and 8°, preferably between 3 and 5°. - Screen (2) according to one of the preceding claims,
characterized in that
the screen (2) is flat. - Screen (2) according to one of Claims 1 to 11,
characterized in that
the screen (2) is formed as a cylinder and the slot-like screen openings (3) preferably extend approximately parallel to the cylinder axis (10). - Screen (2) according to one of the preceding claims for treating a fibrous material suspension (1) suitable for producing a paper, board, tissue or another fibrous material web,
characterized in that
at least the one-piece section of the screen (2) consists of metal. - Method for producing a screen (2) with slot-like screen openings (3) and a profiled screen front side (4) according to one of the preceding claims, wherein the slot-like screen openings (3) of at least one section and preferably also the profile of the screen front side (4) are produced by means of water-jet cutting.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011086428A DE102011086428A1 (en) | 2011-11-16 | 2011-11-16 | scree |
DE202011108856U DE202011108856U1 (en) | 2011-11-16 | 2011-12-06 | scree |
PCT/EP2012/071140 WO2013072174A1 (en) | 2011-11-16 | 2012-10-25 | Screen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2780505A1 EP2780505A1 (en) | 2014-09-24 |
EP2780505B1 true EP2780505B1 (en) | 2019-09-11 |
Family
ID=45805113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12779044.2A Active EP2780505B1 (en) | 2011-11-16 | 2012-10-25 | Screen |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2780505B1 (en) |
CN (1) | CN103930617B (en) |
DE (2) | DE102011086428A1 (en) |
ES (1) | ES2751461T3 (en) |
PT (1) | PT2780505T (en) |
WO (1) | WO2013072174A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014013650A1 (en) * | 2014-09-19 | 2016-03-24 | Siebtechnik Gmbh | Screen covering and method for producing a screen covering |
CN105317702A (en) * | 2015-10-28 | 2016-02-10 | 泉州市永茂电子科技有限公司 | Remote-control water pump |
DE202016008505U1 (en) * | 2016-02-19 | 2018-03-13 | Voith Patent Gmbh | pulper |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2086271U (en) * | 1991-03-12 | 1991-10-09 | 邱俊雄 | Cylindrical sieve plate for screening machine |
FI89521C (en) * | 1991-10-04 | 1993-10-11 | Cae Investments Bv | Process for producing a screen product and by the process for produced screen product |
US5607589A (en) * | 1995-06-06 | 1997-03-04 | Cae Screenplates Inc. | Multiple contour screening |
SE507471C2 (en) * | 1996-08-09 | 1998-06-08 | Sunds Defibrator Ind Ab | Screen panel and method of making it |
EP2547824B1 (en) * | 2010-03-16 | 2018-07-18 | Tampulping OY | Pressure filter |
-
2011
- 2011-11-16 DE DE102011086428A patent/DE102011086428A1/en not_active Withdrawn
- 2011-12-06 DE DE202011108856U patent/DE202011108856U1/en not_active Expired - Lifetime
-
2012
- 2012-10-25 CN CN201280056502.5A patent/CN103930617B/en active Active
- 2012-10-25 ES ES12779044T patent/ES2751461T3/en active Active
- 2012-10-25 WO PCT/EP2012/071140 patent/WO2013072174A1/en active Application Filing
- 2012-10-25 PT PT127790442T patent/PT2780505T/en unknown
- 2012-10-25 EP EP12779044.2A patent/EP2780505B1/en active Active
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
EP2780505A1 (en) | 2014-09-24 |
CN103930617A (en) | 2014-07-16 |
WO2013072174A1 (en) | 2013-05-23 |
ES2751461T3 (en) | 2020-03-31 |
PT2780505T (en) | 2019-11-27 |
CN103930617B (en) | 2017-02-22 |
DE202011108856U1 (en) | 2012-01-20 |
DE102011086428A1 (en) | 2013-05-16 |
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