EP1357222A1 - Process for wet screening fibrous suspensions - Google Patents
Process for wet screening fibrous suspensions Download PDFInfo
- Publication number
- EP1357222A1 EP1357222A1 EP03003474A EP03003474A EP1357222A1 EP 1357222 A1 EP1357222 A1 EP 1357222A1 EP 03003474 A EP03003474 A EP 03003474A EP 03003474 A EP03003474 A EP 03003474A EP 1357222 A1 EP1357222 A1 EP 1357222A1
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- EP
- European Patent Office
- Prior art keywords
- sieve
- screen
- elongated holes
- angle
- suspension
- 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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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/023—Stationary screen-drums
- D21D5/026—Stationary screen-drums with rotating cleaning foils
-
- 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 method according to the preamble of claim 1.
- Sieves with a cylindrical shape are called sieve baskets. But there are also levels Sieves that serve the same purpose.
- sieves on the other hand are optimal for fine sorting. This is partly because that the paper fibers that are to pass through the screen in such sorting processes are one have elongated shape while a large part of the impurities are cubic or is flat. When choosing a suitable sieve, always weigh it up between the demands for high throughput and the demanded Sorting quality. Examples of a perforated screen basket are shown in DE 196 35 189 and a slotted screen basket DE 39 27 748 A1.
- a strainer basket which has relatively narrow slots provided and is essentially intended for fine sorting. These slots Unlike the usual slotted screen baskets, they do not run over the entire axial Extension of the strainer basket, but are divided several times. This is supposed to Sorting quality of the slotted screen basket can be improved. Sieve baskets of this type are especially for the removal of very poorly sorted substances, e.g. Stickies, optimized. As a rule, this is done with a relatively low throughput, based on the entire screen area, bought. Sieves of this type also require a relatively low one Consistency. It should be below 2.5%, if possible around 1.5%. It's different with Perforated screens, which are still with a consistency around and over 3% reliable and let it operate effectively.
- Sorting quality of the slotted screen basket can be improved.
- Sieve baskets of this type are especially for the removal of very poorly sorted substances, e.g. Stickies, optimized. As a rule, this is done with a relatively low throughput, based on the entire
- the screen baskets known from EP 0 455 312 A2 are apparently also available Fine sorting determined. Specific information for preferred examples is included Slot widths well below 1 mm. You can find it elsewhere in Scripture too other information, e.g. from "0.002 inches to 0.35 inches or more" that is 0.05 mm to 9 mm or more. However, that is another area and nothing is said for which use cases which selection should be made.
- the publication primarily describes methods to create slots or holes, their shape and size are convenient for certain applications. In this context, too explains that with the new manufacturing process, there is also the possibility to produce unusual shapes of screen openings, including a number of examples is enumerated.
- the invention is based on the object, the method for sorting Fiber suspensions to improve even further, so that without significant loss of Sorting quality the throughput can be increased.
- FIG. 1 shows by way of example, this can be used to carry out the method strainer 1 used as a cylindrical strainer basket (drawn in perspective) his. It is crucial for the method that the screen openings 3 in the Claims described are formed as elongated holes. Here are only a few elongated holes drawn. As you know, there are sieve baskets that have thousands have such sieve openings. In order to wet sieve a fiber suspension S in the example shown here, this is carried out from above into the Sieve basket formed interior initiated. Part of this fiber suspension S can pass through the screen openings 3 and in this way get into the accept A. Another Part that at least partially consists of the substances rejected at the screen openings 3 exists, is led out from the screen 1 as reject R below.
- the reamer 4 is provided with wing profiles, of which only one is drawn; as is well known, other shapes are also possible.
- the scraper 4 will driven by a central shaft 6 and thereby in the indicated by arrow Direction of movement 5 moved past the inside of the sieve. So it's about a screen clearing on the inlet side of the screen, which is particularly effective and at which Carrying out the method is preferred.
- the screen openings 3 have the shape of elongated holes, as exemplarily something are shown in more detail in FIG. 2. They have a hole width W that is between 1 and 8 mm, and a hole length L between 1 and 50 mm.
- the hole length L is an advantage at least twice as large as the hole size W.
- the Distance A the adjacent sieve openings 3 in the direction of their longitudinal extent from each other. Values between 1 and 6 mm are particularly favorable here because they are small enough to allow a sufficiently large open screen area and large enough to prevent long fiber spinning on the screen webs.
- the shape and size of such sieve openings on the To coordinate the intended use it has been shown that the specified Measuring ranges deliver optimal results when carrying out the method.
- screen baskets are particularly well suited to the process, if the longitudinal extent of the elongated holes is such that their angle ⁇ to the axial direction 7 of the screen basket is very much larger than 0, preferably over 45 °. 1 and 2 show a shape with an angle ⁇ of 90 °.
- the alignment of the elongated holes can also be done with respect to Define reamer movement.
- the drawing shows an angle ⁇ , which, between the Longitudinal extension of the elongated holes and the direction of movement 5 of the reamer 4 measured, here has a value of 30 °.
- the procedure is in this form carried out, a relatively high long fiber content gets into the accepted material.
- the so achievable good selectivity of wet sieving is due to the fact that Alignment, size and shape of the screen openings optimally to the requirements of a Wet fiber screening are matched.
- flat sieves can also be used, as they are e.g. are used in suitably designed sorting apparatus.
- conceivable Applications are also secondary substance dissolver and pulper machine.
- An example for DE 2345735 shows a secondary pulper.
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method according to the preamble of
Eine wichtige Anwendung derartiger Verfahren ist das Sortieren von Faserstoffsuspensionen in Drucksortierern. Dabei sollen die in der Suspension enthaltenen Fasern als Gutstoff das Sieb passieren, während die nicht gewünschten festen Bestandteile abgewiesen und als Überlauffraktion aus dem Drucksortierer wieder abgeleitet werden. Neben der guten Sortierwirkung ist ein hoher Durchsatz durch die Siebvorrichtung wichtig, um das Sortierverfahren ökonomisch durchführen zu können. Üblicherweise wird dabei der Durchsatz auf die offene freie Siebfläche bezogen, um die diesbezügliche Eigenschaft des Siebes zu quantifizieren. Analog dazu kann man auch die Siebdurchtrittsgeschwindigkeit angeben, die sich rechnerisch aus Volumendurchsatz und Summe der Lochflächen ergibt.An important application of such methods is the sorting of Fibrous suspensions in pressure sorters. In doing so, the suspension fibers contained as a good substance pass through the sieve, while the unwanted solid components rejected and again as an overflow fraction from the pressure sorter be derived. In addition to the good sorting effect, a high throughput is due to the Screening device important in order to be able to carry out the sorting process economically. The throughput is usually related to the open free screen area by which the to quantify the relevant property of the sieve. You can also do the same Specify sieve throughput speed, which is calculated from volume throughput and Sum of the perforated areas results.
Bei Durchführung eines Verfahrens dieser Art wird in fast allen Fällen ein Räumer dicht an der Oberfläche des Siebes vorbeibewegt, um das Abgewiesene aus dem Einlaufbereich der Sieböffnungen zu entfernen. Räumer erzeugen zumeist auch Druckund/oder Saugstöße. Durch die Saugstöße kehrt sich die Strömungsrichtung in der Sieböffnung kurzzeitig um, so dass Faseransammlungen oder Partikel, die nicht hindurch gelangen können, entgegen der normalen Durchströmungsrichtung wieder zurückgefördert werden.When carrying out a procedure of this kind, a scraper is used in almost all cases moved close to the surface of the sieve to remove what was rejected Remove the inlet area of the sieve openings. Scrappers mostly also produce pressure and / or Saugstöße. The direction of flow reverses in the Sieve opening briefly so that fiber accumulations or particles that are not can get through, against the normal flow direction again be promoted back.
Siebe mit einer zylindrischen Form werden Siebkörbe genannt. Es gibt aber auch ebene Siebe, die demselben Zweck dienen.Sieves with a cylindrical shape are called sieve baskets. But there are also levels Sieves that serve the same purpose.
Auch wenn alle Siebe, die zum Sortieren von Faserstoffsuspensionen eingesetzt werden, grundsätzlich nach dem gleichen Prinzip arbeiten, gibt es doch bei der Ausgestaltung der Sieböffnungen sehr große Unterschiede. Das ist darauf zurückzuführen, dass je nach Auflösegrad des Papierfaserstoffes und je nach Feinheit der darin mitgeführten auszusortierenden Feststoffe unterschiedliche Anforderungen erfüllt werden müssen. Die Sieböffnungen unterscheiden sich dabei nicht nur bezüglich ihrer Größe, sondern auch bezüglich ihrer Form. So gibt es bei Sieben zur Sortierung von Faserstoffsuspensionen seit langem die grundsätzliche Unterscheidung in Lochsiebe und Schlitzsiebe. Es hat sich herausgestellt, dass Lochsiebe bei der Grobsortierung von Faserstoffsuspensionen besonders günstig sind und hohe Durchsätze bei relativ hoher Konsistenz erlauben. Vorsortierung wird bei Faserstoffsuspensionen durchgeführt, in denen die sortierbaren Störstoffe einen Anteil von mindestens 0,3 % haben. Schlitzsiebe dagegen sind optimal bei der Feinsortierung. Das hängt unter anderem damit zusammen, dass die Papierfasern, die bei solchen Sortierverfahren das Sieb passieren sollen, eine längliche Form haben, während ein großer Teil der Verunreinigungen kubisch oder flächig ist. Bei der Auswahl eines geeigneten Siebes muss immer abgewogen werden zwischen den Forderungen nach einem hohen Durchsatz und der geforderten Sortierqualität. Beispiele für einen Lochsiebkorb zeigt die DE 196 35 189 und für einen Schlitzsiebkorb die DE 39 27 748 A1.Even if all sieves used to sort fiber suspensions, basically work according to the same principle, as there are in the design of the Screen openings very big differences. That is because depending on Degree of dissolution of the paper pulp and depending on the fineness of the carried Solids to be sorted out have to meet different requirements. The screen openings differ not only in terms of their size, but also also regarding their shape. So there are seven for sorting Fibrous suspensions have long been the basic distinction between perforated screens and Sieves. It has been found that perforated screens during the rough sorting of Fibrous suspensions are particularly cheap and high throughputs at relatively high Allow consistency. Pre-sorting is carried out for fiber suspensions, in of which the sortable contaminants have a share of at least 0.3%. sieves on the other hand are optimal for fine sorting. This is partly because that the paper fibers that are to pass through the screen in such sorting processes are one have elongated shape while a large part of the impurities are cubic or is flat. When choosing a suitable sieve, always weigh it up between the demands for high throughput and the demanded Sorting quality. Examples of a perforated screen basket are shown in DE 196 35 189 and a slotted screen basket DE 39 27 748 A1.
Aus der DE 198 15 449 A1 ist ein Siebkorb bekannt, der mit relativ engen Schlitzen versehen und damit im Wesentlichen zur Feinsortierung gedacht ist. Diese Schlitze verlaufen - anders als bei den üblichen Schlitzsiebkörben - nicht über die ganze axiale Erstreckung des Siebkorbes, sondern sind mehrfach unterteilt. Dadurch soll die Sortierqualität des Schlitzsiebkorbes verbessert werden. Siebkörbe dieser Art sind speziell auf die Entfernung von sehr schlecht aussortierbaren Stoffen, z.B. Stickies, optimiert. In der Regel wird das mit einem relativ geringen Durchsatz, bezogen auf die gesamte Siebfläche, erkauft. Außerdem verlangen Siebe dieser Art eine relativ geringe Stoffdichte. Sie sollte unter 2,5 %, möglichst um 1,5 % liegen. Anders ist es bei Lochsieben, die sich auch noch bei einer Konsistenz um und über 3 % betriebssicher und wirksam betreiben lassen. From DE 198 15 449 A1 a strainer basket is known which has relatively narrow slots provided and is essentially intended for fine sorting. These slots Unlike the usual slotted screen baskets, they do not run over the entire axial Extension of the strainer basket, but are divided several times. This is supposed to Sorting quality of the slotted screen basket can be improved. Sieve baskets of this type are especially for the removal of very poorly sorted substances, e.g. Stickies, optimized. As a rule, this is done with a relatively low throughput, based on the entire screen area, bought. Sieves of this type also require a relatively low one Consistency. It should be below 2.5%, if possible around 1.5%. It's different with Perforated screens, which are still with a consistency around and over 3% reliable and let it operate effectively.
Auch die aus der EP 0 455 312 A2 bekannten Siebkörbe sind offenbar zur Feinsortierung bestimmt. Konkrete Angaben für bevorzugte Beispiele liegen bei Schlitzweiten deutlich unter 1 mm. Zwar finden sich an anderen Stellen der Schrift auch andere Angaben, z.B. von "0,002 Zoll bis 0,35 Zoll oder mehr" also 0,05 mm bis 9 mm oder mehr. Das ist jedoch ein weiterer Bereich, und es wird nichts dazu gesagt, für welche Anwendungsfälle welche Auswahl getroffen werden soll. Die Publikation beschreibt in erster Linie Verfahren, um Schlitze oder Löcher zu erzeugen, deren Form und Größe für bestimmte Anwendungen günstig sind. In diesem Zusammenhang wird auch erläutert, dass sich mit dem neuen Herstellungsverfahren die Möglichkeit ergibt, auch ungewöhnliche Formen von Sieböffnungen zu erzeugen, wozu eine Anzahl von Beispielen aufgezählt wird.The screen baskets known from EP 0 455 312 A2 are apparently also available Fine sorting determined. Specific information for preferred examples is included Slot widths well below 1 mm. You can find it elsewhere in Scripture too other information, e.g. from "0.002 inches to 0.35 inches or more" that is 0.05 mm to 9 mm or more. However, that is another area and nothing is said for which use cases which selection should be made. The publication primarily describes methods to create slots or holes, their shape and size are convenient for certain applications. In this context, too explains that with the new manufacturing process, there is also the possibility to produce unusual shapes of screen openings, including a number of examples is enumerated.
Die DE 297 14 914 U1 zeigt Siebe, die für die Spuckstoffsortierung gedacht sind. Daher werden sie nicht in einen Drucksortierer eingebaut, sondern in eine Siebvorrichtung, die in der Einlaufkammer einen Luftraum aufweist, um einen stark eingedickten faserfreien Spuckstoff bilden zu können.DE 297 14 914 U1 shows sieves which are intended for sorting rejects. Therefore they are not installed in a pressure sorter, but in a screening device, which has an air space in the inlet chamber to a strongly thickened to be able to form fiber-free rejects.
Der Erfindung liegt die Aufgabe zu Grunde, die Verfahren zum Sortieren von Fasersuspensionen noch weiter zu verbessern, so dass ohne nennenswerte Einbußen der Sortierqualität der Durchsatz erhöht werden kann.The invention is based on the object, the method for sorting Fiber suspensions to improve even further, so that without significant loss of Sorting quality the throughput can be increased.
Diese Aufgabe wird durch die im Kennzeichen des Anspruchs 1 genannten Maßnahmen
erfüllt.This object is achieved by the measures mentioned in the characterizing part of
Es wurde außerdem festgestellt, dass bei erfindungsgemäß verwendeten Sieben der Langfasergehalt im Siebdurchlauf (Gutstoff) im Vergleich zu herkömmlichen Lochsieben erhöht wird. Daher kann das neue Verfahren auch mit einer besseren Trennschärfe arbeiten. Außerdem konnte ohne Qualitätsverlust eine deutlich größere Menge durchgesetzt werden.It was also found that in the sieves used according to the invention the Long fiber content in the sieve pass (good material) compared to conventional perforated sieves is increased. Therefore, the new method can also be used with better selectivity work. In addition, a significantly larger amount could be used without loss of quality be enforced.
Die Erfindung und ihre Vorteile werden erläutert an Hand von Zeichnungen; dabei zeigen:
- Fig. 1
- das Prinzip des Verfahrens bei Verwendung eines zylindrischen Siebkorbes;
- Fig. 2
- erfindungsgemäß gestaltete Sieböffnungen im Detail;
- Fig. 3
- einen Teil eines weiteren geeigneten Siebes.
- Fig. 1
- the principle of the method when using a cylindrical screen basket;
- Fig. 2
- Sieve openings designed according to the invention in detail;
- Fig. 3
- part of another suitable sieve.
Wie die Fig. 1 exemplarisch zeigt, kann das zur Durchführung des Verfahrens
verwendete Sieb 1 als zylindrischer Siebkorb (perspektivisch gezeichnet) ausgeführt
sein. Entscheidend für das Verfahren ist, dass die Sieböffnungen 3 in der in den
Ansprüchen beschriebenen Weise als Langlöcher ausgebildet sind. Dabei sind hier nur
einige wenige Langlöcher gezeichnet. Bekanntlich gibt es Siebkörbe, die Tausende
solcher Sieböffnungen haben. Um das Nasssieben einer Faserstoffsuspension S
durchzuführen, wird diese - bei dem hier gezeigten Beispiel - von oben in den vom
Siebkorb gebildeten Innenraum eingeleitet. Ein Teil dieser Faserstoffsuspension S kann
die Sieböffnungen 3 passieren und gelangt auf diese Weise in den Gutstoff A. Ein anderer
Teil, der zumindest teilweise aus den an den Sieböffnungen 3 abgewiesenen Stoffen
besteht, wird als Rejekt R unten aus dem Sieb 1 herausgeführt. Es versteht sich, dass
bei technischer Durchführung des Verfahrens ein das Sieb aufnehmende Gehäuse
vorhanden ist, um z.B. dem Sieb Halt zu geben und die Suspensionsströme in geeigneter
Weise zu führen. Da solche Drucksortierer hinreichend bekannt sind, wird auf die
Darstellung des Gehäuses verzichtet.As FIG. 1 shows by way of example, this can be used to carry out the
Wie schon erwähnt, wird in den meisten Fällen die Siebfreihaltung dadurch
gewährleistet, dass in unmittelbarer Nähe des Siebes mindestens ein Räumer daran
vorbei bewegt wird. Der Räumer 4 ist hier mit Flügelprofilen versehen, von denen nur
eines gezeichnet ist; bekanntlich sind auch andere Formen möglich. Der Räumer 4 wird
durch eine zentrale Welle 6 angetrieben und dadurch in der durch Pfeil angedeuteten
Bewegungsrichtung 5 von innen am Sieb vorbei bewegt. Es handelt sich also dabei um
eine Siebräumung an der Zulaufseite des Siebes, die besonders effektiv ist und bei der
Durchführung des Verfahrens bevorzugt wird. As already mentioned, this keeps sieve free in most cases
ensures that there is at least one scraper in the immediate vicinity of the sieve
is moved past. The
Die Sieböffnungen 3 haben die Form von Langlöchern, wie sie exemplarisch etwas
genauer in der Fig. 2 dargestellt sind. Sie haben eine Lochweite W, die zwischen 1 und 8
mm liegt, sowie eine Lochlänge L zwischen 1 und 50 mm. Die Lochlänge L ist mit Vorteil
mindestens doppelt so groß wie die Lochweite W. Ein wichtiges Maß kann auch der
Abstand A sein, den benachbarte Sieböffnungen 3 in Richtung ihrer Längserstreckung
voneinander haben. Hier sind Werte zwischen 1 und 6 mm besonders günstig, da sie
klein genug sind, um noch eine ausreichend große offene Siebfläche zu ermöglichen und
groß genug um die Langfaserverspinnung an den Siebstegen zu verhindern. Wie bereits
ausgeführt wurde, ist die Form und Größe solcher Sieböffnungen auf den
Verwendungszweck abzustimmen, wobei sich gezeigt hat, dass die angegebenen
Maßbereiche bei der Durchführung des Verfahrens optimale Ergebnisse liefern.The
Es wurde festgestellt, dass Siebkörbe für das Verfahren besonders gut geeignet sind,
wenn die Längserstreckung der Langlöcher so liegt, dass ihr Winkel α zur Achsrichtung
7 des Siebkorbes sehr viel größer ist als 0, vorzugsweise über 45°. Die Fig. 1 und 2
zeigen eine Form mit einem Winkel α von 90°.It was found that screen baskets are particularly well suited to the process,
if the longitudinal extent of the elongated holes is such that their angle α to the
Gemäß Fig. 3 lässt sich die Ausrichtung der Langlöcher auch bezüglich der
Räumerbewegung definieren. Die Zeichnung zeigt einen Winkel β, der, zwischen der
Längserstreckung der Langlöcher und der Bewegungsrichtung 5 des Räumers 4
gemessen, hier einen Wert von 30° hat. Bei dem in Fig 1 und 2 gezeigten Beispiel ist
die Längserstreckung der Langlöcher parallel zur Bewegungsrichtung 5 der Räumer 4
ausgerichtet (β=0), da die Räumer - wie üblich - rechtwinklig (α = 90°) zur
Achsrichtung des Siebkorbes bewegt werden. Wird das Verfahren in dieser Form
durchgeführt, gelangt ein relativ hoher Langfaseranteil in den Gutstoff. Die so
erzielbare gute Trennschärfe des Nasssiebens ist darauf zurückzuführen, dass
Ausrichtung, Größe und Form der Sieböffnungen optimal auf die Anforderungen einer
Faserstoffnasssiebung abgestimmt sind.3, the alignment of the elongated holes can also be done with respect to
Define reamer movement. The drawing shows an angle β, which, between the
Longitudinal extension of the elongated holes and the direction of
Bei der Durchführung der Erfindung können auch ebene Siebe eingesetzt werden, wie sie z.B. in entsprechend ausgeführten Sortierapparaten gebräuchlich sind. Denkbare Anwendungen sind auch Sekundärstofflöser und Pulperableermaschinen. Ein Beispiel für einen Sekundärpulper zeigt die DE 2345735.When carrying out the invention, flat sieves can also be used, as they are e.g. are used in suitably designed sorting apparatus. conceivable Applications are also secondary substance dissolver and pulper machine. An example for DE 2345735 shows a secondary pulper.
Es ist auch bekannt, die Sieboberfläche so zu profilieren, dass im Einlaufbereich zu den Sieböffnungen Wirbel erzeugt werden, die die Siebfreihaltung unterstützen.It is also known to profile the screen surface in such a way that in the inlet area to the Sieve openings vortices are generated that support the sieve clearance.
Verschmutzte Kartonagen wurden zu einer Suspension mit einer Konsistenz von ca. 3,5 % aufgelöst. Dieser Papierfaserstoff wurde dann in einem Drucksortierer mit Hilfe des erfindungsgemäßen Verfahrens sortiert. Der im Sortierer eingesetzte zylindrische Siebkorb war mit Langlöchern versehen, deren Weite 1,5 mm und Länge 4 mm betrug. Ihre Längserstreckung lag in Umfangsrichtung und war parallel zur Räumerbewegung. Die dabei gemessenen Werte wurden mit denen verglichen, die unter Einsatz eines Rundloch-Siebkorbes mit 1,4 mm Lochung anfielen, also mit einer Lochung, deren Durchmesser etwa der Siebweite des erfindungsgemäß verwendeten Siebkorbes entsprach.Soiled cardboard boxes became a suspension with a consistency of approx. 3.5 % resolved. This paper pulp was then processed in a pressure sorter using the sorted according to the inventive method. The cylindrical one used in the sorter The strainer basket was provided with elongated holes, the width of which was 1.5 mm and the length was 4 mm. Their longitudinal extent was in the circumferential direction and was parallel to the clearing movement. The measured values were compared with those using a Round-hole strainer basket with 1.4 mm perforation, i.e. with a perforation whose Diameter approximately the screen size of the screen basket used according to the invention corresponded.
Dabei wurde festgestellt, dass mit dem neuen Verfahren der auf die Bruttofläche bezogene Durchsatz fast verdoppelt werden konnte. Eine höherer volumetrischer Durchsatz ist ein starkes wirtschaftliches Argument. Gleichzeitig konnte die normalerweise unerwünschte Eindickung des Rejektes vom Faktor 1,6 auf den Faktor 1,2 bis 1,25 reduziert werden. Das ist teilweise darauf zurückzuführen, dass beim neuen Verfahren der Anteil der Langfasern im Rejekt um 40 % gesenkt werden konnte. Hier zeigt sich ein weiterer Vorteil des Verfahrens: Es können mehr Langfasern im Akzept verbleiben, was die Qualität des gereinigten Papierfaserstoffes beträchtlich erhöht. Trotz dieser Verbesserungen der Wirtschaftlichkeit wurde keine nennenswerte Verschlechterung des Sortiereffektes, also der Ausscheidung von Störstoffen festgestellt.It was found that the new method of applying to the gross area related throughput could almost be doubled. A higher volumetric Throughput is a strong economic argument. At the same time, the normally undesirable thickening of the reject from the factor 1.6 to the factor 1.2 to 1.25 can be reduced. This is partly due to the fact that the new process, the proportion of long fibers in the reject could be reduced by 40%. This shows another advantage of the process: more long fibers can be used in the Acceptance remains, which considerably improves the quality of the cleaned paper pulp elevated. Despite these improvements in profitability, none was worth mentioning Worsening of the sorting effect, i.e. the removal of contaminants.
Claims (17)
dadurch gekennzeichnet, dass ein Sieb (1) mit Sieböffnungen (3) verwendet wird, welche als Langlöcher ausgebildet sind, deren Lochweite (W) zwischen 1 und 8 mm, vorzugsweise zwischen 1 und 3 mm liegt.Process for wet sieving of fiber suspensions (S) using a sieve (1) with a plurality of sieve openings (3) through which the part of the fiber suspension accepted as wet sieve passes as accept (A), while the rejected as reject (R) separates from it is derived
characterized in that a sieve (1) with sieve openings (3) is used, which are designed as elongated holes, the hole width (W) of which is between 1 and 8 mm, preferably between 1 and 3 mm.
dadurch gekennzeichnet, dass die Lochweite (W) mindestens 1,5 mm groß ist.Method according to claim 1,
characterized in that the hole width (W) is at least 1.5 mm.
dadurch gekennzeichnet, dass die Langlöcher eine Lochlänge (L) zwischen 1 und 50 mm, vorzugsweise zwischen 2 und 5 mm aufweisen.Method according to claim 1 or 2,
characterized in that the elongated holes have a hole length (L) between 1 and 50 mm, preferably between 2 and 5 mm.
dadurch gekennzeichnet, dass das Verhältnis von Lochlänge (L) zu Lochweite (W) zwischen 2 und 20, vorzugsweise zwischen 2 und 10, liegt.The method of claim 1, 2 or 3,
characterized in that the ratio of hole length (L) to hole width (W) is between 2 and 20, preferably between 2 and 10.
dadurch gekennzeichnet, dass der Abstand (A), den benachbarte Langlöcher in Richtung ihrer Längserstreckung zueinander einnehmen, zwischen 1 und 6 mm beträgt. The method of claim 1, 2, 3 or 4,
characterized in that the distance (A) between adjacent elongated holes in the direction of their longitudinal extent to each other is between 1 and 6 mm.
dadurch gekennzeichnet, dass das Sieb (1) durch einen daran vorbeibewegten Räumer (4) freigehalten wird.The method of claim 1, 2, 3, 4 or 5,
characterized in that the screen (1) is kept clear by a scraper (4) moving past it.
dadurch gekennzeichnet, dass die Bewegungsrichtung (5) des Räumers (4) so gewählt wird, dass sie zur Längserstreckungsrichtung der Langlöcher einen Winkel (β) zwischen 0 und 75° einnimmt.Method according to claim 6,
characterized in that the direction of movement (5) of the reamer (4) is selected such that it makes an angle (β) between 0 and 75 ° to the longitudinal direction of the elongated holes.
dadurch gekennzeichnet, dass als Sieb (1) ein zylindrischer Siebkorb verwendet wird.Method according to one of the preceding claims,
characterized in that a cylindrical screen basket is used as the screen (1).
dadurch gekennzeichnet, dass die Richtung der Längserstreckung der Langlöcher einen Winkel (α) zur Achsrichtung (7) des Siebkorbes einnimmt, der zwischen 15° und 90° liegt.A method according to claim 8,
characterized in that the direction of the longitudinal extension of the elongated holes makes an angle (α) to the axial direction (7) of the screen basket which is between 15 ° and 90 °.
dadurch gekennzeichnet, dass der Winkel (α) größer ist als 45°.Method according to claim 9,
characterized in that the angle (α) is greater than 45 °.
dadurch gekennzeichnet, dass der Winkel (α) 90° beträgt.A method according to claim 10,
characterized in that the angle (α) is 90 °.
dadurch gekennzeichnet, dass die Faserstoffsuspension (S) eine Konsistenz von mindestens 2 % aufweist.Method according to one of the preceding claims,
characterized in that the fiber suspension (S) has a consistency of at least 2%.
dadurch gekennzeichnet, dass die Faserstoffsuspension (S) eine Konsistenz von mindestens 3 % aufweist.Method according to claim 12,
characterized in that the fibrous suspension (S) has a consistency of at least 3%.
dadurch gekennzeichnet, dass die Faserstoffsuspension (S) einen Gehalt an sortierbaren Störstoffen von mindestens 0,3 %, vorzugsweise mindestens 0,5 % aufweist.Method according to one of the preceding claims,
characterized in that the fiber suspension (S) has a sortable impurity content of at least 0.3%, preferably at least 0.5%.
dadurch gekennzeichnet, dass die Faserstoffsuspension (S) aus aufgelöstem Altpapier besteht.Method according to one of the preceding claims,
characterized in that the fibrous suspension (S) consists of dissolved waste paper.
dadurch gekennzeichnet, dass das Verfahren mit Hilfe mindestens eines Drucksortierers durchgeführt wird.Method according to one of the preceding claims,
characterized in that the method is carried out with the aid of at least one pressure sorter.
dadurch gekennzeichnet, dass aus dem Drucksortierer ein Rejekt in Form einer störstoffangereicherten Suspension entfernt wird.A method according to claim 16,
characterized in that a reject in the form of an impurity-enriched suspension is removed from the pressure sorter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10217926A DE10217926A1 (en) | 2002-04-23 | 2002-04-23 | Process for wet screening of fiber suspensions |
| DE10217926 | 2002-04-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1357222A1 true EP1357222A1 (en) | 2003-10-29 |
| EP1357222B1 EP1357222B1 (en) | 2007-01-24 |
Family
ID=28685236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03003474A Expired - Lifetime EP1357222B1 (en) | 2002-04-23 | 2003-02-15 | Process for wet screening fibrous suspensions |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20040004032A1 (en) |
| EP (1) | EP1357222B1 (en) |
| AT (1) | ATE352660T1 (en) |
| CA (1) | CA2426147A1 (en) |
| DE (2) | DE10217926A1 (en) |
| ES (1) | ES2279907T3 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1679403A1 (en) * | 2005-01-11 | 2006-07-12 | Voith Paper Patent GmbH | Pulper for comminuting and suspending papermaking material |
| EP2290160A1 (en) * | 2007-04-30 | 2011-03-02 | Voith Patent GmbH | Method for producing a filter, in particular a rigid filter for processing fibrous suspensions used for creating paper |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7263787B2 (en) * | 2005-07-19 | 2007-09-04 | Alliance Laundry Systems Llc | Laundry dryer with improved tumbler air flow passage openings |
| US7861544B2 (en) * | 2008-11-17 | 2011-01-04 | EcoloBlue, Inc. | Apparatus and methods for creating sparkling water from the atmosphere |
| DE102009015405A1 (en) * | 2009-03-27 | 2010-09-30 | Voith Patent Gmbh | scree |
| FI20095769A (en) * | 2009-07-07 | 2011-01-08 | Andritz Oy | Apparatus for handling a fiber suspension |
| US8565266B1 (en) | 2012-04-06 | 2013-10-22 | Casa Systems, Inc. | Intelligent node for improving signal quality in a cable modem network |
| US20130266310A1 (en) * | 2012-04-06 | 2013-10-10 | David B. Fox | Intelligent node for improving signal quality in a cable modem network |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0455312A2 (en) * | 1987-04-16 | 1991-11-06 | The Black Clawson Company | Screen plates |
| WO1996026315A1 (en) * | 1995-02-23 | 1996-08-29 | Ahlstrom Machinery Oy | A screen having inclined slots for use in a continuous digester |
| DE29714914U1 (en) * | 1997-08-20 | 1997-10-16 | Voith Sulzer Stoffaufbereitung | Screening device for sorting wet fibrous materials containing dirt |
| DE19815449A1 (en) * | 1998-04-07 | 1999-10-14 | Voith Sulzer Papiertech Patent | Sieve for sorting used paper fiber suspensions |
| US6165323A (en) * | 1999-02-10 | 2000-12-26 | Andritz-Ahlstrom Inc. | Screen plate having a plurality of inclined slots in a digester |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3713541A (en) * | 1971-05-10 | 1973-01-30 | Bird Machine Co | Screening machine with slotted screen |
| US3849302A (en) * | 1972-09-12 | 1974-11-19 | Black Clawson Co | Method and apparatus for screening paper fiber stock |
| US4885090A (en) * | 1987-04-16 | 1989-12-05 | The Black Clawson Company | Screen plates |
| US5064537A (en) * | 1987-04-16 | 1991-11-12 | The Black Clawson Company | Seamless screen cylinder with laser cut openings |
| US4901417A (en) * | 1987-08-05 | 1990-02-20 | The Black Clawson Company | Method of finishing screen plates |
| DE3927748C2 (en) * | 1989-08-23 | 1994-03-10 | Voith Gmbh J M | Process for producing a screen basket and screen basket produced according to this method |
| DE19635189C2 (en) * | 1996-08-30 | 1999-01-28 | Voith Sulzer Stoffaufbereitung | Process for the production of sieves |
-
2002
- 2002-04-23 DE DE10217926A patent/DE10217926A1/en not_active Withdrawn
-
2003
- 2003-02-15 ES ES03003474T patent/ES2279907T3/en not_active Expired - Lifetime
- 2003-02-15 DE DE50306345T patent/DE50306345D1/en not_active Expired - Fee Related
- 2003-02-15 AT AT03003474T patent/ATE352660T1/en not_active IP Right Cessation
- 2003-02-15 EP EP03003474A patent/EP1357222B1/en not_active Expired - Lifetime
- 2003-04-22 US US10/419,868 patent/US20040004032A1/en not_active Abandoned
- 2003-04-22 CA CA002426147A patent/CA2426147A1/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0455312A2 (en) * | 1987-04-16 | 1991-11-06 | The Black Clawson Company | Screen plates |
| WO1996026315A1 (en) * | 1995-02-23 | 1996-08-29 | Ahlstrom Machinery Oy | A screen having inclined slots for use in a continuous digester |
| DE29714914U1 (en) * | 1997-08-20 | 1997-10-16 | Voith Sulzer Stoffaufbereitung | Screening device for sorting wet fibrous materials containing dirt |
| DE19815449A1 (en) * | 1998-04-07 | 1999-10-14 | Voith Sulzer Papiertech Patent | Sieve for sorting used paper fiber suspensions |
| US6165323A (en) * | 1999-02-10 | 2000-12-26 | Andritz-Ahlstrom Inc. | Screen plate having a plurality of inclined slots in a digester |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1679403A1 (en) * | 2005-01-11 | 2006-07-12 | Voith Paper Patent GmbH | Pulper for comminuting and suspending papermaking material |
| EP2290160A1 (en) * | 2007-04-30 | 2011-03-02 | Voith Patent GmbH | Method for producing a filter, in particular a rigid filter for processing fibrous suspensions used for creating paper |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2426147A1 (en) | 2003-10-23 |
| ES2279907T3 (en) | 2007-09-01 |
| DE50306345D1 (en) | 2007-03-15 |
| US20040004032A1 (en) | 2004-01-08 |
| ATE352660T1 (en) | 2007-02-15 |
| DE10217926A1 (en) | 2003-11-13 |
| EP1357222B1 (en) | 2007-01-24 |
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