EP1702104B1 - Method for grinding water-suspended paper fibers or cellulose fibers - Google Patents

Method for grinding water-suspended paper fibers or cellulose fibers Download PDF

Info

Publication number
EP1702104B1
EP1702104B1 EP04820585A EP04820585A EP1702104B1 EP 1702104 B1 EP1702104 B1 EP 1702104B1 EP 04820585 A EP04820585 A EP 04820585A EP 04820585 A EP04820585 A EP 04820585A EP 1702104 B1 EP1702104 B1 EP 1702104B1
Authority
EP
European Patent Office
Prior art keywords
beating
faces
grinding
zone
cylinder
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.)
Not-in-force
Application number
EP04820585A
Other languages
German (de)
French (fr)
Other versions
EP1702104A1 (en
Inventor
Hans Schnell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1702104A1 publication Critical patent/EP1702104A1/en
Application granted granted Critical
Publication of EP1702104B1 publication Critical patent/EP1702104B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/34—Other mills or refiners
    • D21D1/38—Other mills or refiners with horizontal shaft

Definitions

  • the invention relates to a process for pulp treatment according to the preamble of claim 1.
  • the effect of the method can be controlled by changing the grinding parameters in a wide range, wherein in addition to the amount of grinding in particular also distinguishes whether a more cutting or more fibrillating grinding is desired.
  • pulp fibers are milled, their drainage resistance generally increases with increasing milling.
  • a common measure of the drainage resistance is the degree of grinding according to Schopper-Riegler.
  • the increase in the freeness has an unfavorable effect on sheet formation on the paper machine, but is tolerated, since the already mentioned quality characteristics of the pulp play a paramount role for its applicability.
  • the grinding parameters are selected so that the degree of freeness which has occurred in order to achieve the required fiber quality is as low as possible. This influence is very limited. In addition, the grinding can be economically unfavorable.
  • the invention is based on the object to provide a method for pulp treatment, with which it is possible to change pulp or paper fibers so that the strength of the paper produced therefrom are increased.
  • the occurring increase in the drainage resistance should be as low as possible in known grinding processes.
  • the method should be suitable for industrial grinding machines.
  • the grinding process works predominantly by compressive forces and avoids large relative movements of the grinding tools. As will be explained later, substantial fiber technological advantages can be achieved with the aid of such a milling process.
  • the grinding tools are not or only very little relative to each other moves in the grinding process considered here.
  • the actual milling stress is therefore due to compressive forces.
  • the method according to the invention can help to limit the size of the machine, since the effectiveness of the fiber treatment in the grinding zone can be substantially increased for the reasons mentioned.
  • the pressure forces in the grinding zone can be used for dewatering the paper fiber.
  • this primarily results in the water being either taken up by the porous grinding surface for a short time and later released again, or that water can flow off into other regions of the grinding device through the porous grinding surface.
  • the new method has several advantages:
  • the compressive force is transmitted to the fiber less damped and therefore used more to their technological change.
  • the fiber is fixed on the grinding surface, i. it is prevented from leaving the milling zone untreated. This effect occurs essentially independently of the fiber length.
  • more fibers can get into the milling zone, since the seeped water is missing.
  • the size of the grinding machine used can be reduced accordingly.
  • the fiber applies under considerable pressure to a provided with many small bumps surface, which can affect the grinding low.
  • the grinding surfaces are on grinding tools that perform a rotational movement, in such a way that the liquid picked up in the grinding zone of the pores is thrown off again after leaving the grinding zone.
  • the picking up of liquid and the centrifuging of the liquid can be carried out particularly effectively.
  • Particularly suitable materials for producing a porous grinding surface for carrying out the method are hard metals, chrome steel, plastics (eg polyethylene, GRP), ceramics or copper alloys. These materials can be sintered. As you know, but also from Composite materials targeted open-porous workpieces are produced, which are suitable for the application considered here.
  • the pore size can be individually adjusted according to requirements between 5 ⁇ m and 0.5 mm.
  • the new refining process alters the surface of the fibers to provide improved flexibility and bondability without the need to remove fibrils from the outer surface of the fibers. The production of fines, so fiber fragments, is avoided.
  • a particularly suitable apparatus for carrying out the method may comprise a rotating grinding cylinder 3, to which a number of grinding rollers 4 is pressed from the outside.
  • the grinding surfaces 1 and 2 are located on them.
  • the pressing force influences the grinding action and can therefore preferably be adjusted.
  • Fig. 1 shows a part of such a grinding device, in particular the point at which arises by the interaction of grinding cylinder 3 and grinding roller 4, a grinding zone.
  • both grinding cylinder and grinding roller are provided with grinding bars 5 and 6, of which only a part is shown. They extend substantially perpendicular to the direction of movement of the grinding tools and are distributed uniformly over the circumference.
  • the Mahlleisten are dimensioned and arranged so that in the grinding zone, the grinding bar 5 of a grinding tool extends into the spaces between the Mahlleisten 6 of the other grinding tool, whereby there reduces the volume between them and in the suspension therein S (indicated by an arrow ) a considerable pressure is built up.
  • Both the grinding strips and the associated cylindrical outer layer of the corresponding grinding tool are made here of porous material. Under certain circumstances, it is sufficient to produce only the Mahlleisten of porous material and to attach to the grinding cylinder or on the grinding roller.
  • the water in the grinding zone under increased pressure of the pulp suspension can penetrate into the pores of the grinding surface, whereby the pulp itself is thickened.
  • the volume lying between the grinding tools increases again, and the water W (indicated by an arrow) can escape from the pores again.
  • This effect is strongly supported by the fact that both grinding surfaces rotate, so that a centrifugal force acting perpendicular to the grinding surface is generated. Since the Mahlleisten form a toothing, within the grinding zone, the relative speed of the two grinding tools to each other low, which shearing movements and acting on the fibers shear forces are largely avoided.
  • the toothing also has a grinding technology effect, which is that the pressure forces acting on the fibers occur pulsating, which is in many cases required by grinding technology.
  • Fig. 2 Another application is shown in Fig. 2 with cylindrical grinding surfaces, ie those that are not provided with strips and roll to perform the process without slip or with little slip together. It can be seen in this illustration that the grinding cylinder 1 'is provided with a porous layer 8' and the grinding rollers 4 'with a porous material layer 7'. In another embodiment, not shown, it may also be sufficient that only one of the two grinding tools, which together form a grinding zone, has a porous grinding surface. This applies both to cylindrical grinding surfaces (see Fig. 2) and to strip-shaped (see Fig. 1).
  • the advantages offered by the method according to the invention are particularly effective when the grinding device is not completely filled with suspension during operation.
  • This principle is explained by way of example in FIG.
  • a grinding cylinder 3 to which a plurality of toothed grinding rollers 4 are pressed, two of which are shown here.
  • the grinding surfaces are porous. Since the housing of the grinding device is filled only to a small extent with suspension, the suspension S is thrown off centrifugal forces from the interdental spaces 20 into free space after leaving the grinding zone and reaches the next grinding roller. In free space, the liquid has a much higher density than the surrounding air. The water, which was pressed into the pores when passing through the grinding zone due to the porosity of the grinding surfaces, can now also be thrown out and reach the next grinding zone.
  • Fig. 3 also shows that the mill bars may be in the form of involute gearing, which optimizes the rolling conditions in the milling zone, but is somewhat more expensive to produce than e.g. the Mahlleisten shown in Fig. 1.
  • the grinding rollers 4 rotate here in a fixed slide 11.
  • the grinding cylinder 3 has at the axial end faces annular circumferential shoulders 12 which axially seal the volume formed between the grinding bars 5, 6 in the grinding zone.
  • the grinding device shown in Fig. 4 for carrying out the method is shown only schematically.
  • the suspension S is added through an inlet 14. This can be done over a wide nip or over a headbox, similar to that one knows from paper machines.
  • the addition point is located next to the material drain 13 and is separated by a guide plate 15 of this.
  • forced delivery is ensured over almost 360 ° over the entire circumferential course of the housing 16.
  • the suspension flow through this grinding device is defined and can be adjusted easily and safely.
  • the housing is preferably not completely included for the reasons already mentioned Filled suspension.
  • a suspension level can form on the material outlet 13.
  • the housing 10 can - as drawn here - inside cylindrical or be provided in accordance with FIG. 3 with a link 11 in which the grinding rollers rotate with a small gap distance.
  • a chamber on the back of the porous layer ie, the side of the layer opposite the grinding surface. This can be fed in case of need with pressurized water. Eventually, the water is mixed with suitable cleaning chemicals.
  • An easy way of realizing such a chamber 17 is shown in Fig. 5 by the example of a grinding cylinder 3 "peripherally surrounded by grinding rollers 4 '. and the cylinder body of the grinding cylinder 3 "spacer strips 18 are mounted, between which the volumes of the chambers 17 remain free. The rinse water is added through lines 19.
  • the chamber 17 shown in FIG. 5 and the lines 19 connected thereto can be used to remove water penetrated through the pores of the material layer 8 '. It is also a temporal sequence of drainage and - in case of need - flushing conceivable.

Landscapes

  • Paper (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

The method is used for refining a paper fiber suspension (S). This is refined chiefly by compressive forces between two refining surfaces ( 1, 2 ) that lie on refiner tools pressed against one another, since the refiner tools in the refining zone do not move or move very little relative to one another. The refining surfaces ( 1, 2 ) are embodied to be porous so that they can temporarily absorb or discharge part of the water (W) of the paper fiber suspension (S). An arrangement with central refiner cylinder ( 3 ) and refiner rolls ( 4 ) arranged on the periphery is particularly suitable as a device for carrying out the method. The refining surfaces can be embodied cylindrically or they can be provided with a toothing.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Faserstoffbehandlung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a process for pulp treatment according to the preamble of claim 1.

Seit langem ist bekannt, dass Zellstofffasern gemahlen werden müssen, damit das später daraus hergestellte Papier die gewünschten Eigenschaften, insbesondere Festigkeiten, Formation und Oberfläche, aufweist. Die weitaus am häufigsten verwendeten Mahlverfahren benutzen Mahlflächen, die mit als Messer bezeichneten Leisten versehen sind, die mit hoher Geschwindigkeit aneinander vorbei bewegt werden. Die entsprechenden Maschinen werden zumeist Messerrefiner genannt. Für Spezialfälle werden auch Mahlverfahren verwendet, bei denen mindestens eine der Mahlflächen messerlos ist, so dass die Mahlarbeit durch Reib- oder Scherkräfte übertragen wird.It has been known for a long time that pulp fibers must be ground so that the paper produced therefrom has the desired properties, in particular strength, formation and surface. By far the most widely used grinding methods use grinding surfaces provided with strips called knives, which are moved past each other at high speed. The corresponding machines are usually called knife refiner. For special cases, grinding processes are also used in which at least one of the grinding surfaces is not kneaded, so that the grinding work is transmitted by friction or shearing forces.

Die Wirkung des Verfahrens lässt sich durch Ändern der Mahlparameter in einem weiten Bereich steuern, wobei neben der Höhe der Ausmahlung insbesondere auch unterschieden wird, ob eine stärker schneidende oder stärker fibrillierende Mahlung gewünscht wird. Werden Zellstofffasern gemahlen, so steigt im Allgemeinen ihr Entwässerungswiderstand mit zunehmender Ausmahlung. Ein übliches Maß für den Entwässerungswiderstand ist der Mahlgrad nach Schopper-Riegler.The effect of the method can be controlled by changing the grinding parameters in a wide range, wherein in addition to the amount of grinding in particular also distinguishes whether a more cutting or more fibrillating grinding is desired. When pulp fibers are milled, their drainage resistance generally increases with increasing milling. A common measure of the drainage resistance is the degree of grinding according to Schopper-Riegler.

Die Erhöhung des Mahlgrades wirkt sich bei der Blattbildung auf der Papiermaschine ungünstig aus, wird aber hingenommen, da die bereits genannten Qualitätsmerkmale des Zellstoffes eine überragende Rolle für dessen Einsetzbarkeit spielen. In vielen Fällen werden die Mahlparameter so gewählt, dass der zur Erreichung der geforderten Faserqualität eingetretene Mahlgradanstieg möglichst gering ist. Diese Einflussmöglichkeit ist aber sehr begrenzt. Außerdem kann dadurch die Mahlung kraftwirtschaftlich ungünstiger werden.The increase in the freeness has an unfavorable effect on sheet formation on the paper machine, but is tolerated, since the already mentioned quality characteristics of the pulp play a paramount role for its applicability. In many cases, the grinding parameters are selected so that the degree of freeness which has occurred in order to achieve the required fiber quality is as low as possible. This influence is very limited. In addition, the grinding can be economically unfavorable.

Aus der US 4,685,623 ist ein Mahlverfahren bekannt, das mit weniger Energie auskommen soll. Die zu mahlende Papierfasersuspension wird in enge Keilspalten ("narrow nips") geführt, die sich zwischen einer rotierenden Zentralwalze und mehreren außen daran abrollenden Walzen bilden. Die Keilspalten sind sehr schmal, da die Zentralwalze mit einer Vielzahl von umlaufenden Nuten oder Rillen versehen ist. Die außen liegenden Walzen werden mit einer definierten Kraft gegen die Zentralwalze angedrückt, so dass im Keilspalt ein Entwässern und Quetschen der Fasern erfolgt. Dabei wird ein Teil der Suspension und das in den Keilspalten abgedrückte Wasser quer zur Bewegungsrichtung ab- und in diesen Rillen am eigentlichen Keilspalt vorbeigeführt, um später wieder mit dem bereits gemahlenen eingedickten Faserstoff vermischt zu werden. Auf diese Weise sollen Probleme bei dem Betrieb einer solchen Maschine auch bei größerem Durchsatz vermieden werden. Im Betrieb ist das Gehäuse dieser Apparatur mit Suspension voll gefüllt, welche mit einem einstellbaren Volumenstrom hindurchgepumpt wird.From the US 4,685,623 is a grinding process is known, which is to get by with less energy. The paper fiber suspension to be ground is guided into narrow wedge gaps ("narrow nips") which form between a rotating central roller and a plurality of rollers rolling on the outside thereof. The Wedge gaps are very narrow because the central roll is provided with a plurality of circumferential grooves or grooves. The outer rollers are pressed with a defined force against the central roller, so that occurs in the wedge gap dewatering and squeezing of the fibers. In this case, a portion of the suspension and the wracked in the wedge gaps water is transverse to the direction of movement and passed in these grooves on the actual wedge gap, to be later mixed again with the already ground thickened pulp. In this way, problems in the operation of such a machine are to be avoided even with a larger throughput. In operation, the housing of this apparatus is filled with suspension, which is pumped through with an adjustable volume flow.

Um während der Mahlung die Fasern in den Keilspalten festzuhalten, wird in der US-Schrift gefordert, dass die Breite der Keilspalte kleiner ist als die Faserlänge. Das bedeutet allerdings bei einer industriell eingesetzten Mahlmaschine einen hohen apparativen Aufwand.In order to hold the fibers in the wedge gaps during grinding, it is required in the US specification that the width of the wedge gaps is smaller than the fiber length. However, this means a high expenditure on equipment in an industrial grinding machine.

Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren zur Faserstoffbehandlung zu schaffen, mit dem es möglich ist, Zellstoff- oder Papierfasern so zu verändern, dass die Festigkeiten des daraus hergestellten Papiers erhöht werden. Die dabei auftretende Zunahme des Entwässerungswiderstandes soll möglichst geringer sein als bei bekannten Mahlverfahren. Das Verfahren soll für industrielle Mahlmaschinen geeignet sein.The invention is based on the object to provide a method for pulp treatment, with which it is possible to change pulp or paper fibers so that the strength of the paper produced therefrom are increased. The occurring increase in the drainage resistance should be as low as possible in known grinding processes. The method should be suitable for industrial grinding machines.

Diese Aufgabe wird durch die im Anspruch 1 genannten Merkmale gelöst.This object is achieved by the features mentioned in claim 1.

Das Mahlverfahren wirkt überwiegend durch Druckkräfte und vermeidet große Relativbewegungen der Mahlwerkzeuge. Wie später noch erläutert wird, können mit Hilfe eines solchen Mahlverfahrens wesentliche fasertechnologischen Vorteile erzielt werden.The grinding process works predominantly by compressive forces and avoids large relative movements of the grinding tools. As will be explained later, substantial fiber technological advantages can be achieved with the aid of such a milling process.

Anders als bei den üblichen Messerrefinern mit hoher Relativgeschwindigkeit zwischen den Mahlwerkzeugen, die zur Schnitt- und/oder Scherbeanspruchung der Fasern führen, werden bei dem hier betrachteten Mahlverfahren die Mahlwerkzeuge in der Mahlzone nicht oder nur sehr wenig relativ zueinander bewegt. Die eigentliche Mahlbeanspruchung erfolgt daher durch Druckkräfte. Es hat sich aber in vielen Fällen als problematisch erwiesen, Mahlverfahren dieser Art in industriellem Maßstab anzuwenden. Bei der Erzeugung von Papier oder Papier ähnlichen Produkten müssen nämlich ständig sehr große Mengen an Faserstoff für die Papiermaschine zur Verfügung gestellt werden. Soll wenigstens ein Teil der zur Papiererzeugung verwendeten Faserstoffe (es kann auch der gesamte Faserstoff sein) nach dem neuen Verfahren gemahlen werden, müssen die Maschinen für eine beträchtliche Produktionsmenge ausgelegt werden. Das erfindungsgemäße Verfahren kann beitragen, die Maschinengröße in Grenzen zu halten, da die Effektivität der Faserbehandlung in der Mahlzone aus den genannten Gründen wesentlich gesteigert werden kann.Unlike the conventional knife refiner with high relative speed between the grinding tools, which lead to the cutting and / or shear stress of the fibers, the grinding tools are not or only very little relative to each other moves in the grinding process considered here. The actual milling stress is therefore due to compressive forces. However, it has proved in many cases to be problematic to apply milling processes of this kind on an industrial scale. Namely, in the production of paper or paper-like products constantly very large amounts of pulp are made available for the paper machine. If at least part of the pulp used for papermaking (it may also be the entire pulp) are ground according to the new method, the machines must be designed for a considerable amount of production. The method according to the invention can help to limit the size of the machine, since the effectiveness of the fiber treatment in the grinding zone can be substantially increased for the reasons mentioned.

Die Druckkräfte in der Mahlzone können zur Entwässerung der Papierfaser genutzt werden. Beim erfindungsgemäßen Verfahren führt das in erster Linie dazu, dass das Wasser entweder kurzzeitig von der porösen Mahlfläche aufgenommen und später wieder abgegeben wird oder dass durch die poröse Mahlfläche Wasser in andere Bereiche der Mahlvorrichtung abfließen kann. Das neue Verfahren hat mehrere Vorteile:The pressure forces in the grinding zone can be used for dewatering the paper fiber. In the method according to the invention, this primarily results in the water being either taken up by the porous grinding surface for a short time and later released again, or that water can flow off into other regions of the grinding device through the porous grinding surface. The new method has several advantages:

Zunächst wird die Druckkraft weniger gedämpft auf die Faser übertragen und daher stärker zu ihrer technologischen Veränderung genutzt. Außerdem wird die Faser auf der Mahlfläche fixiert, d.h. sie wird daran gehindert, die Mahlzone unbehandelt zu verlassen. Dieser Effekt tritt im Wesentlichen unabhängig von der Faserlänge auf. Außerdem können bei gleichem Volumen mehr Fasern in die Mahlzone gelangen, da das abgedrückte Wasser fehlt. Dadurch lässt sich die Größe der verwendeten Mahlmaschine entsprechend reduzieren. Außerdem legt sich die Faser unter erheblichem Druck an eine mit vielen kleinen Unebenheiten versehene Oberfläche an, was die Mahlung günstig beeinflussen kann.First, the compressive force is transmitted to the fiber less damped and therefore used more to their technological change. In addition, the fiber is fixed on the grinding surface, i. it is prevented from leaving the milling zone untreated. This effect occurs essentially independently of the fiber length. In addition, with the same volume more fibers can get into the milling zone, since the seeped water is missing. As a result, the size of the grinding machine used can be reduced accordingly. In addition, the fiber applies under considerable pressure to a provided with many small bumps surface, which can affect the grinding low.

In typischen Anwendungsformen befinden sich die Mahlflächen auf Mahlwerkzeugen, die eine Rotationsbewegung ausführen, und zwar derart, dass die in der Mahlzone von den Poren aufgenommene Flüssigkeit nach Verlassen der Mahlzone wieder abgeschleudert wird. Insbesondere bei offenporigen Materialschichten, deren Poren nicht nur mit der Mahlfläche, sondern auch mit anderen Flächen in Verbindung stehen, kann das Aufnehmen von Flüssigkeit und das Abschleudern der Flüssigkeit besonders wirksam durchgeführt werden.In typical applications, the grinding surfaces are on grinding tools that perform a rotational movement, in such a way that the liquid picked up in the grinding zone of the pores is thrown off again after leaving the grinding zone. In particular, in the case of open-pore material layers whose pores are not only connected to the grinding surface but also to other surfaces, the picking up of liquid and the centrifuging of the liquid can be carried out particularly effectively.

Besonders geeignete Materialien, um eine poröse Mahlfläche zur Durchführung des Verfahrens zu erzeugen, sind Hartmetalle, Chromstahl, Kunststoffe (z.B. Polyäthylen, GFK), Keramik oder Kupferlegierungen. Diese Werkstoffe können gesintert werden. Bekanntlich können aber auch aus Verbundwerkstoffen gezielt offenporige Werkstücke erzeugt werden, die sich für den hier betrachteten Einsatz eignen. Die Porengröße kann individuell den Anforderungen entsprechend zwischen 5 µm und 0,5 mm eingestellt werden.Particularly suitable materials for producing a porous grinding surface for carrying out the method are hard metals, chrome steel, plastics (eg polyethylene, GRP), ceramics or copper alloys. These materials can be sintered. As you know, but also from Composite materials targeted open-porous workpieces are produced, which are suitable for the application considered here. The pore size can be individually adjusted according to requirements between 5 μm and 0.5 mm.

Die mahltechnologischen Vorteile des Verfahrens sind folgende:

  • 1. Die Faserlänge bleibt wesentlich besser erhalten.
  • 2. Die Faseroberfläche wird nicht oder bedeutend weniger fibrilliert
  • 3. Die spezifische Mahlarbeit zur Erreichung der gewünschten Festigkeiten ist im Allgemeinen geringer.
The grinding technology advantages of the method are as follows:
  • 1. The fiber length is much better preserved.
  • 2. The fiber surface is not or significantly less fibrillated
  • 3. The specific grinding work to achieve the desired strengths is generally lower.

Vergleichsversuche mit Langfaserzellstoff haben gezeigt, dass zur Erzielung einer Reißlänge von 8 km bei einer Messermahlung 45° SR Mahlgrad entstand und mit dem neuen Verfahren nur 18° SR. Die benötigte spezifische Mahlarbeit lag bis zu 50 % niedriger.Comparative tests with long-fiber pulp have shown that in order to achieve a breaking length of 8 km, 45 ° SR grinding was produced by knife grinding and only 18 ° SR with the new method. The required specific grinding work was up to 50% lower.

Es ist anzunehmen, dass durch das neue Mahlverfahren die Oberfläche der Fasern so verändert wird, dass sie eine verbesserte Flexibilität und Bindungsfähigkeit erhält, ohne dass Fibrillen aus der äußeren Oberfläche der Fasern herausgelöst werden müssen. Auch die Erzeugung von Feinstoff, also Faserbruchstücken, wird vermieden.It is believed that the new refining process alters the surface of the fibers to provide improved flexibility and bondability without the need to remove fibrils from the outer surface of the fibers. The production of fines, so fiber fragments, is avoided.

Wird das Verfahren auf rezyklierte Fasern angewendet, können die genannten Vorteile eine besondere Rolle spielen. Rezyklierte Fasern haben bereits mindestens einen, oft sogar mehrere Mahlvorgänge hinter sich, so dass jede weitere Zerkleinerung gerne vermieden wird.If the process is applied to recycled fibers, the advantages mentioned can play a special role. Recycled fibers already have at least one, often even several grinding operations behind them, so that any further comminution is gladly avoided.

Die Erfindung und ihre Vorteile werden erläutert an Hand von Zeichnungen. Dabei zeigen:

Fig. 1
Detailansicht einer Mahlzone mit leistenförmigen Mahlflächen zur Erläuterung des Verfahrens;
Fig. 2
eine Variante mit zylindrischen Mahlflächen;
Fig. 3
Teil einer speziellen Mahlvorrichtung;
Fig. 4
eine Mahlvorrichtung mit zentralem Mahlzylinder und peripher angeordneten Mahlwalzen;
Fig. 5
eine Mahlvorrichtung, bei der die poröse Schicht des Mahlzylinders mit rückseitigen Kammern versehen ist.
The invention and its advantages will be explained with reference to drawings. Showing:
Fig. 1
Detail view of a grinding zone with strip-shaped grinding surfaces to explain the process;
Fig. 2
a variant with cylindrical grinding surfaces;
Fig. 3
Part of a special grinding device;
Fig. 4
a grinding device with central grinding cylinder and peripherally arranged grinding rollers;
Fig. 5
a grinding apparatus in which the porous layer of the grinding cylinder is provided with back chambers.

Eine besonders geeignete Vorrichtung zur Durchführung des Verfahrens kann einen rotierenden Mahlzylinder 3 aufweisen, an den von außen eine Anzahl von Mahlwalzen 4 angedrückt wird. Auf ihnen befinden sich die Mahlflächen 1 bzw. 2. Die Andruckkraft beeinflusst dabei die Mahlwirkung und kann daher vorzugsweise eingestellt werden. Fig. 1 zeigt einen Teil einer solchen Mahlvorrichtung, insbesondere die Stelle, an der durch das Zusammenwirken von Mahlzylinder 3 und Mahlwalze 4 eine Mahlzone entsteht. Bei dem gezeigten Beispiel sind sowohl Mahlzylinder als auch Mahlwalze mit Mahlleisten 5 bzw. 6 versehen, von denen nur ein Teil eingezeichnet ist. Sie erstrecken sich im Wesentlichen rechtwinkelig zur Bewegungsrichtung der Mahlwerkzeuge und sind gleichmäßig über den Umfang verteilt. Dabei sind die Mahlleisten so dimensioniert und angeordnet, dass in der Mahlzone die Mahlleiste 5 eines Mahlwerkzeuges in die Zwischenräume zwischen den Mahlleisten 6 des anderen Mahlwerkzeuges hineinreicht, wodurch sich dort das dazwischen liegende Volumen verkleinert und in der darin befindlichen Suspension S (durch einen Pfeil angedeutet) ein beträchtlicher Druck aufgebaut wird. Sowohl die Mahlleisten als auch die mit ihnen verbundene zylindrische Außenschicht des entsprechenden Mahlwerkzeuges sind hier aus porösem Material gefertigt. Unter Umständen ist es ausreichend, nur die Mahlleisten aus porösem Material herzustellen und auf dem Mahlzylinder bzw. auf der Mahlwalze zu befestigen.A particularly suitable apparatus for carrying out the method may comprise a rotating grinding cylinder 3, to which a number of grinding rollers 4 is pressed from the outside. The grinding surfaces 1 and 2 are located on them. The pressing force influences the grinding action and can therefore preferably be adjusted. Fig. 1 shows a part of such a grinding device, in particular the point at which arises by the interaction of grinding cylinder 3 and grinding roller 4, a grinding zone. In the example shown, both grinding cylinder and grinding roller are provided with grinding bars 5 and 6, of which only a part is shown. They extend substantially perpendicular to the direction of movement of the grinding tools and are distributed uniformly over the circumference. The Mahlleisten are dimensioned and arranged so that in the grinding zone, the grinding bar 5 of a grinding tool extends into the spaces between the Mahlleisten 6 of the other grinding tool, whereby there reduces the volume between them and in the suspension therein S (indicated by an arrow ) a considerable pressure is built up. Both the grinding strips and the associated cylindrical outer layer of the corresponding grinding tool are made here of porous material. Under certain circumstances, it is sufficient to produce only the Mahlleisten of porous material and to attach to the grinding cylinder or on the grinding roller.

Wie bereits beschrieben wurde, kann das in der Mahlzone unter erhöhtem Druck stehende Wasser der Faserstoffsuspension in die Poren der Mahlfläche eindringen, wodurch der Faserstoff selbst eingedickt wird. Nach dem Durchlaufen der Mahlzone vergrößert sich das zwischen den Mahlwerkzeugen liegende Volumen wieder, und das Wasser W (durch einen Pfeil angedeutet) kann aus den Poren wieder austreten. Dieser Effekt wird dadurch stark unterstützt, dass beide Mahlflächen rotieren, so dass eine senkrecht zur Mahlfläche wirkende Zentrifugalkraft erzeugt wird. Da die Mahlleisten eine Verzahnung bilden, ist innerhalb der Mahlzone die Relativgeschwindigkeit der beiden Mahlwerkzeuge zueinander gering, wodurch Scherbewegungen und auf die Fasern wirkende Scherkräfte weitgehend vermieden werden. Die Verzahnung hat außerdem auch eine mahltechnologische Auswirkung, die darin liegt, dass die auf die Fasern einwirkenden Druckkräfte pulsierend auftreten, was in vielen Fällen mahltechnologisch erwünscht ist. Eine andere Anwendung zeigt die Fig. 2 mit zylindrischen Mahlflächen, also solchen, die nicht mit Leisten versehen sind und die zur Durchführung des Verfahrens schlupffrei oder mit geringem Schlupf aneinander abrollen. Man erkennt in dieser Darstellung, dass der Mahlzylinder 1' mit einer porösen Schicht 8' versehen ist und die Mahlwalzen 4' mit einer porösen Materialschicht 7'. In einer anderen nicht gezeigten Ausführungsform kann es auch ausreichen, dass nur eine der beiden Mahlwerkzeuge, die gemeinsam eine Mahlzone bilden, eine poröse Mahlfläche aufweist. Das gilt sowohl für zylindrische Mahlflächen (s. Fig. 2) als auch für leistenförmige (s. Fig. 1).As already described, the water in the grinding zone under increased pressure of the pulp suspension can penetrate into the pores of the grinding surface, whereby the pulp itself is thickened. After passing through the grinding zone, the volume lying between the grinding tools increases again, and the water W (indicated by an arrow) can escape from the pores again. This effect is strongly supported by the fact that both grinding surfaces rotate, so that a centrifugal force acting perpendicular to the grinding surface is generated. Since the Mahlleisten form a toothing, within the grinding zone, the relative speed of the two grinding tools to each other low, which shearing movements and acting on the fibers shear forces are largely avoided. The toothing also has a grinding technology effect, which is that the pressure forces acting on the fibers occur pulsating, which is in many cases required by grinding technology. Another application is shown in Fig. 2 with cylindrical grinding surfaces, ie those that are not provided with strips and roll to perform the process without slip or with little slip together. It can be seen in this illustration that the grinding cylinder 1 'is provided with a porous layer 8' and the grinding rollers 4 'with a porous material layer 7'. In another embodiment, not shown, it may also be sufficient that only one of the two grinding tools, which together form a grinding zone, has a porous grinding surface. This applies both to cylindrical grinding surfaces (see Fig. 2) and to strip-shaped (see Fig. 1).

Die Vorteile, die sich durch das erfindungsgemäße Verfahren bieten, kommen besonders zur Geltung, wenn die Mahlvorrichtung im Betrieb nicht vollständig mit Suspension gefüllt ist. Dieses Prinzip wird an der Fig. 3 exemplarisch erklärt. Man erkennt wiederum einen Mahlzylinder 3, an den mehrere mit diesem verzahnte Mahlwalzen 4 angedrückt werden, von denen hier zwei eingezeichnet sind. Die Mahlflächen sind porös. Da das Gehäuse der Mahlvorrichtung nur zu einem geringen Teil mit Suspension gefüllt ist, wird die Suspension S nach Verlassen der Mahlzone durch Fliehkräfte aus den Zahnzwischenräumen 20 in den freien Raum abgeschleudert und gelangt zur nächsten Mahlwalze. Im freien Raum hat die Flüssigkeit eine wesentlich höhere Dichte als die sie umgebende Luft. Das Wasser, das wegen der Porosität der Mahlflächen beim Durchgang durch die Mahlzone in die Poren gedrückt wurde, kann nun ebenfalls herausgeschleudert werden und zur nächsten Mahlzone gelangen. Die Fig. 3 zeigt darüber hinaus, dass die Mahlleisten die Form einer Evolventenverzahnung haben können, was die Abwälzbedingungen in der Mahlzone optimiert, allerdings bei der Herstellung etwas aufwändiger ist als z.B. die in Fig. 1 gezeigten Mahlleisten. Die Mahlwalzen 4 rotieren hier in einer feststehenden Kulisse 11. Der Mahlzylinder 3 weist an den axialen Stirnseiten ringförmige umlaufende Schultern 12 auf, die das zwischen den Mahlleisten 5, 6 in der Mahlzone gebildete Volumen axial abdichten.The advantages offered by the method according to the invention are particularly effective when the grinding device is not completely filled with suspension during operation. This principle is explained by way of example in FIG. In turn, one recognizes a grinding cylinder 3, to which a plurality of toothed grinding rollers 4 are pressed, two of which are shown here. The grinding surfaces are porous. Since the housing of the grinding device is filled only to a small extent with suspension, the suspension S is thrown off centrifugal forces from the interdental spaces 20 into free space after leaving the grinding zone and reaches the next grinding roller. In free space, the liquid has a much higher density than the surrounding air. The water, which was pressed into the pores when passing through the grinding zone due to the porosity of the grinding surfaces, can now also be thrown out and reach the next grinding zone. Fig. 3 also shows that the mill bars may be in the form of involute gearing, which optimizes the rolling conditions in the milling zone, but is somewhat more expensive to produce than e.g. the Mahlleisten shown in Fig. 1. The grinding rollers 4 rotate here in a fixed slide 11. The grinding cylinder 3 has at the axial end faces annular circumferential shoulders 12 which axially seal the volume formed between the grinding bars 5, 6 in the grinding zone.

Die in Fig. 4 gezeigte Mahlvorrichtung zur Durchführung des Verfahrens ist nur schematisch dargestellt. Man erkennt einen horizontal liegenden Mahlzylinder 3, auf dem sich mehrere überwiegend gleichmäßig über den Umfang verteilt angeordnete Mahlwalzen 4 befinden, wobei im Bereich des Stoffabflusses 13 eine Lücke 9 ohne Mahlwalze gelassen ist. Die Suspension S wird durch einen Zulauf 14 zugegeben. Das kann über einen Breitspalt erfolgen oder über einen Stoffauflauf, ähnlich wie man ihn von Papiermaschinen kennt. Die Zugabestelle liegt neben dem Stoffabfluss 13 und ist durch ein Führungsblech 15 von diesem abgetrennt. So ist eine Zwangsförderung über fast 360° über den ganzen Umfangsverlauf des Gehäuses 16 gewährleistet. Der Suspensionsstrom durch diese Mahlvorrichtung ist definiert und kann leicht und sicher eingestellt werden. Das Gehäuse ist aus den schon genannten Gründen vorzugsweise nicht vollständig mit Suspension gefüllt. Es kann sich aber ein Suspensionsspiegel am Stoffabfluss 13 bilden. Das Gehäuse 10 kann - wie hier gezeichnet - innen zylindrisch oder gemäß Fig. 3 mit einer Kulisse 11 versehen sein, in der die Mahlwalzen mit geringem Spaltabstand rotieren.The grinding device shown in Fig. 4 for carrying out the method is shown only schematically. One recognizes a horizontal grinding cylinder 3, on which a plurality of predominantly uniformly distributed over the circumference arranged grinding rollers 4 are located, wherein in the region of the material outflow 13 a gap 9 is left without grinding roller. The suspension S is added through an inlet 14. This can be done over a wide nip or over a headbox, similar to that one knows from paper machines. The addition point is located next to the material drain 13 and is separated by a guide plate 15 of this. Thus, forced delivery is ensured over almost 360 ° over the entire circumferential course of the housing 16. The suspension flow through this grinding device is defined and can be adjusted easily and safely. The housing is preferably not completely included for the reasons already mentioned Filled suspension. However, a suspension level can form on the material outlet 13. The housing 10 can - as drawn here - inside cylindrical or be provided in accordance with FIG. 3 with a link 11 in which the grinding rollers rotate with a small gap distance.

Es ist ohne weiteres möglich, poröse Schichten zu erzeugen, bei denen die Kapillaren-Hohlräume miteinander verbunden sind. Die Entwässerungswirkung lässt sich entscheidend verbessern, wenn das in die Poren hinein gedrückte Wasser nach Verlassen der Mahlzone wieder entfernt wird. Dazu können z.B. Fliehkräfte genutzt werden. Das Wasser wird dann nicht wie z.B. bei Filterelementen ständig in einer Richtung durch die Poren hindurch gedrückt. Vielmehr dienen die Poren als Speichervolumen mit einer Strömungsumkehrung, die die anhaftenden oder eventuell eingedrungenen Feinstoffe sofort wieder fortspült.It is readily possible to produce porous layers in which the capillary cavities are interconnected. The dewatering effect can be decisively improved if the water pressed into the pores is removed again after leaving the grinding zone. For this, e.g. Centrifugal forces are used. The water is then not such. For filter elements constantly pressed in one direction through the pores. Rather, the pores serve as storage volume with a flow reversal, which immediately rinses away the adhering or possibly penetrated fines.

Es ist leicht einzusehen, dass die Entwässerungswirkung der porösen Mahlfläche besonders dann wirksam einsetzen kann, wenn es gelingt, die Poren von Verstopfungen frei zu halten. Um eventuell diesbezügliche Schwierigkeiten zu vermeiden, kann es zweckmäßig sein, auf der Rückseite der porösen Schicht (also der der Mahlfläche gegenüber liegenden Seite der Schicht) eine Kammer vorzusehen. Diese kann im Bedarfsfalle mit unter Druck stehendem Wasser gespeist werden. Eventuell wird das Wasser mit geeigneten Reinigungschemikalien vermischt. Eine einfache Möglichkeit, eine solche Kammer 17 zu realisieren, zeigt die Fig. 5 am Beispiel eines Mahlzylinders 3", der peripher mit Mahlwalzen 4'umgeben ist. Bei diesem Beispiel werden die Kammern 17 dadurch gebildet, dass zwischen der durchgehend porösen Materialschicht 8' und dem Zylinderkörper des Mahlzylinders 3" Abstandsleisten 18 angebracht sind, zwischen denen die Volumina der Kammern 17 frei bleiben. Das Spülwasser wird durch Leitungen 19 zugegeben.It is easy to see that the drainage effect of the porous grinding surface can be particularly effective if it is possible to keep the pores free of blockages. In order to avoid any difficulties in this regard, it may be expedient to provide a chamber on the back of the porous layer (ie, the side of the layer opposite the grinding surface). This can be fed in case of need with pressurized water. Eventually, the water is mixed with suitable cleaning chemicals. An easy way of realizing such a chamber 17 is shown in Fig. 5 by the example of a grinding cylinder 3 "peripherally surrounded by grinding rollers 4 '. and the cylinder body of the grinding cylinder 3 "spacer strips 18 are mounted, between which the volumes of the chambers 17 remain free. The rinse water is added through lines 19.

In einer weiteren Ausgestaltung des Verfahrens können die in Fig. 5 gezeigte Kammer 17 und die damit verbundenen Leitungen 19 zur Abfuhr von durch die Poren der Materialschicht 8' hindurch gedrungenes Wasser genutzt werden. Es ist auch eine zeitliche Abfolge von Entwässerung und - im Bedarfsfall - Spülung denkbar.In a further embodiment of the method, the chamber 17 shown in FIG. 5 and the lines 19 connected thereto can be used to remove water penetrated through the pores of the material layer 8 '. It is also a temporal sequence of drainage and - in case of need - flushing conceivable.

Selbstverständlich kann diese hier an zylindrischen Mahlflächen gezeigte Ausführungsform mit Kammern 17 auch an anderen Mahlflächen-Formen verwendet werden.Of course, this embodiment shown here on cylindrical grinding surfaces with chambers 17 can also be used on other grinding surface shapes.

Claims (34)

  1. Method for beating aqueously suspended paper fibres or pulp fibres, in which method the fibrous substance is guided through at least one beating zone which is situated between beating faces (1, 2),
    in which method the beating faces (1, 2) are situated on beating tools which are pressed against one another, as a result of which mechanical beating work is transmitted to the fibres in such a way that the strengths of the paper which is produced as a result are changed, with the beating faces (1, 2) being moved relative to one another in such a way that the relative speed between the fibrous substance and the beating faces, as viewed in the main direction of motion of the beating faces, at the point at which two beating faces (1, 2) in the beating zone are closest to one another, is at most 10% of the absolute speed of the beating face which is moved most quickly,
    characterized
    in that at least one of the beating faces (1, 2) which interact in the beating zone is porous.
  2. Method according to Claim 1,
    characterized
    in that both of the beating faces (1, 2) which interact in the beating zone are porous.
  3. Method according to Claim 1 or 2,
    characterized
    in that the porous beating face (1, 2) is formed by at least one material layer (7, 7', 8, 8') which is open-pored towards the beating face (1, 2).
  4. Method according to Claim 3,
    characterized
    in that the material layer (7, 7', 8, 8') is composed of sintered material.
  5. Method according to Claim 4,
    characterized
    in that the material layer (7, 7', 8, 8') is composed predominantly of chrome steel.
  6. Method according to Claim 4,
    characterized
    in that the material layer (7, 7', 8, 8') is composed predominantly of hard metal.
  7. Method according to Claim 4,
    characterized
    in that the material layer (7, 7', 8, 8') is composed predominantly of a copper alloy.
  8. Method according to Claim 4,
    characterized
    in that the material layer (7, 7', 8, 8') is composed predominantly of ceramic.
  9. Method according to Claim 4,
    characterized
    in that the material layer (7, 7', 8, 8') is composed predominantly of plastic.
  10. Method according to one of Claims 3 to 9,
    characterized
    in that the layer thickness of the material layer (7, 7', 8, 8') is at least 1 mm and at most 30 mm, preferably 10 - 20 mm.
  11. Method according to one of the preceding claims,
    characterized
    in that the mean pore width of the porous beating face (1, 2) is less than 0.5 mm.
  12. Method according to one of the preceding claims,
    characterized
    in that the relative speed between the fibrous substance and the beating faces, as viewed in the main direction of motion of the beating faces (1, 2), at the point at which two beating faces (1, 2) in the beating zone are closest to one another, is less than 5% of the absolute speed of the beating face (1, 2) which is moved most quickly.
  13. Method according to one of Claims 1 to 11,
    characterized
    in that the relative movement of the beating faces (1, 2) in the beating zone is a rolling movement.
  14. Method according to one of the preceding claims,
    characterized
    in that the mechanical beating work is transmitted by compression of the fibrous substance.
  15. Method according to one of the preceding claims,
    characterized
    in that at least one beating face (1, 2) is provided with beating strips (5, 5', 6, 6') which run transversely with respect to the main direction of motion of the moved beating face.
  16. Method according to Claim 15,
    characterized
    in that the beating strips (5, 5', 6, 6') have a height of at least 2 mm and a width, in the direction of motion of the moved beating faces, of at least 2 mm.
  17. Method according to Claim 15 or 16,
    characterized
    in that both beating faces (1, 2) are provided with transversely-running beating strips (5, 5', 6, 6').
  18. Method according to one of the preceding claims,
    characterized
    in that the absolute speed of at least one beating face (1, 2) is held at a value of between 5 and 30 m/sec.
  19. Method according to one of the preceding claims,
    characterized
    in that the beating faces (1, 2) are pressed against one another in such a way that a linear force of between 2 and 10 N/mm is generated in the beating zone.
  20. Method according to one of the preceding claims,
    characterized
    in that at least one of the beating tools has, on the beating face (1, 2), spaces, in particular tooth spaces (20), which are moved in the beating zone in such a way that they transport the suspension (S) through the beating zone in the direction of motion of the beating tools.
  21. Method according to Claim 20,
    characterized
    in that the spaces are emptied of the fibres outside the beating zone.
  22. Method according to Claim 21,
    characterized
    in that the emptying of the spaces takes place by means of centrifugal forces.
  23. Method according to Claim 20, 21 or 22,
    characterized
    in that one of the beating tools is a beating cylinder (3, 3', 3"), and in that the other beating tools are beating rollers (4, 4') which are arranged parallel to said beating cylinder (3, 3', 3") and which, at the peripheral face of the beating cylinder (3, 3'), are set in a rolling motion.
  24. Method according to Claim 23,
    characterized
    in that the beating cylinder (3, 3', 3") is driven, and in that the beating rollers (4, 4') rotate about spatially fixed axes.
  25. Method according to Claim 23 or 24,
    characterized
    in that the beating cylinder (3', 3") is provided with a cylindrical porous surface, and in that the spaces are situated on the periphery of the beating roller.
  26. Method according to one of Claims 23 to 25,
    characterized
    in that the beating cylinder (3, 3', 3'') and beating rollers (4, 4') lie substantially horizontally, and in that the direction of the suspension transport through the beating device which is used is substantially that of the peripheral direction of the beating cylinder.
  27. Method according to one of the preceding claims,
    characterized
    in that the pressure forces for beating the paper or pulp fibres are transmitted to faces at which the beating tools roll on one another.
  28. Method according to one of Claims 23 to 27,
    characterized
    in that the diameter of the beating cylinder (3, 3', 3'') is at least 1.5 times, preferably double the diameter of the beating roller (4, 4').
  29. Method according to Claim 28,
    characterized
    in that the beating rollers are arranged, at the periphery of the beating cylinder (3, 3', 3''), closely adjacent to one another such that as many beating zones as possible are formed on one beating cylinder.
  30. Method according to one of the preceding claims,
    characterized
    in that the beating is carried out on a suspension which is guided continuously through the beating device which is used.
  31. Method according to one of the preceding claims,
    characterized
    in that the aqueous suspension is supplied into the beating device which is used with a consistency of 1 - 6 %.
  32. Method according to one of Claims 1 to 30,
    characterized
    in that the aqueous suspension is supplied into the beating device which is used with a consistency of 6 - 15 %.
  33. Method according to one of Claims 1 to 30,
    characterized
    in that the aqueous suspension is supplied into the beating device which is used with a consistency of 15 - 25 %.
  34. Method according to one of the preceding claims,
    characterized
    in that the force with which the beating tools which form in each case one beating zone are pressed together is adjustable, in particular diversely adjustable for different beating zones.
EP04820585A 2003-12-12 2004-11-11 Method for grinding water-suspended paper fibers or cellulose fibers Not-in-force EP1702104B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10358217 2003-12-12
PCT/EP2004/012762 WO2005061783A1 (en) 2003-12-12 2004-11-11 Method for grinding water-suspended paper fibers or cellulose fibers

Publications (2)

Publication Number Publication Date
EP1702104A1 EP1702104A1 (en) 2006-09-20
EP1702104B1 true EP1702104B1 (en) 2007-12-19

Family

ID=34706281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04820585A Not-in-force EP1702104B1 (en) 2003-12-12 2004-11-11 Method for grinding water-suspended paper fibers or cellulose fibers

Country Status (7)

Country Link
US (1) US20070090209A1 (en)
EP (1) EP1702104B1 (en)
AT (1) ATE381637T1 (en)
BR (1) BRPI0417436A (en)
DE (1) DE502004005776D1 (en)
PT (1) PT1702104E (en)
WO (1) WO2005061783A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT505904B1 (en) * 2007-09-21 2009-05-15 Chemiefaser Lenzing Ag CELLULOSE SUSPENSION AND METHOD FOR THE PRODUCTION THEREOF

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4309246A (en) * 1977-06-20 1982-01-05 Crown Zellerbach Corporation Papermaking apparatus and method
US4685623A (en) * 1982-09-29 1987-08-11 Clark James D A Method and apparatus for treating pulp
FI98079C (en) * 1995-07-07 1997-04-10 Martti Wilhelm Somervuori Paper machine suction roller suction box

Also Published As

Publication number Publication date
US20070090209A1 (en) 2007-04-26
PT1702104E (en) 2008-02-08
ATE381637T1 (en) 2008-01-15
BRPI0417436A (en) 2007-03-06
EP1702104A1 (en) 2006-09-20
WO2005061783A1 (en) 2005-07-07
DE502004005776D1 (en) 2008-01-31

Similar Documents

Publication Publication Date Title
EP0143414B2 (en) Pelletizing machine
DE2053419A1 (en) Method and apparatus for grinding paper stock
EP0456788B1 (en) Sieve for a pressure sorting device for fibre suspensions
DE10236962A1 (en) Papermaking process compresses slow-speed fibers between a roller with shallow transverse grooves and a smooth interface
WO2011076660A1 (en) Method and screening device for screening a fiber suspension
EP3398683B1 (en) Refiner element for the refining of fibrous material
EP1702104B1 (en) Method for grinding water-suspended paper fibers or cellulose fibers
EP1702103A1 (en) Method for refining paper or cellulose fibres in an aqueous suspension
DE102005016192A1 (en) Process for dissolving and cleaning contaminant-containing paper tubes
DE102008039003A1 (en) Method for grinding water-suspended cellulose fibers, involves guiding fibers in aqueous suspension between grinding sets provided with grinding blocks
AT412483B (en) METHOD AND DEVICE FOR MOORING FIBROUS MATERIALS
DE102005016318A1 (en) Process for grinding aqueous suspended paper or pulp fibers and grinding device for its implementation
DE10356377A1 (en) Paper mill has a toothed drum rotating and intermeshing with voids formed by teeth on outer rollers
DE10337921A1 (en) Refining assembly, for a suspension of papermaking paper/cellulose fibers, forms a fiber layer on the inner surface of the rotating drum with beater rollers pressed against it and a constant liquid flow in and out of the layer
EP0863252B1 (en) Process and apparatus to dewater a fiber suspension
EP0779391B1 (en) Method for milling paper fibres
AT520178B1 (en) Apparatus and method for producing nanocellulose
DE19808355A1 (en) Paper fiber suspension grinding operation for papermaking fibers
WO2004050988A1 (en) Method and device for treating fibrous material
DE2061519A1 (en) Processing machine for cellular material or the like
WO2022063643A1 (en) Refiner plate segment
AT221921B (en) Processing device for pulpy materials, in particular raw material for paper manufacture
DE102019107693A1 (en) Pressure sorter
DE1561639A1 (en) Kegelstoffmuehle
DE1900775U (en) SCREW PRESS FOR THE SHAPING OF PLASTIC MATERIALS SUCH AS PLASTICS, TRAP MATERIALS, EARTHY MASSES OR. DGL.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20060712

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: CH

Ref legal event code: NV

Representative=s name: E. BLUM & CO. AG PATENT- UND MARKENANWAELTE VSP

REF Corresponds to:

Ref document number: 502004005776

Country of ref document: DE

Date of ref document: 20080131

Kind code of ref document: P

REG Reference to a national code

Ref country code: PT

Ref legal event code: SC4A

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 20080128

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20080305

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071219

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071219

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080419

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080330

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071219

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071219

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071219

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071219

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071219

26N No opposition filed

Effective date: 20080922

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080320

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071219

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080319

BERE Be: lapsed

Owner name: VOITH PATENT G.M.B.H.

Effective date: 20081130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081130

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20081111

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081111

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071219

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090601

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20090601

REG Reference to a national code

Ref country code: PT

Ref legal event code: MM4A

Free format text: LAPSE DUE TO NON-PAYMENT OF FEES

Effective date: 20090811

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20090731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090811

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081130

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081130

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090603

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081111

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081111

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081112

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081111

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080620

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071219

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081130