EP0779391A1 - Method for milling paper fibres - Google Patents

Method for milling paper fibres Download PDF

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Publication number
EP0779391A1
EP0779391A1 EP96115697A EP96115697A EP0779391A1 EP 0779391 A1 EP0779391 A1 EP 0779391A1 EP 96115697 A EP96115697 A EP 96115697A EP 96115697 A EP96115697 A EP 96115697A EP 0779391 A1 EP0779391 A1 EP 0779391A1
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Prior art keywords
grinding
tools
stage
primary
carried out
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EP96115697A
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German (de)
French (fr)
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EP0779391B1 (en
Inventor
Frank Peter Dr. Meltzer
Josef Schneid
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Voith Paper Fiber and Environmental Solutions GmbH and Co KG
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Voith Sulzer Stoffaufbereitung GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills

Definitions

  • the invention relates to a method for grinding paper fibers according to the preamble of claim 1.
  • the grinding tools used for grinding are also called sets and installed in grinding machines - so-called refiners.
  • Such grinding machines have at least one rotor and at least one stator with either disc-ring or truncated cone-shaped surfaces on which the grinding tools or fittings are attached, so that grinding gaps can form between them.
  • Point Grinding tools on the work surfaces webs and grooves one speaks of "knife sets”.
  • grinding tools in which the grinding surfaces facing the material flow have a hard, porous structure with a roughness depth of one tenth to about three millimeters. Between these grinding surfaces there are often still a few channels for material guidance. The structure must not change too much over time. So it must not become smooth even with increasing wear of the clothing.
  • the wear of the grinding tools used in the process should also be as low as possible.
  • the hard-pored grinding surfaces mentioned are present on at least one side of the grinding tools. It is possible to have grinding surfaces of this type work against conventional knife sets. In such a case, the channels located between the knife bars can ensure sufficient transport of the pulp suspension to be ground, for example also without channels being required on the porous grinding surface. Then, due to the hard-pore grinding tool opposite the knife bars, the particularly favorable abrasive grinding treatment takes place. Of the Mass transfer in the grinding machine is increased if the knife set of such a combination is attached to the rotor. Given the large number of possible requirements for grinding development, it is up to the person skilled in the art to design grinding tools that move relative to one another, taking into account the characteristics specified in the claims.
  • each grinding stage can be controlled separately in terms of performance, i.e. optimally adapted to the specific grinding task of this stage and the properties of the grinding surfaces. Furthermore, the grinding becomes more uniform. In addition, it is often advantageous in the method if only a relatively low specific grinding work (kWh / to) is transferred per machine.
  • Fig. 1 shows the primary grinding stage 1 and the following secondary grinding stage 2.
  • the suspension flow with the paper fibers F is indicated as an arrow, which runs through both grinding stages.
  • the example shown is a realization with disc refiners.
  • grinding tools 3 and 3 ' are used which move relative to one another.
  • a stator 7 and a rotor 8 are indicated, which are positioned and movable relative to one another, the actual grinding gap S being formed between the grinding tools 3 and 3 'located on them.
  • two hard-pore grinding tools work against each other.
  • the pulp pre-ground in the primary grinding stage 1 then passes into the secondary grinding stage 2.
  • This is equipped with the grinding tools 4 and 4 ', in each case as conventional knife sets, which are attached to a stator 9 or rotor 10.
  • Fig. 1 The embodiment shown in Fig. 1 is only one of the conceivable possibilities.
  • FIG. 2 shows a variant in which the primary grinding stage 1 has both a hard-pored grinding tool 3 and a grinding tool 3 ′ provided with grinding strips 6.
  • the knife set is attached to the rotor 8, which leads to improved material conveyance. This can sometimes be undesirable if it would build up too much pressure. In such a case, the knife set would be fixed in the stator 7. A more even grinding could also be expected under certain circumstances.
  • Fig. 3 shows the part of a grinding tool with porous abrasive grinding surfaces 5, which - as already mentioned - can either work with knife sets or, in turn, with hard-pored surfaces.
  • the roughness depth T is exaggeratedly large and indicated by arrows.
  • Fig. 5 shows a not-to-scale diagram of the degree of grinding development.
  • the abscissa 12 represents the specific work, e.g. in kWh / to and ordinate 11 the grinding development, e.g. measured in degrees Schopper Riegler. Milling between points A and B takes place in the primary grinding stage and between points B and C in the secondary grinding stage. Correspondingly, sections 13 and 14 are on the abscissa 12.
  • the grinding development according to this method is shown in curve K 1. An energetically more favorable grinding degree development can be seen than if grinding were carried out in only one step (curve K 2).

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

Abstract

A process for milling paper fibres (F) in an aqueous suspension entails mechanically stressing the fibres between opposing milling tools (3, 3', 4, 4') moving relative to each other to such an extent that their length is shortened, their surfaces extended or both. They are milled in at least two consecutive stages (1, 2), the primary milling stage (1) being implemented with milling tools (3, 3') from which at least one faces the opposing tool with a porous abrasive surface having a depth of roughness of at least 0.2 mm. In the secondary stage (2) the tools (4, 4') making contact with the fibres are milling bars or blade trimmings which work against one another.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Mahlung von Papierfasern gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for grinding paper fibers according to the preamble of claim 1.

Verfahren dieser Art werden seit langer Zeit eingesetzt, da die zur Papierherstellung benötigten Zellstoffasern erst durch eine Mahlbehandlung die gewünschten Eigenschaften erhalten. Aber auch aus Altpapier gewonnene Fasern müssen oft vor dem Wiedereinsatz gemahlen werden.Processes of this type have been used for a long time since the pulp fibers required for paper production only obtain the desired properties through a milling treatment. However, fibers made from waste paper often have to be ground before reuse.

Ein beträchtlicher Teil der Betriebskosten, die bei der Mahlung von Faserstoffen in der Zellstoff- und Papierindustrie anfallen, rührt von den Energiekosten her. Daher war es schon immer ein Bestreben, Mahlverfahren zu finden, mit denen - gemessen an dem gewünschten Erfolg - ein nicht zu hoher Energieeinsatz gebraucht wird. Da die Zielsetzungen der Faserstoffbehandlung je nach Anwendungsfall unterschiedlich sind, ist auch die Beurteilung des Mahleffektes unterschiedlich. In vielen Fällen wird die eingesetzte Energie auf den Mahlerfolg so bezogen, wobei z.B. die Mahlarbeit (kWh) entweder pro Tonne Faserstoff und Mahlgradsteigerung oder pro Tonne Faserstoff und Festigkeitssteigerung angegeben wird. Der erzielte Mahlgrad wird meist nach der Methode "Schopper Riegler" gemessen, bei der im wesentlichen die Wasseraufnahme ermittelt wird.A significant portion of the operating costs of pulp pulping in the pulp and paper industry comes from energy costs. Therefore, it has always been an effort to find grinding processes that - based on the desired success - do not require too much energy. Since the objectives of fiber treatment differ depending on the application, the evaluation of the grinding effect is also different. In many cases, the energy used is related to the grinding success, e.g. the grinding work (kWh) is given either per tonne of fiber and increase in grind or per tonne of fiber and increase in strength. The degree of grinding achieved is usually measured using the "Schopper Riegler" method, which essentially determines the water absorption.

Die zur Mahlung eingesetzten Mahlwerkzeuge werden auch Garnituren genannt und in Mahlmaschinen - sogenannte Refiner - eingebaut. Solche Mahlmaschinen haben mindestens einen Rotor und mindestens einen Stator mit entweder scheibenring- oder kegelstumpfförmigen Flächen, auf denen die Mahlwerkzeuge oder Garnituren angebracht werden, so daß sich zwischen ihnen Mahlspalten ausbilden können. Weisen Mahlwerkzeuge an den Arbeitsflächen Stege und Nuten auf, spricht man von "Messer-Garnituren". Es gibt aber auch Mahlwerkzeuge, bei denen die dem Stoffstrom zugewandten Mahlflächen eine harte porige Struktur mit einer Rauhtiefe von einem Zehntel bis etwa drei Millimetern haben. Zwischen diesen Mahlflächen sind oft noch einige Kanäle zur Stofführung frei gehalten. Die Struktur darf sich mit der Zeit nicht allzusehr ändern. Sie darf also auch mit zunehmendem Verschleiß der Garnitur nicht glatt werden.The grinding tools used for grinding are also called sets and installed in grinding machines - so-called refiners. Such grinding machines have at least one rotor and at least one stator with either disc-ring or truncated cone-shaped surfaces on which the grinding tools or fittings are attached, so that grinding gaps can form between them. Point Grinding tools on the work surfaces webs and grooves, one speaks of "knife sets". However, there are also grinding tools in which the grinding surfaces facing the material flow have a hard, porous structure with a roughness depth of one tenth to about three millimeters. Between these grinding surfaces there are often still a few channels for material guidance. The structure must not change too much over time. So it must not become smooth even with increasing wear of the clothing.

Es ist Aufgabe der Erfindung, ein neues Mahlverfahren zu schaffen, mit dem die zur Mahlung von Fasern eingesetzte Energie geringer ist als bisher. Auch sollte der Verschleiß der beim Verfahren eingesetzten Mahlwerkzeuge möglichst gering sein.It is an object of the invention to provide a new grinding process with which the energy used for grinding fibers is lower than before. The wear of the grinding tools used in the process should also be as low as possible.

Diese Aufgabe wird durch die Kennzeichen der Ansprüche 1 gelost. Die nachfolgenden Unteransprüche beschreiben besonders vorteilhafte Ausgestaltungen.This object is achieved by the characteristics of claims 1. The following subclaims describe particularly advantageous configurations.

Mit Hilfe des Verfahrens ist es möglich, die Energie optimal einzusetzen: Zu Beginn der Mahlung, wenn der Mahlgrad des Faserstoffes noch relativ niedrig ist, läßt sich durch die abrasive Wirkung der hartporigen Mahlflächen ein überrraschend schneller Mahlgradanstieg erreichen. Das gilt auch im Vergleich zu speziellen "schneidenden Garnituren", wie sie oft im initialen Bereich der Mahlung verwendet werden. Die so vorgemahlenen Fasern werden anschließend in der sekundären Mahlstufe mit Messergarnituren sehr wirtschaftlich auf den gewünschten Endzustand gebracht.With the help of the process it is possible to use the energy optimally: At the beginning of the grinding process, when the degree of grinding of the fibrous material is still relatively low, the abrasive effect of the hard-pored grinding surfaces enables a surprisingly rapid increase in the degree of grinding. This also applies in comparison to special "cutting sets" as they are often used in the initial area of grinding. The fibers thus pre-ground are then brought very economically to the desired final state in the secondary grinding stage with knife sets.

Für die primäre Mahlstufe ist es entscheidend, daß die genannten hartporigen Mahlflächen auf mindestens einer Seite der Mahlwerkzeuge vorhanden sind. Es gibt die Möglichkeit, derartige Mahlflächen auch gegen konventionelle Messergarnituren arbeiten zu lassen. Die sich zwischen den Messerleisten befindenden Kanäle können in einem solchen Fall für einen ausreichenden Transport der zu mahlenden Faserstoffsuspension sorgen, z.B. auch ohne, daß an der porösen Mahlfläche Kanäle erforderlich sind. Dann findet infolge des den Messerleisten gegenüberliegenden hartporigen Mahlwerkzeugs die besonders günstige abrasive Mahlbehandlung statt. Der Stofftransport in der Mahlmaschine wird verstärkt, wenn die Messergarnitur einer solchen Kombination am Rotor befestigt ist. Bei der Vielzahl möglicher Anforderungen an die Mahlentwicklung bleibt es dem Fachmann überlassen, in welcher Weise er relativ zueinander bewegte Mahlwerkzeuge ausgestaltet unter Beachtung der in den Ansprüchen genannten Kennzeichen.For the primary grinding stage, it is crucial that the hard-pored grinding surfaces mentioned are present on at least one side of the grinding tools. It is possible to have grinding surfaces of this type work against conventional knife sets. In such a case, the channels located between the knife bars can ensure sufficient transport of the pulp suspension to be ground, for example also without channels being required on the porous grinding surface. Then, due to the hard-pore grinding tool opposite the knife bars, the particularly favorable abrasive grinding treatment takes place. Of the Mass transfer in the grinding machine is increased if the knife set of such a combination is attached to the rotor. Given the large number of possible requirements for grinding development, it is up to the person skilled in the art to design grinding tools that move relative to one another, taking into account the characteristics specified in the claims.

Bei der Durchführung des Verfahrens können je nach Anlagengröße mehrere Mahlmaschinen derart verwendet werden, daß für jede Mahlstufe wenigstens eine Maschine zur Verfügung steht. Dadurch läßt sich jede Mahlstufe leistungsmäßig separat regeln, also der speziellen Mahlaufgabe dieser Stufe und den Eigenschaften der Mahlflächen optimal anpassen. Ferner wird die Mahlung gleichmäßiger. Darüberhinaus ist es bei dem Verfahren oft von Vorteil, wenn pro Maschine nur eine relativ geringe spezifische Mahlarbeit (kWh/to) übertragen wird.Depending on the size of the system, several grinding machines can be used in carrying out the method in such a way that at least one machine is available for each grinding stage. This means that each grinding stage can be controlled separately in terms of performance, i.e. optimally adapted to the specific grinding task of this stage and the properties of the grinding surfaces. Furthermore, the grinding becomes more uniform. In addition, it is often advantageous in the method if only a relatively low specific grinding work (kWh / to) is transferred per machine.

Es ist möglich, innerhalb einer Mahlstufe, sei es nun die primäre oder sekundäre, mehrere Refiner in Reihe oder auch parallel zu schalten.It is possible to connect several refiners in series or in parallel within a grinding stage, be it the primary or secondary.

Bei den in der sekundären Mahlstufe verwendeten Maschinen ist es von weiterem Vorteil, Garnituren mit Messern aus Keramik/Metall- Verbundwerkstoff einzusetzen, die für Fasern mit mittlerem und höherem Mahlgrad besonders gut geeignet sind. Sie haben dann auch einen extrem geringen Abrieb. Solche Garnituren mit einer Verbundstruktur und im wesentlichen glatter, nicht abrasiver Oberfläche sind z.B. aus der EP 0 575 685 A1 bekannt.In the machines used in the secondary grinding stage, it is a further advantage to use sets with knives made of ceramic / metal composite material, which are particularly well suited for fibers with medium and higher grinding degrees. You then also have extremely low abrasion. Such sets with a composite structure and an essentially smooth, non-abrasive surface are e.g. known from EP 0 575 685 A1.

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

Fig. 1
schematisch: Die Schritte des erfindungsgemäßen Verfahrens;
Fig. 2
schematisch: Eine Variation der primären Mahlstufe;
Fig. 3
schematisch: Ein hartporiges Mahlwerkzeug;
Fig. 4
schematisch: Den Teil einer Messergarnitur;
Fig. 5
schematisch: Mahlgradentwicklung/Diagramm.
The invention and its advantages are explained with reference to drawings. Show:
Fig. 1
schematically: the steps of the method according to the invention;
Fig. 2
schematic: a variation of the primary grinding stage;
Fig. 3
schematic: a hard pore grinding tool;
Fig. 4
schematic: the part of a knife set;
Fig. 5
schematic: grinding degree development / diagram.

Fig. 1 läßt die primäre Mahlstufe 1 und die ihr folgende sekundäre Mahlstufe 2 erkennen. Der Suspensionsstrom mit den Papierfasern F ist als Pfeil angegeben, der durch beide Mahlstufen verläuft. Bei dem gezeigten Beispiel handelt es sich um eine Realisierung mit Scheibenrefinern. In der primären Mahlstufe 1 werden Mahlwerkzeuge 3 und 3' verwendet, die sich relativ zueinander bewegen. Angedeutet sind ein Stator 7 und ein Rotor 8, die gegeneinander positioniert und bewegbar sind, wobei sich zwischen den auf ihnen befindlichen Mahlwerkzeugen 3 und 3' der eigentliche Mahlspalt S bildet. Bei diesem Beispiel arbeiten zwei hartporige Mahlwerkzeuge gegeneinander. Der in der primären Mahlstufe 1 vorgemahlene Faserstoff gelangt anschließend in die Sekundär-Mahlstufe 2. Diese ist mit den Mahlwerkzeugen 4 und 4' ausgestattet, jeweils als konventionelle Messergarnituren, die auf einem Stator 9 bzw. Rotor 10 befestigt sind.Fig. 1 shows the primary grinding stage 1 and the following secondary grinding stage 2. The suspension flow with the paper fibers F is indicated as an arrow, which runs through both grinding stages. The example shown is a realization with disc refiners. In the primary grinding stage 1, grinding tools 3 and 3 'are used which move relative to one another. A stator 7 and a rotor 8 are indicated, which are positioned and movable relative to one another, the actual grinding gap S being formed between the grinding tools 3 and 3 'located on them. In this example, two hard-pore grinding tools work against each other. The pulp pre-ground in the primary grinding stage 1 then passes into the secondary grinding stage 2. This is equipped with the grinding tools 4 and 4 ', in each case as conventional knife sets, which are attached to a stator 9 or rotor 10.

Die in Fig. 1 gezeigte Ausführungsform ist nur eine der denkbaren Möglichkeiten.The embodiment shown in Fig. 1 is only one of the conceivable possibilities.

In Fig. 2 ist eine Variante dargestellt, bei der die primäre Mahlstufe 1 sowohl ein hartporiges Mahlwerkzeug 3 als auch ein mit Mahlleisten 6 versehenes Mahlwerkzeug 3' aufweist. In dem hier gezeigten Fall ist die Messergarnitur am Rotor 8 befestigt, was zur verbesserten Stofförderung führt. Dies kann gelegentlich unerwünscht sein, wenn dadurch ein zu hoher Druck aufgebaut würde. In einem solchen Falle würde man die Messergarnitur im Stator 7 fixieren. Dabei wäre unter Umständen auch eine gleichmäßigere Ausmahlung zu erwarten.FIG. 2 shows a variant in which the primary grinding stage 1 has both a hard-pored grinding tool 3 and a grinding tool 3 ′ provided with grinding strips 6. In the case shown here, the knife set is attached to the rotor 8, which leads to improved material conveyance. This can sometimes be undesirable if it would build up too much pressure. In such a case, the knife set would be fixed in the stator 7. A more even grinding could also be expected under certain circumstances.

Wenn auch nicht dargestellt, da selbstverständlich, kann das Verfahren auch in an sich bekannten Kegelrefinern realisiert werden, wobei wieder eine primäre und eine sekundäre Mahlstufe gemäß den Ansprüchen zu wählen wäre.Although not shown, since it goes without saying, the method can also be implemented in cone refiners known per se, again choosing a primary and a secondary grinding stage according to the claims.

Fig. 3 zeigt den Teil eines Mahlwerkzeuges mit porigen abrasiven Mahlflächen 5, die - wie bereits ausgeführt - entweder mit Messergarnituren oder auch wiederum mit hartporigen Flächen zusammenarbeiten können. Die Rauhtiefe T ist übertrieben groß gezeichnet und durch Maßpfeile angegeben.Fig. 3 shows the part of a grinding tool with porous abrasive grinding surfaces 5, which - as already mentioned - can either work with knife sets or, in turn, with hard-pored surfaces. The roughness depth T is exaggeratedly large and indicated by arrows.

Der Vollständigkeit halber ist in Fig. 4 ein Teil einer an sich bekannten Messergarnitur mit Mahlleisten 6 dargestellt.For the sake of completeness, part of a known knife set with grinding strips 6 is shown in FIG. 4.

Fig. 5 zeigt ein nicht unbedingt maßstäbliches Diagramm zur Mahlgradentwicklung. Die Abszisse 12 stellt die spezifische Arbeit, z.B. in kWh/to dar und die Ordinate 11 die Mahlentwicklung, z.B. gemessen in Grad Schopper Riegler. Zwischen den Punkten A und B wird in der primären Mahlstufe gemahlen und zwischen den Punkten B und C in der sekundären. Entsprechend sind die Abschnitte 13 und 14 auf der Abszisse 12. Die Mahlentwicklung gemäß diesem Verfahren zeigt die Kurve K 1. Man erkennt eine energetisch günstigere Mahlgradentwicklung, als wenn nur in einer Stufe (Kurve K 2) gemahlen würde.Fig. 5 shows a not-to-scale diagram of the degree of grinding development. The abscissa 12 represents the specific work, e.g. in kWh / to and ordinate 11 the grinding development, e.g. measured in degrees Schopper Riegler. Milling between points A and B takes place in the primary grinding stage and between points B and C in the secondary grinding stage. Correspondingly, sections 13 and 14 are on the abscissa 12. The grinding development according to this method is shown in curve K 1. An energetically more favorable grinding degree development can be seen than if grinding were carried out in only one step (curve K 2).

Claims (14)

Verfahren zur Mahlung von Papierfasern (F) in wässriger Suspension, bei dem die Fasern zwischen relativ zueinander bewegten und gegeneinander positionierten Mahlwerkzeugen (3, 3', 4, 4') mechanisch so beansprucht werden, daß sich ihre Länge verringert und/oder ihre Oberfläche vergrößert,
dadurch gekennzeichnet,
daß die Papierfasern (F) nacheinander in mindestens zwei Mahlstufen (1, 2) gemahlen werden, wobei die primäre Mahlstufe (1) mit solchen Mahlwerkzeugen (3, 3') durchgeführt wird, von denen mindestens eines an einer dem Gegenwerkzeug zugewandten Seite mindestens eine porige abrasive Mahlfläche (5) mit einer Rauhtiefe von mindestens 0,2 mm aufweist und wobei in der sekundären Mahlstufe (2) Mahlwerkzeuge (4, 4') mit faserberührenden Mahlleisten (6), sogenannte Messergarnituren, gegeneinander arbeiten.Process for grinding paper fibers (F) in aqueous suspension, in which the fibers are mechanically stressed between grinding tools (3, 3 ', 4, 4') which are moved relative to one another and positioned relative to one another in such a way that their length is reduced and / or their surface enlarged,
characterized by
that the paper fibers (F) are ground successively in at least two grinding stages (1, 2), the primary grinding stage (1) being carried out with such grinding tools (3, 3 '), at least one of which has at least one on a side facing the counter-tool has porous abrasive grinding surface (5) with a roughness depth of at least 0.2 mm and in the secondary grinding stage (2) grinding tools (4, 4 ') with fiber-contacting grinding strips (6), so-called knife sets, work against each other. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Rauhtiefe (T) der in der primären Mahlstufe (1) verwendeten Mahlwerkzeuge (3, 3') mindestens 1 mm ist.Method according to claim 1,
characterized by
that the roughness (T) of the grinding tools (3, 3 ') used in the primary grinding stage (1) is at least 1 mm. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß der Korndurchmesser der porigen abrasiven Mahlfläche (5) in der primären Mahlstufe (1) mindestens 2 mm beträgt.The method of claim 1 or 2,
characterized by
that the grain diameter of the porous abrasive grinding surface (5) in the primary grinding stage (1) is at least 2 mm. Verfahren nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet,
daß die Rauhtiefe (T) mindestens 1 mm ist.The method of claim 1, 2 or 3,
characterized by
that the roughness depth (T) is at least 1 mm. Verfahren nach Anspruch 1, 2, 3 oder 4,
dadurch gekennzeichnet,
daß die in der primären Mahlstufe (1) verwendeten Mahlwerkzeuge (3, 3'), die die poröse abrasive Mahlfläche (5) haben, zumindest teilweise aus einem porösen keramisch-metallischen Verbundmaterial bestehen.The method of claim 1, 2, 3 or 4,
characterized by
that the grinding tools (3, 3 ') used in the primary grinding stage (1), which have the porous abrasive grinding surface (5), at least partially consist of a porous ceramic-metallic composite material. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß in der primären Mahlstufe (1) Mahlwerkzeuge (3, 3') mit abrasiven Flächen gegeneinander arbeiten.Method according to one of the preceding claims,
characterized by
that in the primary grinding stage (1) grinding tools (3, 3 ') work against each other with abrasive surfaces. Verfahren nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß in der primären Mahlstufe (1) Mahlwerkzeuge (3) mit abrasiven Flächen (5) gegen andere Mahlwerkzeuge (3') mit Mahlleisten (6'), sogenannte Messergarnituren, positioniert und bewegt werden.Method according to one of claims 1 to 5,
characterized by
that grinding tools (3) with abrasive surfaces (5) against other grinding tools (3 ') with grinding strips (6'), so-called knife sets, are positioned and moved in the primary grinding stage (1). Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die primäre Mahlstufe (1) bis zu einem Mahlgrad zwischen 18 bis 24 o Schopper Riegler geführt wird.Method according to one of the preceding claims,
characterized by
that the primary grinding stage (1) is carried out to a grinding degree between 18 and 24 o Schopper Riegler. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß Mahlwerkzeuge (4, 4') der sekundären Mahlstufe (2) Messergarnituren sind, deren mahlwirksamen Teile aus einem Keramikverbundmaterial mit im wesentlichen glatter Oberfläche bestehen.Method according to one of the preceding claims,
characterized by
that grinding tools (4, 4 ') of the secondary grinding stage (2) are knife sets, the grinding-effective parts of which consist of a ceramic composite material with an essentially smooth surface. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die Mahlwerkzeuge (3, 3', 4, 4') mit einstellbarer Kraft gegeneinander gedrückt werden.Method according to one of the preceding claims,
characterized by
that the grinding tools (3, 3 ', 4, 4') are pressed against each other with adjustable force. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß für die beiden Mahlstufen (1, 2) verschiedene Mahlmaschinen verwendet werden.Method according to one of the preceding claims,
characterized by
that different grinding machines are used for the two grinding stages (1, 2). Verfahren nach Anspruch 11,
dadurch gekennzeichnet,
daß die in den verschiedenen Mahlmaschinen auf die Papierfasern übertragene spezifische Arbeit unterschiedlich ist.A method according to claim 11,
characterized by
that the specific work carried out on the paper fibers in the different grinding machines is different. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß mindestens eine der beiden Mahlstufen (1, 2) in mehreren hintereinandergeschalteten Mahlmaschinen ausgeführt werden.Method according to one of the preceding claims,
characterized by
that at least one of the two grinding stages (1, 2) are carried out in several grinding machines connected in series. Verfahren nach einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet,
daß die beiden Mahlstufen (1, 2) in derselben Mahlmaschine ausgeführt werden.Method according to one of claims 1 to 10,
characterized by
that the two grinding stages (1, 2) are carried out in the same grinding machine.
EP96115697A 1995-12-16 1996-10-01 Method for milling paper fibres Expired - Lifetime EP0779391B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19547069 1995-12-16
DE19547069A DE19547069A1 (en) 1995-12-16 1995-12-16 Process for grinding paper fibers

Publications (2)

Publication Number Publication Date
EP0779391A1 true EP0779391A1 (en) 1997-06-18
EP0779391B1 EP0779391B1 (en) 2001-04-04

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ID=7780342

Family Applications (1)

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EP96115697A Expired - Lifetime EP0779391B1 (en) 1995-12-16 1996-10-01 Method for milling paper fibres

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EP (1) EP0779391B1 (en)
AT (1) ATE200322T1 (en)
CA (1) CA2192728A1 (en)
DE (2) DE19547069A1 (en)
NO (1) NO964593L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105113306A (en) * 2015-07-02 2015-12-02 浙江佳维康特种纸有限公司 High evenness high strength thin type paper pulping technology

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19808355A1 (en) * 1998-02-27 1999-09-02 Voith Sulzer Papiertech Patent Paper fiber suspension grinding operation for papermaking fibers

Citations (5)

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Publication number Priority date Publication date Assignee Title
DE2722906A1 (en) * 1977-04-19 1978-11-02 Escher Wyss Gmbh PLANT FOR STRIPPING FIBER SUSPENSIONS FOR PAPER MACHINES
US4166584A (en) * 1975-09-05 1979-09-04 Asplund Arne J A Apparatus for producing pulp from lignocellulose-containing material
WO1991002841A1 (en) * 1989-08-24 1991-03-07 Sprout-Bauer, Inc. Refining element and method of manufacturing same
AT393520B (en) * 1989-08-16 1991-11-11 Peter Mueller Ges M B H & Co K Disc or disc segment for disc mills, and process for the production of such discs or disc segments
EP0480851A1 (en) * 1990-10-11 1992-04-15 Technogenia S.A. Plate with abrasion resistant surface and method of manufacturing same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166584A (en) * 1975-09-05 1979-09-04 Asplund Arne J A Apparatus for producing pulp from lignocellulose-containing material
DE2722906A1 (en) * 1977-04-19 1978-11-02 Escher Wyss Gmbh PLANT FOR STRIPPING FIBER SUSPENSIONS FOR PAPER MACHINES
AT393520B (en) * 1989-08-16 1991-11-11 Peter Mueller Ges M B H & Co K Disc or disc segment for disc mills, and process for the production of such discs or disc segments
WO1991002841A1 (en) * 1989-08-24 1991-03-07 Sprout-Bauer, Inc. Refining element and method of manufacturing same
EP0480851A1 (en) * 1990-10-11 1992-04-15 Technogenia S.A. Plate with abrasion resistant surface and method of manufacturing same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105113306A (en) * 2015-07-02 2015-12-02 浙江佳维康特种纸有限公司 High evenness high strength thin type paper pulping technology

Also Published As

Publication number Publication date
NO964593L (en) 1997-06-17
EP0779391B1 (en) 2001-04-04
NO964593D0 (en) 1996-10-30
DE19547069A1 (en) 1997-06-19
DE59606710D1 (en) 2001-05-10
ATE200322T1 (en) 2001-04-15
CA2192728A1 (en) 1997-06-17

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