EP0778370A1 - Process for the addition of a reducing bleaching agent to a high consistency paper fibrous material - Google Patents
Process for the addition of a reducing bleaching agent to a high consistency paper fibrous material Download PDFInfo
- Publication number
- EP0778370A1 EP0778370A1 EP96116115A EP96116115A EP0778370A1 EP 0778370 A1 EP0778370 A1 EP 0778370A1 EP 96116115 A EP96116115 A EP 96116115A EP 96116115 A EP96116115 A EP 96116115A EP 0778370 A1 EP0778370 A1 EP 0778370A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulp
- paper pulp
- bleaching agent
- compression
- zone
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000007844 bleaching agent Substances 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title claims abstract description 11
- 239000002657 fibrous material Substances 0.000 title claims description 15
- 238000009895 reductive bleaching Methods 0.000 title claims description 4
- 230000006835 compression Effects 0.000 claims abstract description 28
- 238000007906 compression Methods 0.000 claims abstract description 28
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 20
- 239000006185 dispersion Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 abstract description 16
- 238000004061 bleaching Methods 0.000 abstract description 14
- 239000000463 material Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 2
- 239000010893 paper waste Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71775—Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
- B01F27/271—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/62—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis comprising liquid feeding, e.g. spraying means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F2025/91—Direction of flow or arrangement of feed and discharge openings
- B01F2025/912—Radial flow
- B01F2025/9121—Radial flow from the center to the circumference, i.e. centrifugal flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/57—Mixing high-viscosity liquids with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
- B01F27/271—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator
- B01F27/2711—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator provided with intermeshing elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
Definitions
- the invention relates to a method for adding reducing bleach to a high-consistency paper pulp according to the preamble of claim 1.
- bleaching processes are carried out in the treatment of paper fibers, particularly if they originate from the waste paper.
- the aim is usually to increase the degree of whiteness.
- chemicals are required, the effectiveness of which depends on certain physical parameters, e.g. Temperature, but also by the degree to which these bleaching chemicals are mixed with the paper pulp.
- the economy of the process can also be increased by the fact that the fibrous material has a higher consistency, values between 15 and 25% solids content being particularly advantageous.
- Intensive bleaching mixers are used to enable the chemicals to be mixed in with substances of the specified consistency. It has been shown that the dispersing machines, which are known per se, not only serve this purpose as a bleaching mixer, but can also increase the cleanliness of the fibrous material due to their high shear forces.
- the bleaching agents have so far been introduced into the addition device for such dispersing machines in a process of the type specified.
- the fibrous material is already pre-compressed there, but still contains a more or less large amount of air. If reducing bleaching chemicals are used, the air contained at this point can cause undesirable reactions between the atmospheric oxygen and the bleaching agent. This is particularly undesirable because it consumes bleach and then during the actual bleaching application are no longer available in the required form and quantity.
- the invention has for its object to be able to use the reducing bleaching agents used more effectively and as completely as possible for bleaching the paper pulp and thereby to improve the bleaching process.
- the bleaching chemicals are namely supplied at a point in which the substance is already compressed on the one hand, possibly also somewhat better digested, but on the other hand is sufficiently mixed with the bleaching agent during further processing within the dispersing machine.
- the chemical bleaching then runs optimally.
- a toothed-disk disperger having a rotor 5 and a stator 6 being indicated as an example of the dispersing machine 3. possibly also contain contaminants. In this highly consistent form (approx. 15-25% dry content) it is often referred to as a crumbly substance. It passes through a chute into the feed device 1 with a transport and stuffing screw 2. In the interior of this The incoming paper pulp is already pre-compressed in the feed device, which is indicated schematically by a dot area. The paper pulp S2 pre-compressed in this way then passes into the processing area 3 of the dispersing machine, in which it is compressed further to the paper pulp S3, indicated by a darker dot area.
- a bleaching agent B is added to it by a bleaching agent addition device 4, 4 '.
- the highly compressed paper pulp S3 is therefore both mechanically processed intensively and mixed with the bleach. It then emerges as fiber S4 from the housing of the dispersing machine.
- the method according to the invention can also be carried out on a kneading machine through which the fibrous material flows axially, as shown for example in FIG. 2.
- a kneading machine through which the fibrous material flows axially, as shown for example in FIG. 2.
- Such a machine which is known per se, can also be used for dispersing fibrous material, the kneading work being carried out by means of machining pins 7 which are fastened on a shaft 9 in cooperation with further pins 8 which are fastened to the inside of the housing 10.
- the pins and possibly other parts of the machine are shaped so that the material is compressed by increasingly narrow or fewer cross-sections.
- the paper pulp S1 is fed on the left with the aid of a screw, passes the processing area 3 'and leaves the dispersing machine on the right (S4).
- the method according to the invention can be used, for example by through the wall of the housing 10, the bleach is supplied at the points where the fabric is already sufficiently compressed, i.e. contains as little free air as possible.
- Fig. 3 shows somewhat more detailed, but still schematically, the structure of a toothed-disk disperger at the point at which the bleach addition device 4, 4 'is mounted.
- the housing of the dispersing machine is not shown.
- the stator 6 and the rotor 7, which are each provided with teeth 11 and 12, respectively.
- radially adjacent teeth move relative to one another while maintaining a distance that is usually only a few millimeters.
- the fiber material is intensively processed and compressed with shear forces.
- a hole 13 is expediently made on the stator side, which allows the bleaching chemicals to be fed into the material area of the dispersing machine via a connection 14.
- Fig. 4 essentially shows the device shown in Fig. 3 in another view, so that the annular arrangement of the teeth 11 and 12 is visible. The cut is made so that the teeth of both parts of the machine, i.e. the stator and the rotor, are cut. It can also be seen in the supervision that the bores 13, 13 'for the bleaching agent each end in the tooth base of a stator ring.
- the bore 13 can end not only in the base of the tooth but also at the tip and / or on its side surfaces (see FIG. 5). A distribution over the height of the tooth is also possible.
- FIG. 6 explains a particularly advantageous embodiment of the method on the basis of a dispersing machine shown in a schematic partial view.
- the Compression of the fibrous material takes place discontinuously here, ie a high compression zone 17 is first formed, which is then connected downstream to a zone in which the compression is initially lower and into which the bleaching agent B is added.
- the clothing has a back dam which serves as a barrier to the air carried along.
- a very good apparatus option for this is the attachment of a toothed ring 15 which can be rotated in the circumferential direction and which, in cooperation with the fitting part lying immediately upstream in front of it, which is also a toothed ring with teeth 12, develops an increased throttling effect.
- the throttling effect can be easily adjusted in the circumferential direction by slightly rotating the toothed ring 15, since the overlap of the teeth can thereby be changed.
- the schematically shown adjusting device 16 serves this purpose.
- discontinuity of the compression has been explained here on the basis of a special toothed ring which can be rotated in the circumferential direction, but toothless, axially displaceable rings or other adjustable throttle elements are also conceivable. In axial machines, too, continuous compression can be carried out without further ado if the teaching described is transferred accordingly.
- the high compression zone 17 is selected as the initial processing zone of the processing area, which is usually the best solution, the air originally contained, and possibly also the steam, can escape backwards to the screw conveyor 2, i.e. against the direction of transport of the highly consistent fiber S2.
- the bleaching agent B is advantageously added in the flow direction directly behind the high compression zone 17. In many cases, the fiber material can already be sufficiently dispersed after passing through the high compression zone 17. The mixing effect then predominates in the subsequent part of the processing zone 3.
- a rotatable toothed ring which resembles the toothed ring 15 at the end of the high compression zone 17, can additionally be present at the end of the clothing.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Zugabe von reduzierendem Bleichmittel zu einem Hochkonsistenz-Papierfaserstoff gemäß Oberbegriff des Anspruchs 1.The invention relates to a method for adding reducing bleach to a high-consistency paper pulp according to the preamble of
Es ist bekannt, daß bei der Aufbereitung von Papierfasern, insbesondere wenn sie aus dem Altpapier stammen, Bleichprozesse durchgeführt werden. Dabei wird zumeist eine Erhöhung des Weißgrades angestrebt. Zur Durchführung der Bleiche werden Chemikalien benötigt, deren Wirksamkeit durch bestimmte physikalische Parameter, wie z.B. Temperatur, beeinflußt werden, aber auch durch den Grad, mit dem diese Bleichchemikalien mit dem Papierfaserstoff vermischt werden. Die Ökonomie des Verfahrens läßt sich zusätzlich dadurch erhöhen, daß der Faserstoff in einer höheren Konsistenz vorliegt, wobei Werte zwischen 15 und 25 % Feststoffgehalt besonders vorteilhaft sind. Um auch die Einmischung der Chemikalien bei Stoffen der genannten Konsistenz zu ermöglichen, werden intensive Bleichmischer eingesetzt. Dabei hat es sich gezeigt, daß die an sich schon bekannten Dispergiermaschinen nicht nur diesen Zweck als Bleichmischer erfüllen, sondern auch die Sauberkeit des Faserstoffes infolge ihrer hohen Scherkräfte erhöhen können.It is known that bleaching processes are carried out in the treatment of paper fibers, particularly if they originate from the waste paper. The aim is usually to increase the degree of whiteness. In order to carry out bleaching, chemicals are required, the effectiveness of which depends on certain physical parameters, e.g. Temperature, but also by the degree to which these bleaching chemicals are mixed with the paper pulp. The economy of the process can also be increased by the fact that the fibrous material has a higher consistency, values between 15 and 25% solids content being particularly advantageous. Intensive bleaching mixers are used to enable the chemicals to be mixed in with substances of the specified consistency. It has been shown that the dispersing machines, which are known per se, not only serve this purpose as a bleaching mixer, but can also increase the cleanliness of the fibrous material due to their high shear forces.
Aus diesem Grunde werden bisher bei einem Verfahren der angegebenen Art die Bleichmittel in die Zugabevorrichtung für solche Dispergiermaschinen eingegeben. Dort ist der Faserstoff zwar schon vorverdichtet, enthält aber noch eine mehr oder weniger große Menge von Luft. Werden reduzierende Bleichchemikalien eingesetzt, können durch die an dieser Stelle enthaltene Luft unerwünschte Reaktionen zwischen dem Luftsauerstoff und dem Bleichmittel auftreten. Unerwünscht besonders deshalb, weil dadurch Bleichmittel verbraucht werden und dann bei der eigentlichen Bleichanwendung nicht mehr in der benötigten Form und Menge zur Verfügung stehen.For this reason, the bleaching agents have so far been introduced into the addition device for such dispersing machines in a process of the type specified. The fibrous material is already pre-compressed there, but still contains a more or less large amount of air. If reducing bleaching chemicals are used, the air contained at this point can cause undesirable reactions between the atmospheric oxygen and the bleaching agent. This is particularly undesirable because it consumes bleach and then during the actual bleaching application are no longer available in the required form and quantity.
Der Erfindung liegt die Aufgabe zugrunde, die eingesetzten reduzierenden Bleichmittel noch effektiver und möglichst vollständig zur Bleiche des Papierfaserstoffes einsetzen zu können und dadurch das Bleichverfahren zu verbessern.The invention has for its object to be able to use the reducing bleaching agents used more effectively and as completely as possible for bleaching the paper pulp and thereby to improve the bleaching process.
Diese Aufgabe wird durch das Kennzeichen des Anspruchs 1 vollständig gelöst.This object is completely achieved by the characterizing part of
Durch das erfindungsgemäße Verfahren werden nämlich die Bleichchemikalien an einer solchen Stelle zugeführt, in der einerseits der Stoff bereits komprimiert, eventuell auch etwas besser aufgeschlossen ist, andererseits aber noch bei der weiteren Verarbeitung innerhalb der Dispergiermaschine ausreichend mit dem Bleichmittel vermischt werden. Die chemische Bleiche läuft dann optimal ab.By means of the method according to the invention, the bleaching chemicals are namely supplied at a point in which the substance is already compressed on the one hand, possibly also somewhat better digested, but on the other hand is sufficiently mixed with the bleaching agent during further processing within the dispersing machine. The chemical bleaching then runs optimally.
Die Erfindung wird erläutert anhand von Zeichnungen. Dabei zeigen:
- Fig. 1
- die verfahrensmäßigen Abläufe am Beispiel eines Dispergers;
- Fig. 2
- eine Vorrichtung zur Durchführung des Verfahrens;
- Fig. 3
- Teil einer weiteren Vorrichtung zur Durchführung des Verfahrens;
- Fig. 4
- eine andere Ansicht der in Fig. 3 gezeigten Vorrichtung;
- Fig. 5
- Teil einer weiteren Vorrichtung zur Durchführung des Verfahrens;
- Fig. 6
- Teil einer Vorrichtung zur unstetigen Kompression.
- Fig. 1
- the procedural processes using the example of a disperser;
- Fig. 2
- a device for performing the method;
- Fig. 3
- Part of another device for performing the method;
- Fig. 4
- another view of the device shown in Fig. 3;
- Fig. 5
- Part of another device for performing the method;
- Fig. 6
- Part of a device for discontinuous compression.
Die Fig. 1 zeigt das erfindungsgemäße Verfahren schematisch, wobei als Beispiel für die Dispergiermaschine 3 ein Zahnscheibendisperger angedeutet ist, mit einem Rotor 5 und einem Stator 6. Der Papierfaserstoff S1 ist bereits entwässert und vorzerkleinert und kann neben den Papierfasern und Wasser auch weitere Begleitstoffe, evt. auch Störstoffe enthalten. In dieser hochkonsistenten Form (ca. 15-25 % Trockengehalt) wird er oft als Krümelstoff bezeichnet. Er gelangt durch einen Fallschacht in die Zuführeinrichtung 1 mit einer Transport- und Stopfschnecke 2. Im Innenraum dieser Zuführeinrichtung wird der einfallende Papierfaserstoff bereits vorverdichtet, was schematisch durch eine Punktfläche angedeutet ist. Der so vorverdichtete Papierfaserstoff S2 gelangt dann in den Bearbeitungsbereich 3 der Dispergiermaschine, in der er weiter verdichtet wird zum Papierfaserstoff S3, angedeutet durch eine dunklere Punktfläche. Dort, wo der Faserstoff als hochverdichteter Stoff S3 vorliegt, wird ihm ein Bleichmittel B durch eine Bleichmittelzugabeeinrichtung 4, 4' zugegeben. Der hochverdichtete Papierfaserstoff S3 wird daher sowohl intensiv mechanisch bearbeitet als auch mit dem Bleichmittel vermischt. Er tritt dann als Faserstoff S4 aus dem Gehäuse der Dispergiermaschine aus. Diese Vorgänge laufen so ab, daß sich die Kompressionszustände der Papierfaserstoffe S1, S2, S3, S4 stetig verändern, wobei noch eine nicht gezeigte Rückströmung von Luft auftreten kann. Die Fig. 1 kann diese komplexen Vorgänge nur grob und grundsätzlich zeigen.1 schematically shows the method according to the invention, a toothed-disk disperger having a
Das erfindungsgemäße Verfahren läßt sich auch an einer axial vom Faserstoff durchströmten Knetmaschine durchführen, wie es beispielsweise die Fig. 2 zeigt. Auch eine solche an sich bekannte Maschine kann zum Dispergieren von Faserstoff verwendet werden, wobei die Knetarbeit durch Bearbeitungszapfen 7, die auf einer Welle 9 befestigt sind, in Zusammenarbeit mit weiteren Zapfen 8, die an der Innenseite des Gehäuses 10 befestigt sind, erfolgt. Dabei sind die Zapfen und eventuell weitere Teile der Maschine so geformt, daß der Stoff durch zunehmend engere oder weniger zahlreiche Querschnitte komprimiert wird. Der Papierfaserstoff S1 wird, wie mit Pfeilen angedeutet, links mit Hilfe einer Schnecke zugeführt, passiert den Bearbeitungsbereich 3' und verläßt rechts (S4) die Dispergiermaschine. Da auch innerhalb eines solchen Axial-Kneters der Faserstoff komprimiert wird, kann das erfindungsgemäße Verfahren angewendet werden, indem z.B. durch die Wandung des Gehäuses 10 das Bleichmittel an den Stellen zugeführt wird, an denen der Stoff bereits ausreichend komprimiert ist, d.h. möglichst wenig freie Luft enthält.The method according to the invention can also be carried out on a kneading machine through which the fibrous material flows axially, as shown for example in FIG. 2. Such a machine, which is known per se, can also be used for dispersing fibrous material, the kneading work being carried out by means of machining
Fig. 3 zeigt etwas detaillierter, aber immer noch schematisch, den Aufbau eines Zahnscheibendispergers an der Stelle, an der die Bleichmittelzugabeeinrichtung 4 ,4' montiert ist. Dabei ist das Gehäuse der Dispergiermaschine nicht gezeichnet. Man erkennt den Stator 6 und den Rotor 7, welche jeweils mit Zähnen 11 bzw. 12 versehen sind. Im Betrieb bewegen sich radial benachbarte Zähne relativ zueinander unter Einhaltung eines Abstandes, der zumeist nur wenige Millimeter beträgt. In den sich dadurch bildenden Spalten wird der Faserstoff intensiv mit Scherkräften bearbeitet und komprimiert. Zweckmäßigerweise auf der Statorseite ist eine Bohrung 13 eingebracht, die über einen Anschluß 14 die Zuführung der Bleichchemikalien in den Stoffbereich der Dispergiermaschine gestattet. Da es nicht immer von vorneherein feststeht, an welcher Stelle, radial betrachtet, die Zugabe solcher Chemikalien sinnvoll ist, kann es günstig sein, radial mehrere solche Zugabestellen vorzusehen mit den Bohrungen 13,13', um den Prozeß optimieren zu können. Anzahl und Lage solcher Bleichmittelzugabeeinrichtungen hängen von den jeweiligen Erfordernissen ab. Bei einer Maschinen der hier gezeigten Art werden mehrere über den Umfang verteilte Einrichtungen sinnvoll sein, die zum Beispiel zum Stator gehören, weil dort die Anschlüsse für das Bleichmittel leicht anzubringen sind. Aber auch radial hintereinander liegende Bleichmittelzugabeeinrichtungen sind denkbar, welche entweder alternativ oder gemeinsam benutzt werden. Sehr gezielt wäre auch die Zugabe verschiedener Chemikalien in Stofflußrichtung hintereinander sehr einfach möglich.Fig. 3 shows somewhat more detailed, but still schematically, the structure of a toothed-disk disperger at the point at which the
Fig. 4 zeigt im wesentlichen die in Fig. 3 dargestellte Vorrichtung in einer anderen Ansicht, so daß die ringförmige Anordnung der Zähne 11 und 12 sichtbar wird. Der Schnitt ist so gelegt, daß die Zähne beider Teile der Maschine, also des Stators und des Rotors, geschnitten werden. Man erkennt ferner in der Aufsicht, daß die Bohrungen 13, 13' für das Bleichmittel im Zahngrund jeweils eines Statorringes enden.Fig. 4 essentially shows the device shown in Fig. 3 in another view, so that the annular arrangement of the
Es gibt noch weitere Möglichkeiten für die Zuleitung des Bleichmittels. So kann die Bohrung 13 nicht nur im Grund des Zahnes sondern auch an dessen Spitze und/oder auf seiner Seitenflächen enden (s. Figur 5). Auch eine Verteilung über die Höhe des Zahnes ist dadurch möglich.There are other ways of supplying the bleach. Thus, the
Fig. 6 erläutert anhand einer in schematischer Teilansicht gezeigten Dispergiermaschine eine besonders vorteilhafte Ausgestaltung des Verfahrens. Die Kompression des Faserstoffes erfolgt hierin unstetig, d.h. es wird zunächst eine Hochkompressionszone 17 gebildet, der sich dann stromab eine Zone anschließt, in der die Kompression zunächst geringer ist und in die das Bleichmittel B zugegeben wird. Am Ende der Hochkompressionszone 17 weist die Garnitur eine Rück-Staustufe auf, die als Sperre für die mitgeschleppte Luft dient. Eine sehr gute apparative Möglichkeit hierzu ist das Anbringen eines in Umfangsrichtung drehbaren Zahnringes 15, der in Zusammenwirkung mit dem unmittelbar stromaufwärts vor ihm liegenden Garniturteil, welcher ebenfalls ein mit Zähnen 12 besetzter Zahnring ist, eine verstärkte Drosselwirkung entwickelt. Die Drosselwirkung kann durch geringes Verdrehen des Zahnringes 15 in Umfangsrichtung leicht verstellt werden, da sich die Überdeckung der Zähne dadurch ändern läßt. Hierzu dient die schematisch gezeigte Verstellvorrichtung 16.FIG. 6 explains a particularly advantageous embodiment of the method on the basis of a dispersing machine shown in a schematic partial view. The Compression of the fibrous material takes place discontinuously here, ie a
Die Unstetigkeit der Kompression ist hier anhand eines speziellen in Umfangsrichtung verdrehbaren Zahnringes erläutert worden, es sind aber auch ungezahnte, axial verschiebbare Ringe oder sonstige einstellbare Drosselelemente denkbar. Auch in Axialmaschinen ist unstetige Kompression ohne weiteres durchführbar, wenn die beschriebene Lehre entsprechend übertragen wird.The discontinuity of the compression has been explained here on the basis of a special toothed ring which can be rotated in the circumferential direction, but toothless, axially displaceable rings or other adjustable throttle elements are also conceivable. In axial machines, too, continuous compression can be carried out without further ado if the teaching described is transferred accordingly.
Wird die Hochkompressionszone 17 als initiale Bearbeitungszone des Bearbeitungsbereiches gewählt, was in der Regel die beste Lösung ist, kann die ursprünglich enthaltene Luft, eventuell auch der Dampf, rückwärts zur Transportschnecke 2 entweichen, d.h. gegen Transportrichtung des hochkonsistenten Faserstoffes S2. In Strömungsrichtung direkt hinter der Hochkompressionszone 17 wird mit Vorteil das Bleichmittel B zugegeben. In vielen Fällen kann der Faserstoff nach dem Passieren der Hochkompressionszone 17 schon ausreichend dispergiert sein. In dem anschließenden Teil der Bearbeitungszone 3 überwiegt dann die Mischwirkung.If the
Wird der Stoff nach der Hochkompressionszone 17 weiter komprimiert, können erhöhte Drücke und damit erhöhte Temperaturen in diesem Bereich eingestellt werden. Das ergibt eine zusätzliche Verbesserung, da durch höhere Temperatur die Reaktionsgeschwindigkeit des Bleichmittels vergrößert wird, was in besonders günstigen Fällen die Möglichkeit bietet, einen nachgeschalteten Bleichturm einzusparen oder zumindest größenmäßig zu reduzieren. Um hohe Drücke in diesem Teil des Dispergerbereiches zu ermöglichen, kann ein verdrehbarer Zahnring, der dem Zahnring 15 am Ende der Hochkompressionszone 17 ähnelt, zusätzlich am Ende der Garnitur vorhanden sein.If the material is compressed further after the
Die in den Figuren dargestellten und in den Ansprüchen teilweise beschriebenen Vorrichtungen sind bei der Durchführung des erfindungsgemäßen Verfahrens nur exemplarisch genannt. Bekanntlich gibt es eine Vielzahl von Dispergiermaschinen, in denen Papierfaserstoff - sei er nun aus Altpapier oder nativem Rohstoff erzeugt - dispergiert werden kann. Sofern bei dieser Dispergierung eine Kompression des Faserstoffs erfolgt, also insbesondere die enthaltene Luft ausgetrieben wird, ist das erfindungsgemäße Verfahren anwendbar. Anzumerken ist, daß auch bei heißem Faserstoff, der selbstverständlich sehr viel Dampf enthält, immer noch genügend Luft enthalten sein kann, die das Bleichmittel chemisch angreift. Selbst dann, wenn in speziellen Fällen der hochkonsistente Faserstoff nicht von Luft, also nur von Dampf, begleitet würde, wäre das erfindungsgemäße Verfahren von Vorteil, da auch Dampf unnötig die Wirkung des Bleichmittels schon allein aufgrund seines Volumens behindern kann.The devices shown in the figures and partially described in the claims are only mentioned as examples when carrying out the method according to the invention. As is well known, there are a large number of dispersing machines in which paper pulp - be it made from waste paper or native raw material - can be dispersed. If the fibrous material is compressed during this dispersion, in particular if the air contained is expelled, the method according to the invention can be used. It should be noted that even with hot pulp, which of course contains a lot of steam, there may still be enough air to chemically attack the bleach. Even if, in special cases, the highly consistent fibrous material was not accompanied by air, that is to say only by steam, the method according to the invention would be advantageous since steam can also unnecessarily impair the action of the bleaching agent simply because of its volume.
Claims (15)
dadurch gekennzeichnet,
daß die Zugabe des Bleichmittels (B) an mehreren Stellen innerhalb des Bearbeitungsbereiches (3, 3') der Dispergiermaschine erfolgt.Process for adding reducing bleach (B) to a high-consistency paper pulp (S1, S2, S3) using a dispersing machine with a processing area (3, 3 ') in which both a compression of the pulp and a blending of the bleach (B) with the paper pulp,
characterized by
that the bleaching agent (B) is added at several points within the processing area (3, 3 ') of the dispersing machine.
dadurch gekennzeichnet,
daß der hochkonsistente Papierfaserstoff (S1, S2, S3) im Bearbeitungsbereich (3, 3') der Dispergiermaschine eine Temperatur von über 80° Celsius hat.Method according to claim 1,
characterized by
that the highly consistent paper pulp (S1, S2, S3) in the processing area (3, 3 ') of the dispersing machine has a temperature of over 80 ° Celsius.
dadurch gekennzeichnet,
daß die in der Dispergiermaschine auf den Papierfaserstoff (S1, S2, S3) übertragene spezifische Arbeit mindestens 30 KWh/to beträgt.The method of claim 1 or 2,
characterized by
that the specific work transferred to the paper pulp (S1, S2, S3) in the dispersing machine is at least 30 KWh / to.
dadurch gekennzeichnet,
daß die Kompression des Papierfaserstoffs (S1, S2, S3) innerhalb des Bearbeitungsbereiches (3, 3') einen solchen Grad erreicht, daß der Gehalt an freier Luft weniger als 1 % des Faserstoffs (Feuchtmasse) beträgt.The method of claim 1, 2 or 3,
characterized by
that the compression of the paper pulp (S1, S2, S3) within the processing area (3, 3 ') reaches such a degree that the free air content is less than 1% of the pulp (wet weight).
dadurch gekennzeichnet,
daß die Kompression des Papierfaserstoffes (S1, S2, S3) innerhalb des Bearbeitungsbereiches (3, 3') unstetig erfolgt, indem mindestens eine Hochkompressionszone (17) gebildet wird, der eine Zone von geringerer oder keiner Kompression folgt, in die das reduzierende Bleichmittel (B) eingegeben wird.Method according to one of claims 1 to 4,
characterized by
that the compression of the paper pulp (S1, S2, S3) within the Processing area (3, 3 ') is discontinuous by forming at least one high compression zone (17), which is followed by a zone of less or no compression into which the reducing bleaching agent (B) is introduced.
dadurch gekennzeichnet,
daß die Hochkompressionszone (17) im initialen Teil des Bearbeitungsbereiches (3, 3') liegt.Method according to claim 5,
characterized by
that the high compression zone (17) lies in the initial part of the processing area (3, 3 ').
dadurch gekennzeichnet,
daß der Grad der Kompression in der Hochkompressionszone (17) während des Betriebes verstellbar ist.A method according to claim 5 or 6,
characterized by
that the degree of compression in the high compression zone (17) is adjustable during operation.
dadurch gekennzeichnet,
daß sich am Ende der Hochkompressionszone (17) veränderbare offene Querschnitte befinden, durch die der hochkonsistente Faserstoff hindurchtritt.Method according to claim 7,
characterized by
that at the end of the high compression zone (17) there are changeable open cross sections through which the highly consistent fibrous material passes.
dadurch gekennzeichnet,
daß in der sich der Hochkompressionszone (17) anschließenden Zone eine Temperatur von über 100° C und ein Druck von über 1 bar herrschen.The method of claim 5, 6, 7 or 8,
characterized by
that in the zone following the high compression zone (17) there is a temperature of over 100 ° C and a pressure of over 1 bar.
dadurch gekennzeichnet,
daß am stromabwärtigen Ende des Bearbeitungsbereiches (3, 3') eine einstellbare Drosselung des Durchflusses erfolgt.Method according to one of the preceding claims,
characterized by
that an adjustable throttling of the flow takes place at the downstream end of the processing area (3, 3 ').
dadurch gekennzeichnet,
daß die Dispergiermaschine mit ringförmigen Zahngarnituren versehen ist, wobei der Papierfaserstoff radial zwischen diesen Zähnen (11, 12) hindurchgeführt wird und die Zähne in geringem Abstand voneinander mit einer Relativgeschwindigkeit von über 10 m/sec bewegt werden und daß die Zugabe des Bleichmittels (B) in Zwischenräumen zwischen den Zähnen (11, 12) mindestens einer dieser Zahngarnituren erfolgt.Method according to one of claims 1 to 10,
characterized by
that the dispersing machine is provided with ring-shaped tooth sets, the paper pulp being guided radially between these teeth (11, 12) and the teeth being moved at a small distance from one another at a relative speed of over 10 m / sec and that the addition of the bleaching agent (B) at least one of these tooth sets takes place in the spaces between the teeth (11, 12).
dadurch gekennzeichnet,
daß die Relativgeschwindigkeit mindestens 30 m/sec beträgt.A method according to claim 11,
characterized by
that the relative speed is at least 30 m / sec.
dadurch gekennzeichnet,
daß die Dispergiermaschine (3') mit einem Gehäuse (10) und mindestens einer Kneterwelle (9) versehen ist, die an ihrem Außendurchmesser Bearbeitungszapfen (7) aufweist, die relativ zu weiteren im Gehäuseinnenraum angebrachten, feststehenden Zapfen (8) bewegt werden, wobei der Papierfaserstoff (S1, S2, S3) im wesentlichen axial in dem Raum zwischen Kneterwelle (9) und Gehäusewand geführt wird und daß die Zugabe des Bleichmittels (B) in Zwischenräumen zwischen den feststehenden Zapfen (8) erfolgt.Method according to one of the preceding claims,
characterized by
that the dispersing machine (3 ') is provided with a housing (10) and at least one kneader shaft (9) which has processing pins (7) on its outer diameter, which are moved relative to other fixed pins (8) mounted in the housing interior, whereby the paper pulp (S1, S2, S3) is guided essentially axially in the space between the kneader shaft (9) and the housing wall and that the bleaching agent (B) is added in spaces between the fixed pins (8).
dadurch gekennzeichnet,
daß die Zugabe des Bleichmittels (B) an der Stelle erfolgt, an der am Papierfaserstoff bereits mindestens die Hälfte der gesamten spezifischen Dispergierarbeit verrichtet wurde.Method according to one of the preceding claims,
characterized by
that the bleaching agent (B) is added at the point where at least half of the total specific dispersion work has already been carried out on the paper pulp.
dadurch gekennzeichnet,
daß die Zugabe des Bleichmittels (B) an der Stelle erfolgt, an der am Papierfaserstoff bereits eine spezifische Dispergierarbeit von mindestens 20 KWh/to verrichtet wurde.Method according to one of the preceding claims,
characterized by
that the bleaching agent (B) is added at the point at which a specific dispersion work of at least 20 KWh / to has already been carried out on the paper pulp.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19545852A DE19545852A1 (en) | 1995-12-08 | 1995-12-08 | Process for adding reducing bleach to a high consistency paper pulp |
DE19545852 | 1995-12-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0778370A1 true EP0778370A1 (en) | 1997-06-11 |
EP0778370B1 EP0778370B1 (en) | 2002-04-17 |
Family
ID=7779570
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96116115A Expired - Lifetime EP0778370B1 (en) | 1995-12-08 | 1996-10-09 | Process for the addition of a reducing bleaching agent to a high consistency paper fibrous material |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0778370B1 (en) |
AT (1) | ATE216443T1 (en) |
DE (2) | DE19545852A1 (en) |
NO (1) | NO965179L (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009135624A2 (en) * | 2008-05-06 | 2009-11-12 | Axel Wittek | Rotor/stator system for producing dispersions |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2716926A (en) * | 1951-01-02 | 1955-09-06 | Jackson And Church Company | Apparatus for treating wood pulp |
WO1987005346A1 (en) * | 1986-03-04 | 1987-09-11 | Sulzer-Escher Wyss Gmbh | High temperature, high consistency bleaching |
WO1994027713A1 (en) * | 1993-05-24 | 1994-12-08 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Mixer, especially high-performance mixer for fine-grinding pre-ground materials |
-
1995
- 1995-12-08 DE DE19545852A patent/DE19545852A1/en not_active Ceased
-
1996
- 1996-10-09 EP EP96116115A patent/EP0778370B1/en not_active Expired - Lifetime
- 1996-10-09 AT AT96116115T patent/ATE216443T1/en not_active IP Right Cessation
- 1996-10-09 DE DE59609090T patent/DE59609090D1/en not_active Expired - Fee Related
- 1996-12-04 NO NO965179A patent/NO965179L/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2716926A (en) * | 1951-01-02 | 1955-09-06 | Jackson And Church Company | Apparatus for treating wood pulp |
WO1987005346A1 (en) * | 1986-03-04 | 1987-09-11 | Sulzer-Escher Wyss Gmbh | High temperature, high consistency bleaching |
WO1994027713A1 (en) * | 1993-05-24 | 1994-12-08 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Mixer, especially high-performance mixer for fine-grinding pre-ground materials |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009135624A2 (en) * | 2008-05-06 | 2009-11-12 | Axel Wittek | Rotor/stator system for producing dispersions |
WO2009135624A3 (en) * | 2008-05-06 | 2010-04-15 | Axel Wittek | Rotor/stator system and method for producing dispersions |
US9527048B2 (en) | 2008-05-06 | 2016-12-27 | Axel Wittek | Rotor-stator system for the production of dispersions |
Also Published As
Publication number | Publication date |
---|---|
ATE216443T1 (en) | 2002-05-15 |
DE19545852A1 (en) | 1997-06-12 |
EP0778370B1 (en) | 2002-04-17 |
DE59609090D1 (en) | 2002-05-23 |
NO965179L (en) | 1997-06-09 |
NO965179D0 (en) | 1996-12-04 |
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