EP1104819A1 - Process for increasing the water retention value of paper pulps - Google Patents

Process for increasing the water retention value of paper pulps Download PDF

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Publication number
EP1104819A1
EP1104819A1 EP00123954A EP00123954A EP1104819A1 EP 1104819 A1 EP1104819 A1 EP 1104819A1 EP 00123954 A EP00123954 A EP 00123954A EP 00123954 A EP00123954 A EP 00123954A EP 1104819 A1 EP1104819 A1 EP 1104819A1
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EP
European Patent Office
Prior art keywords
post
kneading dispersion
paper
processing phase
kneading
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
Application number
EP00123954A
Other languages
German (de)
French (fr)
Other versions
EP1104819B1 (en
Inventor
Volker Dr. Gehr
Almut Kriebel
Volker Niggl
Hans-Ludwig Dr. Schubert
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
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Voith Paper Patent GmbH
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Publication of EP1104819A1 publication Critical patent/EP1104819A1/en
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    • 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
    • D21C9/001—Modification of pulp properties
    • D21C9/007—Modification of pulp properties by mechanical or physical means

Definitions

  • the invention relates to a method for increasing the water retention capacity of Paper pulp, in which the kneading dispersion known per se together with further measures are used to achieve this goal.
  • water retention is an important parameter of Paper pulp and initially affects the production conditions at the Making the paper on the paper machine. In addition, it also has the finished paper influences its quality and usability. Paper made from a paper pulp with higher water retention has better fluid absorption and increased absorbency.
  • the invention is therefore based on the object of creating a method by which Water retention of the paper pulp is improved.
  • Refinements of the method according to the invention provide that an additional Steam treatment of the paper fibers takes place before or during the Kneading dispersion can be carried out. The effect can still go through Chemicals are supported, e.g. another by adding ozone Improvement is possible.
  • the paper pulp S is first in given a drainage 1, in which a part of the water W1 is removed to the to achieve the required consistency of at least 20% dryness.
  • This now as Crumbly S 'present highly consistent material is then in one Heating 2, e.g. by adding steam 6, heated so that the specified temperature of over 45 ° C is reached.
  • the temperature is preferably in a range 90 ° C or above.
  • the hot material is then in the kneading dispersion 3rd treated. Chemicals 7 can be added, which have the effect of Process still improve.
  • the substance After the kneading dispersion 3, the substance enters the post-processing phase 4, which contains at least the dilution with water W2. Stacking and mixing is also - If available - part of this postprocessing phase 4. Important for the desired one The effect of the method is that the postprocessing phase 4 is relatively short, in any case not longer than 30 minutes, preferably 15 minutes. It is also convenient if in post-processing phase 4 at most a little specific work in the material is introduced, e.g. by pumps or stirring propellers. A refill or Post-defoliation would severely reduce the success of the procedure and should be avoided generally not. In the end, the substance S "can be suspended in the Machine chest 5 are given and is available for the paper machine PM.

Abstract

The process comprises de-watering the fibrous paper stock to achieve the necessary stock concentration of at least about 20 percent dry content. Heating by adding steam to achieve a temperature of 45-90 degrees C or higher. Treating by knead dispersing for at least 10s. Diluting with water, stacking and mixing. The process is carried out by de-watering the fibrous paper stock to achieve the necessary stock concentration of at least about 20 percent dry content. The crumbling stock formed is then heated by adding steam to achieve a temperature of 45-90 degreesC or even higher. The hot material is then treated by knead dispersing for at least 10s. Chemicals such as ozone gas may be added during the knead dispersing operation. After kneading the stock is supplied to post treatment stage where it is diluted with water, stacked and mixed. The post treatment stage does not last more than 30 min.

Description

Die Erfindung betrifft ein Verfahren zur Erhöhung des Wasserrückhaltevermögens von Papierfaserstoffen, bei dem die an sich bekannte Knetdispergierung zusammen mit weiteren Maßnahmen zur Erreichung dieses Zieles eingesetzt wird.The invention relates to a method for increasing the water retention capacity of Paper pulp, in which the kneading dispersion known per se together with further measures are used to achieve this goal.

Bekanntlich ist das Wasserrückhaltevermögen eine wichtige Kenngröße von Papierfaserstoffen und beeinflusst zunächst die Produktionsbedingungen bei der Herstellung des Papieres auf der Papiermaschine. Darüberhinaus hat es aber auch bei dem fertig hergestellten Papier Einfluss auf dessen Qualität und Verwendbarkeit. Papier, das aus einem Papierfaserstoff mit höherem Wasserrückhaltevermögen erzeugt wurde, hat eine bessere Flüssigkeitsaufnahme und eine erhöhte Saugfähigkeit.As is well known, water retention is an important parameter of Paper pulp and initially affects the production conditions at the Making the paper on the paper machine. In addition, it also has the finished paper influences its quality and usability. Paper made from a paper pulp with higher water retention has better fluid absorption and increased absorbency.

In dem Fachaufsatz A. Kriebel und R. Sigl "Beeinflussung von Fasereigenschaften durch Scheiben-Disperger und Knet-Disperger" in Wochenblatt für Papierfabrikation 23/24 1998 wird die Wirkung von Knetdispergern unter verschiedenen Bedingungen und bei verschiedenen Ausgangsstoffen ausführlich beschrieben und erläutert. Dabei wird auch ausgeführt, dass die erhöhte Porosität die Folge einer durch Knetdispergierung erzeugten Kräuselung sein kann. Bei Durchführung der dort vorgeschlagenen Verfahren ist offenbar keine Verbesserung des Wasserrückhaltevermögens erzielbar, im Gegenteil es wird auf einen geringeren Entwässerungswiderstand als Folge dieser Behandlung hingewiesen.In the technical article A. Kriebel and R. Sigl "Influencing fiber properties by Disc Disperger and Kneading Disperger "in weekly paper 23/24 1998 the effect of kneading dispersers under different conditions and at various starting materials described and explained in detail. It will also stated that the increased porosity is a result of kneading generated ripple can be. When performing the procedures proposed there apparently no improvement in water retention can be achieved, on the contrary there is less drainage resistance as a result of this treatment pointed out.

Der Erfindung liegt also die Aufgabe zu Grunde, ein Verfahren zu schaffen, mit dem das Wasserrückhaltevermögen der Papierfaserstoffe verbessert wird.The invention is therefore based on the object of creating a method by which Water retention of the paper pulp is improved.

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

Bei Kombination einer Knetdispergierung bei relativ hohen Temperaturen und der nachfolgend relativ kurzen Nachbearbeitungsphase sind bessere Wasserrückhaltungswerte erzielbar, als bisher im Stand der Technik bekannt. Der gewünschte Effekt kann mit dem neuen Verfahren sogar unter Absenkung des Mahlgrades oder zumindest ohne seine Erhöhung erzielt werden.When combining a kneading dispersion at relatively high temperatures and subsequent relatively short postprocessing phases are better Water retention values achievable than previously known in the prior art. The With the new process, the desired effect can even be achieved by reducing the degree of grinding or at least be achieved without increasing it.

Ausgestaltungen des erfindungsgemäßen Verfahrens sehen vor, dass eine zusätzliche Dampfbehandlung der Papierfasern erfolgt, welche vor oder während der Knetdispergierung durchgeführt werden kann. Die Wirkung kann noch durch Chemikalien unterstützt werden, wobei z.B. durch Zugabe von Ozon eine weitere Verbesserung möglich ist.Refinements of the method according to the invention provide that an additional Steam treatment of the paper fibers takes place before or during the Kneading dispersion can be carried out. The effect can still go through Chemicals are supported, e.g. another by adding ozone Improvement is possible.

Die Erfindung und ihre Vorteile werden erläutert an Hand einer einzigen Zeichnung. Diese zeigt als vereinfachtes Schema die bei der Durchführung des Verfahrens wichtigsten Teilschritte. Gemäß diesem Schema wird der Papierfaserstoff S zunächst in eine Entwässerung 1 gegeben, bei der ein Teil des Wassers W1 entfernt wird, um die benötigte Stoffdichte von mindestens 20 % Trockengehalt zu erreichen. Dieses nun als Krümelstoff S' vorliegende hochkonsistente Material wird anschließend in einer Aufheizung 2, z.B. durch Zugabe von Dampf 6, erhitzt, so dass die angebene Temperatur von über 45° C erreicht wird. Vorzugsweise liegt die Temperatur in einem Bereich um 90° C oder darüber. Der heiße Stoff wird anschließend in der Knetdispergierung 3 behandelt. Dabei können Chemikalien 7 zugegeben werden, die die Wirkung des Verfahrens noch verbessern. Die Zugabe von Dampf und/oder Chemikalien kann wahlweise vor dem oder im Knetdisperger erfolgen. In dem zur Knetdispergierung verwendeten Knetdisperger werden, wie an sich bekannt, Bearbeitungswerkzeuge in einem Abstand relativ zueinander bewegt, wobei der Abstand in der Regel mehrere Millimeter beträgt und die maximale Relativgeschwindigkeit unter 15 m/sec liegt.The invention and its advantages are explained with reference to a single drawing. As a simplified diagram, this shows that when the method is carried out most important sub-steps. According to this scheme, the paper pulp S is first in given a drainage 1, in which a part of the water W1 is removed to the to achieve the required consistency of at least 20% dryness. This now as Crumbly S 'present highly consistent material is then in one Heating 2, e.g. by adding steam 6, heated so that the specified temperature of over 45 ° C is reached. The temperature is preferably in a range 90 ° C or above. The hot material is then in the kneading dispersion 3rd treated. Chemicals 7 can be added, which have the effect of Process still improve. The addition of steam and / or chemicals can optionally before or in the kneading disperger. In the for kneading dispersion Kneading disperger used, as known per se, processing tools in a distance moved relative to each other, the distance usually several Is millimeters and the maximum relative speed is less than 15 m / sec.

Nach der Knetdispergierung 3 gelangt der Stoff in die Nachbearbeitungsphase 4, die zumindest die Verdünnung mit Wasser W2 beinhaltet. Auch das Stapeln und Mischen ist - falls vorhanden - Teil dieser Nachbearbeitungsphase 4. Wichtig für die gewünschte Wirkung des Verfahrens ist, dass die Nachbearbeitungsphase 4 relativ kurz ist, jedenfalls nicht länger als 30 min, vorzugsweise 15 min. Es ist auch günstig, wenn in der Nachbearbeitungsphase 4 höchstens eine geringe spezifische Arbeit in den Stoff eingebracht wird, z.B. durch Pumpen oder Rührpropeller. Eine Nachmahlung oder Nachentstippung würde den Erfolg des Verfahrens stark schmälern und sollte im allgemeinen unterlassen werden. Am Ende kann der Stoff S" als Suspension in die Maschinenbütte 5 gegeben werden und ist für die Papiermaschine PM abrufbar.After the kneading dispersion 3, the substance enters the post-processing phase 4, which contains at least the dilution with water W2. Stacking and mixing is also - If available - part of this postprocessing phase 4. Important for the desired one The effect of the method is that the postprocessing phase 4 is relatively short, in any case not longer than 30 minutes, preferably 15 minutes. It is also convenient if in post-processing phase 4 at most a little specific work in the material is introduced, e.g. by pumps or stirring propellers. A refill or Post-defoliation would severely reduce the success of the procedure and should be avoided generally not. In the end, the substance S "can be suspended in the Machine chest 5 are given and is available for the paper machine PM.

Claims (12)

Verfahren zur Erhöhung des Wasserrückhaltevermögens von Papierfaserstoffen bei dem der Papierfaserstoff mit einer Stoffdichte von mindestens 20 % und bei einer Temperatur über 45° C durch Knetdispergierung (3) bearbeitet wird, wobei die Bearbeitungszeit in der Knetdispergierung (3) mindestens 10 sec beträgt und bei dem die der Knetdispergierung (3) folgende Nachbearbeitungsphase (4) bis zur Maschinenbütte (5) der Papiermaschine (PM) in einer Verweilzeit von nicht länger als 30 min abgeschlossen wird.Process for increasing the water retention of paper pulp in which the paper pulp with a consistency of at least 20% and at a temperature above 45 ° C is processed by kneading dispersion (3), the processing time in the kneading dispersion (3) at least 10 sec and in which the following the kneading dispersion (3) Post-processing phase (4) to the machine chest (5) of the paper machine (PM) is completed in a dwell time of no longer than 30 min. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die Knetdispergierung (3) bei einer Stofftemperatur über 90° C durchgeführt wird.Method according to claim 1,
characterized by
that the kneading dispersion (3) is carried out at a material temperature above 90 ° C. Verfahren nach Anspruch 2,
dadurch gekennzeichnet,
dass die Knetdispergierung (3) bei einer Stofftemperatur über 110° C durchgeführt wird.Method according to claim 2,
characterized by
that the kneading dispersion (3) is carried out at a material temperature above 110 ° C. Verfahren nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet,
dass die in der Nachbearbeitungsphase (4) insgesamt übertragene spezifische Arbeit nicht größer ist als 10 kWh/to.The method of claim 1, 2 or 3,
characterized by
that the total specific work transferred in the postprocessing phase (4) is not greater than 10 kWh / to. Verfahren nach Anspruch 4,
dadurch gekennzeichnet,
dass die in der Nachbearbeitungsphase (4) insgesamt übertragene spezifische Arbeit nicht größer ist als 5 kWh/to. Method according to claim 4,
characterized by
that the total specific work transferred in the post-processing phase (4) is not greater than 5 kWh / to. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
dass die Temperatur des Stoffes in der Nachbearbeitungsphase (4) nicht höher als 70° C eingestellt wird.Method according to one of the preceding claims,
characterized by
that the temperature of the fabric in the post-processing phase (4) is not set higher than 70 ° C. Verfahren nach Anspruch 6,
dadurch gekennzeichnet,
dass die Temperatur des Stoffes in der Nachbearbeitungsphase (4) nicht höher als 50° C eingestellt wird.Method according to claim 6,
characterized by
that the temperature of the fabric in the post-processing phase (4) is not set higher than 50 ° C. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
dass die Verweilzeit des Stoffes in der Nachbearbeitungsphase (4) höchstens 8 min beträgt.Method according to one of the preceding claims,
characterized by
that the residence time of the substance in the post-processing phase (4) is a maximum of 8 min. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
dass in der Nachbearbeitungsphase (4) keine Maschinen zur Mahlung der Papierfasern verwendet werden.Method according to one of the preceding claims,
characterized,
that no machines for grinding the paper fibers are used in the post-processing phase (4). Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
dass vor oder während der Knetdispergierung (3) eine Dampfbehandlung des Papierstoffes erfolgt.Method according to one of the preceding claims,
characterized by
steam treatment of the paper stock takes place before or during the kneading dispersion (3). Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
dass vor oder während der Knetdispergierung (3) dem Papierfaserstoff Chemikalien (7) zugeführt werden.Method according to one of the preceding claims,
characterized by
that chemicals (7) are added to the paper pulp before or during the kneading dispersion (3). Verfahren nach Anspruch 11,
dadurch gekennzeichnet,
dass die zugeführten Chemikalien (7) Ozongas enthalten.A method according to claim 11,
characterized by
that the chemicals supplied (7) contain ozone gas.
EP00123954A 1999-12-03 2000-11-03 Process for increasing the water retention value of paper pulps Expired - Lifetime EP1104819B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19958038 1999-12-03
DE19958038A DE19958038A1 (en) 1999-12-03 1999-12-03 Process for increasing the water retention of paper pulp

Publications (2)

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EP1104819A1 true EP1104819A1 (en) 2001-06-06
EP1104819B1 EP1104819B1 (en) 2003-04-02

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US (1) US6432263B2 (en)
EP (1) EP1104819B1 (en)
AT (1) ATE236289T1 (en)
DE (2) DE19958038A1 (en)
ES (1) ES2195830T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030219613A1 (en) * 2002-05-24 2003-11-27 Air Products Polymers, L.P., A Limited Partnership Waterborne hydrophobic barrier coatings

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59125995A (en) * 1982-08-16 1984-07-20 ダイセル化学工業株式会社 Production of cellulose having high water holdability
US4909900A (en) * 1986-03-04 1990-03-20 Sulzer-Escher Wyss Gmbh Method for high temperature, high consistency quick bleaching of raw paper pulp

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19614947B4 (en) * 1996-04-16 2004-04-08 Voith Paper Fiber Systems Gmbh & Co. Kg Process for increasing the whiteness of paper pulp

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59125995A (en) * 1982-08-16 1984-07-20 ダイセル化学工業株式会社 Production of cellulose having high water holdability
US4909900A (en) * 1986-03-04 1990-03-20 Sulzer-Escher Wyss Gmbh Method for high temperature, high consistency quick bleaching of raw paper pulp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 198435, Derwent World Patents Index; Class F09, AN 1984-216209, XP002160636 *

Also Published As

Publication number Publication date
ES2195830T3 (en) 2003-12-16
ATE236289T1 (en) 2003-04-15
US20010002616A1 (en) 2001-06-07
DE50001600D1 (en) 2003-05-08
EP1104819B1 (en) 2003-04-02
DE19958038A1 (en) 2001-06-07
US6432263B2 (en) 2002-08-13

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