EP1104819B1 - 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
EP1104819B1
EP1104819B1 EP00123954A EP00123954A EP1104819B1 EP 1104819 B1 EP1104819 B1 EP 1104819B1 EP 00123954 A EP00123954 A EP 00123954A EP 00123954 A EP00123954 A EP 00123954A EP 1104819 B1 EP1104819 B1 EP 1104819B1
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EP
European Patent Office
Prior art keywords
stock
process according
temperature
paper
finishing phase
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.)
Expired - Lifetime
Application number
EP00123954A
Other languages
German (de)
French (fr)
Other versions
EP1104819A1 (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 date
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1104819A1 publication Critical patent/EP1104819A1/en
Application granted granted Critical
Publication of EP1104819B1 publication Critical patent/EP1104819B1/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% dry matter.
  • This now as Crumbly S 'present highly consistent material is then in a 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 substance is then in the kneading 3 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 Im 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 Knetdispergem 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 dispergem under different conditions and at various starting materials described and explained in detail. It will also stated that the increased porosity is the 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.

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 post-processing 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% dry matter. This now as Crumbly S 'present highly consistent material is then in a 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 substance is then in the kneading 3 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 Im 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)

  1. Process for increasing the water retention power of paper stock, in which the paper stock is processed with a stock density of at least 20 % and at a temperature of above 45°C through kneading dispersion (3), wherein the processing time in the kneading dispersion stage (3) is at least 10 sec and in which the finishing phase (4) following the kneading dispersion (3) up to the machine chest (5) of the paper machine (PM) is concluded in a residence time of no longer than 30 min.
  2. Process according to Claim 1,
    characterised in that the kneading dispersion (3) is carried out at a stock temperature of above 90°C.
  3. Process according to Claim 2,
    characterised in that the kneading dispersion (3) is carried out at a stock temperature of above 110°C.
  4. Process according to Claim 1, 2 or 3,
    characterised in that the specific work which is transmitted overall in the finishing phase (4) does not exceed 10 kWh/t.
  5. Process according to Claim 4,
    characterised in that the specific work which is transmitted overall in the finishing phase (4) does not exceed 5 kWh/t.
  6. Process according to any one of the preceding Claims,
    characterised in that the temperature of the stock in the finishing phase (4) is set no higher than 70°C.
  7. Process according to Claim 6,
    characterised in that the temperature of the stock in the finishing phase (4) is set no higher than 50°C.
  8. Process according to any one of the preceding Claims,
    characterised in that the residence time of the stock in the finishing phase (4) is at most 8 min.
  9. Process according to any one of the preceding Claims,
    characterised in that no machines are used to beat the paper fibres in the finishing phase (4).
  10. Process according to any one of the preceding Claims,
    characterised in that the paper stock undergoes a steam treatment before or during kneading dispersion (3).
  11. Process according to any one of the preceding Claims,
    characterised in that chemicals (7) are delivered to the paper stock before or during kneading dispersion (3).
  12. Process according to Claim 11,
    characterised in that the chemicals (7) which are delivered 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 EP1104819A1 (en) 2001-06-06
EP1104819B1 true EP1104819B1 (en) 2003-04-02

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EP00123954A Expired - Lifetime EP1104819B1 (en) 1999-12-03 2000-11-03 Process for increasing the water retention value of paper pulps

Country Status (5)

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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

Family Cites Families (3)

* 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
DE3610940A1 (en) * 1986-03-04 1987-09-10 Escher Wyss Gmbh HIGH TEMPERATURE HIGH CONSISTENCY FAST WHITE
DE19614947B4 (en) * 1996-04-16 2004-04-08 Voith Paper Fiber Systems Gmbh & Co. Kg Process for increasing the whiteness of paper pulp

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
DE19958038A1 (en) 2001-06-07
EP1104819A1 (en) 2001-06-06
US6432263B2 (en) 2002-08-13

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