EP1239074B1 - Process for producing satinated paper - Google Patents

Process for producing satinated paper Download PDF

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Publication number
EP1239074B1
EP1239074B1 EP01105754A EP01105754A EP1239074B1 EP 1239074 B1 EP1239074 B1 EP 1239074B1 EP 01105754 A EP01105754 A EP 01105754A EP 01105754 A EP01105754 A EP 01105754A EP 1239074 B1 EP1239074 B1 EP 1239074B1
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EP
European Patent Office
Prior art keywords
grinding
paper
web
pulp
grinding operation
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EP01105754A
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German (de)
French (fr)
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EP1239074A1 (en
Inventor
Thomas Jocham
Ralph Rundel
Harald Selder
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Priority to AT01105754T priority Critical patent/ATE303467T1/en
Priority to EP01105754A priority patent/EP1239074B1/en
Priority to DE50107277T priority patent/DE50107277D1/en
Publication of EP1239074A1 publication Critical patent/EP1239074A1/en
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21DTREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20Methods of refining
    • D21D1/30Disc mills
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21BFIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00Fibrous raw materials or their mechanical treatment
    • D21B1/04Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/06Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21DTREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20Methods of refining
    • D21D1/30Disc mills
    • D21D1/306Discs
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00Calenders; Smoothing apparatus
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14Secondary fibres

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • US 5,914,008 shows a method for smoothing paper material in which the Smoothness can be improved by placing certain moisture values in the paper web be set or respected.
  • DE-A-195 48 865 deals with a special paper smoothing process. Serves a calender with a heated Central roller to which several counter rollers are pressed with adjustable forces.
  • a paper web is interposed smoothed several rollers, e.g. the lower roller one Deflection compensation roller with zone-adjustable pressures.
  • the generated Smoothness is measured online and this reading, e.g. to adjust the Surface temperature used at least on one of the rollers. This should be the Smoothness to reach a given value.
  • the old papers which for wood-containing graphic papers are used, usually represent a mixture Wood pulp fibers and pulp fibers, wherein the pulp fibers in turn a Mixture of softwood and hardwood fibers.
  • Each of these three mentioned Fiber groups have a typical fiber length and fiber thickness distribution pattern. Pulp fibers generally have a relatively narrow thickness distribution spectrum, By contrast, wood pulp fibers are a very broad one. This may be the thicker share of Wood pulp fibers because of the relatively small paper thickness of the varieties considered here when satin effect quite disturbing.
  • Fig. 1 are mainly the three process sections, namely Stock preparation 1, papermaking 2 and calendering process 3, shown. It It is understood that at least the first two process sections from a Assemble variety of process steps. For example, e.g. for paper formation in the Usually at least one headbox with wet end, a subsequent Press section and a dryer section required. This process section closes usually the entire paper machine.
  • the subsequent calendering process 3 may be part of the paper machine, but may also be in a separate device be executed. As is known, calenders or supercalenders are suitable for this purpose. Its graphic representation is not required because such Paper smoothers have long been known. The finished and smoothed paper is then wound into a roll 4.
  • this section of the method also comprises a grinding 5 contains the paper fibers. Such a grinding will not be at all Waste paper processing plants carried out.
  • FIG. 2 If such a refiner 6 is shown schematically.
  • the fibrous suspension to be ground S ' is introduced centrally and then passes into the grinding zone, which through each other Moving Mahlgarnituren 9 or 9 'is formed.
  • the refiner 6 shown here is a Double-disc refiner, i. an axially floating rotor 7 is located between the two stators 8 and 10.
  • the stator 10 by a Loading device 11 axially against the rotor 7 pressed.
  • the generated by the drive 12 and transmitted in the refiner 6 on the pulp Power set After grinding, the milled pulp suspension S " radially out.
  • Fig. 2 also shows a possible favorable control concept in the implementation of the inventive method.
  • This is - as usual - the flow of the Pulp suspension S 'by a control device 20 only indicated here both in terms of consistency, as well as in terms of throughput kept constant.
  • the power of the drive 12 is determined and this value via the control line 15th a controller 13 transmitted (this could belong to a process computer). from that a control signal is formed, which via the control line 16 the Loading device 11 reached.
  • FIG. 2 is a schematic of the determination of the roughness or smoothness of the finished formed and satin paper web 19 using a scanner 18 (scanner) shown.
  • the detected signal is sent via the signal line 14 to the already mentioned controller 13 fed. If this measured value deviates from the nominal value 26, the controller 13 will produce a Change in the intensity of the grinding triggered. This can usually happen in that the loading device 11 generates a modified grinding pressure and thereby the recorded power changed or else by the drive 12 at the same Mahldruck a change in the speed is made. The latter case is more expensive in terms of apparatus, but offers the possibility of the secondary grinding edge length, e.g. measured in km / s, to change. Then can at the same grinding performance by Speed reduction, the secondary edge load, e.g. measured in Ws / km, increased become. That is, the characteristics of the grinding can be adapted to the requirements without adapting the specific work to the same extent, ie proportionally change.
  • Fig. 3 is a plan view of a Rotor 7 with the set 9 mounted thereon, which has a plurality of knives. The pure proportions are not drawn to scale, it comes up this representation on the angle the knives have to the radius.
  • the Set 9 ' which belongs to the stator, only a few knives are drawn. In this way can be seen the intersection angle ⁇ , in which the mutually moving knife are employed to each other. Knife sets whose cutting angle is relatively small, preferably about 15%, are particularly suitable for carrying out the method. This is probably due to the particularly strong fiber cutting effect and thus Fine matter formation, without causing the fibers are strongly fibrilated.
  • the abscissa 22 indicates the smoothness achieved in the calendering process plotted, while in the ordinate 21 of the occurring black satin effect is shown.
  • the smoothness of the Paper surface higher.
  • This diagram shows qualitatively which assignment is at different conditions in the previously carried out grinding.
  • the curve 25 shows the behavior of a substance with relatively high secondary Edge loading, e.g. 2000 Ws / km was milled, the curve 24 an average, e.g. 1000Ws / km and the third curve - 23 - the conditions at relatively low Intensity by the secondary edge load of 500 Ws / km.
  • the smoothness of a certain target value 26 it follows that ever after grinding process different disturbances in the form of black satin result.
  • the curve 25 has the best behavior.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

To produce a super-calendered paper, the pulp (S) is prepared (1) for a papermaking machine (2) to deliver a dry web for a polishing press (3) which polishes the web surfaces between surfaces which are pressed together. At the pulp preparation stage, the fiber suspension is processed at a grinder (5) to give the pulp a consistency of 2-8% and preferably 3-5%. The grinding intensity is set to give the required pulp character for subsequent web polishing, and is increased if the surface polishing is insufficient. To produce a polished super-calendered paper web, the pulp grinding intensity is adjusted by its specific grindability or the every second grinding edge lengths without altering the proportional specific grindability so that it remains constant. The grinding action takes place in a refiner, and the every second grinding edge length variation is set by altering the rotary speed. The blade clothing in the refiner is at a cutting angle of maximum 15 degrees . During grinding, the every second edge loading is at least 1000 Ws/km or at least 2000 Ws/km. During grinding, a pure specific grindability of at least 100 kWh/t is transferred. The grinding action gives a ground degree of at least 70 degrees SR. The fiber suspension is composed of at least 80% used paper materials of used newspapers, magazines and waste office paper. The pulp preparation station has at least one ink separation and removal function. At the web polishing stage, a flat surface pressure is applied to the web of maximum 100 N/mm<2>, using a super calender. The process control uses the achieved web polish as a reference for adjustments to the pulp grinder. The surface pressures during the surface polishing are held so low, that a permissible black satinizing value is not breached, and the pulp grinding intensity is set high enough to give the required polish level. The low pressure level at the surface polishing stage ensures that the polished web has the required level of whiteness, and the pulp grinding intensity is increased until the desired web surface polish is achieved.

Description

Die Erfindung bezieht sich auf ein Verfahren gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method according to the preamble of claim 1.

Verfahren dieser Art werden verwendet, um hochwertige und glatte Papiere zu erzeugen. Bekanntlich ist bei der Papierherstellung eine Vielzahl von Parametern zu beachten, um in allen Anforderungen ein Papier mit der geforderten Qualität zu erhalten. Bei dem hier betrachteten Verfahren steht die Erzeugung einer glatten Oberfläche bei gleichzeitig guten optischen Eigenschaften im Vordergrund. Eine glatte Oberfläche wird in der Regel dadurch erzeugt, dass die Papierbahn bei einer definierten Restfeuchte und bei bestimmten Temperaturen zwischen mindestens zwei, in der Regel einer Vielzahl von Glättwalzen hindurchgeleitet wird, welche gegeneinander gedrückt werden. Dieses Verfahren ist an sich seit langem bekannt und bewährt. Es stößt allerdings dann an die Grenzen, wenn in Folge des Pressdruckes, der in den Glättwerken erforderlich ist, unerwünschte Nebenwirkungen auftreten. Insbesondere, wenn mit Sekundärfaserstoffen, z.B. in Form von alten Tageszeitungen, produziert wird, kann der zur Erreichung der geforderten Glätte benötigte Pressdruck zu hoch sein. Oft sind dann schlechte Druckeigenschaften ("Missing Dots") die Folge. Oder es tritt eine optische Beeinträchtigung in Form von Stellen mit zu geringer Opazität, auch als Schwarzsatinage bekannt, ein. In vielen Fällen leidet durch das Satinieren auch die Weiße des Papiers. Durch einen höheren Glättwerkdruck würde sich also zwar die Glätte erhöhen lassen, gleichzeitig wird aber die optische Qualität des Papieres so weit reduziert, dass besonders bei dünnen Papieren beträchtliche Nachteile in der Verwendung dieser Sorten entstehen.Methods of this type are used to produce high quality and smooth papers. It is known that in papermaking a variety of parameters must be taken into account in order to in all requirements to receive a paper with the required quality. At this considered method is the generation of a smooth surface at the same time good optical properties in the foreground. A smooth surface usually becomes generated by the fact that the paper web at a defined residual moisture and at certain temperatures between at least two, usually a variety of Smoothing rollers is passed, which are pressed against each other. This Method has long been known and proven. However, it comes then to the Limits if, as a result of the pressing pressure required in the calenders, unwanted side effects occur. Especially if with Secondary fibers, e.g. in the form of old daily newspapers, can be produced To achieve the required smoothness required pressing pressure to be too high. Often then bad printing properties ("missing dots") the result. Or it occurs an optical Impairment in the case of places with too little opacity, also as Black satin known, one. In many cases, the satin finish also suffers White of the paper. By a higher caliper pressure so although the smoothness increase, but at the same time the optical quality of the paper so far reduces that, especially with thin papers considerable disadvantages in the Use of these varieties arise.

Wie aus der DE 198 28 952 A schon bekannt ist, kann man durch ein spezielles Verfahren die Fasern so verstärken, dass sie auch einem größeren Glättwerkdruck standhalten. Jedoch hat sich dieses Verfahren wegen des erhöhten Aufwandes bisher noch nicht allgemein durchgesetzt.As is already known from DE 198 28 952 A, one can by a special Procedures to reinforce the fibers so that they also have a larger caliper pressure withstand. However, this method has so far because of the increased effort not generally enforced.

Die US 5,914,008 zeigt ein Verfahren zum Glätten von Papiermaterial, bei dem die Glätte verbessert werden kann, indem in der Papierbahn bestimmte Feuchtigkeitswerte eingestellt bzw. eingehalten werden. Auch die DE-A-195 48 865 befasst sich mit einem speziellen Papierglättverfahren. Dazu dient ein Kalander mit einer beheizten Zentralwalze, an die mehrere Gegenwalzen mit einstellbaren Kräften angepresst werden. Bei dem in der US 5,673,616 gezeigten Verfahren wird eine Papierbahn zwischen mehreren Walzen geglättet, wobei z.B. die Unterwalze eine Durchbiegungsausgleichswalze mit zonenweise einstellbaren Drücken ist. Die erzeugte Glätte wird online gemessen und dieser Messwert z.B. zur Einstellung der Oberflächentemperatur zumindest an einer der Walzen verwendet. Dadurch soll die Glätte einen vorgegebenen Wert erreichen.US 5,914,008 shows a method for smoothing paper material in which the Smoothness can be improved by placing certain moisture values in the paper web be set or respected. Also DE-A-195 48 865 deals with a special paper smoothing process. Serves a calender with a heated Central roller to which several counter rollers are pressed with adjustable forces. In the method shown in US 5,673,616 a paper web is interposed smoothed several rollers, e.g. the lower roller one Deflection compensation roller with zone-adjustable pressures. The generated Smoothness is measured online and this reading, e.g. to adjust the Surface temperature used at least on one of the rollers. This should be the Smoothness to reach a given value.

Es ist Aufgabe der Erfindung, ein Verfahren zu schaffen, mit dem es gelingt, ein Papier insbesondere aus Sekundärfasern zu erzeugen, welches sowohl eine hohe Glätte als auch gute optische Eigenschaften aufweist, ohne dass der dazu zusätzlich benötigte Aufwand wesentlich steigt. Schwarzsatinage soll möglichst verhindert werden.It is an object of the invention to provide a method that succeeds in a paper in particular to produce secondary fibers, which both a high smoothness and has good optical properties, without the additional effort required significantly increases. Black satin should be prevented as much as possible.

Diese Aufgabe wird durch die im Kennzeichen des Anspruchs 1 genannten Merkmale gelöst.This object is achieved by the features mentioned in the characterizing part of claim 1 solved.

Durch die im Anspruch 1 beschriebenen Verfahrensabschnitte gelingt es, die Stoffaufbereitung der Papierfasern optimal auf die Erfordernisse des Satinageprozesses abzustimmen. Der Aufwand bei der Satinage kann oft reduziert werden, wenn mit geringerer Flächenpressung im Glättwerk gearbeitet werden kann.By the method sections described in claim 1 succeeds, the Stock preparation of paper fibers optimally adapted to the requirements of the calendering process vote. The cost of calendering can often be reduced when using lower surface pressure in the calender can be worked.

Besondere Vorteile hat das Verfahren bei der Verwendung von Sekundärfaserstoffen, also Altpapier zur Erzeugung von hochwertigen satinierten Papieren. Die Altpapiere, die für holzhaltige grafische Papiere eingesetzt werden, stellen zumeist eine Mischung aus Holzstofffasern und Zellstofffasern dar, wobei die Zellstofffasern wiederum eine Mischung aus Nadelholz- und Laubholzfasem sein können. Jede dieser drei genannten Fasergruppen hat ein typisches Faserlängen- und Faserdicken-Verteilungsbild. Zellstofffasern haben in der Regel ein realtiv enges Dickenverteilungsspektrum, Holzstofffasern dagegen ein sehr breites. Dabei kann sich der dickere Anteil der Holzstofffasern wegen der relativ geringen Papierdicke der hier betrachteten Sorten beim Satinieren durchaus störend auswirken.Special advantages of the method in the use of secondary fibers, ie Waste paper for the production of high quality satin papers. The old papers, which for wood-containing graphic papers are used, usually represent a mixture Wood pulp fibers and pulp fibers, wherein the pulp fibers in turn a Mixture of softwood and hardwood fibers. Each of these three mentioned Fiber groups have a typical fiber length and fiber thickness distribution pattern. Pulp fibers generally have a relatively narrow thickness distribution spectrum, By contrast, wood pulp fibers are a very broad one. This may be the thicker share of Wood pulp fibers because of the relatively small paper thickness of the varieties considered here when satin effect quite disturbing.

Die Erfindung wird erläutert an Hand von Zeichnungen. Dabei zeigen:

Fig. 1
den grundsätzlichen Ablauf des Verfahrens;
Fig. 2
Skizze eines Mahlrefiners mit entsprechender Regelung;
Fig. 3
Aufsicht auf eine Mahlgarnitur;
Fig. 4
Diagramm zur Verdeutlichung des erfindungsgemäß erzielten Glätteeffektes;
Fig. 5
Diagramm zur Verdeutlichung der mahlungsbedingten Festigkeitsentwicklung.
The invention will be explained with reference to drawings. Showing:
Fig. 1
the basic procedure of the procedure;
Fig. 2
Sketch of a Mahlrefiners with appropriate regulation;
Fig. 3
Supervision of a grinding set;
Fig. 4
Diagram to illustrate the smoothness effect achieved according to the invention;
Fig. 5
Diagram illustrating the grinding-related strength development.

In der Fig. 1 sind zur Hauptsache die drei Verfahrensabschnitte, nämlich Stoffaufbereitung 1, Papierherstellung 2 und Satinageprozess 3, dargestellt. Es versteht sich, dass sich zumindest die ersten beiden Verfahrensabschnitte aus einer Vielzahl von Verfahrensschritten zusammensetzen. So ist z.B. zur Papierbildung in der Regel mindestens ein Stoffauflauf mit Nasspartie, einer sich anschließenden Pressenpartie und einer Trockenpartie erforderlich. Dieser Prozessabschnitt schließt normalerweise die gesamte Papiermaschine ein. Der sich anschließende Satinageprozess 3 kann Teil der Papiermaschine sein, kann aber auch in einer separaten Vorrichtung ausgeführt werden. Bekanntlich sind hierzu Kalander oder Superkalander geeignet. Dessen zeichnerische Darstellung ist nicht erforderlich, da solche Papier-Glättvorrichtungen seit langem bekannt sind. Das fertig bearbeitete und geglättete Papier wird dann zu einer Rolle 4 aufgewickelt.In the Fig. 1 are mainly the three process sections, namely Stock preparation 1, papermaking 2 and calendering process 3, shown. It It is understood that at least the first two process sections from a Assemble variety of process steps. For example, e.g. for paper formation in the Usually at least one headbox with wet end, a subsequent Press section and a dryer section required. This process section closes usually the entire paper machine. The subsequent calendering process 3 may be part of the paper machine, but may also be in a separate device be executed. As is known, calenders or supercalenders are suitable for this purpose. Its graphic representation is not required because such Paper smoothers have long been known. The finished and smoothed paper is then wound into a roll 4.

Bei der Aufbereitung der Altpapiere in der Stoffaufbereitung 1 finden in der Regel eine Anzahl verschiedener Verfahrensschritte statt, z.B. muss angelieferter Papierstoff P in Wasser W suspendiert, sortiert, flotiert, dispergiert und gereinigt werden. Diese Prozesse sind aber allgemein bekannt und hier nicht dargestellt. Zumeist werden noch diverse Hilfsstoffe H hinzugegeben. Wichtig für die Durchführung des erfindungsgemäßen Verfahrens ist, dass dieser Verfahrensabschnitt auch eine Mahlung 5 der Papierfasern enthält. Eine solche Mahlung wird nicht bei allen Altpapier-Aufbereitungsanlagen durchgeführt.In the processing of waste paper in stock preparation 1 usually find one Number of different process steps, e.g. must be delivered pulp P in Water W is suspended, sorted, floated, dispersed and purified. These But processes are well known and not shown here. Most are still various adjuvants H added. Important for the implementation of the The method according to the invention is that this section of the method also comprises a grinding 5 contains the paper fibers. Such a grinding will not be at all Waste paper processing plants carried out.

Besonders geeignet für die Mahlung 5 sind die an sich bekannten Mahlrefiner. In Fig. 2 ist ein solcher Refiner 6 schematisch dargestellt. Die zu mahlende Faserstoffsuspension S' wird zentral eingeführt und gelangt dann in die Mahlzone, die durch gegeneinander bewegte Mahlgarnituren 9 bzw. 9' gebildet wird. Der hier gezeigte Refiner 6 ist ein Doppelscheibenrefiner, d.h. ein axial schwimmend gelagerter Rotor 7 befindet sich zwischen den zwei Statoren 8 und 10. Dabei ist der Stator 10 durch eine Belastungseinrichtung 11 axial gegen den Rotor 7 andrückbar. Bekanntlich wird dadurch die vom Antrieb 12 erzeugte und im Refiner 6 auf den Faserstoff übertragene Leistung eingestellt. Nach der Mahlung tritt die gemahlene Faserstoffsuspension S" radial aus.Particularly suitable for grinding 5 are the known Mahlrefiner. In Fig. 2 If such a refiner 6 is shown schematically. The fibrous suspension to be ground S 'is introduced centrally and then passes into the grinding zone, which through each other Moving Mahlgarnituren 9 or 9 'is formed. The refiner 6 shown here is a Double-disc refiner, i. an axially floating rotor 7 is located between the two stators 8 and 10. Here, the stator 10 by a Loading device 11 axially against the rotor 7 pressed. As is known thereby the generated by the drive 12 and transmitted in the refiner 6 on the pulp Power set. After grinding, the milled pulp suspension S " radially out.

Die Fig. 2 zeigt auch ein mögliches günstiges Regelkonzept bei der Durchführung des erfindungsgemäßen Verfahrens. Dazu wird - wie üblich - der Stoffstrom der Faserstoffsuspension S' durch eine hier nur angedeutete Steuereinrichtung 20 sowohl bezüglich der Konsistenz, als auch bezüglich des Durchsatzes konstant gehalten. Ferner wird die Leistung des Antriebes 12 ermittelt und dieser Wert über die Steuerleitung 15 einem Regler 13 übermittelt (dieser könnte zu einem Prozessrechner gehören). Daraus wird ein Stellsignal gebildet, welches über die Steuerleitung 16 die Belastungseinrichtung 11 erreicht. So lässt sich die spezifische Arbeit, also die Mahlarbeit pro Stoffmenge, z.B. in kWh/t gemessen, einstellen. Am rechten Teil dieser Fig. 2 ist schematisch die Ermittlung der Rauhigkeit bzw. Glätte der fertig gebildeten und satinierten Papierbahn 19 mit Hilfe eines Abtasters 18 (Scanners) dargestellt. Das ermittelte Signal wird über die Signalleitung 14 dem bereits erwähnten Regler 13 zugeleitet. Weicht dieser Messwert vom Sollwert 26 ab, wird vom Regler 13 eine Änderung der Intensität der Mahlung ausgelöst. Das kann üblicherweise geschehen, indem die Belastungseinrichtung 11 einen geänderten Mahldruck erzeugt und dadurch die aufgenommene Leistung verändert oder aber auch indem im Antrieb 12 bei gleichem Mahldruck eine Veränderung der Drehzahl vorgenommen wird. Der letztgenannte Fall ist apparativ aufwendiger, bietet aber die Möglichkeit, die sekundliche Mahlkantenlänge, z.B. in km/s gemessen, zu verändern. Dann kann bei gleicher Mahlleistung durch Drehzahlsenkung die sekundliche Kantenbelastung, z.B. in Ws/km gemessen, erhöht werden. Das heißt, die Charakteristik der Mahlung lässt sich den Erfordernissen anpassen, ohne die spezifische Arbeit im gleichen Maße, also proportional, zu verändern.Fig. 2 also shows a possible favorable control concept in the implementation of the inventive method. This is - as usual - the flow of the Pulp suspension S 'by a control device 20 only indicated here both in terms of consistency, as well as in terms of throughput kept constant. Further the power of the drive 12 is determined and this value via the control line 15th a controller 13 transmitted (this could belong to a process computer). from that a control signal is formed, which via the control line 16 the Loading device 11 reached. This is how the specific work, that is the Grinding work per amount of substance, e.g. in kWh / t, adjust. On the right part of this Fig. 2 is a schematic of the determination of the roughness or smoothness of the finished formed and satin paper web 19 using a scanner 18 (scanner) shown. The The detected signal is sent via the signal line 14 to the already mentioned controller 13 fed. If this measured value deviates from the nominal value 26, the controller 13 will produce a Change in the intensity of the grinding triggered. This can usually happen in that the loading device 11 generates a modified grinding pressure and thereby the recorded power changed or else by the drive 12 at the same Mahldruck a change in the speed is made. The latter case is more expensive in terms of apparatus, but offers the possibility of the secondary grinding edge length, e.g. measured in km / s, to change. Then can at the same grinding performance by Speed reduction, the secondary edge load, e.g. measured in Ws / km, increased become. That is, the characteristics of the grinding can be adapted to the requirements without adapting the specific work to the same extent, ie proportionally change.

Der mit einem Mahlrefiner mögliche Mahlprozess wird auch von der Form der Refinermesser wesentlich beeinflusst. So zeigt z.B. die Fig. 3 die Aufsicht auf einen Rotor 7 mit der darauf befestigten Garnitur 9, die eine Vielzahl von Messern aufweist. Dabei sind die reinen Größenverhältnisse nicht maßstäblich gezeichnet, es kommt bei dieser Darstellung auf den Winkel an, den die Messer zum Radius haben. Von der Garnitur 9', die zum Stator gehört, sind nur wenige Messer gezeichnet. Auf diese Weise lässt sich der Schnittwinkel α erkennen, in dem die gegeneinander bewegten Messer zueinander angestellt sind. Messergamituren, deren Schnittwinkel relativ klein ist, vorzugsweise ca. 15 %, sind zur Durchführung des Verfahrens besonders gut geeignet. Das ist wahrscheinlich auf die besonders starke Faserschnittwirkung und damit Feinstoffbildung zurückzuführen, ohne dass dabei die Fasern stark fibriliert werden.The possible with a Mahlrefiner grinding process is also on the shape of Refiner knife significantly influenced. Thus, e.g. Fig. 3 is a plan view of a Rotor 7 with the set 9 mounted thereon, which has a plurality of knives. The pure proportions are not drawn to scale, it comes up this representation on the angle the knives have to the radius. Of the Set 9 ', which belongs to the stator, only a few knives are drawn. In this way can be seen the intersection angle α, in which the mutually moving knife are employed to each other. Knife sets whose cutting angle is relatively small, preferably about 15%, are particularly suitable for carrying out the method. This is probably due to the particularly strong fiber cutting effect and thus Fine matter formation, without causing the fibers are strongly fibrilated.

In der Fig. 4 ist über die Abszisse 22 die im Satinageprozess erreichte Glätte aufgetragen, während in der Ordinate 21 der dabei auftretende Schwarzsatinage-Effekt dargestellt ist. Grundsätzlich kann man davon ausgehen, dass die Neigung zur Schwarzsatinage mit zunehmender Flächenpressung im Kalander - um nur diesen Parameter zu nennen - zunimmt. Im Allgemeinen wird damit auch die Glätte der Papieroberfläche höher. Dieses Diagramm zeigt qualitativ, welche Zuordnung sich bei unterschiedlichen Bedingungen in der vorher durchgeführten Mahlung ergeben. Dabei zeigt die Kurve 25 das Verhalten eines Stoffes, der mit relativ hoher sekundlicher Kantenbelastung, z.B. 2000 Ws/km gemahlen wurde, die Kurve 24 einen Mittelwert, z.B. 1000Ws/km und die dritte Kurve - 23 - die Verhältnisse bei relativ geringer Intensität durch die sekundliche Kantenbelastung von 500 Ws/km. Da normalerweise für die Glätte ein bestimmter Sollwert 26 erzielt werden soll, folgt daraus, dass sich je nach Mahlverfahren unterschiedliche Störungen in Form von Schwarzsatinage ergeben. Dabei hat die Kurve 25 das beste Verhalten.In FIG. 4, the abscissa 22 indicates the smoothness achieved in the calendering process plotted, while in the ordinate 21 of the occurring black satin effect is shown. Basically one can assume that the inclination to Black satin with increasing surface pressure in the calender - just this one To name parameters - increases. In general, the smoothness of the Paper surface higher. This diagram shows qualitatively which assignment is at different conditions in the previously carried out grinding. there The curve 25 shows the behavior of a substance with relatively high secondary Edge loading, e.g. 2000 Ws / km was milled, the curve 24 an average, e.g. 1000Ws / km and the third curve - 23 - the conditions at relatively low Intensity by the secondary edge load of 500 Ws / km. As usual for the smoothness of a certain target value 26 is to be achieved, it follows that ever after grinding process different disturbances in the form of black satin result. The curve 25 has the best behavior.

Grundsätzlich können auf der Ordinate 21 auch andere durch steigende Flächenpressung nachteilig veränderte Eigenschaften aufgetragen sein. So wird z.B. oft auch die Weiße des Papiers durch den Satinageprozess reduziert. Dann wäre auf der Ordinate 21 die Weißgradreduzierung aufzutragen, die sich dadurch gering halten oder ganz verhindern lässt, dass die Fasern intensiver gemahlen werden. Basically, on the ordinate 21, others by increasing surface pressure be applied adversely changed properties. For example, often the whiteness of the Paper reduced by the calendering process. Then on the ordinate 21 would be the To apply whiteness reduction, thereby keeping low or completely prevent lets the fibers be ground more intensively.

Eines der wesentlichsten Ergebnisse des Mahlvorgangs ist die Festigkeitsentwicklung. Trägt man, wie in Fig. 5, auf der Abszisse 28 die reine spezifische Mahlarbeit auf und auf der Ordinate 21 die daraus resultierende Festigkeit des fertigen Blattes, so sieht man, dass sich grundsätzlich gemäß den dargestellten Kurven 23', 24', 25' bei unterschiedlichen Mahlparametern unterschiedliche Festigkeitsentwicklungen ergeben können. Dabei entspricht die Wahl der Parameter den entsprechenden Kurven 23, 24, 25 der Fig. 4. In vielen Fällen ist bei hoher sekundlicher Kantenbelastung, also gemäß Kurve 25', eine zwar schnellere Festigkeitsentwicklung möglich, sie kann aber im Vergleich zu den Mahlkurven 24'und 23' nicht das Festigkeitspotential des Faserstoffs voll ausnutzen. Es kann also erforderlich sein, dass bei der Festlegung der Mahlparameter ein Mindestmaß an Festigkeit, hier als Sollwert 29, berücksichtigt wird. Solche Vorgaben können bei modernen Prozessleitsystemen sehr leicht eingehalten werden.One of the most important results of the grinding process is the strength development. If you apply, as in Fig. 5, on the abscissa 28, the pure specific grinding work and on the ordinate 21 the resulting strength of the finished sheet, so sees one, that in principle according to the illustrated curves 23 ', 24', 25 'at different grinding parameters result in different strength developments can. The choice of parameters corresponds to the corresponding curves 23, 24, 25 of FIG. 4. In many cases, at high secondary edge load, ie according to Curve 25 ', although a faster strength development possible, but it can in Compared to the milling curves 24 'and 23' not the strength potential of the pulp fully exploit. It may therefore be necessary that when determining the Grinding parameters a minimum amount of strength, here as setpoint 29, taken into account becomes. Such specifications can be easily adhered to in modern process control systems become.

Claims (18)

  1. A method for producing satinated paper comprising
    a) a stock preparation stage (1) for preparing a pulp suspension (S) suitable for processing on a papermaking machine,
    b) a paper-forming section (2) in which a dried web of paper is produced from the pulp suspension, and
    c) a satination process (3), in which the web of paper is smoothed between smoothing surfaces which are pressed together and in which the smoothness achieved in the web of paper is measured,
    characterised in that
    in the stock preparation stage (1) a grinding operation (5) is carried out in which the paper fibres are present in a pulp suspension (S) with a consistency of between 2% and 8%, preferably 3 to 5%, and that the intensity of the grinding operation (5) is set corresponding to the measured value for the smoothness of the paper web produced from the ground paper fibres which is achieved in the satination process (3), by increasing the intensity if the smoothness is not adequate.
  2. A method according to Claim 1,
    characterised in that
    the intensity of the grinding operation (5) is adjusted by changing the specific grinding work.
  3. A method according to Claim 1 or 2,
    characterised in that
    the intensity of the grinding operation (5) is adjusted by changing the grinding edge length per second.
  4. A method according to Claim 3,
    characterised in that
    the grinding edge length per second is adjusted without the specific grinding work changing proportionally therewith.
  5. A method according to Claim 3,
    characterised in that
    the specific grinding work remains unchanged.
  6. A method according to Claim 4 or 5,
    characterised in that
    the grinding operation (5) takes place in a refiner, and that the grinding edge length per second is adjusted by changing the speed.
  7. A method according to one of the preceding claims,
    characterised in that
    the grinding operation (5) takes place in a refiner which is equipped with blade fittings, the cutting angle (α) of which is at most 15°.
  8. A method according to one of the preceding claims,
    characterised in that
    in the grinding operation (5) a edge load per second of at least 1000 Ws/km is set.
  9. A method according to Claim 8,
    characterised in that
    in the grinding operation (5) a edge load per second of at least 2000 Ws/km is set.
  10. A method according to one of the preceding claims,
    characterised in that
    a pure specific grinding work of at least 100 kWh/t is transmitted upon the grinding operation (5).
  11. A method according to one of the preceding claims,
    characterised in that
    a degree of grinding of at least 70° SR is achieved by means of the grinding operation (5).
  12. A method according to one of the preceding claims,
    characterised in that
    at least 80% of the pulp suspension (S) is produced from waste paper, and that the stock preparation stage (1) comprises at least one de-inking process.
  13. A method according to Claim 12,
    characterised in that
    the waste paper consists predominantly of printed waste, such as newspapers and office waste.
  14. A method according to one of the preceding claims,
    characterised in that
    a surface pressure of at most 100 N/mm2 is applied in the satination process (3).
  15. A method according to one of the preceding claims,
    characterised in that
    a supercalender is used in the satination process (3).
  16. A method according to one of the preceding claims,
    characterised in that
    in the process control the smoothness obtained in the satination process (3) is used as a regulating variable for controlling the grinding operation (5).
  17. A method according to one of the preceding claims,
    characterised in that
    the surface pressure in the satination process (3) is kept so low that a permissible calender-blackening value is not exceeded and that the intensity of the grinding operation (5) is set so high that the required smoothness is achieved.
  18. A method according to one of the preceding claims,
    characterised in that
    the surface pressure in the satination process (3) is kept so low that thereafter a required brightness is achieved and the intensity of the grinding operation (5) is set so high that the required smoothness is achieved.
EP01105754A 2001-03-08 2001-03-08 Process for producing satinated paper Expired - Lifetime EP1239074B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT01105754T ATE303467T1 (en) 2001-03-08 2001-03-08 METHOD FOR PRODUCING SATIN PAPER
EP01105754A EP1239074B1 (en) 2001-03-08 2001-03-08 Process for producing satinated paper
DE50107277T DE50107277D1 (en) 2001-03-08 2001-03-08 Method for producing satined paper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01105754A EP1239074B1 (en) 2001-03-08 2001-03-08 Process for producing satinated paper

Publications (2)

Publication Number Publication Date
EP1239074A1 EP1239074A1 (en) 2002-09-11
EP1239074B1 true EP1239074B1 (en) 2005-08-31

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EP (1) EP1239074B1 (en)
AT (1) ATE303467T1 (en)
DE (1) DE50107277D1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010180512A (en) * 2009-02-07 2010-08-19 Seed:Kk Method and system for producing pulp using waste paper-recycling apparatus, and the waste paper-recycling apparatus
US20150292158A1 (en) 2012-09-28 2015-10-15 Voith Patent Gmbh Method for controlling the formation of a fiber web of a fiber or paper producing process

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE420223B (en) * 1979-10-10 1981-09-21 Sunds Defibrator PROCEDURE AND DEVICE FOR MANUFACTURING MECHANICAL MASS
DE9320455U1 (en) * 1993-01-16 1994-08-25 V.I.B. Apparatebau Gmbh, 63477 Maintal Device for increasing the gloss and / or smoothness of a material web
DE4321061B4 (en) * 1993-06-24 2007-10-18 Voith Patent Gmbh Method and device for influencing thickness and gloss and / or smoothness in the treatment of fibrous webs
WO1996041914A1 (en) * 1995-06-12 1996-12-27 Andritz Sprout-Bauer, Inc. Low-resident, high-temperature, high-speed chip refining
DE19548865C2 (en) * 1995-12-27 2001-03-01 Kuesters Eduard Maschf calender
FI108052B (en) * 1998-04-16 2001-11-15 M Real Oyj refiner

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ATE303467T1 (en) 2005-09-15
EP1239074A1 (en) 2002-09-11

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