EP0169988A2 - Process for grading paper, and apparatus for the application of the process - Google Patents

Process for grading paper, and apparatus for the application of the process Download PDF

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Publication number
EP0169988A2
EP0169988A2 EP85105760A EP85105760A EP0169988A2 EP 0169988 A2 EP0169988 A2 EP 0169988A2 EP 85105760 A EP85105760 A EP 85105760A EP 85105760 A EP85105760 A EP 85105760A EP 0169988 A2 EP0169988 A2 EP 0169988A2
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Prior art keywords
paper web
moisture
calender
paper
drying
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EP85105760A
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German (de)
French (fr)
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EP0169988A3 (en
EP0169988B1 (en
EP0169988B2 (en
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Reinhard Dipl.-Ing. Kirbis
Janssen Reinhard
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Kammerer GmbH
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Kammerer GmbH
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Priority to AT85105760T priority Critical patent/ATE39373T1/en
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Publication of EP0169988A3 publication Critical patent/EP0169988A3/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices

Definitions

  • the invention relates to a method for finishing paper, in which a paper web is passed through at least one nip in which pressure is exerted on it and the moisture of the paper web is reduced to a final value.
  • the invention further relates to a device for performing such a method.
  • the paper web in the calender must also be dried. In many cases, therefore, the required final moisture limits the performance of the calender, i.e. the throughput speed of the paper web must be selected so that the web has the required final moisture as it exits the calender, since the drying process cannot be intensified with regard to the drying capacity of the calender.
  • the calender's performance is also limited by the thermal stability of the paper rollers.
  • the invention has for its object to provide a method of the type mentioned, with which the restrictions that were previously caused by the calender can be overcome. This object is achieved by a method having the features of claim 1.
  • the moisture content of the web at the end of the pressure treatment can be substantially above the final moisture required.
  • This makes it possible to either run the calender at a higher working speed or to use a calender with a lower number of rolls.
  • the calender capacity is increased considerably, which in many cases makes the use of one or more additional calenders unnecessary.
  • the investment costs of the additional drying device required are significantly lower than that of an additional calender, this increases the economic efficiency considerably.
  • the specific personnel costs also decrease significantly.
  • the use of a calender with a smaller number of rolls, for example a conventional supercalender drying device significantly reduces the investment costs compared to a compaction calender of the same performance, which the web leaves with the required final moisture.
  • the method according to the invention offers further essential advantages.
  • the process according to the invention allows the properties relevant to highly compressed technical papers, i.e. the density, smoothness, porosity and and the transparency-related properties, significantly improve.
  • the method according to the invention also offers advantages in connection with treatment of the paper web within a group of the paper machine, for example an inline calender or a smoothing unit.
  • the number of rollers can be reduced, which, for example, simplifies the threading of the web or achieves a higher smoothness than was previously possible, for example, with a smoothing unit, even if one takes into account that the post-drying process again slightly reduces the smoothness achieved.
  • the method according to the invention also enables the temperature of the calender rolls and / or the line pressure to be reduced to increase the service life of the paper rolls.
  • the paper web is subjected to convection drying during the drying process, since this type of post-drying is particularly space and cost-saving.
  • convection drying can also be used, for example radiation drying using infrared radiation, or contact drying, the latter being able to be carried out using heated cylinders.
  • the invention is also based on the object of providing an inexpensive device for carrying out the method according to the invention. This object is achieved by the features of claim 7.
  • the convection dryer has a plurality of pairs of nozzles which generate air currents which are directed essentially against one another along the passage of the paper web.
  • the invention is explained in detail below using an exemplary embodiment shown in the drawing.
  • the single figure shows a calender with a downstream convection dryer in a schematic view.
  • a paper web 2 with a moisture content that is between 15% and 25% is introduced into a known type of compression calender as a whole, the passage through the calender beginning in a known manner at the uppermost nip.
  • the compression calender 1 has 15 work rolls. Its metal rollers are heated with steam.
  • the adjustable line pressure is up to 500 kNm.
  • the heating of the rollers and in particular the working speed of the compression calender 1 are chosen so that the paper web leaves the calender with a dry content of about 10%.
  • the paper web 2 is introduced immediately after it leaves the compression calender 1 into a convection dryer, designated as a whole by 3, which, as shown in FIG. 1, is arranged in the exemplary embodiment directly next to the calender frame under the stage 4, on which the storage device for the Roll is located, from which the paper web 2 entering the compression calender 1 is drawn off.
  • a convection dryer designated as a whole by 3 which, as shown in FIG. 1, is arranged in the exemplary embodiment directly next to the calender frame under the stage 4, on which the storage device for the Roll is located, from which the paper web 2 entering the compression calender 1 is drawn off.
  • the convection dryer 3 contains several pairs of nozzles along the straight passage, each consisting of a nozzle 5, which is directed against the underside of the paper web 1, and a nozzle 6, which is directed against the top of the paper web. These nozzles 5 and 6 direct hot air flows against the paper web, through which the paper web is guided and its moisture content is reduced to the desired residual moisture, which is, for example, 6%. After exiting the convection dryer 3, the paper web is wound up again. It not only has the desired high compression, but also a smoothness that has never been achieved with natural paper.
  • the web 2 emerging from the convection dryer 3 is advantageously guided over a cooling cylinder, not shown, designed in a known manner. You can then fully utilize the performance of the convection dryer and thereby reduce its length to a minimum without having a too high paper temperature in the subsequent winding process.

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Abstract

1. A method of refining paper in which a paper web is passed through at least one roll gap of a calender, in which a pressure is exerted on the paper web, the moisture content thereof being reduced to a final value, characterised in that the paper web is passed out of the roll gap or the last of the roll gaps with a moisture content which is above the final value of moisture content after which, to reduce the moisture content to the final value, it is subjected to a drying process by passing through a drying apparatus.

Description

Die Erfindung betrifft ein Verfahren zum Veredeln von Papier, bei dem eine Papierbahn durch wenigstens einen Walzenspalt, in dem auf sie ein Druck ausgeübt wird, hindurchgeführt und die Feuchtigkeit der Papierbahn auf einen Endwert vermindert wird. Ferner betrifft die Erfindung eine Vorrichtung zur Durchführung eines solchen Verfahrens.The invention relates to a method for finishing paper, in which a paper web is passed through at least one nip in which pressure is exerted on it and the moisture of the paper web is reduced to a final value. The invention further relates to a device for performing such a method.

Für eine Veredelung von Papier mit dem Ziel einer Verdichtung auf ein hohes spezifisches Gewicht ist nicht nur ein hoher Liniendruck im Kalander erforderlich, sondern auch eine starke Befeuchtung der Papierbahn vor der im Kalander erfolgenden Behandlung. Da die geforderte Endfeuchte, die das Papier nach dieser Behandlung haben soll, wesentlich geringer ist als der zuvor vorhandene Feuchtigkeitsgehalt, muß die Papierbahn im Kalander auch getrocknet werden. Vielfach begrenzt deshalb die verlangte Endfeuchte die Leistungsfähigkeit des Kalanders, d.h., die Durchlaufgeschwindigkeit der Papierbahn muß so gewählt werden, daß die Bahn beim Austritt aus dem Kalander die geforderte Endfeuchte hat, da im Hinblick auf die Trocknungskapazität des Kalanders der Trockenvorgang nicht intensiviert werden kann. Außerdem ist die Leistungsfähigkeit des Kalanders durch die thermische Standfähigkeit der Papierwalzen begrenzt. Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu schaffen, mit dem die Beschränkungen, die bisher durch den Kalander bedingt waren, überwunden werden können. Diese Aufgabe löst ein Verfahren mit den Merkmalen des Anspruches 1.In order to refine paper with the aim of compressing it to a high specific weight, not only is high line pressure required in the calender, but also a strong moistening of the paper web before the treatment in the calender. Since the required final moisture content, which the paper should have after this treatment, is significantly lower than the moisture content previously present, the paper web in the calender must also be dried. In many cases, therefore, the required final moisture limits the performance of the calender, i.e. the throughput speed of the paper web must be selected so that the web has the required final moisture as it exits the calender, since the drying process cannot be intensified with regard to the drying capacity of the calender. The calender's performance is also limited by the thermal stability of the paper rollers. The invention has for its object to provide a method of the type mentioned, with which the restrictions that were previously caused by the calender can be overcome. This object is achieved by a method having the features of claim 1.

Dadurch, daß die Bahn nach dem Durchlauf durch den Kalander einem Trocknungsprozeß unterworfen wird, kann der Feuchtigkeitsgehalt der Bahn am Ende der Druckbehandlung wesentlich über der verlangten Endfeuchte liegen. Dies bietet die Möglichkeit, entweder den Kalander mit einer höheren Arbeitsgeschwindigkeit zu fahren oder einen Kalander mit einer geringeren Walzenzahl einzusetzen. Im erstgenannten Fall erreicht man eine beträchtliche Steigerung der Kalanderkapazität, was in vielen Fällen den Einsatz eines oder mehrerer zusätzlicher Kalander erübrigt. Da außerdem die Investitionskosten der erforderlichen zusätzlichen Trocknungseinrichtung wesentlich geringer sind als eines zusätzlichen Kalanders, erhöht sich hierdurch die Wirtschaftlichkeit wesentlich. Außerdem verringern sich bei einer geringeren Kalanderanzahl auch die spezifischen Personalkosten deutlich. Ebenso vermindert der Einsatz eines Kalanders mit geringerer Walzenzahl, also beispielsweise eines konventionellen Superkalanders nachgeschalteter Trocknungseinrichtung die Investitonskosten deutlich gegenüber einem Verdichtungskalander gleicher Leistungsfähigkeit, den die Bahn mit der geforderten Endfeuchte verläßt.Because the web is subjected to a drying process after it has passed through the calender, the moisture content of the web at the end of the pressure treatment can be substantially above the final moisture required. This makes it possible to either run the calender at a higher working speed or to use a calender with a lower number of rolls. In the former case, the calender capacity is increased considerably, which in many cases makes the use of one or more additional calenders unnecessary. In addition, since the investment costs of the additional drying device required are significantly lower than that of an additional calender, this increases the economic efficiency considerably. In addition, with a lower number of calenders, the specific personnel costs also decrease significantly. Likewise, the use of a calender with a smaller number of rolls, for example a conventional supercalender drying device, significantly reduces the investment costs compared to a compaction calender of the same performance, which the web leaves with the required final moisture.

Das erfindungsgemäße Verfahren bietet aber noch weitere, wesentliche Vorteile. Bei einer Behandlung der Papierbahn in einem Verdichtungskalander lassen sich durch das erfindungsgemäße Verfahren wegen der höheren Feuchte der Bahn in den letzten Walzenspalten, in denen der höchste Liniendruck herrscht, die für hochverdichtete technische Papiere relevanten Eigenschaften, also das Raumgewicht, die Glätte, die Porosität und und die Transparenz bedingten Eigenschaften, erheblich verbessern.However, the method according to the invention offers further essential advantages. When the paper web is treated in a compaction calender, the process according to the invention allows the properties relevant to highly compressed technical papers, i.e. the density, smoothness, porosity and and the transparency-related properties, significantly improve.

Bei einer Satinage von Druckpapier in einem Satinierkalander läßt sich bei gleicher Verdichtung des Papiers wegen der höheren Feuchte, bei der die Satinage beendet wird, eine wesentlich höhere Glätte der Papierbahn erzielen, als dies bei den bekannten Verfahren der Fall ist. Zwar wird die erzielte Glätte durch die Nachtrocknung etwas verringert, sie liegt jedoch auch nach der Nachtrocknung noch wesentlich über den bisher erreichten Werten für Naturpapier, so daß zumindest in einer Reihe von Anwendungsfällen das teurere, gestrichene Druckpapier durch das nach dem erfindungsgemäßen Verfahren veredelte Naturpapier ersetzt werden kann. Man kann aber auch die höhere Glättwirkung, welche mit dem erfindungsgemäßen Verfahren erreicht wird, zu einer Reduzierung des Liniendrucks nutzen, so daß bei einer gegenüber bekannten Verfahren gleichen Glätte eine deutlich geringere Verdichtung der Papierbahn während der Satinage erfolgt. Selbstverständlich lassen sich auch Zwischenwerte zwischen maximaler Glätte bei gleichbleibender Verdichtung einerseits und minimaler Verdichtung bei gleichbleibender Glätte andererseits beliebig wählen.In the case of satinizing printing paper in a calendering calender, with the same compression of the paper because of the higher moisture at which the calendering is ended, a much higher smoothness of the paper web can be achieved than is the case with the known methods. Although the smoothness achieved is somewhat reduced by post-drying, it is still significantly higher than the values previously achieved for natural paper even after post-drying, so that, at least in a number of applications, the more expensive, coated printing paper is replaced by the natural paper refined by the process according to the invention can be. However, the higher smoothing effect which is achieved with the method according to the invention can also be used to reduce the line pressure, so that with a smoothness which is the same as that of known methods, the paper web is compacted significantly less during calendering. It goes without saying that intermediate values between maximum smoothness with constant compression on the one hand and minimal compression with constant smoothness on the other hand can also be selected as desired.

Schießlich bietet das erfindungsgemäße Verfahren auch,Vorteile in Verbindung mit einer Behandlung der Papierbahn innerhalb einer Gruppe der Papiermaschine, also beispielsweise einem Inline-Kalander oder einem Glättwerk. Auch hier kann die Walzenzahl vermindert werden, wodurch beispielsweise das Aufführen der Bahn vereinfacht wird, oder aber eine höhere Glätte erreicht werden, als dies bisher beispielsweise mit einem Glättwerk möglich war, selbst wenn man berücksichtigt, daß der Nachtrocknungsprozeß die erreichte Glätte wieder etwas verringert. Schließlich ermöglicht das erfindungsgemäße Verfahren auch eine Verminderung der Temperatur der Kalanderwalzen und/-oder des Liniendrucks zur Erhöhung der Standzeit der Papierwalzen.Finally, the method according to the invention also offers advantages in connection with treatment of the paper web within a group of the paper machine, for example an inline calender or a smoothing unit. Here, too, the number of rollers can be reduced, which, for example, simplifies the threading of the web or achieves a higher smoothness than was previously possible, for example, with a smoothing unit, even if one takes into account that the post-drying process again slightly reduces the smoothness achieved. Finally, the method according to the invention also enables the temperature of the calender rolls and / or the line pressure to be reduced to increase the service life of the paper rolls.

Bei einer bevorzugten Ausführungsform wird während des Trocknungsprozesses die Papierbahn einer Konvektionstrocknung unterworfen, da diese Art der Nachtrocknung besonders raum- und kostensparend ist. Es sind aber auch andere Trocknungsarten, beispielsweise eine Strahlungstrocknung mittels Infrarotstrahlung, oder eine Kontakttrocknung verwendbar, wobei letztere mittels beheizter Zylinder durchgeführt werden kann.In a preferred embodiment, the paper web is subjected to convection drying during the drying process, since this type of post-drying is particularly space and cost-saving. However, other types of drying can also be used, for example radiation drying using infrared radiation, or contact drying, the latter being able to be carried out using heated cylinders.

Der Erfindung liegt auch die Aufgabe zugrunde, eine kostengünstige Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens zu schaffen. Diese Aufgabe ist erfindungsgemäß durch die Merkmale des Anspruches 7 gelöst.The invention is also based on the object of providing an inexpensive device for carrying out the method according to the invention. This object is achieved by the features of claim 7.

Bei einer bevorzugten Ausführungsform weist der Konvektionstrockner längs der Durchlaufstrecke der Papierbahn mehrere im wesentlichen gegeneinander gerichtete Luftströme erzeugende Düsenpaare auf.In a preferred embodiment, the convection dryer has a plurality of pairs of nozzles which generate air currents which are directed essentially against one another along the passage of the paper web.

Im folgenden ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels im einzelnen erläutert. Die einzige Figur zeigt in schematischer Ansicht einen Kalander mit nachgeordnetem Konvektionstrockner.The invention is explained in detail below using an exemplary embodiment shown in the drawing. The single figure shows a calender with a downstream convection dryer in a schematic view.

In einen als Ganzes mit 1 bezeichneten Verdichtungskalander bekannter Bauart wird eine Papierbahn 2 mit einem Feuchtigkeitsgehalt, der zwischen 15% und 25 X beträgt, eingeführt, wobei der Durchlauf durch den Kalander in bekannter Weise am obersten Walzenspalt beginnt. Der Verdichtungskalander 1 hat 15 Arbeitswalzen. Seine Metallwalzen sind mit Dampf beheizt. Der einstellbare Liniendruck beträgt bis zu 500 kNm.A paper web 2 with a moisture content that is between 15% and 25% is introduced into a known type of compression calender as a whole, the passage through the calender beginning in a known manner at the uppermost nip. The compression calender 1 has 15 work rolls. Its metal rollers are heated with steam. The adjustable line pressure is up to 500 kNm.

Die Beheizung der Walzen und insbesondere die Arbeitsgeschwindigkeit des Verdichtungskalanders 1 sind so gewählt, daß die Papierbahn den Kalander mit einem Trockengehalt von etwa 10 % verläßt.The heating of the rollers and in particular the working speed of the compression calender 1 are chosen so that the paper web leaves the calender with a dry content of about 10%.

Die Papierbahn 2 wird unmittelbar nach dem Austritt aus dem Verdichtungskalander 1 in einen als Ganzes mit 3 bezeichnetpn Konvektionstrockner eingeführt, der, wie die Figur 1 zeigt, im Ausführungsbeispiel unmittelbar neben dem Kalandergerüst unter der Bühne 4 angeordnet ist, auf dem sich die Lagerungsvorrichtung für die Rolle befindet, von der die in den Verdichtungskalander 1 einlaufende Papierbahn 2 abgezogen wird.The paper web 2 is introduced immediately after it leaves the compression calender 1 into a convection dryer, designated as a whole by 3, which, as shown in FIG. 1, is arranged in the exemplary embodiment directly next to the calender frame under the stage 4, on which the storage device for the Roll is located, from which the paper web 2 entering the compression calender 1 is drawn off.

Der Konvektionstrockner 3 enthält längs der geradlinigen Durchlaufstrecke mehrere Düsenpaare, die aus je einer Düse 5, die gegen die Unterseite der Papierbahn 1 gerichtet ist, und einer Düse 6, die gegen die Oberseite der Papierbahn gerichtet ist, bestehen. Diese Düsen 5 und 6 richten Heißluftströme gegen die Papierbahn, durch welche die Papierbahn geführt und ihr Feuchtigkeitsgehalt bis zu der gewünschten Restfeuchte vermindert wird, die beispielsweise 6 % beträgt. Nach dem Austritt aus dem Konvektionstrockner 3 wird die Papierbahn wieder aufgewickelt. Sie hat nicht nur die gewünschte hohe Verdichtung, sondern auch eine Glätte, wie sie bisher bei Naturpapier nicht erreicht werden konnte.The convection dryer 3 contains several pairs of nozzles along the straight passage, each consisting of a nozzle 5, which is directed against the underside of the paper web 1, and a nozzle 6, which is directed against the top of the paper web. These nozzles 5 and 6 direct hot air flows against the paper web, through which the paper web is guided and its moisture content is reduced to the desired residual moisture, which is, for example, 6%. After exiting the convection dryer 3, the paper web is wound up again. It not only has the desired high compression, but also a smoothness that has never been achieved with natural paper.

Die aus dem Konvektionstrockner 3 austretende Bahn 2 wird vorteilhafterweise über einen in bekannter Weise ausgebildeten, nicht dargestellten Kühlzylinder geführt. Man kann dann die Leistung des Konvektionstrockners voll ausnutzen und dadurch seine Länge auf ein Minimum reduzieren, ohne eine zu hohe Papiertemperatur beim nachfolgenden Aufwickelvorgang zu haben.The web 2 emerging from the convection dryer 3 is advantageously guided over a cooling cylinder, not shown, designed in a known manner. You can then fully utilize the performance of the convection dryer and thereby reduce its length to a minimum without having a too high paper temperature in the subsequent winding process.

Alle in der vorstehenden Beschreibung erwähnten sowie auch die nur allein aus der Zeichnung entnehmbaren Merkmale sind als weitere Ausgestaltungen Bestandteile der Erfindung, auch wenn sie nicht besonders hervorgehoben und insbesondere nicht in den Ansprüchen erwähnt sind.All of the features mentioned in the above description and also the features that can only be inferred from the drawing are further refinements of the invention, even if they are not particularly emphasized and are not mentioned in the claims.

Claims (9)

1. Verfahren zum Veredeln von Papier, bei dem eine Papierbahn durch wenigstens einen Walzenspalt, in dem auf sie ein Druck ausgeübt wird, hindurchgeführt und die Feuchtigkeit der Papierbahn auf einen Endwert vermindert wird, dadurch gekennzeichnet, daß die Papierbahn mit einer über dem Endwert der Feuchtigkeit liegenden Feuchte aus dem Walzenspalt oder dem letzten der Walzenspalte herausgeführt und danach zur Reduzierung der Feuchtigkeit auf den Endwert beim Durchlauf durch eine Trocknungseinrichtung einem Trocknungsprozeß ausgesetzt wird.1. A process for refining paper, in which a paper web is passed through at least one nip in which pressure is exerted on it and the moisture of the paper web is reduced to a final value, characterized in that the paper web with an over the final value of Moisture-containing moisture is led out of the nip or the last of the nips and is then subjected to a drying process to reduce the moisture to the final value when passing through a drying device. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei einem Durchlauf der Papierbahn durch einen Kalander mit einer das Erreichen des Endwertes der Feuchte beim Austritt gestattenden Anzahl von Walzen, von denen ein Teil beheizt ist, zur Erzielung einer über dem Endwert der Feuchte liegenden Feuchtigkeitsgehalt der Papierbahn beim Austritt aus dem Kalander dessen Arbeitsgeschwindigkeit entsprechend erhöht wird.2. The method according to claim 1, characterized in that when the paper web is passed through a calender with a number of rollers which allow the end value of the moisture to be reached at the outlet, some of which is heated, to achieve a value above the end value of the moisture Moisture content of the paper web as it emerges from the calender, the working speed of which is increased accordingly. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Durchlauf der Papierbahn durch den Walzenspalt oder die Walzenspalte bei einem verminderten Liniendruck erfolgt.3. The method according to claim 1 or 2, characterized in that the passage of the paper web through the nip or the nips takes place at a reduced line pressure. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Durchlauf der Papierbahn durch den Walzenspalt oder die Walzenspalte bei einer verminderten Temperatur der Walzen erfolgt.4. The method according to any one of claims 1 to 3, characterized in that the passage of the paper web through the nip or the nips takes place at a reduced temperature of the rollers. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zur Erzielung eines über dem Endwert der Feuchte liegenden Feuchtigkeitsgehalts der Papierbahn bei deren Austritt aus dem letzten Walzenspalt eine Vorrichtung mit einer verkleinerten Anzahl von Walzenspalten eingesetzt wird.5. The method according to any one of claims 1 to 4, characterized in that a device with a reduced number of nips is used to achieve a moisture content of the paper web lying above the final value of the moisture when it exits from the last nip. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Papierbahn während des Trocknungsprozesses einer Konvektionstrocknung unterworfen wird.6. The method according to any one of claims 1 to 5, characterized in that the paper web is subjected to convection drying during the drying process. 7. Vorrichtung zur Durchführung des Verfahrens gemäß Anspruch 1, dadurch gekennzeichnet, daß einer als Verdichtungskalander (1) oder als Satinierkalander oder als Glättwerk ausgebildeten Einrichtung eine Trocknungseinrichtung (3) nachgeordnet ist.7. A device for performing the method according to claim 1, characterized in that a drying device (3) is arranged as a compression calender (1) or as a calendering calender or as a smoothing device. 8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Trocknungseinrichtung als Konvektionstrockner (3) ausgebildet ist.8. The device according to claim 7, characterized in that the drying device is designed as a convection dryer (3). 9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß der Konvektionstrockner (3) längs der Durchlaufstrecke der Papierbahn mehrere im wesentlichen gegeneinander gerichtete Luftströme erzeugende Düsenpaare (5, 6) aufweist.9. The device according to claim 8, characterized in that the convection dryer (3) along the passage of the paper web has a plurality of substantially oppositely directed air flows generating nozzle pairs (5, 6).
EP85105760A 1984-07-28 1985-05-10 Process for grading paper, and apparatus for the application of the process Expired - Lifetime EP0169988B2 (en)

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Application Number Priority Date Filing Date Title
AT85105760T ATE39373T1 (en) 1984-07-28 1985-05-10 PROCESS FOR REFINING PAPER AND DEVICE FOR CARRYING OUT THE PROCESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3427967A DE3427967C2 (en) 1984-07-28 1984-07-28 Process for finishing paper and apparatus for carrying out the process
DE3427967 1984-07-28

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EP0169988A2 true EP0169988A2 (en) 1986-02-05
EP0169988A3 EP0169988A3 (en) 1986-12-30
EP0169988B1 EP0169988B1 (en) 1988-12-21
EP0169988B2 EP0169988B2 (en) 1996-07-03

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EP85105760A Expired - Lifetime EP0169988B2 (en) 1984-07-28 1985-05-10 Process for grading paper, and apparatus for the application of the process

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AT (1) ATE39373T1 (en)
DE (2) DE3427967C2 (en)
FI (1) FI82108C (en)

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Publication number Priority date Publication date Assignee Title
EP0539271A2 (en) * 1991-10-23 1993-04-28 Westvaco Corporation Method for improving the printability of web offset paper

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4335053A1 (en) * 1993-10-14 1995-04-20 Kleinewefers Gmbh Method and device for finishing a paper web
DE102008043867A1 (en) 2008-11-19 2010-05-20 Voith Patent Gmbh Method and device for treating release base papers and separator tube paper

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Publication number Priority date Publication date Assignee Title
GB673526A (en) * 1950-07-07 1952-06-04 Riegel Paper Corp Improvements in manufacture of paper

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Publication number Priority date Publication date Assignee Title
JPS5951638B2 (en) * 1975-09-18 1984-12-14 神崎製紙 （株） Method for producing roughened paper with uniform transparency

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB673526A (en) * 1950-07-07 1952-06-04 Riegel Paper Corp Improvements in manufacture of paper

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0539271A2 (en) * 1991-10-23 1993-04-28 Westvaco Corporation Method for improving the printability of web offset paper
EP0539271A3 (en) * 1991-10-23 1993-05-12 Westvaco Corporation Method for improving the printability of web offset paper

Also Published As

Publication number Publication date
FI82108B (en) 1990-09-28
FI852773A0 (en) 1985-07-15
FI852773L (en) 1986-01-29
EP0169988A3 (en) 1986-12-30
EP0169988B1 (en) 1988-12-21
DE3427967C2 (en) 1986-07-24
FI82108C (en) 1991-01-10
DE3427967A1 (en) 1986-02-06
DE3566916D1 (en) 1989-01-26
ATE39373T1 (en) 1989-01-15
EP0169988B2 (en) 1996-07-03

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