EP3601666B1 - Web treatment - Google Patents

Web treatment Download PDF

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Publication number
EP3601666B1
EP3601666B1 EP18702468.2A EP18702468A EP3601666B1 EP 3601666 B1 EP3601666 B1 EP 3601666B1 EP 18702468 A EP18702468 A EP 18702468A EP 3601666 B1 EP3601666 B1 EP 3601666B1
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EP
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Prior art keywords
fibrous web
smoothing
process according
web
cooled
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EP18702468.2A
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German (de)
French (fr)
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EP3601666A1 (en
Inventor
Guenter Bonk
Guenther Kriechbaum
Thomas Mack
Bettina Grashof
Joachim Grabscheid
Xiaowu Zhang
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Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/009—Apparatus for glaze-coating paper webs
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper

Definitions

  • the invention relates to a method for treating a fibrous web, in particular a paper or cardboard web, in the end section of a machine for producing the same, which has a drying section for drying, a first smoothing device for pre-smoothing, a coating device for applying coating paint, and a further smoothing device and a winding device for winding up the finished fibrous web, wherein the fibrous web is guided between the drying section and the winding device through at least one cooling unit with evaporative cooling.
  • a paper or cardboard machine with a headbox, former, press and dryer section is usually used.
  • a calender and/or a coating device are usually arranged at the exit of the drying section or behind a drying group within the drying section.
  • the web is smoothed and, if necessary, compacted in the calender.
  • a pigment-containing coating color is applied to one or both surfaces of the web.
  • the object of the invention is to ensure volume-saving smoothing and, if possible, improved surface quality when rolling up.
  • the object was achieved in that the fibrous web is cooled in front of the first and between the first and the further smoothing device by means of at least one cooling unit.
  • the fibrous web between the further smoothing device and the winding device should also be cooled by means of at least one cooling unit.
  • the fibrous web is cooled and moistened by means of a cooling unit in such a way that the absolute moisture content changes by less than 1% and preferably remains approximately constant.
  • the cooling of the fibrous web is the basis for volume-saving smoothing and the least possible impairment of the line when rolling up.
  • Evaporative cooling proves to be efficient cooling.
  • heating of the fibrous web during smoothing and painting also leads to a loss of moisture.
  • the temperature of the fibrous web should also fluctuate as little as possible in this section of the machine. It is therefore preferable to cool at several points spaced apart from one another in the direction of web travel.
  • the fibrous web should be cooled such that the temperature of the fibrous web in front of the rewinder is at most 50 ° C.
  • the fibrous web should be cooled for the first time before the first smoothing device.
  • Cooling is preferably carried out using air. Because of the associated evaporative cooling, the fibrous web in the cooling unit should be moistened using sprayed water.
  • the fibrous web should preferably be heated and moistened on both sides using steam.
  • the heating is limited to the surface area of the fibrous web, so that volume-saving smoothing can still be guaranteed due to the cool core of the fibrous web.
  • cooling can be carried out using evaporative cooling.
  • cooling and/or moistening of the fibrous web can be adapted to the needs and the nature of the web, i.e., for example, that the fibrous web can be acted upon on one or both sides and the moistening also takes place at several points spaced apart from one another in the web running direction.
  • At least one side of the fibrous web should be heated in each smoothing device. This means that at least one of the smoothing rollers of the smoothing devices is heated.
  • the smoothing is carried out in the following, further smoothing device with relatively low pressing pressures, which is why it is advantageous if the total residence time of the fibrous web in the smoothing gap or gaps of the further smoothing machine is significantly longer than in the smoothing gap or gaps in the first smoothing machine .
  • the fibrous web should be smoothed in the further smoothing device using smoothing rollers, at least one of which has an elastic jacket cover.
  • the first smoothing device only has smoothing rollers with a hard outer surface.
  • FIG. 1 shows a system diagram of an end section of a machine for producing a paper or cardboard web.
  • the sheet is formed in the former from at least 3, maximum 5 layers, with at least one layer being formed by a fourdrinier wire.
  • the fibrous web 1 passes through at least two elongated press nips, the fibrous web 1 passing through the first press nip together with an endless, water-absorbing dewatering belt on both sides and the fibrous web 1 coming into direct contact with a smooth press roller in the last press nip .
  • the first drying group is formed by only 2 to 4 drying cylinders and has only one drying wire, preferably running endlessly over the fibrous web 1, which guides the fibrous web 1 around the drying cylinders.
  • a medium preferably starch
  • a medium can be applied to the fibrous web 1 on one or both sides via a coating unit.
  • the fibrous web 1 is exposed to ambient air on both sides by a first cooling unit 6.
  • the temperature of the fibrous web 1 decreases from 70 to 100 ° C to values between 10 and 40 ° C.
  • the humidification device 8 in the form of a steam blowing box applies steam to the fibrous web 1 on both sides, which leads to the heating of the steamed web surface but also to the formation of condensation on it.
  • the re-moistening supports the subsequent smoothing, especially when the web side with the condensate layer comes into contact with a heated smoothing roller of the first smoothing device 3.
  • the heating caused by the steam does not have a significant effect on the cool core of the fibrous web 1, so that the smoothing in the first smoothing device 3 takes place in a volume-conserving manner.
  • the first smoothing device 3 is formed here by two smoothing rollers with a hard outer surface pressed against one another, which allows intensive smoothing and thickness profiling. In addition, at least one of the smoothing rollers is heated from the inside and/or outside.
  • the fibrous web 1 enters a coating device 9 with two to five separate coating units, in which a pigment-containing line is applied to one or both sides of the fibrous web 1 in a manner known per se.
  • the web temperature rises again to values of 60 to 90°C.
  • the fibrous web 1 is cooled again to a temperature of less than 50 ° C in front of the winding device 5 in at least one further cooling unit 7, 10.
  • the fibrous web 1 can be smoothed in a volume-saving manner due to the relatively low temperature via a further smoothing device 4 located between the coating device 9 and the winding device 5. Therefore, at least one of the further cooling units 7 should be present between the coating device 9 and the further smoothing device 4.
  • the further smoothing device 4 is also formed by two smoothing rollers pressed against one another, one of which is heated.
  • a smoothing roller has an elastic jacket cover.
  • this smoothing gap is designed to be extended, so that the residence time of the fibrous web 1 in this smoothing gap is significantly longer than in the smoothing gap of the first smoothing device 3.
  • the smoothing in the smoothing gap of the further smoothing device 4 can be carried out with lower pressing pressure, which protects the volume.
  • the fibrous web 1 reaches the winding device 5 for winding, with a further cooling unit 10 being able to be arranged between the smoothing device 4 and the winding device 5.
  • the fibrous web 1 between the drying section 2 and the rewinding device 5 is moistened and cooled via the respective cooling units 6,7,10 in such a way that the moisture content changes absolutely by less than 1% across each cooling unit 6,7,10 and preferably remains approximately the same.
  • the moisture content of the fibrous web 1 in this end section of the machine is between 6 and 11%.
  • the fibrous web 1 is cooled in such a way that the temperature of the fibrous web 1 in front of the reeling device 5 is at most 50 ° C.

Description

Die Erfindung betrifft ein Verfahren zur Behandlung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn im Endabschnitt einer Maschine zur Herstellung derselben, welcher in Bahnlaufrichtung aufeinander folgend eine Trockenpartie zur Trocknung, eine erste Glättvorrichtung zur Vorglättung, eine Streichvorrichtung zum Auftrag von Streichfarbe, eine weitere Glättvorrichtung sowie eine Aufrollvorrichtung zum Aufwickeln der fertigen Faserstoffbahn umfasst, wobei die Faserstoffbahn zwischen Trockenpartie und Aufrollvorrichtung durch zumindest eine Kühleinheit mit Verdunstungskühlung geführt wird.The invention relates to a method for treating a fibrous web, in particular a paper or cardboard web, in the end section of a machine for producing the same, which has a drying section for drying, a first smoothing device for pre-smoothing, a coating device for applying coating paint, and a further smoothing device and a winding device for winding up the finished fibrous web, wherein the fibrous web is guided between the drying section and the winding device through at least one cooling unit with evaporative cooling.

Zur Herstellung von Papier- oder Kartonbahnen verwendet man üblicherweise eine Papier- oder Kartonmaschine mit Stoffauflauf, Former, Presse und Trockenpartie. Am Ausgang der Trockenpartie oder hinter einer Trockengruppe innerhalb der Trockenpartie sind meist ein Kalander und/oder eine Streicheinrichtung angeordnet. Im Kalander wird die Bahn geglättet und gegebenenfalls auch verdichtet. Demgegenüber wird in einer Streicheinrichtung eine pigmenthaltige Streichfarbe auf eine oder beide Oberflächen der Bahn aufgetragen.To produce paper or cardboard webs, a paper or cardboard machine with a headbox, former, press and dryer section is usually used. A calender and/or a coating device are usually arranged at the exit of the drying section or behind a drying group within the drying section. The web is smoothed and, if necessary, compacted in the calender. In contrast, in a coating device, a pigment-containing coating color is applied to one or both surfaces of the web.

Zur Vergleichmäßigung der Feuchte der Bahn in Querrichtung ist es bekannt, vor dem Kalander Dampf oder Wasser auf die Bahn aufzutragen.To even out the moisture content of the web in the transverse direction, it is known to apply steam or water to the web before the calender.

Problematisch ist allerdings die Temperierung der Faserstoffbahn als Grundlage für eine optimale Glättung und Aufrollung. Hierzu beschreibt die EP 2 682 520 einen Lösungsansatz.However, the temperature control of the fibrous web as the basis for optimal smoothing and rolling is problematic. This describes the EP 2 682 520 a solution approach.

Die Aufgabe der Erfindung ist die Gewährleistung einer volumenschonenden Glättung sowie möglichst auch einer verbesserten Oberflächenqualität bei der Aufrollung.The object of the invention is to ensure volume-saving smoothing and, if possible, improved surface quality when rolling up.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass die Faserstoffbahn vor der ersten und zwischen der ersten und der weiteren Glättvorrichtung mittels jeweils wenigstens einer Kühleinheit gekühlt wird.According to the invention, the object was achieved in that the fibrous web is cooled in front of the first and between the first and the further smoothing device by means of at least one cooling unit.

Außerdem sollte die Faserstoffbahn zwischen der weiteren Glättvorrichtung und der Aufrollvorrichtung ebenfalls mittels zumindest einer Kühleinheit gekühlt werden.In addition, the fibrous web between the further smoothing device and the winding device should also be cooled by means of at least one cooling unit.

In beiden Fällen ist es von Vorteil, wenn die Faserstoffbahn mittels Kühleinheit derart gekühlt und befeuchtet wird, dass sich der Feuchtegehalt absolut um weniger als 1% ändert und vorzugsweise annähernd konstant bleibt.In both cases, it is advantageous if the fibrous web is cooled and moistened by means of a cooling unit in such a way that the absolute moisture content changes by less than 1% and preferably remains approximately constant.

Die Kühlung der Faserstoffbahn ist Grundlage für ein volumenschonendes Glätten sowie eine möglichst geringe Beeinträchtigung des Strichs bei der Aufrollung.The cooling of the fibrous web is the basis for volume-saving smoothing and the least possible impairment of the line when rolling up.

Als effiziente Kühlung erweist sich dabei die Verdunstungskühlung. Daneben führen aber auch Erwärmungen der Faserstoffbahn beim Glätten und beim Streichen zum Verlust an Feuchte.Evaporative cooling proves to be efficient cooling. In addition, heating of the fibrous web during smoothing and painting also leads to a loss of moisture.

Ein zu starkes Absinken des Feuchtegehalts beeinflusst jedoch insbesondere das Glättergebnis der weiteren Glättvorrichtung sowie das Aufwickeln negativ.However, an excessive drop in the moisture content has a particularly negative impact on the smoothing result of the further smoothing device and the winding.

Insgesamt hat es sich für die meisten Bahnsorten als optimal erwiesen, wenn der Feuchtegehalt der Faserstoffbahn zwischen der Trockenpartie und der Aufrollvorrichtung bei möglichst geringer Veränderung im Bereich zwischen 6 und 11% liegt.Overall, it has proven to be optimal for most types of web if the moisture content of the fibrous web between the drying section and the rewinder is in the range between 6 and 11% with as little change as possible.

Auch die Temperatur der Faserstoffbahn sollte in diesem Abschnitt der Maschine möglichst wenig schwanken. Daher ist mit Vorzug an mehreren in Bahnlaufrichtung voneinander beabstandeten Stellen zu kühlen.The temperature of the fibrous web should also fluctuate as little as possible in this section of the machine. It is therefore preferable to cool at several points spaced apart from one another in the direction of web travel.

Im Ergebnis sollte die Faserstoffbahn derart gekühlt werden, dass die Temperatur der Faserstoffbahn vor der Aufrollvorrichtung höchstens 50°C beträgt.As a result, the fibrous web should be cooled such that the temperature of the fibrous web in front of the rewinder is at most 50 ° C.

Wegen der hohen Temperatur der Faserstoffbahn am Ende der Trockenpartie sollte die Faserstoffbahn vor der ersten Glättvorrichtung erstmals gekühlt werden.Because of the high temperature of the fibrous web at the end of the drying section, the fibrous web should be cooled for the first time before the first smoothing device.

Die Kühlung erfolgt vorzugsweise mit Luftbeaufschlagung. Wegen der damit einhergehenden Verdunstungskühlung sollte die Faserstoffbahn in der Kühleinheit mittels aufgesprühten Wassers befeuchtet werden.Cooling is preferably carried out using air. Because of the associated evaporative cooling, the fibrous web in the cooling unit should be moistened using sprayed water.

Nach der ersten Kühlung mittels der ersten Kühleinheit und vor der ersten Glättvorrichtung sollte die Faserstoffbahn vorzugsweise beidseitig mittels Dampf erwärmt und befeuchtet werden.After the first cooling by means of the first cooling unit and before the first smoothing device, the fibrous web should preferably be heated and moistened on both sides using steam.

Bei der Beaufschlagung mittels Dampf kommt es auf der beaufschlagten Seite der Faserstoffbahn zur Kondensatbildung und Erwärmung.When steam is applied, condensation forms and heats up on the exposed side of the fibrous web.

Die Erwärmung beschränkt sich aber auf den Oberflächenbereich der Faserstoffbahn, so dass wegen des kühlen Kerns der Faserstoffbahn dennoch ein volumenschonendes Glätten gewährleistet werden kann.However, the heating is limited to the surface area of the fibrous web, so that volume-saving smoothing can still be guaranteed due to the cool core of the fibrous web.

Auch nach der Streichvorrichtung kann die Kühlung mittels Verdunstungskühlung erfolgen.Even after the coating device, cooling can be carried out using evaporative cooling.

Es versteht sich, dass Kühlung und/oder Befeuchtung der Faserstoffbahn den Bedürfnissen und der Bahnbeschaffenheit angepasst werden können, d.h. beispielsweise, dass die Faserstoffbahn ein- oder beidseitig beaufschlagt werden kann und auch die Befeuchtung an mehreren in Bahnlaufrichtung voneinander beabstandeten Stellen erfolgt.It is understood that cooling and/or moistening of the fibrous web can be adapted to the needs and the nature of the web, i.e., for example, that the fibrous web can be acted upon on one or both sides and the moistening also takes place at several points spaced apart from one another in the web running direction.

Zur Intensivierung der Glättung sollte zumindest eine Seite der Faserstoffbahn in jeder Glättvorrichtung beheizt werden. Dies bedeutet, dass zumindest jeweils eine der Glättwalzen der Glättvorrichtungen beheizt ist.To intensify the smoothing, at least one side of the fibrous web should be heated in each smoothing device. This means that at least one of the smoothing rollers of the smoothing devices is heated.

Zwecks einer volumenschonenden Satinage erfolgt die Glättung in der folgenden, weiteren Glättvorrichtung mit relativ geringen Pressdrücken, weshalb es von Vorteil ist, wenn die gesamte Verweilzeit der Faserstoffbahn in dem oder den Glättspalten der weiteren Glättvorrichtung wesentlich länger als in dem oder den Glättspalten der ersten Glättvorrichtung ist.For the purpose of volume-saving calendering, the smoothing is carried out in the following, further smoothing device with relatively low pressing pressures, which is why it is advantageous if the total residence time of the fibrous web in the smoothing gap or gaps of the further smoothing machine is significantly longer than in the smoothing gap or gaps in the first smoothing machine .

Aus gleichem Grund sollte die Glättung der Faserstoffbahn in der weiteren Glättvorrichtung mittels Glättwalzen erfolgen, von denen wenigstens eine einen elastischen Mantelbezug aufweist.For the same reason, the fibrous web should be smoothed in the further smoothing device using smoothing rollers, at least one of which has an elastic jacket cover.

Im Interesse einer zusätzlichen Dickenquerprofil-Kalibrierung ist es dagegen vorteilhaft, wenn die erste Glättvorrichtung nur Glättwalzen mit harter Mantelfläche besitzt.In the interest of additional cross-thickness profile calibration, however, it is advantageous if the first smoothing device only has smoothing rollers with a hard outer surface.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur ein Anlagenschema eines Endabschnitts einer Maschine zur Herstellung einer Papier- oder Kartonbahn.The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing, the figure shows a system diagram of an end section of a machine for producing a paper or cardboard web.

Am Beginn der Maschine erfolgt die Blattbildung im Former aus mindestens 3, maximal 5 Lagen, wobei mindestens eine Lage von einem Langsieb gebildet wird.At the beginning of the machine, the sheet is formed in the former from at least 3, maximum 5 layers, with at least one layer being formed by a fourdrinier wire.

In einer darauf folgenden Pressenpartie zur Entwässerung durchläuft die Faserstoffbahn 1 mindestens zwei verlängert ausgebildete Presspalte, wobei die Faserstoffbahn 1 den ersten Pressspalt gemeinsam mit beidseitig je einem endlos umlaufenden, wasseraufnehmenden Entwässerungsband passiert und die Faserstoffbahn 1 im letzten Pressspalt direkt mit einer glatten Presswalze in Kontakt kommt.In a subsequent press section for dewatering, the fibrous web 1 passes through at least two elongated press nips, the fibrous web 1 passing through the first press nip together with an endless, water-absorbing dewatering belt on both sides and the fibrous web 1 coming into direct contact with a smooth press roller in the last press nip .

Daran schließt sich in Bahnlaufrichtung 11 eine Trockenpartie mit mehreren Trockengruppen an, in denen die Faserstoffbahn 1 über beheizte Trockenzylinder geführt wird.This is followed in the web running direction 11 by a drying section with several drying groups in which the fibrous web 1 is guided over heated drying cylinders.

Die erste Trockengruppe wird hierbei lediglich von 2 bis 4 Trockenzylindern gebildet und besitzt nur ein, vorzugsweise über der Faserstoffbahn 1 endlos umlaufendes Trockensieb, welches die Faserstoffbahn 1 um die Trockenzylinder führt.The first drying group is formed by only 2 to 4 drying cylinders and has only one drying wire, preferably running endlessly over the fibrous web 1, which guides the fibrous web 1 around the drying cylinders.

Zwischen zwei Trockengruppen kann über ein Streichaggregat ein Medium, bevorzugt Stärke auf die Faserstoffbahn 1 ein- oder beidseitig aufgebracht werden.Between two drying groups, a medium, preferably starch, can be applied to the fibrous web 1 on one or both sides via a coating unit.

Nach der Trockenpartie 2 wird die Faserstoffbahn 1 beidseitig von einer ersten Kühleinheit 6 mit Umgebungsluft beaufschlagt.After the drying section 2, the fibrous web 1 is exposed to ambient air on both sides by a first cooling unit 6.

Infolge der damit verbundenen Verdunstungskühlung vermindert sich die Temperatur der Faserstoffbahn 1 von 70 bis 100°C auf Werte zwischen 10 und 40 °C.As a result of the associated evaporative cooling, the temperature of the fibrous web 1 decreases from 70 to 100 ° C to values between 10 and 40 ° C.

Daran schließt sich eine Befeuchtungsvorrichtung 8 an, bevor die Faserstoffbahn 1 eine erste Glättvorrichtung 3 erreicht.This is followed by a moistening device 8 before the fibrous web 1 reaches a first smoothing device 3.

Die Befeuchtungsvorrichtung 8 in Form eines Dampfblaskastens beaufschlagt die Faserstoffbahn 1 beidseitig mit Dampf, was zur Erwärmung der bedampften Bahnoberfläche aber auch zur Kondensatbildung auf dieser führt.The humidification device 8 in the form of a steam blowing box applies steam to the fibrous web 1 on both sides, which leads to the heating of the steamed web surface but also to the formation of condensation on it.

Die Rückbefeuchtung unterstützt die nachfolgende Glättung, insbesondere wenn die Bahnseite mit der Kondensatschicht mit einer beheizten Glättwalze der ersten Glättvorrichtung 3 in Kontakt kommt.The re-moistening supports the subsequent smoothing, especially when the web side with the condensate layer comes into contact with a heated smoothing roller of the first smoothing device 3.

Die Erwärmung durch den Dampf wirkt sich nicht wesentlich auf den kühlen Kern der Faserstoffbahn 1 aus, so dass die Glättung in der ersten Glättvorrichtung 3 volumenschonend erfolgt.The heating caused by the steam does not have a significant effect on the cool core of the fibrous web 1, so that the smoothing in the first smoothing device 3 takes place in a volume-conserving manner.

Die erste Glättvorrichtung 3 wird hier von zwei gegeneinander gepressten Glättwalzen mit harter Mantelfläche gebildet, was eine intensive Glättung und Dickenprofilierung erlaubt. Zusätzlich ist zumindest eine der Glättwalzen von innen und/oder außen beheizt.The first smoothing device 3 is formed here by two smoothing rollers with a hard outer surface pressed against one another, which allows intensive smoothing and thickness profiling. In addition, at least one of the smoothing rollers is heated from the inside and/or outside.

Nach der ersten Glättvorrichtung 3 gelangt die Faserstoffbahn 1 in eine Streichvorrichtung 9 mit zwei bis fünf separaten Streichaggregaten, in der in an sich bekannter Weise ein pigmenthaltiger Strich auf eine oder auch beide Seiten der Faserstoffbahn 1 aufgetragen wird.After the first smoothing device 3, the fibrous web 1 enters a coating device 9 with two to five separate coating units, in which a pigment-containing line is applied to one or both sides of the fibrous web 1 in a manner known per se.

Als Ergebnis des Streichens bzw. der Trocknung des Strichs steigt die Bahntemperatur wieder auf Werte von 60 bis 90°C.As a result of the coating or the drying of the coating, the web temperature rises again to values of 60 to 90°C.

Aus diesem Grund wird die Faserstoffbahn 1 in zumindest einer weiteren Kühleinheit 7,10 wieder auf eine Temperatur von weniger als 50°C vor der Aufrollvorrichtung 5 gekühlt.For this reason, the fibrous web 1 is cooled again to a temperature of less than 50 ° C in front of the winding device 5 in at least one further cooling unit 7, 10.

Über eine weitere, zwischen Streichvorrichtung 9 und Aufrollvorrichtung 5 vorhandene Glättvorrichtung 4 kann die Faserstoffbahn 1 wegen der relativ geringen Temperatur volumenschonend geglättet werden. Daher sollte wenigstens eine der weiteren Kühleinheiten 7 zwischen der Streichvorrichtung 9 und der weiteren Glättvorrichtung 4 vorhanden sein.The fibrous web 1 can be smoothed in a volume-saving manner due to the relatively low temperature via a further smoothing device 4 located between the coating device 9 and the winding device 5. Therefore, at least one of the further cooling units 7 should be present between the coating device 9 and the further smoothing device 4.

Auch die weitere Glättvorrichtung 4 wird von zwei gegeneinander gepressten Glättwalzen gebildet, von denen eine beheizt ist. Zur schonenden Glättung der gestrichenen Faserstoffbahn 1 weist jedoch eine Glättwalze einen elastischen Mantelbezug auf. Außerdem ist dieser Glättspalt verlängert ausgebildet, so dass die Verweilzeit der Faserstoffbahn 1 in diesem Glättspalt wesentlich länger als in dem Glättspalt der ersten Glättvorrichtung 3 ist.The further smoothing device 4 is also formed by two smoothing rollers pressed against one another, one of which is heated. For gentle smoothing coated fibrous web 1, however, a smoothing roller has an elastic jacket cover. In addition, this smoothing gap is designed to be extended, so that the residence time of the fibrous web 1 in this smoothing gap is significantly longer than in the smoothing gap of the first smoothing device 3.

Auf Grund der längeren Verweilzeit kann die Glättung im Glättspalt der weiteren Glättvorrichtung 4 mit geringerem Pressdruck erfolgen, was das Volumen schont.Due to the longer residence time, the smoothing in the smoothing gap of the further smoothing device 4 can be carried out with lower pressing pressure, which protects the volume.

Nach der weiteren Glättvorrichtung 4 gelangt die Faserstoffbahn 1 zum Aufwickeln zur Aufrollvorrichtung 5, wobei zwischen der Glättvorrichtung 4 und der Aufrollvorrichtung 5 noch eine weitere Kühleinheit 10 angeordnet sein kann.After the further smoothing device 4, the fibrous web 1 reaches the winding device 5 for winding, with a further cooling unit 10 being able to be arranged between the smoothing device 4 and the winding device 5.

Erfindungswesentlich ist, dass die Faserstoffbahn 1 zwischen Trockenpartie 2 und der Aufrollvorrichtung 5 über die jeweiligen Kühleinheiten 6,7,10 derart befeuchtet und gekühlt wird, dass sich der Feuchtegehalt über jede Kühleinheit 6,7,10 absolut um weniger als 1% ändert und vorzugsweise annähernd gleich bleibt.It is essential to the invention that the fibrous web 1 between the drying section 2 and the rewinding device 5 is moistened and cooled via the respective cooling units 6,7,10 in such a way that the moisture content changes absolutely by less than 1% across each cooling unit 6,7,10 and preferably remains approximately the same.

Je nach Papiersorte liegt der Feuchtegehalt der Faserstoffbahn 1 in diesem Endabschnitt der Maschine zwischen 6 und 11%.Depending on the type of paper, the moisture content of the fibrous web 1 in this end section of the machine is between 6 and 11%.

Für die Qualität des Strichs bei der Aufrollung ist es außerdem wichtig, dass die Faserstoffbahn 1 derart gekühlt wird, dass die Temperatur der Faserstoffbahn 1 vor der Aufrollvorrichtung 5 höchstens 50°C beträgt.For the quality of the line during reeling, it is also important that the fibrous web 1 is cooled in such a way that the temperature of the fibrous web 1 in front of the reeling device 5 is at most 50 ° C.

Claims (13)

  1. Method for treating a fibrous web (1), in particular a paper or board web, in the end section of a machine for producing the same, which comprises, following in the web running direction (11), a drying section (2) for drying, a first smoothing device (3) for pre-smoothing, a coating device (9) for applying coating color, a further smoothing device (4) and a winding device (5) for winding up the finished fibrous web (1), wherein the fibrous web (1) is guided between the dryer section (2) and the reeling device (5) through at least one cooling unit (6, 7, 10) with evaporative cooling and is cooled before the first (3) and between the first (3) and the further smoothing device (4) by means of at least one cooling unit (6, 7, 10) in each case, characterized in that the fibrous web (1) is heated and moistened by means of steam after the first cooling and before the first smoothing device (3).
  2. process according to claim 1, characterized in that the fibrous web (1) is cooled between the further smoothing device (4) and the reeling device (5) by means of at least one cooling unit (6, 7, 10).
  3. process according to one of the preceding claims, characterized in that the fibrous web (1) is cooled and moistened by means of the cooling unit (6, 7, 10) in such a way that the moisture content changes by less than 1% in absolute terms.
  4. process according to one of the preceding claims, characterized in that the fibrous web (1) is cooled and moistened by means of the cooling unit (6, 7, 10) in such a way that the moisture content remains approximately the same.
  5. method according to one of the preceding claims, characterized in that the fibrous web (1) is cooled in such a way that the temperature of the fibrous web (1) upstream of the reeling device (5) is at most 50°C.
  6. process according to one of the preceding claims, characterized in that the fibrous web (1) is cooled for the first time before the first smoothing device (3).
  7. process according to one of the preceding claims, characterized in that the fibrous web (1) is moistened with sprayed-on water in the cooling unit (6, 7, 10).
  8. process according to one of the preceding claims, characterized in that the fibrous web (1) is heated and moistened on both sides with steam.
  9. process according to one of the preceding claims, characterized in that the moisture content of the fibrous web (1) between the dryer section (2) and the reeling device (5) is between 6 and 11%.
  10. method according to one of the preceding claims, characterized in that at least one side of the fibrous web (1) is heated in each smoothing device (3, 4).
  11. Method according to one of the preceding claims, characterized in that the total dwell time of the fibrous web (1) in the smoothing gap or gaps of the further smoothing device (4) is substantially longer than in the smoothing gap or gaps of the first smoothing device (3).
  12. process according to one of the preceding claims, characterized in that the smoothing of the fibrous web (1) in the first smoothing device (3) is carried out by means of smoothing rollers with a hard outer surface.
  13. process according to one of the preceding claims, characterized in that the smoothing of the fibrous web (1) in the further smoothing device (4) is carried out by means of smoothing rollers, at least one of which has an elastic cover.
EP18702468.2A 2017-03-21 2018-01-29 Web treatment Active EP3601666B1 (en)

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PCT/EP2018/052064 WO2018171959A1 (en) 2017-03-21 2018-01-29 Web treatment

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FI105935B (en) * 1996-12-03 2000-10-31 Valmet Corp Method for drying paper and dry end of paper machine
FI971301A (en) * 1997-03-27 1998-09-28 Valmet Corp Method for controlling paper curl with a dryer section of a paper machine and a paper or board machine
DE10255907A1 (en) * 2002-11-29 2004-06-24 Voith Paper Patent Gmbh Online paper or carton web glazing assembly transfers a web from the drying station to the first nip enclosed by a drying sieve endless belt
DE102006051537A1 (en) * 2006-10-27 2008-04-30 Voith Patent Gmbh Processing device for paper or card web has fluid application device between drying device and calender roll fitting
DE102010029617A1 (en) * 2010-06-02 2011-12-08 Voith Patent Gmbh Method for producing a coated, multilayer fibrous web
EP2682520B1 (en) * 2012-07-03 2016-06-22 Valmet Technologies, Inc. Method for producing fiber webs and production line for producing fiber webs
EP2765237B1 (en) * 2013-02-06 2016-11-23 Valmet Technologies, Inc. Method for producing a fiber web and production line for producing a fiber web
EP2876206B2 (en) * 2013-11-21 2023-03-01 Valmet Technologies, Inc. Method for producing fiber webs and production line for producing fiber webs

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CN110446811B (en) 2021-06-04
CN110446811A (en) 2019-11-12
EP3601666A1 (en) 2020-02-05

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