EP1006327A2 - Drying of fibrous web - Google Patents

Drying of fibrous web Download PDF

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Publication number
EP1006327A2
EP1006327A2 EP99121524A EP99121524A EP1006327A2 EP 1006327 A2 EP1006327 A2 EP 1006327A2 EP 99121524 A EP99121524 A EP 99121524A EP 99121524 A EP99121524 A EP 99121524A EP 1006327 A2 EP1006327 A2 EP 1006327A2
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EP
European Patent Office
Prior art keywords
fibrous web
web
laser radiation
lasers
laser
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99121524A
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German (de)
French (fr)
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EP1006327A3 (en
Inventor
Markus Oechsle
Frank Wegehaupt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
Voith Sulzer Papiertechnik Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Voith Paper Patent GmbH, Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1006327A2 publication Critical patent/EP1006327A2/en
Publication of EP1006327A3 publication Critical patent/EP1006327A3/en
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/16—Drying webs by electrical heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/008—Controlling the moisture profile across the width of the material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun

Definitions

  • the invention relates to a method and the associated device for drying a fibrous web, in particular a paper, tissue or cardboard web.
  • the fibrous webs are currently used for drying over heated cylinders guided. With this very expensive in terms of space and energy consumption Process often results in an uneven distribution of moisture across the fibrous web. Certain zones are additionally moistened to correct this cross moisture profile or heated, the heating generally inductive, by means of infrared emitters or done with steam. However, these corrective measures are due to the relatively large size Zone widths, the blurred zone boundaries and the low transferable Unsatisfactory energy density. There is also the risk of fire with infrared emitters as well as the energetic disadvantage when moistening.
  • the object of the invention is therefore a method and the associated To create a device for drying a fibrous web, which is not only space-saving is and has a good efficiency, but also a high transferable Enables energy density and an influence on the moisture cross profile.
  • the object was achieved in that the fibrous web Laser radiation is exposed, the frequency is preferably set so that the laser radiation from water better than from the other components of the Fibrous web is absorbed.
  • Laser radiation not only enables a high transferable energy density but also also the formation of small, sharply defined zones, which makes them special suitable for homogenizing the moisture cross profile of the fibrous web, however the entire drying process using laser radiation is also possible.
  • the intensity of the laser radiation should be transverse considered to be controllable in zones separately from the fibrous web. It is also for this advantageous if the extent of the area affected by the laser radiation is controllable at least in the longitudinal direction of the fibrous web. The latter allows the Increase or change in the power to be transmitted with constant Energy density / area.
  • the Lasers are switched off when the fibrous web is torn off.
  • a high energy density and a relatively even effect on the Fibrous web can be achieved when there are free trains when lasers are on are arranged on both sides of the fibrous web.
  • a plurality of lasers 2 are located on both sides, opposite one another with respect to the fibrous web 1 arranged transversely to the fibrous web 1 next to each other. They each form one contiguous row extending over the width of the fibrous web 1, several lasers 2 being combined into a separately controllable zone 4 are. Each zone 4 is connected to a corresponding control and power lines Controller 6 connected.
  • this area has a shield 5. It also has here, for example, the lower row a visible light source 3 for displaying the function and direction of action of the laser 2.
  • the arrangement is at the end of the dry part of a machine Production or refinement of a fibrous web 1 and is used for homogenization the moisture cross profile of the fibrous web 1.
  • the intensity of the laser frame across the fibrous web 1 is considered as well the extension of the area influenced by the laser radiation in the longitudinal direction of the Fibrous web 1 controlled separately in zones. This happens depending on the measured moisture cross profile of the fibrous web 1, with some zones 4 can be switched off if, for example, only the edges are affected should. In addition, all lasers 2 are switched off in the event of a web break.
  • the Lasers 2 have a very short response time and offer the possibility of Transmission of large amounts of energy to a clearly defined area of the Fibrous web 1, since the frequency of the laser radiation is set so that the Laser radiation is predominantly absorbed by the water of the fibrous web 1. If no free move is available or suitable, d. H. the fibrous web 1 of one The roller 2 and / or a belt is supported, so the lasers 2 are on the free side the fibrous web 1 arranged.

Abstract

The appts. to dry a fiber web (1) uses a laser light. Its frequency is set so that the laser beams are better absorbed by water than the other components of the web (1). The intensity of the laser light is controlled in separate zones, across the web (1). The extension of the web zones affected by the laser light can be controlled, at least on the longitudinal line of the web (1). The laser (2) is disconnected on a web (1) break. A number of lasers (2) are deployed across the web (1) width, aligned at the web, and they can be on both sides of the web (1). The machine is shrouded at the laser sites. At least one visible light source (3) is fitted in a row of lasers (2).

Description

Die Erfindung betrifft ein Verfahren sowie die dazugehörige Vorrichtung zur Trocknung einer Faserstoffbahn, insbesondere einer Papier-, Tissue- oder Kartonbahn.The invention relates to a method and the associated device for drying a fibrous web, in particular a paper, tissue or cardboard web.

Gegenwärtig werden die Faserstoffbahnen zur Trocknung über beheizte Zylinder geführt. Bei diesem hinsichtlich Platzbedarf und Energieaufwand sehr aufwendigen Prozeß stellt sich oft eine ungleiche Verteilung der Feuchte quer zur Faserstoffbahn ein. Zur Korrektur dieses Feuchtequerprofils werden bestimmte Zonen zusätzlich befeuchtet oder beheizt, wobei die Beheizung im allgemeinen induktiv, mittels Infrarot-Strahler oder mit Dampf erfolgt. Diese Korrekturmaßnahmen sind jedoch wegen der relativ großen Zonenbreiten, der unscharfen Zonengrenzen sowie der geringen übertragbaren Energiedichte unbefriedigend. Hinzu kommen die Brandgefahr bei Infrarot-Strahlern sowie der energetische Nachteil beim Befeuchten.The fibrous webs are currently used for drying over heated cylinders guided. With this very expensive in terms of space and energy consumption Process often results in an uneven distribution of moisture across the fibrous web. Certain zones are additionally moistened to correct this cross moisture profile or heated, the heating generally inductive, by means of infrared emitters or done with steam. However, these corrective measures are due to the relatively large size Zone widths, the blurred zone boundaries and the low transferable Unsatisfactory energy density. There is also the risk of fire with infrared emitters as well as the energetic disadvantage when moistening.

Die Aufgabe der Erfindung ist es daher, ein Verfahren sowie die dazugehörige Vorrichtung zur Trocknung einer Faserstoffbahn zu schaffen, die nicht nur platzsparend ist und einen guten Wirkungsgrad besitzt, sondern auch eine hohe übertragbare Energiedichte sowie eine Beeinflussung des Feuchtequerprofils ermöglicht.The object of the invention is therefore a method and the associated To create a device for drying a fibrous web, which is not only space-saving is and has a good efficiency, but also a high transferable Enables energy density and an influence on the moisture cross profile.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, daß die Faserstoffbahn Laserstrahlung ausgesetzt wird, deren Frequenz vorzugsweise so eingestellt ist, daß die Laserstrahlung vom Wasser besser als von den anderen Bestandteilen der Faserstoffbahn absorbiert wird.According to the invention the object was achieved in that the fibrous web Laser radiation is exposed, the frequency is preferably set so that the laser radiation from water better than from the other components of the Fibrous web is absorbed.

Die Laserstrahlung ermöglicht nicht nur eine hohe übertragbare Energiedichte sondern auch die Bildung von kleinen, scharf abgegrenzten Zonen, wodurch sie sich besonders zur Vergleichmäßigung des Feuchtequerprofils der Faserstoffbahn eignet, wobei jedoch auch der gesamte Trocknungsvorgang über Laserstrahlung möglich ist.Laser radiation not only enables a high transferable energy density but also also the formation of small, sharply defined zones, which makes them special suitable for homogenizing the moisture cross profile of the fibrous web, however the entire drying process using laser radiation is also possible.

Dadurch, daß der wesentliche Energieanteil vom Wasser aufgenommen wird, verbessert sich der Wirkungsgrad wesentlich. Außerdem ist die Übertragung mit hoher Energiedichte möglich, ohne die Faserstoffbahn zu schädigen. Wegen des, bei konventioneller Trocknung über beheizte Zylinder mit sinkender Feuchte auch sich verschlechternden Wirkungsgrades, ist daher der Einsatz des Verfahrens insbesondere am Ende des Trocknungsvorganges von Vorteil.
Unter Umständen kann jedoch auch eine Erwärmung der Fasern hingenommen werden, was den geeigneten Frequenzbereich der Laserstrahlung vergrößert.The fact that the major part of the energy is absorbed by the water significantly improves the efficiency. In addition, transmission with high energy density is possible without damaging the fibrous web. Because of the deterioration in efficiency with conventional drying using heated cylinders with decreasing humidity, the use of the method is therefore particularly advantageous at the end of the drying process.
Under certain circumstances, however, heating of the fibers can also be accepted, which increases the suitable frequency range of the laser radiation.

Zur Beeinflussung des Feuchtequerprofils sollte die Intensität der Laserstrahlung quer zur Faserstoffbahn betrachtet zonenweise separat steuerbar sein. Hierzu ist es auch von Vorteil, wenn die Ausdehnung der von der Laserstrahlung beeinflußten Fläche zumindest in Längsrichtung der Faserstoffbahn steuerbar ist. Letzteres erlaubt die Erhöhung bzw. Veränderung der zu übertragenden Leistung bei konstanter Energiedichte/Fläche.In order to influence the moisture cross profile, the intensity of the laser radiation should be transverse considered to be controllable in zones separately from the fibrous web. It is also for this advantageous if the extent of the area affected by the laser radiation is controllable at least in the longitudinal direction of the fibrous web. The latter allows the Increase or change in the power to be transmitted with constant Energy density / area.

Sollten die Lasestrahlen nur in bestimmten Bereichen der Faserstoffbahn, beispielsweise an den Rändern, zum Einsatz kommen, so ist es von Vorteil, wenn die Ausdehnung der bestrahlten Fläche einer Zone, quer zur Faserstoffbahn betrachtet, steuerbar ist. Um Schäden im Hintergrund der Faserstoffbahn zu vermeiden, sollte der Laser bei einem Abriß der Faserstoffbahn abgeschaltet werden.If the laser beams are only in certain areas of the fibrous web, for example at the edges, it is advantageous if the Extension of the irradiated area of a zone, viewed transversely to the fibrous web, is controllable. To avoid damage in the background of the fibrous web, the Lasers are switched off when the fibrous web is torn off.

Zur Realisierung der zonenweisen Steuerung der Laserstrahlung ist es zumindest notwendig mehrere, quer zur Faserstoffbahn nebeneinander angeordnete Laser gegenüber der Faserstoffbahn anzubringen.At least for realizing the zone-wise control of the laser radiation necessary several lasers arranged next to each other across the fiber web to be installed opposite the fibrous web.

Eine hohe Energiedichte sowie eine relativ gleichmäßige Wirkung auf die Faserstoffbahn läßt sich beim Vorhandensein freier Züge erzielen, wenn Laser auf beiden Seiten der Faserstoffbahn angeordnet sind.A high energy density and a relatively even effect on the Fibrous web can be achieved when there are free trains when lasers are on are arranged on both sides of the fibrous web.

Zum Schutz der Umgebung, insbesondere des Bedienpersonals sollte der mit Lasern ausgerüstete Bereich der Maschine nach außen abgeschirmt sein. Außerdem ist es zur Kontrolle der Funktion bei Lasern mit nicht-sichtbarer Laserstrahlung von Vorteil, in einer Reihe quer zur Faserstoffbahn zumindest eine sichtbare Lichtquelle anzuordnen. To protect the environment, especially the operating personnel, use lasers equipped area of the machine must be shielded from the outside. It is also for Checking the function of lasers with invisible laser radiation is an advantage to arrange at least one visible light source in a row transverse to the fibrous web.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der Zeichnung zeigt die Figur eine schematische Darstellung der erfindungsgemäßen Vorrichtung.The invention will be explained in more detail below using an exemplary embodiment. In The drawing shows the figure a schematic representation of the invention Contraption.

Beidseitig, sich bezüglich der Faserstoffbahn 1 gegenüberliegend, sind mehrere Laser 2 quer zur Faserstoffbahn 1 nebeneinander angeordnet. Sie bilden hierbei jeweils eine zusammenhängende sich über die Breite der Faserstoffbahn 1 erstreckende Reihe, wobei jeweils mehrere Laser 2 zu einer separat steuerbaren Zone 4 zusammengefaßt sind. Jede Zone 4 ist über entsprechende Steuer- und Energieleitungen mit einer Steuerung 6 verbunden.A plurality of lasers 2 are located on both sides, opposite one another with respect to the fibrous web 1 arranged transversely to the fibrous web 1 next to each other. They each form one contiguous row extending over the width of the fibrous web 1, several lasers 2 being combined into a separately controllable zone 4 are. Each zone 4 is connected to a corresponding control and power lines Controller 6 connected.

Zum Schutz der Umgebung hat dieser Bereich eine Abschirmung 5. Außerdem besitzt hier beispielhaft die untere Reihe eine sichtbare Lichtquelle 3 zur Anzeige der Funktion und Wirkungsrichtung der Laser 2.To protect the environment, this area has a shield 5. It also has here, for example, the lower row a visible light source 3 for displaying the function and direction of action of the laser 2.

Die Anordnung befindet sich am Ende des Trockenteiles einer Maschine zur Herstellung bzw. Veredelung einer Faserstoffbahn 1 und dient zur Vergleichmäßigung des Feuchtequerprofils der Faserstoffbahn 1.The arrangement is at the end of the dry part of a machine Production or refinement of a fibrous web 1 and is used for homogenization the moisture cross profile of the fibrous web 1.

Hierzu wird die Intensität der Laserstuhlung quer zur Faserstoffbahn 1 betrachtet sowie die Ausdehnung der von der Laserstrahlung beeinflußten Fläche in Längsrichtung der Faserstoffbahn 1 zonenweise separat gesteuert. Dies geschieht in Abhängigkeit vom gemessenen Feuchtequerprofil der Faserstoffbahn 1, wobei auch einige Zonen 4 abgeschaltet werden können, wenn beispielsweise nur die Ränder beeinflußt werden sollen. Außerdem erfolgt eine Abschaltung aller Laser 2 bei einem Bahnabriß.For this purpose, the intensity of the laser frame across the fibrous web 1 is considered as well the extension of the area influenced by the laser radiation in the longitudinal direction of the Fibrous web 1 controlled separately in zones. This happens depending on the measured moisture cross profile of the fibrous web 1, with some zones 4 can be switched off if, for example, only the edges are affected should. In addition, all lasers 2 are switched off in the event of a web break.

Die Laser 2 besitzen eine sehr kurze Reaktionszeit und bieten die Möglichkeit zur Übertragung großer Energiemengen auf eine scharf abgegrenzte Fläche der Faserstoffbahn 1, da die Frequenz der Laserstrahlung so eingestellt ist, daß die Laserstrahlung überwiegend vom Wasser der Faserstoffbahn 1 absorbiert wird. Falls kein freier Zug vorhanden oder geeignet ist, d. h. die Faserstoffbahn 1 von einer Walze und/oder einem Band gestützt verläuft, so sind die Laser 2 auf der freien Seite der Faserstoffbahn 1 angeordnet.The Lasers 2 have a very short response time and offer the possibility of Transmission of large amounts of energy to a clearly defined area of the Fibrous web 1, since the frequency of the laser radiation is set so that the Laser radiation is predominantly absorbed by the water of the fibrous web 1. If no free move is available or suitable, d. H. the fibrous web 1 of one The roller 2 and / or a belt is supported, so the lasers 2 are on the free side the fibrous web 1 arranged.

Claims (12)

Verfahren zur Trocknung einer Faserstoffbahn (1), insbesondere einer Papier-, Tissue- oder Kartonbahn, dadurch gekennzeichnet, daß die Faserstoffbahn (1) Laserstrahlung ausgesetzt wird.Process for drying a fibrous web (1), in particular a paper, tissue or cardboard web, characterized in that the fibrous web (1) is exposed to laser radiation. Verfahren nach Anspruch 1, dadurch gekennzeichnet daß, die Frequenz der Laserstrahlung so eingestellt ist, daß die Laserstrahlung vom Wasser besser als von den anderen Bestandteilen der Faserstoffbahn (1) absorbiert wird.Method according to Claim 1, characterized in that the frequency of the laser radiation is set such that the laser radiation is better absorbed by the water than by the other constituents of the fibrous web (1). Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet daß die Intensität der Laserstrahlung quer zur Faserstoffbahn (1) betrachtet zonenweise separat steuerbar ist.Method according to claim 1 or 2, characterized in that the intensity of the laser radiation transverse to the fibrous web (1) can be controlled separately in zones. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet daß die Ausdehnung der von der Laserstrahlung beeinflußten Fläche zumindest in Längsrichtung der Faserstoffbahn (1) steuerbar ist.Method according to one of the preceding claims, characterized in that the extent of the surface influenced by the laser radiation can be controlled at least in the longitudinal direction of the fibrous web (1). Verfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet daß die Ausdehnung der bestrahlten Fläche einer Zone (4) quer zur Faserstoffbahn (1) betrachtet steuerbar ist.Method according to Claim 3 or 4, characterized in that the extent of the irradiated surface of a zone (4) transverse to the fibrous web (1) can be controlled when viewed. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet daß bei einem Abriß der Faserstoffbahn (1) der Laser (2) abgeschaltet wird.Method according to one of claims 1 to 5, characterized in that when the fibrous web (1) breaks, the laser (2) is switched off. Vorrichtung zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet daß mehrere, quer zur Faserstoffbahn (1) nebeneinander angeordnete Laser (2) gegenüber der Faserstoffbahn (1) angebracht sind.Device for carrying out the method according to one of the preceding claims, characterized in that a plurality of lasers (2) arranged next to one another transversely to the fibrous web (1) are attached opposite the fibrous web (1). Vorrichtung nach Anspruch 7, dadurch gekennzeichnet daß Laser (2) auf beiden Seiten der Faserstoffbahn (1) angeordnet sind. Apparatus according to claim 7, characterized in that lasers (2) are arranged on both sides of the fibrous web (1). Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß der mit Lasern (2) ausgerüstete Bereich der Maschine nach außen abgeschirmt ist.Device according to claim 7 or 8, characterized in that the area of the machine equipped with lasers (2) is shielded from the outside. Vorrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß in einer Reihe von Lasern (2) zumindest eine sichtbare Lichtquelle (3) angeordnet ist.Device according to one of claims 7 to 9, characterized in that at least one visible light source (3) is arranged in a row of lasers (2). Anwendung des Verfahrens in Maschinen zur Herstellung und/oder Veredelung von Faserstoffbahnen nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet daß die Faserstoffbahn (1) überwiegend am Ende des Trocknungsvorganges Laserstrahlung ausgesetzt wird.Application of the method in machines for the production and / or finishing of fibrous webs according to one of Claims 1 to 6, characterized in that the fibrous web (1) is predominantly exposed to laser radiation at the end of the drying process. Anwendung des Verfahrens nach Anspruch 11, dadurch gekennzeichnet, daß die Laserstrahlung zur Vergleichmäßigung des Feuchtequerprofils der Faserstoffbahn (1) eingesetzt wird.Application of the method according to claim 11, characterized in that the laser radiation is used to even out the moisture cross profile of the fibrous web (1).
EP99121524A 1998-12-04 1999-10-29 Drying of fibrous web Withdrawn EP1006327A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19855940A DE19855940A1 (en) 1998-12-04 1998-12-04 Fibrous web drying
DE19855940 1998-12-04

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EP1006327A2 true EP1006327A2 (en) 2000-06-07
EP1006327A3 EP1006327A3 (en) 2001-12-05

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WO2003002922A1 (en) * 2001-06-29 2003-01-09 Adphos Advanced Photonics Technologies Ag Method and device for drying and/or cross-linking or heating by means of electromagnetic radiation

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US6675494B1 (en) 2004-01-13
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