EP1527232B1 - Dryer section - Google Patents
Dryer section Download PDFInfo
- Publication number
- EP1527232B1 EP1527232B1 EP03771111.6A EP03771111A EP1527232B1 EP 1527232 B1 EP1527232 B1 EP 1527232B1 EP 03771111 A EP03771111 A EP 03771111A EP 1527232 B1 EP1527232 B1 EP 1527232B1
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- EP
- European Patent Office
- Prior art keywords
- dryer section
- fibrous web
- section according
- moisturizing
- web
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G7/00—Damping devices
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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
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/06—Moisture and basic weight
Definitions
- the invention relates to a drying section for drying a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the fibrous web, in which the fibrous web is guided by at least one drying wire supported over a plurality of heated drying cylinders and guide rolls.
- Such dryer sections have long been in various forms in use. This often leads to the buildup of tension in the fibrous web, which leads to an increased tendency to curl. In addition, the wet transverse profile of the fibrous web is generally not satisfactory, since it comes especially at the edges to over-drying.
- Moistening facilities in calander are from the publications EP 1 199 404 A and US 5 065 873 previously known.
- a method and an apparatus for producing surface-treated printing paper is known from the document WO 00/03087 with moistening of the fibrous web prior to treatment in a calender at different points of the fibrous web previously known.
- the object of the invention is to improve the moisture profile and the curl tendency of the fibrous web by simple means.
- several, preferably two, moistening devices are arranged at different positions relative to the fibrous web within the dryer section, wherein the amount of liquid applied to the fibrous web is separately adjustable in zones transverse to the web running direction, at least in the case of a moistening device.
- At least one, preferably all moistening devices have a plurality of nozzles arranged transversely to the web running direction. It is advantageous if the nozzles are at least partially formed as pneumatic atomizer nozzles.
- the moistening devices apply a total of different amounts of liquid to the fibrous web.
- the moistening provide the liquid with different droplet size, the average droplet diameter remains below a limit, preferably not exceeding 100 microns to Sauter.
- the moistening devices In coordination with the quantity of liquid to be applied, the droplet size and the type of parameter to be influenced, the moistening devices should in turn have different nozzle types and / or different spray angles with respect to the fibrous web.
- the number of zones of a humidifier should be selected. In particular, for influencing the curl one or a few zones suffice.
- the zones of the moistening devices have different widths.
- the moisture profiles to be expected depend, in addition to the type of fibrous web, i. the basis weight, the thickness, the width also on the type of dryer section.
- the number of zones should be limited to the degree required in each case. As a result, the humidifiers have a different number of zones.
- a low-zone moistening device for example for influencing the curling tendency of the fibrous web, between 1 and 25 zones are often sufficient.
- the multi-zone humidifiers have zones with a width between 20 and 150 mm, preferably between 20 and 50 mm.
- the first moistening device in the web running direction should be arranged in a region of the dryer section in which the dry content of the fibrous web is at least 60% but at least 2% below the dry content at the end of the fibrous web the drying section has.
- the last moistening device in the web running direction should be in an area of the dryer section be arranged in which the dry content of the fibrous web is at least 80%.
- the fibrous web is guided between the drying cylinders of a drying group of the drying section via evacuated guide rolls, the drying wire lying between the guide roll and the fibrous web.
- at least one, preferably all moistening devices are arranged in the region of an evacuated guide roller.
- the first moistening device in the web running direction is used essentially, preferably exclusively for correcting the moisture transverse profile of the fibrous web and adjusted accordingly.
- the last moistening device in the web running direction allows the last moistening device in the web running direction to be used essentially, preferably exclusively for correcting the curl of the fibrous web and adjusted accordingly. Because of the improved correction options in this area of the dryer section, in particular with regard to the moisture cross profile, the first moistening device in the web running direction should have more zones than the last one Moistening.
- the last moistening device in the web running direction should have more zones than the first moistening device in order to better influence the parameters of the fibrous web.
- humidifiers in dryer sections which lead to increased curl of the fibrous web.
- dryer sections which lead to increased curl of the fibrous web.
- These include drying sections in which only one side of the fibrous web comes into contact with the drying cylinders in all dryer groups and dryer sections where in the, preferably one or two last drying groups of the dryer section both sides and before at least predominantly only one side of the fibrous web with the drying cylinders comes into contact.
- the arrangement of humidifiers in such dryer sections is also relatively unproblematic.
- humidifiers are also advantageous in multi-ply fibrous webs or fibrous webs, which are treated on one side with the surface properties influencing substances.
- the fibrous web 1 passes through for dewatering together with a press felt formed by two press rolls press nip 9. Subsequently enters the fibrous web 1 in the dryer section, in which the fibrous web 1 is heated by the direct contact with heated drying cylinders 2 and dried.
- the drying sections consist of several drying groups, each drying group being formed by one or two rows of drying cylinders 2 arranged one above the other.
- each drying cylinder 3 is assigned to each row of drying cylinders 2 for supporting the fibrous web 1.
- Drying takes place on one side at least in the first part of the dryer section, since only the lower side of the fibrous web 1 comes into contact with the drying cylinders 2 arranged in a row here. Between the drying cylinders 2, the fibrous web 1, together with the corresponding drying wire 3, wraps around an evacuated guide roll 4, wherein the drying wire 3 lies between the guide roll 4 and the fibrous web 1.
- the evacuated guide rolls 4 have a perforated roll shell whose interior is connected to a vacuum source.
- the negative pressure ensures that the fibrous web 1 is sucked during the wrapping of the guide roller 4 for drying wire 3 out.
- moistening 5.6 located in the dryer section two moistening 5.6 in the form of transverse to the web direction 10 nozzle moisteners having a plurality of transversely to the web running direction 10 juxtaposed pneumatic atomizer nozzles.
- These moistening devices 5, 6 are arranged opposite to the fibrous web 1 and with respect to the amount of liquid applied to the fibrous web 1 in zones transversely to the web running direction 10 separately controllable.
- the adjustment of the degree of emanating from the zones humidification is carried out in dependence on the measured moisture profile of the fibrous web 1 in the form of a scheme.
- a second moistening device 6 is assigned to the last evacuated guide roller 4. This has only one zone here.
- the dry content of the fibrous web is more than 80%.
- Each of the first 4 drying groups consists of a row of drying cylinders 2 and the last two are each made up of two rows arranged one above the other.
- a first moistening device 5 in the web running direction 10 is possible in the looped area of an evacuated guide roll 4, since there is a sufficiently large dry content of more than 60%.
- this moistening device 5 serves to correct the moisture transverse profile of the fibrous web 1.
- a second moistening device 6 can be attached to a suctioned guide roller 4.
- the dry content of the fibrous web 1 is more than 80%.
- This moistening device 6 is used to correct the moisture cross profile and to influence the curl of the fibrous web 1 and therefore has more zones than the first moistening device 5.
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- Paper (AREA)
- Treatment Of Fiber Materials (AREA)
- Drying Of Solid Materials (AREA)
Description
Die Erfindung betrifft eine Trockenpartie zur Trocknung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn in einer Maschine zur Herstellung und/oder Veredlung der Faserstoffbahn, in der die Faserstoffbahn von zumindest einem Trockensieb gestützt über mehrere beheizte Trockenzylinder und Leitwalzen geführt wird.The invention relates to a drying section for drying a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the fibrous web, in which the fibrous web is guided by at least one drying wire supported over a plurality of heated drying cylinders and guide rolls.
Derartige Trockenpartien sind seit langem in vielfältiger Form im Einsatz. Dabei kommt es oft zum Aufbau von Spannungen in der Faserstoffbahn, die zu einer verstärkten Rollneigung führen. Außerdem ist das Feuchtquerprofil der Faserstoffbahn im allgemeinen nicht befriedigend, da es insbesondere an den Rändern zur Übertrocknung kommt.Such dryer sections have long been in various forms in use. This often leads to the buildup of tension in the fibrous web, which leads to an increased tendency to curl. In addition, the wet transverse profile of the fibrous web is generally not satisfactory, since it comes especially at the edges to over-drying.
Bisher wurde dem mit voneinander getrennten Vorrichtungen begegnet, einem Düsenfeuchter zur Beeinflussung des Feuchteprofils meist in der Trockenpartie und einem Dampffeuchter zur Beeinflussung der Rollneigung im allgemeinen nach der Trockenpartie angeordnet. Befeuchtungseinrichtungen in Kalandern sind aus den Druckschriften
Die Aufgabe der Erfindung ist es mit einfachen Mitteln das Feuchtequerprofil sowie die Rollneigung der Faserstoffbahn zu verbessern.The object of the invention is to improve the moisture profile and the curl tendency of the fibrous web by simple means.
Diese Aufgabe wird durch die Trockenpartie nach Anspruch 1 gelöst.This object is achieved by the dryer section according to claim 1.
Erfindungsgemäß sind innerhalb der Trockenpartie mehrere, vorzugsweise zwei Befeuchtungseinrichtungen an unterschiedlichen Positionen gegenüber der Faserstoffbahn angeordnet, wobei zumindest bei einer Befeuchtungseinrichtung die, auf die Faserstoffbahn aufgebrachte Flüssigkeitsmenge in Zonen quer zur Bahnlaufrichtung separat einstellbar ist.According to the invention, several, preferably two, moistening devices are arranged at different positions relative to the fibrous web within the dryer section, wherein the amount of liquid applied to the fibrous web is separately adjustable in zones transverse to the web running direction, at least in the case of a moistening device.
Der Einsatz von mehreren Befeuchtungseinrichtungen erlaubt es einerseits mehrfach während des Trocknungsprozesses auf das Feuchtequerprofil, die Planlage und gegebenenfalls auch die Rollneigung Einfluss zu nehmen und andererseits zumindest einzelne Parameter der Faserstoffbahn wie das Feuchtquerprofil oder die Rollneigung separat über zumindest eine Befeuchtungseinrichtung zu beeinflussen.The use of several moistening devices makes it possible, on the one hand, to influence the moisture transverse profile, the flatness and optionally also the tendency to curl several times during the drying process and, on the other hand, at least to influence individual parameters of the fibrous web, such as the wet transverse profile or the curl, separately via at least one moistening device.
Dabei wurde erkannt, dass diese Parameter sich während des Trocknungsprozesses noch relativ einfach ändern lassen, die unabhängige Beeinflussung der Parameter das Korrekturspektrum wesentlich erweitert und eine wiederholte Beeinflussung eines Parameter zu verbesserten Ergebnissen führt.It was recognized that these parameters can still be changed relatively easily during the drying process, that the independent influencing of the parameters substantially extends the correction spectrum and that a repeated influencing of a parameter leads to improved results.
Zumindest eine, vorzugsweise alle Befeuchtungseinrichtungen besitzen mehrere, quer zur Bahnlaufrichtung nebeneinander angeordnete Düsen. Dabei ist es vorteilhaft, wenn die Düsen zumindest teilweise als pneumatische Zerstäuberdüsen ausgebildet sind.At least one, preferably all moistening devices have a plurality of nozzles arranged transversely to the web running direction. It is advantageous if the nozzles are at least partially formed as pneumatic atomizer nozzles.
Entsprechend der Art, dem Feuchtegehalt und dem zu beeinflussenden Parameter der Faserstoffbahn ist es von Vorteil, wenn die Befeuchtungseinrichtungen insgesamt unterschiedliche Flüssigkeitsmengen auf die Faserstoffbahn aufbringen.According to the type, the moisture content and the parameters of the fibrous web to be influenced, it is advantageous if the moistening devices apply a total of different amounts of liquid to the fibrous web.
In Abhängigkeit von der aufzubringenden Flüssigkeitsmenge, dem Feuchtegehalt sowie der Art der Faserstoffbahn ist es ebenso vorteilhaft, wenn die Befeuchtungseinrichtungen die Flüssigkeit mit unterschiedlicher Tröpfchengröße abgeben, wobei der mittlere Tröpfchendurchmesser unterhalb eines Grenzwertes bleibt, der vorzugsweise 100 µm nach Sauter nicht überschreitet.Depending on the amount of liquid to be applied, the moisture content and the nature of the fibrous web, it is also advantageous if the moistening provide the liquid with different droplet size, the average droplet diameter remains below a limit, preferably not exceeding 100 microns to Sauter.
In Abstimmung mit der aufzubringenden Flüssigkeitsmenge, der Tröpfchengröße sowie der Art des zu beeinflussenden Parameters sollten die Befeuchtungseinrichtungen wiederum unterschiedliche Düsentypen und/oder verschiedene Sprühwinkel bezüglich der Faserstoffbahn aufweisen.In coordination with the quantity of liquid to be applied, the droplet size and the type of parameter to be influenced, the moistening devices should in turn have different nozzle types and / or different spray angles with respect to the fibrous web.
Je nach dem zu beeinflussenden Parameter sollte die Anzahl der Zonen einer Befeuchtungseinrichtung gewählt werden. Insbesondere für die Beeinflussung der Rollneigung genügen eine oder wenige Zonen.Depending on the parameter to be influenced, the number of zones of a humidifier should be selected. In particular, for influencing the curl one or a few zones suffice.
Zur Anpassung an die charakteristischen Erfordernisse der Faserstoffbahn ist es von Vorteil, wenn die Zonen der Befeuchtungseinrichtungen unterschiedlich breit sind.To adapt to the characteristic requirements of the fibrous web, it is advantageous if the zones of the moistening devices have different widths.
Die zu erwartenden Feuchtequerprofile hängen neben der Art der Faserstoffbahn, d.h. dem Flächengewicht, der Dicke, der Breite auch von der Art der Trockenpartie ab.The moisture profiles to be expected depend, in addition to the type of fibrous web, i. the basis weight, the thickness, the width also on the type of dryer section.
Um die Anzahl der Zonen aus Kostengründen zu begrenzen, kann daher die Unterteilung der Zonen entsprechend dem zu erwartenden Feuchtequerprofil und/oder der erforderlichen Rollneigungskorrektur gewählt werden.In order to limit the number of zones for cost reasons, it is therefore possible to select the subdivision of the zones according to the moisture profile to be expected and / or the required curl correction.
Insbesondere wenn die Befeuchtungseinrichtungen verschiedene Parameter beeinflussen, sollte die Anzahl der Zonen auf das jeweils dafür nötige Maß beschränkt werden. Im Ergebnis besitzen die Befeuchtungseinrichtungen eine unterschiedliche Anzahl von Zonen.In particular, if the humidifiers affect various parameters, the number of zones should be limited to the degree required in each case. As a result, the humidifiers have a different number of zones.
Für eine niedrigzonige Befeuchtungseinrichtung, beispielsweise zur Beeinflussung der Rollneigung der Faserstoffbahn genügen häufig bereits zwischen 1 und 25 Zonen.For a low-zone moistening device, for example for influencing the curling tendency of the fibrous web, between 1 and 25 zones are often sufficient.
Im Gegensatz dazu haben die vielzonigen Befeuchtungseinrichtungen Zonen mit einer Breite zwischen 20 und 150 mm, vorzugsweise zwischen 20 und 50 mm.In contrast, the multi-zone humidifiers have zones with a width between 20 and 150 mm, preferably between 20 and 50 mm.
Um die maximal mögliche Sprühmenge zur Feuchtequerprofilkorrektur effektiv zu nutzen, sollte die in Bahnlaufrichtung erste Befeuchtungseinrichtung in einem Bereich der Trockenpartie angeordnet sein, in dem der Trockengehalt der Faserstoffbahn mindestens 60 % beträgt, aber zumindest 2 % unter dem Trockengehalt liegt, den die Faserstoffbahn am Ende der Trockenpartie aufweist.In order to effectively use the maximum possible spray quantity for moisture profile correction, the first moistening device in the web running direction should be arranged in a region of the dryer section in which the dry content of the fibrous web is at least 60% but at least 2% below the dry content at the end of the fibrous web the drying section has.
Die in Bahnlaufrichtung letzte Befeuchtungseinrichtung sollte, um die Rollneigung ausreichend beeinflussen zu können, dagegen in einem Bereich der Trockenpartie angeordnet sein, in dem der Trockengehalt der Faserstoffbahn mindestens 80 % beträgt.On the other hand, in order to be able to influence the curling tendency, the last moistening device in the web running direction should be in an area of the dryer section be arranged in which the dry content of the fibrous web is at least 80%.
Wegen der verstärkten Rollneigung der Faserstoffbahn ist der Einsatz der Befeuchtungseinrichtungen in Trockengruppen der Trockenpartie vorteilhaft, in denen nur eine Seite der Faserstoffbahn mit den Trockenzylindern in Kontakt kommt.Because of the increased curl of the fibrous web, it is advantageous to use the moistening devices in dryer sections of the dryer section, in which only one side of the fibrous web comes into contact with the drying cylinders.
Erfindungsgemäß wird die Faserstoffbahn zwischen den Trockenzylindern einer Trockengruppe der Trockenpartie über besaugte Leitwalzen geführt, wobei das Trockensieb zwischen Leitwalze und Faserstoffbahn liegt. Dabei wird zumindest eine, vorzugsweise alle Befeuchtungseinrichtungen im Bereich einer besaugten Leitwalze angeordnet.According to the invention, the fibrous web is guided between the drying cylinders of a drying group of the drying section via evacuated guide rolls, the drying wire lying between the guide roll and the fibrous web. In this case, at least one, preferably all moistening devices are arranged in the region of an evacuated guide roller.
In Verbindung mit den erforderlichen Trockengehalten der Faserstoffbahn ist es häufig von Vorteil, wenn die in Bahnlaufrichtung letzte Befeuchtungseinrichtung im Bereich der letzten besaugten Leitwalze der Trockenpartie und die in Bahnlaufrichtung erste Befeuchtungseinrichtung im Bereich der letzten besaugten Leitwalze der vorletzten Trockengruppe der Trockenpartie angeordnet ist.In connection with the required dry contents of the fibrous web, it is often advantageous if the last in the web running direction moistening in the last evacuated guide roller of the dryer section and the first moistening device in the web running direction in the last evacuated guide roller of the penultimate drying group of the dryer section is arranged.
Zur Gewährleistung der erforderlichen Korrekturgenauigkeit ist es von vorteilhaft, wenn die in Bahnlaufrichtung erste Befeuchtungseinrichtung im wesentlichen, vorzugsweise ausschließlich zur Korrektur des Feuchtequerprofils der Faserstoffbahn verwendet und entsprechend eingestellt wird.To ensure the required accuracy of correction, it is advantageous if the first moistening device in the web running direction is used essentially, preferably exclusively for correcting the moisture transverse profile of the fibrous web and adjusted accordingly.
Dies wiederum erlaubt es, dass die in Bahnlaufrichtung letzte Befeuchtungseinrichtung im wesentlichen, vorzugsweise ausschließlich zur Korrektur der Rollneigung der Faserstoffbahn verwendet und entsprechend eingestellt wird. Wegen der verbesserten Korrekturmöglichkeiten in diesem Bereich der Trockenpartie, insbesondere bezüglich des Feuchtequerprofils sollte die in Bahnlaufrichtung erste Befeuchtungseinrichtung mehr Zonen besitzt als die letzte Befeuchtungseinrichtung.This, in turn, allows the last moistening device in the web running direction to be used essentially, preferably exclusively for correcting the curl of the fibrous web and adjusted accordingly. Because of the improved correction options in this area of the dryer section, in particular with regard to the moisture cross profile, the first moistening device in the web running direction should have more zones than the last one Moistening.
Es ist jedoch auch möglich, dass in Bahnlaufrichtung letzte Befeuchtungseinrichtung zur Korrektur des Feuchtequerprofils und der Rollneigung der Faserstoffbahn verwendet und entsprechend eingestellt wird. Insbesondere in diesem Fall sollte die in Bahnlaufrichtung letzte Befeuchtungseinrichtung zur besseren Beeinflussung der Parameter der Faserstoffbahn mehr Zonen als die erste Befeuchtungseinrichtung aufweisen.However, it is also possible that used in the web running direction last moistening device for correcting the moisture profile and the curl of the fibrous web and adjusted accordingly. Particularly in this case, the last moistening device in the web running direction should have more zones than the first moistening device in order to better influence the parameters of the fibrous web.
Besonders geeignet ist der Einsatz der Befeuchtungseinrichtungen in Trockenpartien, die zu erhöhter Rollneigung der Faserstoffbahn führen. Dazu zählen Trockenpartien bei denen in allen Trockengruppen jeweils nur eine Seite der Faserstoffbahn mit den Trockenzylindern in Kontakt kommt und Trockenpartien bei denen in den, vorzugsweise ein oder zwei letzten Trockengruppen der Trockenpartie beide Seiten und davor zumindest überwiegend nur jeweils eine Seite der Faserstoffbahn mit den Trockenzylindern in Kontakt kommt. Außerdem ist die Anordnung der Befeuchtungseinrichtungen in derartigen Trockenpartien auch relativ unproblematisch.Particularly suitable is the use of humidifiers in dryer sections, which lead to increased curl of the fibrous web. These include drying sections in which only one side of the fibrous web comes into contact with the drying cylinders in all dryer groups and dryer sections where in the, preferably one or two last drying groups of the dryer section both sides and before at least predominantly only one side of the fibrous web with the drying cylinders comes into contact. In addition, the arrangement of humidifiers in such dryer sections is also relatively unproblematic.
Der Einsatz der Befeuchtungseinrichtungen ist aber auch von Vorteil bei mehrlagigen Faserstoffbahnen oder Faserstoffbahnen, die auf einer Seite mit die Oberflächeneigenschaften beeinflussenden Stoffen behandelt sind.However, the use of humidifiers is also advantageous in multi-ply fibrous webs or fibrous webs, which are treated on one side with the surface properties influencing substances.
Nachfolgend soll die Erfindung an zwei Ausführungsbeispielen näher erläutert werden. In der beigefügten Zeichnung zeigt:
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Figur 1 : eine Trockenpartie mit einreihigen Trockengruppen und -
Figur 2 : eine Trockenpartie mit einer zweireihigen Schlussgruppe.
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FIG. 1 : a drying section with single-tier dryer groups and -
FIG. 2 : a drying section with a double-row final group.
In beiden Fällen durchläuft die Faserstoffbahn 1 zur Entwässerung gemeinsam mit einem Pressfilz einen von zwei Presswalzen gebildeten Pressspalt 9. Anschließend gelangt die Faserstoffbahn 1 in die Trockenpartie, in der die Faserstoffbahn 1 durch den direkten Kontakt mit beheizten Trockenzylindern 2 erwärmt und getrocknet wird.In both cases, the fibrous web 1 passes through for dewatering together with a press felt formed by two press
Die Trockenpartien bestehen aus mehreren Trockengruppen, wobei jede Trockengruppe von einer oder zwei übereinander angeordneten Reihen von Trockenzylindern 2 gebildet wird. Dabei ist jeder Reihe von Trockenzylindern 2 jeweils ein Trockensieb 3 zur Stützung der Faserstoffbahn 1 zugeordnet.The drying sections consist of several drying groups, each drying group being formed by one or two rows of
Zumindest im ersten Teil der Trockenpartie erfolgt die Trocknung einseitig, da hier nur die Unterseite der Faserstoffbahn 1 mit den in einer Reihe angeordneten Trockenzylindern 2 in Kontakt kommt. Zwischen den Trockenzylindern 2 umschlingt die Faserstoffbahn 1 gemeinsam mit dem entsprechenden Trockensieb 3 jeweils eine besaugte Leitwalze 4, wobei das Trockensieb 3 zwischen Leitwalze 4 und Faserstoffbahn 1 liegt.Drying takes place on one side at least in the first part of the dryer section, since only the lower side of the fibrous web 1 comes into contact with the
Die besaugten Leitwalzen 4 besitzen einen perforierten Walzenmantel, dessen Innenraum mit einer Unterdruckquelle verbunden ist. Der Unterdruck sorgt dabei dafür, dass die Faserstoffbahn 1 während der Umschlingung der Leitwalze 4 zum Trockensieb 3 hin gesaugt wird.The evacuated guide rolls 4 have a perforated roll shell whose interior is connected to a vacuum source. The negative pressure ensures that the fibrous web 1 is sucked during the wrapping of the guide roller 4 for drying
Diese Trockengruppen sind relativ einfach aufgebaut und ermöglichen eine unproblematische Ausschussabfuhr in den Maschinenkeller. Wegen der einseitigen Trocknung ist die Rollneigung der Faserstoffbahn 1 jedoch besonders stark ausgeprägt.These dryer groups are of relatively simple construction and enable unproblematic reject discharge into the machine cellar. Because of the one-sided drying, however, the curl of the fibrous web 1 is particularly pronounced.
Daher befinden sich in der Trockenpartie zwei Befeuchtungseinrichtungen 5,6 in Form von quer zur Bahnlaufrichtung 10 verlaufenden Düsenfeuchtern, die mehrere quer zur Bahnlaufrichtung 10 nebeneinander angeordnete, pneumatische Zerstäuberdüsen besitzen. Diese Befeuchtungseinrichtungen 5,6 sind gegenüber der Faserstoffbahn 1 angeordnet und bezüglich der, auf die Faserstoffbahn 1 aufgebrachten Flüssigkeitsmenge in Zonen quer zur Bahnlaufrichtung 10 separat steuerbar.Therefore, located in the dryer section two moistening 5.6 in the form of transverse to the
In
Die Einstellung des Grades der von den Zonen ausgehenden Befeuchtung erfolgt in Abhängigkeit vom gemessenen Feuchtequerprofil der Faserstoffbahn 1 in Form einer Regelung.The adjustment of the degree of emanating from the zones humidification is carried out in dependence on the measured moisture profile of the fibrous web 1 in the form of a scheme.
Zur Beeinflussung der Rollneigung ist der letzten besaugten Leitwalze 4 eine zweite Befeuchtungseinrichtung 6 zugeordnet. Diese besitzt hier nur eine Zone. Der Trockengehalt der Faserstoffbahn liegt dabei über 80 %.To influence the tendency to curl, a second moistening device 6 is assigned to the last evacuated guide roller 4. This has only one zone here. The dry content of the fibrous web is more than 80%.
Bei der Trockenpartie gemäß
Dabei ist in dem mittleren Bereich 7 des einreihigen Teils der Trockenpartie die Anordnung einer in Bahnlaufrichtung 10 ersten Befeuchtungseinrichtung 5 im Umschlingungsbereich einer besaugten Leitwalze 4 möglich, da dort ein ausreichend großer Trockengehalt von über 60 % vorhanden ist. Auch hier dient diese Befeuchtungseinrichtung 5 zur Korrektur des Feuchtequerprofils der Faserstoffbahn 1.In the
Im Endbereich 8 des einreihigen Teils der Trockenoartie ist eine zweite Befeuchtungseinrichtung 6 gegenüber einer besaugten Leitwalze 4 anbringbar. Dabei liegt der Trockengehalt der Faserstoffbahn 1 über 80 %. Diese Befeuchtungseinrichtung 6 dient der Korrektur des Feuchtquerprofils sowie der Beeinflussung der Rollneigung der Faserstoffbahn 1 und besitzt daher mehr Zonen als die erste Befeuchtungseinrichtung 5.In the
Zur Befeuchtung wird im allgemeinen Wasser verwendet, wobei die Tröpfchengröße sowie der Sprühwinkel bezüglich der Faserstoffbahn 1 an die Gegebenheiten angepasst werden sollten.For moistening water is generally used, wherein the droplet size and the spray angle with respect to the fibrous web 1 should be adapted to the circumstances.
Claims (21)
- Dryer section for drying a paper, board, tissue or another fibrous web (1) in a machine for producing and/or finishing the fibrous web (1), wherein the dryer section consists of a plurality of drying groups, in which in each case the fibrous web (1), supported by at least one drying fabric (3), is led over a plurality of heated drying cylinders (2), wherein, within the dryer section, a plurality of moisturizing devices (5, 6), preferably two moisturizing devices (5, 6), are arranged at different positions with respect to the fibrous web (1), at least one, preferably all of the moisturizing devices (5, 6) having a plurality of nozzles arranged beside one another transversely with respect to the web running direction (10), the quantity of liquid applied to the fibrous web (1), at least in one moisturizing device (5, 6), being adjustable separately in zones transversely with respect to the web running direction (10), characterized in that the fibrous web (1) is led between the drying cylinders (2) of a drying group of the dryer section over evacuated guide rolls (4), the drying fabric (3) being located between guide roll (4) and fibrous web (1), in that at least one, preferably all, of the moisturizing devices (5, 6) is/are arranged in the region of an evacuated guide roll (4), and in that the moisturizing devices (5, 6) have a different number of zones.
- Dryer section according to Claim 1, characterized in that the nozzles are at least partly formed as pneumatic atomizer nozzles.
- Dryer section according to one of the preceding claims, characterized in that the moisturizing devices (5, 6) each apply different quantities of liquid to the fibrous web (1).
- Dryer section according to one of the preceding claims, characterized in that the moisturizing devices (5, 6) discharge the liquid with various mean droplet diameters in each case, the mean droplet diameter according to Sauter not exceeding an upper limit of preferably 100 µm.
- Dryer section according to one of the preceding claims, characterized in that the moisturizing devices (5, 6) have different nozzle types and/or various spray angles with respect to the fibrous web (1).
- Dryer section according to one of the preceding claims, characterized in that the zones of the moisturizing devices (5, 6) have different widths.
- Dryer section according to one of Claims 1 to 6, characterized in that the few-zone moisturizing device (5, 6) has between 1 and 25 zones.
- Dryer section according to one of Claims 1 to 7, characterized in that the many-zone moisturizing device (5, 6) has zones with a width between 20 and 150 mm, preferably between 20 and 50 mm.
- Dryer section according to one of the preceding claims, characterized in that the first moisturizing device (5) in the web running direction (10) is arranged in a region of the dryer section in which the dryness of the fibrous web (1) is at least 60% but lies at least 2% below the dryness which the fibrous web (1) has at the end of the dryer section.
- Dryer section according to one of the preceding claims, characterized in that the last moisturizing device (6) in the web running direction (10) is arranged in a region of the dryer section in which the dryness of the fibrous web (1) is at least 80%.
- Dryer section according to one of the preceding claims, characterized in that the moisturizing devices (5, 6) are used in drying groups of the dryer section in which only one side of the fibrous web (1) comes into contact with the drying cylinders (2).
- Dryer section according to one of Claims 1 to 11, characterized in that the last moisturizing device (6) in the web running direction (10) is arranged in the region of the last evacuated guide roll (4) of the dryer section.
- Dryer section according to one of Claims 1 to 12, characterized in that the first moisturizing device (5) in the web running direction (10) is arranged in the region of the last evacuated guide roll (4) of the penultimate drying group of the dryer section.
- Dryer section according to one of the preceding claims, characterized in that the first moisturizing device (5) in the web running direction (10) is used substantially, preferably exclusively, for correcting the cross-machine moisture profile of the fibrous web (1) and is adjusted appropriately.
- Dryer section according to one of the preceding claims, characterized in that the last moisturizing device (6) in the web running direction (10) is used substantially, preferably exclusively, for correcting the tendency of the fibrous web (1) to curl and is adjusted appropriately.
- Dryer section according to one of the preceding claims, characterized in that the first moisturizing device (5) in the web running direction (10) has more zones than the last moisturizing device (6).
- Dryer section according to one of Claims 1 to 14, characterized in that the last moisturizing device (6) in the web running direction (10) is used for correcting the cross-machine moisture profile and the tendency of the fibrous web (1) to curl and is adjusted appropriately.
- Dryer section according to Claim 17, characterized in that the last moisturizing device (6) in the web running direction (10) has more zones than the first moisturizing device (5).
- Dryer section according to one of the preceding claims, characterized in that, in all the drying groups of the dryer section, in each case only one side of the fibrous web (1) comes into contact with the drying cylinders (2).
- Dryer section according to one of Claims 1 to 18, characterized in that, in the preferably one or two last drying groups of the dryer section, both sides and, before this, in each case only one side of the fibrous web (1) comes into contact with the drying cylinders (2).
- Use of the dryer section according to one of the preceding claims in multilayer fibrous webs (1) or fibrous webs (1) which are treated on one side with substances influencing the surface properties.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10233795 | 2002-07-25 | ||
| DE10233795A DE10233795A1 (en) | 2002-07-25 | 2002-07-25 | drying section |
| PCT/EP2003/050291 WO2004011722A1 (en) | 2002-07-25 | 2003-07-08 | Dryer section |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1527232A1 EP1527232A1 (en) | 2005-05-04 |
| EP1527232B1 true EP1527232B1 (en) | 2017-03-22 |
Family
ID=30128360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03771111.6A Expired - Lifetime EP1527232B1 (en) | 2002-07-25 | 2003-07-08 | Dryer section |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US7459062B2 (en) |
| EP (1) | EP1527232B1 (en) |
| JP (1) | JP4528618B2 (en) |
| CN (1) | CN100352999C (en) |
| AU (1) | AU2003254501A1 (en) |
| DE (1) | DE10233795A1 (en) |
| WO (1) | WO2004011722A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004017809A1 (en) * | 2004-04-13 | 2005-10-27 | Voith Paper Patent Gmbh | dry arrangement |
| DE102008000288A1 (en) | 2008-02-13 | 2009-08-20 | Voith Patent Gmbh | Method and device for controlling and / or regulating the moisture of a material web and machine for producing a material web with such a device |
| US9481777B2 (en) | 2012-03-30 | 2016-11-01 | The Procter & Gamble Company | Method of dewatering in a continuous high internal phase emulsion foam forming process |
| US9670616B2 (en) | 2014-12-11 | 2017-06-06 | Georgia-Pacific Consumer Products Lp | Active web spreading and stabilization shower |
| DE102021103519A1 (en) * | 2021-02-15 | 2022-08-18 | Koehler Innovation & Technology Gmbh | Process for the production of a fibrous web |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE429771B (en) * | 1978-09-25 | 1983-09-26 | Nordiskafilt Ab | SET TO ADJUST THE MOISTURE PROFILE OF A FIBER COVER |
| FI72552C (en) * | 1984-02-08 | 1987-06-08 | Waertsilae Oy Ab | FOERFARANDE OCH ANORDNING FOER BEHANDLING AV BANA. |
| US5065673A (en) * | 1989-09-19 | 1991-11-19 | Measurex Corporation | Cross-directional moisture control system and method |
| FI91900C (en) * | 1990-12-17 | 1994-08-25 | Valmet Paper Machinery Inc | Process at the drying portion of a paper machine to reduce the curvature tendency and drying portion of the paper intended to carry out the procedure |
| FI103820B1 (en) * | 1993-11-30 | 1999-09-30 | Valmet Paper Machinery Inc | Procedures for drying a paper web and drying parts for paper machine |
| US5632101A (en) * | 1994-09-16 | 1997-05-27 | Voith Sulzer Papiermaschinen Gmbh | All top-felted single-tier drying section with post drying section curl control |
| DE9414963U1 (en) * | 1994-09-16 | 1994-11-03 | J.M. Voith Gmbh, 89522 Heidenheim | Dryer section |
| US5771603A (en) * | 1994-09-16 | 1998-06-30 | Voith Sulzer Papiermashinen Gmbh | Dryer section |
| US5592751A (en) * | 1994-11-23 | 1997-01-14 | Voith Sulzer Papiermaschinen Gmbh | Dryer section having combination of single and double tier dryer groups |
| DE19627669C2 (en) * | 1996-07-10 | 2001-03-01 | Stora Enso Publication Paper A | Process for improving printing paper |
| US6001421A (en) * | 1996-12-03 | 1999-12-14 | Valmet Corporation | Method for drying paper and a dry end of a paper machine |
| FI981594A (en) | 1998-07-10 | 2000-01-11 | Valmet Corp | Method and apparatus for wetting web |
| DE69915836T2 (en) | 1998-07-10 | 2005-04-21 | Metso Paper Inc | METHOD AND DEVICE FOR PRODUCING SURFACED PRINTED PAPER |
| ES2217781T3 (en) | 1998-07-10 | 2004-11-01 | Metso Paper, Inc. | METHOD OF MANUFACTURE OF CALANDRATED PAPER. |
| DE19901400A1 (en) * | 1999-01-15 | 2000-07-20 | Voith Sulzer Papiertech Patent | Drying and smoothing unit for fibrous webs |
| DE19921592A1 (en) | 1999-05-07 | 2000-11-09 | Voith Sulzer Papiertech Patent | Application device and method for a paper machine |
| DE10052187B4 (en) | 2000-10-20 | 2013-12-24 | Voith Patent Gmbh | Method for smoothing a material web and calender for carrying out the method |
| FI109213B (en) * | 2000-11-24 | 2002-06-14 | Metso Paper Inc | Method and apparatus for controlling the profile of the moisture content or coating amount of the paper web |
| US6699365B2 (en) * | 2001-10-22 | 2004-03-02 | Abb Inc. | Method of wetting webs of paper or other hygroscopic material |
-
2002
- 2002-07-25 DE DE10233795A patent/DE10233795A1/en not_active Withdrawn
-
2003
- 2003-07-08 EP EP03771111.6A patent/EP1527232B1/en not_active Expired - Lifetime
- 2003-07-08 JP JP2004523808A patent/JP4528618B2/en not_active Expired - Fee Related
- 2003-07-08 AU AU2003254501A patent/AU2003254501A1/en not_active Abandoned
- 2003-07-08 WO PCT/EP2003/050291 patent/WO2004011722A1/en active Application Filing
- 2003-07-08 CN CNB038178869A patent/CN100352999C/en not_active Expired - Lifetime
-
2005
- 2005-01-24 US US11/040,032 patent/US7459062B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| None * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20050138837A1 (en) | 2005-06-30 |
| JP2005533938A (en) | 2005-11-10 |
| EP1527232A1 (en) | 2005-05-04 |
| CN100352999C (en) | 2007-12-05 |
| WO2004011722A1 (en) | 2004-02-05 |
| DE10233795A1 (en) | 2004-02-12 |
| AU2003254501A1 (en) | 2004-02-16 |
| US7459062B2 (en) | 2008-12-02 |
| CN1671922A (en) | 2005-09-21 |
| JP4528618B2 (en) | 2010-08-18 |
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