EP1540078B1 - Device and method for producing and/or treating a fibrous strip - Google Patents

Device and method for producing and/or treating a fibrous strip Download PDF

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Publication number
EP1540078B1
EP1540078B1 EP03795022A EP03795022A EP1540078B1 EP 1540078 B1 EP1540078 B1 EP 1540078B1 EP 03795022 A EP03795022 A EP 03795022A EP 03795022 A EP03795022 A EP 03795022A EP 1540078 B1 EP1540078 B1 EP 1540078B1
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EP
European Patent Office
Prior art keywords
curl
influence
nozzles
equipment according
nozzle
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EP03795022A
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German (de)
French (fr)
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EP1540078A1 (en
Inventor
Roland Mayer
Antje Stein
Markus Oechsle
Frank Wegehaupt
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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
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • 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

Definitions

  • the invention relates to a device and a method for producing and / or treating a fibrous web, in particular paper or board web.
  • curl For influencing curl (curl) of paper webs, for example, water is applied evenly over the web width by means of nozzles. It is essential that the water is applied to one side or at least in different amounts on the two sides in a bidirectional admission. Thus, the swelling change of the fibers between the top and the bottom of the web during the drying process is specifically influenced and corrected accordingly the curl behavior.
  • the water can be applied via nozzles or special roller applicators.
  • nozzles or special roller applicators In the case of high-quality papers in particular, attention must be paid to the best possible moisture cross-section. This is achieved by sectionally controllable nozzle dampers.
  • the maximum application amount per nozzle is in a range of 12 to 15 l / h with a droplet diameter Sauter ⁇ 100 microns.
  • the so-called Sauter diameter is an average diameter used for spray characterization. A drop of this diameter has the same volume to surface ratio as the total (spray) sample, ie the sum of all surfaces and volumes.
  • the correction of the curl i. the flatness of the paper by a two-row arrangement of the drying cylinder at least at the end of the dryer section or a steam application on the paper underside after the dryer section and / or an additional application of water to the paper web bottom.
  • the invention has for its object to provide an improved device and an improved method of the type mentioned, in which the aforementioned disadvantages are eliminated.
  • From the EP 0 742 313 A2 also shows a drying section for a paper machine. This has an over the Textilbahriumble extending moistening device, which is arranged after the drying section and in front of a calender.
  • the WO 00/00696 A1 shows various devices for moistening a paper web passing through a drying group of a paper machine, for example by moistening rollers or moistening felts.
  • moisture transverse profile, flatness two requirements or functions (moisture transverse profile, flatness) are united or realized in a single aggregate. It is thus possible, for example, a leveling of the moisture profile of the fibrous web with simultaneous minimum remindbefeuchtung the web over the entire width to ensure the flatness of the fibrous web. Reliable moisture cross profile control and flatness correction is still possible at higher machine speeds, i. with a short residence time of the web in the area of the moistening unit, ensured.
  • the device according to the invention is particularly suitable for papers of high basis weight.
  • the moistening unit comprises a nozzle moistener which simultaneously serves both to influence the moisture transverse profile and to influence the curl of the fibrous web.
  • the nozzle moistener may be provided with pneumatic atomizing nozzles.
  • the nozzle moistener is provided with dual-substance nozzles. These may for example have such a structure, as shown in the DE 199 49 236 A is described. It can therefore be used in particular with a gaseous medium and a liquid medium acted upon two-component spray nozzles.
  • the average throughput of the nozzles of the nozzle moisturizer is preferably ⁇ 15 l / h.
  • the average throughput of the nozzles of the nozzle moisturizer can be in particular in a range of 15 l / h to 30 l / h and preferably in a range of 15 l / h to 20 l / h.
  • the average throughput of all nozzles should therefore be as large as possible or equal to 15 l / h.
  • the average nozzle flow rate is defined by the ratio of the total throughput of the humidifying unit to the total number of nozzles.
  • the droplet diameter according to Sauter is ⁇ 100 ⁇ m irrespective of the respective nozzle throughput. This ensures that the droplet size distribution of a particular spray jet is still fine enough even at high nozzle throughputs, especially at high web speeds of, for example, v ⁇ 1200 m / min and in particular ⁇ 1400 m / min.
  • the nozzle throughput is greater than in the case of the known nozzle moisteners, since the throughput consists of one component
  • Curl influence and a proportion of the moisture profile influencing is composed.
  • the average nozzle throughput is kept at least substantially constant during operation.
  • the average nozzle throughput can be kept constant in order to subject the amount of water to be evaporated in the subsequent drying no temporal variations, whereby time-stable Endtrockengehalte be achieved in the paper web.
  • the intended as a base load share curl influencing is preferably adjustable over the web width sectionally different.
  • the proportion of the curl influencing provided as a base load can also be constant over the web width.
  • the capacity of the moistening device is preferably chosen to be so large that, despite a base load for the curl, there is sufficient potential for influencing the moisture transverse profile.
  • the proportion of the mean throughput of the nozzles affecting the influence of the curl is ⁇ 2 l / h, in particular ⁇ 3 l / h and preferably ⁇ 4 l / h.
  • the moistening unit preferably comprises a plurality of nozzle rows extending transversely to the web running direction.
  • two or four rows of nozzles can be provided.
  • five, six, seven or eight rows of nozzles can be provided, wherein preferably six or eight rows of nozzles are provided.
  • all nozzles of the nozzle moistener can simultaneously serve both to influence the moisture transverse profile and to influence the curl of the fibrous web.
  • a part of the nozzles of the nozzle moisturizer serves exclusively to influence the moisture profile and a part of the nozzles exclusively to influence the curl.
  • a part of the nozzles of the nozzle moisturizer serves at the same time both to influence the moisture transverse profile and to influence the curl of the fibrous web and a part of the nozzles exclusively to influence the curl.
  • the spray quantity delivered by the moistening unit for influencing the moisture transverse profile is preferably separable in sections as seen in the transverse direction.
  • each individual nozzle is separately adjustable.
  • At least for influencing the moisture transverse profile at least one control circuit and / or at least one control circuit is advantageously provided.
  • the regulation or control of the influence of the curl takes place as a function of the mean moisture content of the web and in particular the size of the curl determined in the laboratory test.
  • the moistening unit is advantageously arranged in a region in which the dry content of the fibrous web is ⁇ 80% and preferably ⁇ 85%.
  • the sectioning or zoning is preferably variable.
  • the zone width can be varied, for example, in a range between 25 and 100 mm.
  • the moistening unit is preferably arranged below the lower rollers within a single-tier dryer group.
  • the moistening unit is installed on the last suction roll of the last or penultimate drying group.
  • a steam blower box is provided in front of or within a smoothing device following the drying section for an additional influencing of the curl or the flatness and the surface condition of the fibrous web.
  • the moistening unit according to the invention can therefore also be provided, in particular, in combination with a steam moisturizer inserted in front of or inside a smoothing device following the drying section for further improvement of the flatness and surface condition of the paper.
  • the device according to the invention can be used with particular advantage in a papermaking process with complete or partial one-sided drying of the paper or cardboard or with one-sided surface treatment, for example gluing or brushing, or with an asymmetrical layer structure.
  • the object specified at the outset is moreover achieved by a method for producing and / or treating a fibrous web, in particular paper or board web, in which a common moistening unit is used for influencing the moisture profile and for influencing the curvature of the fibrous web, via which the moisture transverse profile and the curl can be influenced separately from one another.
  • FIG. 1 shows a schematic partial representation of a device 10 for producing and / or treating a fibrous web 12, which may be in particular a paper or board web.
  • the device 10 may thus be in particular a paper machine.
  • a winding device 16 can be seen, in which the pulp or paper web 12 is wound up.
  • a control and / or Control unit 24 is assigned.
  • the moistening unit 22 may comprise a nozzle moistener which simultaneously serves both to influence the moisture transverse profile and to influence the curl of the fibrous web 12.
  • the moistening unit 22 a plurality, in the present case, for example, four transversely to the web running direction L extending rows of nozzles 26, via which the order Suction roll 18 guided fibrous web 12 can be acted upon accordingly.
  • all nozzles of the nozzle moistener can simultaneously serve both to influence the moisture transverse profile and to influence the curl of the fibrous web.
  • a part of the nozzles of the nozzle moisturizer serves exclusively to influence the moisture profile and a part of the nozzles exclusively to influence the curl.
  • a part of the nozzles of the nozzle moisturizer serves at the same time both to influence the moisture transverse profile and to influence the curl of the fibrous web and a part of the nozzles exclusively to influence the curl.
  • the moistening unit 22 formed in the present case by a nozzle moistener can in particular be provided with pneumatic atomizing nozzles 26 and, for example, with two-substance nozzles 26, as described in US Pat DE 199 49 236 A are described. In principle, however, any other types of nozzles can be used.
  • the average throughput of the nozzles 26, determined from the total throughput of the nozzles 26 divided by their number, is preferably ⁇ 15 l / h.
  • the droplet diameter according to Sauter is ⁇ 100 ⁇ m irrespective of the respective nozzle throughput.
  • a traversing measuring device 29 is provided which delivers individual measured values x for the web moisture and corresponding respective snapshots of the moisture transverse profile to the control and / or regulating unit 24.
  • valves 30 are respectively driven or regulated in lines 32 leading to the nozzle rows 26.
  • the spray quantities delivered by the relevant rows of nozzles 26 for influencing the moisture transverse profile are, viewed in the transverse direction, preferably adjustable separately in sections.
  • the control and / or regulating unit 24 may comprise one or more control and / or control circuits 34.
  • the control and / or regulating unit 24 preferably again comprises one or more regulating and / or control circuits 36. also one or more of these higher-level control and / or control circuits may be provided. In general, both functions (moisture profile, curl) comprehensive control and / or regulation is conceivable.
  • valves 26 of the remaining valve rows serving to control the humidity profile are acted upon by the respective local humidity values x i .
  • a moisture transverse profile control can take place.
  • a control is conceivable.
  • both a control and a regulation are conceivable in principle.
  • the manipulated variable for influencing the curl can basically also be adjusted manually.
  • the average average nozzle throughput can be kept at least substantially constant.
  • a respective nozzle throughput (volume / time) V ' Ges (x) is composed of a proportion V' FQP (X) for moisture transverse profile influencing and a proportion V ' curl for influencing curl.
  • the proportion V ' curl for influencing the curvature forms a type of base load, to which the variable portion V' FQP for moisture cross profile influencing is added.
  • the proportion of the curl influencing provided as the base load can be set constant over the web width or differently in the sections.
  • an actuating or nominal profile of the nozzles is indicated by way of example.
  • area a) specifies the base load for the curl and b) the area for the profiling. If several rows of nozzles are provided, these can have identical setting or setpoint profiles or else different setting or setpoint profiles. As already mentioned above, fundamentally different types of nozzle dampening concepts can be used.

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

A paper (12) making machine (10) simultaneously modifies both the transverse moisture cross-sectional profile and curl. The machine (10) especially. incorporates a moisture regulator (22). The transverse moisture cross-sectional profile and curl are especially individually and separately regulated. The moisture regulator (22) is a pneumatically-driven array of atomizing water jets (26) emitting two components at a rate of approx. 15-20 liters/hr. Each water jet spray passes via a droplet measuring Sauter sensor set for (100 m and maintained at a constant average during operation. One first jet component determines the moisture, while the second jet component determines the curl. Also claimed is a commensurate process for the correction of transverse moisture cross-sectional profile and curl.

Description

Die Erfindung betrifft eine Einrichtung sowie ein Verfahren zur Herstellung und/oder Behandlung einer Faserstoffbahn, insbesondere Papier-oder Kartonbahn.The invention relates to a device and a method for producing and / or treating a fibrous web, in particular paper or board web.

Zur Beeinflussung von Curl (Rollneigung) von Papierbahnen wird zum Beispiel Wasser mittels Düsen gleichmäßig über die Papierbahnbreite aufgebracht. Wesentlich ist, dass das Wasser einseitig bzw. bei einer beidseitigen Beaufschlagung zumindest in unterschiedlichen Mengen auf die beiden Seiten aufgebracht wird. Damit wird die Quellungsänderung der Fasern zwischen der Ober- und der Unterseite der Bahn beim Trocknungsprozess gezielt beeinflusst und entsprechend das Curl-Verhalten korrigiert.For influencing curl (curl) of paper webs, for example, water is applied evenly over the web width by means of nozzles. It is essential that the water is applied to one side or at least in different amounts on the two sides in a bidirectional admission. Thus, the swelling change of the fibers between the top and the bottom of the web during the drying process is specifically influenced and corrected accordingly the curl behavior.

Das Wasser kann über Düsen oder über spezielle Walzenauftragswerke aufgebracht werden. Insbesondere bei qualitativ hochwertigen Papieren muss zusätzlich noch auf ein möglichst gutes Feuchtequerprofil geachtet werden. Dies wird durch sektional steuerbare Düsenfeuchter erreicht.The water can be applied via nozzles or special roller applicators. In the case of high-quality papers in particular, attention must be paid to the best possible moisture cross-section. This is achieved by sectionally controllable nozzle dampers.

Bisher waren zur gleichzeitigen Beeinflussung von Curl und Feuchtequerprofile jeweils separate Vorrichtungen erforderlich. Solche bekannten Ausführungen sind hinsichtlich Investition und Wartung nun aber sehr aufwendig.So far, separate devices were required for simultaneously influencing curl and moisture transverse profiles. However, such known designs are now very expensive in terms of investment and maintenance.

Bei den bisher üblichen Düsenfeuchtern zur Einstellung des Feuchtequerprofils liegt die maximale Auftragsmenge je Düse in einem Bereich von 12 bis 15 l/h bei einem Tröpfchendurchmesser nach Sauter ≤ 100 µm. Bei dem sogenannten Sauter-Durchmesser handelt es sich um einen mittleren Durchmesser, der zur Spraycharakterisierung benutzt wird. Ein Tropfen dieses Durchmessers hat das gleiche Verhältnis von Volumen zu Oberfläche wie die gesamte (Spray-)Probe, also die Summe aller Oberflächen und Volumina.In the hitherto customary nozzle dampers for adjusting the moisture profile, the maximum application amount per nozzle is in a range of 12 to 15 l / h with a droplet diameter Sauter ≤ 100 microns. The so-called Sauter diameter is an average diameter used for spray characterization. A drop of this diameter has the same volume to surface ratio as the total (spray) sample, ie the sum of all surfaces and volumes.

Bei den bisher üblichen Einrichtungen erfolgt die Korrektur des Curls, d.h. der Planlage des Papiers durch eine zweireihige Anordnung der Trockenzylinder zumindest am Ende der Trockenpartie oder einen Dampfauftrag auf der Papierunterseite nach der Trockenpartie und/oder einen zusätzlichen Wasserauftrag auf die Papierbahnunterseite.In the hitherto conventional devices, the correction of the curl, i. the flatness of the paper by a two-row arrangement of the drying cylinder at least at the end of the dryer section or a steam application on the paper underside after the dryer section and / or an additional application of water to the paper web bottom.

Mit den bisher bekannten Einrichtungen ergibt sich teilweise eine relativ schlechte Planlage des Papiers.With the previously known devices results in part, a relatively poor flatness of the paper.

Der Erfindung liegt die Aufgabe zugrunde, eine verbesserte Einrichtung sowie ein verbessertes Verfahren der eingangs genannten Art zu schaffen, bei denen die zuvor genannten Nachteile beseitigt sind.The invention has for its object to provide an improved device and an improved method of the type mentioned, in which the aforementioned disadvantages are eliminated.

Diese Aufgabe wird erfindungsgemäß gelöst durch eine Einrichtung zur Herstellung und/ oder Behandlung einer Faserstoffbahn, insbesondere Papier- oder Kartonbahn, mit einem gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faser-stoffbahn dienenden Düsenfeuchter, wobei das Feuchtequerprofil und der Curl getrennt voneinander beeinflussbar sind,
wobei sich ein jeweiliger Durchsatz des Düsenfeuchters aus einem Anteil zur Feuchtequerprofilbeeinflussung und einem Anteil zur Curlbeeinflussung zusammensetzt und wobei der als Grundlast vorgesehene Anteil zur Curlbeeinflussung in einem Bereich zwischen 10 bis 50 % des Gesamtdurchsatzes liegt oder einstellbar ist.This object is achieved by a device for producing and / or treating a fibrous web, in particular paper or board web, with a both the influence of the moisture profile and the influence of the curl of the fibrous web serving nozzle moisturizer, wherein the moisture profile and the Curl can be influenced separately from each other,
wherein a respective throughput of the Düsenfeuchters composed of a proportion for Feuchtequerprofilbeeinflussung and a proportion for curl influencing and wherein the intended as a base load share for curl influencing in a range between 10 to 50% of the total throughput is or is adjustable.

Beispielsweise ist aus der Patentschrift US 5,416,980 ein Verfahren und eine Vorrichtung für die Trockenpartie einer Papiermaschine bekannt, welche die Curl-Neigung des Papiers verringern sollen. Die Papierbahn wird durch Anpressen auf die Trockenzylinder durch ein Trockensieb getrocknet. Über die gesamte Breite der Papierbahn wird in der Trockensektion heißer Wasserdampf zugeführt, durch welchen im Faservlies aufgebaute Spannungen entlastet werden sollen. Auf diese Weise soll das Curl- und/oder Feuchtigkeitsprofil beeinflusst werden.For example, from the patent US 5,416,980 a method and an apparatus for the dryer section of a paper machine are known which are intended to reduce the curl tendency of the paper. The paper web is dried by pressing on the drying cylinder through a drying wire. Over the entire width of the paper web, hot steam is supplied in the dry section, by means of which stresses built up in the fiber web are to be relieved. In this way, the curl and / or moisture profile should be influenced.

Aus der EP 0 742 313 A2 geht ebenfalls eine Trockenpartie für eine Papiermaschine hervor. Diese weist eine sich über die Papierbahribreite erstreckende Befeuchtungsvorrichtung auf, welche nach der Trockenpartie und vor einem Kalander angeordnet ist.From the EP 0 742 313 A2 also shows a drying section for a paper machine. This has an over the Papierbahribreite extending moistening device, which is arranged after the drying section and in front of a calender.

Die WO 00/00696 A1 zeigt diverse Vorrichtungen zur Befeuchtung einer eine Trockengruppe einer Papiermaschine durchlaufenden Papierbahn, beispielsweise durch Befeuchtungswalzen oder Befeuchtungsfilze.The WO 00/00696 A1 shows various devices for moistening a paper web passing through a drying group of a paper machine, for example by moistening rollers or moistening felts.

Aufgrund dieser Ausbildung sind die Korrekturen des Feuchtequerprofils und des Curls nunmehr mittels einer einzigen kompakten Einheit wie z.B. mittels eines einzigen Düsenfeuchters möglich. Dies ist vor allem bei graphischen Papieren wie z.B. Zeitungsdruck- und insbesondere SC-Papieren, die im online-Verfahren (Presse und Supercalander) produziert werden, von erheblichem Vorteil.Due to this design, the corrections of the moisture profile and the curl are now made by means of a single compact unit, e.g. possible by means of a single nozzle moistener. This is especially true for graphic papers such as e.g. Newsprint and in particular SC papers, which are produced in the online process (press and supercalender), of considerable advantage.

Erfindungsgemäß werden also zwei Anforderungen oder Funktionen (Feuchtequerprofil, Planlage) in einem einzigen Aggregat vereint bzw. verwirklicht. Es ist somit beispielsweise eine Egalisierung des Feuchtequerprofils der Faserstoffbahn bei gleichzeitiger Mindest-Rückbefeuchtung der Bahn über die gesamte Breite zur Gewährleistung der Planlage der Faserstoffbahn möglich. Eine zuverlässige Feuchtequerprofilregelung sowie Korrektur der Planlage ist auch noch bei höheren Maschinengeschwindigkeiten, d.h. bei kurzer Verweilzeit der Bahn im Bereich der Befeuchtungseinheit, sichergestellt. Die erfindungsgemäße Einrichtung ist insbesondere auch für Papiere hohen Flächengewichts geeignet.Thus, according to the invention, two requirements or functions (moisture transverse profile, flatness) are united or realized in a single aggregate. It is thus possible, for example, a leveling of the moisture profile of the fibrous web with simultaneous minimum Rückbefeuchtung the web over the entire width to ensure the flatness of the fibrous web. Reliable moisture cross profile control and flatness correction is still possible at higher machine speeds, i. with a short residence time of the web in the area of the moistening unit, ensured. The device according to the invention is particularly suitable for papers of high basis weight.

Wesentlich ist insbesondere auch, dass die beiden Funktionen (Feuchtequerprofil, Curl) trotz der Verwendung einer einzigen Befeuchtungseinheit nicht nur parallel, sondern auch unabhängig voneinander erfüllt werden können.In particular, it is also essential that the two functions (moisture transverse profile, curl) can be fulfilled not only in parallel but also independently of one another, despite the use of a single moistening unit.

Bei einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Einrichtung umfasst die Befeuchtungseinheit einen gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faserstoffbahn dienenden Düsenfeuchter.In a preferred practical embodiment of the device according to the invention, the moistening unit comprises a nozzle moistener which simultaneously serves both to influence the moisture transverse profile and to influence the curl of the fibrous web.

Der Düsenfeuchter kann mit pneumatischen Zerstäuberdüsen versehen sein.The nozzle moistener may be provided with pneumatic atomizing nozzles.

Vorteilhafterweise ist der Düsenfeuchter mit Zweistoff-Düsen versehen. Diese können beispielsweise einen solchen Aufbau besitzen, wie dies in der DE 199 49 236 A beschrieben ist. Es können also insbesondere mit einem gasförmigen Medium und einem flüssigen Medium beaufschlagte Zweistoff-Sprühdüsen eingesetzt werden.Advantageously, the nozzle moistener is provided with dual-substance nozzles. These may for example have such a structure, as shown in the DE 199 49 236 A is described. It can therefore be used in particular with a gaseous medium and a liquid medium acted upon two-component spray nozzles.

Vorzugsweise ist der mittlere Durchsatz der Düsen des Düsenfeuchters, ermittelt aus dem Gesamtdurchsatz der Düsen dividiert durch deren Anzahl, ≥ 15 l/h. Dabei kann der mittlere Durchsatz der Düsen des Düsenfeuchters insbesondere in einem Bereich von 15 l/h bis 30 l/h und vorzugsweise in einem Bereich von 15 l/h bis 20 l/h liegen.The average throughput of the nozzles of the nozzle moisturizer, determined from the total throughput of the nozzles divided by their number, is preferably ≥ 15 l / h. In this case, the average throughput of the nozzles of the nozzle moisturizer can be in particular in a range of 15 l / h to 30 l / h and preferably in a range of 15 l / h to 20 l / h.

Der mittlere Durchsatz aller Düsen soll also möglichst größer oder gleich 15 l/h sein. Hierbei ist der mittlere Düsendurchsatz definiert durch das Verhältnis des Gesamtdurchsatzes der Befeuchtungseinheit zur Gesamtzahl der Düsen.The average throughput of all nozzles should therefore be as large as possible or equal to 15 l / h. Here, the average nozzle flow rate is defined by the ratio of the total throughput of the humidifying unit to the total number of nozzles.

Vorzugsweise ist in jedem von der Befeuchtungseinheit erzeugten Sprühstrahl der Tröpfchendurchmesser nach Sauter unabhängig vom jeweiligen Düsendurchsatz ≤ 100 µm.
Damit ist insbesondere auch bei hohen Bahnlaufgeschwindigkeiten von z.B. v ≥ 1200 m/min und insbesondere ≥ 1400 m/min sichergestellt, dass die Tröpfchengrößenverteilung eines jeweiligen Sprühstrahles auch bei größeren Düsendurchsätzen noch fein genug ist. Bei der erfindungsgemäßen Befeuchtungseinheit ist der Düsendurchsatz größer als bei den bekannten Düsenfeuchtern, da sich der Durchsatz aus einem Anteil zurPreferably, in each spray jet generated by the moistening unit, the droplet diameter according to Sauter is ≤ 100 μm irrespective of the respective nozzle throughput.
This ensures that the droplet size distribution of a particular spray jet is still fine enough even at high nozzle throughputs, especially at high web speeds of, for example, v ≥ 1200 m / min and in particular ≥ 1400 m / min. In the case of the moistening unit according to the invention, the nozzle throughput is greater than in the case of the known nozzle moisteners, since the throughput consists of one component

Curlbeeinflussung und einem Anteil zur Feuchtequerprofilbeeinflussung zusammensetzt.Curl influence and a proportion of the moisture profile influencing is composed.

Bei einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Einrichtung wird während des Betriebs der mittlere Düsendurchsatz zumindest im Wesentlichen konstant gehalten.In a preferred practical embodiment of the device according to the invention, the average nozzle throughput is kept at least substantially constant during operation.

Es kann also zum Beispiel während der Produktion einer bestimmten Papiersorte der mittlere Düsendurchsatz konstant gehalten werden, um die zu verdampfende Wassermenge in der nachfolgenden Trocknung keinen zeitlichen Schwankungen zu unterwerfen, wodurch zeitlich stabile Endtrockengehalte in der Papierbahn erreicht werden.Thus, for example, during the production of a certain type of paper, the average nozzle throughput can be kept constant in order to subject the amount of water to be evaporated in the subsequent drying no temporal variations, whereby time-stable Endtrockengehalte be achieved in the paper web.

Der als Grundlast vorgesehene Anteil zur Curlbeeinflussung ist vorzugsweise über die Bahnbreite sektional unterschiedlich einstellbar. Grundsätzlich kann der als Grundlast vorgesehene Anteil zur Curlbeeinflussung jedoch auch über die Bahnbreite konstant sein.The intended as a base load share curl influencing is preferably adjustable over the web width sectionally different. In principle, however, the proportion of the curl influencing provided as a base load can also be constant over the web width.

Die Kapazität der Befeuchungseinrichtung ist vorzugsweise so groß gewählt, dass trotz einer Grundlast für den Curl ausreichend Potential für eine Beeinflussung des Feuchtequerprofils vorhanden ist.The capacity of the moistening device is preferably chosen to be so large that, despite a base load for the curl, there is sufficient potential for influencing the moisture transverse profile.

Von Vorteil ist insbesondere auch, wenn der die Curlbeeinflussung betreffende Anteil des mittleren Durchsatzes der Düsen ≥ 2 l/h, insbesondere ≥ 3 l/h und vorzugsweise ≥ 4 l/h beträgt.It is particularly advantageous if the proportion of the mean throughput of the nozzles affecting the influence of the curl is ≥ 2 l / h, in particular ≥ 3 l / h and preferably ≥ 4 l / h.

Die Befeuchtungseinheit umfasst vorzugsweise mehrere sich jeweils quer zur Bahnlaufrichtung erstreckende Düsenreihen. Dabei können beispielsweise zwei oder vier Düsenreihen vorgesehen sein. Vorteilhafterweise können auch fünf, sechs, sieben oder acht Düsenreihen vorgesehen sein, wobei vorzugsweise sechs oder acht Düsenreihen vorgesehen sind.The moistening unit preferably comprises a plurality of nozzle rows extending transversely to the web running direction. In this case, for example, two or four rows of nozzles can be provided. Advantageously, five, six, seven or eight rows of nozzles can be provided, wherein preferably six or eight rows of nozzles are provided.

Es sind mehrere konstruktive und technologische Konzepte eines Düsenfeuchters zur gleichzeitigen Profilierung und Curlbeeinflussung denkbar.There are several design and technological concepts of a nozzle humidifier for simultaneous profiling and Curlbeeinflussung conceivable.

So können gemäß einer zweckmäßigen Ausführungsform der erfindungsgemäßen Einrichtung beispielsweise alle Düsen des Düsenfeuchters gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faserstoffbahn dienen.Thus, according to an expedient embodiment of the device according to the invention, for example, all nozzles of the nozzle moistener can simultaneously serve both to influence the moisture transverse profile and to influence the curl of the fibrous web.

Bei einer anderen zweckmäßigen Ausführungsform dient beispielsweise ein Teil der Düsen des Düsenfeuchters ausschließlich der Beeinflussung des Feuchtequerprofils und ein Teil der Düsen ausschließlich der Beeinflussung des Curls.In another expedient embodiment, for example, a part of the nozzles of the nozzle moisturizer serves exclusively to influence the moisture profile and a part of the nozzles exclusively to influence the curl.

Gemäß einer weiteren zweckmäßigen Ausführungsform dient ein Teil der Düsen des Düsenfeuchters gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faserstoffbahn und ein Teil der Düsen ausschließlich der Beeinflussung des Curls.According to a further expedient embodiment, a part of the nozzles of the nozzle moisturizer serves at the same time both to influence the moisture transverse profile and to influence the curl of the fibrous web and a part of the nozzles exclusively to influence the curl.

Es ist beispielsweise auch eine solche Ausführung denkbar, bei der ein Teil der Düsen des Düsenfeuchters gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faserstoffbahn und ein Teil der Düsen ausschließlich der Beeinflussung des Feuchtequerprofils dient.It is also conceivable, for example, such an embodiment, in which a part of the nozzle of the nozzle moisturizer both the influence of the moisture profile and the influence of the curl of the fibrous web and a part of the nozzle serves exclusively to influence the moisture profile.

Grundsätzlich sind auch beliebige andere Düsenfeuchter-Konzepte denkbar.In principle, any other nozzle-moisture concepts are conceivable.

Die von der Befeuchtungseinheit abgegebene Sprühmenge zur Beeinflussung des Feuchtequerprofils ist in Querrichtung betrachtet vorzugsweise sektional getrennt einstellbar. Vorzugsweise ist jede Einzeldüse getrennt einstellbar.The spray quantity delivered by the moistening unit for influencing the moisture transverse profile is preferably separable in sections as seen in the transverse direction. Preferably, each individual nozzle is separately adjustable.

Zumindest zur Beeinflussung des Feuchtequerprofils ist vorteilhafterweise wenigstens ein Regelkreis und/oder wenigstens ein Steuerkreis vorgesehen.At least for influencing the moisture transverse profile, at least one control circuit and / or at least one control circuit is advantageously provided.

Bei einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Einrichtung erfolgt die Regelung bzw. Steuerung der Beeinflussung des Curls in Abhängigkeit von der mittleren Bahnfeuchte und insbesondere der Größe des im Labortest ermittelten Curls.In a preferred practical embodiment of the device according to the invention, the regulation or control of the influence of the curl takes place as a function of the mean moisture content of the web and in particular the size of the curl determined in the laboratory test.

Die Befeuchtungseinheit ist vorteilhafterweise in einem Bereich angeordnet, in dem der Trockengehalt der Faserstoffbahn ≥ 80 % und vorzugsweise ≥ 85 % ist.The moistening unit is advantageously arranged in a region in which the dry content of the fibrous web is ≥ 80% and preferably ≥ 85%.

Die Sektionierung oder Zoneneinteilung ist vorzugsweise variabel. So kann die Zonenbreite beispielsweise in einem Bereich zwischen 25 und 100 mm variierbar sein.The sectioning or zoning is preferably variable. Thus, the zone width can be varied, for example, in a range between 25 and 100 mm.

Die Befeuchtungseinheit ist bevorzugt unterhalb der unteren Walzen innerhalb einer einreihigen Trockengruppe angeordnet.The moistening unit is preferably arranged below the lower rollers within a single-tier dryer group.

In bestimmten Fällen ist es auch von Vorteil, wenn die Befeuchtungseinheit an der letzten Saugwalze der letzten oder vorletzten Trockengruppe eingebaut ist.In certain cases, it is also advantageous if the moistening unit is installed on the last suction roll of the last or penultimate drying group.

Gemäß einer weiteren zweckmäßigen Ausführungsform der erfindungsgemäßen Einrichtung ist für eine zusätzliche Beeinflussung des Curls oder der Planlage und der Oberflächenbeschaffenheit der Faserstoffbahn vor oder innerhalb einer Glätteinrichtung im Anschluss an die Trockenpartie ein Dampfblaskasten vorgesehen. Die erfindungsgemäße Befeuchtungseinheit kann also insbesondere auch in Kombination mit einem vor oder innerhalb einer Glätteinrichtung im Anschluss an die Trockenpartie zur weiteren Verbesserung der Planlage und Oberflächenbeschaffenheit des Papiers eingesetzten Dampffeuchter vorgesehen sein.According to a further expedient embodiment of the device according to the invention, a steam blower box is provided in front of or within a smoothing device following the drying section for an additional influencing of the curl or the flatness and the surface condition of the fibrous web. The moistening unit according to the invention can therefore also be provided, in particular, in combination with a steam moisturizer inserted in front of or inside a smoothing device following the drying section for further improvement of the flatness and surface condition of the paper.

Die erfindungsgemäße Einrichtung ist mit besonderem Vorteil verwendbar in einem Papierherstellungsprozess mit vollständig oder teilweise einseitiger Trocknung des Papiers bzw. Kartons oder mit einseitiger Oberflächenbehandlung, zum Beispiel Leimen oder Streichen, oder mit einem unsymmetrischen Lagenaufbau.The device according to the invention can be used with particular advantage in a papermaking process with complete or partial one-sided drying of the paper or cardboard or with one-sided surface treatment, for example gluing or brushing, or with an asymmetrical layer structure.

Erfindungsgemäß wird die eingangs angegebene Aufgabe überdies gelöst durch ein Verfahren zur Herstellung und/ oder Behandlung einer Faserstoffbahn, insbesondere Papier- oder Kartonbahn, bei dem zur Beeinflussung des Feuchtequerprofils und zur Beeinflussung des Curls der Faserstoffbahn eine gemeinsame Befeuchtungseinheit verwendet wird, über die das Feuchtequerprofil und der Curl getrennt voneinander beeinflussbar sind.According to the invention, the object specified at the outset is moreover achieved by a method for producing and / or treating a fibrous web, in particular paper or board web, in which a common moistening unit is used for influencing the moisture profile and for influencing the curvature of the fibrous web, via which the moisture transverse profile and the curl can be influenced separately from one another.

Bevorzugte Ausgestaltungen des erfindungsgemäßen Verfahrens sind in den Unteransprüchen angegeben.Preferred embodiments of the method according to the invention are specified in the subclaims.

Aufgrund der erfindungsgemäßen Lösung ist somit eine einzige Einheit ausreichend, um die Feuchte und die Planlage zu korrigieren. Insgesamt ergibt sich ein geringerer Investitionsbedarf sowie ein geringerer Wartungsaufwand. Nachdem mit der erfindungsgemäßen Einheit zur Rückfeuchtung der Faserstoffbahn zur gleichzeitigen Beeinflussung des Feuchtequerprofils und der Planlage der Faserstoffbahn der Einsatz einer nachgeschalteten Befeuchtungseinrichtung zur Curl-Korrektur entfällt, ist auch eine nachträgliche unerwünschte Beeinflussung des Feuchteprofils sowie der Oberflächeneigenschaften des Papiers ausgeschlossen.Because of the solution according to the invention, therefore, a single unit is sufficient to correct the moisture and the flatness. Overall, there is a lower investment requirement and a lower maintenance. After using the unit according to the invention for the rewet of the fibrous web for simultaneously influencing the moisture profile and the flatness of the fibrous web eliminates the use of a downstream moistening for curl correction, a subsequent undesirable influence on the moisture profile and the surface properties of the paper is excluded.

Die Erfindung wird im Folgenden anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:

Figur 1
eine schematische Teildarstellung einer Papiermaschine mit einer gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faserstoffbahn dienenden Befeuchtungsein- heit mit zugeordneter Steuer- und/oder Regeleinheit,
Figur 2
ein Diagramm, in dem der Düsendurchsatz über der Bahnbreite dargestellt ist, und
Figur 3
ein Diagramm, in dem ein beispielhaftes Stell- oder Sollprofil der Düsen angedeutet ist.
The invention will be explained in more detail below with reference to an embodiment with reference to the drawing; in this show:
FIG. 1
a schematic partial view of a paper machine with a both the influence of the moisture profile and the influence of the curl of the fibrous web serving humidification unit with associated control and / or regulating unit,
FIG. 2
a diagram in which the nozzle throughput over the web width is shown, and
FIG. 3
a diagram in which an exemplary setting or nominal profile of the nozzles is indicated.

Figur 1 zeigt in schematischer Teildarstellung eine Einrichtung 10 zur Herstellung und/ oder Behandlung einer Faserstoffbahn 12, bei der es sich insbesondere um eine Papier- oder Kartonbahn handeln kann. Bei der Einrichtung 10 kann es sich also insbesondere um eine Papiermaschine handeln. In der Figur 1 ist ein Teil der Trockenpartie 14 sowie eine Wickelvorrichtung 16 zu erkennen, in der die Faserstoff- bzw. Papierbahn 12 aufgewickelt wird. FIG. 1 shows a schematic partial representation of a device 10 for producing and / or treating a fibrous web 12, which may be in particular a paper or board web. The device 10 may thus be in particular a paper machine. In the FIG. 1 is a part of the drying section 14 and a winding device 16 can be seen, in which the pulp or paper web 12 is wound up.

Im Bereich der Trockenpartie 14, im vorliegenden Fall unterhalb einer Saugwalze 18 einer oberen Trockenzylinder 20 umfassenden einreihigen Trockengruppe, ist eine gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faserstoffbahn 12 dienende Befeuchtungseinheit 22 vorgesehen, der eine Steuer- und/ oder Regeleinheit 24 zugeordnet ist.In the area of the drying section 14, in the present case below a suction roller 18 of an upper drying cylinder 20 comprising a single-row dryer group, a simultaneously both the influence of the moisture profile and the influence of the curl of the fibrous web 12 serving humidification unit 22 is provided, a control and / or Control unit 24 is assigned.

Die Befeuchtungseinheit 22 kann insbesondere einen gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faserstoffbahn 12 dienenden Düsenfeuchter umfassen.In particular, the moistening unit 22 may comprise a nozzle moistener which simultaneously serves both to influence the moisture transverse profile and to influence the curl of the fibrous web 12.

Wie anhand der Figur 1 zu erkennen ist, weist die Befeuchtungseinheit 22 mehrere, im vorliegenden Fall zum Beispiel vier sich quer zur Bahnlaufrichtung L erstreckende Reihen von Düsen 26 auf, über die die um die Saugwalze 18 geführte Faserstoffbahn 12 entsprechend beaufschlagbar ist.As based on the FIG. 1 can be seen, the moistening unit 22 a plurality, in the present case, for example, four transversely to the web running direction L extending rows of nozzles 26, via which the order Suction roll 18 guided fibrous web 12 can be acted upon accordingly.

Es sind mehrere konstruktive und technologische Konzepte eines Düsenfeuchters zur gleichzeitigen Profilierung und Curlbeeinflussung denkbar.There are several design and technological concepts of a nozzle humidifier for simultaneous profiling and Curlbeeinflussung conceivable.

So können gemäß einer zweckmäßigen Ausführungsform der erfindungsgemäßen Einrichtung beispielsweise alle Düsen des Düsenfeuchters gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faserstoffbahn dienen.Thus, according to an expedient embodiment of the device according to the invention, for example, all nozzles of the nozzle moistener can simultaneously serve both to influence the moisture transverse profile and to influence the curl of the fibrous web.

Bei einer anderen zweckmäßigen Ausführungsform dient beispielsweise ein Teil der Düsen des Düsenfeuchters ausschließlich der Beeinflussung des Feuchtequerprofils und ein Teil der Düsen ausschließlich der Beeinflussung des Curls.In another expedient embodiment, for example, a part of the nozzles of the nozzle moisturizer serves exclusively to influence the moisture profile and a part of the nozzles exclusively to influence the curl.

Gemäß einer weiteren zweckmäßigen Ausführungsform dient ein Teil der Düsen des Düsenfeuchters gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faserstoffbahn und ein Teil der Düsen ausschließlich der Beeinflussung des Curls.According to a further expedient embodiment, a part of the nozzles of the nozzle moisturizer serves at the same time both to influence the moisture transverse profile and to influence the curl of the fibrous web and a part of the nozzles exclusively to influence the curl.

Es ist beispielsweise auch eine solche Ausführung denkbar, bei der ein Teil der Düsen des Düsenfeuchters gleichzeitig sowohl der Beeinflussung des Feuchtequerprofils als auch der Beeinflussung des Curls der Faserstoffbahn und ein Teil der Düsen ausschließlich der Beeinflussung des Feuchtequerprofils dient.It is also conceivable, for example, such an embodiment, in which a part of the nozzle of the nozzle moisturizer both the influence of the moisture profile and the influence of the curl of the fibrous web and a part of the nozzle serves exclusively to influence the moisture profile.

Grundsätzlich sind auch beliebige andere Düsenfeuchter-Konzepte denkbar.In principle, any other nozzle-moisture concepts are conceivable.

Die im vorliegenden Fall durch einen Düsenfeuchter gebildete Befeuchtungseinheit 22 kann insbesondere mit pneumatischen Zerstäuberdüsen 26 und beispielsweise mit Zweistoff-Düsen 26 versehen sein, wie sie in der DE 199 49 236 A beschrieben sind. Grundsätzlich sind jedoch auch beliebige andere Düsenarten einsetzbar.The moistening unit 22 formed in the present case by a nozzle moistener can in particular be provided with pneumatic atomizing nozzles 26 and, for example, with two-substance nozzles 26, as described in US Pat DE 199 49 236 A are described. In principle, however, any other types of nozzles can be used.

Der mittlere Durchsatz der Düsen 26, ermittelt aus dem Gesamtdurchsatz der Düsen 26 dividiert durch deren Anzahl, ist vorzugsweise ≥ 15 l/h. Vorteilhafterweise ist in jedem von den Düsen 26 erzeugten Sprühstrahl 28 der Tröpfchendurchmesser nach Sauter unabhängig vom jeweiligen Düsendurchsatz ≤ 100 µm.The average throughput of the nozzles 26, determined from the total throughput of the nozzles 26 divided by their number, is preferably ≥ 15 l / h. Advantageously, in each spray jet 28 generated by the nozzles 26, the droplet diameter according to Sauter is ≦ 100 μm irrespective of the respective nozzle throughput.

Während die in Bahnlaufrichtung L vordere Düsenreihe zur Curlbeeinflussung vorgesehen ist, dienen die darauffolgenden verbleibenden drei Düsenreihen 26 der Feuchtequerprofilbeeinflussung. Wie bereits erwähnt, ist grundsätzlich auch eine beliebige andere Anzahl von Düsenreihen denkbar.While the front row of nozzles in the web running direction L is provided for influencing the curl, the subsequent remaining three rows of nozzles 26 serve to influence the moisture profile. As already mentioned, any other number of nozzle rows is conceivable in principle.

Im Bereich zwischen der Trockenpartie 14 und der Wickelvorrichtung 16 ist eine traversierende Messeinrichtung 29 vorgesehen, die Einzelmesswerte x für die Bahnfeuchte und entsprechend jeweilige Momentaufnahmen des Feuchtequerprofils an die Steuer- und /oder Regeleinheit 24 liefert.In the area between the dryer section 14 and the winding device 16, a traversing measuring device 29 is provided which delivers individual measured values x for the web moisture and corresponding respective snapshots of the moisture transverse profile to the control and / or regulating unit 24.

Über die Steuer- und/oder Regeleinheit 24 werden Ventile 30 in zu den Düsenreihen 26 führenden Leitungen 32 entsprechend angesteuert bzw, geregelt.Via the control and / or regulating unit 24, valves 30 are respectively driven or regulated in lines 32 leading to the nozzle rows 26.

Die von den betreffenden Düsenreihen 26 zur Beeinflussung des Feuchtequerprofils abgegebenen Sprühmengen sind in Querrichtung betrachtet vorzugsweise sektional getrennt einstellbar. Es ist insbesondere auch eine solche Ausführung denkbar, bei der das Feuchtequerprofil für jede betreffende Düsenreihe getrennt einstellbar ist. Zur Beeinflussung des Feuchtequerprofils kann die Steuer- und/oder Regeleinheit 24 einen oder mehrere Regel- und/ oder Steuerkreise 34 umfassen. Auch zur Beeinflussung des Curls umfasst die Steuer- und/oder Regeleinheit 24 vorzugsweise wieder einen oder mehrere Regel- und/oder Steuerkreise 36. Zudem können z.B. auch ein oder mehrere diesen übergeordneten Steuer-und/oder Regelkreise vorgesehen sein. Generell ist eine beide Funktionen (Feuchtequerprofil, Curl) umfassende Steuerung und/ oder Regelung denkbar.The spray quantities delivered by the relevant rows of nozzles 26 for influencing the moisture transverse profile are, viewed in the transverse direction, preferably adjustable separately in sections. In particular, such an embodiment is also conceivable in which the moisture transverse profile can be set separately for each nozzle row concerned. To influence the moisture cross profile, the control and / or regulating unit 24 may comprise one or more control and / or control circuits 34. Also for influencing the curl, the control and / or regulating unit 24 preferably again comprises one or more regulating and / or control circuits 36. also one or more of these higher-level control and / or control circuits may be provided. In general, both functions (moisture profile, curl) comprehensive control and / or regulation is conceivable.

Zur Curlbeeinflussung wird die betreffende Düsenreihe 26, hier z.B. die in Bahnlaufrichtung L betrachtet erste Düsenreihe, über die Steuer-und/oder Regeleinheit 24 mit einer entsprechenden Stellgröße beaufschlagt, die in der Steuer- und/oder Regeleinheit 24 z.B. durch eine Mittelwertbildung über die Breite erzeugt wurde und über die die Grundlast eingestellt wird, die den Anteil des Düsendurchsatzes zur Curlbeeinflussung bestimmt.For influencing the curvature, the relevant nozzle row 26, here e.g. the first row of nozzles, viewed in the web running direction L, is acted upon by the control and / or regulating unit 24 with a corresponding manipulated variable, which in the control and / or regulating unit 24 is connected to the control unit 24, e.g. was generated by averaging over the width and over which the base load is set, which determines the proportion of the nozzle throughput for curl influencing.

Über die mit den Steuerausgängen x1 - xn der Steuer- und/oder Regeleinheit 24 verbundenen Steuerleitungen 42 werden die Ventile 26 der der Feuchtequerprofilbeeinflussung dienenden restlichen Ventilreihen mit den betreffenden lokalen Feuchtewerten xi beaufschlagt. Dabei kann insbesondere eine Feuchtequerprofilregelung erfolgen. Grundsätzlich ist jedoch auch eine Steuerung denkbar. Auch bezüglich der Curlbeeinflussung ist grundsätzlich sowohl eine Steuerung als auch eine Regelung denkbar.Via the control lines 42 connected to the control outputs x 1 -x n of the control and / or regulating unit 24, the valves 26 of the remaining valve rows serving to control the humidity profile are acted upon by the respective local humidity values x i . In particular, a moisture transverse profile control can take place. In principle, however, a control is conceivable. With regard to the influence of curvature, both a control and a regulation are conceivable in principle.

Die Stellgröße für die Curlbeeinflussung kann grundsätzlich auch von Hand einstellbar sein.The manipulated variable for influencing the curl can basically also be adjusted manually.

Zur Herstellung einer jeweiligen Papiersorte kann der durchschnittliche mittlere Düsendurchsatz zumindest im Wesentlichen konstant gehalten werden.To produce a respective type of paper, the average average nozzle throughput can be kept at least substantially constant.

In dem Diagramm gemäß Figur 2 ist der Düsendurchsatz über der Bahnbreite dargestellt. Wie anhand dieses Diagramms zu erkennen ist, setzt sich ein jeweiliger Düsendurchsatz (Volumen/Zeit) V'Ges(x) aus einem Anteil V'FQP(X) zur Feuchtequerprofilbeeinflussung und einem Anteil V'Curl zur Curlbeeinflussung zusammen. Dabei bildet der Anteil V'Curl zur Curlbeeinflussung eine Art Grundlast, zu der der variable Anteil V'FQP zur Feuchtequerprofilbeeinflussung hinzukommt. Der als Grundlast vorgesehene Anteil zur Curlbeeinflussung kann über die Bahnbreite konstant oder sektional unterschiedlich einstellbar sein.In the diagram according to FIG. 2 the nozzle flow rate over the web width is shown. As can be seen from this diagram, a respective nozzle throughput (volume / time) V ' Ges (x) is composed of a proportion V' FQP (X) for moisture transverse profile influencing and a proportion V ' curl for influencing curl. In this case, the proportion V ' curl for influencing the curvature forms a type of base load, to which the variable portion V' FQP for moisture cross profile influencing is added. The proportion of the curl influencing provided as the base load can be set constant over the web width or differently in the sections.

In dem Diagramm gemäß Fig. 3 ist rein beispielhaft ein Stell- oder Sollprofil der Düsen angedeutet. Dabei ist mit dem Bereich a) die Grundlast für den Curl und mit b) der Bereich für die Profilierung angegeben. Sind mehrere Düsenreihen vorgesehen, so können diese identische Stell- bzw. Sollprofile oder auch unterschiedliche Stell- bzw. Sollprofile aufweisen. Wie zuvor bereits erwähnt, können grundsätzlich verschiedene Düsenfeucht-Konzepte zum Einsatz kommen.In the diagram according to Fig. 3 For example, an actuating or nominal profile of the nozzles is indicated by way of example. In this case, area a) specifies the base load for the curl and b) the area for the profiling. If several rows of nozzles are provided, these can have identical setting or setpoint profiles or else different setting or setpoint profiles. As already mentioned above, fundamentally different types of nozzle dampening concepts can be used.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Einrichtung, PapiermaschineFurnishing, paper machine
1212
FaserstoffbahnFibrous web
1414
Trockenpartiedrying section
1616
Wickelvorrichtungwinder
1818
Saugwalzesuction roll
2020
Trockenzylinderdrying cylinders
2222
Befeuchtungseinheithumidification
2424
Steuer- und/oder RegeleinheitControl and / or regulating unit
2626
Düse, DüsenreiheNozzle, nozzle row
2828
traversierende Messeinrichtungtraversing measuring device
3030
VentilValve
3232
Leitungmanagement
3434
Regel- und/ oder SteuerkreisControl and / or control circuit
3636
Regel- und/oder SteuerkreisControl and / or control circuit
4040
Steuerleitungcontrol line
4242
Steuerleitungcontrol line
aa
Grundlast für den CurlBase load for the curl
bb
Bereich für die ProfilierungArea for profiling
xx
Einzelmesswert für die FeuchteSingle measured value for the humidity
LL
BahnlaufrichtungWeb direction

Claims (37)

  1. Equipment (10) for producing and/or treating a fibrous web (12), in particular paper or board web, having a nozzle moistener (22) used simultaneously both to influence the cross-machine moisture profile and to influence the curl of the fibrous web (12), it being possible for the cross-machine moisture profile and the curl to be influenced independently of each other, and a respective throughput of the nozzle moistener (22) being composed of a proportion for influencing the cross-machine moisture profile and a proportion for influencing the curl, characterized in that the proportion for influencing the curl, provided as a base load, lies or can be adjusted in a range between 10 and 50% of the total throughput.
  2. Equipment according to Claim 1, characterized in that the nozzle moistener (22) is provided with pneumatic atomizer nozzles.
  3. Equipment according to one of the preceding claims, characterized in that the nozzle moistener (22) is provided with two-material nozzles (26).
  4. Equipment according to one of the preceding claims, characterized in that the average throughput of the nozzles (26) of the nozzle moistener (22), determined from the total throughput of the nozzles (26) divided by their number, is ≥ 15 l/h.
  5. Equipment according to Claim 4, characterized in that the average throughput of the nozzles (26) of the nozzle moistener (22) lies in a range from 15 l/h to 30 l/h, preferably in a range from 15 l/h to 20 l/h.
  6. Equipment according to one of the preceding claims, characterized in that, in each spray jet (28) produced by the nozzle moistener (22), the droplet diameter according to Sauter is ≤ 100 µm, regardless of the respective nozzle throughput.
  7. Equipment according to one of the preceding claims, characterized in that, during the operation, the average nozzle throughput is kept at least substantially constant.
  8. Equipment according to one of the preceding claims, characterized in that the proportion for influencing the curl, provided as the base load, can be adjusted differently section by section over the web width.
  9. Equipment according to one of Claims 1 to 7, characterized in that the proportion for influencing the curl, provided as the base load, is constant over the web width.
  10. Equipment according to one of the preceding claims, characterized in that the capacity of the nozzle moistener (22) is chosen to be sufficiently high that, in spite of a base load for the curl, there is sufficient potential for influencing the cross-machine moisture profile.
  11. Equipment according to one of the preceding claims, characterized in that the proportion of the average throughput of the nozzles relating to influencing the curl is ≥ 2 l/h, in particular ≥ 3 l/h and preferably ≥ 4 l/h.
  12. Equipment according to one of the preceding claims, characterized in that the nozzle moistener (22) comprises a plurality of rows of nozzles (26) in each case extending transversely with respect to the web running direction (L).
  13. Equipment according to Claim 12, characterized in that two or four rows of nozzles (26) are provided.
  14. Equipment according to Claim 12, characterized in that five, six, seven or eight and preferably six or eight rows of nozzles (26) are provided.
  15. Equipment according to one of the preceding claims, characterized in that all the nozzles (26) of the nozzle moistener (22) are used simultaneously both to influence the cross-machine moisture profile and to influence the curl of the fibrous web (12).
  16. Equipment according to one of Claims 1 to 14, characterized in that some of the nozzles (26) of the nozzle moistener (22) are used exclusively to influence the cross-machine moisture profile, and some of the nozzles (26) are used exclusively to influence the curl.
  17. Equipment according to one of Claims 1 to 14, characterized in that some of the nozzles (26) of the nozzle moistener (22) are used simultaneously both to influence the cross-machine moisture profile and to influence the curl of the fibrous web (12), and some of the nozzles (26) are used exclusively to influence the curl.
  18. Equipment according to one of Claims 1 to 14, characterized in that some of the nozzles (26) of the nozzle moistener (22) are used simultaneously both to influence the cross-machine moisture profile and to influence the curl of the fibrous web (12), and some of the nozzles (26) are used exclusively to influence the cross-machine moisture profile.
  19. Equipment according to one of the preceding claims, characterized in that the volume of spray discharged by the nozzle moistener (22) in order to influence the cross-machine moisture profile can be adjusted separately section by section as viewed in the transverse direction.
  20. Equipment according to Claim 16, characterized in that a plurality of rows of nozzles are provided and each nozzle can be adjusted individually.
  21. Equipment according to one of the preceding claims, characterized in that at least one closed and/or open control loop (34) is provided, at least in order to influence the cross-machine moisture profile.
  22. Equipment according to one of the preceding claims, characterized in that the closed-loop or open-loop control of the influence on the curl is carried out as a function of the average web moisture and in particular the magnitude of the curl determined in the laboratory test.
  23. Equipment according to one of the preceding claims, characterized in that the nozzle moistener (22) is arranged in a region in which the dryness of the fibrous web is ≥ 80% and preferably ≥ 85%.
  24. Equipment according to one of the preceding claims, characterized in that the sectioning or zonal division is variable.
  25. Equipment according to Claim 24, characterized in that the zone width can be varied in a range between 25 and 100 mm.
  26. Equipment according to one of the preceding claims, characterized in that the nozzle moistener (22) is arranged underneath the lower rolls within a single-row drying group.
  27. Equipment according to one of the preceding claims, characterized in that the nozzle moistener (22) is installed on the last suction roll of the last or penultimate drying group.
  28. Equipment according to one of the preceding claims, characterized in that a steam blower box is provided in order to exert an additional influence on the curl or the flatness and the surface finish of the fibrous web before or within a calendering device following the drying section.
  29. Use of the equipment (10) according to one of the preceding claims in a papermaking process having completely or partly one-sided drying of the paper or board or having one-sided surface treatment, for example sizing or coating, or having an asymmetrical layer structure.
  30. Method for producing and/or treating a fibrous web, in particular a paper or board web, in which, in order to influence the cross-machine moisture profile and to influence the curl of the fibrous web, use is made of a common nozzle moistener (22), via which the cross-machine moisture profile and the curl can be influenced separately from each other, and a respective throughput of the nozzle moistener (22) being composed of a proportion for influencing the cross-machine moisture profile and a proportion for influencing the curl, characterized in that the proportion for influencing the curl, provided as a base load, lies or can be adjusted in a range between 10 and 50% of the total throughput.
  31. Method according to Claim 30, characterized in that some of the nozzles of the nozzle moistener are used exclusively to influence the cross-machine moisture profile, and some of the nozzles are used exclusively to influence the curl.
  32. Method according to Claim 30, characterized in that some of the nozzles of the nozzle moistener are used simultaneously both to influence the cross-machine moisture profile and to influence the curl of the fibrous web, and some of the nozzles are used exclusively to influence the curl.
  33. Method according to Claim 30, characterized in that some of the nozzles of the nozzle moistener are used simultaneously both to influence the cross-machine moisture profile and to influence the curl of the fibrous web, and some of the nozzles are used exclusively to influence the cross-machine moisture profile.
  34. Method according to one of the preceding Claims 30-33, characterized in that, during the operation, the average nozzle throughput, determined from the total throughput of the nozzles divided by their number, is kept at least substantially constant.
  35. Method according to one of the preceding Claims 30-34, characterized in that the cross-machine moisture profile is influenced in the desired manner via appropriate closed-loop and/or open-loop control.
  36. Method according to one of the preceding Claims 30-35, characterized in that the curl is influenced in the desired manner via appropriate closed-loop and/or open-loop control.
  37. Method according to one of the preceding Claims 30-36, characterized in that the influence on the curl is subjected to open-loop and/or closed-loop control as a function of the average web moisture and in particular the magnitude of the curl determined in the laboratory test.
EP03795022A 2002-09-10 2003-07-28 Device and method for producing and/or treating a fibrous strip Expired - Lifetime EP1540078B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10241944 2002-09-10
DE10241944A DE10241944A1 (en) 2002-09-10 2002-09-10 Papermaking assembly for newsprint and super calendar paper has single device regulating moisture cross-sectional profile and curl
PCT/EP2003/050337 WO2004025023A1 (en) 2002-09-10 2003-07-28 Device and method for producing and/or treating a fibrous strip

Publications (2)

Publication Number Publication Date
EP1540078A1 EP1540078A1 (en) 2005-06-15
EP1540078B1 true EP1540078B1 (en) 2010-09-08

Family

ID=31724613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03795022A Expired - Lifetime EP1540078B1 (en) 2002-09-10 2003-07-28 Device and method for producing and/or treating a fibrous strip

Country Status (7)

Country Link
EP (1) EP1540078B1 (en)
JP (1) JP4514610B2 (en)
CN (1) CN1681994B (en)
AT (1) ATE480665T1 (en)
AU (1) AU2003262541A1 (en)
DE (2) DE10241944A1 (en)
WO (1) WO2004025023A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006008808A1 (en) * 2006-02-25 2007-08-30 Voith Patent Gmbh Method and device for moistening a fibrous web
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
DE102010039093A1 (en) * 2010-08-09 2012-02-09 Voith Patent Gmbh Method and device for controlling the moisture of a material web
US9797096B2 (en) * 2013-09-05 2017-10-24 Mondi Ag Food wrap paper and method of manufacturing same
CN104988787B (en) * 2015-07-08 2017-08-25 华南理工大学 The steam unit and method of a kind of utilization vacuum regulation Paper Moisture

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US3658642A (en) * 1968-12-18 1972-04-25 Beloit Corp Method of reducing curl in making a continuous web of paper
JPS54151605A (en) * 1978-05-16 1979-11-29 Honshu Paper Co Ltd Moisture conditioner for sheet material
JPS59141600U (en) * 1983-03-14 1984-09-21 日立造船富岡機械株式会社 Paper moisture control device for paper machine
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
US5286348A (en) * 1991-10-16 1994-02-15 Valmet Automation (Canada) Ltd. Electronic flow modulated cross direction moisture actuator
FI103820B (en) * 1993-11-30 1999-09-30 Valmet Paper Machinery Inc Procedures for drying a paper web and drying parts for paper machine
US5592751A (en) * 1994-11-23 1997-01-14 Voith Sulzer Papiermaschinen Gmbh Dryer section having combination of single and double tier dryer groups
DE19548307A1 (en) * 1995-12-22 1997-06-26 Voith Sulzer Papiermasch Gmbh Drying section of paper or paper board machine
FI981480A (en) * 1998-06-26 1999-12-27 Valmet Corp Method for controlling paper surface properties and / or curvature and / or tension and / or moisture and / or tension profile and / or humidity profile and arrangement in a papermaking machine for paper surface properties and / or curvature and / or moisture and / or ...
DE19841768A1 (en) * 1998-09-11 2000-03-16 Voith Sulzer Papiertech Patent Dryer section
DE19921592A1 (en) * 1999-05-07 2000-11-09 Voith Sulzer Papiertech Patent Application device and method for a paper machine
FI113072B (en) * 1999-09-29 2004-02-27 Metso Paper Inc Method for multi-roll calender and multi-roll calender
DE19949236C2 (en) * 1999-10-13 2003-05-08 Lechler Gmbh & Co Kg Two-component spray nozzle
DE10055999A1 (en) * 2000-11-11 2002-05-23 Voith Paper Patent Gmbh Press unit to extract water from a wet web, at a press section, has a unit to remove water from a press roller surface and a wetting unit for the roller to set the lateral moisture content profile of the web

Also Published As

Publication number Publication date
ATE480665T1 (en) 2010-09-15
AU2003262541A1 (en) 2004-04-30
WO2004025023A1 (en) 2004-03-25
CN1681994A (en) 2005-10-12
JP2005538267A (en) 2005-12-15
DE10241944A1 (en) 2004-03-18
CN1681994B (en) 2012-05-30
DE50313075D1 (en) 2010-10-21
EP1540078A1 (en) 2005-06-15
JP4514610B2 (en) 2010-07-28

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