EP1593778B1 - Process and apparatus for treating a web of paper or board - Google Patents
Process and apparatus for treating a web of paper or board Download PDFInfo
- Publication number
- EP1593778B1 EP1593778B1 EP05101506A EP05101506A EP1593778B1 EP 1593778 B1 EP1593778 B1 EP 1593778B1 EP 05101506 A EP05101506 A EP 05101506A EP 05101506 A EP05101506 A EP 05101506A EP 1593778 B1 EP1593778 B1 EP 1593778B1
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- European Patent Office
- Prior art keywords
- web
- coating
- shoe
- nip
- roller
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
- D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
- D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/50—Spraying or projecting
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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
- Y10S118/00—Coating apparatus
- Y10S118/04—Curtain coater
Definitions
- the invention relates to a method for treating a web of paper or cardboard, in which a functional line applied to the web and the web is satined satin, the functional line is applied without contact, the web is satin online with the coating job and the calendering in a nip a shoe calender takes place, which has a shoe roll with a circumferential jacket and a counter-roller.
- thermosensitive webs Paper or board webs, which are also referred to below as "webs" for short, are often provided with a line on at least one surface. This line, so a coating, can have different purposes. You can smooth the train. But you can also assign another function to the stroke. For example, you can make the web thermosensitive with the help of the stroke. For example, a thermosensitive web can be used in facsimile machines or other printers that describe the web using locally applied heat.
- the invention has for its object to produce webs with functional rule cost.
- thermosensitive coating the long nip has a length of at least 40 mm and damm one sets a line load of a maximum of 600 N / mm.
- thermosensitive functional coating necessary to meet certain requirements. If the function bar is applied without contact, the layer thickness of the functional bar can be set to a minimum. The forming layer then follows the contour of the surface of the web, ie it is not necessary to compensate for the roughness of the web and to fill in "valleys". This type of coating job saves considerable costs, because you need less coating color. After application of the stroke, all areas of the web are adequately evenly covered with the functional line.
- the compressive stresses acting on the web can be kept so small that the "peaks" due to the roughness of the web will not push through the layer formed by the functional line , Even when using a very thin layer of the functional stroke, the web remains covered over its entire surface with coating color, so that the calender does not negate the previously achieved advantage of contactless coating order again.
- the combination of non-contact coating application and calendering in the nip thus leads to a significant reduction in the need for material for the function bar, in other words, the coating color.
- the web is also satin in a stage in which the functional line has not yet received its final strength. It is therefore still possible, within certain limits, to perform a transformation at least on the surface of the functional bar, without appreciably reducing the thickness of the layer formed by the functional bar.
- a line load of a maximum of 600 N / mm is set. This is sufficient to reduce the roughness of the web to a desired value. On the other hand, at this low line load value, the volume is not appreciably reduced.
- the sheath of the shoe roll of the shoe calender is held stationary and the counter roll is dipped into the sheath.
- This has the advantage that there is no shell stretch and thus no flexing. Accordingly, there is no overheating in the areas of the lateral edge zones. The coat is less stressed. Accordingly, the costs decrease.
- a curtain coater is used to apply the coating.
- a curtain coater is offered by Voith Paper, 89522 Heidenheim, Germany. With a curtain coater, the line can be applied without contact and with a relatively small thickness.
- the web is passed through the nip at a speed in the range of 900 to 1,300 m / min. This speed shows the best calendering result.
- the drawing shows a device 1 for treating a web 2 of paper or cardboard.
- the web comes from a paper or board machine 3 shown only schematically. However, it can also be unwound from a roll, for example a jumbo roll.
- the web 2 passes through a coating device 4, in which a functional line 5 is applied to a surface.
- the coating device 4 is here designed as a "curtain coater", the coating color in the form of a curtain 6 (symbolized by an arrow) run on the web 2.
- a curtain coater By adjusting the amount dispensed to the speed of the web 2, an extremely thin line on the surface of the web 2 can be generated. For the sake of representability of the stroke 5 is shown exaggerated in the drawing.
- the functional bar 5 may be a thermosensitive bar, so that the web 2 ultimately becomes a thermosensitive paper or a thermosensitive carton.
- the line 5 usually contains besides a binder and some secondary constituents two dye precursors, which by reaction with each other in reaction produce a mostly black color.
- the main application areas are fax papers, printer, plotter and label papers.
- the thermo-reactive coating can by a heat-insulating primer, not shown be supported, which can also be applied with a curtain coater.
- the coating device has an output device 7, which applies the line 5, which can also be referred to as a "coating color", to the web 2, and a collecting trough 8, in which laterally excess coating color can be absorbed. In a manner not shown, the coating color from the sump 8 can be returned to the output device 7 again.
- a shoe calender 9 is arranged, which has a shoe roll 10 with a circumferential jacket 11 and a support shoe 12.
- the support shoe 12 has a pressure surface 13, which is provided with non-illustrated means for introducing lubricants, such as hydraulic oil.
- a counter-roller 14 cooperates, which has a plurality of peripheral holes 15 in order to adjust the temperature at the surface of the counter-roller 14 can.
- the counter-roller 14 relative to the shoe roll 10 is displaced.
- the support shoe 12 of the shoe roll 10 is stationary.
- the counter-roller 14 is thus immersed in the shell 11 of the shoe roll 10. This has the advantage that the jacket 11 does not have to be stretched at its axial ends. There it is usually provided with end discs which rotate about an axis 17.
- the shoe roll 10 forms with the counter roll 14 together a Breitnip 18, in which the web 2 with the applied Function bar 5 is satined.
- the temperature in the extended nip 18 is now set to a relatively low value.
- the maximum surface temperature of the backing roll 14 is 60 ° C.
- one will choose the temperature of the counter roll 14 even lower, namely at 40 ° C or only 30 ° C.
- the broad nip 18 has a length of at least 40 mm in the running direction of the web 2. A longer length is preferred. The length can be up to 400 mm. In the broad nip one generates a line load of, for example, 600 N / mm, so that a compressive stress of about 15 N / mm 2 results at a Nipnature of 40 mm. The compressive stress should be chosen so that the volume of the web 2 does not substantially decrease in the extended nip 18, that is, for example, only reduced by 2.5%.
- the web 2 passes through the nip 18 at a speed in the range of 900 to 1,300 m / min. Together with the low temperature and the relatively low compressive stress is achieved so that the functional rule 5 is solidified sufficiently, so that the web 2 receives a good rub resistance.
- the smoothness and gloss values of the web 2 also increase a bit. However, this is not the focus here.
- the illustrated device With the illustrated device to reach an exceptionally thin layer thickness of the bar 5, so that you can make do with a relatively small amount of expensive coating color. Despite this thin layer thickness, the two-dimensional coverage of the web 2 is maintained even when the web 2 is satined in the nip 18 and the coated side of the counter-roller 14, which has a hard and smooth surface rests.
- the jacket 11, however, is softer, i. he is plastically deformable.
- the pressure surface 13 is formed so that it follows the contour of the peripheral surface of the counter-roller 14, taking into account the thickness of the shell 11. But this is not mandatory.
Landscapes
- Paper (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Behandeln einer Bahn aus Papier oder Karton, bei dem ein Funktionsstrich auf die Bahn aufgetragen und die Bahn anschlieβend satiniert wird, wobei der Funktionsstrich berührungslos aufgetragen wird, die Bahn online mit dem Strichauftrag satiniert wird und die Satinage in einem Breitnip eines Schuhkalanders erfolgt, der eine Schuhwalze mit einem umlaufenden Mantel und eine Gegenwalze aufweist.The invention relates to a method for treating a web of paper or cardboard, in which a functional line applied to the web and the web is satined satin, the functional line is applied without contact, the web is satin online with the coating job and the calendering in a nip a shoe calender takes place, which has a shoe roll with a circumferential jacket and a counter-roller.
Papier- oder Kartonbahnen, die im folgenden auch kurz als "Bahn" bezeichnet werden, werden vielfach mit einem Strich an mindestens einer Oberfläche versehen. Dieser Strich, also eine Beschichtung, kann unterschiedliche Zwecke haben. Man kann die Bahn glätten. Man kann dem Strich aber auch eine weitere Funktion zuweisen. Beispielsweise kann man mit Hilfe des Strichs die Bahn thermosensitiv machen. Eine thermosensitive Bahn kann beispielsweise in Telefaxgeräten oder anderen Druckern verwendet werden, die die Bahn mit Hilfe von lokal angewendeter Hitze beschreiben.Paper or board webs, which are also referred to below as "webs" for short, are often provided with a line on at least one surface. This line, so a coating, can have different purposes. You can smooth the train. But you can also assign another function to the stroke. For example, you can make the web thermosensitive with the help of the stroke. For example, a thermosensitive web can be used in facsimile machines or other printers that describe the web using locally applied heat.
Aus der
Der Erfindung liegt die Aufgabe zugrunde, Bahnen mit Funktionsstrich kostengünstig herzustellen.The invention has for its object to produce webs with functional rule cost.
Diese Aufgabe wird dadurch gelöst, dass man einen thermosensitiven Strich aufträgt, der Breitnip eine Länge von mindestens 40 mm hat und damm man eine Streckenlast von maximal 600 N/mm einstellt.This object is achieved by applying a thermosensitive coating, the long nip has a length of at least 40 mm and damm one sets a line load of a maximum of 600 N / mm.
Durch diese Kombination läßt sich überraschenderweise die Menge des thermosensitiven Funktionsstrichs, die zur Erfüllung bestimmter Anforderungen notwendig ist, erheblich reduzieren. Wenn der Funktionsstrich berührungslos aufgetragen wird, kann man die Schichtdicke des Funktionsstrichs auf ein Minimum einstellen. Die sich ausbildende Schicht folgt dann der Kontur der Oberfläche der Bahn, d.h. es ist nicht notwendig, die Rauhigkeit der Bahn auszugleichen und "Täler" auszufüllen. Diese Art des Strichauftrags spart also erhebliche Kosten, weil man weniger Streichfarbe benötigt. Nach dem Auftragen des Strichs sind alle Bereiche der Bahn in ausreichendem Maße gleichmäßig mit dem Funktionsstrich bedeckt. Dadurch, daß die Bahn anschließend nicht in einem "normalen" Kalander satiniert wird, bei dem zwei Walzen zusammenwirken, sondern in einem Schuhkalander, der in Laufrichtung der Bahn einen relativ langen Nip aufweist, erfolgt eine Satinage, bei der die Bahn eine gewisse Scheuerfestigkeit erhält. Es ist nicht erforderlich, daß die Bahn auf Glätte oder Glanz satiniert wird, wenngleich sich hier gewisse vorteilhafte Effekte einstellen. Man nimmt an, daß durch die Verwendung eines Breitnips die Druckspannungen, die auf die Bahn wirken, so klein gehalten werden können, daß sich die "Spitzen", die aufgrund der Rauhigkeit der Bahn vorhanden sind, nicht durch die durch den Funktionsstrich gebildete Schicht hindurchdrücken. Auch bei der Verwendung einer sehr dünnen Schicht des Funktionsstrichs bleibt die Bahn über ihre volle Fläche mit Streichfarbe bedeckt, so daß die Satinage den zuvor erreichten Vorteil des berührungslosen Strichauftrags nicht wieder zunichte macht. Die Kombination aus berührungslosem Strichauftrag und Satinage im Breitnip führt also zu einer erheblichen Verminderung des Bedarfs an Material für den Funktionsstrich, mit anderen Worten, der Streichfarbe. Wenn man nun die Satinage online mit dem Strichauftrag vornimmt, dann erreicht man nicht nur Einsparungen bei der Handhabung. Die Bahn wird auch in einem Stadium satiniert, in dem der Funktionsstrich noch nicht seine endgültige Festigkeit erhalten hat. Es ist also in gewissen Grenzen noch möglich, eine Umformung zumindest an der Oberfläche des Funktionsstrichs vorzunehmen, ohne die Dicke der durch den Funktionsstrich gebildeten Schicht nennenswert zu vermindern.This combination can surprisingly significantly reduce the amount of thermosensitive functional coating necessary to meet certain requirements. If the function bar is applied without contact, the layer thickness of the functional bar can be set to a minimum. The forming layer then follows the contour of the surface of the web, ie it is not necessary to compensate for the roughness of the web and to fill in "valleys". This type of coating job saves considerable costs, because you need less coating color. After application of the stroke, all areas of the web are adequately evenly covered with the functional line. The fact that the web is then not calendered in a "normal" calender, in which two rollers cooperate, but in a shoe calender, which has a relatively long nip in the direction of the web, takes place a calendering, in which the web receives a certain abrasion resistance , It is not necessary that the web is calendered for smoothness or gloss, although here are some advantageous Set effects. It is believed that by using a broad nip, the compressive stresses acting on the web can be kept so small that the "peaks" due to the roughness of the web will not push through the layer formed by the functional line , Even when using a very thin layer of the functional stroke, the web remains covered over its entire surface with coating color, so that the calender does not negate the previously achieved advantage of contactless coating order again. The combination of non-contact coating application and calendering in the nip thus leads to a significant reduction in the need for material for the function bar, in other words, the coating color. Now, if you do the calendering online with the stroke order, then you will not only achieve savings in handling. The web is also satin in a stage in which the functional line has not yet received its final strength. It is therefore still possible, within certain limits, to perform a transformation at least on the surface of the functional bar, without appreciably reducing the thickness of the layer formed by the functional bar.
Vorzugsweise hält man eine Temperatur im Breitnip unter 60°C. Der Schuhkalander wird also "kalt" gefahren. Dies ist ungewöhnlich, weil Schuhkalander im Grunde immer bei relativ hohen Temperaturen betrieben werden. Es hat sich aber gezeigt, daß bei den relativ niedrigen Temperaturen, die sogar noch weit unter 60°C liegen können, beispielsweise bei 40°C oder sogar 30°C, die Satinage der Bahn ausreicht, um die gewünschten Eigenschaften zu erzielen. Insbesondere bekommt die Bahn eine ausreichende Scheuerfestigkeit.It is preferable to maintain a temperature in the nip below 60 ° C. The shoe calender is therefore driven "cold". This is unusual because shoe calenders are basically always operated at relatively high temperatures. However, it has been shown that at the relatively low temperatures, which may even be well below 60 ° C, for example at 40 ° C or even 30 ° C, the calendering of the web is sufficient to the desired properties achieve. In particular, the web gets a sufficient rub resistance.
Man stellt bei einer Länge des Breitnips von mindestens 40 mm eine Streckenlast von maximal 600 N/mm ein. Dies reicht aus, um die Rauhigkeit der Bahn auf einen gewünschten Wert zu vermindern. Andererseits wird bei diesem niedrigen Wert der Streckenlast das Volumen nicht nennenswert vermindert.With a length of the wide nip of at least 40 mm, a line load of a maximum of 600 N / mm is set. This is sufficient to reduce the roughness of the web to a desired value. On the other hand, at this low line load value, the volume is not appreciably reduced.
Vorzugsweise hält man den Mantel der Schuhwalze des Schuhkalanders stationär und taucht die Gegenwalze in den Mantel ein. Dies hat den Vorteil, daß sich keine Manteldehnung ergibt und damit auch keine Walkarbeit. Dementsprechend ergibt sich in den Bereichen der seitlichen Randzonen auch keine Überhitzung. Der Mantel wird weniger stark beansprucht. Dementsprechend sinken die Kosten.Preferably, the sheath of the shoe roll of the shoe calender is held stationary and the counter roll is dipped into the sheath. This has the advantage that there is no shell stretch and thus no flexing. Accordingly, there is no overheating in the areas of the lateral edge zones. The coat is less stressed. Accordingly, the costs decrease.
Bevorzugterweise verwendet man zum Auftragen des Strichs einen Curtain Coater. Ein Curtain Coater wird beispielsweise von Voith Paper, 89522 Heidenheim, Deutschland, angeboten. Mit einem Curtain Coater läßt sich der Strich berührungslos und mit einer relativ geringen Dicke auftragen.Preferably, a curtain coater is used to apply the coating. For example, a curtain coater is offered by Voith Paper, 89522 Heidenheim, Germany. With a curtain coater, the line can be applied without contact and with a relatively small thickness.
Bevorzugterweise führt man die Bahn mit einer Geschwindigkeit im Bereich von 900 bis 1.300 m/min durch den Breitnip. Bei dieser Geschwindigkeit zeigt sich das beste Satinageergebnis.Preferably, the web is passed through the nip at a speed in the range of 900 to 1,300 m / min. This speed shows the best calendering result.
Auch ist von Vorteil, wenn man im Breitnip eine Druckspannung wählt, bei der die Dicke der Bahn um maximal 2,5 % abnimmt. Damit läßt sich ein volumenschonendes Satinieren erreichen.It is also advantageous if one chooses a compressive stress in the nip, in which the thickness of the web by a maximum 2.5% decreases. This can achieve a volume gentle satin finish.
Die Zeichnung zeigt eine Vorrichtung 1 zum Behandeln einer Bahn 2 aus Papier oder Karton. Die Bahn kommt aus einer nur schematisch dargestellten Papier- oder Kartonmaschine 3. Sie kann stattdessen aber auch von einer Rolle, beispielsweise einer Jumborolle, abgewickelt werden.The drawing shows a device 1 for treating a
Die Bahn 2 durchläuft eine Streicheinrichtung 4, in der ein Funktionsstrich 5 auf eine Oberfläche aufgetragen wird. Die Streicheinrichtung 4 ist hier als "Curtain Coater" ausgebildet, der Streichfarbe in Form eines Vorhanges 6 (durch einen Pfeil symbolisiert) auf die Bahn 2 laufen läßt. Durch eine Abstimmung der ausgegebenen Menge auf die Geschwindigkeit der Bahn 2 läßt sich ein außerordentlich dünner Strich auf der Oberfläche der Bahn 2 erzeugen. Aus Gründen der Darstellbarkeit ist der Strich 5 in der Zeichnung übertrieben dick dargestellt.The
Bei dem Funktionsstrich 5 kann es sich beispielsweise um einen thermosensitiven Strich handeln, so daß die Bahn 2 letztendlich ein thermosensitives Papier oder ein thermosensitiver Karton wird. Der Strich 5 enthält dabei üblicherweise außer einem Bindemittel und einigen Nebenbestandteilen zwei Farbstoffvorläufer, die durch Schmelze miteinander in Reaktion gebracht eine meist schwarze Farbe erzeugen. Die wesentlichen Anwendungsgebiete sind Telefaxpapiere, Printer-, Plotter- und Etikettenpapiere. Der thermoreaktive Strich kann durch einen nicht näher dargestellten wärmeisolierenden Vorstrich unterstützt werden, der ebenfalls mit einem Curtain Coater aufgebracht werden kann.For example, the
Die Streicheinrichtung weist eine Ausgabeeinrichtung 7 auf, die den Strich 5, der auch als "Streichfarbe" bezeichnet werden kann, auf die Bahn 2 aufträgt, und eine Auffangwanne 8, in der seitlich überschießende Streichfarbe aufgenommen werden kann. In nicht näher dargestellter Weise kann die Streichfarbe aus der Auffangwanne 8 wieder zur Ausgabeeinrichtung 7 zurückgeführt werden.The coating device has an output device 7, which applies the
Online zur Streicheinrichtung 4 ist ein Schuhkalander 9 angeordnet, der eine Schuhwalze 10 mit einem umlaufenden Mantel 11 und einem Stützschuh 12 aufweist. Der Stützschuh 12 weist eine Andruckfläche 13 auf, die mit nicht näher dargestellten Einrichtungen zum Einbringen von Schmiermitteln versehen ist, beispielsweise Hydrauliköl. Mit dem Mantel 11 der Schuhwalze 10 wirkt eine Gegenwalze 14 zusammen, die eine Vielzahl von peripheren Bohrungen 15 aufweist, um die Temperatur an der Oberfläche der Gegenwalze 14 einstellen zu können. Wie durch einen Doppelpfeil 16 angedeutet, ist die Gegenwalze 14 gegenüber der Schuhwalze 10 verlagerbar. Der Stützschuh 12 der Schuhwalze 10 ist stationär angeordnet. Die Gegenwalze 14 wird also in den Mantel 11 der Schuhwalze 10 eingetaucht. Dies hat den Vorteil, daß der Mantel 11 an seinen axialen Enden nicht gedehnt werden muß. Dort ist er üblicherweise mit Stirnscheiben versehen, die um eine Achse 17 rotieren.Online to the
Die Schuhwalze 10 bildet mit der Gegenwalze 14 zusammen einen Breitnip 18, in dem die Bahn 2 mit dem aufgetragenen Funktionsstrich 5 satiniert wird. Man stellt nun die Temperatur im Breitnip 18 auf einen relativ niedrigen Wert ein. Die maximale Oberflächentemperatur der Gegenwalze 14 beträgt 60°C. Um dies zu erreichen, kann es notwendig sein, die peripheren Bohrungen 15 von einem etwas kälteren Medium durchströmen zu lassen, die Gegenwalze 14 also zu kühlen. Dies hängt davon ab, wie heiß die Bahn 2 ist und welche Temperaturerhöhung sich durch die Beaufschlagung der Bahn 2 im Breitnip 18 ergibt. Vorzugsweise wird man die Temperatur der Gegenwalze 14 sogar noch niedriger wählen, nämlich bei 40°C oder nur 30°C.The
Der Breitnip 18 hat in Laufrichtung der Bahn 2 eine Länge von mindestens 40 mm. Eine größere Länge ist bevorzugt. Die Länge kann bis zu 400 mm betragen. Im Breitnip erzeugt man eine Streckenlast von beispielsweise 600 N/mm, so daß sich eine Druckspannung von etwa 15 N/mm2 bei einer Niplänge von 40 mm ergibt. Die Druckspannung sollte so gewählt werden, daß das Volumen der Bahn 2 im Breitnip 18 nicht wesentlich abnimmt, also beispielsweise nur um 2,5 % vermindert wird.The
Die Bahn 2 durchläuft den Breitnip 18 mit einer Geschwindigkeit im Bereich von 900 bis 1.300 m/min. Zusammen mit der niedrigen Temperatur und der relativ geringen Druckspannung erreicht man damit, daß der Funktionsstrich 5 in ausreichendem Maße verfestigt wird, so daß die Bahn 2 eine gute Scheuerfestigkeit erhält. Die Glätte- und Glanzwerte der Bahn 2 steigen zwar ebenfalls etwas an. Dies steht jedoch hier nicht im Vordergrund.The
Mit der dargestellten Vorrichtung erreicht man eine auβerordentlich dünne Schichtdicke des Strichs 5, so daß man mit einer relativ geringen Menge der teuren Streichfarbe auskommt. Trotz dieser dünnen Schichtdicke bleibt die flächige Abdeckung der Bahn 2 auch dann erhalten, wenn die Bahn 2 im Breitnip 18 satiniert wird und die gestrichene Seite an der Gegenwalze 14, die eine harte und glatte Oberfläche aufweist, anliegt. Der Mantel 11 ist hingegen weicher ausgebildet, d.h. er ist plastisch verformbar.With the illustrated device to reach an exceptionally thin layer thickness of the
Es ist vorteilhaft, wenn die Andruckfläche 13 so ausgebildet ist, daß sie unter Berücksichtigung der Dicke des Mantels 11 der Kontur der Umfangsfläche der Gegenwalze 14 folgt. Dies ist aber nicht zwingend erforderlich. It is advantageous if the
Claims (6)
- Method for treating a web (2) of paper or board, in which a functional coating (5) is applied to the web (2) and the web (2) is then calendered, the functional coating (5) being applied without direct contact, the web (2) being calendered online in conjunction with the application of the coating, and calendering taking place in a broad nip (18) in a shoe calender (9), which exhibits a shoe roller (10) with a rotating outer cover (11) and a squeeze roller (14), characterized in that a thermosensitive coating is applied, the broad nip has a length of at least 40 mm and in that a line load not exceeding 600 N/mm is set.
- Method according to Claim 1, characterized in that a temperature of less than 60°C is maintained in the broad nip (18).
- Method according to one or other of Claims 1-2, characterized in that the outer cover (11) of the shoe roller (10) of the shoe calender (9) is held stationary, and the squeeze roller (14) is lowered into the outer cover (11).
- Method according to one or other of Claims 1-3, characterized in that a Curtain Coater (4) is used to apply the coating (5).
- Method according to one or other of Claims 1-4, characterized in that the web (2) is passed through the broad nip (18) at a speed in the range from 900 to 1,300 m/min.
- Method according to one or other of Claims 1-5, characterized in that a compressive stress is selected in the broad nip (18), at which the thickness of the web (2) is reduced by a maximum of 2.5%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004022416A DE102004022416B4 (en) | 2004-05-06 | 2004-05-06 | Method and device for treating a web of paper or cardboard |
| DE102004022416 | 2004-05-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1593778A1 EP1593778A1 (en) | 2005-11-09 |
| EP1593778B1 true EP1593778B1 (en) | 2011-10-05 |
Family
ID=34938836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05101506A Active EP1593778B1 (en) | 2004-05-06 | 2005-02-28 | Process and apparatus for treating a web of paper or board |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7422659B2 (en) |
| EP (1) | EP1593778B1 (en) |
| DE (1) | DE102004022416B4 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004029261B4 (en) † | 2004-06-17 | 2006-05-18 | Papierfabrik August Koehler Ag | A process for producing a thermosensitive recording material and a recording material prepared by the process |
| DE102005028822A1 (en) * | 2005-06-22 | 2007-01-04 | Voith Patent Gmbh | Process for producing thermosensitive paper |
| DE102008041419A1 (en) * | 2008-08-21 | 2010-02-25 | Voith Patent Gmbh | Apparatus for producing coated paper, board or other fibrous webs with at least one thermosensitive layer and method for operating such a device |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI108061B (en) * | 1995-10-05 | 2001-11-15 | Metso Paper Inc | Method for coating a paper or cardboard web |
| FI115649B (en) * | 1998-06-10 | 2005-06-15 | Metso Paper Inc | Method of making paper and paper machine |
| SE9804346D0 (en) * | 1998-12-16 | 1998-12-16 | Valmet Corp | Method and apparatus for calendering paper |
| FI991096A (en) * | 1999-05-12 | 2000-11-13 | Valmet Corp | A process for producing paper, in particular fine paper, and a paper machine line, in particular for producing fine paper |
| FI991108A (en) * | 1999-05-14 | 2000-11-15 | Valmet Corp | Method and apparatus for the manufacture of calendered paper or calendered paperboard |
| DE10057729A1 (en) * | 2000-11-22 | 2002-05-23 | Voith Paper Patent Gmbh | Web coating station, has two applicators, to deliver the coatings as falling curtains, with different coating media and a structured gap between the strike points of each at the moving substrate for the overlaid layers |
| EP1249533A1 (en) * | 2001-04-14 | 2002-10-16 | The Dow Chemical Company | Process for making multilayer coated paper or paperboard |
| FI20011291A (en) * | 2001-06-18 | 2002-12-19 | Metso Paper Inc | Process and paper machine for making coated paper |
| FI111281B (en) * | 2001-12-12 | 2003-06-30 | Metso Paper Inc | Cardboard finishing procedure |
| US20050098285A1 (en) * | 2002-06-24 | 2005-05-12 | Richard Aust | Machine for making/treating a sheet of material |
| DE20221930U1 (en) * | 2002-06-24 | 2009-05-20 | Voith Patent Gmbh | Machine for the treatment of a material web, preferably of paper and cardboard, and optionally for the preparation of the preparation of the material web, with a contactless application device and a material web smoothing device |
| FI20025051A0 (en) * | 2002-11-27 | 2002-11-27 | Metso Paper Inc | LWC paper and process for its production |
| US20050037158A1 (en) * | 2003-08-12 | 2005-02-17 | Yaoliang Hong | Method of making glossy ink jet media using sub-micron silica coating and calendering process |
-
2004
- 2004-05-06 DE DE102004022416A patent/DE102004022416B4/en not_active Withdrawn - After Issue
-
2005
- 2005-02-28 EP EP05101506A patent/EP1593778B1/en active Active
- 2005-05-04 US US11/122,955 patent/US7422659B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004022416B4 (en) | 2013-02-21 |
| US20050257906A1 (en) | 2005-11-24 |
| US7422659B2 (en) | 2008-09-09 |
| DE102004022416A1 (en) | 2005-12-15 |
| EP1593778A1 (en) | 2005-11-09 |
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