EP1739228B1 - Machine for manufacturing a fibrous web - Google Patents
Machine for manufacturing a fibrous web Download PDFInfo
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- EP1739228B1 EP1739228B1 EP06115709A EP06115709A EP1739228B1 EP 1739228 B1 EP1739228 B1 EP 1739228B1 EP 06115709 A EP06115709 A EP 06115709A EP 06115709 A EP06115709 A EP 06115709A EP 1739228 B1 EP1739228 B1 EP 1739228B1
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- European Patent Office
- Prior art keywords
- machine according
- press
- roll
- transfer
- belt
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
Definitions
- the invention relates to a machine for producing a paper or another fibrous web with a press section according to the preamble of present claim 1.
- the press section has two pressing points, which are each formed by a press roller cooperating with a shoe press roll.
- a first upper felt, the paper web coming from a forming wire, an underfelt and a press jacket of a first shoe press roll pass through the first press point.
- the underfelt continues with the paper web to the second press site. Together with a second top felt and a press jacket of a second press site, the paper web then passes through the second press site.
- the paper web follows the underfelt further up to a take-off roll, through which it is transferred to a first dryer wire which transfers the paper web to the dryer section.
- Guide rollers and suction rollers are provided for deflecting the upper felt and the lower felt.
- a press section for a paper machine in which a central roller ( Fig. 1 ) is used, which cooperates in two press nips with a press roll and a shoe press roll.
- a central roller Fig. 1
- the fibrous web is guided on both sides: in the first press nip by a felt and a transfer belt, in the second press nip by the transfer belt and another band.
- SC super calendered
- roll-blade shapers i. H. Screen former with a forming roller and drainage strips, without flexible strips in conjunction with a downstream conventional press section built with three press nips.
- the press nips can also be formed by shoe press rolls.
- a free-standing press unit is preferably arranged for a fourth press nip.
- the fibrous web is smoothed by at least two calenders with a plurality of nips (multinip calenders). The calenders follow the speed of calendering paper machine production.
- the fibrous web is usually dried in the dryer section to a residual moisture content of 2 to 3% and moistened before the reeling station still within the paper machine with the help of a water applicator, such as a nozzle moistener.
- the residence time of the wound with the paper web of the after winding in the paper machine to the calendering of the paper web in the calenders is between 0.5 and 2 hours. Thanks to the drying out and the long dwell time, a very good moisture distribution in all directions within the paper web can be assumed.
- a roll-blade former with or without flexible twin-mesh bars is used in conjunction with two freestanding shoe presses or a freestanding roller press and a subsequent shoe press in conjunction with a multi-pin calender.
- a roll-blade former with or without flexible strips in the twin-wire area and a conventional three-nip press with or without Schuhnip used in conjunction with a multi-pin calender.
- productivity in an online process can be significantly higher due to the loss of rewinding losses caused by winding, unwinding, and rewinding the web after calendering.
- a conventional press section which is designed as a three-nip press without an additional free-standing fourth press generally shows a very strong structure two-sidedness of the paper due to asymmetric dewatering conditions in the press, as in the second and third press nip the dewatering takes place only to the top.
- the dry content may indeed be increased significantly, which generally leads to a higher speed and consequently also to a higher productivity.
- the heavier dewatering to the top further increases paper two-sidedness. Therefore, for high quality papers a free-standing fourth press with drainage reversal to the bottom is absolutely necessary.
- the disadvantage of this concept is that the paper web must be conveyed over two areas in the open draw. It runs freely between the central roll after the third press and from the fourth press. This has a negative impact on the runnability of the paper web. The paper web overstretches. It can tears and transverse contractions occur, which significantly reduce the maximum speed potential.
- the line force generated in the first press nip formed by the first press roll and the central roll is at most 50kN / m, preferably at most 30kN / m.
- the fibrous web 1 is transferred to the transfer belt 10 in the region of the press nip 9 gently.
- the paper web For further mechanical dewatering after the wire section, the paper web, supported and guided by press felts or impermeable or permeable transfer belts, passes through several press nips formed by pairs of rolls. Due to the intensive contact of the paper web with the felt surface in the press nip, it is necessary for high-quality papers, each paper side the final contact with a smooth roller or a smooth transfer belt to enable. This smoothing takes place in a conventional press section with or without Schuhnip on the central roll and for the upper side in a subsequent press in which the paper web passes through a fourth press nip.
- the operation of a shoe tip in the third press nip can increase the dry content compared to conventional roll nips by up to four percent. However, this positive effect is at the expense of the surface quality and thus the printability, in particular the felt-contacting surface of the paper web.
- the first press nip may be formed as a Schuhnip to further increase the dry content.
- SC papers high-quality uncoated magazine papers
- a fourth press nip is essential, with the paper web being led through the press nip together with an underfelt for smoothing.
- This nip can also be used as a Schuhnip with extended residence time to enhance the smoothness effect.
- the transfer suction roll advantageously has a rubberized mantle surface. It may also have a drilling pattern in its roll shell.
- the roller can be variably adjusted in its immersion depth with respect to the paper web and the transfer belt.
- an adjusting device is provided, by means of which the roller is movable.
- novel press felts can be used in all positions.
- An extremely fine surface of the press felts is due to the use of a certain amount of molten fiber material. By this measure, the negative appearing felt marks are drastically reduced.
- the advantages of the invention are that highest production speeds due to the achievement of maximum dry contents after passing through the wire section and the press section and as a result of minimizing the free draws in the press section by the use of the transfer belt are possible. Due to the wet smoothness effect in the press section on both sides of the paper web also a gentle calendering is possible. By means of the press section constructed according to the invention, best printability properties, especially for gravure printing, are achieved on account of improved topography properties of the base paper.
- the transfer belt preferably has a smooth surface and is in particular water-impermeable.
- the transfer belt can also be at least light permeable to air. The ventilation caused thereby improves the web picking behavior.
- the fourth press nip is formed on a separate press.
- the upper roller of the fourth press is formed in particular with a smooth surface.
- the fibrous web coming from the compact press forming the first three press nips has a roughness two-sidedness, since the upper side is rougher than its lower side.
- the decrease of the fibrous web from the smooth roll in the fourth press can be effected by a suction element, in particular a suction roll.
- the suction roll preferably has a porous cover, more preferably a soft, felt-like cover.
- a good web removal from the suction element results according to a further embodiment of the invention by a further suction roll.
- This is preferably wrapped by the dryer fabric of a subsequent dryer section, so that the fibrous web is transferred directly through the dryer fabric in the dryer section.
- the transfer element for transferring the fibrous web from the transfer belt to the fourth press nip preferably has a soft, in particular air-permeable, reference.
- the cover may be made of plastic or a felt. Hereby a good transfer can be achieved.
- the transfer element is driven. This ensures a safe transfer of the fibrous web become.
- a transfer element can be provided in addition to a transfer suction and a particular air-permeable belt loop.
- a felt belt with a fine pile can be used.
- the web loop in the web-guiding area can be in particular vacuumed, i.
- On the side facing away from the fibrous web are subjected to negative pressure, for example by foils, suction boxes or other known suction devices.
- negative pressure for example by foils, suction boxes or other known suction devices.
- the belt loop can also wrap around several guide rollers. In this case, preferably at least one roller of the belt loop is driven. This results in a larger belt loop for the transmission of the fibrous web with corresponding advantages.
- the upper roller of the fourth press nip is wrapped in a further embodiment of the invention with a smoothing belt.
- the smoothing surface can be easily changed by changing the band. For example, this may be necessary to optimize the web delivery performance of smooth surfaces.
- the smoothing strip in particular has a smooth surface.
- the smoothing tape may be dense or permeable to air.
- the smoothing belt can basically be designed like the transfer belt. In particular, all three bands, smoothing belt, transfer belt and belt of the belt loop, can be made equal. This results in a uniform treatment of the fibrous web.
- the arrangement is such that the transfer of the fibrous web through the transfer element takes place directly in the region of the free felt train of the fourth press.
- a suction element for better Bahnabgabe or railway recording be provided in the transfer area in the felt loop. Space can be saved thanks to the direct rail transfer.
- the production is simplified.
- the transfer element can also have at least two vacuum zones, specifically a pickup zone and a holding zone.
- the vacuum in the pickup zone is preferably higher than that in the holding zone. This allows a particularly good and yet gentle web transfer can be achieved.
- the second press nip 9 can be operated such that the line force generated is a maximum of 50 kN / m, preferably a maximum of 30 kN / m.
- This very low line force also called “kissing contact” becomes a gentle one
- Treatment of the fibrous web in the second press nip 9 ensures the press section, wherein the "kissing contact” is essentially there to transfer the fibrous web 1 from the Squeeze roll 5 to the central roll 8.
- the "Kissing Contact” operation can of course also be applied to all embodiments described in the following figures.
- a transfer belt 10 is passed together with the fibrous web 1 through the press nip 9. Subsequently, the top felt 3 is led away from the press suction roll 5.
- the fibrous web 1 is then passed together with the transfer belt 10 and another top felt 11 through a press nip 12 which is formed by the central roll 8 and a shoe press roll 14 equipped with a shoe press zone 13.
- the fibrous web 1 is sucked off by a transfer suction roll 15 from the transfer belt 10 and transferred by means of another transfer suction roll 16 onto a lower felt 17. Thereafter, the fibrous web 1 is passed together with the lower felt 17 through the belonging to a free-standing press unit press rollers 18, 19, which together form a fourth press nip 20.
- the upper roller 19 of the fourth press nip 20 has a smooth surface. From this roller 19, the fibrous web 1 is removed by means of a suction roller 21 with a porous, preferably soft cover. From the roller 21, in turn, the fibrous web is removed by a suction roller 22. The suction roll 22 is thereby looped by a drying wire 23 of the subsequent drying section, of which two drying cylinders 24 and 25 and a duo stabilizer 26 are shown. Instead of the Duostabilisators also a HiDryer can be used.
- Fig. 2 is largely consistent with that of Fig. 1 match.
- the third press nip 12 is designed as a shoe press nip.
- the transfer suction roll 15 is replaced by a belt loop 27, which is formed in particular by an air-permeable felt with fine pile.
- the belt loop 27 is guided over a suction roll 28 and a driven roll 29.
- suction elements 30 may be arranged. These are, for example, foils, suction boxes or other suction devices known in paper technology.
- the variant of Fig. 3 agrees with the variant of Fig. 2 largely coincide. Unlike the variant of Fig. 2 is in the variant of Fig. 3 However, the upper roller 19 of the fourth press nip 20 looped around with a smoothing belt 31.
- This smoothing belt 31 in particular has a smooth surface and may be dense or permeable to air.
- the smoothing belt 31 may be formed like the transfer belt 10.
- the band of the belt loop 27 may be formed in the same way.
- rollers 6 forming the first press nip 4 may also comprise a shoe press unit 7.
- the variant of Fig. 4 again largely agrees with the variant of Fig. 1 match.
- the difference is that the fibrous web 1 is transferred by the transfer suction roll 15 directly in the region of the free felt train of the felt 17 of the fourth press 18, 19 to this.
- the transfer area can be provided in the felt loop 17, a suction element 32 for better web recording or delivery.
- the transfer suction roll 15 has a pickup zone 33 and a holding zone 34, wherein the vacuum in the pickup zone 33 is greater than in the holding zone 34. Basically can also be provided more vacuum zones.
- the transfer belt 10 is also provided with a cleaning device.
- a cleaning device This consists of a spray tube 35, a dirt removal roller 36 and a collecting and collecting device 37th
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- Paper (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
Description
Die Erfindung betrifft eine Maschine zum Herstellen einer Papier- oder einer anderen Faserstoffbahn mit einer Pressenpartie gemäß dem Oberbegriff des vorliegenden Anspruchs 1.The invention relates to a machine for producing a paper or another fibrous web with a press section according to the preamble of present claim 1.
Aus der
Aus der
Als schnelllaufende Papiermaschinen sind für die Erzeugung hochwertiger SC-A-Papier (SC = super calendered) derzeit folgende Konfigurationen ausgeführt: Es werden so genannte Roll-Blade-Former, d. h. Siebformer mit einer Formierwalze und Entwässerungsleisten, ohne flexible Leisten in Verbindung mit einer nachgeordneten konventionellen Pressenpartie mit drei Pressnips gebaut. Die Pressnips können auch von Schuhpresswalzen gebildet werden. Daran anschließend ist vorzugsweise eine freistehende Presseneinheit für einen vierten Pressnip angeordnet. Außerhalb der Papiermaschine wird die Faserstoffbahn durch wenigstens zwei Kalander mit einer Vielzahl von Nips (Multinip-Kalander) geglättet. Die Kalander folgen bei geringerer Satiniergeschwindigkeit der Papiermaschinenproduktion.As high-speed paper machines, the following configurations are currently implemented for the production of high-quality SC-A paper (SC = super calendered): what are known as roll-blade shapers, i. H. Screen former with a forming roller and drainage strips, without flexible strips in conjunction with a downstream conventional press section built with three press nips. The press nips can also be formed by shoe press rolls. Subsequently, a free-standing press unit is preferably arranged for a fourth press nip. Outside the paper machine, the fibrous web is smoothed by at least two calenders with a plurality of nips (multinip calenders). The calenders follow the speed of calendering paper machine production.
Zur Einstellung der benötigten Einlauffeuchte und einer möglichst gleichmäßigen Feuchteverteilung über die gesamte Bahnbreite wird die Faserstoffbahn in der Trockenpartie üblicherweise bis auf eine Restfeuchte von 2 bis 3 % ausgetrocknet und vor der Aufrollstation noch innerhalb der Papiermaschine mit Hilfe eines Wasserauftragsaggregates, beispielsweise eines Düsenfeuchters, aufgefeuchtet. Die Verweilzeit des mit der Papierbahn bewickelten Tambours des nach dem Aufrollen in der Papiermaschine bis zur Satinierung der Papierbahn in den Kalandern beträgt zwischen 0,5 und 2 Stunden. Dank des Austrocknens und der langen Verweilzeit kann von einer sehr guten Feuchteverteilung in allen Richtungen innerhalb der Papierbahn ausgegangen werden.To set the required inlet moisture and the most uniform possible moisture distribution over the entire width of the web, the fibrous web is usually dried in the dryer section to a residual moisture content of 2 to 3% and moistened before the reeling station still within the paper machine with the help of a water applicator, such as a nozzle moistener. The residence time of the wound with the paper web of the after winding in the paper machine to the calendering of the paper web in the calenders is between 0.5 and 2 hours. Thanks to the drying out and the long dwell time, a very good moisture distribution in all directions within the paper web can be assumed.
Die Integration des Multinip-Kalanders in der Papiermaschine (Online-Prozess) hat im allgemeinen eine deutliche Geschwindigkeitssteigerung des Satinageprozesses zur Folge. Aufgrund der kürzeren Verweilzeit im Nip und aufgrund anderer Bahnlaufbedingungen hat der Online-Prozess im Vergleich zum klassischen, oben beschriebenen Offline-Prozess zwar Kostenvorteile; er führt jedoch gleichzeitig zu Qualitätsnachteilen, die sich insbesondere in der Bedruckbarkeit im Tiefdruckverfahren in Form von Druckunruhe und einer höheren Anzahl fehlender Rasterpunkte (missing dots) äußern.The integration of the multinip calender in the paper machine (on-line process) generally results in a significant speed increase of the calendering process. Due to the shorter residence time in the nip and due to other web running conditions, the online process has cost advantages compared to the classic offline process described above; At the same time, however, it leads to quality disadvantages, which manifest themselves in particular in the printability in the gravure printing process in the form of print unrest and a higher number of missing dots (missing dots).
Derartige Online-Prozesse werden auf die folgende Weise ausgeführt: Es kommt ein Roll-Blade-Former mit oder ohne flexible Leisten im Doppelsiebbereich in Verbindung mit zwei freistehenden Schuhpressen oder einer freistehenden Walzenpresse und einer nachfolgenden Schuhpresse in Verbindung mit einem Multinip-Kalander zum Einsatz.Such on-line processes are carried out in the following manner: A roll-blade former with or without flexible twin-mesh bars is used in conjunction with two freestanding shoe presses or a freestanding roller press and a subsequent shoe press in conjunction with a multi-pin calender.
Alternativ wird ein Roll-Blade-Former mit oder ohne flexible Leisten im Doppelsiebbereich und eine konventionelle Drei-Nip-Presse mit oder ohne Schuhnip in Verbindung mit einem Multinip-Kalander eingesetzt.Alternatively, a roll-blade former with or without flexible strips in the twin-wire area and a conventional three-nip press with or without Schuhnip used in conjunction with a multi-pin calender.
Oder es wird ein Roll-Blade-Former ohne flexible Leisten im Doppelsiebbereich und eine konventionelle Drei-Nip-Presse mit oder ohne Schuhnip und einer freistehenden vierten Presse in Verbindung mit einem Multinip-Kalander eingesetzt.Or a roll-blade former without flexible strips in the twin-wire area and a conventional three-nip press with or without Schuhnip and a freestanding fourth press in conjunction with a multi-pin calender used.
Im Vergleich zu einem Offline-Prozess kann die Produktivität in einem Online-Prozess aufgrund der entfallenden Umrollverluste durch das Aufwickeln, das Abwickeln und das nochmalige Aufwickeln der Papierbahn nach dem Kalandrieren deutlich höher liegen.Compared to an offline process, productivity in an online process can be significantly higher due to the loss of rewinding losses caused by winding, unwinding, and rewinding the web after calendering.
Eine konventionelle Pressenpartie, die als Drei-Nip-Presse ohne eine zusätzliche freistehende vierte Presse ausgebildet ist zeigt generell eine sehr starke Strukturzweiseitigkeit des Papiers aufgrund asymmetrischer Entwässerungsverhältnisse in der Presse, da im zweiten und dritten Pressnip die Entwässerung nur zur Oberseite hin erfolgt. Bei Betrieb eines Schuhnips in der dritten Position kann der Trockengehalt zwar deutlich gesteigert werden, was im allgemeinen zu einer höheren Geschwindigkeit und demzufolge auch zu einer höheren Produktivität führt. Allerdings wird durch die stärkere Entwässerung zur Oberseite hin die Papierzweiseitigkeit weiter erhöht. Daher ist für hochwertige Papiere eine freistehende vierte Presse mit Entwässerungsumkehr zur Unterseite unbedingt erforderlich. Der Nachteil dieses Konzepts besteht jedoch darin, dass die Papierbahn über zwei Bereiche im freien Zug gefördert werden muss. Sie läuft frei zwischen der Zentralwalze nach der dritten Presse und von der vierten Presse. Dies hat negative Auswirkungen auf die Lauffähigkeit (Runnability) der Papierbahn. Die Papierbahn überstreckt sich. Es können Einrisse und Querkontraktionen auftreten, die das maximale Geschwindigkeitspotential erheblich reduzieren.A conventional press section, which is designed as a three-nip press without an additional free-standing fourth press generally shows a very strong structure two-sidedness of the paper due to asymmetric dewatering conditions in the press, as in the second and third press nip the dewatering takes place only to the top. When operating a shoe tip in the third position, the dry content may indeed be increased significantly, which generally leads to a higher speed and consequently also to a higher productivity. However, the heavier dewatering to the top further increases paper two-sidedness. Therefore, for high quality papers a free-standing fourth press with drainage reversal to the bottom is absolutely necessary. The disadvantage of this concept, however, is that the paper web must be conveyed over two areas in the open draw. It runs freely between the central roll after the third press and from the fourth press. This has a negative impact on the runnability of the paper web. The paper web overstretches. It can tears and transverse contractions occur, which significantly reduce the maximum speed potential.
Es ist die Aufgabe der Erfindung, eine Maschine zu schaffen, in der die Pressenpartie, insbesondere für hochwertige SC-Papiere, in Hinblick auf die Lauffähigkeit (Runnability), d. h. den Laufzeit- und Materialwirkungsgrad, und die Produktqualität, die Rauhigkeit der Papieroberfläche und die Bedruckbarkeit (Missing Dots) verbessert wird.It is the object of the invention to provide a machine in which the press section, in particular for high quality SC papers, in terms of runnability, d. H. runtime and material efficiency, and product quality, paper surface roughness and missing dots are improved.
Erfindungsgemäß wird diese Aufgabe bei einer Maschine der eingangs genannten Art durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst.According to the invention this object is achieved in a machine of the type mentioned by the features of the characterizing part of claim 1.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen, der Beschreibung und den Zeichnungen enthalten.Advantageous developments of the invention are contained in the subclaims, the description and the drawings.
Vorzugsweise beträgt die in dem durch die erste Presswalze und die Zentralwalze gebildeten ersten Pressnip erzeugte Linienkraft maximal 50kN/m, vorzugsweise maximal 30kN/m. Hierdurch wird die Faserstoffbahn 1 Volumen schonend auf das Transferband 10 im Bereich des Pressnips 9 übergeben.Preferably, the line force generated in the first press nip formed by the first press roll and the central roll is at most 50kN / m, preferably at most 30kN / m. As a result, the fibrous web 1 is transferred to the
Zur weiteren mechanischen Entwässerung nach der Siebpartie läuft die Papierbahn, durch Pressfilze oder impermeable oder permeable Transferbänder gestützt und geführt, durch mehrere Pressnips, die von Walzenpaaren gebildet werden. Aufgrund des intensiven Kontakts der Papierbahn mit der Filzoberfläche im Pressnip ist es bei hochwertigen Papieren erforderlich, jeder Papierseite den abschließenden Kontakt mit einer glatten Walze oder einem glatten Transferband zu ermöglichen. Diese Glättung erfolgt in einer konventionellen Pressenpartie mit oder ohne Schuhnip auf der Zentralwalze sowie für die Oberseite in einer nachfolgenden Presse, in der die Papierbahn einen vierten Pressnip durchläuft.For further mechanical dewatering after the wire section, the paper web, supported and guided by press felts or impermeable or permeable transfer belts, passes through several press nips formed by pairs of rolls. Due to the intensive contact of the paper web with the felt surface in the press nip, it is necessary for high-quality papers, each paper side the final contact with a smooth roller or a smooth transfer belt to enable. This smoothing takes place in a conventional press section with or without Schuhnip on the central roll and for the upper side in a subsequent press in which the paper web passes through a fourth press nip.
In den beiden letzten Pressnips erfolgt bei einem hohen Pressimpuls eine Makroglättung der Oberfläche der Papierbahn, die zu einer verbesserten Kalandrierbarkeit im nachfolgenden Multinip-Kalander führt. Es zeigt sich, dass infolge des Nassglättens in der Pressenpartie die für eine bestimmte PPS-Rauhigkeit nach Durchführung der Satinage die erforderlichen Satinage-Linienkräfte um bis zu 100 kN/m niedriger sein können. Dies hat eine erheblich verbesserte Qualität des Endprodukts zur Folge, da negative Effekte der Satinage, wie z. B. Schwarzsatinage oder Volumenabnahme, deutlich reduziert werden.In the two last press nips a macro-smoothing of the surface of the paper web takes place at a high press pulse, which leads to an improved calenderability in the following multinip calender. It can be seen that due to wet-smoothness in the press section, for a given PPS roughness after calendering, the required calendering line forces may be lower by up to 100 kN / m. This results in a significantly improved quality of the final product, since negative effects of the calendering, such. As black satin or volume decrease, be significantly reduced.
Um noch höhere Produktionsgeschwindigkeiten nach diesem Konzept erzielen zu können, müssen maximale Trockengehalte nach dem Durchlaufen der Pressenpartie erzielt und die erforderlichen Bahnzüge minimiert werden, um ein Überdehnen und damit Abrisse in der Trockenpartie zu vermeiden. Der Betrieb eines Schuhnips im dritten Pressnip kann den Trockengehalt gegenüber konventionellen Walzennips um bis zu vier Prozent erhöhen. Jedoch geht dieser positive Effekt zu Lasten der Oberflächenqualität und somit der Bedruckbarkeit, insbesondere der filzberührten Oberfläche der Papierbahn. Ebenso kann der erste Pressnip als Schuhnip ausgebildet sein, um den Trockengehalt weiter zu erhöhen.In order to be able to achieve even higher production speeds according to this concept, maximum dry contents must be achieved after passing through the press section, and the required web courses must be minimized in order to avoid overstretching and thus cracks in the dryer section. The operation of a shoe tip in the third press nip can increase the dry content compared to conventional roll nips by up to four percent. However, this positive effect is at the expense of the surface quality and thus the printability, in particular the felt-contacting surface of the paper web. Likewise, the first press nip may be formed as a Schuhnip to further increase the dry content.
Zur Erzeugung hochwertiger ungestrichener Magazinpapiere (SC-Papiere) ist der Einsatz eines vierten Pressnips essentiell, wobei die Papierbahn zur Glättung zusammen mit einem Unterfilz durch den Pressnip geführt wird. Dieser Nip kann auch als Schuhnip mit verlängerter Verweilzeit ausgeführt werden, um den Glätteffekt zu verstärken.To produce high-quality uncoated magazine papers (SC papers), the use of a fourth press nip is essential, with the paper web being led through the press nip together with an underfelt for smoothing. This nip can also be used as a Schuhnip with extended residence time to enhance the smoothness effect.
Anstelle des nach dem Stand der Technik im dritten Pressnip eingesetzten Filzes wird nun ein impermeables, glattes Transferband eingesetzt, wodurch vermieden wird, dass die Papierbahn im freien Zug von der Zentralwalze weitergeführt werden muss. Die Papierbahn wird vielmehr kurz vor dem Erreichen des vierten Pressnips, der in einer freistehenden Presse angeordnet ist, mit Hilfe einer besaugten Transferwalze abgenommen und auf eine weitere Saugwalze mit dem Unterfilz oder einem permeablen, besaugbaren Transferband übergeben.Instead of the felt used according to the prior art in the third press nip an impermeable, smooth transfer belt is now used, thereby avoiding that the paper web continued in the free train of the central roll must become. Rather, the paper web is removed shortly before reaching the fourth press nip, which is arranged in a free-standing press, with the aid of a vacuumed transfer roller and transferred to another suction roll with the underfelt or a permeable, absorbable transfer belt.
Die Transfersaugwalze weist in vorteilhafter Weise eine gummierte Manteloberfläche auf. Sie kann ebenso ein Bohrmuster in ihrem Walzenmantel aufweisen.The transfer suction roll advantageously has a rubberized mantle surface. It may also have a drilling pattern in its roll shell.
Zur sicheren Abnahme der Papierbahn kann die Walze variabel in ihrer Eintauchtiefe gegenüber der Papierbahn und dem Transferband verstellt werden. Hierzu ist eine Verstellvorrichtung vorhanden, mittels deren die Walze verfahrbar ist.For safe removal of the paper web, the roller can be variably adjusted in its immersion depth with respect to the paper web and the transfer belt. For this purpose, an adjusting device is provided, by means of which the roller is movable.
Um den positiven Glätteffekt der Pressenpartie zu verstärken, können in allen Positionen auch neuartige Pressfilze eingesetzt werden. Eine extrem feine Oberfläche der Pressfilze kommt aufgrund des Einsatzes eines bestimmten Schmelzfaseranteils zustande. Durch diese Maßnahme werden die negativ in Erscheinung tretenden Filzmarkierungen drastisch reduziert.In order to increase the positive smoothness effect of the press section, novel press felts can be used in all positions. An extremely fine surface of the press felts is due to the use of a certain amount of molten fiber material. By this measure, the negative appearing felt marks are drastically reduced.
Die Vorteile der Erfindung bestehen darin, dass höchste Produktionsgeschwindigkeiten aufgrund des Erreichens maximaler Trockengehalte nach dem Durchlaufen der Siebpartie und der Pressenpartie und infolge der Minimierung der freien Züge in der Pressenpartie durch den Einsatz des Transferbandes möglich sind. Aufgrund des Nassglätteffekts in der Pressenpartie auf beiden Seiten der Papierbahn wird auch eine schonende Satinage ermöglicht. Mittels der erfindungsgemäß gebauten Pressenpartie werden beste Bedruckbarkeitseigenschaften, vor allem für den Tiefdruck, aufgrund verbesserter Topographie-Eigenschaften des Rohpapiers erzielt.The advantages of the invention are that highest production speeds due to the achievement of maximum dry contents after passing through the wire section and the press section and as a result of minimizing the free draws in the press section by the use of the transfer belt are possible. Due to the wet smoothness effect in the press section on both sides of the paper web also a gentle calendering is possible. By means of the press section constructed according to the invention, best printability properties, especially for gravure printing, are achieved on account of improved topography properties of the base paper.
Das Transferband weist bevorzugt eine glatte Oberfläche auf und ist insbesondere wasserundurchlässig. Das Transferband kann aber auch zumindest leicht luftdurchlässig ausgebildet sein. Durch die dadurch bewirkte Hinterlüftung ist das Bahnabnahmeverhalten verbessert.The transfer belt preferably has a smooth surface and is in particular water-impermeable. The transfer belt can also be at least light permeable to air. The ventilation caused thereby improves the web picking behavior.
Vorteilhaft ist des Weiteren die Verwendung einer Reinigungsvorrichtung für das Transferband.Furthermore, the use of a cleaning device for the transfer belt is advantageous.
Nach einer besonderen Ausgestaltung der Erfindung ist der vierte Pressnip an einer separaten Presse ausgebildet. Dabei ist die obere Walze der vierten Presse insbesondere mit glatter Oberfläche ausgebildet. Die aus der die drei ersten Pressnips bildenden Kompaktpresse kommende Faserstoffbahn hat eine Rauhigkeitszweiseitigkeit, da die Oberseite rauer ist als ihre Unterseite. Durch die Verwendung einer glatten oberen Walze in der vierten Presse kann diese Zweiseitigkeit ausgeglichen werden.According to a particular embodiment of the invention, the fourth press nip is formed on a separate press. In this case, the upper roller of the fourth press is formed in particular with a smooth surface. The fibrous web coming from the compact press forming the first three press nips has a roughness two-sidedness, since the upper side is rougher than its lower side. By using a smooth top roller in the fourth press this two-sidedness can be compensated.
Die Abnahme der Faserstoffbahn von der glatten Walze in der vierten Presse kann durch ein Saugelement, insbesondere eine Saugwalze erfolgen. Die Saugwalze weist dabei bevorzugt einen porösen Bezug, weiter bevorzugt einen weichen, filzartigen Bezug auf. Durch diese Maßnahmen ist eine gute Bahnabnahme möglich.The decrease of the fibrous web from the smooth roll in the fourth press can be effected by a suction element, in particular a suction roll. The suction roll preferably has a porous cover, more preferably a soft, felt-like cover. By these measures, a good Bahnabnahme is possible.
Eine gute Bahnabnahme vom Saugelement ergibt sich nach einer weiteren Ausgestaltung der Erfindung durch eine weitere Saugwalze. Diese ist bevorzugt vom Trockensieb einer nachfolgenden Trockenpartie umschlungen, so dass die Faserstoffbahn direkt durch das Trockensieb in die Trockenpartie überführt wird.A good web removal from the suction element results according to a further embodiment of the invention by a further suction roll. This is preferably wrapped by the dryer fabric of a subsequent dryer section, so that the fibrous web is transferred directly through the dryer fabric in the dryer section.
Das Transferelement zur Überführung der Faserstoffbahn von dem Transferband zum vierten Pressnip weist bevorzugt einen weichen, insbesondere luftdurchlässigen Bezug auf. Beispielsweise kann der Bezug aus Kunststoff oder einem Filz bestehen. Hiermit kann ein guter Transfer erreicht werden.The transfer element for transferring the fibrous web from the transfer belt to the fourth press nip preferably has a soft, in particular air-permeable, reference. For example, the cover may be made of plastic or a felt. Hereby a good transfer can be achieved.
Ebenfalls bevorzugt und vorteilhaft ist es, wenn das Transferelement angetrieben ist. Dadurch kann eine sichere Überführung der Faserstoffbahn gewährleistet werden.Also preferred and advantageous is when the transfer element is driven. This ensures a safe transfer of the fibrous web become.
Als Transferelement kann neben einer Transfersaugwalze auch eine insbesondere luftdurchlässige Bandschlaufe vorgesehen sein. Beispielsweise kann ein Filzband mit feinem Flor verwendet werden. Im Bereich der Bahn kann die Bahnschlaufe im bahnführenden Bereich insbesondere besaugt werden, d.h. auf der der Faserstoffbahn abgewandten Seite mit Unterdruck beaufschlagt werden, beispielsweise durch Foils, Saugkästen oder andere bekannte Saugvorrichtungen. Auch hiermit kann eine gute Führung und / oder Übergabe der Faserstoffbahn gewährleistet werden.As a transfer element can be provided in addition to a transfer suction and a particular air-permeable belt loop. For example, a felt belt with a fine pile can be used. In the area of the web, the web loop in the web-guiding area can be in particular vacuumed, i. On the side facing away from the fibrous web are subjected to negative pressure, for example by foils, suction boxes or other known suction devices. Hereby, good guidance and / or transfer of the fibrous web can be ensured.
Die Bandschlaufe kann des Weiteren auch mehrere Leitwalzen umschlingen. Dabei ist bevorzugt mindestens eine Walze der Bandschlaufe angetrieben. Es ergibt sich hierdurch eine größere Bandschlaufe zur Übertragung der Faserstoffbahn mit entsprechenden Vorteilen.The belt loop can also wrap around several guide rollers. In this case, preferably at least one roller of the belt loop is driven. This results in a larger belt loop for the transmission of the fibrous web with corresponding advantages.
Die obere Walze des vierten Pressnips ist nach einer weiteren Ausgestaltung der Erfindung mit einem Glättband umschlungen. Dadurch kann die glättende Oberfläche durch Bandwechsel einfach verändert werden. Beispielsweise kann dies notwendig werden, um das Bahnabgabeverhalten von glatten Oberflächen zu optimieren. Das Glättband hat dabei insbesondere eine glatte Oberfläche. Außerdem kann das Glättband dicht oder luftdurchlässig sein.The upper roller of the fourth press nip is wrapped in a further embodiment of the invention with a smoothing belt. As a result, the smoothing surface can be easily changed by changing the band. For example, this may be necessary to optimize the web delivery performance of smooth surfaces. The smoothing strip in particular has a smooth surface. In addition, the smoothing tape may be dense or permeable to air.
Das Glättband kann grundsätzlich wie das Transferband ausgeführt sein. Insbesondere können alle drei Bänder, Glättband, Transferband und Band der Bandschlaufe, gleich ausgeführt sein. Damit ergibt sich eine einheitliche Behandlung der Faserstoffbahn.The smoothing belt can basically be designed like the transfer belt. In particular, all three bands, smoothing belt, transfer belt and belt of the belt loop, can be made equal. This results in a uniform treatment of the fibrous web.
Nach einer weiteren Ausführung der Erfindung ist die Anordnung so getroffen, dass die Übertragung der Faserstoffbahn durch das Transferelement direkt im Bereich des freien Filzzuges der vierten Presse erfolgt. Dabei kann im Übertragungsbereich in der Filzschlaufe ein Saugelement zur besseren Bahnabgabe bzw. Bahnaufnahme vorgesehen sein. Durch die direkte Bahnübergabe kann Platz eingespart werden. Darüber hinaus ist die Herstellung vereinfacht.According to a further embodiment of the invention, the arrangement is such that the transfer of the fibrous web through the transfer element takes place directly in the region of the free felt train of the fourth press. In this case, in the transfer area in the felt loop, a suction element for better Bahnabgabe or railway recording be provided. Space can be saved thanks to the direct rail transfer. In addition, the production is simplified.
Das Transferelement kann außerdem mindestens zwei Vakuumzonen aufweisen, nämlich insbesondere eine Pickupzone und eine Haltezone. Das Vakuum in der Pickupzone ist dabei bevorzugt höher als das in der Haltezone. Damit kann eine besonders gute und dennoch schonende Bahnübergabe erreicht werden.The transfer element can also have at least two vacuum zones, specifically a pickup zone and a holding zone. The vacuum in the pickup zone is preferably higher than that in the holding zone. This allows a particularly good and yet gentle web transfer can be achieved.
Ausführungsbeispiele sind in den Zeichnungen dargestellt und werden nachfolgend beschrieben. Es zeigen, jeweils in schematischer Darstellung,
- Fig. 1
- eine erste Variante einer erfindungsgemäßen Vorrichtung,
- Fig. 2
- eine Variante zur
Fig. 1 , - Fig. 3
- eine weitere Variante zur
Fig. 1 , und - Fig. 4
- noch eine Variante zur
Fig. 1 .
- Fig. 1
- a first variant of a device according to the invention,
- Fig. 2
- a variant to
Fig. 1 . - Fig. 3
- another variant to
Fig. 1 , and - Fig. 4
- another variant to
Fig. 1 ,
Eine Faserstoffbahn 1 wird, aus einer Siebpartie kommend, durch eine Pressenpartie geführt. In dieser wird sie, gestützt durch einen Unterfilz 2 und einen Oberfilz 3, durch einen ersten Pressnip 4 geführt, der durch eine Presssaugwalze 5 mit einer Schuhpresswalze 6 mit Schuhpresszone 7 gebildet wird. Nach dem Pressnip 4 wird der Unterfilz 2 wieder von der Faserstoffbahn 1 getrennt, so dass diese, auf dem Oberfilz 3 aufliegend, zwischen der Presssaugwalze 5 und einer Zentralwalze 8 durch einen zweiten Pressnip 9 hindurchgeführt wird.A fibrous web 1, coming from a wire section, passed through a press section. In this she is guided, supported by a
Optional kann der zweite Pressnip 9 derart betrieben werden, dass die erzeugte Linienkraft maximal 50kN/m, vorzugsweise maximal 30kN/m, beträgt. Durch diese sehr geringe Linienkraft, auch "Kissing Contact" genannt, wird ein schonende Behandlung der Faserstoffbahn im zweiten Pressnip 9 der Pressenpartie gewährleistet, wobei der "Kissing Kontakt" im wesentlichen dazu da ist, die Faserstoffbahn 1 von der Presssaugwalze 5 auf die Zentralwalze 8 zu übertragen. Anzumerken ist, dass der "Kissing Contact" Betrieb selbstverständlich auch bei allen in den nachfolgenden Figuren beschriebenen Ausführungsbeispielen angewendet werden kann.Optionally, the second press nip 9 can be operated such that the line force generated is a maximum of 50 kN / m, preferably a maximum of 30 kN / m. This very low line force, also called "kissing contact", becomes a gentle one Treatment of the fibrous web in the second press nip 9 ensures the press section, wherein the "kissing contact" is essentially there to transfer the fibrous web 1 from the
Um eine gute Glättung auf der der Zentralwalze 8 zugewandten Seite zu gewährleisten, wird ein Transferband 10 zusammen mit der Faserstoffbahn 1 durch den Pressnip 9 hindurchgeführt. Anschließend wird der Oberfilz 3 von der Presssaugwalze 5 weggeführt.In order to ensure a good smoothing on the
Die Faserstoffbahn 1 wird nun zusammen mit dem Transferband 10 und einem weiteren Oberfilz 11 durch einen Pressnip 12 hindurchgeführt, der von der Zentralwalze 8 und einer mit einer Schuhpresszone 13 ausgestatteten Schuhpresswalze 14 gebildet wird.The fibrous web 1 is then passed together with the
Sodann wird die Faserstoffbahn 1 durch eine Transfersaugwalze 15 von dem Transferband 10 abgesaugt und mittels einer weiteren Transfersaugwalze 16 auf einen Unterfilz 17 überführt. Danach wird die Faserstoffbahn 1 zusammen mit dem Unterfilz 17 durch die zu einer freistehenden Presseneinheit gehörigen Presswalzen 18, 19 hindurchgeführt, die miteinander einen vierten Pressspalt 20 bilden.Then, the fibrous web 1 is sucked off by a transfer suction roll 15 from the
Die obere Walze 19 des vierten Pressnips 20 weist eine glatte Oberfläche auf. Von dieser Walze 19 wird die Faserstoffbahn 1 mittels einer Saugwalze 21 mit porösem, vorzugsweise weichem Bezug abgenommen. Von der Walze 21 wiederum wird die Faserstoffbahn durch eine Saugwalze 22 abgenommen. Die Saugwalze 22 ist dabei von einem Trockensieb 23 der nachfolgenden Trockenpartie umschlungen, von der zwei Trockenzylinder 24 und 25 sowie ein Duostabilisator 26 dargestellt sind. Anstelle des Duostabilisators kann auch ein HiDryer verwendet werden.The
Das Ausführungsbeispiel von
Die Variante von
Es ist noch anzumerken, dass die in den
Die Variante von
Bei allen dargestellten Varianten ist das Transferband 10 außerdem mit einer Reinigungsvorrichtung versehen. Diese besteht aus einem Spritzrohr 35, einer Schmutzabnahmewalze 36 und einer Auffang- und Sammelvorrichtung 37.In all variants shown, the
Claims (35)
- Machine for manufacturing a paper or another fibrous web (1), comprising a press section with felted nips and in which the fibrous web (1) can be led through a first press nip and over a central roll (8) that forms two press nips (9, 12) with a first (5) and a second press roll (14), it being possible for the fibrous web (1), together with a transfer belt (10), to be led through the press nips (9, 12) formed between the central roll (8) and the press rolls (5, 14), characterized in that the fibrous web (1) can be transferred from the transfer belt (10) to a further felt (17) by a transfer element (15) and can be led through a fourth press nip (20).
- Machine according to Claim 1, characterized in that the line force generated in the first press nip (9) formed by the first press roll (5) and the central roll (8) is at most 50 kN/m, preferably at most 30 kN/m.
- Machine according to Claim 1 or 2, characterized in that the fibrous web (1) can be transferred from the transfer belt (10) to a bottom felt (17) by a transfer suction roll (15) and can be led through the fourth press nip (20).
- Machine according to Claim 3, characterized in that the transfer suction roll (15) has a rubber-covered circumferential surface and/or a drilled hole pattern in the circumferential surface.
- Machine according to Claim 3 or 4, characterized in that the transfer suction roll (15) can be adjusted in terms of its penetration depth with respect to the transfer belt (10) and the fibrous web (1).
- Machine according to one of Claims 1 to 5, characterized in that the second press roll (14) is formed as a shoe press roll and comprises a shoe press zone (13).
- Machine according to one of the preceding claims, characterized in that the first press roll (6) is formed as a shoe press roll and has a shoe press zone (7).
- Machine according to one of the preceding claims, characterized in that the transfer belt (10) has a smooth surface.
- Machine according to one of the preceding claims, characterized in that the transfer belt (10) is impermeable to water.
- Machine according to one of the preceding claims, characterized in that the transfer belt (10) is at least slightly permeable to air.
- Machine according to one of the preceding claims, characterized in that a cleaning apparatus (35, 36, 37) for the transfer belt (10) is provided.
- Machine according to one of the preceding claims, characterized in that the fourth press nip (20) is formed in a separate press (18, 19).
- Machine according to one of the preceding claims, characterized in that the surface of the top roll (19) of the fourth press nip (20) is smooth.
- Machine according to one of the preceding claims, characterized in that the fibrous web is removed from the top roll (19) of the fourth press nip (20) by a suction element, in particular a suction roll (21).
- Machine according to Claim 14, characterized in that the suction roll (21) has a porous cover.
- Machine according to either of Claims 14 and 15, characterized in that the suction roll (21) has a soft, felt-like cover.
- Machine according to one of Claims 14 to 16, characterized in that the removal from the suction element (21) is carried out by a suction roll (22).
- Machine according to Claim 17, characterized in that the dryer fabric (23) of a following drying section (24, 25, 26) is wrapped around the suction roll (22).
- Machine according to one of the preceding claims, characterized in that the transfer element (15) is provided with a soft, air-permeable cover.
- Machine according to one of the preceding claims, characterized in that the transfer element (15) is driven.
- Machine according to one of the preceding claims, characterized in that the transfer element provided is a belt loop (27), which is in particular permeable to air.
- Machine according to the preceding Claim 21, characterized in that the belt loop (27) is formed as a felt, in particular with a fine pile.
- Machine according to Claim 21 or 22, characterized in that the belt loop (27) is evacuated in the web-guiding region.
- Machine according to one of Claims 21 to 23, characterized in that the belt loop (27) wraps around a plurality of guide rolls.
- Machine according to one of the preceding claims, characterized in that a smoothing belt (31) is wrapped around the top roll (19) of the fourth press nip (20).
- Machine according to Claim 25, characterized in that the smoothing belt (31) has a smooth surface.
- Machine according to either of Claims 25 and 26, characterized in that the smoothing belt (31) is impermeable to air.
- Machine according to either of Claims 25 and 26, characterized in that the smoothing belt (31) is permeable to air.
- Machine according to one of Claims 25 to 28, characterized in that the transfer belt (10) and the smoothing belt (31) are of the same construction.
- Machine according to one of Claims 25 to 28, characterized in that all three belts, transfer belt (10), smoothing belt (31) and belt loop (27), are of the same construction.
- Machine according to one of the preceding claims, characterized in that the fibrous web (1) is transferred to the felt (17) of the fourth press (18, 19) by the transfer element (15) directly in the region of the free felt draw of this felt (17).
- Machine according to Claim 31, characterized in that a suction element (32) is arranged in the transfer region.
- Machine according to one of the preceding claims, characterized in that the transfer element (15) has two or more suction zones (33, 34).
- Machine according to Claim 33, characterized in that the transfer element (15) has a pickup zone (33) and a holding zone (34).
- Machine according to Claim 34, characterized in that the vacuum of the pickup zone (33) is higher than the vacuum of the holding zone (34).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005031203A DE102005031203A1 (en) | 2005-07-01 | 2005-07-01 | paper machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1739228A1 EP1739228A1 (en) | 2007-01-03 |
EP1739228B1 true EP1739228B1 (en) | 2008-02-13 |
Family
ID=37036926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06115709A Not-in-force EP1739228B1 (en) | 2005-07-01 | 2006-06-20 | Machine for manufacturing a fibrous web |
Country Status (3)
Country | Link |
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EP (1) | EP1739228B1 (en) |
AT (1) | ATE386154T1 (en) |
DE (2) | DE102005031203A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT504090B1 (en) * | 2006-09-13 | 2008-09-15 | Andberg Janne Johannes | INTERMEDIATE TILTING ARRANGEMENT OF A DRAINAGE DEVICE WITH A TISSUE-CONVERSED OVERRIDE OVER ROLLER |
FI121146B (en) | 2008-06-19 | 2010-07-30 | Metso Paper Inc | Web forming machine and method in a web forming machine |
DE102018119381A1 (en) * | 2018-08-09 | 2020-02-13 | Voith Patent Gmbh | Press arrangement |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI88812C (en) * | 1992-03-05 | 1993-07-12 | Valmet Paper Machinery Inc | Device for controlling the web's tip drawing tape in a paper machine |
US5766422A (en) * | 1996-08-01 | 1998-06-16 | Beloit Technologies, Inc. | Lightweight high temperature pressing |
DE19702575A1 (en) * | 1997-01-24 | 1998-07-30 | Voith Sulzer Papiermasch Gmbh | Machine for the production of a fibrous web |
DE19744341A1 (en) * | 1997-10-07 | 1999-04-15 | Voith Sulzer Papiertech Patent | Paper machine |
FI112873B (en) * | 1999-03-12 | 2004-01-30 | Metso Paper Inc | Method and apparatus for treating a paper or cardboard web |
WO2003071028A1 (en) * | 2002-02-22 | 2003-08-28 | Voith Paper Patent Gmbh | Smoothing device |
-
2005
- 2005-07-01 DE DE102005031203A patent/DE102005031203A1/en not_active Withdrawn
-
2006
- 2006-06-20 EP EP06115709A patent/EP1739228B1/en not_active Not-in-force
- 2006-06-20 DE DE502006000339T patent/DE502006000339D1/en active Active
- 2006-06-20 AT AT06115709T patent/ATE386154T1/en active
Also Published As
Publication number | Publication date |
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ATE386154T1 (en) | 2008-03-15 |
EP1739228A1 (en) | 2007-01-03 |
DE502006000339D1 (en) | 2008-03-27 |
DE102005031203A1 (en) | 2007-01-25 |
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