EP0775777B1 - Calender in a paper- or coating machine - Google Patents

Calender in a paper- or coating machine Download PDF

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Publication number
EP0775777B1
EP0775777B1 EP96117572A EP96117572A EP0775777B1 EP 0775777 B1 EP0775777 B1 EP 0775777B1 EP 96117572 A EP96117572 A EP 96117572A EP 96117572 A EP96117572 A EP 96117572A EP 0775777 B1 EP0775777 B1 EP 0775777B1
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Prior art keywords
calender
paper
rolls
roller
rollers
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EP96117572A
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German (de)
French (fr)
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EP0775777A2 (en
EP0775777A3 (en
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Hans-Rolf Conrad
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Voith Paper GmbH and Co KG
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Voith Paper Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • the invention relates to a paper or Coating machine with inside this machine arranged calender according to the preamble of Claim 1.
  • DE 295 04 034 U1 shows an arrangement for treatment a paper web with a calender inside the Paper or coating machine, i.e. in-line, arranged and is the features of the preamble of the claim 1 has.
  • US 4,332,191 A shows a calender with two or three Roll stacks, each of three rolls and two Has nips.
  • the roll stacks can be from one Be traversed one after the other. Every roller has its own drive.
  • a rope guide is provided in the calender has two ropes that the paper web between them clamp, and along the path of the paper web through the Calender runs.
  • US 4,022,366 A shows a device for transport a paper web from the drying zone one Paper machine to a calender in which the Paper web placed on an air-permeable tape is almost at paper machine speed running. The tape rests on a suction box that is placed under negative pressure. Before the first nip of the A calender is provided with a calender which the paper web is blown off the belt.
  • super calenders For higher quality papers, such as gravure papers, so-called super calenders become satinizing used. These are outside the paper machine and consist of a larger stack on top of each other arranged rollers.
  • This type of calender, too hard, heated rollers and elastic covered Has rolls, a roll unwind is connected upstream, one wound up after the paper machine unsatized paper web through the 8 to 13 nips of the supercalender until it is rewound to be led.
  • this type of calender at least 40% of the rollers have an elastic cover or Covering. Because the super calender is much more Nips as a soft calender can be on the paper web applied a larger deformation work be, for example, for high gloss and Smoothness of the paper web ensures.
  • the object of the invention is to produce a calender high quality paper for operation within to make a paper or coating machine more suitable.
  • the heated rollers must be designed so that good heat transfer from a heating medium to the Paper web can be done. Because even heating the paper web is essential for the calendering process. The best and most even across the roller width Heat transfer by convection from a heat transfer medium to the inner wall of the roller offers water vapor, which also in every paper mill to a sufficient extent Available.
  • the heating rollers can also be used with peripheral Be provided holes through which the steam is directed. To ensure sufficient satin results to achieve high quality paper, it is advantageous if at least two heated rollers in the calender are installed.
  • the nature of the elastic roller coverings is important for the calender according to the invention.
  • They have to be wear-resistant like that Coverings from soft calenders to ensure a sufficient service life to own, because otherwise you change the roller would have to interrupt the whole paper making process.
  • the covering has to be like this to be in a position to employ a Scraper blade not cleaned to clean the rollers becomes. Suitable for realizing these three requirements just a plastic covering.
  • an additional retraction device is required of an insertion strip, as similar to the super calender the paper web after a nip around a deflecting roller is guided into the next nip, and this - unlike the supercalender - with paper machine speed specifications.
  • a device for pulling in an insertion strip for example two parallel to the desired paper path Be ropes, between the one of the paper web cut insertion strip is pinched. This is done by placing the two ropes in front of the calender be brought together, form a so-called rope scissors, together via pulleys according to the desired Paper run through the calender and out after the calender open again to the insertion strip to release again.
  • the insertion strip which is a width can have from 300 to 500 mm before the calender to the side of the web coming out of the paper machine cut. Then through this insertion strip the calender up to a rewinder, for example most of the paper web is led in directed a pulper. Only after completion of the pull-in process of the lead strip becomes the lead strip by moving the knife ever wider cut until finally the full width of the paper web is led through the calender.
  • retractors are used that work according to the following principle.
  • the Lead strip is perforated on an endless Carrying tape, which is approximately with paper or Coating machine speed runs around two rolls, at least one of which is driven.
  • a suction box below the conveyor belt causes the paper web adheres to the carrier tape and with the running tape is carried.
  • Additional insertion aids can also be air jets or air baffles of known design.
  • the calender (1) has eight rollers (2 to 9), from which four rollers (2, 4, 7, 9) a hard metallic Surface and four rollers (3, 5, 6, 8) an elastic Have plastic covering (13). All rollers are stored with their roller journals in bearing housings (23, 23 '). The bearing housings (23 ') of the middle rollers (3, 4, 5, 6, 7, 8) are attached to levers (24), the The fulcrum (25) is located on the calender frame (26). A hydraulic cylinder (27) is provided, on the one hand the forces required for satinizing in the closed Nip and on the other hand the Lower roller (9) can lower. By lowering the Lower roller (9) lay the levers (24) on stops (28) in such a way that between the Roll to form gaps of 5 to 10 mm.
  • the drawing shows the condition of the calender after another Closing the rollers, what by extending the Hydraulic cylinder (27) happens.
  • the two middle hard rollers (4, 7) heating steam for heating in a manner not shown are fed.
  • the heating steam is through peripheral Drilled holes (22) so that it gets its heat can deliver to the roller.
  • An example is an elastic roller (3) a commercially available scraper (14) is installed.
  • Suction box (20) of the carrying band (18) Under the part carrying the insertion strip (21) there is a suction box (20) of the carrying band (18), generates a vacuum in a manner not shown becomes. In the direction of the carrier tape (18) Suction box (20) open so that the insertion strip (21) sucked through the perforation of the carrier tape (18) is and adheres to the strap.

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Description

Die Erfindung betrifft eine Papier- oder Streichmaschine mit innerhalb dieser Maschine angeordnetem Kalander nach dem Oberbegriff des Anspruchs 1.The invention relates to a paper or Coating machine with inside this machine arranged calender according to the preamble of Claim 1.

DE 295 04 034 U1 zeigt eine Anordnung zur Behandlung einer Papierbahn mit einem Kalander, der innerhalb der Papier- oder Streichmaschine, also In-Line, angeordnet ist und die die Merkmale des Oberbegriffs des Anspruchs 1 aufweist.DE 295 04 034 U1 shows an arrangement for treatment a paper web with a calender inside the Paper or coating machine, i.e. in-line, arranged and is the features of the preamble of the claim 1 has.

US 4 332 191 A zeigt einen Kalander mit zwei oder drei Walzenstapeln, von denen jeder drei Walzen und zwei Nips aufweist. Die Walzenstapel können von einer Papierbahn nacheinander durchfahren werden. Jede Walze hat einen eigenen Antrieb. Zum Einführen der Papierbahn in den Kalander ist eine Seilführung vorgesehen, die zwei Seile aufweist, die die Papierbahn zwischen sich klemmen, und entlang des Weges der Papierbahn durch den Kalander mitläuft.US 4,332,191 A shows a calender with two or three Roll stacks, each of three rolls and two Has nips. The roll stacks can be from one Be traversed one after the other. Every roller has its own drive. For inserting the paper web A rope guide is provided in the calender has two ropes that the paper web between them clamp, and along the path of the paper web through the Calender runs.

N. Gamsjäger, Elastische Kalanderwalzenbezüge auf Basis Faser-Kunststoff-Verbund, Das Papier 48, 1994, Nr. 6, Seiten 334-348, beschreibt Walzenbezüge, bei denen der Einsatz von Reinigungssystemen, wie Schabern, bei kritischen Papierqualitäten erforderlich ist, um Zerstörungen der Bezüge zu vermeiden. N. Gamsjäger, elastic calender roll covers based Fiber-plastic composite, Das Papier 48, 1994, No. 6, Pages 334-348, describes roll covers in which the Use of cleaning systems, such as scrapers, at critical paper grades is required to Avoid destroying the covers.

US 4 022 366 A zeigt eine Vorrichtung zum Transport einer Papierbahn von der Trockenzone einer Papiermaschine zu einem Kalander, bei der die Papierbahn auf ein luftdurchlässiges Band aufgelegt wird, das annähernd mit Papiermaschinengeschwindigkeit läuft. Das Band liegt auf einem Saugkasten auf, der unter Unterdruck gesetzt wird. Vor dem ersten Nip des Kalanders ist eine Abhebeeinrichtung vorgesehen, mit der die Papierbahn vom Band abgeblasen wird.US 4,022,366 A shows a device for transport a paper web from the drying zone one Paper machine to a calender in which the Paper web placed on an air-permeable tape is almost at paper machine speed running. The tape rests on a suction box that is placed under negative pressure. Before the first nip of the A calender is provided with a calender which the paper web is blown off the belt.

DE 93 06 176 U1 zeigt eine beheizbare Walze, die peripher gebohrte Kanäle aufweist, durch die Dampf geleitet werden kann.DE 93 06 176 U1 shows a heatable roller that has peripherally drilled channels through which steam can be directed.

Aus zahlreichen Veröffentlichungen sind jedem Fachmann für die Papierherstellung Soft-Kalander bekannt. Die Kalander, die aus einer harten, beheizten Hartguß- oder Stahlwalze und einer oder zwei elastischen Walzen, die mit der harten Walze einen oder zwei Walzenspalte bilden, bestehen, können innerhalb der Papier- oder Streichmaschine stehen. Diese Kalander sind allerdings nur bei einfach zu satinierenden Papieren, wie beispielsweise Zeitungsdruckpapier einsetzbar. Das in der Papiermaschine erzeugte Papier wird demnach vor der ersten Aufwicklung satiniert.Every expert is from numerous publications known for paper making soft calenders. The Calenders made from a hard, heated chilled iron or Steel roller and one or two elastic rollers that form one or two nips with the hard roller, can exist within the paper or Coating machine stand. However, these calenders are only for papers that are easy to satin, such as Newsprint can be used. That in the Paper machine generated paper is accordingly before the first winding satin.

Für höherwertige Papiere, wie beispielsweise Tiefdruckpapiere, werden sogenannte Superkalander zur Satinage verwendet. Diese stehen außerhalb der Papiermaschine und bestehen aus einem größeren Stapel übereinander angeordneter Walzen. Diese Art von Kalander, der ebenfalls harte, beheizte Walzen und elastisch bezogene Walzen besitzt, ist eine Rollenabwicklung vorgeschaltet, von der eine nach der Papiermaschine aufgewickelte unsatisierte Papierbahn durch die 8 bis 13 Walzenspalte des Superkalanders bis zu einer erneuten Aufwicklung geführt wird. Bei dieser Art von Kalander besitzen wenigstens 40% der Walzen einen elastischen Bezug oder Belag. Dadurch, daß der Superkalander sehr viel mehr Walzenspalte als ein Soft-Kalander besitzt, kann auf die Papierbahn eine größere Verformungsarbeit aufgebracht werden, die beispielsweise für hohe Glanz- und Glättewerte der Papierbahn sorgt.For higher quality papers, such as gravure papers, so-called super calenders become satinizing used. These are outside the paper machine and consist of a larger stack on top of each other arranged rollers. This type of calender, too hard, heated rollers and elastic covered Has rolls, a roll unwind is connected upstream, one wound up after the paper machine unsatized paper web through the 8 to 13 nips of the supercalender until it is rewound to be led. With this type of calender at least 40% of the rollers have an elastic cover or Covering. Because the super calender is much more Nips as a soft calender can be on the paper web applied a larger deformation work be, for example, for high gloss and Smoothness of the paper web ensures.

Es ist mehrfach darüber nachgedacht worden, die seit mehr als hundert Jahren existierenden Superkalander innerhalb der Papiermaschine anzuordnen. Diese Idee ist aber aus den folgenden Hauptgründen immer wieder gescheitert:

  • 1. In Superkalandern wird die Papierbahn nach dem Durchlauf durch einen Walzenspalt über eine Umlenkrolle zum nächstfolgenden Walzenspalt zurückgeführt. Diese Umlenkung der Papierbahn um nahezu 180° konnte bei den gegebenen Umlenkradien (Radius der Umlenkwalze) von etwa 150 bis 200 mm und den hohen Aufführgeschwindigkeiten (ca. 1000 bis 1200 m/min) der aus der Papiermaschine kommenden Papierbahn wegen der hohen Zentrifugalkräfte an den Umlenkwalzen bislang nicht realisiert werden.
  • 2. Ein Schließen der einzelnen Walzenspalte war ohne Abriß der Papierbahn bei den hohen Geschwindigkeiten nicht möglich. (Im Superkalander werden die Walzenspalte nach manuellem Aufführen der Papierbahn im Stillstand oder bei sehr langsamen Geschwindigkeiten geschlossen).
  • 3. Die niedrige Standzeit der elastischen Superkalanderwalzen von etwa einer Woche erlaubte keinen reibungslosen und durchgängigen Betrieb der Papiermaschine, denn in diesen Intervallen müßten die meist mit Fasermaterial bezogenen Walzen ausgebaut und die durch Faltungen im Papier verursachten Markierungen weggeschliffen werden.
  • 4. Superkalander in der Papiermaschine hätten keinen Zugang zum Reinigen der elastischen Walzen von Harzund Strichablagerungen mehr zugelassen, was aber für die Lebensdauer der Bezüge sehr entscheidend ist. Die mit Fasermaterial bezogenen Walzen erlaubten auch keine Entfernung von Ablagerungen mit einem Schaber, da dieser den Belag zerstörte.
  • 5. Insbesondere bei sehr hochwertigen Papieren (z.B. Kunstdruckpapier) konnte ein Superkalander wegen der hohen Geschwindigkeitsvorgabe durch die Papiermaschine nicht in ausreichendem und in über die Bahnbreite ausgeglichenem Maße der Papierbahn Wärme zuführen. Deshalb war es nötig, zwei oder eventuell sogar drei langsamer als die Papiermaschine laufende Superkalander der Papiermaschine nachzuschalten. Um in der Verweilzeit im Walzenspalt die für die gewünschten Glättewerte notwendige Wärme in die Papierbahn zu überführen, hätten bei In-Line-Geschwindigkeiten zu teure Ölheizungen mit großem Wärmeträgerdurchsatz für die Heizwalzen eingesetzt werden müssen.
    • It has been considered several times to arrange the supercalenders that have been in existence for more than a hundred years within the paper machine. This idea failed again and again for the following main reasons:
  • 1. In supercalenders, the paper web is passed back through a roller nip via a deflection roller to the next roller nip. This deflection of the paper web by almost 180 ° was possible with the given deflection radii (radius of the deflection roller) of approximately 150 to 200 mm and the high threading speeds (approx. 1000 to 1200 m / min) of the paper web coming from the paper machine because of the high centrifugal forces on the Deflection rollers have not yet been realized.
  • 2. It was not possible to close the individual nips without tearing off the paper web at the high speeds. (In the supercalender, the roll nips are closed after manual feeding of the paper web at a standstill or at very slow speeds).
  • 3. The short service life of the elastic supercalender rollers of about one week did not allow smooth and continuous operation of the paper machine, because at these intervals the rollers, which were mostly covered with fiber material, would have to be removed and the marks caused by folds in the paper had to be sanded away.
  • 4. Super calenders in the paper machine would no longer have access to cleaning the elastic rollers from resin and line deposits, which is very important for the life of the covers. The rollers covered with fiber material also did not allow the removal of deposits with a scraper, as this would destroy the coating.
  • 5. Particularly in the case of very high-quality papers (for example art paper), a supercalender could not supply heat to the paper web to an adequate extent and to a sufficient extent over the web width because of the high speed specification by the paper machine. It was therefore necessary to connect two or possibly even three supercalenders that were slower than the paper machine to the paper machine. In order to transfer the heat required for the desired smoothness values to the paper web during the dwell time in the nip, it would have been necessary to use expensive oil heaters with high heat transfer rates for the heating rollers at in-line speeds.

    • Wollte man wegen des Personalaufwandes dennoch die Satinage in die Papiermaschine integrieren, mußte man mehrere Soft-Kalander hintereinanderschalten, was zu erheblichem Platzbedarf führte.If you wanted satinizing because of the personnel costs one had to integrate into the paper machine several soft calenders in series, what to led to considerable space requirements.

    Aufgabe der Erfindung ist es, einen Kalander zur Erzeugung hoher Papierqualitäten für den Betrieb innerhalb einer Papier- oder Streichmaschine besser geeignet zu machen. The object of the invention is to produce a calender high quality paper for operation within to make a paper or coating machine more suitable.

    Gelöst wird die Aufgabe mit den kennzeichnenden Merkmalen des Anspruchs 1.The task is solved with the characteristic features of claim 1.

    Um höherwertige Papiere zu satinieren, reichen ein oder zwei Walzenspalte nicht aus. Es wurde erkannt, daß auch innerhalb der Papier- oder Streichmaschine wenigstens vier Walzenspalte für ein zufriedenstellendes Satinageergebnis notwendig sind. Das bedeutet, daß wenigstens fünf Walzen übereinander angeordnet eingesetzt werden müssen. Dabei sollten wenigstens die mittleren Walzenlager über Hebel mit dem Kalandergestell verbunden sein. Unter den mittleren Walzenlagern versteht man alle Kalanderwalzenlager mit Ausnahme derjenigen der Ober- bzw. Unterwalze. Das Einführen der Papierbahn erfolgt bei geöffneten Walzenspalten. Geöffnet werden diese durch eine vom Superkalander her bekannte Trenneinrichtung. Oft geschieht dies, indem die Unterwalze abgesenkt wird und die Hebel der mittleren Walzen gegen einen darunterliegenden Anschlag stoßen. Der Fallweg der Hebel ist jeweils so eingestellt, daß sich Walzenspalte von 5 bis 10 mm einstellen. Um diese Spalte nach dem Einführen der Papierbahn wieder zu schließen, wird üblicherweise ein Hydraulikzylinder eingesetzt, der die Unterwalze und in der weiteren Folge auch die anderen mittleren Walzen anhebt bis alle Spalte geschlossen sind. Erfindungsgemäß wird für jede Walze ein eigener Antrieb eingesetzt, der die Umfangsgeschwindigkeit der jeweiligen Walze auf Bahngeschwindigkeit bringt. Dadurch wird ein Abriß der Papierbahn beim Schließen der Walzenspalte ausgeschlossen.To satin high-quality papers, one or two nips not out. It was recognized that too at least within the paper or coating machine four nips for a satisfactory satin finish are necessary. That means at least five rollers arranged one above the other have to. At least the middle roller bearings should connected to the calender frame by lever his. The middle roller bearings are understood all calender roll bearings except those of the Top and bottom roller. The insertion of the paper web takes place with open nips. Be opened this through a separating device known from the supercalender. This is often done by the bottom roller is lowered and the lever of the middle rollers against hit an underlying stop. The fall way the lever is adjusted so that there are nips set from 5 to 10 mm. To this column after close the insertion of the paper web usually used a hydraulic cylinder, the Bottom roller and then the others middle roller lifts until all gaps are closed are. According to the invention, there is a separate one for each roller Drive used, the peripheral speed of the brings each roller to web speed. Thereby will tear off the paper web when closing the Roller nips excluded.

    Die beheizbaren Walzen müssen so gestaltet sein, daß eine gute Wärmeübertragung von einem Heizmedium an die Papierbahn erfolgen kann. Denn eine gleichmäßige Erwärmung der Papierbahn ist für den Satinageprozeß wesentlich. Den besten und über die Walzenbreite gleichmäßigsten Wärmeübergang durch Konvektion von einem Wärmeträger an die Walzeninnenwand bietet Wasserdampf, der zudem in jeder Papierfabrik in ausreichendem Maße zur Verfügung steht. Die Heizwalzen können auch mit peripheren Bohrungen versehen sein, durch die der Dampf geleitet wird. Um ausreichende Satinageergebnisse bei hochwertigen Papieren zu erzielen, ist es von Vorteil, wenn wenigstens zwei beheizbare Walzen in den Kalander eingebaut sind.The heated rollers must be designed so that good heat transfer from a heating medium to the Paper web can be done. Because even heating the paper web is essential for the calendering process. The best and most even across the roller width Heat transfer by convection from a heat transfer medium to the inner wall of the roller offers water vapor, which also in every paper mill to a sufficient extent Available. The heating rollers can also be used with peripheral Be provided holes through which the steam is directed. To ensure sufficient satin results to achieve high quality paper, it is advantageous if at least two heated rollers in the calender are installed.

    Insbesondere die Beschaffenheit der elastischen Walzenbeläge ist für den erfindungsgemäßen Kalander von Bedeutung. Sie müssen erstens abriebfest sein wie die Beläge von Soft-Kalandern, um eine ausreichende Standzeit zu besitzen, da man beim Walzenwechsel ansonsten den ganzen Papierherstellungsprozeß unterbrechen müßte. Zweitens müssen sie von hoher Markierungsresistenz sein, da Beschädigungen der Walzenbeläge sich im Papier sofort bemerkbar machen. Und drittens muß der Belag so beschaffen sein, daß er durch die Anstellung einer Schaberklinge zum Reinigen der Walzen nicht zerstört wird. Zur Realisierung dieser drei Forderungen eignet sich nur ein Kunststoffbelag.In particular, the nature of the elastic roller coverings is important for the calender according to the invention. First, they have to be wear-resistant like that Coverings from soft calenders to ensure a sufficient service life to own, because otherwise you change the roller would have to interrupt the whole paper making process. Second, they need to be highly marking resistant be damaged in the paper immediately noticeable. And third, the covering has to be like this to be in a position to employ a Scraper blade not cleaned to clean the rollers becomes. Suitable for realizing these three requirements just a plastic covering.

    Um die Papierbahn durch den Kalander hindurchzuleiten, bedarf es einer zusätzlichen Vorrichtung zum Einziehen eines Einführstreifens, da ähnlich wie beim Superkalander die Papierbahn nach einem Walzenspalt um eine Umlenkwalze in den nächsten Walzenspalt geführt wird, und das - anders als beim Superkalander - mit Papiermaschinengeschwindigkeitsvorgaben. Eine solche Vorrichtung zum Einziehen eines Einführstreifens können beispielsweise zwei parallel zum gewünschten Papierverlauf mitlaufende Seile sein, zwischen die ein von der Papierbahn geschnittener Einführstreifen eingeklemmt wird. Dies geschieht, indem die beiden Seile vor dem Kalander zusammengeführt werden, eine sogenannte Seilschere bilden, gemeinsam über Seilrollen gemäß dem gewünschten Papierlauf durch den Kalander geführt werden und sich nach dem Kalander wieder öffnen, um den Einführstreifen wieder freizugeben. Der Einführstreifen, der eine Breite von 300 bis 500 mm haben kann, wird vor dem Kalander seitlich von der aus der Papiermaschine kommenden Bahn geschnitten. Während dieser Einführstreifen dann durch den Kalander bis beispielsweise zu einer Aufwicklung geführt wird, wird der größte Teil der Papierbahn in einen Pulper geleitet. Erst nach Beendigung des Einziehvorgangs des Einführstreifens wird der Einführstreifen durch eine Bewegung des Messers immer breiter geschnitten, bis schließlich die volle Breite der Papierbahn durch den Kalander geführt wird.To guide the paper web through the calender, an additional retraction device is required of an insertion strip, as similar to the super calender the paper web after a nip around a deflecting roller is guided into the next nip, and this - unlike the supercalender - with paper machine speed specifications. Such a device for pulling in an insertion strip, for example two parallel to the desired paper path Be ropes, between the one of the paper web cut insertion strip is pinched. This is done by placing the two ropes in front of the calender be brought together, form a so-called rope scissors, together via pulleys according to the desired Paper run through the calender and out after the calender open again to the insertion strip to release again. The insertion strip, which is a width can have from 300 to 500 mm before the calender to the side of the web coming out of the paper machine cut. Then through this insertion strip the calender up to a rewinder, for example most of the paper web is led in directed a pulper. Only after completion of the pull-in process of the lead strip becomes the lead strip by moving the knife ever wider cut until finally the full width of the paper web is led through the calender.

    Zusätzlich zu Seilen werden Einziehvorrichtungen verwendet, die nach folgendem Prinzip arbeiten. Der Einführstreifen wird auf ein endloses perforiertes Tragband, welches annähernd mit Papier-oder Streichmaschinengeschwindigkeit um zwei Rollen läuft, von denen wenigstens eine angetrieben ist, geleitet. Ein Saugkasten unterhalb des Tragbandes bewirkt, daß die Papierbahn auf dem Tragband haftet und mit dem laufenden Band mitgeführt wird.In addition to ropes, retractors are used used that work according to the following principle. The Lead strip is perforated on an endless Carrying tape, which is approximately with paper or Coating machine speed runs around two rolls, at least one of which is driven. A suction box below the conveyor belt causes the paper web adheres to the carrier tape and with the running tape is carried.

    Zusätzliche Einführhilfen können auch noch Luftdüsen oder Luftleitbleche bekannter Bauart sein.Additional insertion aids can also be air jets or air baffles of known design.

    Nachstehend soll ein Ausführungsbeispiel eines erfindungsgemäßen Kalanders anhand der Zeichnung beschrieben werden.Below is an embodiment of an inventive Calender described using the drawing become.

    Der Kalander (1) besitzt acht Walzen (2 bis 9), von denen vier Walzen (2, 4, 7, 9) eine harte metallische Oberfläche und vier Walzen (3, 5, 6, 8) einen elastischen Kunststoffbelag (13) aufweisen. Alle Walzen sind mit ihren Walzenzapfen in Lagergehäusen (23, 23') gelagert. Die Lagergehäuse (23') der mittleren Walzen (3, 4, 5, 6, 7, 8) sind an Hebeln (24) angebracht, deren Drehpunkt (25) sich am Kalandergestell (26) befindet. Es ist ein Hydraulikzylinder (27) vorgesehen, der einerseits die für die Satinage nötigen Kräfte im geschlossenen Walzenspalt aufbringt und andererseits die Unterwalze (9) absenken kann. Durch das Absenken der Unterwalze (9) legen sich die Hebel (24) auf Anschlägen (28) ab, und zwar in der Weise, daß sich zwischen den Walzen Spalte von 5 bis 10 mm bilden. Dadurch wird der Einziehvorgang des Einführstreifens (21) ermöglicht. Die Zeichnung zeigt den Zustand des Kalanders nach erneutem Schließen der Walzen, was durch Ausfahren des Hydraulikzylinders (27) geschieht. In diesem Ausführungsbeispiel kann den beiden mittleren harten Walzen (4, 7) in nicht dargestellter Weise Heizdampf zur Beheizung zugeführt werden. Der Heizdampf wird durch periphere Bohrungen (22) geleitet, damit er seine Wärme an die Walze abgeben kann. Symbolisch sind vor dem Kalander (1) der vorangehende Teil der Papiermaschine (10) und nach dem Kalander (1) der folgende Teil der Papiermaschine (11), beispielsweise eine Aufwicklung, nur als Kasten dargestellt. Jede der im Kalander befindlichen Walzen (2 bis 9) besitzt einen eigenen Antrieb (12). Beispielhaft ist an einer elastischen Walze (3) ein handelsüblicher Schaber (14) installiert. In der Praxis müßte ein solcher Schaber (14) an der Mehrzahl der elastischen Walzen (3, 5, 6, 8) installiert werden. Zwei endlose mitlaufende Seile (15, 16) sind so über Seilrollen (17) geführt, daß sie vor dem Kalander eine Seilschere (29) bilden, die einen von dem vorangehenden Teil der Papiermaschine (10) kommenden Einführstreifen (21) zwischen sich einklemmen kann. Die Seile (15, 16) führen den Einführstreifen durch den Kalander und geben ihn nach dem Kalander (1) frei für den nachfolgenden Teil der Papiermaschine (11). In diesem Ausführungsbeispiel ist zusätzlich zu den Seilen an beispielhafter Stelle ein Tragband (18) eingezeichnet. Es ist perforiert und läuft um zwei Tragrollen (19), von denen eine in nicht dargestellter Weise angetrieben ist. Unter dem den Einführstreifen (21) tragenden Teil des Tragbandes (18) befindet sich ein Saugkasten (20), in dem in nicht dargestellter Weise ein Unterdruck erzeugt wird. In Richtung des Tragbandes (18) ist der Saugkasten (20) offen, so daß der Einführstreifen (21) durch die Perforation des Tragbandes (18) angesaugt wird und an dem Tragband haftet.The calender (1) has eight rollers (2 to 9), from which four rollers (2, 4, 7, 9) a hard metallic Surface and four rollers (3, 5, 6, 8) an elastic Have plastic covering (13). All rollers are stored with their roller journals in bearing housings (23, 23 '). The bearing housings (23 ') of the middle rollers (3, 4, 5, 6, 7, 8) are attached to levers (24), the The fulcrum (25) is located on the calender frame (26). A hydraulic cylinder (27) is provided, on the one hand the forces required for satinizing in the closed Nip and on the other hand the Lower roller (9) can lower. By lowering the Lower roller (9) lay the levers (24) on stops (28) in such a way that between the Roll to form gaps of 5 to 10 mm. This will make the Pulling the insertion strip (21) allows. The drawing shows the condition of the calender after another Closing the rollers, what by extending the Hydraulic cylinder (27) happens. In this embodiment can the two middle hard rollers (4, 7) heating steam for heating in a manner not shown are fed. The heating steam is through peripheral Drilled holes (22) so that it gets its heat can deliver to the roller. Are symbolic in front of the calender (1) the preceding part of the paper machine (10) and after the calender (1) the following part of the Paper machine (11), for example a winder, only shown as a box. Any of those in the calender Rollers (2 to 9) have their own drive (12). An example is an elastic roller (3) a commercially available scraper (14) is installed. In in practice, such a scraper (14) would have to be used on the majority the elastic rollers (3, 5, 6, 8) installed become. Two endless traveling ropes (15, 16) are like this guided over pulleys (17) that they in front of the calender form a rope cutter (29) which is one of the preceding Part of the paper machine (10) coming entry strips (21) can get caught between them. The ropes (15, 16) guide the insertion strip through the calender and release it after the calender (1) for the next one Part of the paper machine (11). In this embodiment is exemplary in addition to the ropes Place a carrier tape (18). It is perforated and runs around two idlers (19), from which are driven in a manner not shown is. Under the part carrying the insertion strip (21) there is a suction box (20) of the carrying band (18), generates a vacuum in a manner not shown becomes. In the direction of the carrier tape (18) Suction box (20) open so that the insertion strip (21) sucked through the perforation of the carrier tape (18) is and adheres to the strap.

    Claims (3)

    1. Papermaking or coating machine having a calender
      (1) arranged within this machine, with rolls (2 to 9) which are arranged one above another, are mounted in roll bearings and of which at least 40% have a resilient covering, having the following features:
      a) the calender (1) comprises more than four rolls (2 to 9) arranged one above another,
      b) each of the rolls (2 to 9) of the calender (1) has its own drive (12),
      c) the calender has at least two rolls that can be heated,
      d) the coverings of the resilient rolls (3,5,6,8) consist of a plastic that is resistant to marking and permits a doctor blade (14) to be set on it,
      characterized by the following feature:
      e) the calender (1) has an apparatus for threading a paper threading strip (21), which apparatus has two ropes (15, 16) which run together and clamp the paper threading strips (21) between them, and perforated supporting belts (18), which are arranged in the calender (1), running at approximately the papermaking or coating machine speed and under which a suction box (20) is arranged.
    2. Machine according to Claim 1, characterized in that at least the central roll bearings (23') are connected to the calender frame (26) via levers (24).
    3. Machine according to Claim 1 or 2, characterized in that the rolls (4, 7) that can be heated are steam-heated.
    EP96117572A 1995-11-21 1996-11-02 Calender in a paper- or coating machine Expired - Lifetime EP0775777B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE29518424U DE29518424U1 (en) 1995-11-21 1995-11-21 Calender in a paper or coating machine
    DE29518424U 1995-11-21

    Publications (3)

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    EP0775777A2 EP0775777A2 (en) 1997-05-28
    EP0775777A3 EP0775777A3 (en) 1998-04-29
    EP0775777B1 true EP0775777B1 (en) 2003-06-18

    Family

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    EP96117572A Expired - Lifetime EP0775777B1 (en) 1995-11-21 1996-11-02 Calender in a paper- or coating machine

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    US (1) US5784955A (en)
    EP (1) EP0775777B1 (en)
    JP (1) JP3036585B2 (en)
    CA (1) CA2188607C (en)
    DE (2) DE29518424U1 (en)

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    US20040134361A1 (en) * 1996-12-06 2004-07-15 Eduard Kusters Maschinenfabrik Gmbh & Co. Kg Calender
    US7357072B2 (en) 1996-12-06 2008-04-15 Eduard Kusters Maschinefabrik Gmbh & Co. Kg Calender
    DE19650576C2 (en) 1996-12-06 2001-02-15 Kuesters Eduard Maschf calender
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    FI108056B (en) * 1997-11-04 2001-11-15 Metso Paper Inc Calender threading arrangement
    JP2001523775A (en) * 1997-11-14 2001-11-27 ヴァルメット コーポレイション Production method of calendered paper
    DE19757474A1 (en) * 1997-12-23 1999-06-24 Voith Sulzer Papiertech Patent Paper calender
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    DE19803323C2 (en) * 1998-01-29 2003-06-05 Voith Paper Patent Gmbh Process for influencing a web material, such as paper, and calender for carrying out the process
    US7096779B2 (en) 1998-03-17 2006-08-29 Eduard Küsters Maschinenfabrik GmbH & Co. KG Calender arrangement
    US20030126998A1 (en) * 1998-03-17 2003-07-10 Eduard Kusters Maschinenfabrik Gmbh & Co. Kg Calender arrangement
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    Also Published As

    Publication number Publication date
    EP0775777A2 (en) 1997-05-28
    US5784955A (en) 1998-07-28
    DE59610537D1 (en) 2003-07-24
    JP3036585B2 (en) 2000-04-24
    DE29518424U1 (en) 1996-03-14
    EP0775777A3 (en) 1998-04-29
    CA2188607C (en) 1999-05-11
    JPH09170189A (en) 1997-06-30
    CA2188607A1 (en) 1997-05-22

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