EP2474665B1 - Yankee cylinder for a tissue paper machine - Google Patents
Yankee cylinder for a tissue paper machine Download PDFInfo
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- EP2474665B1 EP2474665B1 EP12150696.8A EP12150696A EP2474665B1 EP 2474665 B1 EP2474665 B1 EP 2474665B1 EP 12150696 A EP12150696 A EP 12150696A EP 2474665 B1 EP2474665 B1 EP 2474665B1
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- Prior art keywords
- roller body
- yankee cylinder
- cylinder according
- hard material
- layer
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/021—Construction of the cylinders
Definitions
- the invention relates to a Yankee cylinder for a tissue paper machine.
- Drying cylinders for tissue paper machines usually have a hollow roll body, which is poured for usually gray-solidifying cast iron with lamellar graphite.
- the roll body can also be produced by welding steel sheet.
- the hollow cast iron body is usually subjected to a water vapor pressure of about 10 bar.
- Such drying cylinders are used in the dewatering of fibrous materials (tissue material) from which, for example, paper or cellulose products such as absorbent and soft kitchen towels, toilet paper, baby diapers, crepe paper or the like is produced.
- fibrous materials tissue material
- a so-called doctor blade abuts on the outer circumferential surface of the roll body, whereby the paper is stripped and crimped from the peripheral surface of the cylinder.
- a hard material layer may be provided on the outer peripheral surface of the roller body.
- a hard material layer is understood as meaning a layer of a hard material which has a greater hardness than the material of the roller body.
- a Yankee cylinder and a method for coating a Yankee cylinder are described.
- the cladding coating is applied directly to the surface of the shell, which is made of cast iron or steel.
- an intermediate layer of a martensitic stainless steel is first applied to the mantle surface of the Yankee cylinder, which is then again coated again.
- the roller has a metal core or metal body on which a relatively soft inner layer and a relatively hard outer layer are applied. Both the inner and outer layers are made of solid rubber.
- the object of the invention is to provide a coated drying cylinder with improved dry properties for a tissue paper machine, which can be produced inexpensively and procedurally simple.
- a drying cylinder for a tissue paper machine in particular a Yankee cylinder, comprises a hollow roll body of gray cast iron (GJS) with freely embedded graphite, which is present at least substantially as spheroidal graphite, wherein on a outer peripheral surface of the roll body a hard material layer is applied.
- GJS gray cast iron
- the cast structure of the roller body is advantageously also in its radially outer region predominantly, preferably at least substantially gray, so solidified solid.
- Gray solidified cast iron with free embedded graphite advantageously has a higher thermal conductivity than white solidified cast iron, whereby the dry properties of the drying cylinder can be improved.
- the drying process can thus be made more energy-efficient, that is cheaper and more environmentally friendly.
- Gray cast iron can also be better worked than white, in particular, including boring.
- the roll body may have a diameter of at least 1.5 m and preferably at most 7 m, preferably at least 4 m and preferably at most 6 m.
- the roll body may have a length of at least 2 m and preferred not more than 9 m, preferably of at least 4 m and advantageously not more than 7 m.
- the roll body can have a shell thickness of at least 20 mm and preferably at most 150 mm, preferably at least 40 mm and in particular at most 100 mm.
- the roller body can form a pressure vessel, which can be acted upon by a pressure, in particular a water vapor pressure, of preferably up to 15 bar.
- the shell thickness of the roll body can be adapted to the water vapor pressure to be resisted in order to comply with legal requirements for pressure vessels.
- At least one rib in particular a circumferential rib may be arranged on an inner surface of the roller body.
- Such ribs provide greater heat transfer and at the same time for a stiffening of the roll body.
- a plurality of ribs in particular at the same distance from one another, are arranged on the inner surface of the roller body.
- an inner cylinder preferably coaxially, can be arranged as a so-called displacer within the roller body.
- At least one spacer element can be provided between an inner surface of the roller body and an outer surface of the inner cylinder.
- a plurality of spacers are provided as axial ribs between the inner surface of the roll body and the outer surface of the inner cylinder, whereby both the heat transfer and the rigidity of the roll body can be improved.
- the roll body is produced by casting against silicon carbide bricks, preferably in a casting of silicon carbide bricks.
- the cooling rate of the cast body can be adjusted so that the melt solidifies gray even in the peripheral edge zone of the roll body.
- the gray-solidified cast iron of the roll body can have a saturation degree S c of at least 0.8 and at most 1.1, preferably of at least 0.96 and at most 1.003.
- the graphite spheres of spheroidal graphite have an average diameter of at least 0.01 mm and at most 0.1 mm, preferably of at least 0.02 and at most 0.04 mm.
- the precipitation of the graphite in the form of only such small graphite balls is advantageous for the mechanical strength and can be achieved in the casting process by adding seed elements. By a targeted adjustment of the cooling rate, the size of the graphite balls can be controlled.
- Spheroidal Graphite Cast Iron has higher strength and higher elongation than cast iron with lamellar graphite (GJL). For this reason, the safety factor for spheroidal graphite cast iron (GJS) is lower, so that lower shell thickness of the roll body can be implemented. Lower jacket thicknesses in turn lead to a lower mass moment of inertia of the drying cylinder, resulting in a more favorable energy balance.
- the proportion of spheroidal graphite on freely stored graphite at least 80 wt.%, Preferably at least 90 wt.%, Amount.
- the hard material layer may have a thickness of at least 0.01 mm and preferably at most 1 mm, preferably at least 0.1 mm and in particular at most 0.5 mm.
- the hard material layer may comprise a ceramic material, preferably tungsten carbide, or nickel or chromium.
- the word "or” is understood in the usual logical sense and therefore as an “inclusive or”, thus includes both the meaning of "either ... or” as well as the meaning of "and”, as far as the respective concrete context exclusively opens only a limited meaning.
- the hard material layer may comprise a ceramic material, nickel or chromium as a single compound or more of these materials in combination.
- the hard material layer can be applied by means of flame spraying or plasma spraying.
- Flame or plasma spraying are procedural suitable surface treatments with which articles of different geometry and dimensions can be coated. Especially for a very large-sized roll body, these coating methods have been found to be advantageous.
- hard material can be deposited galvanically, electrolytically or autocatalytically on the outer circumferential surface of the roller body.
- the hollow roll body is made by casting cast iron.
- silicon carbide bricks or other cooling materials may be used.
- the casting parameters, such. Thickness of the mold, mold material, inoculant, as well as the cooling rate are adjusted so that the cast iron solidifies as a gray cast iron with spherical spheroidal graphite (GJS).
- GJS gray cast iron with spheroidal graphite
- the invention therefore also relates to a method for producing a drying cylinder in which a hollow roll body is cast from a cast iron, wherein the cast iron solidifies as gray cast iron with spheroidal graphite (GJS), and a hard material layer is applied to the outer peripheral surface of the roll body.
- a hollow roll body 1 of a drying cylinder for a tissue paper machine is shown in a cross section.
- the roller body 1 has a diameter of preferably at least 4 m and at most 6 m and a length of preferably at least 4 m and at most 7 m.
- the shell thickness of the roll body is preferably at least 40 mm and at most 100 mm.
- the roller body 1 is a cast body of gray cast iron (GJS) with freely embedded graphite, which is present at least substantially as spheroidal graphite.
- GJS gray cast iron
- the schematic detail view shown next to the cross section of the roller body 1 illustrates that the hollow roller body consists of gray-solidified cast iron with finely distributed graphite balls 6.
- a hard material layer 4 is applied, which has a thickness of preferably at least 0.1 mm and preferably at most 0.5 mm.
- the hard material layer 4 is advantageously applied by means of flame spraying or plasma spraying of ceramic material.
- the hard material layer 4 may comprise galvanically, electrolytically or autocatalytically deposited nickel or chromium or their compounds.
- the cavity of the roller body 1 can be subjected to a water vapor pressure of at least 2 bar, preferably at least 10 bar.
- the hollow roller body 1 thus forms a pressure vessel.
- circumferential ribs 7 are arranged on an inner surface 5 of the roller body 1 for improving the heat transfer and rigidity of the roller body 1.
- the circumferential ribs 7 are preferably machined in one piece from the material of the roller body 1.
- the circumferential ribs 7 are arranged at the same distance from each other.
- an inner cylinder can be arranged coaxially as a displacer within the roller body 1.
- the inner cylinder By means of the inner cylinder, the water vapor pressure to be acted upon volume of the roller body 1 can be reduced.
- a plurality of axially arranged spacer elements may be provided between the inner surface 5 of the roller body 1 and the outer surface of the inner cylinder. The Distance elements can advantageously improve both the heat transfer and the rigidity of the roll body 1.
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Description
Die Erfindung betrifft einen Yankee-Zylinder für eine Tissue-Papiermaschine.The invention relates to a Yankee cylinder for a tissue paper machine.
Trockenzylinder für Tissue-Papiermaschinen, auch Yankee-Zylinder genannt, weisen üblicherweise einen hohlen Walzenkörper auf, welcher für gewöhnlich grau erstarrendem Gusseisen mit Lamellengraphit gegossen wird. Alternativ kann der Walzenkörper auch durch Schweißen von Stahlblech hergestellt werden. Im Betrieb des Trockenzylinders wird der hohle Walzenkörper aus Gusseisen üblicherweise mit einem Wasserdampfdruck von etwa 10 bar beaufschlagt.Drying cylinders for tissue paper machines, also called Yankee cylinders, usually have a hollow roll body, which is poured for usually gray-solidifying cast iron with lamellar graphite. Alternatively, the roll body can also be produced by welding steel sheet. During operation of the drying cylinder, the hollow cast iron body is usually subjected to a water vapor pressure of about 10 bar.
Derartige Trockenzylinder werden bei der Entwässerung von Faserstoffen (Tissue-Material) verwendet, aus denen beispielsweise Papier- bzw. Zellulosewaren wie etwa saugfähige und weiche Küchentücher, Toilettenpapier, Baby-Windeln, Krepppapier oder dergleichen hergestellt wird. Beim Herstellungsprozess liegt ein so genanntes Abstreifmesser an der äußeren Umfangsfläche des Walzenkörpers an, wobei das Papier von der Umfangsfläche des Zylinders abgestreift und gefaltet bzw. gekräuselt wird.Such drying cylinders are used in the dewatering of fibrous materials (tissue material) from which, for example, paper or cellulose products such as absorbent and soft kitchen towels, toilet paper, baby diapers, crepe paper or the like is produced. In the manufacturing process, a so-called doctor blade abuts on the outer circumferential surface of the roll body, whereby the paper is stripped and crimped from the peripheral surface of the cylinder.
Bei diesem Prozess trägt das Abstreifmesser Material von der Umfangsfläche, insbesondere von den Kanten des Walzenkörpers, ab. Aus diesem Grund müssen Trockenzylinder gelegentlich abgeschliffen werden. Durch häufiges Abschleifen kann die Manteldicke des Trockenzylinders eine Grenze erreichen, die behördlicherweise für Druckbehälter festgelegt ist. In diesem Zustand muss der Trockenzylinder üblicherweise ausgetauscht werden. Um die Lebensdauer des Trockenzylinders zu erhöhen kann auf der äußeren Umfangsfläche des Walzenkörpers eine Hartstoffschicht vorgesehen sein. Als Hartstoffschicht wird eine Schicht aus einem Hartstoffmaterial verstanden, welches eine größere Härte als das Material des Walzenkörpers aufweist.In this process, the doctor blade carries material from the peripheral surface, in particular from the edges of the roll body from. For this reason, drying cylinders must occasionally be sanded down. Frequent sanding can cause the jacket drum's jacket thickness to reach a limit officially set for pressure vessels. In this condition, the drying cylinder usually needs to be replaced. In order to increase the service life of the drying cylinder, a hard material layer may be provided on the outer peripheral surface of the roller body. A hard material layer is understood as meaning a layer of a hard material which has a greater hardness than the material of the roller body.
In der
Aus der
Die Aufgabe der Erfindung besteht darin, einen beschichteten Trockenzylinder mit verbesserten Trockeneigenschaften für eine Tissue-Papiermaschine bereitzustellen, welcher kostengünstig und verfahrenstechnisch einfach hergestellt werden kann.The object of the invention is to provide a coated drying cylinder with improved dry properties for a tissue paper machine, which can be produced inexpensively and procedurally simple.
Gemäß der Erfindung umfasst ein Trockenzylinder für eine Tissue-Papiermaschine, insbesondere ein Yankee-Zylinder, einen hohlen Walzenkörper aus grau erstarrtem Gusseisen (GJS) mit frei eingelagertem Graphit, welcher zumindest im Wesentlichen als Kugelgraphit vorliegt, wobei auf einer äußeren Umfangsfläche des Walzenkörpers eine Hartstoffschicht aufgebracht ist. Das Gussgefüge des Walzenkörpers ist vorteilhafterweise auch in seinem radial äußeren Bereich überwiegend, vorzugsweise zumindest im Wesentlichen grau, also stabil erstarrt. Grau erstarrtes Gusseisen mit frei eingelagertem Graphit weist vorteilhaft eine höhere Wärmeleitfähigkeit als weiß erstarrtes Gusseisen auf, wodurch die Trockeneigenschaften des Trockenzylinders verbessert werden. Der Trockenprozess kann somit energieeffizienter, also kostengünstiger und umweltfreundlicher, gestaltet werden. Graues Gusseisen kann auch besser bearbeitet werden als weißes, insbesondere spanend einschließlich Bohren.According to the invention, a drying cylinder for a tissue paper machine, in particular a Yankee cylinder, comprises a hollow roll body of gray cast iron (GJS) with freely embedded graphite, which is present at least substantially as spheroidal graphite, wherein on a outer peripheral surface of the roll body a hard material layer is applied. The cast structure of the roller body is advantageously also in its radially outer region predominantly, preferably at least substantially gray, so solidified solid. Gray solidified cast iron with free embedded graphite advantageously has a higher thermal conductivity than white solidified cast iron, whereby the dry properties of the drying cylinder can be improved. The drying process can thus be made more energy-efficient, that is cheaper and more environmentally friendly. Gray cast iron can also be better worked than white, in particular, including boring.
Insbesondere kann der Walzenkörper einen Durchmesser von mindestens 1,5 m und vorzugsweise höchstens 7 m, bevorzugt von mindestens 4 m und vorzugsweise höchstens 6 m, aufweisen. Der Walzenkörper kann eine Länge von mindestens 2 m und bevorzugt höchstens 9 m, bevorzugt von mindestens 4 m und vorteilhafterweise höchstens 7 m, aufweisen. Des Weiteren kann der Walzenkörper eine Manteldicke von mindestens 20 mm und bevorzugt höchstens 150 mm, bevorzugt von mindestens 40 mm und insbesondere höchstens 100 mm, aufweisen. Der Walzenkörper kann einen Druckbehälter bilden, der mit einem Druck, insbesondere einem Wasserdampfdruck, von bevorzugt bis zu 15 bar beaufschlagbar sein kann. Die Manteldicke des Walzenkörpers kann dem zu widerstehenden Wasserdampfdruck entsprechend angepasst sein, um gesetzlichen Vorschriften für Druckbehälter zu genügen.In particular, the roll body may have a diameter of at least 1.5 m and preferably at most 7 m, preferably at least 4 m and preferably at most 6 m. The roll body may have a length of at least 2 m and preferred not more than 9 m, preferably of at least 4 m and advantageously not more than 7 m. Furthermore, the roll body can have a shell thickness of at least 20 mm and preferably at most 150 mm, preferably at least 40 mm and in particular at most 100 mm. The roller body can form a pressure vessel, which can be acted upon by a pressure, in particular a water vapor pressure, of preferably up to 15 bar. The shell thickness of the roll body can be adapted to the water vapor pressure to be resisted in order to comply with legal requirements for pressure vessels.
In einer bevorzugten Ausführungsform kann an einer Innenfläche des Walzenkörpers wenigstens eine Rippe, insbesondere eine umlaufende Rippe angeordnet sein. Derartige Rippen sorgen für eine größere Wärmeübertragung und zugleich für eine Versteifung des Walzenkörpers. Bevorzugt sind an der Innenfläche des Walzenkörpers eine Vielzahl von Rippen, insbesondere mit gleichem Abstand zueinander, angeordnet.In a preferred embodiment, at least one rib, in particular a circumferential rib may be arranged on an inner surface of the roller body. Such ribs provide greater heat transfer and at the same time for a stiffening of the roll body. Preferably, a plurality of ribs, in particular at the same distance from one another, are arranged on the inner surface of the roller body.
In einer weiteren Ausführungsform kann innerhalb des Walzenkörpers ein Innenzylinder, bevorzugt koaxial, als so genannter Verdränger angeordnet sein. Durch die Anordnung eines Innenzylinders wird das mit Wasserdampfdruck zu beaufschlagende Volumen des Walzenkörpers vorteilhaft reduziert.In a further embodiment, an inner cylinder, preferably coaxially, can be arranged as a so-called displacer within the roller body. By arranging an inner cylinder, the volume of the roller body to be acted upon with water vapor pressure is advantageously reduced.
Bevorzugt kann zwischen einer Innenfläche des Walzenkörpers und einer Außenfläche des Innenzylinders wenigstens ein Distanzelement vorgesehen sein. Vorteilhafterweise sind eine Vielzahl von Abstandshaltern als axiale Rippen zwischen der Innenfläche des Walzenkörpers und der Außenfläche des Innenzylinders vorgesehen, wodurch sowohl die Wärmeübertragung als auch die Steifigkeit des Walzenkörpers verbessert werden kann.Preferably, at least one spacer element can be provided between an inner surface of the roller body and an outer surface of the inner cylinder. Advantageously, a plurality of spacers are provided as axial ribs between the inner surface of the roll body and the outer surface of the inner cylinder, whereby both the heat transfer and the rigidity of the roll body can be improved.
Vorteilhaft wird der Walzenkörper durch Gießen gegen Siliziumcarbid-Steine, bevorzugt in einer Gussform aus Siliziumcarbid-Steinen hergestellt. Beim Gießprozess kann die Abkühlgeschwindigkeit des Gusskörpers so eingestellt werden, dass die Schmelze auch in der Umfangsrandzone des Walzenkörpers grau erstarrt. Insbesondere kann das grau erstarrte Gusseisen des Walzenkörpers einen Sättigungsgrad Sc von mindestens 0,8 und höchstens 1,1, bevorzugt von mindestens 0,96 und höchstens 1,003, aufweisen. Der Sättigungsgrad kann mit
bestimmt werden, wobei die Prozentangaben Gewichtsprozent sind.Advantageously, the roll body is produced by casting against silicon carbide bricks, preferably in a casting of silicon carbide bricks. In the casting process, the cooling rate of the cast body can be adjusted so that the melt solidifies gray even in the peripheral edge zone of the roll body. In particular, the gray-solidified cast iron of the roll body can have a saturation degree S c of at least 0.8 and at most 1.1, preferably of at least 0.96 and at most 1.003. The saturation level can with
are determined, wherein the percentages are weight percent.
In bevorzugten Ausführungen weisen die Graphitkugeln des Kugelgraphits einen mittleren Durchmesser von mindestens 0,01 mm und höchstens 0,1 mm, bevorzugt von mindestens 0,02 und höchstens 0,04 mm, auf. Die Ausscheidung des Graphits in Form nur solch kleiner Graphitkugeln ist vorteilhaft für die mechanische Festigkeit und kann im Gießprozess durch Zugabe von Impfelementen erzielt werden. Durch eine gezielte Einstellung der Abkühlgeschwindigkeit kann die Größe der Graphitkugeln gesteuert werden.In preferred embodiments, the graphite spheres of spheroidal graphite have an average diameter of at least 0.01 mm and at most 0.1 mm, preferably of at least 0.02 and at most 0.04 mm. The precipitation of the graphite in the form of only such small graphite balls is advantageous for the mechanical strength and can be achieved in the casting process by adding seed elements. By a targeted adjustment of the cooling rate, the size of the graphite balls can be controlled.
Gusseisen mit Kugelgraphit (GJS) hat gegenüber Gusseisen mit lamellarem Graphit (GJL) eine höhere Festigkeit sowie eine höhere Dehnung. Aus diesem Grund ist der Sicherheitsbeiwert für Gusseisen mit Kugelgraphit (GJS) geringer, wodurch geringere Manteldicken des Walzenkörpers umgesetzt werden können. Geringere Manteldicken führen wiederum zu einem geringeren Massenträgheitsmoment des Trockenzylinders, was eine günstigere Energiebilanz zur Folge hat. Vorteilhaft kann der Anteil des Kugelgraphits am frei eingelagerten Graphit wenigstens 80 Gew.%, bevorzugt wenigstens 90 Gew.%, betragen.Spheroidal Graphite Cast Iron (GJS) has higher strength and higher elongation than cast iron with lamellar graphite (GJL). For this reason, the safety factor for spheroidal graphite cast iron (GJS) is lower, so that lower shell thickness of the roll body can be implemented. Lower jacket thicknesses in turn lead to a lower mass moment of inertia of the drying cylinder, resulting in a more favorable energy balance. Advantageously, the proportion of spheroidal graphite on freely stored graphite at least 80 wt.%, Preferably at least 90 wt.%, Amount.
Die Hartstoffschicht kann eine Dicke von mindestens 0,01 mm und bevorzugt höchstens 1 mm, bevorzugt von mindestens 0,1 mm und insbesondere höchstens 0,5 mm aufweisen. Insbesondere kann die Hartstoffschicht ein Keramikmaterial, bevorzugt Wolframcarbid, oder Nickel oder Chrom umfassen. Das Wort "oder" wird im üblichen logischen Sinne und somit als ein "inklusive oder" verstanden, umfasst also sowohl die Bedeutung von "entweder ... oder" als auch die Bedeutung von "und", soweit sich aus dem jeweils konkreten Zusammenhang nicht ausschließlich nur eine eingeschränkte Bedeutung erschließt. Entsprechend kann die Hartstoffschicht ein Keramikmaterial, Nickel oder Chrom als Einzelverbindung oder mehrere dieser Materialien in Kombination umfassen.The hard material layer may have a thickness of at least 0.01 mm and preferably at most 1 mm, preferably at least 0.1 mm and in particular at most 0.5 mm. In particular, the hard material layer may comprise a ceramic material, preferably tungsten carbide, or nickel or chromium. The word "or" is understood in the usual logical sense and therefore as an "inclusive or", thus includes both the meaning of "either ... or" as well as the meaning of "and", as far as the respective concrete context exclusively opens only a limited meaning. Accordingly, the hard material layer may comprise a ceramic material, nickel or chromium as a single compound or more of these materials in combination.
In einer bevorzugten Ausführungsform kann die Hartstoffschicht mittels Flammspritzen oder Plasmaspritzen aufgebracht sein. Flamm- oder Plasmaspritzen sind verfahrenstechnisch geeignete Oberflächenbehandlungen, mit denen zu beschichtende Gegenstände unterschiedlicher Geometrie und Abmessung beschichtet werden können. Gerade für einen sehr groß dimensionierten Walzenkörper haben sich diese Beschichtungsverfahren als vorteilhaft herausgestellt. Alternativ oder zusätzlich kann zur Bildung der Hartstoffschicht Hartstoffmaterial auf der äußeren Umfangsfläche des Walzenkörpers galvanisch, elektrolytisch oder autokatalytisch abgeschieden werden.In a preferred embodiment, the hard material layer can be applied by means of flame spraying or plasma spraying. Flame or plasma spraying are procedural suitable surface treatments with which articles of different geometry and dimensions can be coated. Especially for a very large-sized roll body, these coating methods have been found to be advantageous. Alternatively or additionally, to form the hard material layer, hard material can be deposited galvanically, electrolytically or autocatalytically on the outer circumferential surface of the roller body.
Der hohle Walzenkörper wird durch Gießen von Gusseisen hergestellt. Für die Gussform können Siliziumcarbid-Steine oder andere kühlenden Materialien verwendet werden. Die Gießparameter, wie z. B. Dicke der Gussform, Material der Gussform, Impfmittel, sowie die Kühlrate, werden so eingestellt, dass das Gusseisen als Grauguss mit sphärischem Kugelgraphit (GJS) erstarrt. Auf diese Weise werden die oben aufgeführten Vorteile bezüglich der verbesserten Trockeneigenschaften des Trockenzylinders erreicht. Die Erfindung betrifft daher auch ein Verfahren zur Herstellung eines Trockenzylinders, bei dem ein hohler Walzenkörper aus einem Gusseisen gegossen wird, wobei das Gusseisen als Grauguss mit Kugelgraphit (GJS) erstarrt, und an der äußeren Umfangsfläche des Walzenkörpers eine Hartstoffschicht aufgebracht wird.The hollow roll body is made by casting cast iron. For the mold, silicon carbide bricks or other cooling materials may be used. The casting parameters, such. Thickness of the mold, mold material, inoculant, as well as the cooling rate are adjusted so that the cast iron solidifies as a gray cast iron with spherical spheroidal graphite (GJS). In this way, the advantages listed above regarding the improved drying properties of the drying cylinder are achieved. The invention therefore also relates to a method for producing a drying cylinder in which a hollow roll body is cast from a cast iron, wherein the cast iron solidifies as gray cast iron with spheroidal graphite (GJS), and a hard material layer is applied to the outer peripheral surface of the roll body.
Vorteilhafte Merkmale werden ferner in den Unteransprüchen und deren Kombinationen offenbart.Advantageous features are further disclosed in the subclaims and their combinations.
Die Erfindung wird nachfolgend anhand eines bevorzugten Ausführungsbeispiels erläutert. An dem Ausführungsbeispiel offenbar werdende Merkmale bilden je einzeln und in jeder Merkmalskombination die Gegenstände der Ansprüche und auch die vorstehend erläuterten Ausgestaltungen vorteilhaft weiter. Es zeigen:
- Fig. 1
- einen Walzenkörper eines Trockenzylinders für eine Tissue-Papiermaschine in einem Querschnitt,
- Fig. 2
- den Querschnitt A-A der
Fig. 1 ,
- Fig. 1
- a roller body of a drying cylinder for a tissue paper machine in a cross section,
- Fig. 2
- the cross section AA of
Fig. 1 .
In der
Der Walzenkörper 1 ist ein Gusskörper aus grau erstarrtem Gusseisen (GJS) mit frei eingelagertem Graphit, welcher zumindest im Wesentlichen als Kugelgraphit vorliegt. Die neben dem Querschnitt des Walzenkörpers 1 dargestellte schematische Detailansicht verdeutlicht, dass der hohle Walzenkörper aus grau erstarrtem Gusseisen mit fein verteilten Graphitkugeln 6 besteht.The roller body 1 is a cast body of gray cast iron (GJS) with freely embedded graphite, which is present at least substantially as spheroidal graphite. The schematic detail view shown next to the cross section of the roller body 1 illustrates that the hollow roller body consists of gray-solidified cast iron with finely distributed
An der äußeren Umfangsfläche 3 des Walzenkörpers 1 ist eine Hartstoffschicht 4 aufgebracht, welche eine Dicke von bevorzugt wenigstens 0,1 mm und bevorzugt höchstens 0,5 mm aufweist. Die Hartstoffschicht 4 wird vorteilhaft mittels Flammenspritzen oder Plasmaspritzen von Keramikmaterial aufgetragen. Alternativ oder zusätzlich kann die Hartstoffschicht 4 galvanisch, elektrolytisch oder autokatalytisch abgeschiedenes Nickel oder Chrom oder deren Verbindungen umfassen.On the outer
Der Hohlraum des Walzenkörpers 1 kann mit einem Wasserdampfdruck von mindestens 2 bar, bevorzugt wenigstens 10 bar, beaufschlagt werden. Der hohle Walzenkörper 1 bildet somit einen Druckbehälter.The cavity of the roller body 1 can be subjected to a water vapor pressure of at least 2 bar, preferably at least 10 bar. The hollow roller body 1 thus forms a pressure vessel.
Wie aus der
In einer hier nicht dargestellten Ausführungsform kann innerhalb des Walzenkörpers 1 ein Innenzylinder als Verdränger koaxial angeordnet sein. Mittels des Innenzylinders kann das mit Wasserdampfdruck zu beaufschlagende Volumen des Walzenkörpers 1 reduziert werden. Zwischen der Innenfläche 5 des Walzenkörpers 1 und der Außenfläche des Innenzylinders können eine Vielzahl von axial angeordneten Distanzelementen vorgesehen sein. Die Distanzelemente können vorteilhaft sowohl die Wärmeübertragung als auch die Steifigkeit des Walzenkörpers 1 verbessern.In an embodiment not shown here, an inner cylinder can be arranged coaxially as a displacer within the roller body 1. By means of the inner cylinder, the water vapor pressure to be acted upon volume of the roller body 1 can be reduced. Between the
Claims (15)
- A Yankee cylinder for a tissue paper machine, comprising a hollow roller body (1) made of grey solidified cast iron GJS with freely embedded graphite which is at least substantially present as spheroidal graphite, wherein a layer of hard material (4) is applied to an outer circumferential surface (3) of the roller body (1), wherein the layer of hard material (4) is a layer made of a hard material which exhibits a greater hardness than the material of the roller body (1).
- The Yankee cylinder according to Claim 1, characterised in that the roller body (1) exhibits a diameter of at least 1.5 m and at most 7 m, preferably at least 4 m and at most 6 m.
- The Yankee cylinder according to Claim 1 or 2, characterised in that the roller body (1) exhibits a length of at least 2 m and at most 9 m, preferably at least 4 m and at most 7 m.
- The Yankee cylinder according to any one of Claims 1 to 3, characterised in that the roller body (1) exhibits a shell thickness of at least 20 mm and at most 150 mm, preferably at least 40 mm and in particular at most 100 mm.
- The Yankee cylinder according to any one of the preceding claims, characterised in that the layer of hard material (4) exhibits a thickness of at least 0.01 mm and at most 1 mm, preferably at least 0.1 mm and at most 0.5 mm.
- The Yankee cylinder according to any one of the preceding claims, characterised in that at least one fin (7), in particular a circumferential fin, is arranged on an inner surface (5) of the roller body (1).
- The Yankee cylinder according to any one of the preceding claims, characterised in that an inner cylinder is arranged within the roller body (1), preferably coaxially.
- The Yankee cylinder according to Claim 7, characterised in that at least one distancing element is provided between an inner surface (5) of the roller body (1) and an outer surface of the inner cylinder.
- The Yankee cylinder according to any one of the preceding claims, characterised in that the roller body (1) forms a pressure container to which a pressure, in particular a water vapour pressure, of preferably up to 15 bars can be applied.
- The Yankee cylinder according to any one of the preceding claims, characterised in that the grey solidified cast iron of the roller body (1) exhibits a degree of saturation (Sc) of at least 0.8 and at most 1.1, preferably at least 0.96 and at most 1.003.
- The Yankee cylinder according to any one of the preceding claims, characterised in that the graphite pebbles (6) of the spheroidal graphite exhibit an average diameter of at least 0.01 mm and at most 0.1 mm, preferably at least 0.02 mm and at most 0.04 mm.
- The Yankee cylinder according to any one of the preceding claims, characterised in that the proportion of spheroidal graphite in the freely embedded graphite is at least 80% by weight, preferably at least 90% by weight.
- The Yankee cylinder according to any one of the preceding claims, characterised in that the layer of hard material (4) comprises a ceramic material, preferably tungsten carbide, or nickel or chromium or compounds of them.
- The Yankee cylinder according to any one of the preceding claims, characterised in that the layer of hard material (4) is applied by means of flame-spraying or plasma-spraying.
- The Yankee cylinder according to any one of the preceding claims, characterised in that hard material is deposited on the outer circumferential surface (3) of the roller body (1) galvanically, electrolytically or autocatalytically, in order to form the layer of hard material (4).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL12150696T PL2474665T3 (en) | 2011-01-11 | 2012-01-11 | Yankee cylinder for a tissue paper machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202011001325U DE202011001325U1 (en) | 2011-01-11 | 2011-01-11 | Drying cylinder for a tissue paper machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2474665A1 EP2474665A1 (en) | 2012-07-11 |
EP2474665B1 true EP2474665B1 (en) | 2015-03-04 |
Family
ID=43735005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12150696.8A Not-in-force EP2474665B1 (en) | 2011-01-11 | 2012-01-11 | Yankee cylinder for a tissue paper machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2474665B1 (en) |
DE (1) | DE202011001325U1 (en) |
PL (1) | PL2474665T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11414718B2 (en) | 2017-06-01 | 2022-08-16 | Andritz Ag | Method for the surface treatment of a steel Yankee |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT17293U1 (en) * | 2020-10-21 | 2021-11-15 | Valmet Oy | YANKEE DRYING CYLINDER AND MACHINE FOR MAKING TISSUE PAPER |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI82094C (en) * | 1989-02-16 | 1997-09-09 | Valmet Corp | Anvaendning av en legering av ett metallpulver och en carbid eller nitride innefattande belaeggningskomposition Foer en i en pappersmaskin anvaendbar yankeecylinder |
US5171404A (en) * | 1990-11-30 | 1992-12-15 | S. D. Warren Company | Method and apparatus for calendering paper with internally heated roll |
US6021581A (en) * | 1998-06-22 | 2000-02-08 | Voith Sulzer Paper Technology North America, Inc. | Method of drying a paper web in a paper-making machine at speeds greater than 6000 feet per minute |
DE102004057480A1 (en) | 2004-11-19 | 2006-05-24 | Schäfer KG | Roller for the production of web material, preferably tissue material |
DE102009004562B4 (en) * | 2009-01-14 | 2015-06-03 | Shw Casting Technologies Gmbh | Roller body for a roller for treating a material and method for producing a roller body |
-
2011
- 2011-01-11 DE DE202011001325U patent/DE202011001325U1/en not_active Expired - Lifetime
-
2012
- 2012-01-11 EP EP12150696.8A patent/EP2474665B1/en not_active Not-in-force
- 2012-01-11 PL PL12150696T patent/PL2474665T3/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11414718B2 (en) | 2017-06-01 | 2022-08-16 | Andritz Ag | Method for the surface treatment of a steel Yankee |
Also Published As
Publication number | Publication date |
---|---|
DE202011001325U1 (en) | 2011-03-10 |
PL2474665T3 (en) | 2015-11-30 |
EP2474665A1 (en) | 2012-07-11 |
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