EP0889991A1 - Heated calender roller - Google Patents
Heated calender rollerInfo
- Publication number
- EP0889991A1 EP0889991A1 EP97922821A EP97922821A EP0889991A1 EP 0889991 A1 EP0889991 A1 EP 0889991A1 EP 97922821 A EP97922821 A EP 97922821A EP 97922821 A EP97922821 A EP 97922821A EP 0889991 A1 EP0889991 A1 EP 0889991A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating
- hose
- calender roll
- roll according
- carrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- D21F5/022—Heating the cylinders
- D21F5/024—Heating the cylinders using electrical means
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/02—Rolls; Their bearings
- D21G1/0253—Heating or cooling the rolls; Regulating the temperature
- D21G1/028—Heating or cooling the rolls; Regulating the temperature using electrical means
Definitions
- the invention relates to a heatable calender roll with a plurality of heating channels running in the longitudinal direction of the roll body and with one or more heating means provided in the interior of the heating channels, which pass through the heating channels and, in the rotating state of the roll, can be connected directly or inductively to a power source.
- Such electrically heatable calender rolls are known, for example, from the magazine "The Electrical Equipment” No. 2, April 20, 2006, pages 40 to 44.
- rollers are mentioned in which peripheral bores are heated electrically by means of heating cartridges. The temperature is controlled by means of water cooling in a central bore.
- rod-shaped heating elements are inserted into axially parallel channels. In order to ensure sufficient heat transfer between the heating elements and the inner wall of the peripheral channels, these are cast with a meltable metal alloy.
- the heat transfer takes place by means of a fluid heat carrier, preferably with the aid of a thermal oil which is heated in a heat exchanger is introduced into the rotating roller via rotary seals.
- the uniformity of the heating is controlled via the temperature and flow rate of the thermal oil.
- a very uniform heating of the roll surface is extremely important in such calender rolls, since e.g. For example, thickness deviations of less than 0.1 ⁇ can already lead to a defective finished product for certain plastic films.
- rollers which are usually made of cast iron, are, for. B. ground to be able to compensate for the bending caused by gravity.
- Uniform heating can often not be achieved when using thermal oil as the heat transfer medium, since this cools more or less during the flow through the heating channels and thus the heat transfer at the end of a corresponding heating channel is lower. Different thermal expansion can therefore occur in different areas, so that deviations in the thickness of the rolling stock can occur.
- thermal oil is also problematic because, at normal operating temperatures of up to about 300 ° C., it can partially crack during the course of the operating time, so that the thermal conductivity decreases.
- cracking products can thereby settle in the heating channels or on the seals, so that corresponding cross-sectional constrictions are the result or sealing problems can occur.
- the problem with this type of calender heating is the disposal of the waste oil.
- the invention has for its object to provide an electrically heatable calender roll in which there is a good heat transfer between the heating elements and the inner wall of the peripheral bores without the rolls being impaired in their dimensional stability during operation.
- the heaters are arranged on or in a hose-like carrier made of flexible plastic, in particular made of a polyorganosiloxane compound, in such a way that they can be applied to the inner circumferential surfaces of the heating channels together with the hose-like carrier with radial expansion are.
- the calender roll according to the invention can be heated extraordinarily uniformly with the aid of the electric heaters which pull through the heating channels or the tubular support for the heaters, since the electric heating elements become equally warm at every point of the heating channel. As a result, an extremely precise roller profile or a corresponding precise roller gap can be set.
- the previously used, expensive rotary seals, heat exchangers and storage containers for the thermal oil can be dispensed with, so that not only the production costs but also the operating costs of the calender rolling mills can be drastically reduced overall.
- the heating elements are applied with the aid of a plastic hose, which preferably consists of a polyorganosiloxane compound and has a smaller cross section than the heating duct.
- a hose made of this flexible plastic can be inserted into the heating channels without any problems, so that retrofitting of calender rolling mills previously heated with thermal oil is also possible.
- the outer peripheral surface of the Carrier hose pressed against the inner circumferential surface of the heating channels by pressurization. This can be done, for example, by vulcanizing or gluing the polyorganosiloxane compound to the metal surface.
- the application of pressure to the carrier hose means that there is no need for gluing or vulcanization if the ends of the carrier hose can be closed in a pressure-tight manner.
- the hose in turn also fits tightly with a high heat transfer capacity on the inner surface of the heating ducts, however, if the heating wire is defective, the carrier hose can be exchanged without any problems if the internal pressure is reduced to atmospheric pressure and As a result, the plastic tube contracts to its original diameter due to its elastic properties.
- an overpressure valve is installed at least on one side, in order to reliably prevent an inadmissible overpressure inside the heating channels or the carrier hose when the rollers are operating at too high temperatures.
- a fluorosilicone or a silicone rubber is preferably used as the polyorganosiloxane compound for producing the carrier tube.
- These types of silicone have a temperature resistance of up to approx. 300 ° C, are permanently elastic, resistant to aging and insensitive to chemicals. Besides, is the production of such hoses with the aid of an extrusion process is comparatively unproblematic, the electrical heating being able to be extruded into the wall of the hose already during hose production.
- the electrical heater is preferably designed as a radially flexible spiral wire or radially flexible wire mesh, which can be heated via a direct electrical connection or inductively.
- the heating wire preferably has an insulation coating so that, for example in the case of an electrical resistance heater, there is an extended heating path.
- the heating channels in the known calender rolls have hitherto usually been produced with the aid of boring bars which each bore the corresponding bores from the opposite end faces, the drill hole in the middle region of the roll, which was practically unavoidable, caused the borehole to be offset . Due to the flexible carrier hose, the heater can also be easily inserted in this case. If it is no longer possible to run the hose if the offset is too large, two shorter heating hoses can be inserted from the opposite end faces to the borehole offset.
- the electrical heating conductor In addition to the already mentioned extrusion of the electrical heating conductor into the hose wall, it can also be glued to the inside or outside or attached in some other way. It is preferably also possible to produce the carrier hose from an inner hose of smaller diameter and an outer hose of larger diameter, the electrical heater being arranged between the two hoses.
- the heating conductor is designed as an electrical resistance heater, it is preferably contacted with the corresponding power supply via slip rings.
- the heating conductor is designed as an electrical resistance heater, it is preferably contacted with the corresponding power supply via slip rings.
- thermocouples or thermocouples are provided on the carrier hose, the legs of which can in turn be tapped via sliding contacts to control the heating current.
- the drawing figure shows a section through the outer jacket 1 of a heatable calender roll.
- a heating duct 3 is located comparatively close below the roller surface 2, into which a carrier hose 4 is inserted, into the wall 5 of which a spiral heating wire 6 is extruded.
- the carrier tube 4 is closed in a pressure-tight manner, while its rear end 8 extends into a pressure sleeve 9, through which compressed air can be conducted into the interior 10 of the carrier tube 4, so that it inflates and is tight bears against the inner wall 11 of the heating duct 3 and glued to it.
- the pressure sleeve 9 can alternatively be closed pressure-tight with the aid of a pressure relief valve, not shown, while the heating wire 6 is contacted via slip rings, also not shown. LIST OF REFERENCE NUMERALS jacket roll surface heating duct carrier hose wall heating wire front end rear end pressure sleeve inner inner wall
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
In order to avoid the use of heat transfer fluids flowing through peripheral heating channels of heated calender rollers, supporting tubes (4) made of a soft elastic plastic are provided inside the heating channels (3). A resistance-heated or induction-heated wire (6) is extruded into the wall (5) of the supporting tubes (4).
Description
Beheizbare Kalanderwalze Heated calender roll
Die Erfindung betrifft eine beheizbare Kalanderwalze mit meh¬ reren in Längsrichtung des Walzenkörpers verlaufenden Heizka- nälen und mit einer oder mehreren im Inneren der Heizkanäle vorgesehenen, die Heizkanäle durchziehenden, in rotierendem Zustand der Walze mit einer Stromquelle direkt oder induktiv verbindbaren Heizungen.The invention relates to a heatable calender roll with a plurality of heating channels running in the longitudinal direction of the roll body and with one or more heating means provided in the interior of the heating channels, which pass through the heating channels and, in the rotating state of the roll, can be connected directly or inductively to a power source.
Derartige elektrisch beheizbare Kalanderwalzen sind beispiels¬ weise aus der Zeitschrift "Die elektrische Ausrüstung" Nr. 2, 20.04.66, Seiten 40 bis 44 bekannt. In dieser Veröffentlichung werden Walzen erwähnt, bei denen peripherische Bohrungen mit¬ tels Heizpatronen elektrisch beheizt werden. Die Temperatur- regelung erfolgt mittels einer Wasserkühlung in einer Zen¬ tralbohrung.Such electrically heatable calender rolls are known, for example, from the magazine "The Electrical Equipment" No. 2, April 20, 2006, pages 40 to 44. In this publication, rollers are mentioned in which peripheral bores are heated electrically by means of heating cartridges. The temperature is controlled by means of water cooling in a central bore.
Darüber hinaus ist es aus der DE-OS 30 33 689 AI bekannt, Kalanderwalzen mittels Heizmatten elektrisch zu beheizen. Dabei können für niedrige Temperaturen die Heizdrähte in Sili¬ konmasse eingegossen sein.In addition, it is known from DE-OS 30 33 689 AI to heat calender rolls electrically by means of heating mats. For low temperatures, the heating wires can be cast in silicone mass.
Bei den aus der DE-OS 43 19 868 bekannten Kalanderwalzen wer¬ den stabförmige Heizelemente in achsparallele Kanäle einge- schoben. Um einen ausreichenden Wärmeübergang zwischen den Heizelementen und der inneren Wandung der peripheren Kanäle zu gewährleisten, werden diese mit einer schmelzbaren Metallegie¬ rung ausgegossen.In the calender rolls known from DE-OS 43 19 868, rod-shaped heating elements are inserted into axially parallel channels. In order to ensure sufficient heat transfer between the heating elements and the inner wall of the peripheral channels, these are cast with a meltable metal alloy.
Bei diesen Kalanderwalzen besteht jedoch die Gefahr von Ver¬ werfungen durch die Wärmeausdehnungen der Metallegierung, außerdem muß für die Heizelemente eine isolierende Beschich¬ tung vorgesehen sein, da sonst der Heizstrom die gesamte Walze beaufschlagen würde.With these calender rolls, however, there is a risk of warping due to the thermal expansion of the metal alloy. In addition, an insulating coating must be provided for the heating elements, since otherwise the heating current would affect the entire roll.
Bei anderen beheizbaren Kalanderwalzen erfolgt die Wärmeüber¬ tragung mittels eines fluiden Wärmeträgers, vorzugsweise mit Hilfe eines in einem Wärmetauscher erhitzten Thermoöles, das
über Rotationsdichtungen in die rotierende Walze eingeleitet wird.In the case of other heatable calender rolls, the heat transfer takes place by means of a fluid heat carrier, preferably with the aid of a thermal oil which is heated in a heat exchanger is introduced into the rotating roller via rotary seals.
Beim Einsatz von Thermoöl wird die Gleichmäßigkeit der Erwär- mung über die Temperatur und Durchflußmenge des Thermoöles gesteuert. Eine sehr gleichmäßige Erwärmung der Walzenober¬ fläche ist bei derartigen Kalanderwalzen außerordentlich wich¬ tig, da z. B. bei bestimmten Kunststoffolien bereits Dicken¬ abweichungen von weniger als 0,1 μ zu einem fehlerhaften Fer- tigerzeugnis führen können.When using thermal oil, the uniformity of the heating is controlled via the temperature and flow rate of the thermal oil. A very uniform heating of the roll surface is extremely important in such calender rolls, since e.g. For example, thickness deviations of less than 0.1 μ can already lead to a defective finished product for certain plastic films.
Um derartig geringe Toleranzen gewährleisten zu können, sind die üblicherweise aus Hartguß bestehenden Walzen z. B. ballig geschliffen, um die durch die Schwerkraft stattfindende Durch- biegung kompensieren zu können.In order to be able to ensure such small tolerances, the rollers, which are usually made of cast iron, are, for. B. ground to be able to compensate for the bending caused by gravity.
Eine gleichmäßige Erwärmung ist bei der Verwendung von Thermo¬ öl als Wärmeträger jedoch häufig nicht zu erreichen, da dieses sich während des Durchflusses durch die Heizkanäle mehr oder weniger stark abkühlt und somit der Wärmeübergang am Ende eines entsprechenden Heizkanales geringer ist. Es kann daher zu unterschiedlicher thermischer Ausdehnung in unterschiedli¬ chen Bereichen kommen, so daß Dickenabweichungen des Walzgutes auftreten können.Uniform heating can often not be achieved when using thermal oil as the heat transfer medium, since this cools more or less during the flow through the heating channels and thus the heat transfer at the end of a corresponding heating channel is lower. Different thermal expansion can therefore occur in different areas, so that deviations in the thickness of the rolling stock can occur.
Die Verwendung von Thermoöl ist darüber hinaus deswegen pro¬ blematisch, weil dieses bei den üblichen Betriebstemperaturen bis etwa 300 °C im Laufe der Betriebsdauer teilweise vercrak- ken kann, so daß die Wärmeleitfähigkeit abnimmt.The use of thermal oil is also problematic because, at normal operating temperatures of up to about 300 ° C., it can partially crack during the course of the operating time, so that the thermal conductivity decreases.
Außerdem können sich dadurch Vercrackungsprodukte in den Heiz¬ kanälen bzw. an den Dichtungen absetzen, so daß entsprechende Querschnittsverengungen die Folge sind bzw. Dichtigkeitspro¬ bleme auftreten können.In addition, cracking products can thereby settle in the heating channels or on the seals, so that corresponding cross-sectional constrictions are the result or sealing problems can occur.
Problematisch ist bei dieser Art der Kalanderbeheizung weiter¬ hin die Entsorgung des Altöles.
Der Erfindung liegt die Aufgabe zugrunde, eine elektrisch beheizbare Kalanderwalze zu schaffen, bei der ein guter Wärme¬ übergang zwischen den Heizelementen und der inneren Wandung der peripheren Bohrungen gegeben ist, ohne daß die Walzen beim Betrieb in ihrer Maßhaltigkeit beeinträchtigt werden.The problem with this type of calender heating is the disposal of the waste oil. The invention has for its object to provide an electrically heatable calender roll in which there is a good heat transfer between the heating elements and the inner wall of the peripheral bores without the rolls being impaired in their dimensional stability during operation.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Heizungen an oder in einem schlauchartigen Träger aus weiche¬ lastischem Kunststoff, insbesondere aus einer Polyorganosilo- xanverbindung, derart angeordnet sind, daß sie unter radialer Aufweitung zusammen mit dem schlauchartigen Träger an die inneren Umfangsflachen der Heizkanäle anlegbar sind.This object is achieved in that the heaters are arranged on or in a hose-like carrier made of flexible plastic, in particular made of a polyorganosiloxane compound, in such a way that they can be applied to the inner circumferential surfaces of the heating channels together with the hose-like carrier with radial expansion are.
Die erfindungsgemäße Kalanderwalze kann mit Hilfe der die Heizkanäle durchziehenden elektrischen Heizungen bzw. dem schlauchartigen Träger für die Heizungen außerordentlich gleichmäßig erwärmt werden, da die elektrischen Heizelemente an jeder Stelle des Heizkanales gleich warm werden. Dadurch kann ein äußerst präzises Walzenprofil bzw. ein entsprechender präziser Walzenspalt eingestellt werden.The calender roll according to the invention can be heated extraordinarily uniformly with the aid of the electric heaters which pull through the heating channels or the tubular support for the heaters, since the electric heating elements become equally warm at every point of the heating channel. As a result, an extremely precise roller profile or a corresponding precise roller gap can be set.
Mit den elektrischen Heizelementen kann auf die bisher verwen¬ deten, teuren Rotationsdichtungen, auf Wärmetauscher sowie Vorratsbehälter für das Thermoöl verzichtet werden, so daß nicht nur die Herstellungskosten, sondern auch die Betriebs¬ kosten der Kalanderwalzwerke insgesamt drastisch gesenkt wer¬ den kann.With the electrical heating elements, the previously used, expensive rotary seals, heat exchangers and storage containers for the thermal oil can be dispensed with, so that not only the production costs but also the operating costs of the calender rolling mills can be drastically reduced overall.
Die Applikation der Heizelemente erfolgt mit Hilfe eines KunststoffSchlauches, der vorzugsweise aus einer Polyorganosi- loxanverbindung besteht und einen gegenüber dem Heizkanal geringeren Querschnitt aufweist. Ein Schlauch aus diesem wei¬ chelastischen Kunststoff kann problemlos in die Heizkanäle eingeführt werden, so daß auch die Nachrüstung von bisher mit Thermoöl beheizten Kalanderwalzwerken möglich ist.The heating elements are applied with the aid of a plastic hose, which preferably consists of a polyorganosiloxane compound and has a smaller cross section than the heating duct. A hose made of this flexible plastic can be inserted into the heating channels without any problems, so that retrofitting of calender rolling mills previously heated with thermal oil is also possible.
Um einen guten Wärmeübergang der elektrischen Heizung mit dem Walzenkörper zu erreichen, wird die äußere Umfangsflache des
Trägerschlauches durch Druckbeaufschlagung gegen die innere Umfangsflache der Heizkanäle gedrückt. Dies kann beispiels¬ weise durch ein Aufvulkanisieren oder Verkleben der Polyorga- nosiloxanverbindung mit der Metalloberfläche erfolgen.In order to achieve a good heat transfer of the electric heater with the roller body, the outer peripheral surface of the Carrier hose pressed against the inner circumferential surface of the heating channels by pressurization. This can be done, for example, by vulcanizing or gluing the polyorganosiloxane compound to the metal surface.
Um den Trägerschlauch gegen die Innenwandung der Heizkanäle mit genügend hoher Kraft zu pressen, wird er z . B. mit einem Druckluft erzeugenden Kompressor verbunden. Genügend hohe Andruckkräfte zum Verkleben der Schlauchoberfläche werden z. B. erreicht, wenn ein Druck von ca. 2,5 bar angewendet wird.In order to press the carrier hose against the inner wall of the heating ducts with sufficient force, it is z. B. connected to a compressor generating compressed air. Sufficiently high pressure forces for gluing the hose surface are e.g. B. achieved when a pressure of approximately 2.5 bar is applied.
Andererseits kann mit Hilfe der Druckbeaufschlagung des Trä¬ gerschlauches auf ein Verkleben oder Aufvulkanisieren auch völlig verzichtet werden, wenn der Trägerschlauch an seinen Enden druckdicht verschlossen werden kann. Durch den erhöhten Innendruck legt sich auch hier der Schlauch wiederum dicht mit hoher Wärmeübertragungskapazität an die Innenfläche der Heiz¬ kanäle an, wobei jedoch etwa bei einem Defekt des Heizdrahtes ein völlig problemloser Austausch des Trägerschlauches möglich ist, wenn der Innendruck auf atmosphärischen Druck abgesenkt wird und sich der Kunststoffschlauch aufgrund seiner elasti¬ schen Eigenschaften infolgedessen auf seinen ursprünglichen Durchmesser zusammenzieht.On the other hand, the application of pressure to the carrier hose means that there is no need for gluing or vulcanization if the ends of the carrier hose can be closed in a pressure-tight manner. As a result of the increased internal pressure, the hose in turn also fits tightly with a high heat transfer capacity on the inner surface of the heating ducts, however, if the heating wire is defective, the carrier hose can be exchanged without any problems if the internal pressure is reduced to atmospheric pressure and As a result, the plastic tube contracts to its original diameter due to its elastic properties.
Beim Arbeiten mit Druckluft sollte jedoch darauf geachtet werden, daß zumindest an einer Seite ein Überdruckventil ein¬ gebaut wird, um bei zu hohen Temperaturen beim Betrieb der Walzen einen unzulässigen Überdruck im Inneren der Heizkanäle bzw. des Trägerschlauches sicher zu verhindern.When working with compressed air, however, care should be taken that an overpressure valve is installed at least on one side, in order to reliably prevent an inadmissible overpressure inside the heating channels or the carrier hose when the rollers are operating at too high temperatures.
Als Druckmedium kann neben Druckluft oder auch ein inertes Gas wie beispielsweise Stickstoff verwendet werden.In addition to compressed air or an inert gas such as nitrogen can be used as the pressure medium.
Als Polyorganosiloxanverbindung zur Herstellung des Träger- Schlauches wird vorzugsweise ein Fluorsilikon oder ein Sili¬ kongummi verwendet. Diese Silikonsorten weisen eine Tempera¬ turbeständigkeit bis ca. 300 °C auf, sind dauerelastisch, alterungsbeständig und chemikalienunempfindlich. Außerdem ist
die Herstellung derartiger Schläuche mit Hilfe eines Extru- dierverfahrens vergleichsweise unproblematisch, wobei die elektrische Heizung bereits bei der Schlauchherstellung in die Schlauchwandung einextrudiert werden kann.A fluorosilicone or a silicone rubber is preferably used as the polyorganosiloxane compound for producing the carrier tube. These types of silicone have a temperature resistance of up to approx. 300 ° C, are permanently elastic, resistant to aging and insensitive to chemicals. Besides, is the production of such hoses with the aid of an extrusion process is comparatively unproblematic, the electrical heating being able to be extruded into the wall of the hose already during hose production.
Um ein Aufblasen des Schlauches zu ermöglichen, ist die elek¬ trische Heizung vorzugsweise als radial nachgiebiger Spiral¬ draht oder radial nachgiebiges Drahtgeflecht ausgebildet, das über einen direkten elektrischen Anschluß oder induktiv be- heizt werden kann. Vorzugsweise weist der Heizdraht eine Iso- lationsbeschichtung auf, so daß sich, beispielsweise bei einer elektrischen Widerstandsheizung, eine verlängerte Heizstrecke ergibt.In order to allow the hose to be inflated, the electrical heater is preferably designed as a radially flexible spiral wire or radially flexible wire mesh, which can be heated via a direct electrical connection or inductively. The heating wire preferably has an insulation coating so that, for example in the case of an electrical resistance heater, there is an extended heating path.
Da die Heizkanäle in den bekannten Kalanderwalzen bisher übli¬ cherweise mit Hilfe von Bohrstangen erzeugt wurden, die die entsprechenden Bohrungen jeweils von den gegenüberliegenden Stirnseiten ausführten, kam es bei dem praktisch nicht zu vermeidenden Verlauf des Bohrers im mittleren Bereich der Walze zu einem Versatz des Bohrloches. Aufgrund des flexiblen Trägerschlauches ist auch in diesem Fall ein problemloses Einführen der Heizung möglich. Sollte bei einem zu großen Versatz das Durchführen des Schlauches nicht mehr möglich sein, können zwei kürzere Heizschläuche von den gegenüberlie- genden Stirnflächen bis zum Bohrlochversatz eingeführt werden.Since the heating channels in the known calender rolls have hitherto usually been produced with the aid of boring bars which each bore the corresponding bores from the opposite end faces, the drill hole in the middle region of the roll, which was practically unavoidable, caused the borehole to be offset . Due to the flexible carrier hose, the heater can also be easily inserted in this case. If it is no longer possible to run the hose if the offset is too large, two shorter heating hoses can be inserted from the opposite end faces to the borehole offset.
Neben dem bereits erwähnten Einextrudieren des elektrischen Heizleiters in die Schlauchwandung kann dieser auch an der Innen- oder Außenseite aufgeklebt oder sonstwie befestigt sein. Es ist vorzugsweise auch möglich, den Trägerschlauch aus einem Innenschlauch kleineren Durchmessers und einem Außen¬ schlauch größeren Durchmessers herzustellen, wobei die elek¬ trische Heizung zwischen beiden Schläuchen angeordnet ist.In addition to the already mentioned extrusion of the electrical heating conductor into the hose wall, it can also be glued to the inside or outside or attached in some other way. It is preferably also possible to produce the carrier hose from an inner hose of smaller diameter and an outer hose of larger diameter, the electrical heater being arranged between the two hoses.
Zwischen beiden Schläuchen kann dann auch ein Kleber vorgese¬ hen sein, so daß ein sehr guter Wärmeübergang gewährleistet ist .
Bei der Ausbildung des Heizleiters als elektrische Wider¬ standsheizung wird dieser vorzugsweise über Schleifringe mit der entsprechenden Stromversorgung kontaktiert. Andererseits ist es jedoch auch möglich, im inneren zentralen Hohlraum der Walze eine Spule vorzusehen, die die elektrische Heizung in¬ duktiv beheizt, wobei bei dieser Beheizungsmethode jedoch auf die elektrostatische Aufladung des Walzmaterials geachtet werden muß.An adhesive can then also be provided between the two hoses, so that very good heat transfer is ensured. When the heating conductor is designed as an electrical resistance heater, it is preferably contacted with the corresponding power supply via slip rings. On the other hand, however, it is also possible to provide a coil in the inner central cavity of the roll, which inductively heats the electrical heating, but this heating method must take care of the electrostatic charging of the rolling material.
Die Temperatursteuerung der Walzenoberfläche ist bei der er¬ findungsgemäßen Kalanderwalze vergleichsweise einfach dadurch möglich, daß am Trägerschlauch Thermofühler bzw. Thermoelemen¬ te vorgesehen sind, deren Schenkel zur Steuerung des Heiz¬ stromes wiederum über Schleifkontakte abgegriffen werden kön- nen.The temperature control of the roll surface is comparatively simple in the calender roll according to the invention in that thermocouples or thermocouples are provided on the carrier hose, the legs of which can in turn be tapped via sliding contacts to control the heating current.
Die Erfindung ist in der Zeichnung beispielsweise veranschau¬ licht und wird im nachfolgenden anhand der Zeichnung im ein¬ zelnen erläutert.The invention is illustrated in the drawing, for example, and is explained in detail below with reference to the drawing.
Die Zeichnungsfigur zeigt einen Schnitt durch den äußeren Mantel 1 einer beheizbaren Kalanderwalze.The drawing figure shows a section through the outer jacket 1 of a heatable calender roll.
In Längsrichtung der Walze befindet sich vergleichsweise nahe unter der Walzenoberfläche 2 ein Heizkanal 3, in den ein Trä¬ gerschlauch 4 eingeführt ist, in dessen Wandung 5 ein spiral¬ förmiger Heizdraht 6 einextrudiert ist.In the longitudinal direction of the roller, a heating duct 3 is located comparatively close below the roller surface 2, into which a carrier hose 4 is inserted, into the wall 5 of which a spiral heating wire 6 is extruded.
An seinem vorderen Ende 7 ist der Trägerschlauch 4 druckdicht verschlossen, während sich sein hinteres Ende 8 in eine Druck¬ hülse 9 erstreckt, durch die Druckluft ins Innere 10 des Trä¬ gerschlauches 4 geleitet werden kann, so daß dieser sich auf¬ bläst und dicht gegen die Innenwandung 11 des Heizkanales 3 anlegt und mit ihr verklebt. Die Druckhülse 9 kann alternativ mit Hilfe eines nicht dargestellten Überdruckventiles druck¬ dicht verschlossen werden, während die Kontaktierung des Heiz¬ drahtes 6 über ebenfalls nicht dargestellte Schleifringe er¬ folgt.
Bezugszeichenliste Mantel Walzenoberfläche Heizkanal Trägerschlauch Wandung Heizdraht vorderes Ende hinteres Ende Druckhülse Inneres Innenwandung
At its front end 7, the carrier tube 4 is closed in a pressure-tight manner, while its rear end 8 extends into a pressure sleeve 9, through which compressed air can be conducted into the interior 10 of the carrier tube 4, so that it inflates and is tight bears against the inner wall 11 of the heating duct 3 and glued to it. The pressure sleeve 9 can alternatively be closed pressure-tight with the aid of a pressure relief valve, not shown, while the heating wire 6 is contacted via slip rings, also not shown. LIST OF REFERENCE NUMERALS jacket roll surface heating duct carrier hose wall heating wire front end rear end pressure sleeve inner inner wall
Claims
1. Beheizbare Kalanderwalze mit mehreren in Längsrichtung des Walzenkörpers verlaufenden Heizkanälen und mit einer oder mehreren im Inneren der Heizkanäle vorgesehenen, die Heiz¬ kanäle (3) durchziehenden, in rotierendem Zustand der Walze mit einer Stromquelle direkt oder induktiv verbind¬ baren Heizungen (6), d a d u r c h g e k e n n ¬ z e i c h n e t, daß die Heizungen (6) an oder in einem schlauchartigen Träger (4) aus weichelastischem Kunst¬ stoff, insbesondere aus einer Polyorganosiloxanverbindung, derart angeordnet sind, daß sie unter radialer Aufweitung zusammen mit dem schlauchartigen Träger (4) an die inneren Umfangsflachen (11) der Heizkanäle anlegbar sind.1. Heated calender roll with a plurality of heating channels running in the longitudinal direction of the roll body and with one or more heating devices (6) provided in the interior of the heating channels, which pass through the heating channels (3) and which can be connected directly or inductively in the rotating state of the roll to a power source. , characterized ¬ characterized in that the heaters (6) on or in a hose-like carrier (4) made of flexible plastic, in particular a polyorganosiloxane compound, are arranged such that they radially expand together with the hose-like carrier (4) to the inner peripheral surfaces (11) of the heating channels can be created.
2. Kalanderwalze nach Anspruch 1, d a d u r c h g e ¬ k e n n z e i c h n e t, daß die äußere Umfangsflache des Trägerschlauches (4) mit der inneren Umfangsflache (11) der Heizkanäle (3) durch Aufvulkanisieren oder Verkleben verbunden ist.2. Calender roll according to claim 1, so that the outer circumferential surface of the carrier tube (4) is connected to the inner circumferential surface (11) of the heating channels (3) by vulcanizing or gluing.
3. Kalanderwalze nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t, daß der Trägerschlauch (4) mit Druckgas, insbesondere Druckluft, beaufschlagbar ist.3. calender roll according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that the carrier hose (4) with compressed gas, in particular compressed air, can be acted upon.
4. Kalanderwalze nach einem der Ansprüche 1 bis 3, d a ¬ d u r c h g e k e n n z e i c h n e t, daß als Poly- organosiloxan ein Fluorsilikon oder ein Silikongummi ver¬ wendet wird.4. A calender roll according to one of claims 1 to 3, that a fluorine silicone or a silicone rubber is used as the polyorganosiloxane.
5. Kalanderwalze nach einem der Ansprüche 1 bis 4, d a ¬ d u r c h g e k e n n z e i c h n e t, daß die elek¬ trische Heizung (6) in Form eines radial nachgiebigen Spiraldrahtes oder Drahtgeflechtes ausgebildet ist, das in die Wandung (5) des Trägerschlauches (4) einextrudiert ist.5. calender roll according to one of claims 1 to 4, d a ¬ d u r c h g e k e n n z e i c h n e t that the electric heater (6) is designed in the form of a radially flexible spiral wire or wire mesh, which is extruded into the wall (5) of the carrier tube (4).
6. Kalanderwalze nach einem der Ansprüche 1 bis 5, d a - d u r c h g e k e n n z e i c h n e t, daß der Heizdraht (6) eine Isolationsbeschichtung aufweist.6. calender roll according to one of claims 1 to 5, since - characterized in that the heating wire (6) has an insulation coating.
7. Kalanderwalze nach einem der Ansprüche 1 bis 6, d a - d u r c h g e k e n n z e i c h n e t, daß zwei sich jeweils etwa bis zur Walzenmitte erstreckende Träger¬ schläuche (4) vorgesehen sind.7. calender roll according to one of claims 1 to 6, d a - d u r c h g e k e n n z e i c h n e t that two each support hoses (4) are provided approximately to the middle of the roll.
8. Kalanderwalze nach einem der Ansprüche 1 bis 7, d a - d u r c h g e k e n n z e i c h n e t, daß der Träger¬ schlauch (4) aus einem Innenschlauch kleineren Durchmes¬ sers und einem Außenschlauch größeren Durchmessers be¬ steht, wobei die elektrische Heizung (6) zwischen Innen- und Außenschlauch angeordnet ist.8. calender roll according to one of claims 1 to 7, since - characterized in that the Träger¬ hose (4) consists of an inner hose smaller diameter and an outer hose larger diameter be¬, the electric heater (6) between the inner and Outer hose is arranged.
9. Kalanderwalze nach Anspruch 8, d a d u r c h g e ¬ k e n n z e i c h n e t, daß die Schläuche miteinander verklebt sind.9. calender roll according to claim 8, d a d u r c h g e ¬ k e n n z e i c h n e t that the hoses are glued together.
10. Kalanderwalze nach einem der Ansprüche 1 bis 9, d a ¬ d u r c h g e k e n n z e i c h n e t, daß die Heizung als Induktionsheizung ausgebildet ist.10. calender roll according to one of claims 1 to 9, d a ¬ d u r c h g e k e n n z e i c h n e t that the heater is designed as an induction heater.
11. Kalanderwalze nach einem der Ansprüche 1 bis 10, d a - d u r c h g e k e n n z e i c h n e t, daß an der Außen¬ seite des Trägerschlauches Thermofühler zur Steuerung des Heizstromes der elektrischen Heizung vorgesehen sind. 11. Calender roll according to one of claims 1 to 10, d a - d u r c h g e k e n n z e i c h n e t that thermal sensors are provided on the outside of the carrier tube for controlling the heating current of the electric heater.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19612324A DE19612324C1 (en) | 1996-03-28 | 1996-03-28 | Non-distorting calendar roller heated efficiently by electric heaters |
| DE19612324 | 1996-03-28 | ||
| PCT/DE1997/000633 WO1997037077A1 (en) | 1996-03-28 | 1997-03-27 | Heated calender roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0889991A1 true EP0889991A1 (en) | 1999-01-13 |
| EP0889991B1 EP0889991B1 (en) | 2000-02-09 |
Family
ID=7789717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97922821A Expired - Lifetime EP0889991B1 (en) | 1996-03-28 | 1997-03-27 | Heated calender roller |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0889991B1 (en) |
| DE (2) | DE19612324C1 (en) |
| WO (1) | WO1997037077A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9907150D0 (en) * | 1999-03-29 | 1999-05-19 | Racster Nicholas | A method of making a body having a temperature controllable outer surface |
| DE102008019720A1 (en) * | 2008-04-18 | 2009-10-22 | Leonhard Kurz Stiftung & Co. Kg | Heated embossing roll |
| IN2013MU02577A (en) * | 2013-08-05 | 2015-06-12 | Marc Ltd T |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3185816A (en) * | 1963-08-30 | 1965-05-25 | Du Pont | Temperature controlled device |
| DE3033689A1 (en) * | 1980-09-08 | 1982-04-22 | Maschinenfabrik Ludwig Rümmer, 8602 Bischberg | Electrically heated roller - has heating mats between inner tube and outer roller mantle tube |
| ATE128499T1 (en) * | 1992-06-22 | 1995-10-15 | Walzen Irle Gmbh | ELECTRICALLY HEATED CALENDAR ROLLER. |
| DE29615219U1 (en) * | 1996-08-31 | 1996-11-14 | Walzen Irle GmbH, 57250 Netphen | Electrically heated calender roll |
-
1996
- 1996-03-28 DE DE19612324A patent/DE19612324C1/en not_active Expired - Fee Related
-
1997
- 1997-03-27 DE DE59701114T patent/DE59701114D1/en not_active Expired - Fee Related
- 1997-03-27 WO PCT/DE1997/000633 patent/WO1997037077A1/en active IP Right Grant
- 1997-03-27 EP EP97922821A patent/EP0889991B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9737077A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0889991B1 (en) | 2000-02-09 |
| WO1997037077A1 (en) | 1997-10-09 |
| DE59701114D1 (en) | 2000-03-16 |
| DE19612324C1 (en) | 1997-06-05 |
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