WO2021259416A1 - Cylindre de chauffage conçu pour une étuve de préchauffage et son utilisation, étuve de préchauffage et installation en étant équipée - Google Patents

Cylindre de chauffage conçu pour une étuve de préchauffage et son utilisation, étuve de préchauffage et installation en étant équipée Download PDF

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Publication number
WO2021259416A1
WO2021259416A1 PCT/DE2021/100498 DE2021100498W WO2021259416A1 WO 2021259416 A1 WO2021259416 A1 WO 2021259416A1 DE 2021100498 W DE2021100498 W DE 2021100498W WO 2021259416 A1 WO2021259416 A1 WO 2021259416A1
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WO
WIPO (PCT)
Prior art keywords
heating
heating roller
insulation layer
spreading
thermal insulation
Prior art date
Application number
PCT/DE2021/100498
Other languages
German (de)
English (en)
Inventor
Michael Brückner
Werner Steinbacher
Christian Stockinger
Original Assignee
Kiefel Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kiefel Gmbh filed Critical Kiefel Gmbh
Publication of WO2021259416A1 publication Critical patent/WO2021259416A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/42—Heating or cooling
    • B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/007—Tempering units for temperature control of moulds or cores, e.g. comprising heat exchangers, controlled valves, temperature-controlled circuits for fluids

Definitions

  • the invention relates to a heating roller for providing a desired surface temperature for tempering a material web rotating around the heating roller with at least one heating mat, a spreading device and a thermal insulation layer, a preheating cabinet with such a heating roller, a system with such a pre-heating cabinet and a method for producing a such a heating roller.
  • Heated rollers are used in a wide variety of processes for pre- and post-treatment of materials that, for example, revolve around these rollers as a material web and are processed, heated or, if necessary, cooled to the roller temperature accordingly at the roller temperature.
  • thermoforming process in the context of plastics processing, for example, the plastic films to be processed must be preheated evenly to a certain temperature (for example 110 ° to 130 ° C) before the actual thermoforming process.
  • This preheating usually takes place in so-called preheating cabinets, as disclosed, for example, in DE 101 51 799 B4.
  • continuously working roller preheaters are used for preheating, which consist of two or four heated rollers, depending on the film thickness and feed speed.
  • the film is guided around the individual rollers in an S-shape with a large angle of wrap and absorbs the required heat from them while the film is being pulled through.
  • DE 30 33 689 discloses an electrically heatable roller, wherein an inner tube and an outer tube arranged coaxially at a distance from the inner tube limit an annular space in which a plurality of butted heating mats are inserted distributed over the circumference.
  • the outer tube forms the roll shell.
  • thermo oils, electrical heating cartridges or heating mats can be used in the heating rollers.
  • Uniform heating of the heating roller along its width and along its circumference is important for homogeneous temperature control of the material web, for example as homogeneous heating of a plastic film as possible for a subsequent thermoforming process, especially for thermoforming processes and the products resulting from them.
  • the use of heating mats already leads to an improved homogeneity of the temperature on the surface of the heating rollers compared to heating the heating rollers by means of Schupat ronen.
  • the thermal contact between the heating mat and the roller material to be tempered can deteriorate due to thermal expansion during operation, so that the heating rollers are damaged in the event of insufficient output of their heating energy to the heating roller surface itself, so that the service life of the heating mats in the heating rollers is limited. It would therefore be desirable to provide heating rollers for preheating cabinets, especially for plastics processing machines, which can be heated as homogeneously as possible and the heating means have a long service life.
  • a heating roller for providing a desired surface temperature for tempering a material web circulating around the heating roller, the heating roller being a circular cylindrical casing tube made of heat-conducting material, preferably metal, and at least one electrical heating mat, which is located on an inside of the casing tube Contact to the jacket tube is arranged, comprises, wherein a heat insulation layer is arranged on an inside of the heating mat not facing the jacket tube and a spreading device is arranged on an inside of the jacket tube on an inside of the heat insulation layer, which exerts a bias on the heat insulation layer on the heating mat, so that an outside of the at least one heating mat facing the jacket pipe is pressed permanently against the inside of the jacket pipe.
  • the term “material web” denotes a flat material, for example provided by a roll, for rotating around the heating roller.
  • the material can be any material that is suitable for revolving around a roll in a manufacturing process.
  • the material is a plastic film, which is provided as a plastic web from a roll wound with the plastic web and which rotates around the heating roller.
  • the plastic film can consist of different plastic materials depending on the process.
  • a heating roller provides a desired surface temperature for controlling the temperature of a material web rotating around the heating roller.
  • it can be heated or cooled by the heating roller.
  • heating roller here refers to the fact that the surface temperature of the heating roller during operation is above the ambient temperature.
  • these can be cooled by the heating roller; in the case of material webs that are cooler than the heating roller, they are heated by the heating roller.
  • the temperature of the material web is controlled by means of heat transfer through contact of the material web with the surface of the heating roller while rotating around the heating roller. A large contact area of the material web with the heating roller enables a more effective heat transfer, so that the material web preferably rests on at least half the surface area of the heating roller.
  • the jacket tube of the heating roller is made of a material that is as thermally conductive as possible, for example metal, preferably steel. Since greater forces are exerted on the heating roller with wider material webs, the material thickness of the jacket tube is adjusted accordingly.
  • Electric heating mats have the advantage over other heating means that they can transfer the generated heat to the heating roller over a large area.
  • the quality of the heat transfer depends on the quality of the mechanical contact between the heating mat (s) and the inside of the jacket pipe.
  • the quality of the thermal contact varies greatly locally, so that on the one hand the surface temperature of the heating roller varies both along the circumference and across its width and, on the other hand, the thermal energy generated everywhere in the heating mat does not can flow evenly to the heating roller, so that strong local overheating of the heating mat (s) can occur, which can lead to damage or even destruction of the heating mat (s).
  • the bias voltage generated by the spreading device is transmitted evenly to the heating mat (s) via the thermal insulation layer, which enables a sufficiently uniform thermal contact of the heating mat (s) over the inside of the jacket tube of the heating roller.
  • the heating roller is heated homogeneously from the inside and a long service life of the heating mat (s) is made possible by avoiding local overheating due to insufficient thermal contact with the Man telrohr.
  • a heating roller for preheating cabinets especially for plastic processing machines, is made available, which can be heated as homogeneously as possible and the heating means has a long service life.
  • the thermal insulation layer completely covers the inside of the heating mat. This ensures, among other things, that the heat from the heating mat does not or only slightly over the side of the heating system facing away from the jacket pipe. roller can flow off, so that the heat generated by the heating mat can be fed to the jacket pipe as homogeneously as possible. If, on the other hand, certain areas of the heating mat were not covered by the thermal insulation layer, the heat flow there could lead to undesirably large temperature inhomogeneities on the outer surface of the heating roller.
  • the thermal insulation layer is permanently connected to the heating mat. This ensures, among other things, that the insulating effect of the thermal insulation layer on the heating mat is as homogeneous as possible for the entire heating mat. In addition, the assembly of the heating roller is also facilitated as a result, since a common part can be installed instead of two independent parts.
  • the thermal insulation layer is vulcanized onto the heating mat with its outside facing the heating mat.
  • the thermal insulation layer is permanently connected to the heating mat in a particularly reliable manner, which leads to a long-lasting, homogeneous insulation effect of the thermal insulation layer on the heating mat.
  • the heat insulation layer is a foam layer, preferably a silicone foam layer.
  • foam layer preferably a silicone foam layer.
  • Such layers can be produced easily and with a flexible shape and provide a good insulating effect.
  • the thermal insulation layer and the heating mat each have a thickness in the radial direction of the jacket tube, the thickness of the thermal insulation layer being at least the thickness of the heating mat, preferably up to a factor of 1.5 thicker than the heating mat, particularly preferably by more than is a factor of 1.5 thicker than the thickness of the heating mat.
  • the heating mat can be 3 mm thick and the thermal insulation layer, for example a silicone foam layer, 5 mm thick.
  • the heat insulation layer can also be 3 mm or 8 mm here.
  • the heating mat has a center along its thickness, with at least some of the heating wires in the heating mat being arranged beyond the center in the direction of the jacket tube. This can improve the heat transfer from the heating mat to the jacket pipe, among other things. All heating wires are preferably laid beyond the middle in the heating mat. The heating wires can form a heating wire layer.
  • the spreading device is shaped like a cylinder, preferably as a round bent sheet metal, and its outer side rests over the entire surface on the thermal insulation layer.
  • one or more depressions are arranged on the outside of the spreading device at least partially circumferentially around the outside in the direction perpendicular to the central axis of the jacket tube. These depressions also stiffen the spreading device, which among other things further even out the contact pressure. Such spreading devices can then be provided with constant egg properties with a greater length.
  • the recesses are preferably circumferential slots or beads in the outside of the spreading device. Grooves are understood to be channel-shaped depressions that serve to adjust thin-walled components, here the spreading device, with respect to deformation or vibration.
  • the spreading device comprises a first spreading device with a spreading effect against the thermal insulation layer in the radial spreading direction and a second spreading device with a spreading effect against the thermal insulation layer in the tangential spreading direction.
  • the first expansion device comprises a radial expansion means, which is arranged only along a single radial expansion direction between the opposing inner sides of the thermal insulation layer through a central axis of the circular-cylindrical jacket tube. Due to the spreading direction along only a single radial spreading direction, the effect of the simultaneously exercised tangential spreading extends over the entire half-shell of the spreading device. As a result, the tangential expansion can be applied homogeneously to the entire area of the expansion device between the radial expansion means and thus to the entire area of the thermal insulation layer.
  • the tangential spreading effect could only be incomplete or possibly not at all in the area on the circumferential spreading device between the first and second radial Spreizele element are exercised, so in the area that, for example, points between two support points differently oriented support elements that are oriented towards each other at an angle in the circumferential direction.
  • very good pressure ratios of the heating mat are achieved on the jacket tube of the heating roller.
  • the radial expansion means comprises one or more support elements which are each arranged parallel to the single radial expansion direction along a heating roller length. In this way, for example, slight unevenness in the jacket pipe can be compensated for.
  • the distance between the ends of the jacket pipe is referred to as the length of the heating roller.
  • the support elements are arranged in the form of tubes with equal distances from one another from one end face of the casing tube to the other end face of the casing tube. This enables the radial expansion effect to be made more uniform over the length of the heating roller.
  • the first expansion means is designed to be adjustable in length in the radial direction. Among other things, this facilitates the installation of the spreading device in the heating roller and enables an individual local adjustment of the radial spreading effect.
  • the second spreading device comprises a tangential spreading means, via which the spreading device rests on the inside of the thermal insulation layer in order to spread it in the tangential spreading direction.
  • the expansion means makes it possible to set a tangential expansion effect in such a way that the most homogeneous pressure possible is exerted on the heating mat.
  • the tangential expansion means comprises two opposing support elements, preferably angle profiles, which are connected to one another with one or more mutually variable distance connections, with the adjustment of which the opposing support elements can be moved towards or away from each other in the tangential expansion direction.
  • the tangential spreading effect can be set precisely and very finely.
  • such a second spreading device is easy to handle.
  • the spreading device is designed so that the radial and tangential spreading effects can be set independently of one another. This is possible with the first and second spreading devices described above.
  • electrical connections of the at least one electrical heating mat between the tangential expansion means for the electrical supply of the heating mat out of the heat insulation layer or through it into guided an inner region of the jacket tube From here the electrical connections can, for example, be led out via the first spreading device to the axis of the jacket tube and out of it.
  • the tangential expansion means offers a gap in the circumferential expansion device towards the inner volume of the jacket tube, which gap can be used for guiding the electrical connections.
  • electrical connections of the heating mat are then continued through the Sp Drostvorrich device in the direction of a power supplier of the heating mat.
  • two heating mats are arranged inside the jacket tube each Weil in the form of half cylinders on the inside of the jacket tube. Among other things, this makes it easy to assemble the heating mats and still cover the entire inner surface of the jacket pipe for the most homogeneous possible heating.
  • the jacket tube comprises at least one deep hole parallel to the outside of the jacket tube, in which one or more temperature sensors for determining a surface temperature are arranged on the outside of the jacket tube.
  • the surface temperature of the jacket pipe can be precisely determined and the heating power of the heating mat (s) can be controlled accordingly so that the desired surface temperature is reached or maintained. If there are several temperature sensors, it can be measured directly whether there is sufficient homogeneity of the surface temperature along the width of the heating roller.
  • a plurality of deep bores can also be provided at various points in the casing tube.
  • only a single temperature sensor is arranged in the depth bore in the middle between the two end faces of the casing tube.
  • the various configurations of the spreading device make it possible to achieve a homogeneity of the surface temperature, so that only a single temperature sensor is required to control the surface temperature.
  • the surface temperature of the outside of the casing tube varies by less than 5 ° C. over the surface.
  • the invention further relates to a preheating cabinet for tempering a material web passed through the preheating cabinet, comprising at least one heating roller according to the invention.
  • the material web is guided into the preheating cabinet via an entrance and then out of the preheating cabinet via an exit.
  • the input and output of the preheater can be arranged on different sides, preferably opposite sides, of the preheater or on the same side of the preheater.
  • the material web is heated to a temperature of 60-140 ° C. in the preheating cabinet with the at least one heating roller.
  • the heating mat (s) of the heating roller (s) can, for example, be operated with 400V and have a heating power of 12000 W.
  • At least two of the heating rollers according to the invention are arranged in the preheating cabinet, with at least one first in front of the heating rollers
  • Transport roller for feeding the material web to the heating rollers and after the heating rollers at least one second transport roller for discharging the material web from the preheating cabinet are arranged, preferably the heating rollers and transport rollers are arranged in the preheating cabinet so that the material web S-shaped around the heating and transport rollers can be guided around.
  • the term "feeding the material web to the heating rollers" refers to the feeding of the material web to the first heating roller, via which the material web is then fed to the second heating roller.
  • the first transport roller therefore also indirectly feeds the material web to the second heating roller.
  • a preheating cabinet especially for plastics processing machines, is made available in which the heating rollers can be heated as homogeneously as possible and the heating means have a long service life.
  • the invention further relates to a system with a machine for material processing comprising a preheating cabinet according to the invention for tempering a material web for subsequent processing of the material web in the machine.
  • the machine can then include one or more components for processing and further processing of the material web or the products made from the material web after the preheating cabinet.
  • the material web comprises a composite material.
  • the material web can also consist entirely of the composite material.
  • the material web is a plastic film.
  • the machine is a thermoforming machine.
  • thermoforming machine thermoplastics can be formed under the action of heat and with the help of compressed air and / or vacuum. Foils, usually with a smaller thickness, or plates, usually with a greater thickness, can be used as material webs.
  • a system in particular with a plastics processing machine, which includes a preheating cabinet in which the heating rollers for preheating the material web to be processed can be heated as homogeneously as possible and the heating means have a long service life.
  • the invention also relates to a method for producing a heating roller according to the invention for providing a desired surface temperature for tempering a material web rotating around the heating roller, comprising the steps:
  • the steps of arranging the heating mat and the thermal insulation layer are carried out together, since the thermal insulation layer is permanently connected to the heating mat.
  • This permanent bond can be carried out, for example, by means of vulcanization.
  • the step of exerting a pretensioning comprises the steps of exerting a spreading effect against the thermal insulation layer in the radial direction
  • Fig.l heating roller according to the invention (a) in a perspective external view and (b) in a lateral section;
  • heating roller 1 shows a heating roller 1 according to the invention (a) in a perspective external view and (b) in a lateral section to provide a desired surface temperature for tempering a material web 20 rotating around the heating roller 1,
  • the heating roller 1 being a circular-cylindrical jacket tube 2 made of heat-conducting material, preferably metal, and comprises at least one electrical heating mat 3, which is arranged on an inner side 21 of the jacket tube 2 in contact with the jacket tube 2.
  • a thermal insulation layer 4 is arranged on the inside 31 of the heating mat 3 facing the jacket tube 2.
  • a spreading device 5 is arranged on an inside 41 of the heat insulation layer 4, which exerts a pretension via the heat insulation layer 4 on the heating mat 3 so that an outer side 32 of the at least one heating mat 3 facing the jacket tube 2 is permanently against the Inside side 21 of the jacket tube 2 is pressed.
  • the surfaces or sides that face the central axis MA of the jacket tube 2 are referred to here as inner sides 21, 31, 41, respectively.
  • the surfaces or sides that face the outer surface 22 of the Man telrohres 2 are referred to here as outer sides 22, 32, 42, 5a.
  • the spreading device 5 is cylindrical in shape, preferably as a rounded sheet metal, and its outer side 5a rests on the thermal insulation layer 4 over its entire surface.
  • the spreading device 5 comprises a first spreading device 51 with a spreading effect against the thermal insulation layer 4 in the radial spreading direction RS and a second spreading device 52 with a spreading effect against the thermal insulation layer 4 in the tangential spreading direction TS.
  • FIGS. 2 and 3 for further details of the second spreading device 52.
  • FIG. 6 for further details on the structure of the heating mat 3.
  • the surface temperature of the outside 22 of the jacket tube 2 varies over the surface by less than 5 ° C.
  • the jacket tube 2 here additionally comprises a single deep bore 23 parallel to the outside 22 of the jacket tube 2, in which one or more temperature sensors 6 can be arranged to determine a surface temperature on the outside 22 of the jacket tube 2, in this Embodiment, however, only a single temperature sensor 6 in the middle between tween the two end faces 12a, 12b of the jacket tube 2.
  • the first spreading device 51 here comprises a radial spreading means 51a, which only extends along a single radial spreading direction RS between the opposite inner sides 41 of the thermal insulation layer 4 through the central axis MA of the circular cylindrical man- telrohres 2 is arranged therethrough.
  • the radial expansion means 51a here comprises four support elements, which are each arranged parallel to the single radial expansion direction RS along a heating roller length 11, the support elements 51a in the form of tubes with equal distances from one another from one end face 12a of the jacket tube 2 to its end face 12b of the Jacket tube 2 are arranged in order to distribute the radial spreading effect evenly over the heating roller length 11.
  • the first expansion means 51a is designed to be adjustable in length in the radial direction (length-adjustable tubes 51a).
  • the spreading device 5 is designed so that the radial and tangential spreading effects can be set independently of one another.
  • electrical connections 33 of the at least one electrical heating mat 3 are continued between the tangential expansion means 52b for the electrical supply of the heating mat 3 out of the thermal insulation layer 4 or through it into an inner region of the jacket tube 2 and in the direction of a power supplier 34 of the heating mat 3 .
  • Fig.2 shows an embodiment of the spreading device 5 of a heating roller 1 according to the invention (a) in a lateral section and (b) in an enlargement of the second Spreizeinrich device 52.
  • the second spreader 52 is formed here as a curved sheet, the full surface with its outside 5a the thermal insulation layer 4 is to rest, here in the form of two half-shells as heating mats 3a, 3b with respective thermal insulation layers 4, and comprises a tangential expansion means 52b to expand them in the tangential expansion direction TS.
  • the tangential expansion means 52b here comprises two opposing support elements 52c, preferably angular profiles, which are connected to one another with one or more mutual variable-distance connections 52d, with the adjustment of which the opposing support elements 52c can be moved towards or away from each other in the tangential expansion direction TS.
  • the Wei direct three recesses 53 are arranged on the outside 5a of the spreader 5 largely circumferentially around the outside 5a in alignment perpendicular to the central axis MA of the one telrohres 2, for more details see FIG. 3 shows an embodiment of the spreading device 5 with depressions 53 on the outside 5a in a perspective view, as it can be inserted into a heating roller 1 with heating mats 3a, 3b already arranged therein.
  • depressions 53 are arranged on the outside 5a of the spreader 5 as three depressions 53 for the most part umlau fend around the outside 5a in alignment perpendicular to the central axis MA of the Mantelroh res 2.
  • the depressions 53 are made here as parallel slots or beads in the outside 5a of the spreading device 5, for example embossed or made with a cutting or punching tool.
  • the depressions 53 here do not run over the tangential expansion means 52b on the outside 5a, but rather end on both sides shortly before reaching the tangential expansion means 52b. This “gap” in the depressions 53 can be present symmetrically on the opposite side of the cylindrical second spreading device 52.
  • the spreading device 5 is shaped here as a round, bent sheet metal which is intended to rest with its outer side 5a over the entire surface of the thermal insulation layer 4.
  • FIG 4 shows an embodiment of a preheating cabinet 10 according to the invention for tempering a material web 20 guided through the preheating cabinet 10 comprising two heating rollers 1 according to the invention, with a first transport roller 30a in front of the heating rollers 1 for feeding the material web 20 to the first of the two heating rollers 1 and after the two heating rollers 1, a second transport roller 30b for diverting the material web 20 from the preheating cabinet 10 are arranged.
  • the heating rollers 1 and transport rollers 30a, 30b are arranged in the preheating cabinet 10 such that the material web 20 is guided in an S-shape around the heating and transport rollers 1, 30a, 30b.
  • the material web 20 (not explicitly shown) runs from an inlet 40 of the preheating cabinet 10 downwards around the first transport roller 30a and further in an S-shape to the first of the two heating rollers 1 and around this and further down to the second of the two Heating rollers 1 and around them and further in S-shape to the second transport roller 30b and around it further to the outlet of the preheating cabinet 10, where the preheated material web 20 emerges from the preheating cabinet 10.
  • the material web 20 can be heated in the preheating cabinet 10 with the two heating rollers 1 to a temperature of 60-140 ° C. The exact temperature is set depending on the machining process and material of the material web 20 to the respective ge desired preheating temperature.
  • FIG 5 shows an embodiment of a system 100 according to the invention with a Ma machine 110 for material processing comprising a preheating cabinet 10 according to the invention (see also FIG at the end after passing through further components 110a (for example a forming station and / or a cutting station and / or a stacking station etc.) products 120 can output from the processed material web 20.
  • These products 120 can represent end products for delivery to the customer or intermediate products for further processing or processing.
  • the material web 20 can comprise a composite material or consist entirely of a composite material.
  • the material web 20 is a plastic film.
  • the material web 20 can be fed to the machine 110 as a running material from a roll or piece by piece, for example in the form of plates.
  • the machine 110 is, for example, a thermoforming machine.
  • FIG. 6 shows an embodiment of the heating roller 1 according to the invention in a lateral section through the wall of the heating roller 1, an electrical heating mat 3 being arranged on an inner side 21 of the jacket tube 2 in contact with the jacket tube 2.
  • a thermal insulation layer 4 is in turn arranged on the inside 31 of the heating mat 3 not facing the jacket tube 2.
  • a spreading device 5 is then arranged on an inner side 41 of the thermal insulation layer 4. This spreading device 5 is intended to exert a pre-tension on the heating mat 3 via the thermal insulation layer 4 in such a way that the outer side 32 of the heating mat 3 facing the jacket tube 2 is permanently and as homogeneously as possible against the inside 21 of the jacket tube 2 is pressed.
  • the thermal insulation layer 4 completely covers the inside 31 of the heating mat 3.
  • the heat insulation layer 4 can be permanently connected to the heating mat 3.
  • the heat meisolations Mrs 4 is vulcanized to the heating mat 3 with its outer side 42 facing the heating mat 3.
  • the thermal insulation layer 4 can be designed as a foam layer, preferably as a silicone foam layer. Such layers provide good thermal insulation from the inside 41. It is therefore irrelevant for the thermal insulation which material the spreading device 5 is made of.
  • the thermal insulation layer 4 and the heating mat 3 each have a thickness 3d, 4d in the radial direction of the Man telrohres 2, the thickness 4d of the thermal insulation layer 4 can be at least the thickness 3d of the heating mat 3, preferably up to a factor of 1.5 thicker than that Heating mat 3 can be, particularly preferably more than a factor of 1.5 thicker than the thickness 3d of the heating mat 3 can be.
  • the heating mat 3 has a center 3m along its thickness 3d, with all the heating wires 35 (shown here as a layer for the sake of simplicity) of the heating mat 3 beyond the center 3m in the direction of the casing tube 2, which contributes to improving the heat transfer to the casing tube 2 .
  • the layer structure of the heating mat 3 can be designed as follows: a cover layer 36 is arranged towards the thermal insulation layer 4, underneath a silicone layer 37, the heating wires here in the form of a heating wire layer 35 and again a cover layer 36 towards the inside 21 of the jacket tube 2.
  • the electrical connections 33 of the heating mat 3 lead from the heating mat 3, for example, between the tangential expansion means 52b for the electrical supply of the heating mat 3 from the thermal insulation layer 4 or through it into an interior of the jacket tube 2 and from the heating roller 1, for example via the Axle suspension out.
  • FIG. 7 shows an embodiment of a method 200 according to the invention for producing the heating roller 1 according to the invention for providing a desired surface temperature for controlling the temperature of a material web 20 rotating around the heating roller 1, comprising the steps of arranging 210 at least one heating mat 3 on a Inner side 21 of a circular cylindrical jacket tube 2 of the heating roller 1 in contact with the jacket tube 2 and the arrangement 220 of a heat insulation layer 4 on an inside 31 of the heating mat 3 that is not facing the jacket tube 2 be arranged on the jacket pipe.
  • the method further comprises the steps of arranging 230 a spreading device 5 inside the casing tube 2 on an inside 41 of the thermal insulation layer 4 and of exerting 240 a prestress over the thermal insulation layer 4 on the heating mat 3 by means of the spreading device 5, so that the casing tube 2 facing outer side 32 of the at least one heating mat 3 is pressed permanently against the inner side 21 of the jacket tube 2.
  • the steps of arranging 210, 220 the heating mat 3 and the heat insulation layer 4 can be carried out together, in that the heat insulation layer 4 is permanently connected to the heating mat 3, preferably by means of vulcanization.
  • the step of exerting 240 a pretension can include the steps of exerting 242 a spreading effect against the thermal insulation layer 4 in the radial spreading direction RS by means of a first spreading device 51 of the spreading device 5 and of exerting 244 a spreading effect against the thermal insulation layer 4 in the tangential spreading direction TS by means of a second Spreading device 52 of the spreading device 5 include.
  • the radial and tangential spreading effects can either be set one after the other or simultaneously or alternately piece by piece in an iterative process until the desired spreading effect of the spreading device 5 is set or the heating mat 3 rests homogeneously on the inside 21 of the jacket tube 2 over the entire surface.
  • radial expansion means e.g. one or more support elements
  • thermoforming machine for example a thermoforming machine

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

L'invention concerne un cylindre de chauffage (1) conçu pour fournir une température de surface souhaitée pour thermoréguler une bande de matériau (20) tournant autour du cylindre de chauffage, une étuve de préchauffage (10) équipée d'un tel cylindre de chauffage, une installation (100) comportant une telle étuve de préchauffage ainsi qu'un procédé (200) pour produire un tel cylindre de chauffage qui comprend un tuyau extérieur (2) cylindrique constitué d'un matériau thermoconducteur, de préférence d'un métal, et au moins une nappe chauffante (3) électrique qui est agencée sur une face interne (21) du tuyau extérieur de manière à être en contact avec ce tuyau extérieur, une couche thermo-isolante (4) étant disposée sur une face interne (31) de la nappe chauffante qui n'est pas orientée vers le tuyau extérieur, un dispositif d'écartement (5) étant en outre disposé à l'intérieur du tuyau extérieur sur une face interne (41) de la couche thermo-isolante et exerçant une précontrainte sur la couche thermo-isolante sur la nappe chauffante de manière qu'une face externe (32) de ladite nappe chauffante orientée vers le tuyau extérieur soit pressée de manière permanente contre la face interne du tuyau extérieur.
PCT/DE2021/100498 2020-06-25 2021-06-10 Cylindre de chauffage conçu pour une étuve de préchauffage et son utilisation, étuve de préchauffage et installation en étant équipée WO2021259416A1 (fr)

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DE102020116749.0A DE102020116749B3 (de) 2020-06-25 2020-06-25 Heizwalze für einen Vorwärmschrank und deren Herstellung, Vorwärmschrank sowie diesen umfassende Anlage
DE102020116749.0 2020-06-26

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WO2021259416A1 true WO2021259416A1 (fr) 2021-12-30

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3033689A1 (de) 1980-09-08 1982-04-22 Maschinenfabrik Ludwig Rümmer, 8602 Bischberg Elektrisch beheizbare walze
DE19961365A1 (de) * 1999-12-17 2001-06-21 Esselte Nv Laminierwalze für Laminierpressen sowie Verfahren zur Herstellung von Laminierwalzen
EP2570549A1 (fr) * 2011-09-13 2013-03-20 Quantum Technologie GmbH Rouleau pour chauffer une bande de papier ou de tissu
DE202014103596U1 (de) * 2014-08-01 2014-08-19 Robert Bürkle GmbH Beheizbare Walze
DE102015005066A1 (de) 2015-04-21 2016-10-27 Illig Maschinenbau Gmbh & Co. Kg Verfahren zum Bewegen einer Bahn von thermoplastischer Kunststofffolie durch eine Vorheizung zum Erwärmen einer Bahn von thermoplastischer Kunststofffolie und Vorheizung zur Durchführung des Verfahrens
CN207003053U (zh) * 2017-07-26 2018-02-13 区其安 一种纺织压光机的钢热辊
DE10151799B4 (de) 2001-10-19 2018-11-08 Gabler Maschinenbau Gmbh Heizeinrichtung zum Vorwärmen von thermoplastischer Kunststoffolie
DE102017005531A1 (de) * 2017-06-10 2018-12-27 Illig Maschinenbau Gmbh & Co. Kg Heizeinrichtung für eine Thermoformmaschine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3033689A1 (de) 1980-09-08 1982-04-22 Maschinenfabrik Ludwig Rümmer, 8602 Bischberg Elektrisch beheizbare walze
DE19961365A1 (de) * 1999-12-17 2001-06-21 Esselte Nv Laminierwalze für Laminierpressen sowie Verfahren zur Herstellung von Laminierwalzen
DE10151799B4 (de) 2001-10-19 2018-11-08 Gabler Maschinenbau Gmbh Heizeinrichtung zum Vorwärmen von thermoplastischer Kunststoffolie
EP2570549A1 (fr) * 2011-09-13 2013-03-20 Quantum Technologie GmbH Rouleau pour chauffer une bande de papier ou de tissu
DE202014103596U1 (de) * 2014-08-01 2014-08-19 Robert Bürkle GmbH Beheizbare Walze
DE102015005066A1 (de) 2015-04-21 2016-10-27 Illig Maschinenbau Gmbh & Co. Kg Verfahren zum Bewegen einer Bahn von thermoplastischer Kunststofffolie durch eine Vorheizung zum Erwärmen einer Bahn von thermoplastischer Kunststofffolie und Vorheizung zur Durchführung des Verfahrens
DE102017005531A1 (de) * 2017-06-10 2018-12-27 Illig Maschinenbau Gmbh & Co. Kg Heizeinrichtung für eine Thermoformmaschine
CN207003053U (zh) * 2017-07-26 2018-02-13 区其安 一种纺织压光机的钢热辊

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