Roller with heating device, printing, embossing and / or rolling mill with such a roller and method for converting a heating device of a roller

Abstract

The invention relates to a roller for a rolling mill, embossing mill and / or printing mill, comprising at least one heating device for heating the outer surface of the roller, wherein the heating device comprises at least one channel arranged inside the roller, wherein at least one electrical heating element is arranged inside the channel, and in at least one space between an outer surface of the heating element and an inner wall of the channel at least one, at least partially fluidal and / or castable heat-conducting element is arranged; a printing, embossing and / or rolling mill, in particular for the production of elements of an electrical storage device, and a method for converting a heating device of a roller.

Description

[0001] The present invention relates to a roller with a heating device, in particular a roller for a rolling mill, embossing mill and / or printing mill, comprising at least one heating device for heating the shell surface of the roller, wherein the heating device comprises at least one channel arranged inside the roller, as well as a printing, embossing and / or rolling mill with such a roller and a method for converting a heating device of a roller.

[0002] Rollers, especially anilox rollers, and printing, embossing or rolling mills, especially anilox and / or flexographic printing units, with rollers are increasingly used, particularly in the manufacturing processes of electrical storage devices such as batteries, accumulators, capacitors, electrolyzers and the like.

[0003] These printing, rolling, and embossing machines enable continuous processing compared to sequential or serial processing of individual components. This increases throughput and production speed. Processing speeds of 300 m / min and more are desired. Components of the electrical storage system, which can be manufactured from windable substrate materials such as films, are processed using these rolling machines, in particular coated, cured, and / or formed.

[0004] For many processing steps, it is advantageous, if not necessary, to heat the rollers. For example, rolling mills or multi-roll systems are known in the prior art where the rollers are usually heated with a fluid, particularly oil, to achieve the necessary ambient conditions for processing the substrate material, such as an operating temperature for film production. Such fluid heating systems result in considerable effort in terms of handling, connection, maintenance, and roller replacement. Furthermore, the maximum roller temperature is limited by the oil used, specifically to a maximum temperature of 300°C to 360°C.

[0005] It is also known to temperature-control rollers using an electric system. These offer the advantage of generating higher temperatures of up to 750°C on the surface or outer layer of the roller. Multiple heating elements can also be controlled separately, allowing for the setting and regulation of desired heating profiles along the roller's length. This is also possible with multi-part heating elements that have several heating zones or segments which can be operated or controlled separately. Such heating profiles are not possible in fluidically heated rollers due to the uniform temperature of the fluid.

[0006] However, to achieve high operating temperatures with such rollers, which incorporate electric heating elements—especially temperatures higher than those achievable with fluid heating devices—extremely high demands must be placed on the manufacturing precision of both the heating elements and the channels within the roller that house them. A press fit with extremely tight tolerances must be achieved. This is because any gap between the outer wall of the heating element and the inner wall of the channel leads to the entrapment of air, which acts as insulation. In these areas, heat transfer from the heating element to the roller is impeded. This can lead to local overheating and overloading of the heating element, resulting in failures and defects. Furthermore, this creates hot spots and cold spots on the roller's surface, leading to inconsistent processing of the substrate material fed to the roller.

[0007] Due to the higher operating temperatures possible with electric heating, it is often desirable to convert existing fluidically heated rollers to electric heating.

[0008] Due to the necessary precise adaptation of the existing channel geometry to the geometry of the electric heating elements, a very complex reworking of the entire roller is required. Such subsequent modification (e.g., enlarging the existing bores) of the fluidically heated rollers for the installation of an electric heater, however, significantly affects the roller's properties, particularly with regard to concentricity, balance, and the associated running characteristics. Without further extensive reworking of the roller, this would lead to a loss of the existing precision, for example, to undesirable roller vibrations.

[0009] Furthermore, retrofitting a heating cartridge into a central bore of a roller is insufficient. While such an arrangement of electric heating elements reduces post-processing, it does not adequately heat the roller surface to the desired temperatures. The heating power of electric heating elements or cartridges is simply too low. Moreover, due to the inertia of the heating process caused by the mass of the roller material, precise temperature control of the roller surface within the necessary narrow temperature ranges is impossible. This results in significant temperature fluctuations on the surface.

[0010] Fluid-heated rollers are therefore currently only used in systems where oil temperature control is provided.

[0011] Furthermore, due to the specific requirements for tightly sealed fluid channels for the heating fluid, such as oil, electrically temperature-controlled rolls can only be used in rolling mills designed for electrical temperature control. Therefore, transferring or converting the rolls from one rolling mill to another is currently not possible.

[0012] It is therefore an object of the present invention to provide a roller that enables the heating of the roller surface to the temperatures necessary for processing substrate materials for the production of electrical storage elements, while simultaneously being fail-safe. Furthermore, it should make it possible to convert existing fluid-heated rollers to electrical heating without having to carry out a fundamental redesign of the roller, in particular to ensure synchronous rotation of the roller.

[0013] This problem is solved by a roller for a rolling mill, embossing mill and / or printing mill, comprising at least one heating device for heating the shell surface of the roller, wherein the heating device comprises at least one channel arranged inside the roller, wherein at least one electrical heating element is arranged inside the channel, and in at least one space between an outer surface of the heating element and an inner wall of the channel at least one, preferably at least partially fluidal and / or castable, heat-conducting element is arranged.

[0014] It is proposed that the channel be designed as a fluid channel, wherein the fluid channel is suitable for being flowed through by at least one heating fluid, in particular before the heating element is arranged in the fluid channel or after the heating element has been removed from the fluid channel.

[0015] It is preferred that the heating fluid comprises oil, water and / or a glycol-containing liquid.

[0016] It is also proposed that the heat-conducting element, optionally furthermore, comprises at least a clamping element, in particular a conical clamping element, which can be brought into contact, at least partially, with the outer surface of the heating element and the inner surface of the channel, in particular mechanical and / or thermal contact, and / or forms the heat-conducting element.

[0017] It is preferred that the thickness of the clamping element is variable and / or adjustable along a normal direction of the surface of the heating element and / or a normal direction of the inner surface of the channel.

[0018] In the two aforementioned embodiments, it is preferred that the clamping element comprises at least a metallic material, optionally aluminium, copper, magnesium, brass, bronze, silver, gold, and / or tungsten, at least in some areas.

[0019] It is also proposed that the heat-conducting element, which is at least partially fluid and / or castable, comprises at least a filling material, optionally containing graphite, arranged at least partially in the space between the elements.

[0020] The roller can be characterized in that the graphite content in the filling material is more than 40%, preferably more than 50%, more preferably more than 60%, even more preferably more than 70%, even more preferably more than 80%, and most preferably more than 90%.

[0021] It may also be provided that the filling material is at least partially powdery, at least partially pasty, and / or at least partially highly viscous.

[0022] Furthermore, it is proposed that the heating element has at least two, preferably a plurality of, heating zones, wherein the heating zones are arranged along a longitudinal direction of the channel and / or heating element and / or the heating zones are arranged in a circular direction of the channel and / or the heating element and / or the heating zones have different first characteristics, in particular different heating powers and / or different heating times.

[0023] It is also preferred that at least two, preferably a plurality of, heating elements are present, wherein the heating elements have different second characteristics, in particular different heating powers and / or different heating times.

[0024] Furthermore, a roller can be characterized by at least one sensor, in particular a temperature sensor, which is inserted at least partially into the channel and / or is in operative contact with the channel.

[0025] Finally, it is preferred that the roller be usable in a printing unit, embossing unit and / or rolling mill for the production of elements of an electrical storage device, such as a battery, accumulator, capacitor, electrolyzer and / or fuel cell.

[0026] Furthermore, we supplied a printing, embossing and / or rolling mill, in particular for the production of elements of an electrical storage device, such as a battery, accumulator, capacitor, electrolyzer and / or fuel cell, comprising at least one roller according to the invention and / or previously described.

[0027] A method for converting a heating device of a roller is also proposed, the method comprising the provision of a roller comprising at least one fluid channel suitable for flow through by means of at least one heating fluid, Arrangement of at least one electrical heating element in the fluid channel, and arrangement of at least one, preferably at least partially fluidal and / or castable, heat conducting element in at least one space between an outer surface of the heating element and an inner wall of the channel.

[0028] The method can be characterized in that at least one wiring of the heating element is arranged in at least one central channel, at least one inlet channel, in particular the fluid channel, at least one outlet channel, in particular the fluid channel, and / or at least one connecting opening, in particular of the central channel, the inlet channel and / or the outlet channel.

[0029] Finally, it is preferred that the arrangement of the wiring includes the prior smoothing and / or rounding of acute-angled edges present in the fluid channel, the drain channel, the connecting opening, the central channel and / or the inlet channel, optionally using at least one mechanical deburrer, optionally comprising at least one pipe deburrer and / or at least one conical milling cutter.

[0030] The invention is thus based on the surprising finding that an electric heating device for a roller can be designed in such a way that the surface of the roller can be heated to temperatures of up to 750°C by arranging a heat-conducting element between the electric heating element and the inner wall of a channel accommodating the electric heating element. The heat-conducting element is preferably at least partially fluidic and / or castable, but this is not a requirement.

[0031] For example, a heat-conducting element can also be an element whose thickness adapts, particularly mechanically, to a distance of the heating element from the inner wall when the heating element is inserted into the channel, such as a clamping element, in particular a conical clamping element.

[0032] Alternatively or additionally, the heat-conducting element, particularly a fluid and / or castable one, can include a filler material, optionally in powder and / or paste form. This offers the advantage that virtually any unevenness on the surface of the heating element and / or the inner surface of the channel can be compensated for, i.e., variations in the distance between the surface and the inner surface can be balanced without creating air pockets that would have an insulating effect or impair or prevent heat transfer from the heating element to the roller. Furthermore, a filler material allows the use of materials with high thermal conductivity.

[0033] Graphite, for example, is a cost-effective and efficient material with a thermal conductivity of 140. Wm*K exhibits.

[0034] Furthermore, the use of such a heat-conducting element enables a cost-effective and straightforward conversion of a fluidically heated roller to an electrically heated roller. Existing fluidically heated rollers, particularly oil-heated ones, have peripheral bores or channels, especially fluid channels, located outside the central axis of rotation, just below the roller's outer surface. These bores are filled with the heated fluid, especially oil, to heat the roller.

[0035] The invention described here now allows for the conversion of such fluidically heated rollers to electric heating. In particular, no modifications to the roller are necessary that would prevent renewed fluidic heating. Thus, a return to fluidic heating is also possible.

[0036] In particular, the use of the heat-conducting element eliminates the need for geometric changes to the roller, such as widening the fluid channels or adding channels, which would lead to warping of the roller or imbalances and thus a loss of precision.

[0037] For conversion, electric heating elements are inserted into the peripheral (fluid) channels, and any existing gap between the inner wall of the respective channel and the heating element is compensated for by the heat-conducting element, or by displacing the air in this area. This can be done from one side of the roller, but also, for example in the case of very large bale widths (i.e., long-range extensions), from both sides relative to the roller's axis of rotation. This also makes it possible to work with two or more heating elements per channel. In this case, at least one heating element is inserted from opposite sides relative to the roller's axis of rotation. These can then be controlled separately.

[0038] The heating elements themselves can have a homogeneous temperature distribution. However, it is also possible to use heating elements with different heating zones. This allows for a customized temperature distribution on the bale surface or the roller's outer surface, compensating for any temperature fluctuations caused by the roller body.

[0039] Additionally, thermocouples can be used in the existing channels to monitor the temperature near the bale surface of the roller.

[0040] Further features and advantages of the invention will become apparent from the following description, in which preferred embodiments are explained with reference to the accompanying figures.

[0041] This shows Fig. 1 a schematic cross-sectional view of an embodiment of a fluid-heated roller; Fig. 2a a schematic cross-sectional view of another embodiment of a fluid-heated roller; Fig. 2b a schematic cross-sectional view of an alternative embodiment of a fluid-heated roller; Fig. 3 a schematic cross-sectional view of a first embodiment of a roller according to the invention based on the roller according to Fig. 1 using a filler material as a heat-conducting element; Fig. 4a a schematic cross-sectional view of a second embodiment of a roller according to the invention based on the roller according to Fig. 1 using a filler material as a heat-conducting element; Fig. 4b a schematic cross-sectional view of the roller of the Fig. 4a with partially shown cabling; Fig. 5 a schematic cross-sectional view of a third embodiment of a roller according to the invention based on the roller according to Fig. 1 using a filler material as a heat-conducting element; Fig. 6 a schematic cross-sectional view of a third embodiment of a roller according to the invention based on the roller according to Fig. 1 using a clamping element as a heat-conducting element; Fig. 7a a detailed view of section A of the roller of the Fig. 6 omitting the clamping element; and Fig. 7b a detailed view of section A of the roller of the Fig. 6 showing the clamping element.

[0042] In Fig. Figure 1 shows a first embodiment of a roller 1. The roller 1 is rotatable about an axis of rotation 3 and comprises a cylindrical surface 5. Channels 7 are arranged in the region of the cylindrical surface 5. These channels 7 can be filled with a fluid, such as oil, to heat the cylindrical surface 5. Several channels 7, for example 18 channels, are distributed around the circumference of the roller about the axis of rotation 3, wherein in Fig. 1 only two channels 7 are shown.

[0043] Channels 7 are supplied with fluid via a central channel 9, with a connection between channels 7 and the central channel 9 provided by inlet channels 11 and outlet channels 12. The inlet channels 11 open into the central channel 9 via connecting openings 13. As shown in the Fig. As indicated in Figure 1, several connecting openings 13 are distributed around the circumference of the central channel 9 around the axis of rotation 3, each of which leads into inlet channels not shown, through which fluid can be supplied to the previously described additional channels, which are distributed around the circumference of the roller 1 in addition to the channels 7, for heating the outer surface 5.

[0044] The fluid is fed to the roller 1 via an inlet 15 located in the region of the axis of rotation 3 and discharged via an outlet 17, also located in the region of the axis of rotation 3. After passing through the central channel 9, the inlet channels 11, the channels 7, and the outlet channels 12, the fluid is discharged via the outlet 17, heated by a heating device (not shown), and then fed back to the inlet 15.

[0045] In Fig. Figure 2a shows another embodiment of a roller 1'. The elements of the roller 1' that correspond to those of the roller 1 bear the same reference numerals, but with a single stroke.

[0046] Roller 1' differs from roller 1 essentially in that the course and position of the inlet channels 11' and outlet channels 12' as well as the connecting openings 13' deviate from those in roller 1. While in roller 1 the inlet and outlet channels 11, 12 run at an acute angle relative to the axis of rotation 3, in particular diagonally, the inlet and outlet channels 11', 12' run radially outwards perpendicular to the axis of rotation 3', in particular vertically.

[0047] Furthermore, in Fig. Figure 2b shows another alternative embodiment of a fluidically heated roller 1". Those elements of roller 1" that correspond to those of roller 1 bear the same reference numerals, but with two strokes.

[0048] In contrast to roller 1, the inlet 15" and outlet 17" in roller 1" are not located on opposite sides of roller 1" or axis of rotation 3", but rather on the same side of roller 1" or axis of rotation 3". The fluid inlet and outlet therefore occur via one side. This allows more installation space on the other side for a drive mechanism for roller 1". Essentially, one can speak of a drive side on the one hand and a heating side, which primarily serves a bearing function and not a drive function, on the other.

[0049] A bearing 51" has the fluid guidance system 53" described below. The fluid guidance system 53" comprises a central line 55" arranged in the central channel 9". Furthermore, a sealing element 57" is arranged in the central channel 9". The central line 55" extends through the sealing element 57". This allows heating fluid supplied via the inlet 15" to flow along the arrows in the Fig. 2b can flow, in particular can flow into an area 59" of the central channel.

[0050] The area 59" is thus closed on one side by the sealing element 57" and on the opposite side, the area 59" or the central channel 9" is closed by a sealing element 61". The sealing element 61" is located, in particular, on the drive side of the roller 1". From the area 59" the heating fluid flows through the connecting openings 13' into the inlet channels 11" and from there into the channels 7".

[0051] After passing through the channels 7", the fluid, having transferred at least some of its heating power to the roller 1, flows out of the channels 7 through the drain channels 12". It then flows into a section 63", which surrounds the central line 55". This section 63" is separated from the section 59" by the sealing element 57".

[0052] The fluid then flows from the drain channels 12", through the connecting openings leading into the area 59" into the area 59" and from there via a bearing element 65" of the bearing 51" into the drain 17".

[0053] Such fluidically heated rollers 1, 1', 1" have generally proven their worth, but have the disadvantage that the maximum temperature of the shell surface is limited due to the maximum temperature of the fluid.

[0054] It is therefore desirable to be able to convert the rollers 1, 1' to heating by an electric heating element, especially in order to achieve higher temperatures of the shell surface 5, 5'.

[0055] The invention enables such a conversion, which can now be carried out using the Fig. Sections 3 to 7b are explained. The conversion is explained using roller 1 as an example, whereby the conversion of roller 1' can be carried out analogously.

[0056] In Fig. Figure 3 shows a converted roller 101. The elements of roller 101 that correspond to those of roller 1 bear the same reference numerals, but increased by 100.

[0057] Again Fig. As can be seen in section 3, at least one heating element 119 is arranged in channels 107 for the conversion. In the Fig. Figure 3 shows this only for one channel 107, with further heating elements being arranged in the other, in particular all, channels 107.

[0058] The heating elements 119 have an outer diameter that is smaller than the inner diameter of the channels 107. In particular, the channels 107 are subject to large tolerances, since fluid heating does not place high demands on the uniformity of the inner diameter of the channels 107. Thus, creating an interference fit between the heating element 113 and the channel 107 is not possible without extensive modification of the channel 107. However, such modification of the channel 107, especially compensating for the tolerances, would necessitate extensive post-processing of the roller, particularly to avoid imbalances in the roller and to ensure smooth, vibration-free rotation of the roller 101. To nevertheless ensure efficient heat transfer from the heating elements 119 to the outer surface 105, the invention proposes that the gap between the heating element 119 and the channel 107 be bridged by a heat-conducting element.In the in . Fig. In the embodiment shown in Figure 3, the heat-conducting element comprises a powdered filler material 121. The filler material has a comparatively high graphite content, in particular more than 70%. This ensures high thermal conductivity and, at the same time, the powder form ensures complete filling of any gaps between the heating element 119 and the inner wall of the channel 107 when the filler material 121 is inserted. This prevents local thermal insulation between the heating element 119 and the inner wall of the channel 107 caused by air, which could otherwise lead to local overloading of the heating element due to insufficient heat dissipation from the heating element 119. Such overloading can lead to defects in the heating element, especially if temperatures of up to 750°C are to be generated on the outer surface 105.

[0059] During the Fig. In the 3 shown roller 101, a single heating element is inserted in the respective channel 107.

[0060] In the Fig. 4a and Fig. Figure 4b shows another embodiment of a roller 101'. Those elements of the roller 101' that correspond to those of the roller 101 bear the same reference numerals, but with a single hyphen. In contrast to the roller 101, the roller 101' has several heating elements 119a', 119b' arranged in a channel 107'. The heating elements 119a', 119b' can be controlled and regulated separately, so that desired heating profiles can be generated on the outer surface 105'. This also makes it possible to compensate for any fluctuations in the thermal conductivity of the outer surface 105'.

[0061] In Fig. Figure 4b shows the wiring of the heating elements 119a' and 119b'. Heating element 119a' is connected to a cover 125' in the area of ​​the inlet 115' via a cable 123a' that runs through the inlet channel 111', a connecting opening 113', and the central channel 109'. Heating element 119b' is also connected to the cover 125' via a cable 123b' that runs through the outlet channel 112', a connecting opening 113', and the central channel 109'. The rotating roller 101', and in particular the cables 123a' and 123b', are contacted, for example, via slip rings.

[0062] The cover 125' also fulfills further functions, in particular, besides guiding and protecting the cables 123a', 123b', it secures the heating elements 119a', 119b', e.g., against twisting, and provides thermal insulation for the side surfaces of the roller 101'. The securing of the heating elements 119a', 119b' can be further enhanced by pre-tensioning each heating element 119a', 119b' with a spring on one side facing away from the cover 125', in order to compensate for the thermal expansion of the heating elements 119a', 119b' along the axis of rotation 103'. The heating elements 119a', 119b' can be connected to the cover 125' by direct screwing to the cover 125' or by indirect connection via a fixing piece that is screwed to the respective heating element 119a', 119b'.

[0063] It is particularly preferred that, during the conversion of roller 1 into roller 101 or 101', the edges at the transition between the channels 107, 107', the inlet and outlet channels 111, 111', 112, 112', the connecting openings 113, 113' and / or the central channel 109, 109' are rounded. This prevents damage to the wiring 123a', 123b', for example, severing. Due to the accessibility of the respective channels, this can be achieved in particular by inserting a rotating deburring tool, such as a pipe deburrer and / or at least a conical milling cutter, into the respective channels, which is possible due to the diagonal orientation of the channels 111, 111', 112, 112' in roller 1, 101 or 101'.

[0064] In Fig. Figure 5 shows another embodiment of a roller 101". Those elements of the roller 101" that correspond to those of the roller 101 or 101' bear the same reference numerals, but with two strokes. Compared to the roller 101', the roller 101" has a single heating element 119", but this heating element 119" has several heating zones 127" compared to the heating element 119 of the roller 101. These heating zones can be controlled separately, similar to the heating elements 119a' and 119b', and thus enable the formation of a heating profile along the longitudinal axis of the roller 101", in particular along the axis of rotation 103".

[0065] Although in the Fig. 3, Fig. 4 to Fig. 5. A conversion of a roller according to the design of roller 1 of the Fig. As explained in section 1, a corresponding conversion can also be carried out on rollers according to the configuration of rollers 1' and / or 1" of the Fig. 2a or 2b, which have correspondingly different fluid guidance systems.

[0066] In the Fig. Figures 6 to 7b show an alternative embodiment of a roller 201. The elements corresponding to those of roller 101 bear the same reference numerals, but increased by 100.

[0067] In contrast to roller 101, the heat-conducting element in roller 201 is implemented by a clamping element in the form of a conical clamping element 229. The conical clamping element 229 can be used alternatively or additionally to the at least partially fluidal and / or castable heat-conducting element described above, in particular in the form of the filler material 121, 121', 121". For the sake of simplicity, the filler material is shown in the _ Fig. Parts 6 to 7b are omitted, but can be used in addition to the conical clamping element 229 or can be omitted entirely. Besides functioning as a heat-conducting element, the conical clamping element 229 also serves to fix the heating element 219 along a longitudinal or rotational direction of the roller 201.

[0068] The conical clamping element 229 comprises a metallic material with good thermal conductivity. The direct contact of the conical clamping element with the surface of the heating element 219 on the one hand and the inner wall of the channel 207 on the other ensures optimal heat transfer from the heating element 219 to the outer surface 205.

[0069] In Fig. 7a is a section A of roller 201 in Fig. Figure 6 shows the component without the conical clamping element 229. As can be seen, there is an air gap 231 between the heating element 219 and the outer surface 205. This leads to thermal insulation between the heating element 219 and the outer surface 205, or at least to a deterioration of the heat transfer from the heating element 219 to the outer surface 205.

[0070] In Fig. 7b is the same section A of roller 201 in Fig. 6 with the conical clamping element 229. As the Fig. As can be seen from Figure 7b, the conical clamping element 229 creates a direct bridge between the heating element 219 and the outer surface 205 via the inner wall of the channel 207. This ensures optimal heat transfer.

[0071] How Fig. As can also be seen in section 7b, the cone clamping element comprises several links 233 which, when compressed along the longitudinal direction 1, run up against each other over mutually inclined ramp surfaces 235 in such a way that the thickness d of the cone clamping element can be changed, in particular increased.

[0072] This compression of the conical clamping element 229 can, as in Fig. As shown in Figure 6, this is achieved by the conical clamping element 229 being supported on one side by a step 237 of the heating element 219 and on the other side by a fixing element 241 connected to the heating element 219 by means of a screw 239. The screw connection allows the distance between the step 237 and the fixing element 241, and thus the compression of the conical clamping element 229, to be changed.

[0073] Any remaining gaps between the conical clamping element 229 on the one hand and the heating element 219 or wall 207 on the other hand can optionally be filled by the at least partially fluid and / or castable heat-conducting element, in particular the filling material, thus optimizing heat conduction. However, the use of the at least partially fluid and / or castable heat-conducting element, in particular the filling material, is optional and can also be omitted.

[0074] The features described or disclosed in the foregoing description, the claims and the figures can be essential for the invention in its various embodiments, both individually and in any combination. REFERENCE MARK LIST 1, 1', 1" roller 3, 3', 3" axis of rotation 5, 5', 5" lateral surface area 7, 7', 7" channel 9, 9', 9" Central Channel 11, 11', 11" Inlet channel 12, 12', 12" drain channel 13, 13', 13" connection opening 15, 15', 15" inlet 17, 17', 17" Expiry 51" storage 53" Fluid Conduction System 55" central line 57" sealing element 59" area 61" locking element 63" area 101, 101', 101" roller 103, 103', 103" axis of rotation 105, 105, 105" lateral surface area 107, 107', 107" Channel 109, 109', 109" Central Channel 111, 111', 111" Inlet channel 112, 112' Drainage channel 113, 113', 113" connection opening 115, 115' Inlet 117, 117' Expiry 119, 119" heating element 119a', 119b' Heating element 121, 121', 121" Filling material 123a', 123b' cabling 125', 125" cover 127" heating zone 201 roller 205 lateral surface area Channel 207 219 Heating element 223 Cabling 225 Cover 229 Conical clamping element 231 air gap 233 members 235 ramp areas 237th level 239 screw 241 Fixing element A section d thickness l Longitudinal direction

Claims

[1] Roller (101, 201) for a rolling mill, embossing mill and / or printing mill, comprising at least one heating device for heating the shell surface (105, 205) of the roller (101, 201), wherein the heating device comprises at least one channel (107, 207) arranged inside the roller (101, 201), characterized by , that at least one electrical heating element (119, 219) is arranged within the channel (107 207), and at least one, at least partially fluidal and / or castable heat conducting element (121) is arranged in at least one space between an outer surface of the heating element (119, 219) and an inner wall of the channel (107, 207). [2] Roller according to claim 1, characterized by, that the channel (107, 207) is designed as a fluid channel, wherein the fluid channel is suitable for being supplied with at least one heating fluid, in particular before the heating element (119, 219) is arranged in the fluid channel (107, 207) or after the heating element (119, 219) has been removed from the fluid channel (107, 207). [3] Roller according to claim 2, characterized by that the heating fluid includes oil, water and / or a glycol-containing liquid. [4] Roller according to any of the preceding claims, characterized by , that the heat-conducting element further comprises at least one clamping element, in particular a conical clamping element (229), which can be brought into contact, in particular mechanical and / or heat-conducting contact, at least in certain areas with the outer surface of the heating element (219) and the inner surface of the channel (207). [5] Roller according to claim 4, characterized by, that the thickness of the clamping element (229) is variable and / or adjustable along a normal direction of the surface of the heating element (219) and / or a normal direction of the inner surface of the channel (207). [6] Roller according to claim 4 or 5, characterized by , that the clamping element (229) comprises at least in some areas at least a metallic material, optionally aluminium, copper, magnesium brass, bronze, silver, gold, and / or tungsten. [7] Roller according to any of the preceding claims, characterized by , that the at least partially fluidal and / or castable heat conducting element comprises at least a filler material (121) that is arranged at least partially in the space, optionally containing graphite. [8] Roller according to claim 7, characterized by, that the graphite content in the filler material (121) is more than 40%, preferably more than 50%, more preferably more than 60%, more preferably more than 70%, more preferably more than 80%, and most preferably more than 90%. [9] Roller according to claim 7 or 8, characterized by , that the filling material (121) is at least partially powdery, at least partially pasty, and / or at least partially highly viscous. [10] Roller according to any of the preceding claims, characterized by, that the heating element (119") has at least two, preferably a plurality of heating zones (127"), wherein the heating zones (127") are arranged along a longitudinal direction of the channel (107") and / or heating element (119") and / or the heating zones are arranged in a circular direction of the channel and / or the heating element (119") and / or the heating zones (127") have different first characteristics, in particular different heating powers and / or different heating times, . [11] Roller according to any of the preceding claims, characterized by , that at least two, preferably a plurality of heating elements (119a', 119b') are present, wherein the heating elements (119a', 119b') have different second characteristics, in particular different heating powers and / or different heating times. [12] Roller according to any of the preceding claims, characterized byat least one sensor, in particular a temperature sensor, that is inserted into the channel at least partially and / or is in operative contact with the channel. [13] Roller according to any of the preceding claims, characterized by , that the roller (101, 201) can be used in a printing unit, embossing unit and / or rolling mill for the production of elements of an electrical storage device, such as a battery, accumulator, capacitor, electrolyzer and / or fuel cell. [14] Printing, embossing and / or rolling mill, in particular for the manufacture of elements of an electrical storage device, such as a battery, accumulator, capacitor, electrolyzer and / or fuel cell, comprising at least one roller (101, 201) according to one of the preceding claims. [15] Method for converting a heating device of a roller comprising providing a roller (101, 201) having at least one fluid channel (107, 207) suitable for flow through by means of at least one heating fluid, Arrangement of at least one electrical heating element (119, 219) in the fluid channel (107, 207), and Arrangement of at least one at least partially fluidal and / or castable heat-conducting element (121) in at least one space between an outer surface of the heating element (119, 219) and an inner wall of the channel (107, 207). [16] Method according to claim 15, characterized by, that in at least one central channel (109'), at least one inlet channel (111'), in particular the fluid channel (107'), at least one outlet channel (112'), in particular the fluid channel (107') and / or at least one connecting opening (113'), in particular the central channel (109'), the inlet channel (111') and / or the outlet channel (112'), at least one wiring of the heating element (123a', 123b') is arranged. [17] Method according to claim 16, characterized by , that the arrangement of the wiring (123a', 123b') includes the prior smoothing and / or rounding of acute angled edges present in the fluid channel (107'), the drain channel (112'), the connecting opening (113'), the central channel (109') and / or the inlet channel (111'), optionally using at least one mechanical deburrer, optionally including at least one pipe deburrer and / or at least one conical milling cutter.

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