Heating device for heating roller, roller, and calender or embossing cassette
Patent Information
- Application Number
- JP2024137530
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-08-21
- Filing Date
- 2024-08-19
- Publication Date
- 2025-03-06
Smart Images
Figure 2025029591000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a heating device for heating a roller and to a roller.The present invention further relates to a calender or embossing cassette. [Background technology]
[0002] Calenders and / or rollers are often used for the production and / or coating of web-shaped carriers, such as films. Calenders and / or rollers are also used, for example, for the production of electrodes for batteries or battery cells, such as lithium-ion batteries or lithium-ion accumulators.
[0003] For example, the positive and / or negative electrodes of a battery cell can be manufactured with various active material coatings on metal foils, e.g., copper for the negative electrodes or aluminum for the positive electrodes. A calender, also called a rolling mill, can be used to apply the appropriate coating, such as a suitable electrode material or active material, to the metal foil. The chemical binder or primer used as an adhesion promoter between the metal foil and the coating, such as the electrode material or active material, is activated by thermal energy, so it is essential to set the temperature of the roller accurately.
[0004] The embossing cassette may be configured and / or used to emboss and / or perforate the web-shaped material. The embossing cassette may also be referred to as an embossing calender. The embossing cassette may have rollers for embossing and / or perforating. The embossing cassette may have a second roller, such as a counter roller and / or a second embossing roller. The web-shaped material may be guided between the rollers of the embossing cassette. The web-shaped material may be embossed and / or perforated as it is guided through the embossing cassette. The web-shaped material may be or include a film, for example. For example, the web-shaped material may include and / or consist of plastic and / or metal.
[0005] Critical process and product parameters can be sensitively controlled via the heating of the roller. For example, the activation of the primer can be set to make the active materials adhere to each other and / or to the metal foil. By selecting the roller temperature, the total thickness of the electrodes can be set precisely and / or the ductility of the material can be adjusted, for example. Furthermore, stresses induced in the roller by temperature gradients due to frictionally heated bearings can be dissipated or reduced.
[0006] It is known to heat rollers via oil heaters. Hot oil is led through the channels of the rollers, which heat them up. Such oil heaters have the disadvantages that, on the one hand, oil is used as the working medium, an external heater is used to heat the oil, and furthermore, supply and discharge lines must be used, and, on the other hand, relatively long lead times arise. Thus, the oil heaters require a relatively long time until the rollers are heated to a given temperature. Furthermore, the corresponding oil heaters are relatively expensive. Moreover, the oil or heat transfer oil used in oil heaters is usually only stable up to about 250° C., so that the use of oil heaters at temperatures above 250° C. is not rational or possible.
[0007] Alternatively, inductively heated rollers are known. No working medium is required, rather the roller is inductively heated by an electromagnetic field. The corresponding induction heaters have short lead times and can heat the roller to a specified temperature relatively quickly, but require a high level of equipment expenditure along with complex cabling and controls. Induction heaters are also relatively expensive.
[0008] Electric heaters are known as another alternative: the roller is provided with holes into which a heating element is inserted, but this proves to be a drawback in that the holes do not allow a good transfer of the heat generated by the heating element to the roller.
[0009] To install the corresponding heating element in the hole, the heating element is lubricated with graphite paste to simplify installation, but this paste evaporates after a period of operation. Also, heat transfer occurs only through the gap between the heating element and the roller body of the roller, which is determined by the fit. This leads to a significant reduction in heat transfer, since on the one hand the circumference of the heating element and therefore its radial surface is smaller, and on the other hand the roller, especially the air located therein, is reduced. In the corresponding gap between the heating element and the roller body after the graphite paste has evaporated, the graphite paste has a very low thermal conductivity. For example, steel S355, of which the roller body often consists or at least contains, has a thermal conductivity of about 54 W / (mK), while air has a thermal conductivity of about 0.0262 W / (mK). The gap therefore acts as a heat transfer resistance.
[0010] As a result, the power required to heat the roller surface to the target temperature is often not achievable during operation, and in some cases the heating element may even become hot enough to burn out or be damaged due to insufficient heat dissipation.
[0011] For this reason, electric heaters have not proven effective to this point, and oil heaters are often the means of choice.
[0012] These disadvantages are overcome by the heating device according to the invention as claimed in claim 1, by the roller according to the invention as claimed in claim 9 and by the calender or embossing cassette according to the invention as claimed in claim 15. The respective dependent claims each relate to particularly advantageous embodiments.
[0013] In particular, it is an object of the present invention to provide a heating device, a roller and a calender according to the present invention, which allows for rapid heating of the roller. The heating device according to the present invention, and thus the roller or calender or embossing cassette according to the present invention, is furthermore easy to install and maintain and cost-effective.
[0014] Some embodiments of the heating device according to the present invention also allow for simple and easy retrofitting of existing calenders and / or rollers.
[0015] A first aspect of the present invention relates to a heating device for heating a roller, the heating device having a heating element configured to be inserted into a hole in the roller and to provide heating power and / or heat to heat the roller and / or a roller body of the roller, the heating device having a clamping element disposed on a surface of the heating element and configured to contact an inner surface of the hole when the heating device is inserted into the hole of the roller and to conductively transfer heat from the heating element to the roller and / or roller body.
[0016] The clamping element can contact a surface of the heating element.
[0017] The heating element can be configured to provide heating power and / or heat electrically. The heating element can be configured to convert electrical energy into heat. The heating element can have or be or be designated as a heating cartridge. The heating element can be or have a heating rod.
[0018] The clamping element may be annular. The clamping element may be or include a cone clamping element.
[0019] The clamping element and / or the cone clamping element may comprise a first clamping ring having a first inclined surface and a second clamping ring having a second inclined surface. The first and second surfaces may contact and / or support each other. The first and second surfaces may slide against each other and / or against each other. The first inclined surface may be provided to be inclined with respect to a straight surface of the first clamping ring. The second inclined surface may be provided to be inclined with respect to a straight surface of the second clamping ring. The respective inclination angles may be selected such that when the first and second clamping rings contact each other at their inclined surfaces or overlap each other, the corresponding straight surfaces are aligned substantially parallel to each other. The inclination angles of the first and / or second inclined surfaces may be selected such that self-locking can occur, for example, when a heating device can be accommodated in one or more holes. Alternatively, the inclination angles of the first and / or second inclined surfaces may be selected such that self-locking can occur, for example, when a heating device can be accommodated in one or more holes.
[0020] The clamping elements can have a variable and / or adjustable thickness. The thickness of the clamping elements can be variable and / or adjustable. If the first clamp ring has a first inclined surface and the second clamp ring has a second inclined surface, the thickness of the clamping elements can be adjusted and / or changed by sliding and / or moving the first clamp ring and the second clamp ring relative to one another.
[0021] The clamping element may include one, more, or all of brass, bronze, aluminum, copper, and / or steel, and / or an alloy including at least one of these. The clamping element may be composed of one or more of brass, bronze, aluminum, copper, and / or steel. The thermal conductivity of the clamping element may be 120 W / (mK). The thermal conductivity of the clamping element may be greater than 120 W / (mK). The first clamping ring and / or the second clamping ring may include and / or consist of brass, bronze, and / or steel.
[0022] The heating element may be cylindrical. The heating element may be rod-shaped. The clamping element may be disposed on an outer surface of the heating element.
[0023] The heating element may have a diameter between 5 mm and 40 mm. It may be provided that the heating element may have a diameter of 28 mm. In some embodiments, the heating element may have a diameter between 27 mm and 29 mm.
[0024] The clamping element may have a thickness of 2 mm to 8 mm. It may be provided that the clamping element may have a thickness of 4 mm. In some embodiments, the clamping element may have a thickness of 3.5 mm to 4.5 mm.
[0025] A further aspect of the present invention relates to a roller having a roller body with one or more holes, the roller having a heating device according to the present invention inserted into the holes, with clamping elements contacting the inner surface of the holes, and heat provided by the heating elements being conductively transferable by the clamping elements to the roller body and / or the roller.
[0026] In some embodiments, the roller may have exactly one hole. In some embodiments, the roller may have multiple holes. If the roller has multiple holes, corresponding heating elements may be inserted into at least one, multiple, or all of the holes. If the roller has multiple holes, in some embodiments, at least two, multiple, or all of the holes may be arranged at an angle to each other, for example, at an angle of 60°. At least one of the holes may be inclined, for example inclined with respect to the axis of symmetry and / or the longitudinal axis of the roller.
[0027] The holes may be located on or within the axis of symmetry of the roller. The holes may extend in the longitudinal direction of the roller.
[0028] The heating device may be mounted axially within the bore between the adapter and the spring.
[0029] The spring preload displacement may be adjustable. The spring preload displacement may be adjustable such that the axial preload of the heating device is settable. The spring preload displacement may be adjustable via a screw connection.
[0030] The diameter of the holes may be between 5 mm and 40 mm. In some embodiments, the diameter of the holes may be 32 mm. In some embodiments, the diameter of the holes may be between 30.5 mm and 33.5 mm. If the roller has multiple holes, it may be provided that at least two, multiple, or all of the holes have the same diameter. Alternatively or additionally, at least two, multiple, or all of the holes may have different diameters. In some embodiments, holes of different diameters may enable and / or facilitate the accommodation of different heating elements and / or heating devices. In some embodiments, the accommodation of heating devices and / or heating devices may be made possible in a flexible manner by holes of different diameters.
[0031] The heating device, or at least the heating element, may be removably fixed to the roller and / or bore. The heating device, or at least the heating element, may be fixed in the roller and / or bore via a screw connection. The heating device, or at least the heating element, may be removably fixed to or with the pin of the roller body and / or roller. The heating device, or at least the heating element, may be fixed to or with the pin of the roller body and / or roller via a screw connection.
[0032] Yet another aspect of the invention relates to a calender comprising at least one roller according to the invention.Alternatively or additionally, the invention relates to an embossing cassette comprising at least one roller according to the invention.
[0033] The calender may have a pair of rollers, the opposing rollers may include two rollers according to the present invention, and the rollers of the pair of rollers may be heated using a corresponding heating device. The embossing cassette may have a pair of rollers, the opposing rollers may include two rollers according to the present invention, and the rollers of the pair of rollers may be heated using a corresponding heating device.
[0034] The invention is further explained with reference to the following figures. [Brief description of the drawings]
[0035] [Figure 1] 1 shows a roller known from the prior art; [Diagram 2] 1 shows a comparison of the cross-section of a roller known from the prior art with the cross-section of a roller according to the invention. [Diagram 3] 1 shows a perspective view of an embodiment of a roller according to the present invention. [Figure 4] 2 shows a comparison of the temporal temperature profile of a heated roller known from the prior art and a heated roller according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0036] FIG. 1 shows a roller 100 known from the prior art. The roller 100 has a roller body 3. The roller 100 may be or may include a calender roller. The roller 100 may be or may include an embossing roller. The roller 100 may be or may include an etched roller. The roller body 3 may have a roller surface 109 that can be used for calendering and / or embossing. In some embodiments, the roller 100 may be configured and / or used for engraving, printing and / or perforating. The roller 100 may be configured to be used and / or used in or with a calender and / or embossing cassette.
[0037] The roller 100 and / or the roller body 3 may be cylindrical and / or rod-shaped. The roller surface 109 may correspond to the outer surface of the roller 100. The roller 100 may have a pin 107. The pin 107 may be used for mounting. The roller 100 may, for example, be clamped with the pin 107. In both cases, it may be provided that the pin 107 may be arranged at an opposite position on the roller body 3. The roller 100 may have an axis of rotation X about which the roller 100 may rotate, for example, be rotatably mounted. The roller 100 has a hole 4. In some embodiments, the hole 4 may extend completely through the roller 100. The hole 4 may be provided to extend along the longitudinal direction L of the roller 100. In some embodiments, the hole 4 may extend along an axis of symmetry of the roller 100, for example along the longitudinal axis and / or the axis of rotation X. The holes 4 and / or the extension axes of the holes 4 may substantially coincide with one or more of the axes of symmetry, longitudinal axis, and / or rotation axis X of the roller 100 .
[0038] In the roller 100 known from the prior art, a heating element 2 is provided in the hole 4. The heating element 2 can be and / or can comprise, for example, a heating rod. Between the heating element 2 and the inner surface 5 of the hole 4, there is a gap 6. Figure 2 (top view) shows the corresponding cross section of the roller 100 known from the prior art. Thus, in the roller 100 known from the prior art, the heating element 2 cannot come into contact with the roller body 3 and / or the hole 4, but is separated from them by the gap 6. The gap 6 can be located between and / or formed by the outer surface 12 of the heating element 2 and the inner surface 5 of the hole 4. The gap 6 can have a thickness S, which in an embodiment of the roller 100 known from the prior art can be several millimeters. The gap 6 therefore acts as a thermal insulator between the heating element 2 and the roller body 3. The transfer of heat generated by the heating element 2 to the roller body 3 is therefore reduced and / or limited by the gap 6. This results in a slower heating of the roller 100 and / or the roller body 3, which reduces the maximum temperature. Furthermore, in some cases the heating element 2 may be damaged by heat because the heat generated is not or cannot be dissipated properly.
[0039] A cross-section of an embodiment of a roller 100 according to the invention and a roller 100 according to the invention, each having a heating device 1 according to the invention, are shown in FIG. 2 (bottom) and FIG.
[0040] The heating device 1 according to the invention comprises a heating element 2 and a clamping element 7. The heating element 2 can correspond to heating elements 2 known from the prior art. The heating element 2 can be inserted into one or more holes 4 of the roller 100. The heating element 2 can provide heating power and / or heat to heat the roller 100 and / or the roller body 3. For example, the heating element 2 can provide heating power and / or heating electrically and / or generating and / or converting it from electrical energy. The heating element 2 can for example be or include a heating rod.
[0041] The clamping element 7 is arranged on a surface of the heating element 2. The heating element 2 can be cylindrical and / or rod-shaped. This surface can for example be and / or correspond to the outer surface 12 of the heating element 2. When the heating device 1 is inserted into one or more holes 4 of the roller 100, a part or the whole of the inner surface 5 of the hole 4 can be contacted by the clamping element 7. This allows heat to be conductively transferred from the heating element 2 to the roller 100 and / or the roller body 3. The clamping element 7 can cause and / or provide thermal conduction between the heating element 2 and the roller body 3.
[0042] In particular, the clamping element 7 may fill a portion or the entirety of the void 6, and in some embodiments essentially completely fills it. The clamping element 7 may be annular and / or may have one or more clamp rings. It may be provided that the clamping element 7 has a first clamp ring 8 and a second clamp ring 9 and / or consists of one or more of a first clamp ring 8 and a second clamp ring 9. The clamping element 7 may be or may have a cone clamping element. The cone clamping element may have a first clamp ring 8 and a second clamp ring 9. The clamping element 7 may be cone-shaped. The first clamp ring 8 and / or the second clamp ring 9 may be cone-shaped.
[0043] If the clamping element 7 is annular, the effective surface may be increased and / or better heat transfer may be obtained due to the larger outer surface of the annular clamping element 7. This is due to the larger outer surface of the clamping element 7 (which may contact the inner surface 5 of the hole 4 and / or may approximately correspond to the face of the second clamping ring 9 or the face of the second clamping ring 9) compared to the smaller surface of the heating element 2 (which may contact the inner surface of the annular clamping element 7 and / or may approximately correspond to the face of the first clamping ring 8 or the face of the first clamping ring 8). The first clamp ring 8 may have an inclined first surface 10. The first clamp ring 8 may have a substantially straight surface, which may be disposed opposite the inclined first surface 10. The first surface 10 may be oblique and / or inclined relative to the straight surface. The first clamp ring 8 may be wedge-shaped and / or have a wedge shape. The second clamp ring 9 may have an inclined second surface 11. The second clamp ring 9 may have a substantially straight surface, which may be disposed opposite the inclined second surface 11. The first surface 10 may be oblique and / or inclined relative to the straight surface. The second clamp ring 9 may be wedge-shaped and / or have a wedge shape.
[0044] The straight surface of the first clamp ring 8 can be in contact with the heating element 2 and / or its surface and / or outer surface 12 can be provided to be in contact with the heating element 2, for example over a large area. The straight surface of the first clamp ring 8 can rest on and / or be supported by the heating element 2 and / or its surface and / or outer surface 12. The straight surface of the second clamp ring 9 can be in contact with the roller body 3 and / or the bore 4 and / or its inner surface 5, for example over a large area. The straight surface of the second clamp ring 9 can be in contact with and / or be supported by the roller body 3 and / or the bore 4 and / or its inner surface 5.
[0045] The respective inclination angles of the first inclined surface 10 and the second inclined surface 11 may be selected such that when the first clamp ring 8 and the second clamp ring 9 contact each other and / or contact each other via the respective inclined surfaces 11 and / or lie on one inclined surface 11, the respective linear surfaces of the clamp rings 8, 9 are aligned parallel to each other and / or are parallel to each other. In some embodiments, the respective inclination angle or angles may be selected such that self-locking may occur. However, in some embodiments, the respective inclination angle or angles may be selected in such a way that self-locking does not occur. The inclination angle(s) may be selected such that the heating device 1, the heating element 2, and / or the clamping element 7 may be easily removed from the hole 4.
[0046] The clamping element 7 can have a plurality or a number of first clamp rings 8. The clamping element 7 can have a plurality or a number of first clamp rings 9. The first clamp ring 8 and the second clamp ring 9 can be located one on top of the other. They can be either separate top joints and / or essentially in radial contact with each other. Adjacent first clamp rings 8 and / or second clamp rings 9 can be in lateral and / or axial contact and / or fixed to each other. In some embodiments, the first clamp ring 8 can be in lateral and / or axial contact and / or fixed to the adjacent second clamp ring 9. In some embodiments, the second clamp ring 9 can be in lateral and / or axial contact and / or fixed to the adjacent first clamp ring 8.
[0047] The first clamping ring 8 and the second clamping ring 9 can be arranged such that the inclined first surface 10 and the inclined second surface 11 are in contact with each other. The first clamping ring 8 and / or the second clamping ring 9 can slide and / or move relative to each other. Due to the inclined surfaces of the first clamping ring 8 and the second clamping ring 9, the thickness D of the clamping element 7 can be adjusted and / or changed. In this way, a good contact between the heating element 2 and the roller body 3 can be ensured by the clamping element 7. Furthermore, due to the adjustable and / or variable thickness D of the clamping element 7, a gap 6 of different thickness S is formed, which is sufficiently bridged and / or filled. The clamping element 7 and / or the first clamping ring 8 and the second clamping ring 9 (or a plurality of first clamping rings 8 and correspondingly a plurality of second clamping rings 9) can be fixed and / or fixed in the hole 4 to be displaced relative to each other such that the thickness D of the clamping element 7 is achieved and / or the clamping element 7 has a predetermined thickness D.
[0048] The clamping element 7 may be made of or may include a material that may have good thermal conductivity. The first clamping ring 8 and / or the second clamping ring 9 may be made of or may include a material that may have good thermal conductivity. In some embodiments, the material may be or may include steel, bronze, and / or brass. The material may be made of and / or may include a composition of materials. In some embodiments, the material may be or may include an alloy. In some embodiments, the clamping element 7 may have a thermal conductivity of 120 W / (mK). In some embodiments, the clamping element 7 may have a thermal conductivity higher than 120 W / (mK). In some embodiments, it may be provided that the first clamping ring 8 and the second clamping ring 9 may be made of and / or include different materials. Alternatively, it may be provided that the first clamping ring 8 and the second clamping ring 9 may be made of and / or include the same material.
[0049] 3 shows various details and / or cross sections of an embodiment of a roller 100 according to the invention. The roller 100 has a roller body 3. The roller 100 has a hole 4. A heating device 1 according to the invention is inserted in the hole 4. The roller 100 and / or the heating device 1 can have one, several or all of the features and / or advantages of the roller 100 and / or the heating device 1 described above.
[0050] A clearance fit of the heating element 2 may be provided in the hole 4. The clearance fit may be bridged and / or filled by the clamping element 7. The heating element 2 may have a diameter H between 5 mm and 40 mm. The diameter H of the heating element 2 may be between 27 mm and 29 mm. It may also be provided that the heating element 2 may have a diameter H of 28 mm. The diameter B of the hole 4 may be between 5 mm and 40 mm. The diameter B of the hole 4 may be between 30.5 mm and 33.5 mm. It may also be provided that the hole 4 may have a diameter B of 32 mm. The thickness of the clamping element 7 may be between 2 mm and 8 mm. In some embodiments, the clamping element 7 may have a thickness D between 3.5 mm and 4.5 mm. It may also be provided that the thickness D of the clamping element 7 may be 4 mm.
[0051] The roller 100 and / or the roller body 3 may be cylindrical and / or rod-shaped. The roller 100 and / or the roller body 3 may have a roller surface 109 that may serve and / or be used for calendering and / or embossing. The roller surface 109 may be or may include the outer surface of the roller body 3. The roller 100 may have one or more pins 107. The pins 107 may be located on the distal side. The pins 107 may be located at one end of the roller body 3. It may be provided that in either case the pins 107 may be located at the opposite end of the roller body 3. The pins 107 may be used to mount the roller 100. For example, they are used in rolling or pivot bearings. The roller 100 may be clamped via the pins 107.
[0052] The holes 4 can extend at least partially or completely through the roller 100 and / or the roller body 3. The holes 4 can be arranged along the longitudinal direction L of the roller 100 and / or the roller body 3. The holes 4 can be arranged and / or extend substantially parallel to the longitudinal direction L and / or the extension direction of the calender roll 100 and / or the roll body 3. It may be provided that the holes 4 can be arranged centrally. The holes 4 can essentially coincide with the rotation axis X of one or more rollers 100.
[0053] The heating device 1 and / or the heating element 2 are configured to heat the roller 100 and / or the roller body 3. The roller 100 and / or the roller body 3 may be heated to a temperature, e.g. a predetermined temperature, by the heating device 1 and / or the heating element 2. In some embodiments it may be provided that the temperature is controllable and / or adjustable and / or predeterminable.
[0054] The heating element 2 can be cylindrical and / or rod-shaped. The heating element 2 can have a surface, e.g. an outer surface 5. The clamping element 7 contacts the heating element 2, e.g. its surface and / or outer surface 5. The clamping element 7 contacts the inner surface 5 of the hole 4. The clamping element 7 can thus transfer heat from the heating element 2 to the inner surface 5 of the hole 4 and / or to the roller body 3 and / or the roller 100, in particular by thermal conduction. The clamping element 7 can for example comprise one or more of the first clamping ring 8 and the second clamping ring 9 mentioned above.
[0055] 3 shows an example of the accommodation and / or fixation of the heating device 1 in the bore 4. The heating device 1 can be fixed axially, in particular in the longitudinal direction L. The roller 100 comprises an adapter 101 and a threaded connection 104 in which the heating device 1 and / or the heating element 2 can be fixed axially. The heating device 1 can be arranged in the bore 4 in the axial direction between the adapter 101 and the threaded connection 104.
[0056] The adapter 101 can be in axial contact with the heating device 1 and / or heating element 2 and / or can counteract the displacement and / or movement of the heating device 1 and / or heating element 2 in at least one direction axially parallel to the adapter 101. In some embodiments, the adapter 101 can have a sleeve 105 that can be in contact with the heating device 1 and / or heating element 2, for example in lateral contact therewith. The adapter 101 and / or sleeve 105 can exert a force that can prevent the movement of the heating device 1 and / or heating element 2 in one direction. For example, in the arrangement shown in FIG. 3, the adapter 101 and / or sleeve 105 can counteract and / or prevent the movement of the heating device 1 and / or heating element 2 "to the left" in FIG. 3 within the bore 4.
[0057] In some embodiments, the adapter 101 and / or sleeve 105 can contact the clamping element 7, for example, laterally and / or can block and / or counteract axial movement of the clamping element 7 in at least one direction. In some embodiments, the heating element 2 can have a stop against which the clamping element 7 can contact. In some embodiments, the clamping element 7 can be guided and / or pressed against the stop. The adapter 101 and / or sleeve 105 can push and / or press the clamping element 7 against the stop and / or the adapter 101 and / or sleeve 105 together with the stop can be axially fixed, locking the clamping element 7.
[0058] The adapter 101 can be fixed, for example, via a removable connection with one or more screws 106. It may be provided that the adapter 101 can be fixed or attached to or with the heating device 1 and / or the heating element 2. In some embodiments, the adapter 101 can be screwed and / or fixed to the heating device 1 and / or the heating element 2 via one or more removable connections, for example using one or more screws 106. In some embodiments, a second adapter 103 can be provided that can axially fix the adapter 101 and / or exert a force on the adapter 101, which can counteract, block and / or prevent movement and / or displacement of the adapter 101 in one direction. For example, arranged parallel to the longitudinal direction L and / or the axial direction. It may be provided, for example, that the second adapter 103 can be screwed to and / or fixed on the pin 107.
[0059] The threaded connection 104 can counteract the displacement and / or movement of the heating device 1 and / or the heating element 2 in at least one direction parallel to the axial direction. This direction can be opposite to the direction in which the adapter 101 can prevent and / or block the movement. In some exemplary embodiments, the threaded connection 104 can contact the heating device 1 and / or the heating element 2 in the axial direction. In some embodiments, a spring 102 can be provided, which can be arranged between the heating device 1 and the threaded connection 104. In some embodiments, the threaded connection 104 can include a pressure member 108 that can act on the spring 102. The spring 102 can contact the heating device 1 and / or the heating element 2, for example, laterally contacting them. For example, the threaded connection 104 and / or the spring in the exemplary embodiment of FIG. 3 can counteract and / or lock the movement and / or displacement of the heater 1 and / or the heating element 2 in the hole 4 "to the right".
[0060] The threaded connection 104 may be removably secured, for example, via one or more screws 106. In some embodiments, the threaded connection 104 may be secured to or with the rollers 100 and / or pins 107.
[0061] The preload of the spring 102 and / or the force exerted by the spring 102 on the heating device 1 and / or the heating element 2, in particular the spring force, can be adjusted by the screw connection 104. The spring movement and / or the restoring force of the spring 102 can be adjusted by the screw connection 104. The spring 102 can function as a compression spring. The spring 102 can exert a spring pressure and / or a spring force on the heating device 1 and / or the heating element 2. The spring 102 can be a spiral spring. In some embodiments, alternatively or additionally, the pressure member 108 can be set or can be dimensioned, in particular can have a length, such that a predetermined spring force and / or a predetermined spring movement of the spring 102 can be set.
[0062] The heating device 1 and / or the heating element 2 can be removably accommodated in the hole 4. The heating device 1 and / or the heating element 2 can be removably fixed to or with the roller 100 and / or the roller body 3. The clamping element 7 can be removably accommodated in the hole 4. The clamping element can be removably fixed to or with the roller 100 and / or the roller body 3. This means that the heating device 1, the heating element 2 and / or the clamping element. This clamping element can be easily and simply installed or removed. For example, a defective heating element 2 can be quickly and easily replaced. It is also possible to easily and simply retrofit already installed rollers or calenders with the heating device 1 according to the invention.
[0063] 3 may denote, for example, cables, wires, hoses, and / or cable ducts. In some embodiments, energy that can be converted into heat by the heating element 2, for example electrical energy, may be provided and / or supplied to the heating device 1 and / or the heating element 2 by cables and / or wires.
[0064] The heating element 2 may be or may include an electric heating element, or may at least be designed to generate and / or convert heat from electrical energy, although the invention is not necessarily limited to such heating elements. Other heating elements 2 that obtain, convert, or at least provide heat in different ways are also contemplated.
[0065] The roller 100 may be part of a calender (not shown in the figures). The calender may have one or more rollers 100 according to the invention. For example, the calender may have at least one pair of rollers, which may be formed by the rollers 100 according to the invention.
[0066] Figure 4 shows an exemplary temperature profile of a roller 100 according to the invention compared to a roller 100 known from the prior art as a function of time. The roller 100 according to the invention may correspond to the roller 100 shown and described in Figures 2 (below) and 3. The roller 100 known from the prior art may correspond to the roller 100 shown and described in Figures 1 and 2 (above).
[0067] The two rollers 100 compared differ only in the heating device 1 and the clamping element 7. In other words, the respective roller bodies 3 and holes 4 have the same dimensions. In order to depict the corresponding cooling of the roller surfaces during operation, both rollers 100, i.e. both the roller 100 according to the invention and the roller 100 known from the prior art, were cooled on their outer surface, or on the surface of the respective roller bodies 3. The respective temperatures were measured at the same central position (radially) in the roller body 3, parallel to the respective rotation axis X. The same amount of energy was supplied to each heating element 2.
[0068] As can be seen from Fig. 4, the heating device 1 according to the invention makes it possible to heat the roller 100 according to the invention to a temperature of 80°C within a time of about 72.5 minutes. In contrast, heating the roller 100 known from the prior art requires a time of about 90 minutes. The invention therefore allows a significant reduction in the time necessary for heating to a given temperature, thus providing a heating time that is shortened by the time difference Δt. The higher the desired temperature or set target temperature, the greater the time difference Δt, since the respective temperature curves are concave.
[0069] The heat transfer coefficient α of the heat transfer from the heating element 2 to the roller body 3 can be increased by a factor of more than 1.2, for example by a factor of 1.24, according to the invention, than is known from the prior art.
[0070] The features of the invention disclosed in the above description, in the drawings and in the claims may be essential for the implementation of the invention both individually and in any combination. [Explanation of symbols]
[0071] 1 Heating device 2 heating elements 3 Roller body 4 holes 5. Inside 6 void 7 Clamping Elements 8 First clamp ring 9 Second clamp ring 10 First Surface 11 The Second Surface 12 External surface 13 Lines / Cables / Cable Feeds / Hoses 100 Lola 101 Adapter 102 Spring 103 Second Adapter 104 Threaded Connection 105 Sleeve 106 Screw 107 Pin 108 Pressurizing section X Rotation Axis L Longitudinal H diameter D Thickness B diameter S Thickness Δt Time difference
Claims
1. A heating device (1) for heating a roller (100), said heating device (1) having a heating element (2), said heating element being inserted into a hole (4) of said roller (100) and preferably configured to electrically provide heating power and / or heat to heat said roller (100) and / or a roller body (3) of said roller (100), said heating device (1) having a clamping element (7) arranged on a surface (12) of said heating element (2) and configured to contact an inner surface of said hole (4) when said heating device (1) is inserted into said hole (4) of said roller (100) and to conductively transfer heat from said heating element (2) to said roller (100) and / or said roller body (3).
2. 2. The heating device (1) according to claim 1, wherein the clamping element (7) is or has an annular and / or conical clamping element.
3. 10. The heating device (1) according to any one of the preceding claims, wherein the clamping element (7) comprises a first clamping ring (8) having a first inclined surface (10) and a second clamping ring (9) having a second inclined surface (11), the first surface (8) and the second surface (9) being in contact with and / or supporting each other.
4. 10. The heating device (1) according to any one of the preceding claims, wherein the clamping element (7) has a variable and / or adjustable thickness (D).
5. 10. The heating device (1) according to any one of the preceding claims, wherein the clamping element (7) comprises or consists of one, several or all of brass, bronze, aluminium, copper and / or steel.
6. 10. The heating device (1) according to any one of the preceding claims, wherein the heating element (2) is cylindrical and / or rod-shaped and the clamping element (7) is arranged on an outer surface (12) of the heating element (2).
7. Heating device (1) according to any one of the preceding claims, wherein said heating element (2) has a diameter (H) of between 5 mm and 40 mm, preferably a diameter (H) of 28 mm.
8. Heating device (1) according to any one of the preceding claims, wherein said clamping element (7) has a thickness (D) of between 2 mm and 8 mm, preferably a thickness (D) of 4 mm.
9. A roller (100) having a roller body (3) having one or more holes (4), the roller (100) having a heating device (1) according to any one of the preceding claims, inserted into the holes (4) and the clamping element (7) contacting an inner surface (5) of the holes (4), whereby heat provided by the heating element (2) can be conductively transferred to the roller (100) and / or the roller body (3) via the clamping element (7).
10. 10. The roller (100) of claim 9, wherein the holes are arranged on or within an axis of symmetry of the roller (100), the holes preferably extending in the longitudinal direction of the roller (100).
11. A roller (100) according to claim 9 or 10, wherein the heating device is axially mounted in the bore (4) between an adapter (101) and a spring (102).
12. 12. The roller (100) of claim 11, wherein the preload path of the spring (102) is adjustable, preferably via a threaded connection (104), such that the axial preload of the heating device (1) is adjustable.
13. A roller (100) according to any one of the preceding claims 9 to 12, wherein said holes have a diameter between 5 mm and 40 mm, preferably a diameter of 32 mm.
14. The roller (100) according to any one of the preceding claims 9 to 13, wherein the heating device (1), or at least the heating element (2), is removably fixed to the roller (100) and / or in the hole (4), preferably via a threaded connection.
15. A calender or embossing cassette comprising at least one roller (100) according to any one of the preceding claims 9 to 14, preferably having a pair of rollers comprising two rollers (100) according to any one of the preceding claims 9 to 14, said calender or said embossing cassette being heated using a corresponding heating device.