Heating device for heating roller, roller and calender or embossing box

Abstract

The invention relates to a heating device (1) for heating a roller (100) wherein the heating device (1) has a heating element (2) configured to be inserted into a bore (4) of the roller (100) and to provide and preferably electrically provide heating power and / or heat for heating the roller (100) and / or a roller body (3) of the roller (100), and wherein the heating device (1) has a clamping kit (7) arranged on a surface (12) of the heating element (2) and configured to contact an inner surface of the bore (4) and conductively transfer heat from the heating element (2) to the roller (100) and / or the roller body (3) when the heating device (1) is inserted into the bore (4) of the roller (100). The invention further relates to a roller (100). The invention further relates to a calender or an embossing box.

Description

[0001] The invention relates to a heating device for a heated roller and to a roller. The invention further relates to a calender or an embossing box.

[0002] Calenders and / or rollers are usually used for producing and / or coating web-like supports, such as films etc. Calenders and / or rollers are also used for producing electrodes, for example for batteries or battery cells, such as lithium-ion batteries or lithium-ion accumulators etc.

[0003] For example, cathodes and / or anodes of battery cells can be produced by various active material coatings on metal foils, for example made of copper for anodes or aluminum for cathodes. With the aid of a calender, also called a roller mill, a suitable coating, for example a suitable electrode material or active material, can be applied to the metal foil. Setting the correct temperature of the rollers is essential, since chemical adhesives or primers serving as adhesion promoters between the metal foil and the coating material, for example an electrode material or active material, are activated by thermal energy.

[0004] The embossing box may be configured to and / or be used to emboss and / or perforate the web material. The embossing box may also be referred to as an embossing calender. The embossing box may have a roller for embossing and / or perforating. The embossing box may have a second roller, such as a counter roller and / or a second embossing roller. The web material may be guided between the rollers of the embossing box. The web material may be embossed and / or perforated as it is guided through the embossing box. The web material may, for example, be or include a film. For example, the web material may include and / or consist of plastic and / or metal.

[0005] Important process and product parameters can be sensitively controlled via heated rollers. For example, the activation of the primer can be set so that the active materials adhere to each other and / or to the metal foil. By selecting the roller temperature, a precise setting of the total thickness of the electrode can be achieved and / or the ductility of the material can be adjusted, for example. In addition, stresses caused by temperature gradients in the rollers due to frictionally heated bearings can be dissipated or reduced.

[0006] It is known to heat rollers via oil heaters. Hot oil is guided through channels in the rollers to heat the rollers. Disadvantages of such oil heaters are, on the one hand, the use of oil as the working medium and the necessity of using external heaters for heating the oil as well as feed and discharge lines, and, on the other hand, the resulting relatively long lead times. The oil heater therefore requires a relatively long time until the rollers have been heated to a predetermined temperature. In addition, corresponding oil heaters are relatively expensive. Furthermore, the oil or thermal oil used for the oil heater is generally only stable up to approximately 250° C., so that the use of the oil heater at temperatures above 250° C. is not justified or even impossible.

[0007] Alternatively, it is known to heat the roller inductively. No working medium is required, but the roller is heated inductively by an electromagnetic field. Corresponding induction heaters have short lead times and can heat the roller to a specified temperature relatively quickly. However, this requires a high level of equipment expenditure as well as complex wiring and control. Induction heaters are also relatively expensive.

[0008] Electric heaters are known as another alternative. Holes are provided in the roller, into which the heating element is inserted. However, this has proven to be disadvantageous in that the heat generated by the heating element cannot be transferred well to the roller due to the holes.

[0009] In order to mount the corresponding heating element in the hole, a graphite paste is used to lubricate the heating element in order to simplify mounting, but this paste evaporates after a certain operating period. The heat transfer then takes place only via the air gap between the heating element and the roller body of the roller, which air gap is determined by the fit. This leads to a significant reduction in the heat transfer, since, on the one hand, the circumference of the heating element and therefore its surface in the radial direction is small, and, on the other hand, the roller and, in particular, the air located in the corresponding air gap between the heating element and the roller body after the graphite paste has evaporated, has a very low thermal conductivity. For example, the steel S355, of which the roller body usually consists or at least comprises, has a thermal conductivity of about 54 W / (m K), while air has a thermal conductivity of about 0.0262 W / (m K). The air gap therefore acts as a heat transfer resistance.

[0010] Therefore, the power required to heat the roller surface to the target temperature is usually not achieved during operation. In some cases, the heating element may even become too hot due to poor heat dissipation, so that it burns out or is damaged.

[0011] Therefore, electric heaters have not proven effective so far and oil heaters are the frequently used option.

[0012] These disadvantages are overcome by the heating device according to the invention as claimed in claim 1, the roller according to the invention as claimed in claim 9 and the calender or embossing box according to the invention as claimed in claim 15. The dependent claims each relate to particularly advantageous embodiments.

[0013] In particular, the object of the invention is to provide a heating device, a roller and a calender according to the invention which enable rapid heating of the roller. The heating device according to the invention and therefore the roller or calender or embossing box according to the invention are also easy to install and maintain and are cost-effective.

[0014] Existing calenders and / or rollers can also be simply and easily retrofitted with some embodiments of the heating device according to the invention.

[0015] A first aspect of the present invention relates to a heating device for a heating roller, wherein the heating device has a heating element, which is configured to be inserted into a hole in the roller and to provide heating power and / or heat for heating the roller and / or the roller body of the roller, and wherein the heating device has a clamping element, which is arranged on the surface of the heating element and is configured to contact the 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 the roller body.

[0016] The clamping element may contact a surface of the heating element.

[0017] The heating element may be configured to electrically provide heating power and / or heat. The heating element may be configured to convert electrical energy into heat. The heating element may have or be a heating cartridge, or may be so designated. The heating element may be or have a heating rod.

[0018] The clamping element may be annular.The clamping element may be or include a conical clamping element.

[0019] The clamping element and / or the conical 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 surface and the second surface may contact and / or support each other. The first surface and the second surface may slide relative to each other and / or on each other. It may be provided that the first inclined surface is inclined relative to the flat surface of the first clamping ring. It may be provided that the second inclined surface is inclined relative to the flat surface of the second clamping ring. The respective inclination angles may be selected so that when the first clamping ring and the second clamping ring contact each other with their inclined surfaces or one is located above the other, the corresponding flat surfaces may be aligned substantially parallel to each other. The inclination angles of the first inclined surface and / or the second inclined surface may be selected so that, for example, self-locking may occur if the heating device may be accommodated in one or the holes. Alternatively, one or the inclination angles of the first inclined surface and / or the second inclined surface may be selected so that, for example, self-locking may not occur if the heating device may be accommodated in one or the holes.

[0020] The clamping element may have a variable and / or adjustable thickness. The thickness of the clamping element may be variable and / or adjustable. If the first clamping ring has a first inclined surface and the second clamping ring has a second inclined surface, the thickness of the clamping element may be adjusted and / or varied by sliding and / or moving the first clamping ring and the second clamping ring relative to each other.

[0021] The clamping element may comprise one, more or all of the following: brass, bronze, aluminum, copper and / or steel, and / or an alloy comprising at least one of brass, bronze, aluminum, copper and / or steel. The clamping element may consist of one or more of brass, bronze, aluminum, copper and / or steel. The clamping element may have a thermal conductivity of 120 W / (m K). The clamping element may have a thermal conductivity greater than 120 W / (m K). The first clamping ring and / or the second clamping ring may comprise and / or consist of brass, bronze and / or steel.

[0022] The heating element may be rod-shaped.The clamping element may be arranged on a lateral 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] Another aspect of the invention relates to a roller having a roller body with one or more holes, wherein the roller has a heating device according to the invention, which is inserted into the hole, wherein a clamping element contacts the inner surface of the hole so that the heat provided by the heating element can be transferred conductively to the roller body and / or the roller via the clamping element.

[0026] In some embodiments, the roller may have exactly one hole. In some embodiments, the roller may have more than one hole. If the roller has more than one hole, a corresponding heating element may be inserted into at least one, a plurality of, or all of the holes. If the roller has more than one hole, in some embodiments, at least two, a plurality of, or all of the holes may be arranged at an angle to each other (e.g., at an angle of 60°). At least one of the holes may be inclined, e.g., inclined relative to the axis of symmetry and / or the longitudinal axis of the roller.

[0027] The hole may be arranged on or in the axis of symmetry of the roller.The hole may extend in the longitudinal direction of the roller.

[0028] The heating device may be mounted axially in the bore between the adapter and the spring.

[0029] The spring preload travel may be adjustable. The preload travel of the spring may be adjustable so that the axial preload on the heating device may be settable. The preload travel of the spring may be adjustable via a screw connection.

[0030] The hole can have a diameter between 5mm and 40mm. In some embodiments, the hole can have a diameter of 32mm. In some embodiments, the hole can have a diameter between 30.5mm and 33.5mm. If the roller has more than one hole, it can be provided that at least two, more or all holes have the same diameter. Alternatively or in addition, at least two, more or all holes can have different diameters. In some embodiments, holes of different diameters can achieve and / or help to accommodate different heating elements and / or heating devices. In some embodiments, the accommodation of heating devices and / or heating devices can be achieved in a flexible manner by having holes of different diameters.

[0031] The heating device or at least the heating element can be removably fastened to the roller and / or the hole. The heating device or at least the heating element can be fastened to the roller and / or the hole via a screw connection. The heating device or at least the heating element can be removably fastened to or together with the roller body and / or the roller pin. The heating device or at least the heating element can be fastened to or together with the roller body and / or the roller pin via a screw connection.

[0032] A further aspect of the invention relates to a calender having at least one roller according to the invention.Alternatively or additionally, the invention relates to an embossing box having at least one roller according to the invention.

[0033] The calender may have a pair of rollers, which may include two rollers according to the invention, wherein one of the rollers in the pair may be heated using corresponding heating means. The embossing box may have a pair of rollers, which may include two rollers according to the invention, wherein one of the rollers in the pair may be heated using corresponding heating means.

[0034] The present invention is further explained with reference to the following drawings. In the drawings:

[0035] Figure 1 : shows a roller known from the prior art;

[0036] Figure 2 : shows a comparison of a section of a roller known from the prior art and a section of a roller according to the invention;

[0037] Figure 3 : A perspective view showing an embodiment of a roller according to the present invention;

[0038] Figure 4 : shows a comparison of the time-temperature curves of a heated roller known from the prior art and a heated roller according to the invention.

[0039] Figure 1A roller 100 known from the prior art is shown. The roller 100 has a roller body 3. The roller 100 may be or include a calender roller. The roller 100 may be or include an embossing roller. The roller 100 may be or include an embossing roller. The roller body 3 may have a roller surface 109, which may be used for calendering and / or embossing. In some embodiments, the roller 100 may be configured and / or used for embossing, printing and / or perforating. The roller 100 may be configured to be used and / or employed in a calender and / or an embossing box.

[0040] Roller 100 and / or roller body 3 may be cylindrical and / or rod-shaped. Roller surface 109 may correspond to the lateral surface of roller 100. Roller 100 may have pins 107. Pins 107 may be used for mounting. Roller 100 may be clamped, for example, with pins 107. It may be provided that, in each case, pins 107 may be arranged at opposite ends of roller body 3. Roller 100 may have an axis of rotation X, about which the roller may rotate, for example, the roller may be rotatably mounted. Roller 100 has a hole 4. In some embodiments, hole 4 may extend completely through roller 100. It may be provided that hole 4 extends along the longitudinal direction L of roller 100. In some embodiments, hole 4 may extend along the axis of symmetry of roller 100, for example, the longitudinal axis and / or the axis of rotation X. It may be provided that hole 4 and / or the axis of extension of hole 4 may substantially coincide with one or the axis of symmetry, the longitudinal axis and / or the axis of rotation X of roller 100.

[0041] In the roller 100 known from the prior art, the heating element 2 is arranged in the hole 4. The heating element 2 can be and / or have a heating rod, for example. Between the heating element 2 and the inner surface 5 of the hole 4 there is an air gap 6. Figure 2 (Figure 1) shows the corresponding section of the roller 100 known from the prior art. In the roller 100 known from the prior art, the heating element 2 is therefore not in contact with the roller body 3 and / or the hole 4, but is separated from it by an air gap 6. The air gap 6 can be located between the lateral surface 12 of the heating element 2 and the inner surface 5 of the hole 4 and / or can be formed thereby. The air gap 6 can have a thickness S, which can be several millimeters in the embodiment of the roller 100 known from the prior art. Therefore, the air gap 6 acts as an insulator between the heating element 2 and the roller body 3. Therefore, the transfer of heat generated by the heating element 2 to the roller body 3 is reduced and / or limited by the air gap 6. This allows the roller 100 and / or the roller body 3 to heat slowly, and to reduce the maximum temperature. In addition, in some cases, the heating element 2 may be damaged by heat because the heat generated by it cannot be dissipated or is not properly dissipated.

[0042] Figure 2 (below) and Figure 3 1 shows a 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.

[0043] The heating device 1 according to the invention has a heating element 2 and a clamping element 7. The heating element 2 may correspond to a heating element 2 known from the prior art. The heating element 2 may be inserted into one or the holes 4 of the roller 100. The heating element 2 may provide heating power and / or heat for heating the roller 100 and / or the roller body 3. For example, the heating element 2 may provide heating power and / or heat electrically, and / or generate and / or convert heating power and / or heat from electrical energy. For example, the heating element 2 may be or include a heating rod.

[0044] The clamping element 7 is arranged on the surface of the heating element 2. The heating element 2 may be cylindrical and / or rod-shaped. The surface may, for example, be and / or correspond to the lateral surface 12 of the heating element 2. When the heating device 1 is inserted into one or the hole 4 of the roller 100, one or the inner surface 5 of the hole 4 may 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 may cause and / or provide heat conduction between the heating element 2 and the roller body 3.

[0045] In particular, the clamping element 7 can fill one or the air gap 6, in some embodiments substantially completely fill the air gap. The clamping element 7 can be annular and / or can have one or more clamping rings. It can be provided that the clamping element 7 has a first clamping ring 8 and a second clamping ring 9 and / or consists of one or more first clamping rings 8 and second clamping rings 9. The clamping element 7 can be or have a conical clamping element. The conical clamping element can have a first clamping ring 8 and a second clamping ring 9. The clamping element 7 can be conical. The first clamping ring 8 and / or the second clamping ring 9 can be conical.

[0046] If the clamping element 7 is annular, an increased effective surface and / or better heat transfer can be generated due to the contrast between the larger surface on the outer side of the annular clamping element 7 (which can contact the inner surface 5 of the hole 4 and / or it can basically correspond to the flat surface of the second clamping ring 9 or the second clamping ring 9) and the smaller surface of the heating element 2 (which can, for example, contact the inner surface of the annular clamping element 7 and / or it can basically correspond to the flat surface of the first clamping ring 8 or the first clamping ring 8).

[0047] The first clamping ring 8 may have an inclined first surface 10. The first clamping ring 8 may have a substantially straight surface, which may be arranged opposite to the inclined first surface 10. The first surface 10 may be tilted and / or tilted relative to the straight surface. The first clamping ring 8 may be wedge-shaped and / or have a wedge shape. The second clamping ring 9 may have an inclined second surface 11. The second clamping ring 9 may have a substantially straight surface, which may be arranged opposite to the inclined second surface 11. The first surface 11 may be tilted and / or tilted relative to the straight surface. The second clamping ring 9 may be wedge-shaped and / or have a wedge shape.

[0048] It can be provided that the straight surface of the first clamping ring 8 can contact the heating element 2 and / or its surface and / or lateral surface 12, for example, can contact it over a large area. The straight surface of the first clamping ring 8 can rest on the heating element 2 and / or its surface and / or lateral surface 12 and / or can be supported thereby. The straight surface of the second clamping ring 9 can contact the roller body 3 and / or the hole 4 and / or its inner surface 5, for example, can contact it over a large area. The straight surface of the second clamping ring 9 can rest on the roller body 3 and / or the hole 4 and / or its inner surface 5 and / or can be supported thereby.

[0049] The respective inclination angles of the first inclined surface 10 and the second inclined surface 11 can be selected so that when the first clamping ring 8 and the second clamping ring 9 are in contact with each other via the respective inclined surfaces 10, 11 and / or one is located above the other, the respective flat surfaces of the clamping rings 8, 9 are aligned parallel to each other and / or extend parallel to each other. In some embodiments, one or its respective inclination angle can be selected so that self-locking can occur. However, in some embodiments, one or the inclination angle can be selected so that self-locking does not occur. It can be provided that the inclination angle is selected so that the heating device 1, the heating element 2 and / or the clamping element 7 can be easily removed from the hole 4.

[0050] The clamping element 7 may have a plurality of or a large number of first clamping rings 8. The clamping element 7 may have a plurality of or a large number of first clamping rings 9. The first clamping ring 8 and the second clamping ring 9 may each be located one above the other and / or substantially in contact with each other in the radial direction. Adjacent first clamping rings 8 and / or second clamping rings 9 may be in contact with and / or fixed to each other laterally and / or axially. In some embodiments, the first clamping ring 8 may contact and / or fix an adjacent second clamping ring 9 laterally and / or axially. In some embodiments, the second clamping ring 9 may contact and / or fix an adjacent first clamping ring 8 laterally and / or axially.

[0051] The first clamping ring 8 and the second clamping ring 9 can be arranged so 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, the clamping element 7 can ensure good contact between the heating element 2 and the roller body 3. In addition, the adjustable and / or variable thickness D of the clamping element 7 allows the air gap 6 with different thicknesses S to be well bridged and / or filled. It can be provided that 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) are installed and / or fixed in the hole 4 so as to be displaced relative to each other in a manner to achieve the thickness D of the clamping element 7 and / or the clamping element 7 having a predetermined thickness D.

[0052] The clamping element 7 may be composed of or include a material that may have good thermal conductivity. The first clamping ring 8 and / or the second clamping ring 9 may be composed of or include a material that may have good thermal conductivity. In some embodiments, the material may be or include steel, bronze and / or brass. The material may be composed of a combination of multiple materials and / or may include multiple materials. In some embodiments, the material may be or include an alloy. In some embodiments, the clamping element 7 may have a thermal conductivity of 120 W / (m K). In some embodiments, the clamping element 7 may have a thermal conductivity greater than 120 W / (m K). In some embodiments, it may be provided that the first clamping ring 8 and the second clamping ring 9 are composed of different materials and / or have different materials. Alternatively, it may be provided that the first clamping ring 8 and the second clamping ring 9 are composed of and / or include the same material.

[0053] Figure 3 Various details and / or sections of an embodiment of a roller 100 according to the invention are shown. The roller 100 has a roller body 3. The roller 100 has a hole 4. The heating device 1 according to the invention is inserted into the hole 4. The roller 100 and / or the heating device 1 may have one, more or all of the features and / or advantages of the roller 100 and / or the heating device 1 described above.

[0054] A clearance fit of the heating element 2 in the hole 4 may be provided. 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 heating element 2 may have a diameter H between 27 mm and 29 mm. It may also be provided that the heating element 2 has a diameter H of 28 mm. The hole 4 may have a diameter B between 5 mm and 40 mm. The hole 4 may have a diameter B between 30.5 mm and 33.5 mm. It may be provided that the hole 4 may have a diameter B of 32 mm. The clamping element 7 may have a thickness D of 2 mm to 8 mm. In some embodiments, the clamping element 7 may have a thickness D of 3.5 mm to 4.5 mm. It may be provided that the clamping element 7 may have a thickness D of 4 mm.

[0055] 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, which may be used and / or used for calendering and / or embossing. The roller surface 109 may be or include the outer surface of the roller body 3. The roller 100 may have one or more pins 107. The pin 107 may be arranged at the far side. The pin 107 may be arranged at one end of the roller body 3. It may be provided that, in each case, the pin 107 may be arranged at the opposite end of the roller body 3. The pin 107 may be used to mount the roller 100, for example, in a rolling bearing or a pivot bearing. The roller 100 may be clamped via the pin 107.

[0056] The hole 4 may extend at least partially or completely through the roller 100 and / or the roller body 3. The hole 4 may be arranged along the longitudinal direction L of the roller 100 and / or the roller body 3. The hole 4 may be arranged and / or extend substantially parallel to the longitudinal direction L and / or the extension direction of the calender roller 100 and / or the roller body 3. It may be provided that the hole 4 may be arranged centrally. The hole 4 may substantially coincide with one or said rotation axis X of the roller 100.

[0057] 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 can be heated to a certain temperature, such as a predetermined temperature, by the heating device 1 and / or the heating element 2. In some embodiments, it can be provided that the temperature can be controlled and / or adjusted, and / or can be predetermined.

[0058] The heating element 2 may be cylindrical and / or rod-shaped. The heating element 2 may have a surface, for example, on the lateral surface 5. The clamping element 7 contacts the heating element 2, for example its surface and / or the lateral surface 5. The clamping element 7 contacts the inner surface 5 of the hole 4. The clamping element 7 may thus transfer heat from the heating element 2 to the inner surface 5 of the hole 4 and / or the roller body 3 and / or the roller 100, in particular by heat conduction. The clamping element 7 may, for example, have one or more of the above-mentioned first clamping ring 8 and the second clamping ring 9.

[0059] Figure 3 An example of accommodating and / or fastening the heating device 1 in the bore 4 is shown. The heating device 1 can be fixed in the axial direction, in particular in the longitudinal direction L. The roller 100 can have an adapter 101 and a screw connection 104, which can axially fix the heating device 1 and / or the heating element 2. The heating device 1 can be arranged in the bore 4 in the axial direction between the adapter 101 and the screw connection 104.

[0060] The adapter 101 can contact the heating device 1 and / or the heating element 2 in the axial direction and / or 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. In some embodiments, the adapter 101 can have a sleeve 105, which can contact the heating device 1 and / or the heating element 2, for example, can contact it laterally. The adapter 101 and / or the sleeve 105 can apply a force that can prevent the movement of the heating device 1 and / or the heating element 2 in one direction. For example, in Figure 3 In the arrangement shown, the adapter 101 and / or the sleeve 105 can counteract and / or prevent the heating device 1 and / or the heating element 2 from being inserted into the hole 4. Figure 3 Move "left" in the

[0061] In some embodiments, the adapter 101 and / or the sleeve 105 can contact the clamping element 7, for example, contact it laterally, and / or prevent and / or counteract the axial movement of the clamping element 7 in at least one direction. In some embodiments, the heating element 2 can have a stopper that the clamping element 7 can contact. In some embodiments, the clamping element 7 can be guided and / or pressed against the stopper. It can be provided that the adapter 101 and / or the sleeve 105 can push and / or press the clamping element 7 against the stopper, and / or the adapter 101 and / or the sleeve 105 can fix or lock the clamping element 7 axially together with the stopper.

[0062] The adapter 101 can be fastened, for example, via a detachable connection, for example with one or more screws 106. It can be provided that the adapter 101 can be fastened or mounted to the heating device 1 and / or the heating element 2 or fastened or mounted together with the heating device and / or the heating element. In some embodiments, the adapter 101 can be screwed to and / or fastened to the heating device 1 and / or the heating element 2 via one or the detachable connection, for example using one or more screws 106. In some embodiments, a second adapter 103 can be provided, which can fix the adapter 101 in the axial direction and / or exert a force on the adapter 101, which can counteract, prevent and / or prevent the adapter 101 from moving and / or displacing in one direction, for example parallel to the longitudinal direction L and / or the axial direction. It can be provided that the second adapter 103 can be screwed to the pin 107 and / or fastened thereon, for example.

[0063] The screw 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. The direction can be opposite to the direction that can prevent and / or stop the adapter 101 from moving. In some exemplary embodiments, the screw 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 screw connection 104 can include a pressure plate 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 thereto. For example, Figure 3 The screw connection 104 and / or the spring in the exemplary embodiment can counteract and / or lock a “rightward” movement and / or displacement of the heater 1 and / or the heating element 2 in the hole 4.

[0064] The screw connection 104 may be detachably fastened, for example, via one or more screws 106. In some embodiments, the screw connection 104 may be fastened to or together with the roller 100 and / or the pin 107.

[0065] The preload of spring 102 and / or the force, especially spring force, applied by spring 102 to heating device 1 and / or heating element 2 can be adjusted by screw connection 104. The spring travel and / or restoring force of spring 102 can be adjusted by screw connection 104. Spring 102 can be used as compression spring. Spring 102 can apply spring pressure and / or spring force to heating device 1 and / or heating element 2. Spring 102 can be a helical spring. In some embodiments, alternatively or additionally, pressure sheet 108 can be dimensioned in a manner that enables setting or will set a predetermined spring force and / or predetermined spring travel of spring 102, specifically with such length.

[0066] 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 fastened to the roller 100 and / or the roller body 3 or fastened together with the roller and / or the roller body. The clamping element 7 can be removably accommodated in the hole 4. The clamping element can be removably fastened to the roller 100 and / or the roller body 3 or fastened together with the roller and / or the roller body. This means that the heating device 1, the heating element 2 and / or the 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 easy and simple to retrofit an installed roller or calender using the heating device 1 according to the present invention.

[0067] In some embodiments, Figure 3 Reference numeral 13 in the figure can represent, for example, a cable, wire, hose and / or cable duct. In some embodiments, energy (e.g., electrical energy) that can be converted into heat by the heating element 2 can be provided and / or supplied to the heating device 1 and / or the heating element 2 via cables and / or wires.

[0068] Even though the heating element 2 may be or comprise an electric heating element, or at least may be designed to generate and / or convert heat from electrical energy, the invention is not necessarily limited to such heating elements. Other heating elements 2 which obtain, convert or at least provide heat in a different manner may also be envisaged.

[0069] The roller 100 may be part of a calender (not shown in the figure). 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 rollers 100 according to the invention.

[0070] Figure 4 An exemplary temperature curve over time of a roller 100 according to the invention is shown in comparison with a roller 100 known from the prior art. The roller 100 according to the invention may correspond to Figure 2 (below) and Figure 3The roller 100 shown and described in FIG. The roller 100 known from the prior art may correspond to Figure 1 and Figure 2 (above) Roller 100 shown and described.

[0071] The two rollers 100 compared differ only in the heating device 1 and the clamping element 7. That is, the respective roller bodies 3 and the holes 4 have the same dimensions. Both rollers 100, namely the roller 100 according to the invention and the roller 100 known from the prior art, are cooled on their outer surface or on the surface of the respective roller body 3 in order to describe the corresponding cooling of the roller surface during operation. The respective temperatures are measured at the same position centered (in the radial direction) in the roller body 3 parallel to the respective rotation axis X. The same amount of energy is supplied to the respective heating element 2.

[0072] As from Figure 4 It can be seen that the heating device 1 according to the invention enables the roller 100 according to the invention to be heated to a temperature of 80° C. in a time of approximately 72.5 minutes. In contrast, a time of approximately 90 minutes is required to heat the roller 100 known from the prior art. The invention thus makes it possible to significantly reduce the time required for heating to a predetermined temperature and thus provide a heating time with a shortened time difference Δt. Since the corresponding temperature curve is concave, the higher the time difference Δt, the higher the desired temperature or set target temperature.

[0073] Due to the invention, the heat transfer coefficient α of the heat transfer from the heating element 2 to the roller body 3 can be 1.2 times greater or more, for example 1.24 times greater, than the heat transfer coefficients known from the prior art.

[0074] The features of the invention disclosed in the above description, the drawings and the claims can be essential for implementing the invention both individually and in any combination.

[0075] Reference numerals list

[0076] 1 Heating device

[0077] 2 Heating elements

[0078] 3 roller body

[0079] 4 holes

[0080] 5Inner surface

[0081] 6 Air Gap

[0082] 7 Clamping elements

[0083] 8First clamping ring

[0084] 9 Second clamping ring

[0085] 10 First Surface

[0086] 11 Second Surface

[0087] 12 Lateral surface

[0088] 13 wires / cables / cable feeders / hose

[0089] 100 Rolls

[0090] 101 Adapter

[0091] 102 Spring

[0092] 103 Second adapter

[0093] 104 Screw connection

[0094] 105 Sleeve

[0095] 106 Screws

[0096] 107 Pins

[0097] 108 Pressure Plate

[0098] X rotation axis

[0099] L Longitudinal direction

[0100] H Diameter

[0101] D Thickness

[0102] B Diameter

[0103] S Thickness

[0104] Δt time difference.

Claims

1. A heating device (1) for heating a roller (100), wherein the heating device (1) has a heating element (2), which is configured to be inserted into a hole (4) of the roller (100) and provides, preferably electrically, heating power and / or heat for heating the roller (100) and / or a roller body (3) of the roller (100), and wherein the heating device (1) has a clamping element (7), which is arranged on a surface (12) of the heating element (2) and is configured to contact an inner surface of the hole (4) when the heating device (1) is inserted into the hole (4) of the roller (100) and conductively transfer heat from the heating element (2) to the roller (100) and / or the roller body (3).

2. The heating device (1) according to claim 1, wherein the clamping element (7) is annular and / or is or has a conical clamping element.

3. A heating device (1) according to any one of the preceding claims, wherein the clamping element (7) has a first clamping ring (8), the first clamping ring having a first inclined surface (10); and a second clamping ring (9), the second clamping ring having a second inclined surface (11), wherein the first surface (8) and the second surface (9) are in contact with and / or support each other.

4. The heating device (1) according to any of the preceding claims, wherein the clamping element (7) has a variable and / or adjustable thickness (D).

5. The heating device (1) according to any of the preceding claims, wherein the clamping element (7) comprises one, more or all of brass, bronze, aluminum, copper and / or steel, or consists of one, more or all of brass, bronze, aluminum, copper and / or steel.

6. The heating device (1) according to any of the preceding claims, wherein the heating element (2) is cylindrical and / or rod-shaped, wherein the clamping element (7) is arranged on a lateral surface (12) of the heating device (2).

7. The heating device (1) according to any of the preceding claims, wherein the heating element (2) has a diameter (H) between 5 mm and 40 mm, preferably a diameter (H) of 28 mm.

8. The heating device (1) according to any of the preceding claims, wherein the clamping element (7) has a thickness (D) of 2 mm to 8 mm, preferably a thickness (D) of 4 mm.

9. A roller (100) comprising a roller body (3), the roller body having one or more holes (4), wherein the roller (100) has a heating device (1) according to any one of the preceding claims, the heating device being inserted into the hole (4), wherein the clamping element (7) contacts the inner surface (5) of the hole (4) so ​​that the heat provided by the heating element (2) can be conductively transferred to the roller (100) and / or the roller body (3) through the clamping element (7).

10. Roller (100) according to claim 9, wherein the holes are arranged on or in an axis of symmetry of the roller (100), wherein the holes preferably extend in a longitudinal direction of the roller (100).

11. Roller (100) according to claim 9 or 10, wherein the heating device is mounted axially in the hole (4) between the adapter (101) and the spring (102).

12. Roller (100) according to claim 11, wherein the preload path of the spring (102) is adjustable, preferably via a screw connection (104), so that preferably the axial preload on the heating device (1) is adjustable.

13. Roller (100) according to any of the preceding claims 9 to 12, wherein the holes have a diameter between 5 mm and 40 mm, preferably a diameter of 32 mm.

14. A 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 detachably fastened to the roller (100) and / or the hole (4), preferably detachably fastened via a screw connection.

15. A calender or embossing box having at least one roller (100) according to any one of the preceding claims 9 to 14, wherein preferably, the calender or the embossing box has a pair of rollers, the pair of rollers comprising two rollers (100) according to any one of the preceding claims 9 to 14, the rollers being heated using corresponding heating devices.

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