DE102009054553A1 - Format cooling for a filter rod machine - Google Patents

Abstract

The invention relates to a cooling device (20, 40) for a format device of a machine of the tobacco processing industry, in particular a filter rod machine, wherein the cooling device (20, 40) at least one cooling web (7, 7 ', 45, 45') and at least one heat sink (6, 6 ', 43, 43', 44, 44 ') which is formed integrally with the at least one cooling web (7, 7', 45, 45 ') or with the at least one cooling web (7, 7', 45, 45 ') is thermally conductively connected or connectable. The invention further relates to a method for operating a machine of the tobacco processing industry, in particular filter rod machine, wherein a filter strand (8, 8 ') is wrapped with a wrapping paper strip, which is provided at an adhesive seam with a glue, in particular a hot melt, wherein the wrapped filter strand (8, 8 ') is conveyed by a format device having an upper format and / or a lower format with a cooling web (7, 7', 45, 45 ') for the adhesive seam, and a use.
The cooling device (20, 40) according to the invention is characterized in that it comprises at least one Peltier element (23, 23 ') by means of which the cooling body (6, 6', 43, 43 ', 44, 44') can be cooled ,

Description

The invention relates to a cooling device for a format device of a machine of the tobacco processing industry, in particular a filter rod machine, wherein the cooling device comprises at least one cooling web and at least one heat sink, which is integrally formed with the at least one cooling web or is thermally conductively connected to the at least one cooling web or connectable. The invention further relates to a method for operating a machine of the tobacco processing industry, in particular filter rod machine, wherein a filter strand is wrapped with a wrapping paper strip, which is provided at an adhesive seam with a glue, in particular a hot glue, wherein the wrapped filter strand conveyed by a format device which has an upper format and / or a lower format with a cooling web for the adhesive seam, as well as a use.

Tobacco-processing machines that produce filter strands from a filter tow or other material and wrap them with a wrapping paper are sold under the names KDF and SEF, among others, by the Applicant. The conveying speed of a filter strand with, for example, a KDF is currently about 500 m / min.

In a KDF of the patent applicant, a filter tow is first withdrawn from a filter towbale and then subjected to several process steps. Among other things, the filter tow is widened, stretched, and sprayed with a plasticizer during processing, before being formed into a round section strand in a formatting device. Beforehand, the filter tow is placed in a continuous wrapping paper strip withdrawn from a reel, which has an adhesive seam made of a hot glue on one side. The wrapping paper strip is completely wrapped around the filter strand in the formatting device with the adhesive seam of the wrapping paper placed on the opposite side of the wrapping paper so that the wrapping paper is closed in a ring around the filter strand.

A corresponding hot glue is liquid when applied to the wrapping paper strip and has a temperature of about 180 ° C. It must be cooled down so that it solidifies and creates a safe bond of the wrapper strip. This purpose is served by a cooling bar in the format device, which is arranged on an upper format or a lower format of the format device. The cooling of the adhesive seam by means of a cooling web is part of the so-called "process cooling", wherein a process cooling, the cooling of a material flow, ie a tobacco rod or a filter strand, or other movable or immovable parts of the machine is understood, in contrast to the cooling, for example, an electronic control system.

Usually, a cooling web of such a format is cooled by means of a separate recooling device for process cooling. A separate recooling unit for process cooling in a single-line machine such as the KDF, which simultaneously processes only one strand, has a power consumption of a few kW (kilowatts). It is arranged in a separate structural unit or in a structural unit in the machine and cools the cooling webs of the format device via a coolant circuit with a flow line of a return line. The coolant has, for example, a temperature of 6 ° C and a flow of 6 l / min at a pressure of 2 bar.

The integration of the coolant circuit before the external recooler to the cooling bar is complex and the required cooling capacity of the external recooler is relatively high. A temperature control with an external recooler is only very limited and possible because of the flow velocity of the coolant in the cooling circuit only with a large time delay.

The development of machines of the tobacco processing industry, in particular the development of filter rod machines, is going to develop double strand machines, d. H. Extrusion machines that produce two filter or tobacco strands simultaneously and in parallel. For twin-strand machines, two cooling bridges must be cooled. If an external recooler is used for the process cooling, this means that the required cooling capacity would double.

The present invention is therefore an object of the invention to provide a cooling of a format for a machine of the tobacco processing industry, in particular for a filter rod machine, which requires no separate recooler, consumes less energy, flexibly controllable and small-sized, simple and built can be retrofitted.

This object is achieved by a cooling device for a format of a machine of the tobacco-processing industry, in particular a filter rod machine, wherein the cooling device comprises at least one cooling web and at least one heat sink, which is integrally formed with the at least one cooling web or with the at least one cooling web thermally conductive is connected or connectable, which is further developed in that the cooling device at least one Peltier Includes element, by means of which the heat sink is coolable.

The basic idea of the invention is that by means of Peltier elements, a very small-sized and energetically favorable possibility to be operated with electric current is provided for cooling cooling webs. Peltier elements are based on the Peltier effect that with certain conductors or semiconductors, a flow of an electrical current leads to heating of an electrical contact of the element and to a cooling of the other electrical contact. It is therefore spoken of a warm side or hot side and a cold side of the Peltier element. With commercially available Peltier elements, temperature differences of 50 ° C and more up to 70 ° C or 80 ° C can be achieved between the cold side and the hot side. A single Peltier element can achieve cooling or heating powers of 80 W or more.

In view of the external recooler used so far, however, it is surprising that a format of a machine of the tobacco processing industry, in particular a filter rod machine can be cooled by means of Peltier elements, since such a cooling performance can not be provided by Peltier elements or dimensioned accordingly Peltier elements are not available in a correspondingly small design.

With the present invention, it is possible to reliably operate a filter rod machine with a single refrigeration cycle system. A separate cooling circuit for cooling the format of conventional machines can thus be dispensed with. Optionally required coolant can then be removed from the single cooling circuit and used for cooling the Peltier elements.

Since Peltier elements are relatively small in size, they can also be installed in close proximity to the format device or in the format device, in particular existing machines or filter rod machines can be retrofitted with such Peltier elements as cooling. Since the Peltier elements are installed in the machine or filter rod machine, only electrical lines are to be laid and for the waste heat possibly coolant connections to the machine system, but not consuming to insulate coolant lines to separate cooling units. In addition, since the Peltier elements can be arranged or arranged very close to the cooling webs to be cooled, the waste heat losses are also severely limited by heating surrounding components of the machine.

The cooling device according to the invention thus has the advantages that no separate external recooler and no long cooling lines to separate cooling units are necessary. It can be installed as a compact unit.

In an advantageous variant, the cooling device comprises a coolant circuit with a pump which thermally connects a cold side of the Peltier element with the heat sink. Thus, on the cold side of such a Peltier element, a separate small-scale coolant circuit can be used, including a coolant pump. This variant is particularly advantageous for retrofitting existing machines of the tobacco-processing industry, in particular of existing filter rod machines, since the cooling webs already cooled with a larger cooling liquid circuit only have to be connected to another, smaller cooling liquid circuit. Since the length of the coolant lines can be kept very short, the thermal losses during transport of the coolant are low. Also, due to the small volume of the coolant circuit, a control of the temperature of the cooling web can be done much faster than before with an external recooler.

In an alternative advantageous embodiment of the invention, the heat sink is connected or connectable to a cold side of the Peltier element directly or via a metallic thermal conductor. In this case, the thermal conduction is carried out by a thermal contact without coolant, so that a very efficient and rapid transmission of thermal energy, d. H. Heat, takes place. Thus, thermal losses are severely limited and reaction times for the control of the temperature to be set of the cooling bar greatly shortened compared to a use with a coolant circuit. In addition, the elimination of a coolant circuit also eliminates the risk of leakage from which coolant exits. Such coolant leaks can render produced filter rods batch-wise unusable and thus lead to undesirable losses.

In particular, if a cooling web has an extension in the direction of a filter strand or another strand of material which is greater than the longitudinal extent of a Peltier element, it is preferably provided that a plurality of Peltier elements are arranged in a row and / or offset one behind the other. In this way, a cooling bar along its entire length is coolable. The staggered arrangement or alternate arrangement results in a higher power density of the cooling along the length of the cooling land.

In order to achieve an efficient dissipation of waste heat and a stable temperature setting of the cooling web, it is preferably provided that a warm side of the at least one Peltier element for dissipating waste heat is connected or connectable to a cooling water circuit of a machine of the tobacco-processing industry. Most machines of the tobacco processing industry, in particular filter strand machines and cigarette rod machines have a cooling water circuit, wherein cooling water is used with a temperature of about 20 ° C to transport the waste heat of the entire machine. The water cooling of the Peltier elements can be replaced or supplemented by air cooling or convection cooling.

The heat capacity of the cooling water system of a corresponding machine of the tobacco processing industry is so great that the cooling water for the Peltier elements means a large thermal mass. Therefore, the warm side of the Peltier element adopts the temperature of the cooling water when properly exchanged with the cooling water. Thus, the temperature of the cold side of the Peltier element as a differential temperature to the cooling water temperature is very precise and stable adjustable.

Since the cooling bar must be cooled to a temperature of about 6 ° C to 15 ° C to solidify the hot glue, little energy or power is required to cool the cold side compared to the tempered at cooling water temperature hot side to this value ,

Additionally or alternatively, a warm side of the at least one Peltier element for dissipating waste heat is advantageously connected or connectable to a cooling pipe which carries cooling air. The heated air is then optionally used elsewhere for heating. The heat removal can also passively convective carried out with a suitable coolant or a cooling liquid. In this embodiment, therefore, a second cooling circuit is present, but without a separate recooler. This solution provides a lower necessary overhead and a lower coolant flow compared to a cooling circuit with a recooler.

A particularly good heat conduction and low heat losses are preferably achieved when the heat sink and the cooling web have a common abutment surface, wherein at the abutting surface the surface of the heat sink is complementary to the surface of the cooling web, wherein in particular the abutment surface in cross-section a straight, V-shaped, forms dovetailed, curved or irregular line.

Preferably, the heat sink and the cooling bar are screwed together. Due to the rigidity of the material and the length of the cooling web, which is approx. 750 mm for the applicant's KDF, the areal closure along the abutment surfaces is approx. 75% for a screw connection with several screws. In this case, the heat sink and cooling web are at least partially made of copper and / or a good heat-conducting ceramic material.

Due to the shape of the abutment surfaces, which may be V-shaped, dovetail-shaped or similar in cross-section, the abutment surface is increased overall, so that a proportion of 75% of the abutment surface, in which the contact is flush, leads to a better heat transfer or transfer the thermal energy leads. In addition, a, for example, dovetailed, abutting surface is advantageous because with such a geometry of the abutting surfaces a positive connection between the heat sink and the cooling bar is achieved. The positive connection can also be supplemented by a force fit if the dimensions of the interlocking structures of the dovetail structure are selected accordingly. In such a case, a screw can be omitted or provided as an additional backup.

A particularly easy to use solution is that the at least one Peltier element and the at least one heat sink are combined in a structural unit of a block, with which the cooling web is connected to form a flat support or is connectable. The two-dimensional support preferably takes place along a previously described abutment surface. Such a unit or a block, also called "thermoblock" is particularly easy to install and manufacture.

The object of the invention is also based on a method for operating a machine of the tobacco-processing industry, in particular a filter rod machine, wherein a filter strand is wrapped with a wrapping paper strip, which is provided at an adhesive seam with a glue, in particular a hot glue, wherein the wrapped Filter strand is conveyed through a format device having an upper format and / or a sub-format with a cooling web for the adhesive seam, solved, which is further developed in that the cooling web is cooled by means of at least one Peltier element. This method has the same advantages as the aforementioned cooling device according to the invention.

If a temperature profile along the cooling web is set by means of several Peltier elements, which increases or decreases in particular in a conveying direction of the filter strand, the temperature profile can be advantageously adapted to the optimization of the cooling process for the adhesive seam. Thus, an initially very strong cooling effect a strong solidification of the bond, wherein the Filter strand underneath because of the short residence time at this point is not affected by the very low temperature. In the subsequent section of the cooling web, lower cooling is provided by subsequent Peltier elements, so that further solidification of the bond seam is continued at a lower cooling rate, but despite the longer residence time in this section, the underlying filter strand is not exposed to a very low temperature , Conversely, it is also possible to start with gentle cooling, which is reinforced towards the end.

An advantageous development of the method according to the invention is that, in particular in the absence of a filter strand in the format device, by reversing a polarity of a supply voltage of the Peltier element of the cooling bar is at least temporarily heated. The cold chill bar forms in the otherwise warm machine of the tobacco processing industry a condensation point for the existing humidity in the machine, so that the cooling bar tends to attract condensation moisture, especially if after completion of the production of a filter strand and passing through a filter strand z. B. is stopped. In this case, condensation may drip off the chute and cause short circuits, contamination or other negative effects.

A momentary reversal in the polarity of the supply voltage or the supply current for the Peltier element causes the cold side to become the hot side and vice versa. The now after the reversal of polarity hot side has a corresponding high temperature at which the condensation evaporates very quickly and can not accumulate so much that it can drip down. The heating can happen very quickly with Peltier elements, so that a short heating time to a temperature of 40 ° C is already sufficient to remove condensation moisture.

Finally, the object underlying the invention is also achieved by using at least one Peltier element in a machine of the tobacco-processing industry, in particular a filter rod machine, for cooling and / or heating a cooling web of a format device. This use according to the invention offers the same advantages which have already been mentioned for the cooling device according to the invention and for the method according to the invention.

The invention will be described below without limiting the general inventive idea by means of embodiments with reference to the drawings, reference being expressly made to the drawings with respect to all in the text unspecified details of the invention. Show it:

1 a schematic representation of a format cooling of a filter rod machine according to the prior art,

2 a schematic representation of an embodiment of a format cooling according to the invention a filter rod machine,

3 a schematic cross-sectional view through a format cooling according to 2 .

4 a schematic representation of another embodiment of a format cooling according to the invention a filter rod machine,

5 a schematic cross-sectional view through a format cooling of a strand according to 4 and

6a ) to 6f ) Several embodiments of a cross section through a format cooling according to 5 ,

In the following figures, identical or similar elements or corresponding parts are provided with the same reference numerals, so that a corresponding renewed idea is dispensed with.

1 shows a schematic representation of a top format cooling of a double-stranded filter rod machine of the tobacco processing industry according to the prior art. According to this prior art, an external cooling unit 1 with a recooling device 2 used in known filter rod machines, such as the KDF Applicant, absorbs a power of a few kW and provides cooling liquid at a temperature of 6 ° C with a flow of 6 l / min at a pressure of 2 bar.

The coolant is via a flow line 3 via a distributor 5 in a structural unit 9 introduced the format device and continued there in several flow lines. It is in the filter attachment according to 1 around a double-strand machine, so that belonging to the respective formatting device heat sink 6 . 6 ' , Cooling bars 7 . 7 ' and strands 8th . 8th' are doubled. For clarity, the two modules are not side by side or behind each other, but shown one below the other. In one possible embodiment of a machine, however, the two strands are arranged in one plane and the two heat sinks are respectively assigned to the two strands. The bridges run like the strands parallel to each other in two horizontal tracks.

Every heat sink 6 . 6 ' of the first strand 8th and the second strand 8th' is supplied with its own coolant line and cooled. The cooling bars 7 . 7 ' each have a thermal connection with the heat sink 6 . 6 ' so that the cooling bars 7 . 7 ' have a temperature of about 6 ° C to 15 ° C and hot melt in the filter strands 8th . 8th' cool down and solidify.

By the absorbed heat from the strands 8th . 8th' the coolant heats up. This becomes a second distributor via coolant lines 5 ' led and there in a common return line 4 summarized and the recooling device 2 promoted. So that the coolant circuit is closed.

For a double-strand machine, for example, the KDF-M of the applicant, the cooling capacity must be adjusted accordingly, since the hot glue of a seam of two strands must be cooled.

In 2 a first embodiment of a format cooling according to the invention is shown schematically. It is also a two-line machine, the format elements, namely heat sink 6 . 6 ' , Cooling bars 7 . 7 ' and strands 8th . 8th' in the assembly 21 the format cooling are the same as according to the prior art 1 , These are also shown above each other for reasons of clarity.

Central component of the embodiment according to 2 is the cooler 22 which comprises one or more Peltier elements, of which in 2 a Peltier element 23 . 23 ' is shown. The Peltier element includes a cold side 23 and a hot side 23 ' , With the hot side 23 ' is the Peltier element on stubs 12 . 13 a cooling water circuit with a flow line 10 and a return line 11 connected, the large volume dissipates heat from the machine. The temperature of the cooling water is usually about 20 ° C in the flow.

With the cooling water in the stubs 12 . 13 is the thermally a comparatively small mass performing Peltier element or the radiator 22 set to a constant temperature base and waste heat can be dissipated via the cooling water. The Peltier element 23 . 23 ' creates a temperature difference between the warm side 23 ' , which has the temperature of the cooling water, and the cold side 23 , The temperature difference is by controlling the electrical power consumption of the Peltier element 23 . 23 ' variably adjustable.

The cold side 23 of the Peltier element is connected to a cooling fluid circuit that is completely within the assembly 21 the format cooling is included and thus has only a very small mass to be moved. The cooling circuit consists of a flow line 24 with a pump 25 for the coolant, with the flow line 24 in a distributor 27 is divided into several flow lines, so that the heat sink 6 . 6 ' of two format devices for two strands 8th . 8th' can be cooled.

In the heat sink 6 . 6 ' The coolant heats up due to the absorption of heat from the strands 8th . 8th' over the cooling bars 7 . 7 ' , The heated cooling liquid is returned via return lines and in a second manifold 27 in a return line 26 of the cooling circuit to the cold side 23 returned to the Peltier element, where the cooling liquid is cooled down again to a cooling liquid temperature. The heat absorbed is transferred through the warm side into the cooling water through the stub line 13 to the return line 11 the cooling water discharged.

The in the format cooling according to 2 required electrical energy to operate the Peltier element 23 . 23 ' is much smaller than that according to the prior art according to 1 required cooling capacity of the external recooler 2 , This is because the coolant lines are much shorter than in the prior art and thus significantly fewer losses occur by radiation of thermal energy from the coolant lines. The short cooling liquid lines also do not have to be fed into the machine, for example a filter rod machine, and led out again, so that the volume of the machine groups and machine elements with which the cooling liquid lines come into contact are significantly smaller than in the prior art. Thus, less mass of the machine is to be considered as a cold sink according to the invention.

In 3 is a format cooling largely according to 2 shown schematically in cross section. In cross-section it can be seen that it is a two-strand machine with two strands 8th . 8th' is. stubs 12 and 13 to a flow line, not shown 10 and a return line, not shown 11 of cooling water lead into the module 21 the cooling device 20 into it and hit a cooling water chamber 28 , the direct contact with the warm side 23 ' a Peltier element has. By means of the cooling water chamber 28 finds a thermal exchange between the warm side 23 ' of the Peltier element and the cooling water instead.

The Peltier element has a cold side 23 on top of that with another coolant chamber 29 is connected and an exchange of thermal energy between the cold side 23 of the Peltier element and the cooling liquid. From this cooling fluid chamber 29 , which acts as a heat exchanger, performs a flow line 24 with a pump 25 the cooling circuit to a distributor 27 who on the in the case of the 3 common heat sink 6 the two cooling bars 7 . 7 ' seated. The distributor 27 serves in this case to introduce the cooling liquid into the heat sink 6 , Through the distributor 27 the cooling liquid is again through a return line 26 to the cooling liquid chamber 29 recycled, where the intermediate heated coolant is cooled again to operating temperature.

4 shows a schematic representation of another embodiment of a format cooling according to the invention. As in 2 is a Peltier element 23 . 23 ' with his warm side 23 over stubs 12 . 13 connected to a cooling water circuit of the machine, which represents a large compared to the cooling device according to the invention thermal mass and thus provides a temperature reference point.

In contrast to the embodiment according to 2 exists within the cooling device 40 according to 4 no cooling circuit, but a Peltier element 23 . 23 ' is in a cooler 42 built in, which makes direct thermal contact with heat sinks 43 . 44 a first strand 8th and heat sinks 43 ' . 44 ' a second strand 8th' having. These heat sinks in turn have a direct thermal contact with a respective cooling web 45 . 45 ' of the first strand 8th or the second strand 8th' the double-strand machine. As a heat sink 43 to 44 ' are preferably good heat conductors such as copper blocks provided. These may be laterally insulated to allow heat radiation to the side, from the strands 8th . 8th' to suppress.

If instead of a Peltier element several Peltier elements in the direction of the strands 8th . 8th' are arranged one behind the other and are separately controllable, it is possible a varying temperature profile along the cooling webs 45 . 45 ' adjust. The Peltier elements can be controlled very quickly, so that it is possible to regulate the temperature very quickly and constantly when measuring the cold stack temperature. It is also possible, very quickly with a reversal of the polarity of the supply voltage of the Peltier elements, the cooling webs 45 . 45 ' to heat and remove unwanted condensation in this way.

In 4 are in reality juxtaposed heat sink 43 . 44 and the cooling bridge 45 of the first strand 8th and the corresponding elements 43 ' to 45 ' of the second strand 8th' shown one below the other. In fact, the elements are touching 8th . 43 to 45 on the one hand and 8th' . 43 ' to 45 ' on the other hand, not, but are arranged side by side. This is the convention 2 complied with, in which also the juxtaposed assemblies of the heat sink and cooling bars of the two strands for the sake of clarity are shown below each other. The actual geometric distribution is similar to in 3 shown.

In 5 is a cross section through a format cooling according to the invention according to the second embodiment according to 4 , but for a strand 8th represented. The cooling device 40 has a central component of a Peltier element 23 . 23 ' on, with his warm side 23 ' with a cooler 42 connected, which is a cooling water chamber 47 so that cooling water in the cooling water chamber 47 thermally good conductive contact with the hot side 23 ' of the Peltier element has. The cold side 23 The Peltier element is equipped with a cooling block 48 , which is a first, directly contacted heat sink connected. This cooling block 48 is preferably made of copper or a similar good heat conducting material. To the cooling block 48 closes a cooling bar 45 on, which is also made of copper or a good heat conductive material.

The cooling bridge 45 has a surface thermal contact with the cooling block 48 at a common edge 49 , in the 5 is shown in a design with a flat surface. At the opposite end, the cooling bridge 45 a circular section-shaped recess, which is in radius with the radius of the strand 8th , in particular filter strand 8th , essentially matches. The contact point of the cooling bridge 45 with the filter strand 8th lies in the place of an adhesive seam 50 of the wrapping paper of the filter strand 8th consisting of a hot glue which is cooled to solidify and to join the overlapping edges of the wrapping strip.

Laterally, the assembly is by means of two insulation 46 . 46 ' insulated against heat radiation, so that the cooling power of the Peltier element 23 . 23 ' for the most part in the cooling of the glue seam 50 of the filter strand 8th flows.

Preferably, the Peltier element 23 . 23 ' together with the radiator 42 and the heat sink 48 manufactured as a block or block-shaped unit, wherein the individual parts are interconnected. The cooler 42 is, however, opposite the heat sink 48 thermally insulated. Such, also referred to as "thermoblock" unit can be installed with little effort, even in existing filter rod machines. The cabling is kept within limits, since only electrical cables are to be laid, and a Connection to the cooling water circuit of the machine. Furthermore, this construction variant is very space-saving and compact.

Such assemblies can also be adapted to different requirements, for example, different cooling bars, and be connected to them. This allows a flexible combination of thermoblocks of different capacity and different length with cooling bars or other components to be cooled a machine of the tobacco processing industry, in particular filter rod machine.

In 6 are schematically several variants of a single-strand format cooling according to 5 shown in cross section. The variants in the 6a ) to 6f ) differ in the shape of the abutting edge 49 between the cooling block 48 and the cooling bridge 45 , When screwed from a cooling bar 45 with a cooling block 48 , for example, both are made of copper and have a usual length of 750 mm, results in a surface closure of about 75%. On the remaining area of 25%, where no dense contacting takes place, a gap forms with an air layer that acts as an insulator, so that a transport of thermal energy at this point is strongly suppressed.

In order to increase the area on which a surface closure occurs, it is therefore provided according to the invention, the total area of the abutment surface 49 to increase. This happens according to 6a ) by a V-shaped abutment surface 49I in which the increase in the area of the abutment surface 49 goes hand in hand with an automatic centering of the cooling web 45 on the cooling block 48 , This can be done according to 6b ) also with a "W" -shaped edge 49II happen.

In 6c ) is a dovetailed edge 49III shown in addition to an increase in the area of the abutting edge 49III has the further advantage that a positive connection between the cooling web 45 and the cooling block 48 arises. In this respect, the cooling bridge 45 how to be plugged onto a self-holding rail, so that a further attachment, such as a screw, at least partially eliminated. The cooling bridge 45 However, it is to be secured against displacement in the longitudinal direction of a strand.

According to 6d ), the abutting edge may also be a curved curved abutting edge 49IV be educated. This sharp edges are avoided, which can lead to a high radiation of heat radiation and a high loss of heat energy, if no direct contact between the cooling bar at the edges 45 and the cooling block 48 consists,

The variants in 6e ) and 6f ) show a version of accumulated dovetails and a "V" shaped butt edge 49V or a version of a joint edge 49VI which forms complementary interlocking cooling fins.

The abutting edges according to 6c ) 6e ) and 6f ) have interlocking structures, which ensure that the cooling web 45 on the corresponding complementary structures of the cooling block 48 must be postponed in strand direction. In these cases, the structures of the abutting edges 49III . 49V and 49VI be dimensioned so that in addition to a positive connection and a frictional connection between the cooling block 48 and the cooling bridge 45 occurs. This is achieved, for example, in that the male structures, which engage in the female structures of the complementary side, are dimensioned slightly larger than the corresponding female structures.

Due to the frictional connection, the surfaces are pressed against each other, so that a surface closure of significantly more than 75% is achieved, so that the thermal conduction is optimized, in a way that with a screwing at a shock edge like the abutting edge 49 in 5 is unreachable.

All mentioned features, including the drawings alone to be taken as well as individual features that are disclosed in combination with other features are considered alone and in combination as essential to the invention. Embodiments of the invention may be accomplished by individual features or a combination of several features.

LIST OF REFERENCE NUMBERS

1

External cooling unit

2

Cooling device

3

Flow line

4

Return conduit

5, 5 '

distributor

6, 6 '

heatsink

7, 7 '

cool bar

8th

front strand

8th'

back strand

9

Unit of the format

10

Flow line of the cooling water

11

Return line of the cooling water

12

Stub line from the supply line

13

Stub line to the return line

20

cooler

21

Assembly of format cooling

22

cooler

23

Peltier element, cold side

23 '

Peltier element, warm side

24

Flow line of the cooling circuit

25

pump

26

Return line of the cooling circuit

27, 27 '

distributor

28

Cooling water chamber

29

Coolant chamber

40

cooler

41

Assembly of format cooling

42

cooler

43-44 '

heatsink

45, 45 '

cool bar

46, 46 '

insulation

47

Cooling water chamber

48

cooling block

49

abutting face

49 ^I - 49 ^VI

abutting surfaces

50

adhesive seam

Claims (13)

Cooling device ( 20 . 40 ) for a format of a filter rod machine of the tobacco processing industry, in particular a filter rod machine, wherein the cooling device ( 20 . 40 ) at least one cooling bridge ( 7 . 7 ' . 45 . 45 ' ) and at least one heat sink ( 6 . 6 ' . 43 . 43 ' . 44 . 44 ' ), which is integral with the at least one cooling web ( 7 . 7 ' . 45 . 45 ' ) is formed or with the at least one cooling web ( 7 . 7 ' . 45 . 45 ' ) is thermally conductively connected or connectable, characterized in that the cooling device ( 20 . 40 ) at least one Peltier element ( 23 . 23 ' ), by means of which the heat sink ( 6 . 6 ' . 43 . 43 ' . 44 . 44 ' ) is coolable. Cooling device ( 20 . 40 ) according to claim 1, characterized in that the cooling device ( 20 . 40 ) a coolant circuit ( 24 . 26 ) with a pump ( 25 ) for cooling liquid comprising a cold side of the Peltier element ( 23 ) with the heat sink ( 6 . 6 ' . 43 . 43 ' . 44 . 44 ' ) connects thermally. Cooling device ( 20 . 40 ) according to claim 1, characterized in that the heat sink ( 6 . 6 . 43 . 43 ' . 44 . 44 ' ) with a cold side of the Peltier element ( 23 ) is connected directly or via a metallic thermal conductor or is connectable. Cooling device ( 20 . 40 ) according to one of claims 1 to 3, characterized in that several Peltier elements ( 23 . 23 ' ) are arranged in a row and / or offset one behind the other. Cooling device ( 20 . 40 ) according to one of claims 1 to 4, characterized in that a warm side of the at least one Peltier element ( 23 ' ) for the removal of waste heat with a cooling water circuit ( 10 . 11 ) is connected to a machine of the tobacco processing industry or is connectable. Cooling device ( 20 . 40 ) according to one of claims 1 to 5, characterized in that a warm side of the at least one Peltier element ( 23 ' ) is connected to the removal of waste heat with a cooling air leading cooling pipe and / or with a passively convective cooling circuit or is connectable. Cooling device ( 20 . 40 ) according to one of claims 1 to 6, characterized in that the heat sink ( 6 . 6 ' . 43 . 43 ' . 44 . 44 ' ) and the cooling bridge ( 7 . 7 ' . 45 . 45 ' ) a common abutment surface ( 49 . 49I - 49VI ), wherein at the abutting surface ( 49 . 49I - 49VI ) the surface of the heat sink ( 6 . 6 ' . 43 . 43 ' . 44 . 44 ' ) complementary to the surface of the cooling web ( 7 . 7 ' . 45 . 45 ' ), in particular the impact surface ( 49 . 49I - 49VI ) forms in cross-section a straight, V-shaped, dovetailed, curved or irregular line. Cooling device ( 20 . 40 ) according to one of claims 1 to 7, characterized in that the at least one Peltier element ( 23 . 23 ' ) and the at least one heat sink ( 6 . 6 ' . 43 . 43 ' . 44 . 44 ' ) are combined in a unit of a block, with the cooling web ( 7 . 7 ' . 45 . 45 ' ) is connected to form a flat support or is connectable. Machine of the tobacco processing industry, in particular filter rod machine, with a cooling device ( 20 . 40 ) according to one of claims 1 to 8. Method for operating a machine of the tobacco processing industry, in particular a filter rod machine, wherein a filter rod ( 8th . 8th' ) is wrapped with a wrapping paper strip which is attached to an adhesive seam ( 50 ) is provided with a glue, in particular a hot glue, wherein the wrapped filter strand ( 8th . 8th' ) is conveyed through a format device which has an upper format and / or a lower format with a cooling web ( 7 . 7 ' . 45 . 45 ' ) for the adhesive seam ( 50 ), characterized in that the cooling web ( 7 . 7 ' . 45 . 45 ' ) by means of at least one Peltier element ( 23 . 23 ' ) is cooled. Method according to claim 10, characterized in that by means of several Peltier elements ( 23 . 23 ' ) a temperature profile along the cooling web ( 7 . 7 ' . 45 . 45 ' ) is set, in particular in a conveying direction of the filter strand ( 8th . 8th' ) increases continuously and / or in sections, decreases and / or remains constant. A method according to claim 10 or 11, characterized in that, in particular in the absence of a filter strand ( 8th . 8th' ) in the format device, by reversing a polarity of a supply voltage of the Peltier element ( 23 . 23 ' ) the cooling bridge ( 7 . 7 ' . 45 . 45 ' ) is heated at least temporarily. Use of at least one Peltier element ( 23 . 23 ' ) in a machine of the tobacco processing industry, in particular a filter rod machine, for cooling and / or heating a cooling web ( 7 . 7 ' . 45 . 45 ' ) of a format device.

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