Method for producing a godet shell, a godet shell and a device for vacuuming a predetermined number of blind holes of a godet shell

Abstract

The present disclosure relates to a method for producing a godet casing (1) for transporting, drawing and / or tempering synthetic threads, wherein the godet casing (1) can be heated by means of a heating device that can be arranged on the inner side (2) of the godet casing (1), wherein a predetermined number of blind bores (3) are introduced into the godet casing (1), wherein the number of blind bores (3) are each filled with a heat distribution fluid (4), and wherein the number of blind bores (3) are closed with a closure element (5). The present disclosure further relates to a godet casing (1) for transporting, drawing and / or tempering synthetic threads. The present disclosure further relates to a device for vacuuming a predetermined number of blind bores (3) of a godet casing (1).

Description

[0001] The present invention relates to a method for producing a godet casing for transporting, drawing and / or tempering synthetic threads, a godet casing for transporting, drawing and / or tempering synthetic threads and a device for vacuuming a predetermined number of blind bores of a godet casing.

[0002] Such godet sleeves can be heated by means of a heating device arranged on the inside of the godet sleeve, in particular to enable the desired temperature control of the threads. Various heating devices, for example inductive ones, are used for this. The godet sleeves are rotated during operation in order to be able to transport the threads. During their transport, the threads are guided in contact with an outer circumference of the godet sleeve by means of the godet sleeve. For example, the threads are drawn between two adjacent godet sleeves. The threads can also be drawn out of a spinneret for extrusion by means of a godet sleeve and drawn in the process. The contact of the threads with the godet sleeve heats the threads, in particular bringing them to a temperature required for drawing. The heating of the threads can also serve to relax them.

[0003] CN 103108424 A discloses an inductively heatable roller body, for example, for synthetic threads. Within the peripheral wall of the roller body, several sealed envelope chambers extend in the longitudinal direction / in the direction of the central axis of the roller body. In the circumferential direction, the chambers are evenly spaced from one another. Both gas and liquid can be arranged within the envelope chambers. The ends of the envelope chambers are connected to one another by an annular channel and are thus in fluid communication with one another.

[0004] Such roller bodies are complex to manufacture, especially the annular channel. Furthermore, filling the envelope chambers and the annular channel with gas or liquid is difficult due to the complex geometries and the resulting pressure losses and / or turbulence.

[0005] EP 3 288 339 B1 discloses an induction heating roller for synthetic threads comprising a spool and a roller main body. The roller main body has an outer cylindrical (goalette) casing that encloses the spool. A heat equalizing element is arranged between the spool and the casing, in contact with the casing. In an axial direction, the thermal conductivity of the heat equalizing element is higher than the thermal conductivity of the casing. The heat equalizing element is hollow-cylindrical, and its entire outer circumference rests against the inner circumference of the casing.

[0006] To ensure that the heat-adjusting element fits snugly against the inner circumference of the casing, stringent requirements regarding the dimensional accuracy / tolerances of the heat-adjusting element and the casing must be met. Without the heat-adjusting element fitting snugly against the inner circumference of the casing, sufficiently good heat transfer between the heat-adjusting element and the casing cannot be achieved.

[0007] DE 10 2020 007 761 A1 describes a godet for guiding threads. The godet comprises a rotatably driven guide sleeve, i.e., a godet sleeve, a heating device for heating the guide sleeve, and a temperature sensor for directly or indirectly measuring the temperature of the guide sleeve. The temperature sensor is arranged within a sleeve volume defined by the guide sleeve. The guide sleeve has a heat pipe filled with a working medium for heat distribution. The temperature sensor is arranged within the heat pipe.

[0008] This presents the problem of inserting the heat pipe into a corresponding recess in the guide casing. Here, too, appropriate tolerances must be maintained to ensure good heat transfer between the heat pipe and the guide casing. Furthermore, the recess for accommodating the heat pipe must be made sufficiently large, which weakens the stability of the guide casing.

[0009] EP 0 589 685 A2 shows a heating roller with a built-in motor. In the heating roller, a heating coil is fixedly mounted on a surface of a motor outer housing. A motor rotor shaft of the motor is connected to a heating roller rotating shaft of a heating roller rotor, which is designed to cover the heating coil. The heating roller rotor thus acts like a godet shell. Heat pipes are provided in the hot roller rotor. The heat pipes are arranged, for example, in longitudinal grooves cut into the inner circumference of the hot roller rotor and glued there using a synthetic material. The heat pipes could also be arranged in longitudinal, cylindrical bores of the hot roller rotor.

[0010] Here, too, the problem arises of inserting the heat pipes into the corresponding recesses of the godet shell, referred to here as the hot roller rotor. Without the appropriate high-quality tolerances, good heat transfer between the heat pipes and the guide shell cannot be achieved. Furthermore, the recesses for accommodating the heat pipes must be designed to be correspondingly large, which weakens the stability of the guide shell. This weakening is particularly significant when the recesses in the hot roller rotor are designed as grooves rather than bores.

[0011] The present invention is based on the object of providing a method for producing a godet shell, a godet shell, and a device for vacuuming a predetermined number of blind holes in a godet shell, which reduce or eliminate the problems of the prior art. In particular, the method should be particularly simple and easy to implement. Furthermore, the godet shell should be highly stable and allow for particularly uniform temperature control.

[0012] This object is firstly achieved by a method for producing a godet shell according to claim 1.

[0013] Further advantageous embodiments are the subject of the subclaims.

[0014] More precisely, the object is firstly achieved by a method for producing a godet casing for transporting, drawing and / or tempering synthetic threads, wherein the godet casing can be heated by means of a heating device which can be arranged on the inside of the godet casing, wherein a predetermined number of blind bores are introduced into the godet casing, wherein the number of blind bores are each filled with a heat distribution fluid, and wherein the number of blind bores are closed with a closure element.

[0015] Water is primarily used as the heat distribution fluid, although depending on the pressure and temperature, a water / steam mixture may also be present in the blind holes during operation of the godet shell. The use of a different type of heat distribution fluid, such as glycol, is also conceivable. The process for manufacturing the godet shell is simple and requires little effort. Only a few easy-to-perform steps are required to create, fill, and close the blind holes. In particular, identical process steps are carried out for each blind hole, which further simplifies the process.

[0016] According to an advantageous embodiment of the method, after vacuuming the number of blind holes, the number of blind holes is sealed fluid-tight with a positive and / or non-positive closure element.

[0017] This ensures that the heat distribution fluid does not escape from the blind holes during operation of the godet shell. Impairment of heat distribution along the godet shell by the heat distribution fluid due to an indeterminate, particularly insufficient, amount of heat distribution fluid in the corresponding blind hole is thus successfully avoided. For fluid-tight sealing or closing, a seal is preferably positioned between the corresponding closure element and the godet shell in the area of ​​the respective blind hole.

[0018] Further preferably, a predetermined number of blind bores are closed with a common closure element, on which a sealing region is formed per blind bore, or each of the blind bores is closed with a respective closure element.

[0019] If the predetermined number of blind holes is sealed with a common closure element, assembly is simplified because two or more blind holes can be sealed fluid-tight simultaneously. Advantageously, only one tool is required for this.

[0020] As an alternative to a common closure element, preferably at least two of the closure elements, in particular all closure elements, could also be connected to a connecting element, e.g. a band or ring, and / or formed on the connecting element.

[0021] The godet shell preferably has a substantially hollow cylindrical wall into which the blind holes are formed. The blind holes are preferably formed into the godet shell using a drilling process. Theoretically, it would also be conceivable to produce the godet shell and the blind holes in a single casting process, with corresponding casting cores being provided for the blind holes. Under certain circumstances, the blind holes could be reworked after the casting process, e.g., using an awl.

[0022] Advantageously, during the vacuuming of the blind holes, the air present in the respective blind hole is sucked out and / or the heat distribution fluid present in the respective blind hole is at least partially evaporated.

[0023] By extracting the air, a particularly good distribution of heat is possible by means of the heat distribution fluid during operation of the godet shell, since this heat distribution fluid has a higher thermal conductivity coefficient than air.

[0024] The at least partial evaporation of the heat distribution fluid present in the respective blind bore can be achieved by reducing the pressure in the respective blind bore. Preferably, the pressure in the blind bores is reduced until a certain ratio of liquid heat distribution fluid to pure vapor of the heat distribution fluid is reached. In particular, nucleate boiling, i.e., the heat distribution fluid begins to boil, is avoided when the pressure is reduced. The reduction of the pressure in the blind bores can also be stopped before the heat distribution fluid transitions into the gas phase. Particularly preferably, the reduction of the pressure in the blind bores is stopped at the point at which the evaporation of the heat distribution fluid just begins.

[0025] According to a further embodiment of the method, the blind holes are drilled longitudinally into the godet shell. The axes of the blind holes are then essentially parallel to the godet shell's rotational axis. This facilitates the drilling of the blind holes. For example, clamping or supporting the godet shell during a drilling process is particularly easy. The resulting blind holes and the associated closure element thus do not interfere with the thread guidance or heating of the godet shell during operation.

[0026] The blind holes are advantageously placed at equal distances from one another in the godet shell. This allows for particularly even heat distribution across the entire thread-guiding surface of the godet shell during operation. Furthermore, imbalances during the godet shell's rotation are successfully avoided.

[0027] It may be advantageous if the godet shell has an outer end face with a cover region that delimits the interior of the godet shell at this outer end face. The godet shell has a holding side. A bearing element for receiving at least one rotary bearing for the godet shell can be moved from the holding side into the interior of the godet shell. The blind bores are preferably formed at least partially from the holding side into the godet shell.

[0028] According to a further embodiment of the method, the blind holes are introduced into the godet shell at least partially from the outer end face.

[0029] Preferably, however, the blind holes are only made from one of the two end faces of the godet shell in order to simplify the insertion process.

[0030] The object underlying the invention is also achieved by a godet casing according to claim 8.

[0031] More precisely, the object is achieved by a godet sleeve for transporting, drawing and / or tempering synthetic threads of a winding device for winding the synthetic thread, which godet sleeve is produced in particular by means of a method as described above, wherein the godet sleeve can be heated by means of a heating device that can be arranged on the inside of the godet sleeve, wherein a predetermined number of blind bores are introduced into the godet sleeve, wherein the number of blind bores are each filled with a heat distribution fluid, and wherein the number of blind bores are closed with a closure element. Due to the blind bores being closed with the closure element, the godet sleeve is, on the one hand, highly stable and, on the other hand, the godet sleeve can be particularly uniformly tempered. All areas of the godet sleeve thus serve either to ensure its stability or to distribute the heat.In particular, the separate heat pipes known from the prior art for accommodating the heat distribution fluid weaken the stability of the godet shell and / or lead to poorer heat distribution. For example, with the same wall thickness of the godet shell, such separate heat pipes only provide a space of smaller diameter for the heat distribution fluid.

[0032] Advantageously, each of the blind holes is sealed with a closure element. This reduces the design and manufacturing effort, as a similar closure element can be used for each blind hole.

[0033] The closure elements are then preferably designed as screw plugs. After the blind holes have been filled with the heat distribution fluid, the screw plugs are screwed into an internal thread of the blind holes. The use of other closure elements and the corresponding closure of the blind holes is conceivable.

[0034] According to a further embodiment, the closure elements, preferably all closure elements, are designed as plugs that are inserted translationally in the direction of the blind bores, namely in particular as so-called expansion sealing plugs. Such translational assembly is particularly quick and easy to carry out.

[0035] Preferably, the blind bores are each completely filled with the heat distribution fluid, which is preferably under negative pressure compared to the environment. This further improves heat distribution. During operation of the godet shell, the heat distribution fluid flows, in particular as steam, from warmer areas within the blind bores to cooler areas of the blind bores, in order to then heat them, so that the temperature of the godet shell is evened out. The negative pressure present in the blind bores after the blind bores have been closed is selected in particular such that the heat distribution fluid is partly liquid and partly vaporous at the temperatures prevailing during operation of the godet shell.

[0036] In its operation, the godet sleeve is in particular part of a godet, wherein the godet has a heating device arranged on the inside of the godet sleeve for heating the godet sleeve, wherein the godet has the bearing element with a rotary bearing for bearing the godet sleeve, wherein the bearing element projects from the holding side into the interior of the godet sleeve, wherein the godet has a drive unit by means of which the godet sleeve can be rotated.

[0037] Such godets are used primarily in melt spinning machines for the production of partially or fully drawn synthetic yarns for textile or technical applications. At the end of the melt spinning process, the yarns are wound up using a winding machine. Several yarns, preferably guided in parallel by a godet casing, then exhibit particularly similar properties due to the even heat distribution within the casing.

[0038] The object underlying the invention is also achieved by a device for vacuuming a predetermined number of blind holes of a godet shell according to claim 11.

[0039] More precisely, the object is then achieved by a device for vacuuming a predetermined number of blind bores of a godet shell with a vacuum chamber in which a negative pressure can be generated by means of a vacuum pump connected to the vacuum chamber, wherein the godet shell can be arranged within the vacuum chamber for vacuuming the blind bores, wherein at least one tool, in particular a screwing tool and / or a punch, is arranged penetrating a wall of the vacuum chamber, so that the number of blind bores of the godet shell arranged within the vacuum chamber under vacuum can be closed with a closure element with the aid of the tool.

[0040] The godet shell can be arranged at least partially within the vacuum chamber for vacuuming the blind bores. The filling of the blind bores with the heat distribution fluid preferably takes place before the godet shell is arranged in the vacuum chamber. If only a part of the godet shell is arranged in the vacuum chamber, then the area of ​​at least one, preferably all, ends of the blind bores, where the closure element is to be arranged for closing, is arranged in the vacuum chamber. Because the at least one tool is arranged penetrating the wall of the vacuum chamber, the tool can be guided outside the vacuum chamber by an installer and the blind bores can be closed using the tool within the vacuum chamber using the at least one closure element.When the tool is arranged so that it penetrates the wall of the vacuum chamber, the tool is sealed accordingly against the wall so that the vacuum of the desired quality can be reliably achieved within the vacuum chamber.

[0041] Preferably, the wall of the vacuum chamber is partially formed by a preferably round lid. The vacuum chamber can be opened and closed again by means of the lid. The godet casing can be positioned within the vacuum chamber when the lid is open. The at least one tool is preferably arranged so as to penetrate the lid. When the godet casing is arranged within the vacuum chamber, the ends of the blind bores, on which the closure element is or will be arranged, are preferably aligned towards the lid or towards the opening in the vacuum chamber that then forms when the lid is open. The tool can then be positioned relative to the closure element at the same time by placing the lid on.

[0042] Further preferably, a tool is arranged for each of the blind bores, penetrating the wall of the vacuum chamber. This plurality of tools is then preferably arranged in a circular pattern.

[0043] In the following, preferred embodiments are presented in more detail with reference to the attached figures. Fig. 1 schematically shows a device for vacuuming a predetermined number of blind holes of a godet shell for carrying out part of the method for producing the godet shell in a three-dimensional external view. Fig. Figure 2 shows schematically the device for vacuuming the predetermined number of blind holes of the godet shell to carry out part of the process for producing the godet shell from Fig. 1 with the godet casing according to a first embodiment in a side view, partly in section. Fig. 3 shows schematically an enlarged section of Fig. 2 on a closure element. Fig. 4 shows schematically a contrast to Fig. 3 different closure element of a godet casing according to a second embodiment in a Fig. 3 analog view.

[0044] Fig. 1 to Fig. 4 each show a specific point in time during the process for producing a godet casing 1 for transporting, drawing, and / or tempering synthetic threads. The godet casing 1 can be heated by means of a heating device arranged on the inner side 2 of the godet casing 1. A predetermined number of blind holes 3 are introduced into the godet casing 1. The number of blind holes 3 are each filled with a heat distribution fluid 4. The number of blind holes 3 are closed with a closure element 5. In particular, Fig. 2 to Fig. 4 shows the situation shortly after the blind holes 3 have been closed with the closure element 5. Preferably, 45 to 55 blind holes 3, particularly preferably 48 to 52 blind holes 3, are introduced into the godet shell 1. The godet shell 1 is rotatable about a rotation axis D during operation. After vacuuming the number of blind holes 3, the number of blind holes 3 is sealed fluid-tight with a positive and / or non-positive closure element 5.

[0045] Each of the blind holes 3 is drilled according to the Fig. 1 to 4 are each closed with a closure element 5. Alternatively, a predetermined number of blind bores could be closed with a common closure element, on which a sealing area is formed for each blind bore.

[0046] The godet shell 1 has a substantially hollow cylindrical wall 6 into which the blind bores 3 are formed. The threads can be guided on an outer side of the godet shell 1 in the region of the hollow cylindrical wall 6. The hollow cylindrical wall 6 is arranged concentrically to the rotational axis D.

[0047] The blind holes 3 are formed in the longitudinal direction of the godet shell 1. The longitudinal direction refers to a direction in the direction of the rotation axis D or parallel to the rotation axis D. The blind holes 3 are formed in the godet shell 1 at equal distances from one another. The blind holes 3 preferably have the same depth.

[0048] The godet shell 1 has an outer end face 7 with a cover region 8, which delimits the interior space 9 of the godet shell 1 at this outer end face 7. The godet shell 1 has a holding side 10. A bearing element for receiving at least one rotary bearing for the godet shell 1 can be moved from the holding side 10 into the interior space 9 of the godet shell 1. The blind holes 3 are at least partially introduced into the godet shell 1 from the holding side 10. The cover region 8 is also formed, in particular, by means of a godet cover (not shown here). Such a godet cover is then mounted in the area of ​​the outer end face 7 during assembly of the godet shell 1 to a higher-level structural unit, namely a godet described in detail below. The blind holes could also be introduced into the godet shell at least partially from the outer end face.

[0049] According to Fig. 2 and Fig. 3, the closure elements 5 are each designed as screw plugs 11. Such screw plugs 11 are screwed into the blind bores 3 using a screwing tool 12, with the blind bores 3 each having an internal thread 13 in the region of their opening. In the assembled state, a screw plug seal 11.d, in particular a copper sealing ring, is arranged between the screw plug 11 and the godet casing 1.

[0050] According to Fig. 4, the closure elements 5 are each designed as expansion sealing plugs 14. Sleeves 15 of such expansion sealing plugs 14 are first inserted into the respective associated blind bore 3. This is easily achieved without great effort, since a fit between the sleeves 15 and the blind bore 3 is selected accordingly. After this insertion, no, if any, sealing is achieved. The desired high, fluid-tight seal is achieved by pressing an expansion element 16, in particular a ball, into the associated sleeve 15 by means of a punch 17. The resulting enlargement of the outer diameter of the respective sleeve 15 leads to a compression of the sleeve 15 in the associated blind bore 3 and thus to the desired high, fluid-tight seal.

[0051] After the blind bores 3 have been created, the blind bores 3 are initially partially filled with the heat distribution fluid 4, in particular water. Then, the one common closure element 5 or the multiple closure elements 5 are pre-assembled, wherein the sealing areas in the case of a common closure element 5 or the respective closure elements 5 in the case of one closure element 5 per blind bore 3 are arranged in the area of ​​the respective blind bore 3, but without achieving a significantly high sealing effect. Screw plugs 11, for example, are screwed in a few turns but without applying a significantly high torque. Or, when using expansion sealing plugs 14, spreading elements 16 of the expansion sealing plugs 14 are placed onto the already inserted sleeves 15 but not yet pressed in.

[0052] The godet shell 1 is then positioned in a device for vacuuming a predetermined number of blind bores 3 of the godet shell 1. The device for vacuuming the predetermined number of blind bores 3 of the godet shell 1 has a vacuum chamber 18 in which a negative pressure can be generated by means of a vacuum pump 21 connected to the vacuum chamber 18. The godet shell 1 can be arranged within the vacuum chamber 18 for vacuuming the blind bores 3. At least one tool 12, 17, in particular a screwing tool 12 and / or a punch 17, is arranged penetrating a wall of the vacuum chamber 18, so that the number of blind bores 3 of the godet shell 1 arranged within the vacuum chamber 18 can be closed with a closure element 5 using the tool 12, 17.

[0053] The wall of the vacuum chamber 18 is according to Fig. 1 to 4 is partially formed by a preferably round lid 19. The vacuum chamber 18 can be opened and closed again by means of the lid 19. The godet shell 1 can be positioned within the vacuum chamber 18 when the lid 19 is open. The at least one tool 12, 17 is arranged penetrating the lid 19.

[0054] For each of the blind holes 3, according to Fig. 1 to 4, a tool 12, 17 is arranged penetrating the wall of the vacuum chamber 18.

[0055] The godet shell 1, prepared as described above, is placed in the initially opened vacuum chamber 18, in particular with the pre-assembled closure element 5. The vacuum chamber 18 is then closed by placing the cover 19 on top. A cover seal 19.d, in particular at least one O-ring, is arranged between the cover 19 and the adjacent area of ​​the vacuum chamber 18 in the assembled state. A vacuum is then generated within the vacuum chamber 18 by means of a vacuum pump 21 connected to the vacuum chamber 18 by means of a vacuum pipe 20. A manometer 22 is preferably provided, by means of which the pressure within the vacuum chamber 18 is measured. The vacuum initially sucks out the air still present in the blind bores 3, which, for example,through the respective, still loose threaded connection between screw plug 11 and internal thread 13 or through the respective gap between sleeve 15 and blind bore 3 from the respective blind bore 3. The pressure within each blind bore 3 is reduced to such an extent that the heat distribution fluid 4 begins to evaporate at a certain pressure. The reduction in pressure within each blind bore 3 is preferably carried out until the air is completely sucked out and a certain, desired ratio of liquid and vaporous heat distribution fluid 4 is reached. However, it is also conceivable that a small proportion of air remains in the respective blind bores 3. Furthermore, the heat distribution fluid 4 could also be completely evaporated. The reduction in pressure within each blind bore 3 is carried out in particular until the heat distribution fluid 4 just begins to evaporate.

[0056] The reduction of the pressure in the respective blind bores 3 is completed when the pressure prevailing in the vacuum chamber 18 has been established in the respective blind bores 3. The blind bores 3 are then closed fluid-tight by means of the at least one closure element 5. The reduction of the pressure in the respective blind bores 3 can also be interrupted by the fluid-tight closure of the at least one closure element 5.

[0057] If the closure elements 5 are designed as screw plugs 11, a screwing tool 12 is arranged penetrating the cover 19 for each screw plug 11, whereby a connection required for screwing is created between each screw plug 11 and the associated screw tool 12 during and / or after the vacuum chamber 18 is closed by means of the cover 19. The screw plugs 11 are then tightened from outside the vacuum chamber 18 and without affecting the pressure within the vacuum chamber 18. A screw tool seal 12.d, in particular at least one O-ring, is arranged between the cover 19 and the screw tools 12. The screwing is carried out up to a certain torque at which the desired high sealing effect is achieved.

[0058] If the closure elements 5 are designed as expansion sealing plugs 14, a stamp 17 is arranged per expansion sealing plug 14 penetrating the cover 19, wherein during and / or after the vacuum chamber 18 is closed by means of the cover 19, the respective stamps 17 are first placed onto the expansion elements 16 resting on the sleeves 15. The expansion elements 16 are then pressed in from outside the vacuum chamber 18 and without affecting the pressure within the vacuum chamber 18. A stamp seal 17.d, in particular at least one O-ring, is arranged between the cover 19 and the stamps 17. The expansion elements 16 are pressed in until the respective expansion element 16 has reached the intended position at which the desired high sealing effect is achieved.

[0059] After all blind holes 3 have been closed fluid-tight by means of the closure element 5, the vacuum chamber 18 can be opened again and the godet shell 1 can be removed from the vacuum chamber 18.

[0060] Fig. 2 to Fig. 4 also show, in particular, the godet casing 1 for transporting, drawing, and / or tempering synthetic threads, which is produced in particular by means of the method described above. The godet casing 1 can be heated by means of a heating device arranged on the inner side 2 of the godet casing 1. A predetermined number of blind bores 3 are formed in the godet casing 1. The blind bores 3 are each filled with a heat distribution fluid 4. The blind bores 3 are each closed with a closure element 5, as shown here.

[0061] The blind bores 3 are each completely filled with the heat distribution fluid 4, which is preferably under negative pressure to the environment and which is here in particular partly in the liquid and partly in the vapor phase.

[0062] It is conceivable that a temperature sensor bore is arranged between two adjacent blind bores 3, in which at least one temperature sensor for measuring the temperature of the godet shell 1 can be arranged.

[0063] The godet sleeve 1 described above is, particularly during operation, part of a godet. The godet has the heating device arranged on the inner side 2 of the godet sleeve 1 for heating the godet sleeve 1. The godet has the bearing element with the rotary bearing for supporting the godet sleeve 1. The bearing element projects from the holding side 10 into the interior 9 of the godet sleeve 1. The godet has a drive unit by means of which the godet sleeve 1 can be rotated. The godet sleeve 1 and a drive shaft of the drive unit are connected to one another in a rotationally fixed manner for this purpose. The drive shaft is arranged so as to at least partially penetrate the godet sleeve 1 in the region of its rotational axis D.

[0064] The heating device is designed, for example, as an induction heating device. The heating device, in particular at least one coil of the heating device, is then arranged on an outer side of the bearing element, facing the inner side 2 of the godet shell 1. List of reference symbols 1 godet shell 2 Inside of the godet shell 1 3 blind holes 4 Heat distribution fluid 5 locking element 6 hollow cylindrical wall 7 Outer front side 8 Lid area 9 Interior 10 Holding side 11 screw plugs 11.d Screw plug seal 12 screwing tools 12.d Screw tool seal 13 internal threads 14 expansion sealing plugs 15 sleeve 16 Spreader element 17 stamps 17.d Stamp seal 18 Vacuum chamber 19 lids 19.d Lid seal 20 vacuum tube 21 Vacuum pump 22 pressure gauges D Rotation axis of the godet shell 1 QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 103108424 A

[0003] EP 3 288 339 B1

[0005] DE 10 2020 007 761 A1

[0007] EP 0 589 685 A2

[0009]

Claims

[1] Method for producing a godet casing (1) for transporting, drawing and / or tempering synthetic threads, wherein the godet casing (1) can be heated by means of a heating device which can be arranged on the inside (2) of the godet casing (1), wherein a predetermined number of blind bores (3) are introduced into the godet casing (1), wherein the number of blind bores (3) are each filled with a heat distribution fluid (4), and wherein the number of blind bores (3) are closed with a closure element (5). [2] Method according to claim 1, characterized by that after vacuuming the number of blind holes (3), the number of blind holes (3) is sealed fluid-tight with a positive and / or non-positive closure element (5). [3] Method according to claim 1 or 2, characterized bythat a predetermined number of blind bores (3) are closed with a common closure element (5), on which a sealing area is formed per blind bore (3), or each of the blind bores (3) is closed with a respective closure element (5). [4] Method according to at least one of the preceding claims, characterized by that the godet shell (1) has a substantially hollow cylindrical wall (6) into which the blind bores (3) are made. [5] Method according to at least one of the preceding claims 2 to 4, characterized by that during the vacuuming of the blind bores (3), the air present in the respective blind bore (3) is sucked out and / or the heat distribution fluid (4) present in the respective blind bore (3) is at least partially evaporated. [6] Method according to at least one of the preceding claims, characterized bythat the blind holes (3) are made in the longitudinal direction in the godet casing (1) and / or are made in the godet casing (1) at equal distances from one another. [7] Method according to at least one of the preceding claims, characterized by that the godet shell (1) has an outer end face (7) with a cover region (8) which delimits the interior space (9) of the godet shell (1) on this outer end face (7), wherein the godet shell (1) has a holding side (10), wherein a bearing element for receiving at least one rotary bearing for the godet shell (1) can be moved from the holding side (10) into the interior space (9) of the godet shell (1), wherein the blind bores (3) are at least partially introduced into the godet shell (1) from the holding side (10). [8] Godet casing (1) for transporting, drawing and / or tempering synthetic threads of a winding device for winding the synthetic thread, which is produced in particular by means of a method according to at least one of the preceding claims, wherein the godet casing (1) can be heated by means of a heating device which can be arranged on the inner side (2) of the godet casing (1), wherein a predetermined number of blind bores (3) are introduced into the godet casing (1), wherein the number of blind bores (3) are each filled with a heat distribution fluid (4), and wherein the number of blind bores (3) are closed with a closure element (5). [9] Godet casing (1) according to claim 8, characterized by that each of the blind bores (3) is closed with a respective closure element (5), wherein the closure elements (5) are designed as screw plugs (11) and / or as expansion sealing plugs (14). [10] Godet casing (1) according to claim 8 or 9, characterized by that the blind bores (3) are each completely filled with the heat distribution fluid (4), which is preferably under negative pressure to the environment. [11] Device for vacuuming a predetermined number of blind bores (3) of a godet casing (1), comprising a vacuum chamber (18) in which a negative pressure can be generated by means of a vacuum pump (21) connected to the vacuum chamber (18), wherein the godet casing (1) can be arranged within the vacuum chamber (18) for vacuuming the blind bores (3), wherein at least one tool (12, 17), in particular a screwing tool (12) and / or a punch (17), is arranged penetrating a wall of the vacuum chamber (18), so that the number of blind bores (3) of the godet casing (1) arranged within the vacuum chamber (18) under vacuum can be closed with a closure element (5) with the aid of the tool (12, 17). [12] Device according to claim 11, characterized by that the wall of the vacuum chamber (18) is partially formed by means of a preferably round lid (19), wherein the vacuum chamber (18) can be opened and closed again by means of the lid (19), wherein the godet casing (1) can be positioned within the vacuum chamber (18) when the lid (19) is open, wherein the at least one tool (12, 17) is arranged so as to penetrate the lid (19). [13] Device according to claim 11 or 12, characterized by that for each of the blind bores (3) a tool (12, 17) is arranged penetrating the wall of the vacuum chamber (18).

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