A water-blocking tape sample production device

Abstract

The application relates to the field of water-blocking tape production equipment, in particular to a water-blocking tape sample production device which comprises a unwinding machine, a glue spraying machine, a compound machine and a winding machine arranged in sequence, a material roll is rotationally arranged on the unwinding machine, a compound roller is rotationally arranged on the compound machine, a compound tape is wound on the compound roller, the base tape unwound from the material roll is compounded with the compound tape and then wound on the winding machine, a material spraying box with an internal hollow structure and an open top is arranged between the glue spraying machine and the compound machine, an internal hollow drying box is arranged between the compound machine and the winding machine, a feeding slot and a discharging slot are arranged in the open top end of the material spraying box, a cover is vertically slidably arranged on the top of the material spraying box, a lifting piece for driving the vertical sliding of the cover is arranged on the material spraying box, a material spraying assembly is arranged on the cover, a drying inlet and a drying outlet are arranged on the drying box, an observation door is hinged to the drying box, and an electric heating plate electrically connected to a control system is arranged in the drying box. The application has the effects of reducing the sample production difficulty and cost.

Description

Technical Field

[0001] This application relates to the field of water-blocking tape production equipment, and in particular to a water-blocking tape sample production apparatus. Background Technology

[0002] Cable water-blocking tape is a waterproof material used for cables or optical cables. It is mainly composed of water-absorbing material and fiber fabric (base tape). It absorbs water and expands to block the water penetration channels, preventing water intrusion that may cause short circuits, corrosion or signal attenuation, and ensuring electrical insulation performance and signal transmission stability.

[0003] Due to the ever-changing market conditions and usage demands, customers often require the design and development of new water-blocking tape products under various requirements. To ensure the stability of the performance of newly developed water-blocking tape products, it is necessary to produce samples corresponding to the new products. However, most of the existing water-blocking tape production equipment is a formal production line. Since the required sample length is usually short and the debugging process of formal production lines is relatively complex, using formal production lines to produce samples will greatly increase the R&D cost of new water-blocking tapes, which is a drawback. Utility Model Content

[0004] In order to improve the problems existing in the production of samples of new water-blocking tape using formal production lines, this application provides a water-blocking tape sample production device.

[0005] The water-blocking tape sample production device provided in this application adopts the following technical solution: A sample production apparatus for water-blocking tape includes an unwinding machine, a glue spraying machine, a laminating machine, and a winding machine arranged sequentially. A material roll is rotatably mounted on the unwinding machine. A laminating roller is rotatably mounted on the laminating machine, and a composite tape is wound around the laminating roller. The base tape unwound from the material roll is laminated with the composite tape and then wound back onto the winding machine. A hollow, open-top spraying box is arranged between the glue spraying machine and the laminating machine. A hollow drying box is arranged between the laminating machine and the winding machine. The top of the spray box has an open feed trough and a discharge trough. A cover is vertically slidable on the top of the spray box. A lifting device is provided on the spray box to drive the cover to slide vertically. A spraying assembly is provided on the cover. The spraying assembly is used to spray water-absorbing material onto the base belt between the spray box and the cover. The drying box has a drying inlet and a drying outlet. An observation door is hinged on the drying box. An electric heating plate electrically connected to the control system is provided inside the drying box.

[0006] By adopting the above technical solution, the base tape unwound from the unwinding machine is sprayed with glue by the glue spraying machine and then slides into the inside of the spray box. The spraying component on the cover sprays water-absorbing material onto the glue on the base tape. After that, the laminating machine laminates a layer of composite tape onto the upper surface of the base tape. Subsequently, the laminated base tape and composite tape are dried by heating the electric heating plate in the drying oven. Finally, the dried base tape and composite tape are wound onto the winding machine. Through the various functions of the miniaturized formal production line, the production needs of samples are met, which not only ensures the production quality of samples, but also eliminates the need to occupy the formal production line, thereby solving the problems existing in the production of samples.

[0007] Optionally, the lifting component includes multiple fixing blocks disposed on the spray box, the multiple fixing blocks being symmetrically distributed on both sides of the spray box, a guide post being vertically slidably disposed on the fixing block, the guide post being disposed on the cover, a lifting cylinder electrically connected to the control system being disposed on the spray box, and the cover being disposed on the piston rod of the lifting cylinder.

[0008] By adopting the above technical solution, the control system starts the lifting cylinder, the piston rod of the lifting cylinder extends, and under the guidance of the guide column, the piston rod of the lifting cylinder pushes the cover to rise, thereby making it convenient for workers to pass the base belt through the feed trough and the discharge trough.

[0009] Optionally, the spraying assembly includes a hopper disposed on the cover. The hopper is hollow inside and open at both ends vertically. The bottom of the hopper is connected to the top of the spraying box. A sealing plate is hinged to the top of the hopper. A fixing plate is disposed at the open bottom end of the hopper. A shaking plate is horizontally slidably disposed at the bottom of the hopper. The lower surface of the shaking plate is in contact with the upper surface of the fixing plate. Both the shaking plate and the fixing plate are vertically provided with a plurality of spraying holes. The spraying holes on the shaking plate can be completely offset from the spraying holes on the fixing plate. A dispensing component is disposed on the hopper to drive the shaking plate to slide back and forth.

[0010] By adopting the above technical solution, workers place the newly developed water-absorbing material in the hopper. As the base belt passes through the spray box, the spreading component drives the shaking plate to slide horizontally back and forth, so that the spray holes on the shaking plate and the spray holes on the fixed plate repeatedly stagger and connect, so that the water-absorbing material in the hopper continuously falls onto the glue on the surface of the base belt, thereby completing the spraying process of the water-absorbing material.

[0011] Optionally, both ends of the material shaking plate extend to the outside of the hopper in the sliding direction. The material spreading component includes a material shaking motor disposed on the hopper and located above one end of the material shaking plate. The material shaking motor is electrically connected to the control system. A cam is disposed on the output shaft of the material shaking motor. An impact plate is disposed on the material shaking plate. The cam is used to strike the impact plate. A pressure plate is disposed on the end of the material shaking plate facing away from the impact plate. A reset spring is provided between the pressure plate and the hopper.

[0012] By adopting the above technical solution, the control system starts the shaking motor. The output shaft of the shaking motor drives the cam to rotate. During the rotation of the cam, the cam will strike and push the impact plate. The impact plate will drive the shaking plate to slide. The reset spring, through continuous compression and recovery of deformation, enables the shaking plate to slide back and forth continuously. At the same time, the shaking plate can vibrate continuously during the sliding process, so that the water-absorbing material in the hopper can be evenly sprayed onto the base belt. This device is simple and can meet the needs of sample production. It does not require the complex spraying equipment on the formal production line, which greatly reduces the research and development cost.

[0013] Optionally, a support roller is rotatably mounted on the spray box, and a flat roller is rotatably mounted on the cover. The base tape unwound from the material roll passes between the support roller and the flat roller.

[0014] By adopting the above technical solution, the water-absorbing material sprayed on the base belt is pressed onto the adhesive on the base belt by the flat roller. On the other hand, the flat roller flattens the unevenly piled water-absorbing material, which is beneficial to improving the subsequent bonding effect with the composite belt.

[0015] Optionally, the feed inlet and discharge outlet of the spray box are both provided with inclined extension plates, which are inclined toward the spray box from top to bottom, and are located below the base strip unwound from the material roll.

[0016] By adopting the above technical solution, the extension plate can effectively reduce the possibility of water-absorbing material sprayed in the spray box spreading outside the box, which helps to reduce pollution to the production environment.

[0017] Optionally, the bottom of the spray box may be detachably equipped with a collection box that is hollow inside and open at the top.

[0018] By adopting the above technical solution, the difficulty of collecting and processing the water-absorbing material in the spray box is reduced.

[0019] Optionally, the drying box has a support roller rotatably installed at both the drying inlet and the drying outlet. Two tensioning frames are vertically slidably installed on the drying box, each corresponding to one of the support rollers. A tensioning roller is rotatably installed on the tensioning frame and is located directly above the support roller. A baffle is installed on the drying box and above the tensioning frame, and a tensioning spring supports the baffle and the tensioning frame.

[0020] By adopting the above technical solution, the composite base tape is kept taut in the drying oven under the action of the tension spring, which is beneficial to improving the drying efficiency of the base tape. At the same time, the base tape will shrink during the drying process, and the tension spring can adapt to the drying shrinkage process of the base tape through deformation, which is beneficial to improving the quality of the produced water-blocking tape samples.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. The base tape unwound from the unwinding machine is sprayed with adhesive by the glue sprayer and then slides into the spray box. The spraying component on the cover sprays absorbent material onto the adhesive on the base tape. Then, the laminating machine laminates a layer of composite tape onto the upper surface of the base tape. Subsequently, the laminated base tape and composite tape are dried by heating the electric heating plate in the drying oven. Finally, the dried base tape and composite tape are wound onto the winding machine. Through the various functions of the miniature formal production line, the production needs of samples are met, which not only ensures the production quality of samples, but also does not require the use of a formal production line, thus solving the problems that exist when producing samples. 2. The control system starts the shaking motor. The output shaft of the shaking motor drives the cam to rotate. During the rotation of the cam, the cam will strike and push the impact plate. The impact plate will drive the shaking plate to slide. The reset spring, through continuous compression and recovery deformation, enables the shaking plate to slide back and forth continuously. At the same time, the shaking plate can vibrate continuously during the sliding process, so that the water-absorbing material in the hopper can be evenly sprayed onto the base belt. This device is simple and can meet the needs of sample production. It does not require the complex spraying equipment on the formal production line, which greatly reduces the research and development cost. 3. Under the action of the tension spring, the composite base tape is kept in a taut state in the drying oven, which is beneficial to improving the drying efficiency of the base tape. At the same time, the base tape will shrink during the drying process, and the tension spring can adapt to the drying shrinkage process of the base tape through deformation, which is beneficial to improving the quality of the produced water-blocking tape samples. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0023] Figure 2This is a structural diagram illustrating the positional relationship between the fixed block, the lifting cylinder, and the shaking motor in the embodiments of this application.

[0024] Figure 3 This is a cross-sectional view used in the embodiments of this application to illustrate the positional relationship between the fixed plate, the shaking plate, and the flat roller.

[0025] Figure 4 This is a cross-sectional view used in the embodiments of this application to illustrate the positional relationship between the electric heating plate, the tension roller, and the support roller.

[0026] Explanation of reference numerals in the attached drawings: 1. Unwinder; 2. Glue sprayer; 3. Laminating machine; 4. Rewinder; 5. Material roll; 6. Laminating roller; 7. Laminating belt; 8. Spraying box; 9. Drying box; 10. Feed chute; 11. Discharge chute; 12. Cover; 13. Lifting component; 131. Fixing block; 132. Guide column; 133. Lifting cylinder; 14. Spraying assembly; 141. Hopper; 142. Sealing plate; 143. Fixing plate; 144. Shaking plate; 45. Spray nozzle; 15. Drying inlet; 16. Drying outlet; 17. Observation door; 18. Electric heating plate; 19. Spreading component; 191. Shaking motor; 192. Cam; 193. Impact plate; 194. Pressure plate; 195. Reset spring; 20. Support roller; 21. Flat roller; 22. Extension plate; 23. Collection box; 24. Belt roller; 25. Tensioning frame; 26. Tensioning roller; 27. Baffle; 28. Tensioning spring; 29. ​​Observation window. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0028] This application discloses an apparatus for producing water-blocking tape samples.

[0029] Reference Figure 1 A water-blocking tape sample production device includes an unwinding machine 1, a glue spraying machine 2, a laminating machine 3, and a winding machine 4 arranged in sequence. A material roll 5 is rotatably connected to the unwinding machine 1. The material roll 5 is formed by winding a base tape. A laminating machine 3 is rotatably connected to a laminating roller 6. A laminating roller 6 is wound with a laminating tape 7. The base tape unwound from the material roll 5 is laminated with the laminating tape 7 and then wound onto the winding machine 4.

[0030] Reference Figure 1 , Figure 2 and Figure 3 A spray box 8 is arranged between the glue spraying machine 2 and the laminating machine 3. The spray box 8 is hollow inside and open at the top. The open end of the top of the spray box 8 is provided with a feed slot 10 and a discharge slot 11. Inclined extension plates 22 are welded to both the feed slot 10 and the discharge slot 11 of the spray box 8. The extension plates 22 are inclined towards the spray box 8 in a downward direction. The extension plates 22 are located below the base tape unwound from the material roll 5.

[0031] Reference Figure 1 , Figure 2 and Figure 3 The bottom of the spray box 8 is bolted with a collection box 23 that is hollow inside and open at the top. A cover 12 is vertically slidably arranged on the top of the spray box 8. A lifting component 13 is arranged on the spray box 8 to drive the cover 12 to slide vertically.

[0032] Reference Figure 2 The lifting component 13 includes multiple fixing blocks 131 welded to the spray box 8. The multiple fixing blocks 131 are symmetrically distributed on both sides of the spray box 8. A guide post 132 is vertically slidably arranged on the fixing block 131. The top of the guide post 132 is welded to the cover 12. A lifting cylinder 133 electrically connected to the control system is bolted to the spray box 8. The axis of the guide post 132 is parallel to the axis of the piston rod of the lifting cylinder 133. The cover 12 is bolted to the piston rod of the lifting cylinder 133.

[0033] The worker first pulls the base tape and composite tape 7 unwound from the material roll 5 onto the winding machine 4. Then, the control system starts the lifting cylinder 133. The piston rod of the lifting cylinder 133 retracts, and the piston rod of the lifting cylinder 133 drives the cover 12 to slowly cover the top of the spray box 8.

[0034] Reference Figure 2 and Figure 3 A spraying assembly 14 is arranged on the cover 12. The spraying assembly 14 is used to spray water-absorbing material onto the baseband between the spraying box 8 and the cover 12.

[0035] Reference Figure 3 The spraying assembly 14 includes a hopper 141 welded to the cover 12. The hopper 141 is hollow inside and open at both ends vertically. The bottom of the hopper 141 is connected to the top of the spraying box 8. A sealing plate 142 is hinged to the top of the hopper 141 and fixed to the hopper 141 by a buckle. A fixing plate 143 is welded to the open end of the bottom of the hopper 141.

[0036] Reference Figure 2 and Figure 3 The fixing plate 143 completely blocks the bottom open end of the hopper 141. The spray box 8 is rotatably connected to the support roller 20, and the cover 12 is rotatably connected to the flat roller 21. The flat roller 21 is located directly above the support roller 20. The base strip unwound from the material roll 5 passes between the support roller 20 and the flat roller 21.

[0037] Reference Figure 2 and Figure 3A material shaking plate 144 is horizontally slidably arranged at the bottom of the material bin 141. Both ends of the material shaking plate 144 in the sliding direction extend to the outside of the material bin 141. The lower surface of the material shaking plate 144 contacts the upper surface of the fixed plate 143. Several spray holes 145 are vertically opened on both the material shaking plate 144 and the fixed plate 143.

[0038] Reference Figure 2 and Figure 3 The spray hole 145 on the shaking plate 144 is located in the middle of the shaking plate 144. The spray hole 145 on the shaking plate 144 can be completely offset from the spray hole 145 on the fixed plate 143. The material bin 141 is provided with a spreading component 19 that drives the shaking plate 144 to slide back and forth.

[0039] Reference Figure 2 The material spreading component 19 includes a material shaking motor 191 that is bolted to the outer wall of the material bin 141 and located above one end of the material shaking plate 144. The material shaking motor 191 is electrically connected to the control system. A cam 192 is bolted to the output shaft of the material shaking motor 191. An impact plate 193 is welded to one end of the material shaking plate 144. The cam 192 is used to strike the impact plate 193.

[0040] Workers load the newly developed absorbent material into the hopper 141. During the winding process of the winding machine 4, the glue sprayer 2 sprays glue onto the base belt. As the glue-sprayed base belt moves from the feed chute 10 of the spray box 8 to the discharge chute 11, the control system starts the shaking motor 191. The output shaft of the shaking motor 191 drives the cam 192 to rotate.

[0041] During the rotation of cam 192, cam 192 will strike and push impact plate 193 to slide. Impact plate 193 drives shaking plate 144 to move synchronously. Meanwhile, the reset spring 195 continuously compresses and restores its deformation, enabling shaking plate 144 to slide back and forth continuously. At the same time, the vibration generated by the impact of impact plate 193 will cause shaking plate 144 to vibrate continuously during the sliding process.

[0042] As the spray holes 145 on the shaking plate 144 and the spray holes 145 on the fixed plate 143 repeatedly stagger and connect, the water-absorbing material in the hopper 141 can be evenly sprayed onto the base belt. Under the action of the flat roller 21 and the support roller 20, the water-absorbing material sprayed onto the base belt is pressed and flattened. The composite belt 7 unwound from the composite roller 6 will be combined with the base belt that slides out from the discharge slot 11 of the spray box 8.

[0043] Reference Figure 1 , Figure 2 and Figure 4A pressure plate 194 is welded to one end of the shaking plate 144 facing away from the impact plate 193. A reset spring 195 is provided between the pressure plate 194 and the hopper 141. A hollow drying box 9 is arranged between the laminating machine 3 and the winding machine 4. A drying inlet 15 and a drying outlet 16 are provided on the drying box 9. A support roller 24 is rotatably connected to both the drying inlet 15 and the drying outlet 16 of the drying box 9.

[0044] Reference Figure 4 Two tensioning frames 25 are vertically slidably arranged on the drying box 9. The tensioning frames 25 correspond one-to-one with the support rollers 24. Tensioning rollers 26 are rotatably connected to the tensioning frames 25. The tensioning rollers 26 are located directly above the support rollers 24. A baffle 27 is welded on the drying box 9 and above the tensioning frames 25. A tensioning spring 28 supports the baffle 27 and the tensioning frames 25.

[0045] Reference Figure 1 and Figure 4 The drying oven 9 is hinged with an observation door 17, and a transparent observation window 29 is arranged on the observation door 17. An electric heating plate 18, which is electrically connected to the control system, is bolted inside the drying oven 9. The electric heating plate 18 can be a ceramic electric heating plate 18 in the prior art. The electric heating plate 18 is located on both vertical sides of the base belt.

[0046] After lamination, the composite belt 7 and the base belt pass between the tension roller 26 and the support roller 24, and slide between two electric heating plates 18. During this process, the electric heating plates 18 heat and dry the adhesive between the composite belt 7 and the base belt. The water-blocking belt formed after drying will be wound on the winding machine 4.

[0047] The implementation principle of the water-blocking tape sample production device in this application embodiment is as follows: the worker first pulls the base tape and composite tape 7 unwound from the material roll 5 to the winding machine 4. Then, the control system starts the lifting cylinder 133. The piston rod of the lifting cylinder 133 retracts, and the piston rod of the lifting cylinder 133 drives the cover 12 to slowly cover the top of the spray box 8.

[0048] Workers load the newly developed absorbent material into the hopper 141. During the winding process of the winding machine 4, the glue sprayer 2 sprays glue onto the base belt. As the glue-sprayed base belt moves from the feed chute 10 of the spray box 8 to the discharge chute 11, the control system starts the shaking motor 191. The output shaft of the shaking motor 191 drives the cam 192 to rotate.

[0049] During the rotation of cam 192, cam 192 will strike and push impact plate 193 to slide. Impact plate 193 drives shaking plate 144 to move synchronously. Meanwhile, the reset spring 195 continuously compresses and restores its deformation, enabling shaking plate 144 to slide back and forth continuously. At the same time, the vibration generated by the impact of impact plate 193 will cause shaking plate 144 to vibrate continuously during the sliding process.

[0050] As the spray holes 145 on the shaking plate 144 and the spray holes 145 on the fixed plate 143 repeatedly stagger and connect, the water-absorbing material in the hopper 141 can be evenly sprayed onto the base belt. Under the action of the flat roller 21 and the support roller 20, the water-absorbing material sprayed onto the base belt is pressed and flattened. The composite belt 7 unwound from the composite roller 6 will be combined with the base belt that slides out from the discharge slot 11 of the spray box 8.

[0051] After lamination, the composite belt 7 and the base belt pass between the tension roller 26 and the support roller 24, and slide between two electric heating plates 18. During this process, the electric heating plates 18 heat and dry the adhesive between the composite belt 7 and the base belt. The water-blocking belt formed after drying will be wound on the winding machine 4.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sample production apparatus for water-blocking tape, comprising an unwinding machine (1), a glue spraying machine (2), a laminating machine (3), and a winding machine (4) arranged sequentially, wherein a material roll (5) is rotatably mounted on the unwinding machine (1), a laminating roller (6) is rotatably mounted on the laminating machine (3), a composite tape (7) is wound on the laminating roller (6), and the base tape unwound from the material roll (5) is laminated with the composite tape (7) and then wound onto the winding machine (4), characterized in that: A hollow, open-top spray box (8) is arranged between the glue spraying machine (2) and the laminating machine (3). A hollow drying box (9) is arranged between the laminating machine (3) and the winding machine (4). The open-top end of the spray box (8) has a feed inlet (10) and a discharge outlet (11). A cover (12) is vertically slidable on the top of the spray box (8). A device is provided on the spray box (8) to drive the cover (12) vertically. The sliding lifting component (13) is provided with a spraying assembly (14) on the cover (12). The spraying assembly (14) is used to spray water-absorbing material onto the base belt between the spraying box (8) and the cover (12). The drying box (9) is provided with a drying inlet (15) and a drying outlet (16). The drying box (9) is hinged with an observation door (17). The drying box (9) is provided with an electric heating plate (18) that is electrically connected to the control system.

2. The water-blocking tape sample production device according to claim 1, characterized in that: The lifting component (13) includes multiple fixing blocks (131) disposed on the spray box (8). The multiple fixing blocks (131) are symmetrically distributed on both sides of the spray box (8). A guide post (132) is vertically slidably disposed on the fixing block (131). The guide post (132) is disposed on the cover (12). A lifting cylinder (133) electrically connected to the control system is disposed on the spray box (8). The cover (12) is disposed on the piston rod of the lifting cylinder (133).

3. The water-blocking tape sample production device according to claim 1, characterized in that: The spraying assembly (14) includes a hopper (141) disposed on the cover (12). The hopper (141) is hollow inside and open at both ends vertically. The bottom of the hopper (141) is connected to the top of the spraying box (8). A sealing plate (142) is hinged to the top of the hopper (141). A fixing plate (143) is provided at the open end of the bottom of the hopper (141). A shaking plate (144) is horizontally slidably disposed at the bottom of the hopper (141). The lower surface of the shaking plate (144) is in contact with the upper surface of the fixed plate (143). Both the shaking plate (144) and the fixed plate (143) are provided with a plurality of spray holes (145) in a vertical direction. The spray holes (145) on the shaking plate (144) can be completely offset from the spray holes (145) on the fixed plate (143). The hopper (141) is provided with a spreading component (19) that drives the shaking plate (144) to slide back and forth.

4. The water-blocking tape sample production device according to claim 3, characterized in that: Both ends of the material shaking plate (144) in the sliding direction extend to the outside of the hopper (141). The material spreading component (19) includes a material shaking motor (191) disposed on the hopper (141) and located above one end of the material shaking plate (144). The material shaking motor (191) is electrically connected to the control system. A cam (192) is disposed on the output shaft of the material shaking motor (191). An impact plate (193) is disposed on the material shaking plate (144). The cam (192) is used to strike the impact plate (193). A pressure plate (194) is disposed on one end of the material shaking plate (144) facing away from the impact plate (193). A reset spring (195) is supported between the pressure plate (194) and the hopper (141).

5. The water-blocking tape sample production device according to claim 4, characterized in that: A support roller (20) is rotatably mounted on the spray box (8), and a flat roller (21) is rotatably mounted on the cover (12). The base strip unwound from the material roll (5) passes between the support roller (20) and the flat roller (21).

6. The water-blocking tape sample production device according to claim 3, characterized in that: Inclined extension plates (22) are provided at the feed inlet (10) and the discharge inlet (11) of the spray box (8). The extension plates (22) are inclined toward the spray box (8) in a downward direction. The extension plates (22) are located below the base strip unwound on the material roll (5).

7. The water-blocking tape sample production device according to claim 4, characterized in that: The bottom of the spray box (8) is detachably equipped with a collection box (23) that is hollow inside and open at the top.

8. The water-blocking tape sample production device according to claim 1, characterized in that: The drying box (9) is provided with a support roller (24) at both the drying inlet (15) and the drying outlet (16). Two tensioning frames (25) are vertically slidably arranged on the drying box (9). The tensioning frame (25) corresponds one-to-one with the support roller (24). A tensioning roller (26) is rotatably arranged on the tensioning frame (25). The tensioning roller (26) is located directly above the support roller (24). A baffle (27) is provided on the drying box (9) and above the tensioning frame (25). A tensioning spring (28) is supported between the baffle (27) and the tensioning frame (25).

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