A chemical solution spraying apparatus for surface modification of polyethylene fibers

Abstract

The application discloses a kind of polyethylene fiber surface modification with chemical solution spraying equipment, including lifting rack and the controller being arranged in lifting rack, the side wall of the controller is electrically connected with motor, the upper wall of the motor is driven with driving rod by transmission assembly, the upper wall of the lifting rack is equipped with workbench, the upper end of the driving rod is set through workbench, the upper wall of the driving rod is fixed with spraying assembly, the side wall of the lifting rack is rotatably equipped with two winding rollers, transmission has fiber between two winding rollers, and fiber and spraying assembly correspond.The present application relates to the technical field of fiber modification;The polyethylene fiber surface modification with chemical solution spraying equipment, through intermittent treatment process, can guarantee the modification effect of fiber, while will not affect the continuous transmission process of fiber, ensure the continuity of chemical modification, also ensure that the surface of polyethylene fiber is evenly covered with chemical solution.

Description

Technical Field

[0001] This invention relates to the field of fiber modification technology, specifically to a chemical solution spraying device for surface modification of polyethylene fibers. Background Technology

[0002] Polyethylene fiber is a common synthetic fiber with good physical properties and chemical stability. To improve the performance of polyethylene fiber, surface modification can be performed; chemical solution spraying equipment is a device used to uniformly coat a material surface with a chemical solution, and this equipment is commonly used for surface modification of polyethylene fibers.

[0003] Using chemical solution spraying equipment for surface modification of polyethylene fibers may have some drawbacks, including: difficulty in controlling uniformity: During the spraying process, it is necessary to ensure that the chemical solution covers the surface of the polyethylene fibers evenly. However, due to the irregularity of the fiber surface, it is difficult to completely control the uniformity of the spraying, which may result in unsatisfactory coverage in some areas. Uneven deposition thickness: In actual operation, it is difficult to ensure that the chemical solution is deposited on the surface of polyethylene fibers with a completely uniform thickness. This may lead to differences in deposition thickness and affect the consistency of modification effect.

[0004] To address these issues, the present invention provides a chemical solution spraying device for surface modification of polyethylene fibers. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a chemical solution spraying device for surface modification of polyethylene fibers, thus solving the aforementioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a chemical solution spraying device for surface modification of polyethylene fibers, comprising a lifting platform and a controller disposed within the lifting platform. A motor is electrically connected to the side wall of the controller, and a drive rod is driven by a transmission assembly on the upper wall of the motor. A worktable is disposed on the upper wall of the lifting platform, and the upper end of the drive rod penetrates the worktable. A spraying assembly is fixedly disposed on the upper wall of the drive rod. Two take-up rollers are rotatably disposed on the side wall of the lifting platform, and fibers are transmitted between the two take-up rollers, with the fibers corresponding to the spraying assembly. A rotating rod is laterally rotatably disposed on the upper wall of the worktable, and the rotating rod and the drive rod transmit power to each other. An auxiliary mechanism is provided between one end of the rotating rod and the lifting platform, and the auxiliary mechanism includes a connecting assembly and a processing assembly. The connecting assembly includes a connecting rod rotatably disposed at one end of a rotating rod, a first magnet is provided on the side wall of the rotating rod, a second magnet is provided on the side wall of the connecting rod, the first magnet and the second magnet attract each other, a fixing plate is fixed on the upper side wall of the connecting rod, and a spring is connected between the fixing plate and the upper wall of the worktable. The processing assembly includes a telescopic frame fixedly mounted on the side wall of the connecting rod, a movable rod rotatably mounted at the end of the telescopic frame, a movable groove rotatably mounted on the side wall of the lifting platform, the movable rod extending and retracting within the movable groove, and a processing plate fixedly mounted on the side wall of the telescopic frame, the processing plate corresponding to the fiber. An air extraction assembly is also provided between the transmission assembly and the lower wall of the worktable.

[0007] The present invention further defines the technical solution as follows: Preferably, the transmission assembly includes a first rotating wheel driven by a motor, a second rotating wheel fixedly disposed on the side wall of the drive rod, and a transmission belt connecting the first rotating wheel and the second rotating wheel.

[0008] Preferably, the spraying assembly includes a spraying turntable fixed to the upper end of the drive rod, a fixing box fixed to the upper wall of the spraying turntable, and three spraying plates spaced at equal angles on the side wall of the spraying turntable. Each of the three spraying plates has a spraying hole on its lower wall, and the spraying holes are oriented towards the fiber.

[0009] Preferably, a second gearbox is provided on the side wall of the rotating rod, and a first gearbox is provided on the side wall of the driving rod. The rotating rod and the driving rod are connected by transmission through the second gearbox and the first gearbox.

[0010] Preferably, a guide rod is fixedly provided on the upper wall of the worktable, and the spring is wound around the guide rod.

[0011] Preferably, the air extraction assembly includes a driven wheel that is driven to the side wall of the transmission belt, a reciprocating screw fixed to the lower wall of the driven wheel, a movable plate matched to the side wall of the reciprocating screw, the movable plate and the lifting platform being connected by a linkage rod, and a lifting rod fixed to the upper wall of the other end of the linkage rod.

[0012] Preferably, the upper wall of the workbench is provided with multiple air intake holes, and the workbench is also provided with a moving cavity. The air intake holes and the moving cavity are interconnected. A pusher plate is horizontally sealed inside the moving cavity. A one-way ventilation valve is provided on the side wall of the pusher plate. A vent is also provided at the lower end of the moving cavity. The lower wall of the pusher plate and the lifting rod are fixed to each other.

[0013] Preferably, all air intake holes are located on the lower wall of the fiber, and the diameter of the air intake holes is set to 1 mm. Beneficial effects

[0014] This invention provides a chemical solution spraying device for surface modification of polyethylene fibers. Compared with the prior art, it has the following advantages: (1) The chemical solution spraying equipment for surface modification of polyethylene fiber is controlled by a controller to make the motor work. When the motor is running, the drive rod is driven to rotate through the first rotating wheel, the second rotating wheel and the transmission belt. When the drive rod rotates, the chemical solution stored in the fixed box is sprayed onto the fiber through the spraying hole by the spraying turntable. Through the three spraying holes that are equally spaced, the fiber surface can be sprayed while rotating at a uniform speed, achieving the effect of interval spraying. This ensures uniformity and allows for an adsorption and precipitation process between the solution and the fiber, thus ensuring the spraying effect.

[0015] (2) The chemical solution spraying equipment for surface modification of polyethylene fiber drives the driven wheel to rotate through the transmission belt. The moving plate moves up and down on the side wall of the reciprocating screw, thereby driving the pusher plate to move up and down in the moving cavity. When the moving cavity moves downward, suction force is generated in the suction hole, which adsorbs the fiber onto the upper wall of the worktable. The magnitude of the suction force in the suction hole can be controlled by the transmission ratio, making the fiber more stable when the solution is sprayed. It can also be used in conjunction with the leveling and uniform coating of the treatment plate to ensure the effect of chemical modification of the fiber.

[0016] (3) The chemical solution spraying equipment for surface modification of polyethylene fiber can drive the connecting rod to rotate synchronously through the first magnet and the second magnet. When the connecting rod rotates, the spring is gradually compressed. When the treatment plate and the surface of the fiber come into contact and the fiber is leveled, the spring is compressed to the extreme. Under the action of the spring elasticity, the first magnet and the second magnet separate from each other, so that the spring pushes the connecting rod to rotate in the opposite direction, thereby bringing the treatment plate to the original position. The first magnet and the second magnet are attracted together again to prepare for the next leveling and smoothing process. Through the intermittent treatment process, the modification effect of the fiber can be guaranteed, and the continuous transmission process of the fiber will not be affected. This ensures the continuity of chemical modification and also ensures that the chemical solution covers the surface of the polyethylene fiber evenly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a chemical solution spraying device for surface modification of polyethylene fibers proposed in this invention; Figure 2 yes Figure 1 Schematic diagram of the structure at point A; Figure 3 This is a schematic diagram of the overall structure of a chemical solution spraying device for surface modification of polyethylene fibers proposed in this invention from another angle. Figure 4This is a schematic diagram of the overall structure of a chemical solution spraying device for surface modification of polyethylene fibers proposed in this invention from another angle. Figure 5 This is a schematic diagram of the overall structure of a chemical solution spraying device for surface modification of polyethylene fibers proposed in this invention from another angle. Figure 6 yes Figure 5 Schematic diagram of the structure at point B; Figure 7 This is a schematic diagram of the air intake hole in a chemical solution spraying device for surface modification of polyethylene fibers proposed in this invention; Figure 8 This is a schematic diagram of the moving cavity in a chemical solution spraying device for surface modification of polyethylene fibers proposed in this invention; Figure 9 This is a schematic diagram of the structural explosion inside the moving cavity of a chemical solution spraying device for surface modification of polyethylene fibers proposed in this invention; Figure 10 This is a schematic diagram of the overall structure of a chemical solution spraying device for surface modification of polyethylene fibers proposed in this invention from another angle.

[0018] In the diagram: 1. Lifting platform; 2. Workbench; 3. Motor; 4. Spraying turntable; 5. Fixed box; 6. Spraying plate; 7. Rotating rod; 8. Fiber; 9. Telescopic frame; 10. Movable rod; 11. Movable groove; 12. Take-up roller; 13. Connecting rod; 14. First magnet; 15. Second magnet; 16. Spring; 17. Guide rod; 18. Drive rod; 19. First gearbox; 20. Second gearbox; 21. Controller; 22. First rotating wheel; 23. Second rotating wheel; 24. Transmission belt; 25. Driven rotating wheel; 26. Reciprocating screw; 27. Moving plate; 28. Linkage rod; 29. ​​Lifting rod; 30. Spraying hole; 31. Air suction hole; 32. Moving cavity; 33. Pusher plate; 34. One-way ventilation valve; 35. Vent hole; 36. Fixed plate; 37. Processing plate. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0020] Please see Figure 1-10A chemical solution spraying device for surface modification of polyethylene fibers includes a lifting platform 1 and a controller 21 disposed within the lifting platform 1. A motor 3 is electrically connected to the side wall of the controller 21. A drive rod 18 is driven by a transmission assembly on the upper wall of the motor 3. A worktable 2 is disposed on the upper wall of the lifting platform 1. The upper end of the drive rod 18 passes through the worktable 2. A spraying assembly is fixedly disposed on the upper wall of the drive rod 18. Two take-up rollers 12 are rotatably disposed on the side wall of the lifting platform 1. Fibers 8 are transmitted between the two take-up rollers 12, and the fibers 8 correspond to the spraying assembly. A rotating rod 7 is rotatably disposed laterally on the upper wall of the worktable 2. The rotating rod 7 and the drive rod 18 are mutually transmitted. An auxiliary mechanism is disposed between one end of the rotating rod 7 and the lifting platform 1. The auxiliary mechanism includes a connecting assembly and a processing assembly. The connecting assembly includes a connecting rod 13 rotatably disposed at one end of the rotating rod 7, a first magnet 14 disposed on the side wall of the rotating rod 7, a second magnet 15 disposed on the side wall of the connecting rod 13, the first magnet 14 and the second magnet 15 attract each other, a fixing plate 36 is fixed on the upper side wall of the connecting rod 13, and a spring 16 is connected between the fixing plate 36 and the upper wall of the worktable 2. The processing assembly includes a telescopic frame 9 fixedly mounted on the side wall of the connecting rod 13. A movable rod 10 is rotatably mounted at the end of the telescopic frame 9. A movable groove 11 is rotatably mounted on the side wall of the lifting platform frame 1. The movable rod 10 moves in and out within the movable groove 11. A processing plate 37 is also fixedly mounted on the side wall of the telescopic frame 9. The processing plate 37 and the fiber 8 correspond to each other. An air extraction assembly is also provided between the transmission assembly and the lower wall of the worktable 2; When the drive rod 18 rotates, it drives the rotating rod 7 to rotate via the first gearbox 19 and the second gearbox 20. When the rotating rod 7 starts to rotate, it drives the connecting rod 13 to rotate synchronously via the first magnet 14 and the second magnet 15. When the connecting rod 13 rotates, it gradually compresses the spring 16. When the processing plate 37 contacts the surface of the fiber 8 and the fiber 8 is leveled, the spring 16 is compressed to its limit. Under the elastic action of the spring 16, the first magnet 14 and the second magnet 15 separate from each other, causing the spring 16 to push the connecting rod 13 to rotate in the opposite direction, thereby bringing the processing plate 37 back to its original position. The first magnet 14 and the second magnet 15 are attracted together again to prepare for the next leveling and smoothing process. Through the intermittent processing, the modification effect of the fiber 8 can be guaranteed without affecting the continuous transmission process of the fiber 8, ensuring the continuity of chemical modification and ensuring that the chemical solution covers the surface of the polyethylene fiber 8 evenly. Example

[0021] Please see Figure 1-10 This embodiment provides a technical solution based on Embodiment 1: The transmission assembly includes a first wheel 22 driven by the motor 3, a second wheel 23 fixedly provided on the side wall of the drive rod 18, and a transmission belt 24 connecting the first wheel 22 and the second wheel 23.

[0022] It should be noted that when the driven wheel 25 is driven to rotate by the transmission belt 24, the moving plate 27 moves up and down on the side wall of the reciprocating screw 26.

[0023] In an optional embodiment: the spraying assembly includes a spraying turntable 4 fixed to the upper end of the drive rod 18, a fixing box 5 fixed to the upper wall of the spraying turntable 4, and three spraying plates 6 are provided at equal angles on the side wall of the spraying turntable 4. Each of the three spraying plates 6 has a spraying hole 30 on its lower wall, and the spraying hole 30 is oriented toward the fiber 8.

[0024] It should be noted that when the motor 3 is running, the drive rod 18 is driven to rotate through the transmission of the first rotating wheel 22, the second rotating wheel 23 and the transmission belt 24. When the drive rod 18 rotates, the chemical solution stored in the fixed box 5 is sprayed onto the fiber 8 through the spraying hole 30 by the spraying turntable 4. Through the three spraying holes 30 that are equally spaced, the surface of the fiber 8 can be sprayed while rotating at a constant speed, achieving the effect of intermittent spraying. This ensures uniformity while allowing an adsorption and precipitation process between the solution and the fiber 8, thus ensuring the spraying effect.

[0025] In an optional embodiment: a second gearbox 20 is provided on the side wall of the rotating rod 7, and a first gearbox 19 is provided on the side wall of the driving rod 18. The rotating rod 7 and the driving rod 18 are connected by the second gearbox 20 and the first gearbox 19.

[0026] In an optional embodiment: a guide rod 17 is fixedly provided on the upper wall of the workbench 2, and a spring 16 is wound around the guide rod 17.

[0027] It should be noted that the bending path of spring 16 is limited to prevent uncontrollable bending of spring 16.

[0028] In an optional embodiment: the air extraction assembly includes a driven wheel 25 driven on the side wall of the transmission belt 24, a reciprocating screw 26 fixed on the lower wall of the driven wheel 25, a moving plate 27 matched on the side wall of the reciprocating screw 26, the moving plate 27 and the lifting platform 1 are connected by a linkage rod 28, a lifting rod 29 fixed on the upper wall of the other end of the linkage rod 28, a plurality of air intake holes 31 are provided on the upper wall of the workbench 2, a moving cavity 32 is also provided in the workbench 2, the air intake holes 31 and the moving cavity 32 are interconnected, a pusher plate 33 is laterally sealed in the moving cavity 32, a one-way ventilation valve 34 is provided on the side wall of the pusher plate 33, a vent hole 35 is also provided at the lower end of the moving cavity 32, the lower wall of the pusher plate 33 and the lifting rod 29 are fixed to each other, the plurality of air intake holes 31 are all located on the lower wall of the fiber 8, and the diameter of the air intake hole 31 is 1mm.

[0029] It should be noted that when the driven wheel 25 is rotated by the transmission belt 24, the moving plate 27 moves up and down on the side wall of the reciprocating screw 26, thereby driving the pusher plate 33 to move up and down in the moving cavity 32. When the moving cavity 32 moves downward, suction force is generated in the suction hole 31, which adsorbs the fiber 8 onto the upper wall of the worktable 2. The magnitude of the suction force in the suction hole 31 can be controlled by the transmission ratio, making the fiber 8 more stable when spraying the solution. It can also be used in conjunction with the leveling and uniform coating of the treatment plate 37 to ensure the effect of chemical modification of the fiber 8.

[0030] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0031] When using this device, the fiber 8 to be sprayed is first tightly wound between two take-up rollers 12. The modified chemical solution to be sprayed is stored in the fixed box 5. Then, the motor 3 is started by the controller 21. When the motor 3 is running, it drives the drive rod 18 to rotate through the transmission of the first rotating wheel 22, the second rotating wheel 23 and the transmission belt 24. When the drive rod 18 rotates, the chemical solution stored in the fixed box 5 is sprayed onto the fiber 8 through the spraying holes 30 by the spraying turntable 4. Through the three spraying holes 30 that are equally spaced, the surface of the fiber 8 can be sprayed while rotating at a uniform speed, achieving the effect of interval spraying. This ensures uniformity and allows for an adsorption and precipitation process between the solution and the fiber 8, ensuring the spraying effect. Simultaneously, through the transmission belt 24, the driven wheel 25 is driven to rotate, and the moving plate 27 moves up and down on the side wall of the reciprocating screw 26, thereby driving the pusher plate 33 to move up and down in the moving cavity 32. When the moving cavity 32 moves downward, suction force is generated in the suction hole 31, which adsorbs the fiber 8 onto the upper wall of the worktable 2. The magnitude of the suction force in the suction hole 31 can be controlled by the transmission ratio, making the fiber 8 more stable when spraying the solution, and it can be combined with the leveling and uniform coating of the treatment plate 37 to ensure the effect of chemical modification of the fiber 8. When the drive rod 18 rotates, the first gearbox 19 and the second gearbox 20 can drive the rotating rod 7 to rotate. When the rotating rod 7 starts to rotate, the first magnet 14 and the second magnet 15 can drive the connecting rod 13 to rotate synchronously. When the connecting rod 13 rotates, the spring 16 is gradually compressed. When the processing plate 37 and the surface of the fiber 8 come into contact and the fiber 8 is leveled, the spring 16 is compressed to the extreme. Under the elastic action of the spring 16, the first magnet 14 and the second magnet 15 separate from each other, so that the spring 16 pushes the connecting rod 13 to rotate in the opposite direction, thereby bringing the processing plate 37 to its original position. The first magnet 14 and the second magnet 15 are attracted together again to prepare for the next leveling and smoothing process. Through the intermittent processing process, the modification effect of the fiber 8 can be guaranteed, while the continuous transmission process of the fiber 8 will not be affected, ensuring the continuity of chemical modification and ensuring that the chemical solution covers the surface of the polyethylene fiber 8 evenly. Through the cooperation of structures such as the one-way ventilation valve 34 and the vent 35, when the push plate 33 moves upward in the moving cavity 32, the air below the push plate 33 can be drawn into the top of the push plate 33 through the one-way ventilation valve 34, which effectively prevents the push plate 33 from exerting a thrust on the lower wall of the fiber 8 when it moves upward, thus ensuring the normal operation of the device.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chemical solution spraying device for surface modification of polyethylene fibers, comprising a lifting platform (1) and a controller (21) disposed within the lifting platform (1), wherein a motor (3) is electrically connected to the side wall of the controller (21), a drive rod (18) is driven by a transmission assembly on the upper wall of the motor (3), a worktable (2) is provided on the upper wall of the lifting platform (1), the upper end of the drive rod (18) is disposed through the worktable (2), and a spraying assembly is fixedly provided on the upper wall of the drive rod (18), characterized in that: Two take-up rollers (12) are rotatably provided on the side wall of the lifting platform (1), and fibers (8) are transmitted between the two take-up rollers (12). The fibers (8) correspond to the spraying components. A rotating rod (7) is rotatably provided on the upper wall of the worktable (2). The rotating rod (7) and the drive rod (18) are mutually transmitted. An auxiliary mechanism is provided between one end of the rotating rod (7) and the lifting platform (1). The auxiliary mechanism includes a connecting component and a processing component. The connecting assembly includes a connecting rod (13) rotatably disposed at one end of the rotating rod (7). A first magnet (14) is provided on the side wall of the rotating rod (7), and a second magnet (15) is provided on the side wall of the connecting rod (13). The first magnet (14) and the second magnet (15) attract each other. A fixing plate (36) is fixed on the upper side wall of the connecting rod (13), and a spring (16) is connected between the fixing plate (36) and the upper wall of the worktable (2). The processing assembly includes a telescopic frame (9) fixedly mounted on the side wall of the connecting rod (13), with a movable rod (10) rotatably mounted at the end of the telescopic frame (9), and a movable groove (11) rotatably mounted on the side wall of the lifting platform (1). The movable rod (10) moves in and out within the movable groove (11). A processing plate (37) is also fixedly mounted on the side wall of the telescopic frame (9), and the processing plate (37) and the fiber (8) correspond to each other. An air extraction assembly is also provided between the transmission assembly and the lower wall of the worktable (2).

2. The chemical solution spraying equipment for surface modification of polyethylene fibers according to claim 1, characterized in that: The transmission assembly includes a first wheel (22) driven by a motor (3), a second wheel (23) fixedly provided on the side wall of the drive rod (18), and a transmission belt (24) driving between the first wheel (22) and the second wheel (23).

3. The chemical solution spraying equipment for surface modification of polyethylene fibers according to claim 1, characterized in that: The spraying assembly includes a spraying turntable (4) fixed to the upper end of the drive rod (18). A fixing box (5) is fixed to the upper wall of the spraying turntable (4). Three spraying plates (6) are provided at equal angles on the side wall of the spraying turntable (4). Spraying holes (30) are provided on the lower wall of each of the three spraying plates (6). The spraying holes (30) are oriented toward the fiber (8).

4. The chemical solution spraying equipment for surface modification of polyethylene fibers according to claim 1, characterized in that: The rotating rod (7) has a second gearbox (20) on its side wall, and the driving rod (18) has a first gearbox (19) on its side wall. The rotating rod (7) and the driving rod (18) are connected by the second gearbox (20) and the first gearbox (19).

5. The chemical solution spraying equipment for surface modification of polyethylene fibers according to claim 1, characterized in that: A guide rod (17) is fixedly provided on the upper wall of the workbench (2), and the spring (16) is wound around the guide rod (17).

6. The chemical solution spraying equipment for surface modification of polyethylene fibers according to claim 1, characterized in that: The air extraction assembly includes a driven wheel (25) driven on the side wall of the transmission belt (24), a reciprocating screw (26) fixed on the lower wall of the driven wheel (25), a moving plate (27) matched on the side wall of the reciprocating screw (26), the moving plate (27) and the lifting platform (1) are connected by a linkage rod (28), and a lifting rod (29) is fixed on the upper wall of the other end of the linkage rod (28).

7. The chemical solution spraying equipment for surface modification of polyethylene fibers according to claim 6, characterized in that: The upper wall of the workbench (2) is provided with multiple air intake holes (31). The workbench (2) is also provided with a moving cavity (32). The air intake holes (31) and the moving cavity (32) are connected to each other. The moving cavity (32) is provided with a horizontally sealed pusher plate (33). The side wall of the pusher plate (33) is provided with a one-way ventilation valve (34). The lower end of the moving cavity (32) is also provided with a ventilation hole (35). The lower wall of the pusher plate (33) and the lifting rod (29) are fixed to each other.

8. The chemical solution spraying equipment for surface modification of polyethylene fibers according to claim 7, characterized in that: Multiple air inlets (31) are located on the lower wall of the fiber (8), and the diameter of the air inlets (31) is set to 1 mm.

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