A cleaning device for an electro-fluidic jet and an inkjet printing system

Abstract

The application relates to a cleaning device of an electro-fluid ejection head and an inkjet printing system, which comprises a cleaning assembly, the cleaning assembly comprising a cleaning tank and an ultrasonic unit, the cleaning tank being filled with cleaning liquid, and the ultrasonic unit being installed in the cleaning tank; and at least one set of air knife assemblies, a plurality of sets of air knife assemblies being arranged on the periphery of the cleaning tank, the air knife assembly comprising a mounting frame and a blowing head, the blowing head being installed on the mounting frame and being higher than the cleaning tank, and the blowing head being used for air cleaning of the ejection head. The application utilizes the air knife assembly to blow the surface of the cleaned ejection head, so as to blow off the cleaning liquid and the diluted printing material attached to the surface of the ejection head, to ensure the cleanliness and dryness of the surface of the ejection head, and to avoid printing defects caused by the poor surface state of the ejection head, thereby improving the printing quality.

Description

Technical Field

[0001] This application relates to the field of printhead cleaning technology, and in particular to a cleaning device for electro-hydraulic printheads and an inkjet printing system. Background Technology

[0002] Inkjet printing technology, as an additive manufacturing technology, has advantages such as non-contact, large area, no need for photomasks, rapid manufacturing, low cost of finished products, and direct pattern creation on planar / curved substrates. It is the main manufacturing technology for printed electronics that will replace the long process of photolithography / vacuum (development, etching, exposure and cleaning, etc.) and is widely used in display, sensing, chip, energy, aerospace and other fields.

[0003] During printing, printing material may adhere to the printhead, degrading its surface properties and interfering with the spraying of the material. This can alter the overall characteristics of the droplets, causing them to shift in position, form satellite droplets (where a small portion of a complete droplet separates and falls to the surrounding area), or become blurred. All of this negatively impacts print quality.

[0004] In related technologies, the printhead is moved into a cleaning tank and cleaned using ultrasonic vibration, thereby reducing the adhesion of printing material on the printhead surface and ensuring print quality.

[0005] However, even after ultrasonic cleaning in the cleaning tank, the surface of the printhead will still be covered with cleaning fluid, and may even be covered with diluted printing material, which will still affect the surface performance of the printhead. During subsequent printing, satellite droplets and other issues will still occur, which will have an adverse effect on the printing effect. Utility Model Content

[0006] This application provides a cleaning device for a current-current printhead and an inkjet printing system to solve the technical problem in the related art that the cleanliness of the printhead surface cannot be guaranteed after cleaning, which has an adverse effect on the subsequent printing effect.

[0007] In a first aspect, a cleaning device for an electro-hydraulic nozzle is provided, comprising: A cleaning assembly, comprising a cleaning tank and an ultrasonic unit, wherein the cleaning tank is filled with cleaning fluid and the ultrasonic unit is installed inside the cleaning tank; At least one set of air knife assemblies and multiple sets of air knife assemblies are arranged around the periphery of the cleaning tank. Each air knife assembly includes a mounting bracket and a blower head. The blower head is mounted on the mounting bracket and is higher than the cleaning tank. The blower head is used to blow air to clean the nozzle. An air blowing device is installed on the cleaning tank and is used to blow air onto the surface of the cleaning liquid in the cleaning tank.

[0008] In some embodiments, the blower head is tilted downwards toward the nozzle to blow air.

[0009] In some embodiments, the air knife assembly further includes a lifting mechanism mounted on the mounting bracket and connected to the blower head drive to drive the blower head to move up and down.

[0010] In some embodiments, the cleaning device for the electro-hydraulic nozzle further includes a vision inspection component, which includes: An imaging module is arranged on one side of the cleaning tank; A supplementary lighting element is provided, spaced apart from the imaging module, and is used to provide imaging light to the nozzle; wherein... The nozzle moves between the imaging module and the supplementary lighting element, and the imaging module images the nozzle.

[0011] In some embodiments, the imaging assembly further includes a rangefinder connected to the imaging module, the rangefinder being used to measure the distance from the imaging module to the plane on which the imaging module is mounted.

[0012] In some embodiments, the cleaning assembly further includes: A liquid supply assembly, comprising a liquid supply tank and a liquid supply pump, wherein the liquid supply tank is connected to the cleaning tank via the liquid supply pump; The liquid extraction assembly includes a waste liquid tank and a waste liquid pump. The bottom of the cleaning tank is provided with a drain outlet, and the waste liquid tank is connected to the drain outlet of the cleaning tank through the waste liquid pump.

[0013] In some embodiments, the cleaning assembly further includes a clamping assembly comprising a fixing plate and a shielding plate, both of which are mounted at the opening of the cleaning tank. The mounting end of the ultrasonic unit is located between the fixing plate and the shielding plate, so as to be clamped and fixed by the shielding plate and the fixing plate.

[0014] In some embodiments, the baffle plate covers and blocks the opening of the cleaning tank, and the baffle plate has a through cleaning port, the cross-sectional area of ​​which is smaller than the cross-sectional area of ​​the opening of the cleaning tank.

[0015] The beneficial effects of the technical solution provided in this application include: This application provides a cleaning device for a current-current fluid printhead. During printhead cleaning, the printhead is first moved into the cleaning tank, where an ultrasonic unit, in conjunction with cleaning fluid, cleans the printhead to remove printing material adhering to its surface. Subsequently, the printhead is removed from the cleaning tank, and the air knife assembly's blower head cleans the printhead surface with air to remove cleaning fluid and diluted printing material adhering to the printhead surface, ensuring the cleanliness and dryness of the printhead surface. This prevents printing defects caused by poor printhead surface condition and improves print quality.

[0016] In addition, by using an air blower to blow air onto the surface of the cleaning fluid, the printing material suspended on the surface of the cleaning fluid is blown to the tank wall near the cleaning tank. When the printhead is subsequently removed from the cleaning fluid, the printing material is less likely to stick, thereby improving the cleanliness of the printhead surface.

[0017] Secondly, an inkjet printing system is provided, including a cleaning device for the electro-hydraulic printhead as described above.

[0018] Another embodiment of this application provides an inkjet printing system. Since the inkjet printing system includes the above-mentioned cleaning device for the electro-hydraulic printhead, the beneficial effects of the inkjet printing system are the same as those of the above-mentioned cleaning device for the electro-hydraulic printhead, and will not be repeated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a cleaning device for an electrothermal nozzle provided in an embodiment of this application; Figure 2 This is a partial schematic diagram of the cleaning assembly provided in an embodiment of this application; Figure 3 A partial exploded view of the cleaning assembly provided in an embodiment of this application; Figure 4 A schematic diagram of an air knife assembly provided in other embodiments of this application; Figure 5 A partial schematic diagram of a cleaning assembly provided in other embodiments of this application; Figure 6 This is a schematic diagram of a visual inspection component provided in other embodiments of this application.

[0021] In the diagram: 1. Cleaning assembly; 11. Cleaning tank; 11a. Drain outlet; 11b. Inlet; 12. Ultrasonic unit; 13. Liquid supply assembly; 131. Liquid supply tank; 132. Liquid supply pump; 14. Liquid extraction assembly; 141. Waste liquid tank; 142. Waste liquid pump; 15. Clamping assembly; 151. Fixing plate; 152. Baffle plate; 152a. Cleaning port; 15a. Clamping groove; 2. Air knife assembly; 21. Mounting bracket; 22. Air blower head; 23. Lifting motion mechanism; 3. Vision inspection assembly; 31. Imaging module; 32. Light supplement component; 33. Focusing motion platform; 34. Rangefinder component; 4. Air blowing component; a. Nozzle. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] This application provides a cleaning device for a fluid printhead and an inkjet printing system. It utilizes an air knife assembly to blow air onto the surface of the cleaned printhead, removing cleaning fluid and diluted printing material adhering to the printhead surface. This ensures the cleanliness and dryness of the printhead surface, preventing printing defects caused by poor printhead surface condition and improving print quality. This application solves the technical problem in related technologies where printhead cleaning still cannot guarantee surface cleanliness, negatively impacting subsequent printing results.

[0024] Reference Figure 1 A cleaning device for an inkjet printhead includes a cleaning assembly 1 and at least one set of air knife assemblies 2. Both the cleaning assembly 1 and the air knife assemblies 2 are mounted on a mounting platform within an inkjet printing system. The cleaning assembly 1 washes the printhead a with water, while the air knife assemblies 2 blow air onto the washed printhead a to remove cleaning fluid and diluted printing material adhering to its surface, ensuring the cleanliness and dryness of the printhead a after cleaning, thereby guaranteeing print quality.

[0025] Reference Figures 1-3 The cleaning assembly 1 includes a cleaning tank 11 and an ultrasonic unit 12. The cleaning tank 11 is suspended and mounted on the mounting platform of the inkjet printing system via a frame. The cleaning tank 11 is filled with cleaning fluid, and the top of the cleaning tank 11 is open, allowing the printhead a to extend into the cleaning tank 11 and into the cleaning fluid for cleaning. The ultrasonic unit 12 is installed inside the cleaning tank 11, and the ultrasonic unit 12 causes the cleaning fluid to vibrate ultrasonically within the cleaning tank 11, thereby cleaning the printhead a inside the cleaning tank 11.

[0026] Reference Figures 1-3 Specifically, the cleaning assembly 1 further includes a clamping assembly 15, which is used to fix the ultrasonic unit 12 within the cleaning tank 11. The clamping assembly 15 includes a fixing plate 151 and a baffle plate 152, both of which are installed at the opening of the cleaning tank 11 and are arranged flat. Both the fixing plate 151 and the baffle plate 152 are connected to the cleaning tank 11 by bolts or pins.

[0027] The mounting end of the ultrasonic unit 12 is located between the fixing plate 151 and the shielding plate 152, and is clamped and fixed by the shielding plate 152 and the fixing plate 151. With the mounting end of the ultrasonic unit 12 clamped and fixed, the main body of the ultrasonic unit 12 extends into the cleaning tank 11. This achieves the fixation of the ultrasonic unit 12.

[0028] This configuration allows the ultrasonic unit 12 to be fixed inside the cleaning tank 11 by clamping, which facilitates the installation and removal of the ultrasonic unit 12. When the cleaning tank 11 needs to be cleaned, the ultrasonic unit 12 can be removed at the same time by removing the shield 152 and the fixing plate 151. When installing the shield 152 and the fixing plate 151, it is also convenient to install the ultrasonic unit 12 together.

[0029] Reference Figures 1-3 Furthermore, both the shielding plate 152 and the fixing plate 151 have clamping grooves 15a on their mutually facing end faces. The shape of the clamping grooves 15a matches the shape of the mounting end of the ultrasonic unit 12, so as to clamp the ultrasonic unit 12 through the clamping grooves 15a and improve the clamping strength of the ultrasonic unit 12.

[0030] Reference Figures 1-3 The baffle plate 152 covers and blocks the opening of the cleaning tank 11. A through cleaning port 152a is provided on the baffle plate 152, through which the nozzle a is adapted to extend into the cleaning tank 11. The baffle plate 152 blocks the opening of the cleaning tank 11 near the tank wall, so that the cross-sectional area of ​​the opening of the cleaning port 152a is smaller than the cross-sectional area of ​​the opening of the cleaning tank 11.

[0031] This design, by reducing the size of the opening of the cleaning tank 11 and shielding the edges of the opening, prevents the cleaning fluid from overflowing from the edges of the opening of the cleaning tank 11 due to vibration during the cleaning process.

[0032] Reference Figures 1-3 The cleaning assembly 1 further includes a liquid supply assembly 13 and a liquid extraction assembly 14. The liquid supply assembly 13 supplies cleaning fluid to the cleaning tank 11. The liquid extraction assembly 14 removes used cleaning fluid from the cleaning tank 11. The cleaning effect of the nozzle a is ensured by replacing the cleaning fluid.

[0033] Reference Figures 1-3 The liquid supply assembly 13 includes a liquid supply tank 131 and a liquid supply pump 132. The liquid supply tank 131 is connected to the cleaning tank 11 via the liquid supply pump 132. A baffle plate 152 has a liquid inlet 11b, and the output end of the liquid supply pump 132 is connected to the liquid inlet 11b on the baffle plate 152 to supply cleaning liquid to the cleaning tank 11. In this embodiment, the liquid supply tank 131, the liquid supply pump 132, and the liquid inlet 11b are all connected by pipes.

[0034] Reference Figures 1-3 The liquid extraction assembly 14 includes a waste liquid tank 141 and a waste liquid pump 142. A drain port 11a is provided at the bottom of the cleaning tank 11, and the waste liquid tank 141 is connected to the drain port 11a of the cleaning tank 11 via the waste liquid pump 142. The input end of the waste liquid pump 142 is connected to the drain port 11a. In this embodiment, the waste liquid tank 141, the waste liquid pump 142, and the drain port 11a are all connected by pipes.

[0035] This setup ensures that the cleaning solution is completely removed by drawing it out from the bottom of the cleaning tank 11, thus preventing contamination of the subsequently replenished cleaning solution, maintaining the cleanliness of the cleaning solution, and improving the cleaning effect on nozzle a.

[0036] Reference Figures 1-3 In this embodiment, two sets of air knife assemblies 2 are arranged around the periphery of the cleaning tank 11. The two sets of air knife assemblies 2 are respectively arranged on opposite sides of the cleaning tank 11. The two sets of air knife assemblies 2 blow air onto opposite sides of the nozzle a to ensure that the surface of the nozzle a is cleaned.

[0037] Reference Figures 1-3 Specifically, the air knife assembly 2 includes a mounting bracket 21 and a blower head 22. The mounting bracket 21 is installed on the mounting platform of the inkjet printing system, and the blower head 22 is installed on the mounting bracket 21, with the blower head 22 higher than the cleaning tank 11. The blower head 22 is connected to an external air supply device, which supplies air to the blower head 22 to blow out cleaning gas. After the printhead a is cleaned in the cleaning tank 11, the printhead a rises above the cleaning tank 11, at which point the blower head 22 blows and washes the printhead a to remove the cleaning fluid and printing material from its surface.

[0038] Reference Figure 4 Furthermore, the blower head 22 is tilted downwards towards the nozzle a. The tilted blower head 22 blows air downwards towards the nozzle a, on the one hand using the air knife-like cleaning gas blown out by the blower head 22 to scrape away the liquid on the surface of the nozzle a, and on the other hand avoiding radial force on the nozzle a, reducing the possibility of damage to the nozzle a.

[0039] Reference Figure 4Optionally, in some embodiments, the air knife assembly 2 further includes a lifting mechanism 23, which is mounted on the mounting frame 21. The blower head 22 is slidably and vertically mounted on the mounting frame 21, and the lifting mechanism 23 is driven to connect with the blower head 22 to drive the blower head 22 to move vertically. In this embodiment, the lifting mechanism 23 includes a lead screw mechanism, a linear electrode, or a cylinder.

[0040] This configuration allows the blower head 22 to move up and down, enabling it to clean the nozzle a at different heights, ensuring that the entire surface of the nozzle a is cleaned. Furthermore, when the length of the nozzle a varies, its height after leaving the cleaning tank 11 differs; by adjusting the height of the blower head 22, it is convenient to clean the nozzles a at different heights.

[0041] Reference Figure 5 Optionally, in some embodiments, the cleaning device for the electro-hydraulic nozzle further includes an air blowing element 4, which is mounted on the cleaning tank 11 and is used to blow air toward the surface of the cleaning liquid in the cleaning tank 11.

[0042] With this setup, the air blowing component 4 blows air onto the surface of the cleaning liquid to blow the printing material suspended on the surface of the cleaning liquid to the tank wall near the cleaning tank 11. When the printhead a is subsequently removed from the cleaning liquid, it is less likely to have printing material adhering to it, thereby improving the cleanliness of the printhead a surface.

[0043] The air blowing component 4 includes a nozzle, which is mounted on the cleaning tank 11 via an air blowing frame. The nozzle is connected to an external air supply device, which supplies air to the nozzle.

[0044] Reference Figure 1 The cleaning device for the current-current printhead also includes a vision inspection component 3, which comprises an imaging module 31 and a supplementary lighting component 32. The imaging module 31 is arranged on one side of the cleaning tank 11 and is mounted on the mounting platform of the inkjet printing system via an imaging frame; the supplementary lighting component 32 is mounted on the mounting platform of the inkjet printing system, and is spaced apart from the imaging module 31. The supplementary lighting component 32 is used to provide imaging light to the printhead a.

[0045] Reference Figure 1 and Figure 6 The nozzle a moves between the imaging module 31 and the supplementary light component 32, and the imaging module 31 images the nozzle a.

[0046] This setup allows us to image the nozzle a to determine the cleaning status of its surface, thus ensuring the cleaning effect of the nozzle a.

[0047] In this embodiment, the imaging module 31 includes a camera, and the lighting component 32 includes a lighting lamp.

[0048] Reference Figure 1 and Figure 6 The visual inspection component 3 further includes a focusing motion platform 33, through which the imaging module 31 is mounted on the imaging frame. The focusing motion platform 33 moves the imaging module 31 closer to or further away from the supplementary lighting component 32, so that the nozzle a is positioned on the imaging plane of the imaging module 31. In this embodiment, the focusing motion platform 33 includes a lead screw mechanism or a linear motor.

[0049] In addition, before printhead a starts printing, its height needs to be calibrated to facilitate subsequent adjustments to the printing height between printhead a and the printing plane.

[0050] Since the height of the imaging module 31 is fixed, before the printhead a prints, the height of the nozzle of the printhead a can be calibrated by moving the nozzle of the printhead a to a preset calibration point in the imaging plane of the imaging module 31, so as to improve the accuracy of subsequent printhead a printing.

[0051] In this embodiment, the imaging direction of the imaging module 31 is set horizontally. This facilitates determining the height of the calibration point on the focal plane of the imaging module 31 based on its height, and thus facilitates determining the height of the calibrated nozzle a.

[0052] Reference Figure 6 Furthermore, in some embodiments, the imaging assembly further includes a rangefinder 34 connected to the imaging module 31. The rangefinder 34 is used to measure the distance from the imaging module 31 to the plane on which the imaging module 31 is mounted. In this embodiment, the rangefinder 34 is used to measure the distance from the imaging module 31 to the mounting platform of the inkjet printing system to determine the height of the imaging module 31. In this embodiment, the rangefinder 34 includes a laser rangefinder.

[0053] With this setup, after determining the height of the imaging module 31 using the ranging device 34, the height calibration of the nozzle a is more accurate when using the imaging module 31 as a reference to calibrate its height.

[0054] This application provides a cleaning device for a current-current printhead. During cleaning, printhead a is first moved into the cleaning tank 11. An ultrasonic unit 12, in conjunction with cleaning fluid, cleans printhead a to remove printing material adhering to its surface. Subsequently, printhead a is removed from the cleaning tank 11, and the blower head 22 of the air knife assembly 2 blows air onto the surface of printhead a to remove cleaning fluid and diluted printing material adhering to its surface. This ensures the cleanliness and dryness of the printhead a surface, preventing printing defects due to poor surface condition and improving print quality.

[0055] Another embodiment of this application provides an inkjet printing system, including a cleaning device for the electrohydrodynamic printhead as described above.

[0056] Another embodiment of this application provides an inkjet printing system. Since the inkjet printing system includes the above-mentioned cleaning device for the electro-hydraulic printhead, the beneficial effects of the inkjet printing system are the same as those of the above-mentioned cleaning device for the electro-hydraulic printhead, and will not be repeated here.

[0057] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0058] It should be noted that in this application, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A cleaning device with an electro-hydraulic nozzle, characterized in that, It includes: A cleaning assembly, comprising a cleaning tank and an ultrasonic unit, wherein the cleaning tank is filled with cleaning fluid and the ultrasonic unit is installed inside the cleaning tank; At least one set of air knife assemblies and multiple sets of air knife assemblies are arranged around the periphery of the cleaning tank. Each air knife assembly includes a mounting bracket and a blower head. The blower head is mounted on the mounting bracket and is higher than the cleaning tank. The blower head is used to blow air to clean the nozzle.

2. The cleaning device for the electro-hydraulic nozzle according to claim 1, characterized in that, The blower head is tilted downwards towards the nozzle to blow air.

3. The cleaning device with an electro-hydraulic nozzle according to claim 1 or 2, characterized in that, The air knife assembly also includes a lifting mechanism, which is mounted on the mounting frame and is connected to the blower head drive to drive the blower head to move up and down.

4. The cleaning device for the electrohydrodynamic nozzle according to claim 1, characterized in that, It also includes a visual inspection component, which includes: An imaging module is arranged on one side of the cleaning tank; A supplementary lighting element is provided, spaced apart from the imaging module, and is used to provide imaging light to the nozzle; wherein... The nozzle moves between the imaging module and the supplementary lighting element, and the imaging module images the nozzle.

5. The cleaning device for the electrohydrodynamic nozzle according to claim 4, characterized in that, The imaging module also includes a distance measuring device connected to the imaging module, which is used to measure the distance from the imaging module to the plane on which the imaging module is mounted.

6. The cleaning device for the electro-hydraulic nozzle according to claim 1, characterized in that, It also includes an air blowing device, which is installed on the cleaning tank and is used to blow air onto the surface of the cleaning liquid in the cleaning tank.

7. The cleaning device for the electro-hydraulic nozzle according to claim 1, characterized in that, The cleaning assembly also includes: A liquid supply assembly, comprising a liquid supply tank and a liquid supply pump, wherein the liquid supply tank is connected to the cleaning tank via the liquid supply pump; The liquid extraction assembly includes a waste liquid tank and a waste liquid pump. The bottom of the cleaning tank is provided with a drain outlet, and the waste liquid tank is connected to the drain outlet of the cleaning tank through the waste liquid pump.

8. The cleaning device for the electro-hydraulic nozzle according to claim 1, characterized in that, The cleaning assembly further includes a clamping assembly, which includes a fixing plate and a shielding plate. Both the fixing plate and the shielding plate are installed at the opening of the cleaning tank. The mounting end of the ultrasonic unit is located between the fixing plate and the shielding plate, so as to be clamped and fixed by the shielding plate and the fixing plate.

9. The cleaning device for the electro-hydraulic nozzle according to claim 8, characterized in that, The baffle plate covers and blocks the opening of the cleaning tank. The baffle plate has a through cleaning port, and the cross-sectional area of ​​the opening of the cleaning port is smaller than the cross-sectional area of ​​the opening of the cleaning tank.

10. An inkjet printing system, characterized in that, A cleaning apparatus including an electrothermal nozzle as described in any one of claims 1 to 9.

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