Liquid drop generation device for improving printing uniformity and printing equipment

Abstract

The embodiment of the utility model provides a liquid drop generation device for improving printing uniformity and printing equipment, and relates to the technical field of printing and dyeing. The liquid drop generating device is provided with a spray hole array, the spray hole array comprises at least one row of first spray holes with a first diameter, the first spray holes with adjacent projections in the spray hole arrangement direction are uniformly arranged at a preset interval, and the preset interval is determined based on the product of the first diameter and a first preset coefficient; projections of adjacent pixel points formed by the droplet sequence array on the printing plane in the arrangement direction of the spray holes are tangent or intersected; wherein the first preset coefficient is used for representing the calculation relation between the first diameter and the diameter of a pixel point formed by spraying the liquid drop flowing through the first spraying hole on the printing plane. According to the scheme, the printing efficiency and the printing uniformity can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing and dyeing, and particularly relates to a droplet generating device for improving printing uniformity and a printing device. BACKGROUND

[0002] The positioning of pixel points of droplets on a substrate often causes dispersion between pixel points, thereby causing a gap problem. The dispersed droplets can cause a blank area on a printing plane that is not covered by fluid, i.e., a white-out phenomenon, which reduces the printing uniformity. SUMMARY

[0003] Embodiments of the present application aim to provide a droplet generating device for improving printing uniformity and a printing device to improve the printing uniformity. The specific technical solutions are as follows.

[0004] In a first aspect, the embodiments of the present application provide a droplet generating device for improving printing uniformity, which is used to print droplets on a printing plane.

[0005] The droplet generating device is provided with a nozzle array, the nozzle array includes at least one row of first nozzles with a first diameter, and adjacent first nozzles in the projection direction of the nozzle array are uniformly arranged at a preset interval, the preset interval is determined based on the product of the first diameter and a first preset coefficient, so that the projections of adjacent pixel points formed by the droplet sequence array in the nozzle array arrangement direction are tangent or intersect; wherein the first preset coefficient is used to represent the calculation relationship between the diameters of the pixel points formed by the droplets of the first diameter flowing through the first nozzles on the printing plane.

[0006] In some embodiments, the nozzle array includes multiple rows of first nozzles distributed along the nozzle array arrangement direction, and the projections of the first nozzles in different rows in the nozzle array arrangement direction are offset by the preset interval to form staggered arrangement.

[0007] In some embodiments, the nozzle array further includes at least one row of second nozzles with a second diameter, and adjacent second nozzles in the projection direction of the nozzle array are uniformly arranged at the preset interval.

[0008] The projection of the second nozzle relative to the first nozzle in the nozzle array arrangement direction is offset by half of the preset interval to form staggered arrangement with the first nozzle.

[0009] In some embodiments, the nozzle array includes multiple rows of second nozzles distributed along the nozzle array arrangement direction, and the projections of the second nozzles in different rows in the nozzle array arrangement direction are offset by the preset interval to form staggered arrangement.

[0010] In some embodiments, the droplet generating device further includes:

[0011] a common fluid path communicating the first ejection orifice and the second ejection orifice;

[0012] a common transducer to apply energy drive pulses at a preset printing frequency to cause the first ejection orifice and the second ejection orifice to form a sequence array of droplets.

[0013] In some embodiments, further comprising:

[0014] a first fluid path communicating the first ejection orifice;

[0015] a second fluid path communicating the second ejection orifice;

[0016] a first transducer to apply energy drive pulses at a preset printing frequency to cause the first ejection orifice to form a sequence array of droplets;

[0017] a second transducer to apply energy drive pulses at a preset printing frequency to cause the second ejection orifice to form a sequence array of droplets.

[0018] In some embodiments, a distance between the first ejection orifice and the second ejection orifice in a direction perpendicular to the ejection orifice arrangement is equal to a product of a target distance and the first preset coefficient, the target distance being a sum of a half of the first diameter and an integer times of the first diameter.

[0019] In some embodiments, a midpoint of a line connecting centers of two first ejection orifices in projection, a center of one of the two first ejection orifices, and a center of a second ejection orifice adjacent to the projection of the two first ejection orifices form a target triangle in projection in the ejection orifice arrangement direction;

[0020] wherein a length of one leg of the target triangle is a product of a half of the first diameter and the first preset coefficient, a length of another leg of the target triangle is a half of the preset distance, and a length of a hypotenuse of the target triangle is less than or equal to a half of a sum of a product of the second diameter and a second preset coefficient and a product of the first diameter and the first preset coefficient; wherein the second preset coefficient is used to represent a calculation relationship between the second diameter and a diameter of a pixel formed by a droplet ejected from the second ejection orifice on a printing plane.

[0021] In a second aspect, the liquid droplet generating device of the first aspect is provided, wherein the liquid droplet generating device is provided with an array of ejection orifices, the array of ejection orifices comprises at least one row of first ejection orifices with a first diameter, and projections of adjacent first ejection orifices in the array direction are arranged uniformly with a preset interval, the preset interval is determined based on a product of the first diameter and a first preset coefficient, and projections of adjacent pixel points formed by the array of liquid droplet sequences in the array direction are tangent or intersected; wherein the first preset coefficient is used to represent a calculation relationship between the first diameter and a diameter of a pixel point formed by liquid droplets ejected from the first ejection orifices on a printing plane.

[0022] The relative transmission mechanism is used to drive the printing plane to move relative to the liquid droplet generating device in a speed direction to form relative movement.

[0023] Alternatively, the liquid droplet generating device is mounted on the relative transmission mechanism, and the relative transmission mechanism drives the liquid droplet generating device to move in a speed direction to form relative movement.

[0024] In some embodiments, the printing device comprises a plurality of liquid droplet generating devices, and the plurality of arrays of ejection orifices comprise first ejection orifices distributed in the array direction, and projections of the first ejection orifices of different liquid droplet generating devices in the array direction are offset by the preset interval to form staggered arrangement.

[0025] In some embodiments, the other liquid droplet generating device is further provided with an array of ejection orifices, wherein the array of ejection orifices on the other liquid droplet generating device comprises at least one row of second ejection orifices with a second diameter, and projections of adjacent second ejection orifices in the array direction are arranged uniformly with the preset interval; wherein the second ejection orifices are offset by half of the preset interval relative to projections of the first ejection orifices of the liquid droplet generating device in the array direction to form staggered arrangement with the first ejection orifices.

[0026] In the technical scheme provided by the embodiments of the present application, the first preset coefficient is used to determine the preset interval, and adjacent first ejection orifices in the array direction are arranged uniformly with the preset interval, so that adjacent pixel points formed by the array of liquid droplet sequences through the first ejection orifices are tangent or intersected. Since the adjacent pixel points are tangent or intersected, the white area is greatly reduced, and the printing uniformity is improved.

[0027] Of course, implementing any product of the present application does not necessarily require all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained based on these drawings.

[0029] Figure 1a A schematic diagram of the three-dimensional structure of the droplet generating device provided in the embodiments of the present application;

[0030] Figure 1b A schematic diagram of the side view structure of the droplet generating device provided in the embodiments of the present application;

[0031] Figure 2a A schematic diagram of the front view structure of the nozzle plate provided in the embodiments of the present application;

[0032] Figure 2b A schematic diagram of the front view structure of the nozzle plate provided in the embodiments of the present application;

[0033] Figure 2c A schematic diagram of the front view structure of the nozzle plate provided in the embodiments of the present application;

[0034] Figure 2d A schematic diagram of the pixel points formed after printing the printing plane provided in the embodiments of the present application;

[0035] Figure 2e A schematic diagram of the pixel points formed after printing the printing plane provided in the embodiments of the present application;

[0036] Figure 3a A schematic diagram of the front view structure of the nozzle plate provided in the embodiments of the present application;

[0037] Figure 3b A schematic diagram of the front view structure of the nozzle plate provided in the embodiments of the present application;

[0038] Figure 4a A schematic diagram of the front view structure of the nozzle plate provided in the embodiments of the present application;

[0039] Figure 4b A schematic diagram of the pixel points formed after printing the printing plane provided in the embodiments of the present application using the nozzle plate shown in the figure; Figure 4a

[0040] A schematic diagram of the pixel points formed after printing the printing plane provided in the embodiments of the present application; Figure 5a

[0041] A schematic diagram of the pixel points formed after printing the printing plane provided in the embodiments of the present application; Figure 5b ​

[0042] Figure 6 A perspective view of a printing device according to an embodiment of the present application;

[0043] Figure 7 A diagram showing the angle between the liquid and the printing plane according to an embodiment of the present application;

[0044] Figure 8a A diagram showing the arrangement of multiple droplet generating devices according to an embodiment of the present application;

[0045] Figure 8b A diagram showing the arrangement of multiple droplet generating devices according to an embodiment of the present application;

[0046] Figure 9 A front view of two nozzle plates according to an embodiment of the present application;

[0047] Figure 10 A front view of three nozzle plates according to an embodiment of the present application;

[0048] Figure 11a A diagram showing the staggered arrangement of two droplet generating devices according to an embodiment of the present application;

[0049] Figure 11b A diagram showing the staggered arrangement of multiple droplet generating devices according to an embodiment of the present application;

[0050] Figure 12a A diagram showing the pixel points formed after printing by the staggered arrangement of the nozzles of two nozzle plates according to an embodiment of the present application;

[0051] Figure 12b A diagram showing the pixel points formed after printing by the staggered arrangement of the nozzles of two nozzle plates according to an embodiment of the present application;

[0052] Figure 12c A diagram showing the pixel points formed after printing by the staggered arrangement of the nozzles of two nozzle plates according to an embodiment of the present application;

[0053] Figure 12d A diagram showing the pixel points formed after printing by the staggered arrangement of the nozzles of two nozzle plates according to an embodiment of the present application;

[0054] Figure 12e A diagram showing the pixel points formed after printing by the staggered arrangement of the nozzles of two nozzle plates according to an embodiment of the present application;

[0055] Substrate 100; fluid tank 110; liquid inlet port 111; liquid outlet port 112; liquid inlet pipe 120; first on-off valve 121; pressure sensor 122; liquid outlet pipe 130; second on-off valve 131; nozzle plate 200; nozzle 210; transducer assembly 300; transducer 310; waveform generator 320; ground wire 330; support frame assembly 400; support frame 410; first fixing lug 420; second fixing lug 430; liquid supply assembly 500; base material 600; relative transmission mechanism 700; droplet generation device 800; control device 810. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art based on the present application belong to the scope of protection of the present application.

[0057] For the convenience of understanding, the words appearing in the embodiments of the present application will be explained below.

[0058] Printing plane: the plane in which the printed base material is located when performing a printing operation.

[0059] Pixel point: the area on the printing plane where the droplet ejected by the droplet generation device falls.

[0060] White-out area: the area on the printing plane that is not printed.

[0061] Droplet sequence: multiple independent droplets formed by liquid separation along the same path.

[0062] As described in the background, in current printing technology, due to the existence of overlap or gap between adjacent liquid pixel points, the printing efficiency is reduced or the uniformity is poor. Because the ejection principles of the jet printing technology and the drop-on-demand technology are different, the timing of the liquid droplet ejection and the size of the liquid droplet volume cannot be adjusted and controlled separately, and it is difficult to solve the uniformity problem only by controlling the liquid droplet generation method.

[0063] To solve the above problems, the embodiments of the present application focus on improving the layout of the nozzle array, and provide a droplet generation device 800 for printing liquid droplets on a printing plane. The liquid ejected by the droplet generation device 800 can be a liquid containing a coloring substance, such as a dye. Among them, the liquid can be one of high-temperature dispersed dye liquid, low-temperature dispersed dye liquid, reactive liquid, acid liquid; preferably, the tension of the liquid is 18 mN / m-72 mN / m. The base material of the printing plane can be a textile or other sheet material.

[0064] An implementation form of the droplet generation device 800, as shown in the perspective view of Figure 1a , as shown in the side view of Figure 1b , the droplet generation device 800 can include a substrate 100, a liquid inlet pipe 120, a nozzle plate 200, and a transducer assembly 300. The substrate 100 is provided with a fluid slot 110, the slot opening of the fluid slot 110 faces outward, and the slot wall of the fluid slot 110 is provided with a liquid inlet port 111. The liquid inlet pipe 120 communicates with the liquid inlet port 111, and the liquid inlet pipe 120 is used to pass liquid into the fluid slot 110 through the liquid inlet port 111. The nozzle plate 200 is provided with a nozzle 210, and the nozzle plate 200 covers the slot opening, and the nozzle 210 communicates with the fluid slot 110. The transducer assembly 300 is connected to the substrate 100, and the transducer assembly 300 is used to convert pulsed electrical energy into pulsed waves based on a preset printing frequency to vibrate the substrate 100, and the liquid ejected from the nozzle 210 is disturbed to form a droplet sequence for printing, that is, the transducer assembly 300 is used to apply energy driving pulses to the liquid ejected from the nozzle 210 based on a preset printing frequency, so that the liquid ejected from the nozzle 210 forms a droplet sequence array.

[0065] The droplet generation device 800 provided by the embodiment of the present application, the liquid enters the fluid slot 110 through the liquid inlet pipe 120. Since the nozzle plate 200 covers the slot opening of the fluid slot 110, the nozzle 210 of the nozzle plate 200 communicates with the fluid slot 110, and the liquid is ejected from the nozzle 210. Since the transducer assembly 300 is connected to the substrate 100, the transducer assembly 300 converts pulsed electrical energy into pulsed mechanical energy, so that the liquid ejected from the nozzle 210 is disturbed to form a droplet sequence, so as to sequence the substrate 600 for printing. The liquid can be used for dyeing the substrate.

[0066] In some embodiments, as shown in Figure 1a and Figure 1b , the transducer assembly 300 includes a transducer 310 and a waveform generator 320. The transducer 310 is arranged on the substrate 100, and the waveform generator 320 is connected to the transducer 310. The waveform generator 320 is used to transmit pulsed electrical energy to the transducer 310, and the transducer 310 is used to convert the pulsed electrical energy into pulsed waves to vibrate the substrate 100. The waveform generator 320 transmits a set voltage and current to the transducer 310, the transducer 310 converts the pulsed electrical energy into pulsed waves, and transmits the pulsed waves to the substrate 100. The substrate 100 drives the nozzle plate 200 to vibrate, the pulsed waves are transmitted to the liquid through the nozzle plate 200, the liquid is disturbed, the liquid column of the liquid is broken to generate droplets. The transducer 310 is also grounded through the ground wire 330. The working frequency of the transducer 310 is 1KHz-70KHz, and the working voltage is 5v-40v. The waveform of the transducer 310 is a square wave, a sine wave, a cosine wave, or other forms of pulsed waves, etc.

[0067] In some embodiments, the transducer assembly 300 may include multiple transducers 310, which are symmetrically arranged about the substrate 100. By arranging the transducers 310 on both sides of the substrate 100, the multiple transducers 310 simultaneously transmit pulse waves to the substrate 100, so that the vibration of the nozzle plate 200 is more uniform, the droplets generated are also more uniform, and the printing and dyeing uniformity of the droplet generating device 800 is improved. Figure 1a As shown, a transducer 310 is provided on the right side of the substrate 100, and correspondingly, a transducer 310 is symmetrically provided on the left side of the substrate 100 ( Figure 1a not shown).

[0068] In some embodiments, as Figure 1a As shown, the liquid inlet pipe 120 is provided with a first switch valve 121. When printing (ie, dyeing) the substrate 600 is performed, the first switch valve 121 is opened so that the liquid enters the fluid tank 110 through the liquid inlet pipe 120.

[0069] In some embodiments, the droplet generating device 800 may further include a controller (not shown), which is electrically connected to the transducer assembly 300. The liquid inlet pipe 120 is provided with a pressure sensor 122, which is electrically connected to the controller. The pressure sensor 122 is used to detect the pressure of the liquid in the liquid inlet pipe 120. The controller controls the transducer assembly 300 to open based on this pressure. When the pressure of the liquid in the liquid inlet pipe 120 is less than a predetermined pressure, it indicates that the fluid tank 110 is not full of liquid and needs to be further filled to avoid a failure in droplet generation and the transducer assembly 300 idling. As the liquid continues to flow through the liquid inlet pipe 120 into the fluid tank 110, the pressure increases until it reaches a predetermined pressure. When the pressure of the liquid in the liquid inlet pipe 120 reaches the predetermined pressure, the controller controls the transducer assembly 300 to open, thereby smoothly generating controllable, uniformly sized droplets. It should be noted that the first on-off valve 121 is electrically connected to the controller so that the controller controls the opening of the first on-off valve 121 during printing on the substrate 600.

[0070] In the embodiment of the present application, a droplet generating device corresponds to an optimal pressure Pi (i=1, 2, 3, ..., n), where n is the serial number of the droplet generating device, that is, the predetermined pressure value; the value range of Pi is 20kPa-100kPa.

[0071] In some embodiments, as Figure 1aAs shown, the liquid droplet generating device 800 can also include a liquid outlet pipe 130. The tank wall of the fluid tank 110 is provided with a liquid outlet port 112, the liquid outlet pipe 130 communicates with the liquid outlet port 112, and the liquid outlet pipe 130 is provided with a second switch valve 131. The liquid outlet pipe 130 and the second switch valve 131 are used to discharge part of the liquid in the fluid tank 110 to discharge the air in the fluid tank 110. When printing the substrate 600, the first switch valve 121 and the second switch valve 131 are opened at the same time, the liquid enters the fluid tank 110 through the liquid inlet pipe 120, and the air in the fluid tank 110 is discharged through the liquid outlet pipe 130. When the air in the fluid tank 110 is completely discharged, the second switch valve 131 is closed, and the controller controls the transducer assembly 300 to be turned on so as to smoothly generate liquid droplets. The liquid outlet pipe 130 communicates with the liquid supply assembly 500, and as the air in the fluid tank 110 is continuously discharged, the liquid discharged from the liquid outlet pipe 130 can return to the liquid supply assembly 500, realizing the recycling of the liquid.

[0072] In some embodiments, the ejection orifice plate 200 is a metal ejection orifice plate or a non-metal ejection orifice plate. The material of the ejection orifice plate 200 can be metal such as stainless steel, aluminum, copper, etc. to improve the service life of the ejection orifice plate 200. Of course, the material of the ejection orifice plate 200 can also be non-metal such as plastic, silicon oxide, nylon, etc. to improve the corrosion resistance of the ejection orifice plate 200 and avoid corrosion of the ejection orifice plate 200 by liquid.

[0073] In some embodiments, as shown in FIGS. 1 and 2, the substrate 100 is a cuboid, and the fluid tank 110 is arranged on one end face of the cuboid substrate 100. Figure 1a and Figure 1b In some embodiments, as shown in FIGS. 1 and 2, the substrate 100 is a cuboid, and the fluid tank 110 is arranged on one end face of the cuboid substrate 100.

[0074] In the embodiments of the present application, the liquid droplet generating device 800 is provided with an ejection orifice array, the ejection orifice array includes at least one row of first ejection orifices with a first diameter, and adjacent first ejection orifices in the ejection orifice arrangement direction are uniformly arranged at a preset interval, the preset interval is determined based on the product of the first diameter and a first preset coefficient, so that the projections of adjacent pixel points formed by the liquid droplet sequence array on the printing plane in the ejection orifice arrangement direction are tangent or intersect; wherein the first preset coefficient is used to represent the calculation relationship between the first diameter and the diameter of the pixel point formed by the liquid droplet jet flowing through the first ejection orifice on the printing plane.

[0075] In the embodiments of the present application, the preset interval can be less than or equal to the product of the first diameter and the first preset coefficient.

[0076] Figure 2a FIG. 1 is a front view of one of the ejection orifice plates provided in the embodiments of the present application, Figure 2b FIG. 2 is a front view of another of the ejection orifice plates provided in the embodiments of the present application, Figure 2cThis is the third schematic diagram of the main structure of the nozzle plate provided in the embodiment of the present application. Figures 2a to 2c As shown, the nozzles 210 provided on the nozzle plate 200 are arranged in an array to form a nozzle array. The diameter D of the nozzle 210 satisfies the following formula: D ≥ 25400 / (P * C). Wherein, D is the diameter of the nozzle, in microns; P is the nozzle resolution, which is the physical accuracy of the nozzle, and is usually expressed as the number of nozzles per inch (NPI); C is a preset coefficient (such as the first preset coefficient or the second preset coefficient), which is used to characterize the calculation relationship between the diameter D of the nozzle and the diameter D' of the pixel point formed by the droplets flowing through the nozzle and sprayed on the printing plane. The value of C can be obtained through a limited number of experiments based on factors such as the liquid supply pressure, printing frequency, and substrate diffusion. Usually C∈(1.0~2.0). Wherein, 25400 is used for unit conversion, and 1 inch is equal to 25400 microns.

[0077] 25400 / P is the distance L between adjacent nozzles in the projection of the nozzle arrangement direction, and D'=C*D is the diameter of the droplets generated by the nozzles (the diameter of the pixel point). When D=25400 / (P*C), the droplets generated by adjacent nozzles are printed on the printing plane, and the circular pixels generated are tangent in the nozzle arrangement direction, such as Figure 2d When D>25400 / (P*C), the droplets generated by adjacent nozzles are printed on the printing plane, and the circular pixel points generated intersect in the nozzle arrangement direction, as shown in Figure 2. Figure 2e Therefore, the nozzle diameter D≥25400 / (P*C) can improve the uniformity of the printing plane of the droplet generating device.

[0078] In the embodiment of the present application, the diameter D of the nozzle orifice 210 can range from 10 μm to 300 μm, and the resolution P of the nozzle orifice 210 can range from 75 dpi to 1200 dpi. Any combination of different nozzle orifice 210 diameters D and nozzle orifice 210 resolutions P can be used to adjust the amount of liquid that can be delivered by the droplet generating device 800. By increasing the nozzle orifice 210 diameter D, the flow rate of the droplet generating device 800 can be increased, thereby expanding the printing range.

[0079] Optionally, the diameter D of the nozzle hole 210 can be 10 μm to 80 μm. The volume of the droplet is 4 pl to 10,000 pl. Optionally, the volume of the droplet can be 4 pl to 1,000 pl. When the diameter D of the nozzle hole 210 is 50 μm, the volume of the droplet generated is 450 pl.

[0080] In the embodiment of the present application, a row of nozzle holes of the same diameter (such as first nozzle holes of the first diameter D) can be provided on the nozzle plate 200, that is, the nozzle array includes a row of first nozzle holes, such as Figure 2aThe projection of the first row of the first ejection holes in the ejection hole arrangement direction is offset by the preset interval L.

[0081] The ejection hole plate 200 can also be provided with multiple rows of ejection holes (such as the first ejection holes), that is, the ejection hole array includes multiple rows of the first ejection holes, such as Figure 2b and Figure 2c as shown.

[0082] When the ejection hole plate 200 is provided with multiple rows of ejection holes, the projections of the multiple rows of ejection holes in the ejection hole arrangement direction can be overlapped, that is, at the same position in the ejection hole arrangement direction, each row of the first ejection holes is provided with a first ejection hole, and the projection of each row of the first ejection holes in the ejection hole arrangement direction is offset by the preset interval L, such as Figure 2b as shown, which facilitates industrial manufacturing and reduces processing costs.

[0083] When the ejection hole plate 200 is provided with multiple rows of ejection holes, the projections of the multiple rows of ejection holes in the ejection hole arrangement direction can be staggered, that is, the ejection hole array includes multiple rows of the first ejection holes distributed in the ejection hole arrangement direction, and the projections of the first ejection holes in different rows in the ejection hole arrangement direction can be offset by the preset interval L to form a staggered arrangement, such as Figure 2c as shown. By staggering the multiple rows of ejection holes 210 in the ejection hole arrangement direction, a higher printing resolution in the ejection hole arrangement direction can be achieved on the ejection hole plate 200 with a low resolution of the ejection holes 210, and the processing difficulty of the ejection holes 210 can be reduced.

[0084] When printing is performed using the ejection hole array, the pixel points formed by the liquid ejected by the multiple ejection holes can be complementary, reducing the white area on the printing plane after printing.

[0085] For example, in order to achieve a printing resolution of 600 dpi in the ejection hole arrangement direction (i.e., the Y direction), 600 ejection holes need to be processed in a range of 1 inch in the ejection hole arrangement direction of an ejection hole plate. By processing two columns of ejection holes in a range of 1 inch in the ejection hole arrangement direction of an ejection hole plate, 300 ejection holes are processed in each column, and each ejection hole in one column is located in the middle position of adjacent ejection holes in the other column. In this way, a resolution of 600 dpi in the ejection hole arrangement direction can be achieved without processing 600 ejection holes in one column. Of course, by staggering multiple columns of ejection holes, higher printing resolutions such as 2400 dpi and 3600 dpi can also be achieved.

[0086] In the embodiments of the present application, the ejection hole plate 200 is provided with multiple rows of ejection holes, and the projections of the multiple rows of ejection holes in the ejection hole arrangement direction are overlapped (such as Figure 2bAs shown in FIG. 1, when the printing frequency is 25400 / P (P is an integer), the interval distance between two adjacent nozzles in each row can be 25400 / P, i.e., the preset interval L, and the interval distance between the two adjacent nozzles is less than or equal to D' = C*D. Specifically, in the speed direction of the printing plane (i.e., the X direction), the distance between the centers of the projections of the two adjacent nozzles located in the same row is less than or equal to D' = C*D. In this way, when the nozzle plate 200 is used, a smaller printing frequency can be used to perform printing, thereby reducing energy consumption.

[0087] In some embodiments, the nozzle plate 200 can be provided with one or more rows of nozzles (e.g., second nozzles) of other diameters (e.g., a second diameter D''), i.e., the nozzle array can further include at least one row of second nozzles. The second nozzles can be arranged in the manner of the first nozzles described above.

[0088] As shown in FIG. 1, when the printing frequency is 25400 / P (P is an integer), the interval distance between two adjacent nozzles in each row can be 25400 / P, i.e., the preset interval L, and the interval distance between the two adjacent nozzles is less than or equal to D' = C*D. Specifically, in the speed direction of the printing plane (i.e., the X direction), the distance between the centers of the projections of the two adjacent nozzles located in the same row is less than or equal to D' = C*D. In this way, when the nozzle plate 200 is used, a smaller printing frequency can be used to perform printing, thereby reducing energy consumption. Figure 3a and Figure 3b As shown in FIG. 1, when the printing frequency is 25400 / P (P is an integer), the interval distance between two adjacent nozzles in each row can be 25400 / P, i.e., the preset interval L, and the interval distance between the two adjacent nozzles is less than or equal to D' = C*D. Specifically, in the speed direction of the printing plane (i.e., the X direction), the distance between the centers of the projections of the two adjacent nozzles located in the same row is less than or equal to D' = C*D. In this way, when the nozzle plate 200 is used, a smaller printing frequency can be used to perform printing, thereby reducing energy consumption. Figure 3a As shown in FIG. 1, when the printing frequency is 25400 / P (P is an integer), the interval distance between two adjacent nozzles in each row can be 25400 / P, i.e., the preset interval L, and the interval distance between the two adjacent nozzles is less than or equal to D' = C*D. Specifically, in the speed direction of the printing plane (i.e., the X direction), the distance between the centers of the projections of the two adjacent nozzles located in the same row is less than or equal to D' = C*D. In this way, when the nozzle plate 200 is used, a smaller printing frequency can be used to perform printing, thereby reducing energy consumption. Figure 3b As shown in FIG. 1, when the printing frequency is 25400 / P (P is an integer), the interval distance between two adjacent nozzles in each row can be 25400 / P, i.e., the preset interval L, and the interval distance between the two adjacent nozzles is less than or equal to D' = C*D. Specifically, in the speed direction of the printing plane (i.e., the X direction), the distance between the centers of the projections of the two adjacent nozzles located in the same row is less than or equal to D' = C*D. In this way, when the nozzle plate 200 is used, a smaller printing frequency can be used to perform printing, thereby reducing energy consumption. Figure 3a In the embodiment, the nozzle plate 200 is provided with one row of first nozzles and one row of second nozzles. Figure 3b In the embodiment, the nozzle plate 200 is provided with one row of first nozzles and one row of second nozzles.

[0089] In the embodiment, the nozzle array further includes at least one row of second nozzles having a second diameter, and the projections of the adjacent second nozzles in the nozzle arrangement direction are arranged uniformly at the preset interval. The projections of the second nozzles in the nozzle arrangement direction relative to the first nozzles are offset by half of the preset interval to form staggered arrangement with the first nozzles.

[0090] Through the staggered arrangement of the first nozzles and the second nozzles, the white area on the printing plane after printing can be effectively reduced. In addition, the first nozzles and the second nozzles can be nozzles of different diameters, such as Figure 3a and Figure 3b In the embodiment, the diameter of the first nozzles is greater than that of the second nozzles. In this way, the white area generated after the liquid droplets are ejected by the first nozzles of larger diameter can be supplemented by the liquid droplets ejected by the second nozzles of smaller diameter, thereby reducing the white area and saving the printing liquid.

[0091] In addition, in another embodiment, the nozzle array includes multiple rows of second nozzles distributed in the nozzle arrangement direction, and the projections of the second nozzles in different rows in the nozzle arrangement direction are offset by the preset interval to form staggered arrangement.

[0092] In some embodiments, the droplet generation device can further comprise a common fluid path connecting the first ejection orifice and the second ejection orifice; and a common transducer to apply energy drive pulses at a predetermined printing frequency to cause the first ejection orifice and the second ejection orifice to form the array of droplet sequences. The common fluid path and the common transducer can save processing cost and form a more compact droplet generation structure.

[0093] In other embodiments, the droplet generation device can further comprise a first fluid path connecting the first ejection orifice; a second fluid path connecting the second ejection orifice; a first transducer to apply energy drive pulses at a predetermined printing frequency to cause the first ejection orifice to form the array of droplet sequences; and a second transducer to apply energy drive pulses at the predetermined printing frequency to cause the second ejection orifice to form the array of droplet sequences. For the first ejection orifice and the second ejection orifice with different sizes of orifice diameters, each of which has a respective optimal hydraulic pressure and optimal frequency, the respective fluid paths and transducers can be set to be more accurate.

[0094] In the embodiments of the present application, the pixel point formed by the droplet ejected from the first ejection orifice on the printing plane has a diameter equal to the product of the diameter of the first ejection orifice and a first predetermined coefficient. In order to minimize the white-out area, the distance between the first ejection orifice and the second ejection orifice in the direction perpendicular to the arrangement of the ejection orifices is equal to the product of the target distance and the first predetermined coefficient, and the target distance is the sum of half of the first diameter and an integer multiple of the first diameter.

[0095] As shown in the sixth schematic view of the front structure of the ejection orifice plate. Figure 4a As shown in the sixth schematic view of the front structure of the ejection orifice plate. Figure 4a As shown in the sixth schematic view of the front structure of the ejection orifice plate.

[0096] d' = C x (D / 2 + N x D)

[0097] wherein C is the first predetermined coefficient, D is the first diameter of the first ejection orifice, (D / 2 + N x D) represents the target distance, and N represents an optional integer constant.

[0098] As shown in the sixth schematic view of the front structure of the ejection orifice plate. Figure 4a As shown in the sixth schematic view of the front structure of the ejection orifice plate. Figure 4b As shown in the sixth schematic view of the front structure of the ejection orifice plate. Figure 4b As shown in the sixth schematic view of the front structure of the ejection orifice plate.

[0099] In the embodiments of the present application, the midpoint of the center line of the projection of the adjacent two first ejection orifices in the projection arrangement direction, the center of one of the two first ejection orifices, and the center of the second ejection orifice adjacent to the projection of the two first ejection orifices form a target triangle; wherein, one of the right angle sides of the target triangle has a length of the product of the first diameter and the first preset coefficient divided by two, the other of the right angle sides of the target triangle has a length of half of the preset interval, and the length of the hypotenuse of the target triangle is less than or equal to half of the sum of the product of the second diameter and the second preset coefficient and the product of the first diameter and the first preset coefficient; wherein, the second preset coefficient is used to represent the calculation relationship between the second diameter and the diameter of the pixel point formed by the droplet ejected from the second ejection orifice on the printing plane.

[0100] That is, the following formula is satisfied:

[0101] (C×D / 2) 2 +(L / 2) 2 ≤[(C×D+C”×D”) / 2] 2 ;

[0102] Wherein, C is the first preset coefficient, C" is the second preset coefficient, D is the first diameter, D" is the second diameter, and L is the preset interval.

[0103] In the embodiments of the present application, when the equation of the formula is established, the pixel point 1 corresponding to the first ejection orifice is tangent in the direction perpendicular to the ejection orifice arrangement direction, and the pixel point 2 corresponding to the second ejection orifice can be tangent, as shown in Figure 5a . In the application of the present embodiment, it is generally used in the following scenarios: the relative transmission direction of the printing plane is perpendicular to the ejection orifice arrangement direction, and the droplet ejection path direction is perpendicular to the printing plane.

[0104] Optionally, the preset interval is L=D'=C*D, and the pixel point corresponding to the first ejection orifice can be tangent in the ejection orifice arrangement direction. According to the above formula, the second diameter is greater than or equal to (√2-1)D; when the second diameter is equal to (√2-1)D, if the pixel point corresponding to the first ejection orifice is tangent in the direction perpendicular to the ejection orifice arrangement direction, the pixel point 1 corresponding to the first ejection orifice and the pixel point 2 corresponding to the second ejection orifice can be tangent, as shown in Figure 5b .

[0105] Based on the above-mentioned droplet generating device, the embodiments of the present application provide a printing device for improving printing uniformity, as shown in Figure 6 , which comprises at least one of the above-mentioned droplet generating device 800 and a relative transmission mechanism 700.

[0106] The droplet generation device 800 is provided with a nozzle array configured to spray liquid; the liquid is driven by energy pulses applied based on a preset printing frequency to form a droplet sequence array.

[0107] The relative transmission mechanism 700 moves the printing plane relative to the droplet generation device 800 in a speed direction to form relative motion; or, the droplet generation device 800 is mounted on the relative transmission mechanism 700, and the relative transmission mechanism drives the droplet generation device 800 to move in a speed direction to form relative motion.

[0108] In the technical scheme provided by the embodiments of the present application, the droplet generation device 800 is provided with a nozzle array. The nozzle array sprays a liquid array, and energy pulses applied on the liquid array can form a droplet sequence array, and then form a pixel point on a printing plane to complete printing.

[0109] In addition, in the technical scheme provided by the embodiments of the present application, the nozzle array includes at least one row of first nozzles with a first diameter, and adjacent first nozzles in the nozzle arrangement direction are uniformly arranged at a preset interval, the preset interval is determined based on the product of the first diameter and a first preset coefficient, so that the projections of adjacent pixel points formed by the droplet sequence array on the printing plane in the nozzle arrangement direction are tangent or intersect; wherein the first preset coefficient is used to represent the calculation relationship between the first diameter and the diameter of the pixel point formed by the liquid droplet sprayed by the first nozzle on the printing plane. Since the adjacent pixel points are tangent or intersect, the white area in the printing area of the printing plane is greatly reduced, and the printing uniformity of the printing plane is improved.

[0110] In some embodiments, in order to reduce the white area, when the printing device sets a row of first nozzles, the preset interval is less than or equal to the product of the first diameter and the first preset coefficient, that is, the preset interval is less than or equal to the diameter of the pixel point corresponding to the row of first nozzles.

[0111] When the printing device sets multiple rows of first nozzles, the preset interval can be less than or equal to the product of the number of first nozzle rows, the first diameter and the first preset coefficient, that is, the preset interval is less than or equal to the product of the number of first nozzle rows and the diameter of the pixel point corresponding to the row of nozzles. In order to improve the yield and pressure bearing capacity of the nozzle plate, the projections of the first nozzles in different rows in the nozzle arrangement direction can be offset at a preset interval to form staggered arrangement, that is, the preset interval is equal to the product of the number of first nozzle rows and the diameter of the pixel point corresponding to the row of first nozzles.

[0112] In the embodiment of the present application, the direction of the liquid ejected by the droplet generating device 800 can be perpendicular to the printing plane, that is, the direction of the liquid is perpendicular to the printing plane. Based on the actual installation, there may be an angle between the liquid of the droplet generating device 800 and the printing plane, that is, on a plane parallel to the arrangement direction of the nozzle holes, there may be an angle between the direction of the liquid and the arrangement direction of the nozzle holes, such as Figure 7 The angle α is shown.

[0113] When the direction of liquid ejection by the droplet generating device 800 is perpendicular to the printing plane, the length of the pixel points corresponding to each row of first nozzles in the nozzle arrangement direction is the product of the first diameter and the first preset coefficient, as shown in the following formula.

[0114] D 11 =C1*D1

[0115] Among them, D 11 is the length of the pixel point corresponding to the first nozzle in the nozzle arrangement direction, C1 is the first preset coefficient, that is, the calculated relationship between the first diameter and the diameter of the pixel point formed by the droplet flowing through the first nozzle vertically sprayed on the printing plane, and D1 is the first diameter.

[0116] When there is an angle α (i.e., the target angle) between the direction in which the droplet generating device 800 sprays liquid and the printing plane, the length of the pixel points corresponding to each row of first nozzles in the nozzle arrangement direction is the product of the first diameter and the first preset coefficient, and the quotient of the sine value of the target angle, as shown in the following formula.

[0117] D 12 =C2*D1

[0118] Among them, D 12 is the length of the pixel point corresponding to the first nozzle in the nozzle arrangement direction, C2 is the first preset coefficient / sinα, D1 is the first diameter, and α is the target angle.

[0119] like Figure 6 As shown, the printing device may include multiple droplet generating devices 800, a support frame assembly 400, and a liquid supply assembly 500. Multiple droplet generating devices 800 are sequentially arranged on the support frame assembly 400 along the speed direction, and the liquid supply assembly 500 is used to provide liquid. The droplet generating device 800 is arranged on the support frame assembly 400, and the first end of the liquid inlet pipe 120 of the droplet generating device 800 is connected to the ink inlet port 111, and the second end of the liquid inlet pipe 120 is connected to the liquid supply assembly 500, so that the liquid inlet pipe 120 passes liquid. The liquid supply assembly 500 provides liquid to the droplet generating device 800, and the droplet generating device 800 produces droplets to print on the substrate 600. The substrate 600 is the surface to be printed, such as fiber or fabric.

[0120] In some embodiments, asFigure 6 As shown, the support frame assembly 400 includes two support frames 410. One of the two support frames 410 is connected with the first side of the plurality of substrates 100 through the first fixing ear 420; the other of the two support frames 410 is connected with the second side of the plurality of substrates 100 through the second fixing ear 430, and the first side and the second side are symmetrical about the fluid slot 110.

[0121] As shown in Figure 8a and Figure 8b shown, the plurality of the droplet generation devices 800 include a plurality of the jet orifice arrays, and the plurality of the jet orifice arrays include the first jet orifice 210 distributed along the jet orifice arrangement direction. The projection of the first jet orifice 210 of different droplet generation devices 800 in the jet orifice arrangement direction is offset by the preset interval to form staggered arrangement. That is, the structure of each droplet generation device 800 can refer to the related description of the above Figures 2a to 2c 、 Figures 3a to 3b and Figure 4a part, which will not be described here.

[0122] In the embodiments of the present application, the jet orifice arrangement direction of the plurality of the droplet generation devices 800 can be perpendicular to the velocity direction, as shown in Figure 8a ; the jet orifice arrangement direction of the plurality of the droplet generation devices 800 can also have an included angle with the velocity direction, as shown in Figure 8b ; the jet orifice arrangement direction of the plurality of the droplet generation devices 800 can also have an included angle θ with the velocity direction.

[0123] In actual application, when the resolution of the jet orifice 210 of the jet orifice plate 200 along the jet orifice arrangement direction is too small, the gap between the jet orifices 210 along the jet orifice arrangement direction is too large, and the substrate 600 will have a white area in the jet orifice arrangement direction, resulting in uneven printing and dyeing. Although increasing the resolution of the jet orifice 210 of the jet orifice plate 200 can improve the printing and dyeing uniformity, it will result in lower yield and lower pressure-bearing capacity of the jet orifice plate 200, lower service life of the jet orifice 210, and easy breakage. The printing equipment provided in the embodiments of the present application can improve the printing and dyeing uniformity without reducing the service life of the jet orifice plate 200.

[0124] In the embodiments of the present application, the positions of the plurality of the droplet generation devices 800 can be exchanged arbitrarily along the velocity direction. For example, the first droplet generation device 800 is R1, the second droplet generation device 800 is R2, and the third droplet generation device is R3. The position arrangement of the three droplet generation devices 800 can be R1-R2-R3, R1-R3-R2, or R2-R1-R3, etc. The diameters of the jet orifices 210 of each droplet generation device 800 can be the same or different.

[0125] Figure 9 The front view structural schematic diagram of the two jet orifice plates 200 provided in the embodiments of the present application is shown in Figure 9As shown, the ejection orifice 210 is circular, the horizontal distance between the centers of the ejection orifice 210 of the first liquid droplet generating device 800 and the ejection orifice 210 of the adjacent second liquid droplet generating device 800 is D 1-2 , the width of the first liquid droplet generating device 800 is W1, the width of the second liquid droplet generating device 800 is W2, and D 1-2 ≥(W1+W2) / 2. Figure 9 In the formula, D1 is the diameter of the ejection orifice 210 of the first liquid droplet generating device 800, D2 is the diameter of the ejection orifice 210 of the second liquid droplet generating device 800, L1 is the spacing (i.e., the preset spacing) of the ejection orifice 210 of the first liquid droplet generating device 800, and L2 is the spacing (i.e., the preset spacing) of the ejection orifice 210 of the second liquid droplet generating device 800.

[0126] Figure 10 The three ejection orifice plates 200 provided in the embodiments of the present application are shown in the front view structural schematic diagram as shown in FIG. 4. Figure 10 As shown, the horizontal distance between the centers of the ejection orifice 210 of the adjacent second liquid droplet generating device and the ejection orifice 210 of the third liquid droplet generating device is D 2-3 , the width of the third liquid droplet generating device 800 is W3, D3 is the diameter of the ejection orifice 210 of the third liquid droplet generating device 800, and L3 is the spacing (i.e., the preset spacing) of the ejection orifice 210 of the third liquid droplet generating device 800.

[0127] In the embodiments of the present application, in order to facilitate the processing of the ejection orifice plate and reduce the processing failure of the ejection orifice plate, the ejection orifice plates of different liquid droplet generating devices can have the same arrangement structure of ejection orifices, i.e., the ejection orifices of different ejection orifice plates are arranged at the same positions in the ejection orifice arrangement direction. The diameters of the ejection orifices of different ejection orifice plates can be the same or different, and the widths of the ejection orifice plates of different ejection orifice plates can be equal or different. As shown in FIG. 4, the ejection orifice plates with the same diameter of ejection orifices can be used in different liquid droplet generating devices. In this case, in order to ensure the uniformity of printing, the ejection orifices of multiple ejection orifice plates can be arranged in a staggered manner, i.e., multiple liquid droplet generating devices can be arranged in a staggered manner, as shown in FIGS. 5 and 6. Figure 2a Figure 11a Figure 11b

[0128] Multiple ejection orifice plates 200 are provided with one column of ejection orifices 210 along the ejection orifice arrangement direction, and the ejection orifices 210 of multiple ejection orifice plates 200 are arranged in a staggered manner along the ejection orifice arrangement direction, so that the liquid droplets ejected by multiple ejection orifice plates 200 are tangent or intersected along the ejection orifice arrangement direction. By arranging the ejection orifices 210 of different ejection orifice plates 200 in a staggered manner along the ejection orifice arrangement direction, a higher printing resolution in the ejection orifice arrangement direction (e.g., the Y direction) can be achieved on the ejection orifice plate 200 with a low resolution of ejection orifices 210, and the processing difficulty of the ejection orifices 210 can be reduced, the damage of the ejection orifice plate 200 can be avoided, and the processing qualification rate of the ejection orifice plate 200 can be improved.

[0129] ​​​For example: In order to achieve a printing resolution of 600dpi in the nozzle arrangement direction, it is necessary to process 600 nozzles within a 1-inch range in the nozzle arrangement direction of a nozzle plate. By processing a row of 300 nozzles within a 1-inch range in the nozzle arrangement direction of two nozzle plates, and then staggering the nozzles of the two nozzle plates, that is, each nozzle of one nozzle plate is in the middle of the adjacent nozzle holes in the other nozzle plate, a printing resolution of 600dpi in the nozzle arrangement direction can be achieved without processing 600 nozzles on one nozzle plate. Of course, by staggering the nozzles of multiple nozzle plates, higher printing resolutions such as 2400dpi and 600dpi can be achieved.

[0130] In the embodiment of the present application, the preset spacings of different droplet generating devices may be the same or different.

[0131] Printing equipment uses Figure 11a Take the two rows of nozzle plates as an example. The nozzle diameters of the two rows of nozzle plates are the same, and the corresponding pixel diameters are the same. The distance W between the two rows of nozzle plates is twice the pixel diameter. Figure 11a When the two rows of nozzle plates are printing, the pixel points formed on the printing plane are as follows: Figures 12a to 12e As shown, Figures 12a to 12e In the figure, a row of pixels represented by a dotted circle corresponds to one nozzle plate, a row of pixels represented by a solid circle corresponds to another nozzle plate, a solid circle represents printed pixels, and a hollow circle represents unprinted pixels. Figures 12a to 12e In the Y direction (i.e., the nozzle arrangement direction), the pixel points formed by the two nozzle plates are staggered and tangent, which can be achieved by adjusting the nozzle spacing; in the X direction (i.e., the speed direction), the pixel points formed by each nozzle plate are tangent respectively, which can be achieved by adjusting the relative transmission speed of the printing plane.

[0132] Figures 12a to 12e The schematic diagrams of the pixel points formed after the printing plane is printed at t1, t2, t3, t4, and t5 are shown in sequence. Figures 12a to 12e It can be seen that the staggered setting of the nozzle holes of the nozzle plate reduces the nozzle hole resolution of a single nozzle plate and reduces the difficulty of nozzle plate processing, while improving the uniformity of printing on the printing plane in the X and Y directions.

[0133] In some embodiments, as Figure 6As shown, the printing device can further include a control device 810, which is communicatively connected with the controller of each droplet generating device 800 and the relative transmission mechanism 700. It should be noted that the control device 810 can be communicatively connected with the controller of each droplet generating device 800 and the relative transmission mechanism 700 in a wireless manner or in a wired manner. When printing, the control device 810 controls the movement speed of the relative transmission mechanism 700 relative to the droplet generating device 800 in the speed direction, or controls the relative transmission mechanism 700 to drive the printing module 800 to move in the speed direction, and controls the pressure and energy driving pulse inside the droplet generating device 800 to form the droplet sequence array.

[0134] In the embodiments of the present application, in order to accurately control the liquid amount of the substrate 600, a plurality of droplet generating devices 800 can be arranged on the printing device. The control device 810 can control the plurality of droplet generating devices 800 to work simultaneously, or control part of the droplet generating devices 800 to work, and the present application does not make any limitation in this regard.

[0135] In the embodiments of the present application, the relative transmission mechanism 700 can transport the printing plane in the speed direction, or control the droplet generating device 800 to move in the speed direction, and the present application does not make any limitation in this regard.

[0136] Taking the relative transmission mechanism 700 that can transport the printing plane in the speed direction as an example, in the embodiments of the present application, the relative transmission mechanism 700 can be implemented in the following two structures:

[0137] In structure one, the relative transmission mechanism 700 includes a transmission assembly and a driving assembly. The surface of the transmission assembly is a plane, and the substrate 600 is placed on the surface of the transmission assembly. The driving assembly is arranged at both ends of the transmission assembly and is configured to drive the transmission assembly to move in the speed direction, so that the transmission assembly drives the substrate 600 to move in the speed direction, that is, the transmission assembly drives the printing plane to move in the first direction.

[0138] In order to ensure that the transmission assembly drives the printing plane to move, the surface roughness of the transmission assembly is greater than a preset roughness. The preset roughness can be set according to actual needs. In some embodiments, the surface material of the transmission assembly can be rubber, plastic or other materials, so as to reduce the equipment cost.

[0139] The structure one can be a conveyor belt or a guide belt. At this time, the substrate 600 can be placed on the conveyor belt or the guide belt, and the conveyor belt drives the substrate 600 to move in the speed direction.

[0140] In structure two, the relative conveying mechanism 700 comprises two conveying roller mechanisms; each conveying roller mechanism comprises two conveying rollers, the substrate 600 passes between the two conveying rollers comprised by each conveying roller mechanism, and the two conveying rollers comprised by each conveying roller mechanism roll against each other to drive the substrate to move in the first direction, i.e. to drive the printing plane to move in the speed direction.

[0141] In the embodiments of the present application, the relative conveying mechanism 700 can also be implemented in other ways as long as the printing plane is moved in the speed direction.

[0142] To improve the uniformity of printing, the controller can control the pressure and energy driving pulse inside the droplet generating device 800 for a period of time, and then control the relative conveying mechanism 700 to move relative to the droplet generating device 800 in the speed direction.

[0143] For example, after the substrate 100 vibrates for 5-10 seconds, the substrate 600 is moved by the relative conveying mechanism 700 so that the droplets perform printing on the substrate 600. After the substrate 100 vibrates for 5-10 seconds, the droplet sequence array can be stably generated by the droplet generating device 800. The printing performed on the substrate 600 by the stably generated droplet sequence array can improve the uniformity of printing.

[0144] In some embodiments, the "the jet orifice array comprises at least one row of first jet orifices with a first diameter, and the projections of adjacent first jet orifices in the jet orifice arrangement direction are uniformly arranged at a preset interval" is replaced by "the plurality of droplet generating devices have a plurality of jet orifice arrays, any one of the jet orifice arrays has at least one row of first jet orifices with a first diameter, and the projections of the first jet orifices on different droplet generating devices in the jet orifice arrangement direction are uniformly arranged at a preset interval". The replacement scheme has the same inventive concept as the original scheme, and both use the tangency or intersection of pixel points in the jet orifice arrangement direction as a solution to improve uniformity. Since the installation positions of different droplet generating devices can be adjusted, more flexibility is provided for adjusting the positions of pixel points or freely combining the relationships between pixel points. In addition, the problem of insufficient accuracy of jet orifice processing of the droplet generating device can be solved to reduce production costs. Moreover, the structure is simple, and it is easier to maintain and replace.

[0145] In some embodiments, the printing device can further comprise other droplet generating devices, the other droplet generating devices are provided with a jet orifice array, the jet orifice array on the other droplet generating devices comprises at least one row of second jet orifices with a second diameter, and the projections of adjacent second jet orifices in the jet orifice arrangement direction are uniformly arranged at the preset interval; wherein the projections of the second jet orifices relative to the projections of the first jet orifices of the droplet generating devices in the jet orifice arrangement direction are offset by half of the preset interval to form staggered arrangement with the first jet orifices.

[0146] The present scheme has flexibility in adjustment. The installation configuration is adjusted according to the liquid droplet generating device with different nozzle arrays, which can compensate for the problem of insufficient accuracy of nozzle processing of the liquid droplet generating device, so as to reduce the production cost. Moreover, the structure is simple, and it is easier to maintain and replace. In the embodiment of the present application, the liquid droplet generating device 800 and other liquid droplet generating devices are installed in the manner shown in the figure. The projection of the second nozzle 210 of the other liquid droplet generating device along the nozzle arrangement direction is located in the gap between the adjacent nozzles 210 of the liquid droplet generating device 800. The working pressure and the working frequency of the liquid droplet generating device 800 and the other liquid droplet generating device can be the same or different. Figure 8a Or Figure 8b The present scheme has flexibility in adjustment. The installation configuration is adjusted according to the liquid droplet generating device with different nozzle arrays, which can compensate for the problem of insufficient accuracy of nozzle processing of the liquid droplet generating device, so as to reduce the production cost. Moreover, the structure is simple, and it is easier to maintain and replace. In the embodiment of the present application, the liquid droplet generating device 800 and other liquid droplet generating devices are installed in the manner shown in the figure. The projection of the second nozzle 210 of the other liquid droplet generating device along the nozzle arrangement direction is located in the gap between the adjacent nozzles 210 of the liquid droplet generating device 800. The working pressure and the working frequency of the liquid droplet generating device 800 and the other liquid droplet generating device can be the same or different.

[0147] In addition, in the technical scheme provided in the embodiment of the present application, based on the configuration parameters and the printing frequency of the liquid droplet generating device, the relative transmission speed between the printing plane and the liquid droplet generating device is determined and controlled, so that the adjacent pixel points corresponding to each group of liquid droplet generating devices are tangent or intersected in the relative transmission direction. Since the adjacent pixel points are tangent or intersected, the white area in the printing area of the printing plane is greatly reduced, and the printing uniformity of the printing plane is improved.

[0148] It should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0149] Each embodiment in the specification is described in a relevant manner, and the same and similar parts between each embodiment can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the printing device embodiment, since it is basically similar to the liquid droplet generating device embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the description of the liquid droplet generating device embodiment.

[0150] The above only describes the preferred embodiments of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A droplet generation device for printing droplets on a printing plane, the device comprising: an array of orifices, the array of orifices comprising at least one row of first orifices having a first diameter, and adjacent first orifices in the array of orifices are arranged at a predetermined spacing in a projection of the array of orifices, the predetermined spacing being determined based on a product of the first diameter and a first predetermined coefficient, such that a projection of adjacent pixel points formed by the array of droplets on the printing plane in the projection of the array of orifices is tangent or intersecting; wherein the first predetermined coefficient is used to represent a calculation relationship between the first diameter and a diameter of a pixel point formed by a droplet jetted from the first orifice on the printing plane. 2.The device of claim 1, wherein the array of orifices comprises a plurality of rows of first orifices distributed along the projection of the array of orifices, and the projection of first orifices in different rows are offset by the predetermined spacing to form a staggered arrangement. 3.The device of claim 1, wherein the array of orifices further comprises at least one row of second orifices having a second diameter, and adjacent second orifices in the array of orifices are arranged at the predetermined spacing in the projection of the array of orifices; and the projection of the second orifices relative to the projection of the first orifices is offset by half of the predetermined spacing to form a staggered arrangement with the first orifices. 4.The device of claim 3, wherein the array of orifices comprises a plurality of rows of second orifices distributed along the projection of the array of orifices, and the projection of second orifices in different rows are offset by the predetermined spacing to form a staggered arrangement. Further comprising: a common fluid path connecting the first orifices and the second orifices; and a common transducer applying energy driving pulses at a predetermined printing frequency to drive the first orifices and the second orifices to form the array of droplets. Further comprising: a first fluid path connecting the first orifices; a second fluid path connecting the second orifices; a first transducer applying energy driving pulses at the predetermined printing frequency to drive the first orifices to form the array of droplets; and a second transducer applying energy driving pulses at the predetermined printing frequency to drive the second orifices to form the array of droplets. The first orifices and the second orifices are arranged at a distance in a direction perpendicular to the projection of the array of orifices, and the distance is equal to a product of a target distance and the first predetermined coefficient, the target distance being a sum of half of the first diameter and an integer multiple of the first diameter. A midpoint of a line connecting a center of a circle of a first orifice and a center of a circle of a second orifice adjacent to the first orifice in the projection of the array of orifices, the center of the circle of the first orifice, and the center of the circle of the second orifice form a target triangle. ​ 5. Droplet generation apparatus according to claim 3 or 4, wherein, ​ ​ ​ 6. The droplet generating apparatus of claim 3 or 4, wherein ​ ​ ​ ​ ​ 7. The droplet generating apparatus of claim 3 or 4, wherein ​ 8. The droplet generation device of claim 7, wherein, ​ The length of one of the right-angle sides of the target triangle is the product of half of the first diameter and the first preset coefficient, the length of the other right-angle side of the target triangle is half of the preset interval, and the length of the hypotenuse of the target triangle is less than or equal to half of the sum of the product of the second diameter and the second preset coefficient and the product of the first diameter and the first preset coefficient; the second preset coefficient is used to represent a calculation relationship between the second diameter and the diameter of a pixel point formed by a liquid drop jetted from the second nozzle on a printing plane.

9. A printing apparatus that improves print uniformity, characterized by: Comprise: The liquid drop generating device of any one of claims 1-8; the liquid drop generating device is provided with a nozzle array, the nozzle array comprises at least one row of first nozzles with a first diameter, and adjacent first nozzles in the projection direction of the nozzle array are arranged uniformly at a preset interval, the preset interval is determined based on the product of the first diameter and a first preset coefficient, so that the projections of adjacent pixel points formed by the liquid drop sequence array on the printing plane in the nozzle arrangement direction are tangent or intersected; wherein the first preset coefficient is used to represent a calculation relationship between the first diameter and the diameter of a pixel point formed by a liquid drop jetted from the first nozzle on a printing plane; The relative transmission mechanism transports the printing plane relative to the liquid drop generating device along the speed direction to form relative motion; Or, the liquid drop generating device is mounted on the relative transmission mechanism, and the relative transmission mechanism drives the liquid drop generating device to move along the speed direction to form relative motion.

10. The printing device of claim 9, wherein The printing device comprises a plurality of liquid drop generating devices, and the plurality of nozzle arrays comprise first nozzles distributed along the nozzle arrangement direction, and the projections of the first nozzles of different liquid drop generating devices in the nozzle arrangement direction are offset by the preset interval to form staggered arrangement.

11. The printing device according to claim 9, wherein Further comprising other liquid drop generating devices, the other liquid drop generating devices are provided with nozzle arrays; the nozzle array on the other liquid drop generating device comprises at least one row of second nozzles with a second diameter, and adjacent second nozzles in the projection direction of the nozzle array are arranged uniformly at the preset interval; wherein the projection of the second nozzle relative to the first nozzle in the nozzle arrangement direction is offset by half of the preset interval to form staggered arrangement with the first nozzle.

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