Spraying system for spraying target object
By improving the constant flow liquid supply unit and nozzle design, the problems of high manufacturing cost and low spraying efficiency of traditional nozzles have been solved, achieving high efficiency and low cost spraying effect. In particular, it reduces the discharge of flying liquid and improves the spraying accuracy and uniformity in the process of fabric spraying.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2026-03-27
AI Technical Summary
Traditional spray nozzles suffer from high manufacturing costs and poor spraying efficiency, especially the problem of spraying liquid splatter during the spraying process.
It adopts a constant flow liquid supply unit and printhead design. The printhead includes an ink supply port, a nozzle plate and a flow distribution channel. The nozzle height is 0.1mm to 10mm. The number of nozzles and ink supply ports are reasonably configured to ensure that the liquid to be sprayed is continuously output in the form of a liquid column. The pressure difference of the flow distribution channel is within ±3%. It is combined with an ink mixing unit to mix multiple inks online.
It improves spraying efficiency, reduces fly ash emissions, lowers manufacturing costs, and achieves higher spraying precision and uniformity.
Smart Images
Figure CN224044884U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates generally to inkjet technology, and in particular, to a spraying system for target object spraying. BACKGROUND
[0002] In a spraying head for coloring or spraying a target object (e.g., a fabric), a liquid to be sprayed (e.g., ink) is atomized by, for example, an ultrasonic atomization technology to be inkjet printed on the target object. The atomization of the liquid to be sprayed requires additional energy consumption, and the atomized droplets (e.g., ink droplets) that are not attached to the target object require a matching absorption device to reduce the impact on the environment. The above-mentioned existing spraying head based on the ultrasonic atomization technology requires a transducer configured to achieve ultrasonic atomization and an absorption device configured to absorb the excess atomized ink droplets, thus resulting in a high manufacturing cost, in addition, the efficiency of the atomized spraying liquid coloring or spraying is poor.
[0003] In summary, the conventional spraying head has the following disadvantages: high manufacturing cost, liquid (e.g., ink) emission problem, and poor spraying liquid (e.g., ink) efficiency. SUMMARY
[0004] The present disclosure provides a spraying system for target object spraying, which can improve the spraying efficiency.
[0005] According to one aspect of the present disclosure, a spraying system for target object spraying is provided, comprising: a constant flow liquid supply unit configured to supply a liquid to be sprayed to a spraying head via a supply port on the spraying head at a constant flow rate; and the spraying head comprising at least: a supply port; a nozzle plate, the nozzle plate being configured with a plurality of nozzles, and the height of the nozzles being any value between 0.1 mm (millimeter) and 10 mm; and a flow distribution channel in communication with the supply port, the flow distribution channel comprising a slot at least partially disposed in the nozzle plate, the bottom surface of the slot being in communication with the plurality of nozzles, and the flow distribution channel being configured such that the liquid to be sprayed is output via the nozzles after being pressurized in the flow distribution channel, and the pressure difference of the liquid to be sprayed at different parts of the flow distribution channel is within ±3% when the liquid to be sprayed is output; wherein the flow rate of the constant flow liquid supply unit, the number of supply ports, the height of the nozzles, the number of nozzles, and the inlet size and outlet size of the nozzles are configured such that the liquid to be sprayed is continuously output from the nozzles in the form of a liquid column.
[0006] In some embodiments, the inlet diameter of the nozzles is any value between 0.05 mm and 0.5 mm, and the outlet diameter of the nozzles is any value between 0.04 mm and 0.4 mm.
[0007] In some embodiments, the nozzle plate is configured with one or more rows of nozzles, and the number of nozzles is any value between 100 and 10,000.
[0008] In some embodiments, the flow rate of the constant flow liquid supply unit is any value between 0.05 L / min (liter per minute) and 50 L / min.
[0009] In some embodiments, the number of ink supply ports is any value between 1 and 10, and the inkjet system further comprises a cover plate disposed above the nozzle plate to cover the slots of the manifold.
[0010] In some embodiments, the manifold is configured such that the flow resistance of the liquid to be jetted flowing through the manifold is less than the flow resistance of the liquid flowing through each nozzle, and the height of the manifold is any value between 0.3 mm and 30 mm.
[0011] In some embodiments, the manifold is configured to have a predetermined trajectory that sequentially connects the plurality of nozzles.
[0012] In some embodiments, the bottom surface of the slot is a curved surface, and the opening that communicates with the nozzle is disposed on the curved surface.
[0013] In some embodiments, the nozzle plate is configured with a plurality of rows of nozzles, and the plurality of nozzles in each row are configured to be sequentially staggered.
[0014] In some embodiments, the nozzle comprises a first channel portion, one end of the first channel portion communicating with the slot; and a second channel portion, one end of the second channel portion communicating with the other end of the first channel portion, the other end of the second channel portion being configured to output the liquid to be jetted, and the diameter of the second channel portion being less than the diameter of the first channel portion.
[0015] In some embodiments, the inkjet system further comprises an ink mixing unit configured to mix a plurality of predetermined base color inks and a plurality of functional inks to form the liquid to be jetted, the functional inks including at least one colorless functional ink.
[0016] In some embodiments, the ink mixing unit comprises a plurality of primary ink cartridges configured to respectively contain one of the plurality of predetermined base color inks and one of the plurality of functional inks; a plurality of sets of metering pumps respectively communicating with the plurality of primary ink cartridges and configured to provide the ink from the corresponding primary ink cartridge to a mixing tank; and the mixing tank configured to mix the predetermined base color inks and the functional inks online.
[0017] In some embodiments, the ink mixing unit further comprises a weighing device disposed below the mixing tank and configured to detect the weight of the ink provided to the mixing tank.
[0018] According to embodiments of the present disclosure, in the inkjet system, the flow rate of the constant flow liquid supply unit, the number of ink supply ports, the height of the nozzles, the number of nozzles, and the inlet size and outlet size of the nozzles are configured such that the liquid to be jetted is continuously output from the nozzles in the form of a liquid column, and thus the jetting efficiency can be improved.
[0019] The summary provides a simplified form of the concepts selected to introduce the subject matter, which will be further described below in the detailed description. The summary is not intended to identify key or essential features of the present disclosure, nor is it intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 A schematic view of a spray system for target object spraying of an embodiment of the present disclosure is shown.
[0021] Figure 2 An exploded schematic view of a spray head of an embodiment of the present disclosure is shown.
[0022] Figure 3 A top view schematic view of a nozzle plate of an embodiment of the present disclosure is shown.
[0023] Figure 4 An enlarged view of a portion of Figure 3 is shown.
[0024] Figure 5 A cross-sectional view schematic view of a nozzle plate of an embodiment of the present disclosure is shown.
[0025] Figure 6 An enlarged view of a portion A of Figure 5 is shown.
[0026] Figure 7 An exploded schematic view of a spray head of an embodiment of the present disclosure is shown.
[0027] Figure 8 A top view schematic view of a nozzle plate of an embodiment of the present disclosure is shown.
[0028] Figure 9 A schematic view of a spray system of an embodiment of the present disclosure is shown.
[0029] In the various drawings, like or corresponding elements are denoted by like or corresponding reference numerals. DETAILED DESCRIPTION
[0030] Preferred embodiments of the present disclosure will be described herein below with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the present disclosure to those skilled in the art.
[0031] The term "includes" and its variants are meant to cover non-exclusive inclusions, i.e., that the listed items are among a list of items, but not excluding others. Unless specifically stated, the term "or" means "and / or". The term "based on" means "based, at least in part, on". The term "one example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "a first", "a second", etc. can refer to different or the same objects.
[0032] As mentioned previously, the conventional fabric dyeing method has the disadvantages of high manufacturing cost and poor jetting efficiency, and has the problem of flying liquid (e.g., flying ink) emission.
[0033] To at least partially solve one or more of the above problems and other potential problems, example embodiments of the present disclosure propose a spraying system for target object spraying. The spraying system comprises a constant flow liquid supply unit and a spray head. The constant flow liquid supply unit is configured to supply a liquid to be sprayed to the spray head via a supply port on the spray head at a constant flow rate. The spray head comprises at least a supply port, a nozzle plate, and a shunt flow channel. The nozzle plate is configured with a plurality of nozzles, and the height of the nozzles is any value between 0.1 mm and 10 mm. The shunt flow channel is in communication with the supply port and comprises at least one groove disposed in the nozzle plate, and the bottom surface of the groove is in communication with the plurality of nozzles. The shunt flow channel is configured such that the liquid to be sprayed is output via the nozzles after being pressurized in the shunt flow channel, and the pressure difference of the liquid to be sprayed at different positions in the shunt flow channel is within ±3% when the liquid to be sprayed is output. The flow rate of the constant flow liquid supply unit, the number of supply ports, the height of the nozzles, the number of nozzles, and the inlet and outlet sizes of the nozzles are configured such that the liquid to be sprayed is continuously output from the nozzles in the form of a liquid column. This can effectively improve the spraying efficiency.
[0034] Figure 1 A schematic diagram of a spraying system 1100 for target object spraying according to an embodiment of the present disclosure is shown. Figure 2 An exploded schematic diagram of a spray head 1104 according to an embodiment of the present disclosure is shown. For ease of understanding, the positive directions of the X-axis, Y-axis, and Z-axis are shown by arrows. Figure 3 A top view schematic diagram of a nozzle plate 1142 according to an embodiment of the present disclosure is shown. Figure 4 An enlarged schematic diagram of a portion of Figure 3 An enlarged schematic diagram of a portion A of Figure 5 A cross-sectional schematic diagram of a nozzle plate 1142 according to an embodiment of the present disclosure is shown. Figure 6 An enlarged schematic diagram of a portion A of Figure 5 An enlarged schematic diagram of a portion A of Figure 1As shown, the spraying system 1100 comprises at least a constant flow liquid supply unit 1102, a spray head 1104, for example. In some embodiments, the spraying system 1100 further comprises an ink mixing unit 1106 for mixing a plurality of predetermined base color inks and a plurality of functional inks, at least one of which is colorless, to form the liquid to be sprayed on line.
[0035] The constant flow liquid supply unit 1102 is configured to supply the liquid to be sprayed to the spray head 1104 via the ink supply port 1141 of the spray head 1104 at a constant flow rate. The constant flow liquid supply unit 1102 comprises an ink tank 1124, a pump 1123, a pressure tank 1122, and a pressure regulating valve 1121, for example. The pump 1123 is a constant flow pump, for example. The ink tank 1124, the pump 1123, the pressure tank 1122, and the pressure regulating valve 1121 are in communication via pipelines. The constant flow liquid supply unit 1102 supplies the liquid to be sprayed to the spray head 1104 via the ink supply port 1141 of the spray head 1104 at a constant flow rate through the driving of the pump 1123 and the cooperation of the pressure tank 1122 and the pressure regulating valve 1121.
[0036] The spray head 1104 comprises an ink supply port 1141, a nozzle plate 1142, and a shunt flow channel 1143, for example. The spray head 1104 further comprises a cover plate 1145 and a pressing plate 1146, for example. The nozzle plate 1142 is provided with a plurality of nozzles 1144, and the height H1 of the nozzles 1144 is any value between 0.1 mm and 10 mm.
[0037] The shunt flow channel 1143 is in communication with the ink supply port 1141. The ink supply port 1141 is in abutment with the nozzle plate 1142 to communicate with the shunt flow channel 1143, for example. The number of ink supply ports 1141 is any value between 1 and 10. Two ink supply ports 1141 are shown in the figure, and each of the two ink supply ports 1141 is in communication with one end of the shunt flow channel 1143. In some embodiments, only one ink supply port 1141 can be provided. In some embodiments, more than two ink supply ports 1141 can be provided. The ink supply port 1141 can be in communication with the shunt flow channel 1143 at any position of the shunt flow channel 1143.
[0038] The shunt flow channel 1143 comprises a groove at least partially disposed in the nozzle plate, and the bottom surface of the groove is in communication with the plurality of nozzles 1144. The shunt flow channel 1143 is configured such that the liquid to be sprayed is output via the nozzles after being pressurized in the shunt flow channel, and the pressure difference of the liquid to be sprayed at different positions of the shunt flow channel is within ±3% when the liquid to be sprayed is output.
[0039] In some embodiments, a cover plate 1145 is disposed above the nozzle plate 1142 to cover the slots in the nozzle plate 1142. A pressing plate 1146 is disposed above the cover plate 1145, for example, and can be secured to the cover plate 1145 and the nozzle plate 1142, for example, by bolts 1147. The cover plate 1145 can be a rubber plate, for example, to provide a sealing function.
[0040] In some embodiments, the cover plate 1145 is a flat plate, and thus the slots in the nozzle plate 1142 correspond to the flow dividing channels 1143.
[0041] In some embodiments, the lower surface of the cover plate 1145 (i.e., the surface closer to the nozzle plate 1142) is provided with slots corresponding to the slots in the nozzle plate 1142. Thus, the slots in the nozzle plate 1142 form a first portion of the flow dividing channels 1143, and the slots in the cover plate 1145 form a second portion of the flow dividing channels 1143, and the first and second portions together form the flow dividing channels 1143. That is, the flow dividing channels 1143 include a first portion in the nozzle plate 1142 and a second portion in the cover plate 1145.
[0042] The flow rate of the constant flow liquid supply unit 1102, the number of ink supply ports 1141, the height H1 of the nozzles 1144, the number of nozzles 1144, and the inlet and outlet dimensions of the nozzles 1144 are configured such that the liquid to be ejected is continuously output from the nozzles 1144 in the form of a liquid column.
[0043] In some embodiments, the inlet diameter of the nozzles 1144 is any value between 0.05 mm and 0.5 mm, and the outlet diameter of the nozzles 1144 is any value between 0.04 mm and 0.4 mm. It should be understood that the inlet of the nozzles 1144 is the port that communicates with the flow dividing channels 1143, and the outlet of the nozzles 1144 is the port from which the liquid to be ejected is ejected.
[0044] For example, in some embodiments, the inlet diameter of the nozzles 1144 is equal to the outlet diameter of the nozzles 1144.
[0045] In some embodiments, the inlet diameter of the nozzles 1144 is greater than the outlet diameter of the nozzles 1144. In some embodiments, the nozzles 1144 are conical, for example.
[0046] In some embodiments, the nozzle 1144 comprises a first channel portion 1441 and a second channel portion 1442. The first channel portion 1441 has one end in communication with the shunt flow passage 1143, and the second channel portion 1442 has one end in communication with the other end of the first channel portion 1441 and the other end for outputting the liquid to be sprayed, and the diameter of the second channel portion 1442 is smaller than the diameter of the first channel portion 1441. The diameter of the first channel portion 1441 is, for example, any value between 0.05 mm and 0.5 mm, and the diameter of the second channel portion 1442 is, for example, any value between 0.04 mm and 0.4 mm.
[0047] The nozzle plate 1142 is provided with one or more rows of nozzles 1144. The number of nozzles 1144 is, for example, any value between 100 and 10,000.
[0048] The flow rate of the constant flow liquid supply unit 1102 is, for example, any value between 0.05 L / min and 50 L / min. In some embodiments, the flow rate of each nozzle 1144 is, for example, 4 ml / min, the number of nozzles 1144 is, for example, 10,000, and the flow rate corresponding to the constant flow liquid supply unit 1102 is, for example, 40 L / min. In some embodiments, the flow rate of each nozzle 1144 is, for example, 0.5 ml / min, the number of nozzles 1144 is, for example, 100, and the flow rate corresponding to the constant flow liquid supply unit 1102 is, for example, 0.05 L / min.
[0049] The shunt flow passage 1143 is configured such that the flow resistance of the liquid to be sprayed flowing through the shunt flow passage 1143 is smaller than the flow resistance of the liquid to be sprayed flowing through each nozzle 1144. The flow resistance of the nozzle 1144 is, for example, the flow resistance of the second channel portion 1442 and the first channel portion 1441 together, or the sum of the flow resistance of the second channel portion 1442 and the flow resistance of the first channel portion 1441. In some embodiments, the cross-sectional area of the shunt flow passage 1143 in the direction of the liquid to be sprayed flowing through the shunt flow passage 1143 is larger than the cross-sectional area of the nozzle 1144 in the direction of the liquid to be sprayed flowing through the nozzle 1144, so that the flow resistance of the liquid to be sprayed flowing through the shunt flow passage 1143 is smaller than the flow resistance of the liquid to be sprayed flowing through each nozzle 1144.
[0050] In some embodiments, the height of the shunt flow passage 1143 is, for example, any value between 0.3 mm and 30 mm. The shape and size of the cross section of the shunt flow passage 1143 in the direction of the liquid to be sprayed flowing through the shunt flow passage 1143 remain substantially constant, and the difference in pressure experienced by the liquid to be sprayed at different locations of the shunt flow passage is within ±3% when the liquid to be sprayed is output.
[0051] In some embodiments, the shunt flow channel 1143 is configured to have a predetermined trajectory that sequentially connects the plurality of nozzles 1144. For example, the predetermined trajectory that the shunt flow channel 1143 has is in a reciprocating meandering shape that sequentially connects all of the nozzles 1144. In this case, one ink supply port 1141 is in communication with one end of the shunt flow channel 1143, and another ink supply port 1141 is in communication with the other end of the shunt flow channel 1143.
[0052] When supplying ink, the constant flow liquid supply unit 1102 can first supply the liquid to be sprayed into the inkjet head 1104 from one ink supply port 1141. Because the flow resistance of the liquid to be sprayed flowing through the shunt flow channel 1143 is smaller than the flow resistance of the liquid to be sprayed flowing through each nozzle 1144, after the liquid to be sprayed enters the shunt flow channel 1143 of the inkjet head 1104 from one ink supply port 1141, the liquid to be sprayed will preferentially flow along the shunt flow channel 1143 and will not tend to enter the nozzles 1144. Therefore, the liquid to be sprayed sequentially traverses the positions in the shunt flow channel 1143 corresponding to each nozzle 1144 along the trajectory of the shunt flow channel 1143, and finally reaches the other ink supply port 1141. In this process, the gas in the shunt flow channel 1143 is completely exhausted, and the shunt flow channel 1143 is filled with the liquid to be sprayed. Next, the liquid to be sprayed is supplied into the inkjet head 1104 again via the ink supply port 1141. Because the shunt flow channel 1143 is already filled with the liquid to be sprayed, under the action of pressure, the liquid to be sprayed is continuously output in the form of a liquid column via the nozzles 1144.
[0053] It should be noted that the number of ink supply ports 1141 can be multiple. In the process of exhausting the gas in the shunt flow channel 1143, for example, two ink supply ports 1141 at the two ends of the shunt flow channel 1143 can be used, and the other ink supply ports 1141 are blocked. After the gas in the shunt flow channel 1143 is exhausted, multiple ink supply ports 1141 can be used to simultaneously supply the liquid to be sprayed into the inkjet head 1104.
[0054] The nozzle plate 1142 is configured with multiple rows of nozzles 1144, and the multiple nozzles 1144 in each row of nozzles 1144 are configured to be sequentially staggered. For example, the straight line on which each row of nozzles 1144 is located has a predetermined angle with the Y-axis, for example, any value between 5 degrees and 15 degrees. For example, adjacent two rows of nozzles 1144 have a predetermined distance. For example, when the spraying system 1100 is in the process of implementing spraying, the multiple nozzles 1144 in each row of nozzles 1144 are configured to be sequentially staggered, which can make the multiple nozzles 1144 compensate for the predetermined distance between adjacent two rows of nozzles 1144, so as to achieve the target spraying precision. The spraying precision can be characterized by DPI (Dots Per Inch).
[0055] Figure 7An exploded schematic view of a showerhead 1104 is shown. For ease of understanding, the positive directions of the X-axis, Y-axis and Z-axis are shown by arrows. Figure 8 A top view of a nozzle plate 1142 is shown. The manifold 1143 includes a main flow channel 1431 and a plurality of branch flow channels 1432. The main flow channel 1431 is straight and connects two ports of the manifold 1143. The branch flow channels 1432 are also straight. Each of the branch flow channels 1432 connects to a plurality of nozzles 1144 in a row of nozzles 1144. Each of the branch flow channels 1432 is in communication with the main flow channel 1431.
[0056] Figure 9 A schematic view of a portion of a printing system 1100 is shown. The printing system 1100 also includes an ink mixing unit 1106 for mixing a plurality of predetermined base color inks and a plurality of functional inks, including at least one colorless functional ink, to form a liquid to be printed.
[0057] The ink mixing unit 1106 includes a plurality of primary ink cartridges 11061, a plurality of sets of metering pumps 11062, and a mixing tank 11063. The ink mixing unit 1106 can also include a weighing device 11065.
[0058] The plurality of primary ink cartridges 11061 are configured to hold a plurality of predetermined base color inks and a plurality of functional inks. The plurality of sets of metering pumps 11062 are in communication with the plurality of primary ink cartridges 11061 and are configured to provide the inks from the corresponding primary ink cartridges 11061 to the mixing tank 11063. The mixing tank 11063 includes an agitator 11064 configured to mix the predetermined base color inks and the functional inks. The mixed inks are provided to an ink tank 1124 or to secondary ink cartridges. An electromagnetic valve and a pump can be provided between the mixing tank 11063 and the ink tank 1124.
[0059] The weighing device 11065 is disposed below the mixing tank 11063 and is configured to detect the weight of the inks provided to the mixing tank 11063.
[0060] In some embodiments, the ink mixing unit 1106 includes a plurality of channels, such as a first channel CH-1, a second channel CH-2, a third channel CH-3, a fourth channel CH-4, an nth channel CH-n, etc. Each channel includes a primary ink cartridge 11061, a metering pump 11062, a pressure gauge 11066, an electromagnetic valve 11067, and a flow meter 11068. Each channel can provide one predetermined base color ink or one functional ink.
[0061] Regarding the functional ink, it is colorless, and is used to mix with a plurality of predetermined base color inks to form the ink to be jetted. In some embodiments, the functional ink includes: a dye solvent, a dye co-solvent, a wet diffusion agent, and a surfactant. Among them, the dye solvent is used to dissolve the plurality of predetermined base color inks in the ink to be jetted, and accounts for 20-30% of the weight of the functional ink. The dye co-solvent accounts for 1-10% of the weight of the functional ink. The wet diffusion agent accounts for 0.1-2% of the weight of the functional ink. The surfactant accounts for 0.1-1% of the weight of the functional ink, and the other components of the functional ink are water. In some embodiments, the functional ink further includes a PH adjuster and a bactericide. The PH adjuster accounts for 0.01-0.1% of the weight of the functional ink. The bactericide accounts for 0.01-0.1% of the weight of the functional ink. In some embodiments, the dye solvent is one or more of ethylene glycol, propylene glycol, glycerol, diethylene glycol, dipropylene glycol, triethylene glycol, 1,2-pentanediol, and isopentyl glycol. The dye co-solvent is one or more of urea, diethylene glycol ether, thiodiethylene glycol, N-methyl formamide, 2-pyrrolidone, caprolactam, polyethylene glycol, polypropylene glycol, acrylate copolymer, lignin sulfonate, sodium methyl naphthalene sulfonate, and sodium methylene disulfonate. The wet diffusion agent is one or more of fatty alcohol polyoxyethylene ether, polyoxyethylene sorbitan ester, and maleic acid diisooctyl ester sulfonate. The surfactant is, for example, an acetylenic diol or a polyether siloxane surfactant. It should be understood that the functional ink can be rapidly penetrated by the plurality of predetermined base color inks, instantaneously dissolve the predetermined base color inks, and drive the predetermined base color inks to penetrate the other side of the target fabric. In some embodiments, different predetermined base color inks can penetrate the bottom of the target fabric at the same speed under the action of the functional ink, so as to make up for the problem of different dye penetration caused by the difference in the R f value, or RF value or R f value) of the predetermined base color inks under the condition of low liquid carrying rate, so as to achieve the effect of color matching of the front and back of the target fabric.
[0062] Regarding the functional ink, it is, for example but not limited to, a colorless diluent, which is configured to increase the penetration of the ink jetted on the target fabric, and to dilute the concentration of the plurality of predetermined base color inks.
[0063] With respect to the plurality of predetermined base color inks, in some embodiments, the color variety of the predetermined base color inks included therein is, for example, no more than four. In some embodiments, the color variety of the predetermined base color inks is, for example, three or four. For example, the predetermined base color inks include, for example, a first predetermined base color, a second predetermined base color, and a third predetermined base color. The three predetermined base color inks are, for example, three primary color inks, i.e., a red ink, a yellow ink, and a blue ink. It should be appreciated that by having the color variety of the predetermined base color inks included in the plurality of predetermined base color inks no more than four, the target color after mixing with the functional ink can be purer. In other embodiments, the plurality of predetermined base color inks include, for example, CMYK (i.e., cyan, magenta, yellow, and black) four color inks.
[0064] The foregoing description of the various embodiments has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the various embodiments to the precise form disclosed. Many modifications and variations are possible in light of the above teaching. It was chosen and described in order to provide the best illustration of the principles of the various embodiments and its practical application, and to thereby enable others skilled in the art to
[0065] The above merely illustrates optional embodiments of the present disclosure, and is not intended to limit the present disclosure. The present disclosure can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.
Claims
1. A spray system for spray painting of a target object, characterized in that The application relates to a liquid ejection system comprising: a constant flow liquid supply unit configured to supply liquid to be ejected to a liquid ejection head via a supply port on the liquid ejection head at a constant flow rate; and the liquid ejection head comprising: the supply port; a nozzle plate configured with a plurality of nozzles, wherein the height of the nozzles is any value between 0.1 mm and 10 mm; and a flow distribution channel in communication with the supply port, the flow distribution channel comprising a slot at least partially disposed in the nozzle plate, a bottom surface of the slot being in communication with the plurality of nozzles, and the flow distribution channel being configured such that the liquid to be ejected is output via the nozzles after being pressurized in the flow distribution channel, and the difference in pressure of the liquid to be ejected at different locations in the flow distribution channel is within + / - 3% when the liquid to be ejected is output; wherein the flow rate of the constant flow liquid supply unit, the number of supply ports, the height of the nozzles, the number of nozzles, and the inlet size and outlet size of the nozzles are configured such that the liquid to be ejected is continuously output from the nozzles in the form of liquid columns. The inlet diameter of the nozzles is any value between 0.05 mm and 0.5 mm, and the outlet diameter of the nozzles is any value between 0.04 mm and 0.4 mm.
2. The spray system of claim 1, wherein, The nozzle plate is configured with one or more rows of nozzles, and the number of nozzles is any value between 100 and 10,000.
3. The spray system of claim 1, wherein, The flow rate of the constant flow liquid supply unit is any value between 0.05 L / min and 50 L / min.
4. The spray system of claim 1, wherein, The number of supply ports is any value between 1 and 10, and the liquid ejection system further comprises:
5. The spray system of claim 1, wherein, a cover plate disposed above the nozzle plate and configured to cover the slot of the flow distribution channel. The flow distribution channel is configured such that the flow resistance of the liquid to be ejected flowing through the flow distribution channel is less than the flow resistance of the liquid to be ejected flowing through each nozzle.
6. The spray system of claim 1, wherein, The height of the flow distribution channel is any value between 0.3 mm and 30 mm. The flow distribution channel is configured to have a predetermined trajectory that sequentially connects the plurality of nozzles.
7. The spray system of claim 1, wherein, The bottom surface of the slot is a curved surface, and the curved surface is provided with an opening in communication with the nozzles.
8. The spray system of claim 1, wherein, The nozzle plate is configured with a plurality of rows of nozzles, and the plurality of nozzles in each row are sequentially staggered.
9. The spray system of claim 1, wherein, The nozzle comprises:
10. The spray system of claim 1, wherein, a first channel portion, one end of the first channel portion being in communication with the slot; a second channel portion, one end of the second channel portion being in communication with the other end of the first channel portion, the other end of the second channel portion being configured to output the liquid to be ejected, and the diameter of the second channel portion being smaller than the diameter of the first channel portion.