High-speed spraying ink jet system capable of continuously supplying ink

Abstract

The utility model relates to a high-speed spraying ink-jet system capable of continuously supplying ink, and solves the problem that various existing ink-jet printing systems cannot be directly applied to high-speed spraying such as large-area dyeing. The device comprises an ink jet head and a liquid pressure continuous ink supply device, spray holes are formed in the ink jet head, the spray holes are evenly arranged in the first direction, and the minimum distance between the spray holes in the first direction is P; the diameter of the spray hole is D and meets D2 / pgt; 3.5 microns; the liquid pressure continuous ink supply device comprises a liquid source, a pressure source and a pressure controller. The pressure controller is connected with the pressure source and controls the output pressure of the pressure source, and the output pressure is larger than 20 kPa. According to the utility model, the design of combining a large orifice diameter with a plurality of rows of orifices is adopted, stable pressure is provided by fully utilizing a continuous ink supply device, and high-speed spraying of an ink jet system and dyeing uniformity in a large-area dyeing process are ensured by utilizing large ink outlet quantity of the orifices.

Description

Technical Field

[0001] This utility model belongs to the field of inkjet printing technology, and specifically relates to a high-speed inkjet system for continuous ink supply for spraying. Background Technology

[0002] Inkjet printing is a printing technology that ejects ink droplets through a printhead onto a printing surface to form a printed image. Inkjet printing is low-cost and cost-effective, making it one of the most commonly used printing methods. Its primary application is printing graphics, and current development focuses on improving image clarity and precision. To achieve clearer and more refined lines, developers have been dedicated to creating higher-resolution products, from the early 100 dpi to the current 1600 dpi and even higher. Higher resolution requires designing more nozzles within the same printhead size, resulting in finer nozzles. Therefore, current inkjet printer development is moving towards smaller nozzle sizes and lower ink output per print.

[0003] When attempting to apply inkjet printing to high-speed spraying applications such as large-area textile dyeing, the extremely small color difference or coating thickness difference between adjacent color blocks becomes particularly noticeable. In order to improve the uniformity of the spraying, the inkjet printing equipment needs to have a large ink output and higher requirements for the stability of each ink output in order to ensure the uniformity of the spraying.

[0004] Current inkjet printers have two ink supply systems: continuous and on-demand. The existing inkjet printheads are mainly on-demand piezoelectric printheads, which have insurmountable defects when used for dyeing.

[0005] Continuous inkjet printing uses a stable pressure source to provide continuous and stable ink output power and ink volume. However, existing continuous printheads use charge deflection to control the ink output of each ink droplet. That is, a controller is set on the side of the nozzle. The ink droplets carry static electricity. The controller attracts and deflects the ink droplets in nozzles where ink is not needed, allowing the ink droplets to go into a side path for recycling. Therefore, continuous inkjet printheads have an additional control device on the side of the ink nozzles. The nozzles of the printhead can only be set in a single row. Once multiple rows of nozzles are set, the control of adjacent rows of nozzles will become disordered, which limits the ink output.

[0006] On-demand inkjet printing mainly comes in two types. One is foam inkjet printing, which uses high-temperature heating to generate bubbles in a pressure chamber, increasing the pressure and forcing ink out of the nozzles. However, this method of generating pressure through heating and foaming doesn't allow for complete control over the bubble formation; each bubble generation has slight variations. Therefore, not only are there differences in ink output between different nozzles at the same time, but also variations in the amount of ink output from the same nozzle at different times, making uniformity impossible to guarantee. The second type is piezoelectric printing, which uses a flexible, deformable piezoelectric ceramic sheet as a pressure source. The deformation of the piezoelectric ceramic sheet forces ink out of the nozzles. This method also suffers from variations in the material and degree of deformation of the piezoelectric ceramic sheet, resulting in differences between different nozzles and even within the same nozzle. Therefore, while on-demand inkjet printing may not be very noticeable when used for pattern printing against a background, the unevenness of ink output becomes extremely apparent when used for large-area dyeing. Utility Model Content

[0007] This invention addresses the problem that existing inkjet printing systems cannot be directly applied to high-speed spraying applications such as large-area dyeing. It provides a high-speed inkjet system with continuous ink supply, employing a pressure source with continuous ink supply to provide stable pressure and ensure stable and uniform ink supply.

[0008] The technical solution adopted by this utility model to solve its technical problem is: a high-speed inkjet system for continuous ink supply, including an inkjet head, a liquid pressure continuous ink supply device, and nozzles provided on the inkjet head, the nozzles being evenly arranged along a first direction, the minimum spacing of the nozzles along the first direction being P; the diameter of the nozzles is D, and satisfies... Micrometer; the liquid pressure continuous ink supply device includes a liquid source, a pressure source, and a pressure controller; the pressure controller is connected to the pressure source and controls the output pressure of the pressure source, and the output pressure is greater than 20 kPa.

[0009] This system employs a continuous ink supply unit to supply ink to the printhead. The nozzle size and nozzle spacing of the printhead maintain a high ratio, ensuring sufficient nozzle density while also providing a sufficiently large single ink output. The continuous ink supply unit maintains a stable high-voltage output, ensuring a continuous and stable ink supply, providing a stable ink supply for inkjet printing systems used in high-speed coating applications such as large-area dyeing. Because this system is used for high-speed coating applications such as large-area dyeing, each nozzle operates in a continuous ink output state, eliminating the need for charge deflection devices on the side of the nozzles for control.

[0010] Preferably, the liquid source includes a pressure inlet and a liquid outlet. The pressure source is connected to the pressure inlet of the liquid source, and the liquid outlet of the liquid source is connected to the inkjet head. The pressure source is an air pressure source. The air pressure source can be an air compressor, an air pump, a high-pressure gas cylinder, etc.

[0011] Preferably, the pressure source includes a liquid inlet and a pressurized liquid outlet, the liquid inlet of the pressure source being connected to the liquid source, and the pressurized liquid outlet of the pressure source being connected to the inkjet head.

[0012] Preferably, the pressure source is a liquid pump. The liquid pump can be a peristaltic pump, a diaphragm pump, a gear pump, etc.

[0013] Preferably, the inkjet head includes a substrate, and at least one chip is disposed on the surface of the substrate;

[0014] Each chip is a non-spliced ​​integral structure with several spray holes on its surface and at least one pressure chamber on its back side. The spray holes are connected to the at least one pressure chamber. The cross-sectional area of ​​the pressure chamber perpendicular to the chip surface is more than three times the cross-sectional area of ​​the spray holes.

[0015] The substrate is a non-spliced ​​integral structure with flow channels on the surface of the substrate and ink inlets on the back or side opposite the surface of the substrate. The flow channels are connected to the ink inlets and the pressure chamber.

[0016] Preferably, the nozzle, pressure chamber, and flow channel are directly connected in a direction perpendicular to the chip surface, without any solid structure obstructing them. The inkjet head of this device adopts a structure where the flow channel, pressure chamber, and nozzle are directly connected, reducing pressure loss and ensuring stable inkjet pressure.

[0017] Preferably, the nozzles and pressure chambers correspond one-to-one. Each nozzle has a first center of symmetry perpendicular to the chip surface, and the corresponding pressure chamber has a second center of symmetry perpendicular to the chip surface. The first and second centers of symmetry overlap. The cross-section of the pressure chamber is more than three times the cross-section of the nozzle, thus buffering pressure fluctuations in the nozzle.

[0018] Preferably, the nozzles on a single chip are arranged in n rows along a second direction perpendicular to the first direction, where n is an integer greater than 1. The spacing between nozzles in the same row is m, and the nozzles in adjacent rows are staggered towards the same side along the first direction by a distance equal to the spacing. The nozzles in adjacent rows are evenly spaced along the second direction, with a row spacing of H, and satisfy the following conditions: Compared to traditional continuous inkjet printheads, the inkjet head of this device, being used for high-speed spraying such as large-area dyeing, eliminates the need for ink droplet control, as all ink orifices continuously emit ink. Therefore, the charge deflection device on the side of the nozzles is removed. Thus, although continuous ink supply is used, the limitation imposed by the charge deflection device on the nozzles is avoided. The multi-row nozzle design maximizes the nozzle diameter while ensuring the nozzle distribution density in the first direction, further improving ink coverage and enhancing the uniformity of high-speed spraying during large-area dyeing and other processes.

[0019] This invention employs a continuous ink supply device, but the side of the inkjet head's nozzles does not require a charge deflection device. It can adopt a design with a large nozzle diameter and multiple rows of nozzles, making full use of the stable pressure provided by the continuous ink supply device. The large ink output from the nozzles ensures high-speed spraying of the inkjet system during large-area dyeing processes, thus ensuring the uniformity of dyeing. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the first ink supply structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the second ink supply structure of this utility model.

[0023] Figure 3 This is a schematic diagram of an inkjet head structure according to this utility model.

[0024] Figure 4 This is a structural diagram of the single-row nozzle arrangement of the inkjet head of this utility model.

[0025] Figure 5 This is a structural diagram of the double-row nozzle arrangement of the inkjet head of this utility model.

[0026] In the diagram: 100, inkjet head; 110, chip; 111, pressure chamber; 112, nozzle; 120, substrate; 121, flow channel; 122, ink inlet; 200, continuous liquid pressure ink supply device; 210, liquid source; 220, pressure source; 230, pressure controller; 211, pressure inlet; 212, liquid outlet; 221, liquid inlet; 222, pressurized liquid outlet. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0028] Example 1: A high-speed inkjet system for continuous ink supply, such as... Figure 1 As shown. In this example, the inkjet system includes an inkjet head 100 and a liquid pressure continuous ink supply device 200.

[0029] like Figure 1 As shown, the liquid pressure continuous ink supply device 200 includes a liquid source 210, a pressure source 220, and a pressure controller 230. The pressure controller 230 is connected to the pressure source 220 and controls the output pressure of the pressure source, which is greater than 20 kPa. The liquid source 210 includes a pressure inlet 211 and a liquid outlet 212. The pressure source 220 is connected to the pressure inlet 211 of the liquid source 210, and the liquid outlet 212 of the liquid source 210 is connected to the inkjet head 100. The pressure source 220 is a pneumatic source. The pneumatic source can be an air compressor, a pneumatic pump, a high-pressure gas cylinder, etc.

[0030] Inkjet head structure as follows Figure 3 As shown, the inkjet head 100 includes a substrate 120, on which at least one chip 110 is disposed. Each chip is a non-spliced ​​integral structure, with a plurality of nozzles 112 formed on its surface. At least one pressure chamber 111 is formed on the back side of the chip. The nozzles 112 correspond one-to-one with the pressure chambers 111. Each nozzle has a first center of symmetry perpendicular to the chip surface, and the pressure chamber corresponding to the nozzle has a second center of symmetry perpendicular to the chip surface. The first and second centers of symmetry overlap. The substrate is a non-spliced ​​integral structure, with a flow channel on its surface. An ink inlet is formed on the back or side of the substrate opposite to the surface. The flow channel communicates with the ink inlet and with the pressure chamber. The nozzles 112, pressure chamber 11, and flow channel 121 are directly connected in a direction perpendicular to the chip surface, without any solid structure obstruction. The nozzles are uniformly arranged along a first direction, with a minimum spacing of P along the first direction. The nozzle diameter is D, and satisfies the following conditions: Micrometers. There is no charge deflection device on the side of the nozzle.

[0031] like Figure 4 , 5 As shown, the nozzles 112 on a single chip are arranged in n rows along a second direction perpendicular to the first direction, where n is an integer greater than 1. The spacing between nozzles in the same row is m, and the nozzles in adjacent rows are staggered towards the same side along the first direction by a distance equal to the spacing. The nozzles in adjacent rows are evenly spaced along the second direction, with a row spacing of H, and satisfy the following conditions: The nozzle can be as follows: Figure 4 The single-row arrangement shown can also be as follows: Figure 5 The double-row arrangement shown can also be arranged in more than two rows.

[0032] Example 2: A high-speed inkjet system for continuous ink supply, such as... Figure 2 As shown. In this example, the inkjet system includes an inkjet head 100 and a liquid pressure continuous ink supply device 200.

[0033] like Figure 2 As shown, the liquid pressure continuous ink supply device 200 includes a liquid source 210, a pressure source 220, and a pressure controller 230. The pressure controller 230 is connected to the pressure source 220 and controls the output pressure of the pressure source, which is greater than 20 kPa. The pressure source 220 includes a liquid inlet 221 and a pressurized liquid outlet 222. The liquid inlet 221 of the pressure source 220 is connected to the liquid source 210, and the pressurized liquid outlet 222 of the pressure source 220 is connected to the inkjet head 100. The pressure source 220 is a liquid pump, which can be a peristaltic pump, a diaphragm pump, a gear pump, etc.

[0034] In this example, the structure of the inkjet head is the same as in Example 1.

Claims

1. A high-speed inkjet system for continuous ink supply, comprising an inkjet head and a liquid pressure continuous ink supply device, characterized in that: The inkjet head is provided with nozzles, which are evenly spaced along a first direction, and the minimum spacing between the nozzles along the first direction is P; the diameter of each nozzle is D, and it satisfies the following conditions: Micrometer; the liquid pressure continuous ink supply device includes a liquid source, a pressure source, and a pressure controller; The pressure controller is connected to the pressure source and controls the output pressure of the pressure source, wherein the output pressure is greater than 20 kPa.

2. The high-speed inkjet system for continuous ink supply according to claim 1, characterized in that: The liquid source includes a pressure inlet and a liquid outlet. The pressure source is connected to the pressure inlet of the liquid source, and the liquid outlet of the liquid source is connected to the inkjet head. The pressure source is an air pressure source.

3. The high-speed inkjet system for continuous ink supply according to claim 1, characterized in that: The pressure source includes a liquid inlet and a pressurized liquid outlet. The liquid inlet of the pressure source is connected to the liquid source, and the pressurized liquid outlet of the pressure source is connected to the inkjet head.

4. The high-speed inkjet system for continuous ink supply according to claim 3, characterized in that: The pressure source is a liquid pump.

5. The high-speed inkjet system for continuous ink supply according to claim 1, characterized in that: The inkjet head includes a substrate, and at least one chip is disposed on the surface of the substrate. Each chip is a non-spliced ​​integral structure with several spray holes on its surface and at least one pressure chamber on its back side. The spray holes are connected to the at least one pressure chamber. The cross-sectional area of ​​the pressure chamber perpendicular to the chip surface is more than three times the cross-sectional area of ​​the spray holes. The substrate is a non-spliced ​​integral structure with flow channels on the surface of the substrate and ink inlets on the back or side opposite the surface of the substrate. The flow channels are connected to the ink inlets and the pressure chamber.

6. The high-speed inkjet system for continuous ink supply according to claim 5, characterized in that: The nozzle, the pressure chamber, and the flow channel are connected in a straight line perpendicular to the chip surface, without any solid structure obstructing them.

7. The high-speed inkjet system for continuous ink supply according to claim 5, characterized in that: The nozzles correspond one-to-one with the pressure chambers. Each nozzle has a first center of symmetry perpendicular to the chip surface, and the pressure chamber corresponding to the nozzle has a second center of symmetry perpendicular to the chip surface. The first center of symmetry and the second center of symmetry overlap.

8. The high-speed inkjet system for continuous ink supply according to claim 5, characterized in that: The nozzles on a single chip are arranged in n rows along a second direction perpendicular to the first direction, where n is an integer greater than 1. The spacing between nozzles in the same row is m. The nozzles in adjacent rows are staggered towards the same side along the first direction, with the stagger distance being the spacing. The nozzles in adjacent rows are evenly spaced along the second direction, with a row spacing of H, and satisfy the following conditions: .

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