An inkjet system and method based on color detection

Abstract

This invention discloses an inkjet system and method based on color detection, relating to the field of printing technology. The inkjet system based on color detection includes a color acquisition module, a data processing module, a data storage module, a substrate driving module, and an inkjet module. Based on the aforementioned features, an inkjet method is also provided, comprising the following steps: S1 establishing a position model, S2 identifying the background color of the inkjet substrate, S3 identifying dissimilar color areas, S4 repairing dissimilar color areas, and S5 providing feedback on the repair status. This invention identifies the background color and defects of the inkjet substrate through the color acquisition module, and then adjusts the working state of the inkjet module to further cover and hide defects with colorant, thereby optimizing printing effects, improving product quality, reducing defect rates, and reducing material waste.

Description

Technical Field

[0001] This invention relates to the field of printing technology, and more specifically to an inkjet system and method based on color detection. Background Technology

[0002] Printing technology plays a vital role in people's lives and work. It encompasses various methods and processes for transferring images, text, and designs onto paper or other media. It has wide applications in many fields, including publishing, advertising, packaging, and artistic creation. Inkjet technology is a commonly used printing technique that creates images or text by controlling the position and manner of ink jetting onto a medium.

[0003] The substrates for inkjet technology are often made of materials such as paper and plastic film stored in rolls. However, due to improper storage and other reasons, inkjet substrates may develop defects such as water stains, yellowing due to oxidation, etc. If the original preset inkjet program is followed, the defects cannot be dealt with, resulting in poor overall printing effect. In severe cases, the product may have to be discarded. Summary of the Invention

[0004] In order to overcome the problem in the above-mentioned background technology that "traditional inkjet technology cannot handle defects on the substrate, resulting in poor printing effect", the present invention provides a new technical solution that can identify and repair defects on the substrate, optimize printing effect, improve product quality, and reduce defect rate.

[0005] An inkjet system based on color detection includes a color acquisition module, a data processing module, a data storage module, a substrate driving module, and an inkjet module. The data storage module stores preset spraying information. At least three color acquisition modules are provided, including a first color acquisition module for acquiring the base color, a second color acquisition module for acquiring the color of the sprayed area, and a third color acquisition module for providing feedback on the colorant spraying status. The substrate driving module includes an electrically controlled roller-shaped driving assembly. The data storage module is connected to a data export module, allowing operators to retrieve work records from the data storage module and the data processing module, and to trace the working status of these modules.

[0006] It also includes a bonding module connected to the inkjet substrate and the color acquisition module to increase the accuracy of color acquisition; the bonding module includes a first housing and a second housing arranged opposite to each other, both of the first housing and the second housing are cylindrical, the first housing is open on both sides, the first housing is provided with a straight plate-shaped adsorption plate with a porous structure near the opening position of the first housing near the inkjet substrate, and a first light shield is provided at the opening position of the first housing away from the inkjet substrate; the second housing is open on both sides, the second housing is provided with a second light shield at the opening position of the second housing away from the inkjet substrate, and the second light shield is provided with an air inlet; a side roller group composed of side rollers is provided on both sides of the connection position between the first housing and the second housing, and the side rollers are provided with exhaust holes;

[0007] A cylindrical third housing is fixedly connected to the middle of the second light-shielding plate. A support ring is provided at the end of the third housing. A light strip for supplementary lighting is fixedly connected to the support ring. A mounting hole for installing a color acquisition module is provided in the middle of the support ring.

[0008] Inkjet substrates are typically rectangular (or roll-shaped) materials such as paper or plastic film. The central area of ​​the substrate is the spraying area, and the surrounding area is the non-spraying area. The non-spraying area provides a margin for error generated during the operation of the spraying module. Within the spraying area, several sub-spraying areas are set according to the spraying sequence, namely the first sub-spraying area, the second sub-spraying area, the third sub-spraying area, ..., the nth sub-spraying area. The background color acquisition area is located within the non-spraying area, specifically on the short side of the first sub-spraying area and at the material flow front. Operators must ensure that the background color acquisition area is clean and free of defects. If an off-color area is found within the background color acquisition area, the inkjet substrate should be replaced, or the background color acquisition area should be appropriately trimmed, and the spraying area, non-spraying area, and background color acquisition area should be redefined.

[0009] Based on the above system features, the present invention provides an inkjet method that uses a color detection-based inkjet system to jet ink onto an inkjet substrate, comprising the following steps:

[0010] When the S1 substrate driving module drives the inkjet substrate to the positioning station, the data processing module establishes a planar coordinate system with the top corner of the inkjet substrate as the base point; when the driving module drives the inkjet substrate to move inside the inkjet equipment, the data processing module calculates the position data of the sub-spraying area on the inkjet substrate relative to the base point through the driving direction and distance of the driving module.

[0011] The S2 substrate driving module drives the inkjet substrate to move to the background color acquisition station. The first color acquisition module acquires the color information of the background color acquisition area at the front end of the inkjet substrate to generate the first color dataset (for example, the color light signal reflected from the background color acquisition area of ​​the inkjet substrate is digitized using the RGB model, HSV model or HSI model) and transmits it to the data processing module. The data processing module counts the most frequently occurring color and defines it as the temporary standard background color of the inkjet substrate.

[0012] When the S3 substrate driving module drives the sub-spraying area of ​​the inkjet substrate to move to the different color area acquisition station (for example, setting a photoelectric non-contact sensor to detect whether the inkjet substrate has arrived), the second color acquisition module can acquire the color information of the sub-spraying area of ​​the inkjet substrate, generate a second color dataset and transmit it to the data processing module. The data processing module compares the color data in the second color dataset with the temporary standard background color one by one, acquires the different color data, and retrieves the position data of the different color sub-spraying area.

[0013] The S4 data processing module transmits the position data of the dissimilar colorant spraying area to the inkjet module; when the substrate driving module drives the dissimilar colorant spraying area to reach the inkjet station, the inkjet module repairs the dissimilar colorant spraying area until the colorant can cover the dissimilar colorant spraying area; the inkjet module includes a time control submodule, a colorant ratio submodule, and a spraying amount control submodule; the repair method of the inkjet module for the dissimilar colorant spraying area includes adjusting the spraying time, adjusting the colorant ratio, and adjusting the spraying amount.

[0014] The S5 third color acquisition module can instantly acquire the color information of the different color sub-spraying area at the inkjet station, generate a third color dataset, and transmit it back to the data processing module. The data processing module compares the third color dataset with the pre-stored color information of the spraying image. When the third color dataset matches the pre-stored color information of the spraying image, the drive module drives the different color sub-spraying area away from the inkjet station to confirm that the repair of the different color sub-spraying area is completed. Then a new sub-spraying area enters the inkjet station for spraying operation.

[0015] After the last sub-spraying area of ​​S6 is completed, the data processing module resets the base point data, temporary standard base color data, and the location data of the different color sub-spraying area.

[0016] As a further optimization of the present invention, the color acquisition module includes a colorimeter.

[0017] As a further optimization of the present invention, the background color acquisition method at the background color acquisition station is as follows: the first color acquisition module is equipped with at least three parallel color data acquisition points, which are acquired once every 0.1-0.5 seconds, for a total of at least 9 color data points, which are then transmitted to the data processing module.

[0018] In summary, the advantages of this invention are: a color-detection-based inkjet system, comprising a color acquisition module, a data processing module, a data storage module, a substrate driving module, and an inkjet module; the color acquisition module identifies the background color and defects of the inkjet substrate, and then adjusts the working state of the inkjet module to further cover and hide the defects with colorant, thereby optimizing printing effect, improving product quality, reducing defect rate, and reducing material waste. Attached Figure Description

[0019] The present application will be further explained below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram showing the layout of the roller-shaped drive assembly;

[0021] Figure 2 A schematic diagram of the inkjet substrate and the background color acquisition area;

[0022] Figure 3 A schematic diagram of the sprayed area and the non-sprayed area;

[0023] Figure 4 Schematic diagram of the sub-spraying area;

[0024] Figure 5 This is a schematic diagram of the module structure;

[0025] Figure 6 This is a schematic diagram showing the bonding state between the inkjet substrate and the adsorption plate.

[0026] Figure 7 This is a schematic diagram showing the location and structure of the exhaust port.

[0027] Explanation of reference numerals in the attached figures:

[0028] In the diagram, 1. Inkjet substrate; 11. Base color acquisition area; 2. Spraying area; 20. Different color sub-spraying area; 21. First sub-spraying area; 22. Second sub-spraying area; 23. Third sub-spraying area; 2n. Nth sub-spraying area; 3. Non-spraying area; 4. Bonding module; 41. First housing; 411. First arc-shaped part; 42. Second housing; 421. Second arc-shaped part; 43. Side roller; 431. Exhaust hole; 44. First light shield; 45. Second light shield; 451. Air inlet; 46. Adsorption plate; 47. Third housing; 48. LED strip; 49. Support ring; 491. Mounting hole; 5. Roller-shaped drive assembly. Detailed Implementation

[0029] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows:

[0030] An inkjet system based on color detection includes a color acquisition module for acquiring the surface color of an inkjet substrate 1, a data processing module for color information processing, a data storage module connected to the data processing module for data storage, a substrate driving module for driving the movement of the inkjet substrate 1, and an inkjet module for spraying colorant. The data storage module stores preset spraying information (e.g., for the outer surface lines of packaging products), including a preset spraying range, a preset spraying color, and a preset spraying time. At least three color acquisition modules are provided, including a first color acquisition module for acquiring the base color, a second color acquisition module for acquiring the color of the spraying area 2, and a third color acquisition module for providing feedback on the colorant spraying status. The color acquisition modules can be one or more of the following: discrete, external, or embedded. Discrete color acquisition modules include, for example, handheld colorimeters; external color acquisition modules include, for example, colorimeters connected to the inkjet equipment housing via a fixing plate or rod; embedded color acquisition modules include, for example, colorimeters connected to the inner wall of the inkjet equipment via bolts. The colorimeter is an imaging colorimeter. The substrate driving module includes an electrically controlled roller-shaped driving assembly 5, the roller-shaped driving assembly 5 being positioned as follows: Figure 1 As shown; the driving principle is common knowledge in the industry and will not be elaborated further. The data storage module is connected to the data export module. The data export module includes a data cable and / or a wireless signal transmitter, which is used by staff to retrieve the work records of the data storage module and the data processing module, and to trace the working status of the data storage module and the data processing module.

[0031] like Figures 1-4 As shown, the inkjet substrate 1 is generally a rectangular (or roll-shaped) material such as paper or plastic film. The central part of the inkjet substrate 1 is the spraying area 2, and the surrounding part is the non-spraying area 3, which provides a margin for error generated during the operation of the spraying module. Within the spraying area 2, there are several sub-spraying areas arranged according to the spraying sequence, namely the first sub-spraying area 21, the second sub-spraying area 22, the third sub-spraying area 23, ..., the nth sub-spraying area 2n. The background color acquisition area 11 is located within the non-spraying area 3, that is, the background color acquisition area 11 is located along the short side of the first sub-spraying area 21 and is at the material flow front. Workers should ensure that the background color acquisition area 11 is clean and free of defects. If an off-color area (i.e., an area with abnormal color caused by water stains, oxidation, etc.) is found within the background color acquisition area 11, the inkjet substrate 1 should be replaced or the background color acquisition area 11 should be appropriately trimmed, and the spraying area 2, non-spraying area 3, and background color acquisition area 11 should be redefined.

[0032] like Figures 5-7As shown, it also includes a bonding module 4 connected to the inkjet substrate 1 and the color acquisition module to increase the accuracy of color acquisition; the bonding module 4 includes a first housing 41 and a second housing 42 arranged opposite to each other. The first housing 41 and the second housing 42 are both cylindrical. The first housing 41 and the second housing 42 are respectively fixedly connected to the inner wall of the inkjet equipment housing by bolts. The inkjet substrate 1 is disposed between the first housing 41 and the second housing 42. The first housing 41 is open on both sides. The first housing 41 is provided with a straight plate-shaped adsorption plate 46 with a porous structure (for example, fixedly connected by bolts) at the opening position of the first housing 41 near the inkjet substrate. The first housing 41 is provided with a first light shield 44 (for example, fixedly connected by bolts) at the opening position of the first housing 41 away from the inkjet substrate; the second housing 42 is open on both sides. The second housing 42 is provided with a second light shield 45 (for example, fixedly connected by bolts) at the opening position of the second housing 42 away from the inkjet substrate. The second light shield 45 is provided with an air inlet 451; a side roller group composed of side rollers 43 is provided on both sides of the connection position of the first housing 41 and the second housing 42. The side rollers 43 are provided with exhaust holes 431. The first housing 41 includes a first arcuate portion 411 adapted to the side roller 43, and the second housing 42 includes a second arcuate portion 421 adapted to the side roller 43, for ensuring the sealing at the position of the side roller assembly.

[0033] The side roller 43 is connected to the side roller motor, which is bolted to the outer surface of the first housing 41 or the second housing 42. The side roller motor is connected to the power system for power replenishment. The side roller motor drives the side roller 43 to rotate. When there is a speed difference between the two side roller groups, the originally tensioned inkjet substrate 1 can be relaxed, so that the inkjet substrate 1 can adhere to the adsorption plate 46. Afterwards, the two side roller groups return to the state of rotating at the same speed, so that the inkjet substrate 1 can move while maintaining its adherence to the adsorption plate 46.

[0034] like Figures 5-6 As shown, a cylindrical third housing 47 is fixedly connected to the middle of the second light-shielding plate 45. A support ring 49 (e.g., fixedly connected by bolts) is provided at the end of the third housing 47. A light strip 48 for supplemental lighting (e.g., fixedly connected by bolts) is fixedly connected to the support ring 49. The light strip 48 is connected to the power system of the inkjet equipment to supplement power. A mounting hole 491 for installing a color acquisition module is provided in the middle of the support ring 49. The light strip 48 is used to supplement the internal cavity of the second housing 42, enabling the color acquisition module installed in the mounting hole 491 to acquire the color information of the inkjet substrate 1.

[0035] The first housing 41, the second housing 42, the first light shield 44, the second light shield 45, the third housing 47, the support ring 49, and the side roller 43 are all made of opaque materials (such as steel plates) so that the part of the inkjet substrate 1 that is attached to the adsorption plate 46 is not affected by external light when color acquisition, thereby improving the accuracy of color acquisition.

[0036] In conventional technologies, when the inkjet substrate 1 is thin and thus has high light transmittance, gaps on one side of the inkjet substrate 1 can affect the color rendering on the other side, leading to reduced color acquisition accuracy. In this invention, a colorless gas (e.g., carbon dioxide) is injected into the inner cavity of the second housing 42 through an air inlet 451 via an air tube. This creates positive pressure within the second housing 42, pressing the inkjet substrate 1 against the adsorption plate 46. This prevents gaps between the inkjet substrate 1 and the adsorption plate 46, improving the color rendering accuracy of the inkjet substrate 1 within the second housing 42 and thus enhancing color acquisition accuracy. The first housing 41 has a gas balance hole, and the adsorption plate 46 is made of a porous material (e.g., honeycomb board, foam metal board, foam ceramic board, etc.) to expel air between the inkjet substrate 1 and the adsorption plate 46, allowing the inkjet substrate 1 to adhere smoothly to the adsorption plate 46.

[0037] Based on the aforementioned system features, the present invention provides a semi-automatic inkjet operation procedure: the operator uses a handheld colorimeter to collect the color information of the background color collection area 11 at the front end of the inkjet substrate 1, and directly inputs the color information into the inkjet equipment or first inputs it into the processor connected to the inkjet equipment and then indirectly transmits it into the inkjet equipment, and then starts the inkjet equipment to perform a repair spraying operation.

[0038] Based on the aforementioned system features, this invention provides a fully automated online detection inkjet printing process, namely an inkjet printing method, which uses a color detection-based inkjet printing system to print ink onto an inkjet substrate, and the steps are as follows:

[0039] (Preparation: The staff manually or using automated equipment such as a robotic arm places the front end of the inkjet substrate 1 at the feed inlet. The substrate drive module grabs the front end of the inkjet substrate 1 and drags the inkjet substrate 1 into the inkjet equipment.)

[0040] When the S1 substrate driving module drives the inkjet substrate 1 to move to the positioning station (the positioning station is for example, a contact position sensor is set in the positioning groove to detect whether the inkjet substrate 1 has reached the preset position used to define the base point), the data processing module establishes a planar coordinate system with the top corner position of the inkjet substrate 1 as the base point; when the driving module drives the inkjet substrate 1 to move in the inkjet equipment, the data processing module calculates the position data of the sub-spraying area on the inkjet substrate 1 relative to the base point through the driving direction and distance of the driving module (for example, with the short side direction of the inkjet substrate 1 as the Y-axis and the long side as the X-axis, the position of any sub-spraying area on the spraying area 2 relative to the base point can be represented by two-dimensional coordinates, and its horizontal coordinate data is obtained by converting the travel distance of the inkjet substrate 1 relative to the positioning station, and its vertical coordinate data is obtained by measuring the distance sensor when the sub-spraying area passes the base point).

[0041] When the S2 substrate driving module drives the inkjet substrate 1 to move to the background color acquisition station (for example, setting a photoelectric non-contact sensor to detect whether the inkjet substrate 1 has arrived), the first color acquisition module acquires the color information of the background color acquisition area 11 at the front end of the inkjet substrate 1. For example, the first color acquisition module has at least three parallel color data acquisition points, which are acquired once every 0.1-0.5 seconds, and a total of at least 9 color data are acquired and summarized into the first color dataset (for example, the color light signal reflected from the background color acquisition area 11 of the inkjet substrate 1 is digitized using the RGB model, HSV model or HSI model) and transmitted to the data processing module. The data processing module counts the color that appears most often and defines it as the temporary standard background color of the inkjet substrate 1.

[0042] When the S3 substrate driving module drives the sub-spraying area of ​​the inkjet substrate 1 to reach the different color area acquisition station (for example, setting a photoelectric non-contact sensor to detect whether the inkjet substrate 1 has arrived), the second color acquisition module can acquire the color information of the sub-spraying area of ​​the inkjet substrate 1, generate a second color dataset and transmit it to the data processing module. The data processing module compares the color data in the second color dataset one by one with the temporary standard background color, acquires the different color data, and retrieves the position data of the different color sub-spraying area 20.

[0043] The S4 data processing module transmits the position data of the discolorant spraying area 20 to the inkjet module; when the substrate driving module drives the discolorant spraying area 20 to reach the inkjet station, the inkjet module repairs the discolorant spraying area 20 until the colorant can cover the discolorant spraying area 20; the inkjet module includes a time control submodule, a colorant ratio submodule, and a spraying amount control submodule; the inkjet module repairs the discolorant spraying area 20 by adjusting the spraying time, adjusting the colorant ratio, or adjusting the spraying amount. For example, for a discolored area 20 caused by water stains, ① if the preset spraying area 2 can cover the water stain area, extending the spraying time or increasing the spraying amount can completely eliminate the water stain; ② if the preset spraying area 2 cannot cover the water stain area, the water stain area is assigned to a new spraying area 2, and the colorant mixing submodule mixes the colorant to create a temporary standard base color (this color matching principle is common knowledge in the industry and will not be elaborated here), and the inkjet module sprays the new spraying area 2 to match the temporary standard base color; during mass production, pre-mixed colorants, such as whitening agents or fluorescent powders, can be preset in the colorant mixing submodule to save mixing time. Then, the spraying operation is performed according to the preset spraying information.

[0044] The S5 third color acquisition module can instantly acquire the color information of the dissimilar sub-spraying area 20 at the inkjet station, generate a third color dataset, and transmit it back to the data processing module. The data processing module compares the third color dataset with the pre-stored color information of the spraying image. When the third color dataset matches the pre-stored color information of the spraying image, the drive module drives the dissimilar sub-spraying area 20 away from the inkjet station, confirming that the dissimilar sub-spraying area 20 has been repaired. Then, a new sub-spraying area enters the inkjet station for spraying operations.

[0045] After the last sub-spraying area of ​​S6 is completed, the data processing module resets the base point data, temporary standard background color data, and position data of the different color sub-spraying area 20. The reset data is the preset data, for example, the preset base point data is none (blank state), the preset temporary standard background color data is white, and the preset position data of the different color sub-spraying area 20 is none (blank state).

[0046] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In conclusion, for those skilled in the art, any changes, modifications, substitutions, or variations made to this invention based on the guidance of this invention, without departing from the principles and spirit of this invention, still fall within the protection scope of this invention.

Claims

1. An inkjet system based on color detection, characterized in that: The system includes a color acquisition module capable of acquiring the surface color of an inkjet substrate (1), a data processing module for color information processing, a data storage module connected to the data processing module for data storage, a substrate driving module for driving the movement of the inkjet substrate (1), and an inkjet module for spraying colorant. The system comprises at least three color acquisition modules, including a first color acquisition module for acquiring the base color, a second color acquisition module for acquiring the color of the sprayed area (2), and a third color acquisition module for providing feedback on the colorant spraying status. The color acquisition modules include one or more of the following: separate, external, or embedded color acquisition modules. It also includes a bonding module (4) connected to the inkjet substrate (1) and the color acquisition module to increase the accuracy of color acquisition; the bonding module (4) includes a first housing (41) and a second housing (42) arranged opposite to each other. The first housing (41) and the second housing (42) are both cylindrical. The first housing (41) is open on both sides. The first housing (41) is provided with a straight plate-shaped adsorption plate (46) with a porous structure near the opening of the inkjet substrate (1). The first housing (41) is provided with a first light shield (44) away from the opening of the inkjet substrate (1). The second housing (42) is open on both sides. The second housing (42) is provided with a second light shield (45) away from the opening of the inkjet substrate (1). The second light shield (45) is provided with an air inlet (451). The first housing (41) and the second housing (42) are respectively provided with a side roller group composed of side rollers (43) on both sides of the connection position. The side rollers (43) are provided with an exhaust hole (431). The second light shield (45) is fixedly connected to a cylindrical third housing (47) in the middle. The third housing (47) is provided with a support ring (49) at the end. A light strip (48) for supplementary lighting is fixedly connected to the support ring (49). The support ring (49) is provided with a mounting hole (491) for installing a color acquisition module in the middle.

2. The inkjet system based on color detection according to claim 1, characterized in that: The color acquisition module includes a colorimeter.

3. The inkjet system based on color detection according to claim 1, characterized in that: The substrate driving module includes a roller-shaped driving assembly (5).

4. The inkjet system based on color detection according to claim 1, characterized in that: The data storage module is connected to the data export module.

5. An inkjet printing method, characterized in that, The inkjet system based on color detection as described in any one of claims 1-4 is used to perform inkjet printing on an inkjet substrate, and the steps are as follows: When the S1 substrate driving module drives the inkjet substrate (1) to move to the positioning station, the data processing module establishes a planar coordinate system with the top corner of the inkjet substrate (1) as the base point; when the driving module drives the inkjet substrate (1) to move in the inkjet equipment, the data processing module calculates the position data of the sub-spraying area (2) on the inkjet substrate (1) relative to the base point through the driving direction and distance of the driving module. When the S2 substrate driving module drives the inkjet substrate (1) to move to the background color acquisition station, the first color acquisition module acquires the color information of the background color acquisition area (11) at the front end of the inkjet substrate (1), generates the first color dataset and transmits it to the data processing module. The data processing module counts the color that appears most often and defines it as the temporary standard background color of the inkjet substrate (1). When the S3 substrate driving module drives the sub-spraying area (2) of the inkjet substrate (1) to move to the different color area acquisition station, the second color acquisition module can acquire the color information of the sub-spraying area (2) of the inkjet substrate (1), generate the second color dataset and transmit it to the data processing module. The data processing module compares the color data in the second color dataset with the temporary standard background color one by one, identifies the different color data, and retrieves the position data of the different color sub-spraying area (20). The S4 data processing module transmits the position data of the heterochromatic spraying area (20) to the inkjet module; when the substrate driving module drives the heterochromatic spraying area (20) to move to the inkjet station, the inkjet module repairs the heterochromatic spraying area (20) until the colorant can cover the heterochromatic spraying area (20). The S5 third color acquisition module can acquire the color information of the different color sub-spraying area (20) at the inkjet station, generate the third color dataset and transmit it back to the data processing module; the data processing module compares the third color dataset with the pre-stored spraying image color information. When the third color dataset matches the pre-stored spraying image color information, the drive module drives the different color sub-spraying area (20) to leave the inkjet station and a new sub-spraying area (2) enters the inkjet station.

6. The inkjet method according to claim 5, characterized in that: After the last sub-spraying area (2) is sprayed, the data processing module resets the base point data, temporary standard base color data and the position data of the different color sub-spraying area (20).

7. The inkjet method according to claim 5, characterized in that: The background color collection area (11) is located within the non-sprayed area (3).

8. The inkjet method according to claim 7, characterized in that: At the background color acquisition station, the first color acquisition module has at least three parallel color data acquisition points, which are acquired once every 0.1-0.5 seconds, for a total of at least 9 color data and transmitted to the data processing module; the data processing module counts the color that appears most frequently and defines it as the temporary standard background color of the inkjet substrate (1).

9. The inkjet method according to claim 5, characterized in that: The inkjet module includes a time control submodule, a colorant ratio submodule, and a coating amount control submodule.

10. The inkjet method according to claim 9, characterized in that: The method for repairing the heterochromatic sprayed area (20) by the inkjet module includes adjusting the spraying time, adjusting the colorant ratio, and adjusting the spraying amount.

Images