Multi-color printing method for single character of high-resolution inkjet printer

Abstract

A method for printing a single character in multiple colors for a high-resolution inkjet printer is completed according to the following steps: 1) improving the number of print heads in the high-resolution inkjet printer; 2) using computer vector design software to design each character; 3) converting the font; 4) cutting each converted character into equal parts one by one to form a plurality of square pixel blocks; then marking a one-to-one corresponding independent code for each pixel block and storing them independently; finally, comparing the pixel blocks marked with the independent code with the ink droplet specifications of the high-resolution inkjet printer used and compressing them in equal proportion to form an installation package; 5) installing the installation package into the controller of the high-resolution inkjet printer through a storage tool, directly calling the characters in the installation package to form the content to be printed, and further calling the independent code of each pixel block in the character while calling the character, and assigning the independent codes of the pixel blocks corresponding to different colors in the character to the corresponding color-coded print heads according to the colors to be printed, and performing printing.

Description

Technical Field

[0001] The invention relates to a printing method, in particular to a multi-color printing method for a single character of a high-resolution inkjet printer. Background Art

[0002] High-resolution inkjet printer printing technology can be divided into piezoelectric and thermal foaming types. The printing resolution of each printing technology exceeds 180DPI (resolution), and the printing width of the nozzle can be between 1mm and 108mm. All are controlled by software to print letters, numbers, Chinese characters, icons and other logos on the surface of the product or the outer packaging in a non-contact manner to improve the efficiency of product identification. In order to enable high-resolution inkjet printers to print various forms of characters to meet the special needs of customers and increase the anti-counterfeiting function of the product, the applicant disclosed an invention patent of "multi-state printing method for high-resolution inkjet printers" in Chinese patent CN 201910331974.0. This method can be used to print a single character in real time, including anti-counterfeiting patterns, grayscale gradients, reverse hollowing, reverse white printing, special identification points and / or 3D effect expressions.

[0003] With the further diversification of customer requirements and the further improvement of anti-counterfeiting requirements, color requirements have been put forward after the character string with anti-counterfeiting patterns, grayscale gradient, reverse hollowing, reverse white printing, special identification points and / or 3D effect expression, that is, how to print a single character in multiple colors, and even include company names, trademarks and many other special requirements in the color character string. The existing high-resolution inkjet printer has only one print head and only a single color ink pipeline. It can only print one color when printing, and cannot realize multi-color printing. If multiple independent print heads are directly used for printing, that is, different colors of ink are printed through each independent print head, but this method can only realize multi-color printing of different characters, and cannot realize multi-color printing of a single character. Summary of the invention

[0004] The object of the present invention is to provide a multi-color printing method for a single character of a high-resolution inkjet printer.

[0005] The single character multi-color printing method for a high-resolution inkjet printer of the present invention is completed by the following steps:

[0006] 1) Improve the print head of the high-resolution inkjet printer used;

[0007] Three or more print heads identical to the original single-row nozzle print head are added inside the high-resolution inkjet printer, each print head is independently connected to an ink cartridge, each ink cartridge contains ink of different colors, all print heads are arranged in parallel and fixed as a whole, the parallel-arranged print heads are synchronously moved and / or fixedly mounted on a conveyor belt or inkjet platform, and sequential coding is performed on all print heads;

[0008] 2) Use computer vector design software to design the font shape of each character;

[0009] A font form incorporating industrial product information is designed for each character. In the process of designing the font form, the design base height of each character is an integer multiple of the number of single-row nozzle holes of the high-resolution inkjet printer print head. Each character with the designed font form is stored in a picture format; each character includes anti-counterfeiting patterns, grayscale gradients, reverse hollowing, reverse white printing, special identification points and / or 3D effects, and each character includes two or more colors;

[0010] 3) Font conversion;

[0011] Importing the characters one by one into a newly created document in the FontLab software to form a storage package containing all the characters, and each character has an independent corresponding character position, the storage package is in a font package format (*.ttf), and each character position has a unique code value;

[0012] 4) Develop software that can open the storage package in step 3), and open the characters in the document one by one according to the unique code value in the storage package, process the opened characters one by one according to the following steps, and then package all the processed characters into an installation package that can be recognized by the high-resolution inkjet printer;

[0013] 4.1) Cutting the opened character into equal square pieces according to the number of single-row nozzle holes of the print head of the high-resolution inkjet printer used, the character is cut into a plurality of square blocks, each of which becomes a pixel block;

[0014] 4.2) A unique independent code is marked for each pixel block, and each pixel block is independently stored together with the unique independent code;

[0015] 4.3) Compare the side length of the pixel block marked with the independent code with the ink droplet specification of the high-resolution inkjet printer used, and proportionally compress each pixel block in both length and width according to the ink droplet specification of the high-resolution inkjet printer, compress each pixel block proportionally to the ink droplet specification size of the high-resolution inkjet printer used, and then store the compressed characters together with the independent code of the pixel block in the document;

[0016] 5) Install the installation package in step 4) into the controller of the high-resolution inkjet printer through a storage tool. The high-resolution inkjet printer directly calls the characters in the installation package according to the required content to form the content to be printed. While calling the characters, it further calls the independent code of each pixel block in the characters, and assigns the independent codes of the pixel blocks corresponding to different colors in the characters to the corresponding color-coded print heads according to the colors to be printed, and performs printing.

[0017] Preferably, in step 1), all the print heads are arranged in parallel and fixed into a whole, and after all the print heads are arranged in sequence, the arrangement direction of the single row of nozzles in the print heads is perpendicular to the moving direction of the print heads in the high-resolution inkjet printer.

[0018] Preferably, the characters designed in step 2) include uppercase and lowercase letters of the 26 English letters, 10 Arabic numerals, commonly used Chinese characters and trademark graphics.

[0019] Preferably, after all the character designs are completed in step 2), the special-shaped characters with color superimposed changes are processed separately, the pictures of the special-shaped characters are disassembled, and each part of the disassembled special-shaped characters is defined as a font library, and the font library is independently stored and packaged and stored in a storage package corresponding to the special-shaped character, and finally all the special-shaped characters are collected and stored as a special-shaped font library.

[0020] Preferably, the independent code of each pixel block in step 4.2) includes a color identification code that can correspond to the print head code.

[0021] Preferably, each pixel block in step 4.2) has a color identification code corresponding to the print head code in addition to having a unique independent code.

[0022] Preferably, in step 5), the independent code of the same pixel block can be simultaneously assigned to two or more print heads, and the same pixel block is repeatedly printed by two or more print heads to achieve superposition of different colors.

[0023] Preferably, in step 4.4), each pixel block is proportionally compressed multiple times using the development software, and each pixel block is finally proportionally compressed into a square block with the same ink droplet size as the high-resolution inkjet printer used.

[0024] Preferably, the decomposition of the special-shaped characters causes the color superimposed change portion to be decomposed into the two font libraries at the same time.

[0025] The printing method of the present invention can solve the problem that the existing high-resolution inkjet printers can only print single characters in a single color and cannot meet the special requirements of customers. The present invention can also arbitrarily retrieve characters during the printing process to randomly form a character string (such as retrieval of different dates according to time changes), support variable code printing, and meet the requirements of enterprises for online instant variable code printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the printing effect of a single character in Chinese Patent No. CN 201910331974.0.

[0027] Figure 2 It is a schematic diagram of the printing effect of a single character using the present invention.

[0028] Figure 3 It is a schematic diagram of the printing effect of multiple characters after printing using the present invention.

[0029] Figure 4 It is another schematic diagram of the printing effect of a single character using the present invention.

[0030] Figure 5a Figure 5b It is a schematic diagram of the special-shaped font library in the second embodiment of the present invention.

[0031] Figure 6 It is a schematic diagram of the printing effect of a single character in the second embodiment of the present invention.

[0032] Figure 7 It is a schematic diagram of the moving direction of the printing nozzle in the present invention. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] The multi-color printing method for a single character of a high-resolution inkjet printer in the present invention is a further innovative design based on the "multi-state printing method for a high-resolution inkjet printer" in Chinese Patent No. CN201910331974.0, which can further realize the multi-color printing of a single character when printing a single character including anti-counterfeiting patterns, grayscale gradient, reverse hollowing, reverse white printing, special identification points and / or 3D effect expression forms, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in Figure 6 , it is even possible to superimpose and print two or more colors. For example, Figure 6 as shown, it can effectively solve the problem that the existing high-resolution inkjet printers cannot meet the special needs of customers due to single color during printing. Figure 2 , Figure 4 The Chinese character "sheng" shown in Figure 4 also contains Figure 1 the anti-counterfeiting patterns, gray scale, reverse hollowing, reverse white contour, special recognition points, and solid printing forms contained in the number "0" shown in Figure 1 . For the sake of emphasizing the color, they are not shown in detail.

[0035] The multi-color printing method in the present invention also supports variable code printing, which can meet the requirements of enterprises for online instant variable code printing, that is, any characters can be retrieved at any time to form a new string, and printing in different forms (colors) can be performed. The specific operation is as follows:

[0036] Example 1

[0037] The multi-color printing method for a single character used in a high-resolution inkjet printer in this example includes the following steps:

[0038] 1. Improve the printing nozzle of the used high-resolution inkjet printer;

[0039] In this example, a thermal bubble high-resolution inkjet printing with 150 single-row straight-through nozzles is selected. Three printing nozzles identical to the original single-row 150-nozzle printing nozzle are added inside the thermal bubble high-resolution inkjet printer. Each printing nozzle is independently connected to an ink cartridge, and one kind of ink among black and RGB three colors is placed in each ink cartridge. The four printing nozzles are arranged in parallel and fixed as a whole, and move synchronously. It is also possible to directly fixedly install the four printing nozzles on the conveyor belt or the inkjet platform.

[0040] Sequential coding is carried out for the printing nozzles corresponding to the four different colors, which are No. 1 head, No. 2 head, No. 3 head, and No. 4 head respectively. Among them: the ink cartridge corresponding to the No. 1 head contains black ink, the ink cartridge corresponding to the No. 2 head contains red ink, the ink cartridge corresponding to the No. 3 head contains yellow ink, and the ink cartridge corresponding to the No. 4 head contains green ink. The single-row 150 nozzles of the four printing nozzles are arranged in parallel and then in sequence, and the arrangement order is the same as the moving direction of the printing nozzle in the high-resolution inkjet printer (the arrangement direction of the nozzles is perpendicular to the moving direction). As Figure 7 shown, in the figure, the No. 1 head and the No. 2 head are shown arranged in parallel and fixed, and the direction indicated by the arrow in the figure is the moving direction of the printing nozzle. Regarding the number of additional printing nozzles, it can be more than three, and inks of more colors can be set according to requirements, with better printing effects.

[0041] 2. Use computer vector design software to design the font forms of each character;

[0042] Design a font form combined with industrial product information for each character. During the process of designing the font form, the design base height of each character is an integer multiple of the number of single-row spray holes in the high-resolution inkjet printer used. Store each character with the designed font form in picture format; each character with the designed font form contains anti-counterfeiting patterns, grayscale gradients, inverse hollowing, reverse white printing, special recognition points, and / or 3D effects, and each character contains two or more colors. Specifically as follows:

[0043] Design each character one by one. During the design process, each character is designed with anti-counterfeiting patterns, grayscale gradients, inverse hollowing, reverse white printing, special recognition points, and / or 3D effect presentation forms according to requirements, and each character is designed with multiple (two or more) different colors. Each character in this step can be the upper and lower cases of the 26 commonly used English letters for printing, a total of 10 Arabic numerals from 0 to 9, commonly used Chinese characters (such as Chinese characters involved in company names, place names, product names, etc.), and trademark graphics, etc.

[0044] Use existing computer vector drawing software. Vector software such as CorelDRAW, PhotoShop, Illustrator, etc. can be used. The present invention preferably uses Illustrator software. Design each character according to customer requirements. Each character contains an anti-counterfeiting effect required by the customer, and each character contains two or more colors. This embodiment takes the Chinese character "生" shown in Figure 2 as an example for detailed description. The Chinese character "生" is printed in four different colors. When using vector drawing software for design, the Chinese character "生" can also be designed in the picture form shown in Figure 4

[0045] ​First, use Adobe Illustrator software to design the Chinese character "sheng". During the design process, incorporate the characteristics of the product and the special requirements of the customer, including anti-counterfeiting patterns, grayscale gradients, inverse hollowing, reverse white inkjet printing, special identification points, and solid inkjet printing effects. And design four different colors according to the anti-counterfeiting effect. During the design process, the basic height of the design of the Chinese character "sheng" should be an integer multiple of the number of single-row spray holes of the high-resolution inkjet printer used. For example, if a piezoelectric high-resolution inkjet printer with 128 straight-row spray holes is used, when designing with computer vector drawing software, the basic height of the Chinese character "sheng" is 128 mm or 128*2 mm, 128*3 mm, etc., which are integer multiples of 128 mm; if a thermal bubble high-resolution inkjet printer with 300 single-row straight-row spray holes is used, the basic height of the designed Chinese character "sheng" is 300 mm, 300*2, 300*3 mm, etc., that is, integer multiples of 300 mm; if a thermal bubble high-resolution inkjet printer with 150 single-row straight-row spray holes is used, the basic height of the designed Chinese character "sheng" is 150 mm, 150*2, 150*3 mm, etc., that is, integer multiples of 150 mm. In this embodiment, a thermal bubble high-resolution inkjet with 150 single-row straight-row spray holes is selected for inkjet printing, and the design height is 150*2 mm.

[0046] Secondly, according to the design scheme of the Chinese character "sheng", design each character one by one. Similar to the Chinese character "sheng", use an integer multiple of the number of single-row spray holes of the high-resolution inkjet printer used as the basic height. And when designing different characters for the same font form, use the same basic height, that is, all characters are based on the same height baseline in the design software coordinate system. After the design is completed, each character is stored in the form of a picture.

[0047] 3. Conversion of the font;

[0048] Import all the designed characters into FontLab software one by one to form a storage package that includes all the designed characters and each character has an independent corresponding character position. This storage package is in the font package format (*.ttf). Specifically:

[0049] Open FontLab software and select New. FontLab software will automatically generate a new document, and each character position in this document has a unique corresponding code value.

[0050] Import the characters designed in step 2 into the FontLab new document one by one, and store them in the corresponding character positions of each character by copying and pasting. That is, copy the Chinese character "sheng" designed in step 2 through the copy function of the vector software, and then enter it into the corresponding character position of the Chinese character "sheng" in the FontLab new document through the paste function of FontLab software. Complete the import of all characters in this way.

[0051] After all characters are imported, each character position has a unique corresponding code value, which can be a code value such as unicode, ANSI, decimal, octal, hexadecimal, etc. In this embodiment, the unicode code value is selected. Then, using the "Generate Font" function built into FontLab software, the document with all characters imported is stored in the font package format (*.ttf) to form an independent storage package containing all good characters.

[0052] The conversion process of this step belongs to mature technology and is easy to convert and implement for those familiar with vector software such as CorelDRAW, PhotoShop, Illustrator, and FontLab software, and can be found in the relevant tutorials of vector software. Therefore, it will not be elaborated in detail here.

[0053] 4. Cut each stored character one by one

[0054] In order to be able to cut the designed characters, a software is developed to open the storage package stored in the font package format in step 3. The computer is used to cut each character, and then the cut characters are packaged into an installation package that can be recognized by a high-resolution inkjet printer. Any one of the characters can be arbitrarily retrieved in the installation package, and the corresponding printing nozzle is assigned according to the unique independent code and / or color recognition code of each pixel block in the character. For the development of the software, on the premise of developing FontLab software, combined with the following description, it can be achieved for software developers.

[0055] Each character is cut according to the following steps:

[0056] 4.1) After using the developed software to open the storage package generated in step 3, according to the code value uniquely corresponding to the character position, that is, obtaining the Chinese character "生" according to the code value of the Chinese character "生", cut the Chinese character "生". Cut the whole Chinese character "生" into 150 equal parts from top to bottom. The number of cut parts is the same as the number of single-row spray holes of the high-resolution inkjet printer used. The height value of each horizontal unit after cutting is 2 mm.

[0057] 4.2) Cut the Chinese character "生" from left to right. The cutting width value is 2 mm, which is the same as the height value of each horizontal unit formed by cutting, so that the unit formed after cutting is a square block. In this step, the square block can be 1 mm, 3 mm, etc., depending on the basic height when designing the font form in the second step and the high-resolution inkjet printer used, and is not limited to 2 mm.

[0058] 4.3) Code each of the multiple square blocks completed in step 4.2) one by one, that is, each square block is a pixel block, and a unique independent code is marked for each pixel block, and each pixel block and its unique independent code are stored independently;

[0059] Specifically, the marking of the independent code can be such that the independent codes of black pixel blocks are set as "1100, 1101, 1102…1200, 1201, 1202…", the independent codes of red pixel blocks are set as "2000, 2001, 2002…2200, 2201, 2202…", the independent codes of yellow pixel blocks are set as "3000, 3001, 3002…3200, 3201, 3202…", and the independent codes of green pixel blocks are set as "4000, 4001, 4002…4200, 4201, 4202…". Each independent code of a pixel block contains a color recognition code (also known as the printing nozzle code), and the first digit can correspond one by one to the printing nozzle code, so that the independent codes of pixel blocks of different colors can be assigned to printing nozzles with different codes according to requirements.

[0060] Of course, the color recognition code can also be set separately and may not be included in the serial number of the independent code, as long as it is convenient to retrieve and configure.

[0061] 4.4) Compare the length and width values of the pixel blocks marked with independent codes with the ink droplet specifications of the high-resolution inkjet printer used, and simultaneously perform equal-proportion compression on each pixel block according to the ink droplet specifications of the high-resolution inkjet printer, compress each pixel block into the ink droplet specification size of the high-resolution inkjet printer used, and then store the compressed characters together with the independent code and color recognition code of the pixel block in the document.

[0062] In this step, the ink droplet specification of the thermal bubble high-resolution inkjet printer with 150 single-row straight nozzles is 0.0846mm * 0.0846mm. Input this ink droplet specification into the developed software, use the developed software to compare the input ink droplet specification with the square blocks cut from the Chinese character "sheng" in step 4, and further use the software to simultaneously and gradually perform equal-proportion reduction on all the square blocks cut from the Chinese character "sheng". First, reduce all the 2mm * 2mm square blocks to 1mm * 1mm, second, reduce them to 0.5mm * 0.5mm square blocks, third, reduce them to 0.25mm * 0.25mm square blocks, fourth, reduce them to 0.125mm * 0.125mm, and finally reduce the square blocks to 0.0846mm * 0.0846mm square blocks, and then store them after the reduction is completed.

[0063] 4.5) Repeat the above steps to open each character in the document one by one according to the unicode code value, and configure each character with cutting, independent code, and color recognition code one by one. Then, perform simultaneous and sequential equal-proportion reduction processing on the cut square blocks, and package the processed document into an installation package recognizable by the inkjet printer. For example: *.lfp and / or *.*. The name and suffix of this installation package can be customized.

[0064] 5. Install the installation package in step 4 into the controller of the high-resolution inkjet printer through a storage tool. When the product passes through the printing nozzle, the high-resolution inkjet printer system directly calls the characters in the installation package according to the required content to form the content to be printed. When calling the characters, further call the independent code and color recognition code of each pixel block in the characters, and assign the independent code and / or color recognition code of the pixel blocks corresponding to different colors in the characters to the printing nozzles with corresponding color codes according to the required printing color to perform printing. For example, assign the pixel blocks starting with the independent code "1" in the Chinese character "生" to nozzle 1, the pixel blocks starting with "2" to nozzle 2, the pixel blocks starting with "3" to nozzle 3, and the pixel blocks starting with "4" to nozzle 4. Let the four printing nozzles perform printing respectively, and the effect shown in Figure 2 or Figure 4 can be achieved. If there are more other colors needed, it can be extended and assigned to other nozzles, such as: nozzle 5, nozzle 6,.... Thus, each character can achieve printing in multiple colors.

[0065] Embodiment 2

[0066] In the above Embodiment 1, the multiple colors within each character are independent, without superposition between adjacent ones and without the effect of color transition. After adding new steps on the basis of Embodiment 1, Embodiment 2 can achieve the effect of color superposition change within each character, as shown in Figure 6 shown.

[0067] This Embodiment 2 still takes the Chinese character "生" as an example for detailed description. On the basis of Embodiment 1, the following steps are added in step 2. Specifically:

[0068] When designing the font form of each character, when the pictures of some characters are as shown in Figure 6 shown, that is, when there is a color superposition change between two colors in the printing effect of the Chinese character "生", disassemble the picture of the Chinese character "生" with color change in the Illustrator software, and call the character with color superposition change a special-shaped character. Specifically, disassemble the picture of the Chinese character "生" with a design height of 150 * 2 mm into Figure 5a , Figure 5bThe two parts shown are defined as font libraries numbered 1# and 2# respectively for each part. After disassembly, they are stored and encapsulated independently. During disassembly, the color overlay change part is disassembled and stored in the 1# and 2# font libraries at the same time. That is, when the 1# and 2# font libraries are combined, the color change parts will be overlaid together. Finally, the entire Chinese character "sheng" is disassembled into two pictures for storage. Of course, when there are multiple color overlay changes in the same character, they are all processed in the above manner, and a character can contain multiple font libraries.

[0069] Then, all special-shaped characters are disassembled one by one and stored to form a special-shaped font library.

[0070] The 1# and 2# font libraries of all special-shaped characters in the special-shaped font library are respectively subjected to steps such as font conversion and cutting processing, and independent codes and color recognition codes are configured for the cut pixel blocks. Finally, the inkjet printing process is executed. In this way, the pixel blocks of the color overlapping part are simultaneously assigned to two printing nozzles. As Figure 7 shown, first, the second nozzle sprays the first color, and then the first nozzle sprays the second color of the overlapping pixel blocks, so that the inkjet printing effect as Figure 6 shown can be formed. While realizing and retaining the color inkjet printing with pixel block segmentation and allocation, it also meets the user's need for color overlay and color-changing inkjet printing.

[0071] In summary, after the high-resolution inkjet printer installs the above installation package, it can call the characters pre-designed in the installation package to form different character strings. Then, according to the independent codes and / or color recognition codes of the pixel blocks in each character, the pixel blocks can be assigned to different printing nozzles, and each character can be inkjet printed with multiple different colors. It can also call characters from the special-shaped font library and repeatedly inkjet print the overlapping parts with nozzles of different color inks, so as to form the effect of color change. It is not necessary to equip each color with a printing nozzle, which can reduce the procurement investment of printing nozzles and reduce the procurement cost and management cost of ink. It maximally supports customers to realize special color (non-standard color) inkjet printing, and at the same time reduces the difficulty of software development and the tediousness of on-site operation by personnel.

Claims

1. A method for printing a single character in multiple colors for a high-resolution inkjet printer is completed by the following steps: 1) Improve the print head of the high-resolution inkjet printer used; Three or more print heads that are the same as the original single-row nozzle print head are added inside the high-resolution inkjet printer, each print head is independently connected to an ink cartridge, each ink cartridge contains ink of different colors, and after all the print heads are arranged in parallel and fixed into a whole, the parallel-arranged print heads are synchronously moved and / or fixedly installed on a conveyor belt or inkjet platform, and sequential coding is performed on all the print heads; 2) Use computer vector design software to design the font shape of each character; A font form incorporating industrial product information is designed for each character. In the process of designing the font form, the design base height of each character is an integer multiple of the number of single-row nozzle holes of the high-resolution inkjet printer print head. Each character with the designed font form is stored in a picture format; each character includes anti-counterfeiting patterns, grayscale gradients, reverse hollowing, reverse white printing, special identification points and / or 3D effects, and each character includes two or more colors; After all characters are designed, the special-shaped characters with color superposition and change are processed separately, the pictures of the special-shaped characters are disassembled, and each part of the disassembled special-shaped characters is defined as a font library, and the font library is independently stored and packaged and stored in a storage package corresponding to the special-shaped characters, and finally all the special-shaped characters are collected and stored into a special-shaped font library; The decomposition of the special-shaped characters, wherein the color superimposed and changed parts are simultaneously decomposed into the two font libraries; 3) Font conversion; Importing the characters one by one into a newly created document in the FontLab software to form a storage package containing all the characters, and each character has an independent corresponding character position, the storage package is in a font package format (*.ttf), and each character position has a unique code value; 4) Develop software that can open the storage package in step 3), and open the characters in the document one by one according to the unique code value in the storage package, process the opened characters one by one according to the following steps, and then package all the processed characters into an installation package that can be recognized by the high-resolution inkjet printer; 4.1) The opened character is cut into equal square pieces according to the number of single-row nozzle holes of the print head of the high-resolution inkjet printer used, and the character is cut into a plurality of square blocks, each of which becomes a pixel block; 4.2) A unique independent code is marked for each pixel block, and each pixel block is stored independently together with the unique independent code; Each pixel block has a color identification code corresponding to the print head code on the basis of having a unique independent code; 4.3) Compare the side length of the pixel block marked with the independent code with the ink droplet specification of the high-resolution inkjet printer used, and compress each pixel block in both length and width in equal proportion according to the ink droplet specification of the high-resolution inkjet printer used, compress each pixel block in equal proportion to the ink droplet specification size of the high-resolution inkjet printer used, and then store the compressed characters together with the independent code of the pixel block in the document; 5) Install the installation package in step 4) into the controller of the high-resolution inkjet printer through a storage tool. The high-resolution inkjet printer directly calls the characters in the installation package according to the required content to form the content to be printed. While calling the characters, it further calls the independent code and color identification code of each pixel block in the characters. The independent codes and color identification codes of the pixel blocks corresponding to different colors in the characters are assigned to the corresponding color-coded print heads according to the colors to be printed, and printing is performed; the independent code of the same pixel block can be assigned to two or more print heads at the same time, and the same pixel block is repeatedly printed by two or more print heads to achieve the superposition of different colors.

2. The single character multi-color printing method for a high-resolution inkjet printer according to claim 1, It is characterized in that In step 1), all the print heads are arranged in parallel and fixed into a whole, and after all the print heads are arranged in sequence, the arrangement direction of the single row of nozzle holes in the print heads is perpendicular to the moving direction of the print heads in the high-resolution inkjet printer.

3. The single character multi-color printing method for a high-resolution inkjet printer according to claim 2, It is characterized in that The characters designed in step 2) include uppercase and lowercase letters of the 26 English letters, 10 Arabic numerals, commonly used Chinese characters and trademark graphics.

4. The single character multi-color printing method for a high-resolution inkjet printer according to claim 1, It is characterized in that In step 4.3), each pixel block is proportionally compressed multiple times using the development software, and each pixel block is finally proportionally compressed into a square block with the same ink droplet size as the high-resolution inkjet printer used.

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