Ink jet printing method for enhancing product surface coating, controller and jet printing equipment

Abstract

The invention discloses an ink jet printing method for enhancing a product surface coating, a controller and jet printing equipment, and the ink jet printing method comprises the steps: grouping a plurality of nozzles in an ink jet printer according to a preset rule to form a plurality of nozzle groups; when a multi-layer jet printing command is received, firstly, one of the plurality of nozzle groups is controlled to jet-print a bottom layer coating liquid for adhering functional ink on the surface of a product; and after jet printing of the bottom layer coating liquid is completed, the other spray head set is controlled to jet-print the first functional ink on the bottom layer coating liquid. Firstly, the bottom layer coating liquid is sprayed and printed on the surface of the product, the adhesive force of the first functional printing ink and the surface of the product is enhanced, meanwhile, the first functional printing ink can also be printing ink with protection performance, and the protection performance of the coating on the surface of the product is enhanced. The bottom coating liquid and the functional ink are added in the jet printing process, so that the adhesive force and the protective performance of the surface coating of the product after jet printing are improved.

Description

Technical Field

[0001] The invention relates to the field of ink jet printing, and in particular to an ink jet printing method, a controller and a jet printing device for enhancing a product surface coating. Background Art

[0002] As an important part of the modern printing field, inkjet printing technology is well-known for its high speed, high resolution and diverse applications. This technology uses tiny nozzles to accurately spray ink onto the printing medium to form text and images.

[0003] In current inkjet printing technology, ink is generally sprayed directly onto the surface of a product. Since there are generally many tiny concave and convex surfaces and uneven surfaces on the surface of a product, there is a problem of insufficient ink adhesion when the ink is sprayed directly onto the surface of the product, which causes the ink to fall off easily. In addition, in existing inkjet printing technology, the protective properties of the product surface coating (such as alcohol resistance, wear resistance, etc.) are generally improved by roughening the surface of the product, or by increasing the dyne value of the surface through plasma treatment or photo-oxidation treatment. That is, in the prior art, the coating on the surface of the product needs to be subjected to secondary processing to improve the protective properties. However, the cost of secondary processing is high and the time is long.

[0004] Therefore, in the prior art, the surface coating of the product after inkjet printing has the problems of insufficient adhesion and poor protective performance. Summary of the invention

[0005] The main purpose of the present invention is to provide an ink jet printing method for enhancing the surface coating of a product, aiming to solve the problem of how to improve the adhesion and protective performance of the surface coating of the product.

[0006] To achieve the above object, the present invention provides an ink jet printing method for enhancing a product surface coating, comprising:

[0007] Grouping multiple nozzles in the inkjet printer according to preset rules to form multiple nozzle groups;

[0008] When receiving a multi-layer printing command, firstly, one of the multiple nozzle groups is controlled to print a bottom coating liquid for adhering functional ink on the surface of the product;

[0009] After the bottom coating liquid is sprayed, another nozzle group is controlled to spray the first functional ink on the bottom coating liquid.

[0010] In some embodiments, grouping a plurality of nozzles in an inkjet printer according to a preset rule to form a plurality of nozzle groups includes:

[0011] Acquiring material information of the product surface and material information of the first functional ink;

[0012] According to the material information of the product surface and the material information of the first functional ink, multiple nozzles in the inkjet printer are grouped to form a first nozzle group for printing the base coating liquid, a second nozzle group for spraying the first functional ink, and a third nozzle group for printing the second functional ink.

[0013] In some embodiments, when receiving the multi-layer printing command, first controlling one of the multiple nozzle groups to print a bottom coating liquid for adhering functional ink on the surface of the product includes:

[0014] Receiving a printing command, parsing the printing command, and obtaining the number of layers to be printed and the area to be printed;

[0015] When the number of printing layers is multiple layers, the material information in the relevant nozzle group is obtained.

[0016] In some embodiments, after the printing of the bottom coating liquid is completed, controlling another nozzle group to print the first functional ink on the bottom coating liquid further includes:

[0017] When the multi-layer printing command includes a multi-layer functional ink printing command, controlling the third nozzle group to print the second functional ink on the first functional ink;

[0018] The base coating liquid, the first functional ink and the second functional ink sprayed onto the surface of the product are cured.

[0019] In some embodiments, when receiving the multi-layer printing command, first controlling one of the multiple nozzle groups to print a bottom coating liquid for adhering functional ink on the surface of the product includes:

[0020] Obtaining coordinate position information of the area to be printed on the surface of the product;

[0021] The bottom coating liquid is spray-printed according to the coordinate position information of the area to be spray-printed on the surface of the product.

[0022] In some embodiments, curing the primer, the first functional ink, and the second functional ink printed on the surface of the product comprises:

[0023] The base coating liquid, the first functional ink and the second functional ink sprayed onto the surface of the product are irradiated by a UV light source.

[0024] In some embodiments, printing the base coating liquid according to the coordinate position information of the preset printing area on the surface of the product includes:

[0025] Acquire surface data information of the surface profile of the printing area;

[0026] Determining a preset distance between the first nozzle group and the surface to be sprayed of the product according to the surface data information of the surface profile;

[0027] Acquire a plurality of surface contour coordinate position information corresponding to the surface contour, each of the contour coordinate position information includes coordinate information corresponding to a different position of the product;

[0028] Based on a preset conversion rule, the plurality of surface contour coordinate position information is converted into corresponding trajectory paths according to the preset distance;

[0029] The first nozzle group is controlled to move at a uniform speed along a preset printing path to print the bottom coating liquid.

[0030] When the preset printing area contains surface data information of the surface contours of straight lines and curves;

[0031] Calculating the distance between the straight line and the first nozzle group and the distance between the curve and the first nozzle group;

[0032] The movement speed of the first nozzle group is determined according to the distance between the straight line and the first nozzle group and the distance between the curve and the first nozzle group, so as to control the first nozzle group to move at a uniform speed along a preset printing path.

[0033] In some embodiments, the present invention further provides a printing device controller, in which a computer program is stored, and when the computer program is executed by the controller, the ink printing method for enhancing the surface coating of a product as described in any one of the above technical solutions is implemented.

[0034] In some embodiments, the present invention further provides a printing device, including a controller, which, when executed, implements the ink printing method for enhancing the surface coating of a product as described in any one of the above technical solutions.

[0035] The beneficial effect of the technical solution of the present invention is that: first, the bottom coating liquid is sprayed on the surface of the product to enhance the adhesion between the first functional ink and the surface of the product, and the first functional ink can also be an ink with protective performance, which enhances the protective performance of the surface coating of the product. By adding the bottom coating liquid and the functional ink during the spray printing process, the adhesion and protective performance of the surface coating of the product after the spray printing are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of steps provided for an embodiment of an ink jet printing method for enhancing a product surface coating according to the present invention;

[0037] Figure 2A detailed schematic diagram of step S2 provided in an embodiment of an ink jet printing method for enhancing a product surface coating of the present invention;

[0038] Figure 3 A detailed schematic diagram of step S3 provided in an embodiment of an ink jet printing method for enhancing a product surface coating of the present invention;

[0039] Figure 4 Step S23 and a schematic diagram of step S23 are provided for an embodiment of an ink jet printing method for enhancing a product surface coating of the present invention.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0044] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] The main purpose of the present invention is to provide an ink jet printing method for enhancing the surface coating of a product, aiming to solve the problem of how to improve the adhesion and protective performance of the surface coating of the product.

[0046] To achieve the above purpose, Figure 1 As shown, the present invention provides an ink jet printing method for enhancing the surface coating of a product, which specifically includes the following steps (S1, S2 and S3):

[0047] Step S1: Grouping multiple nozzles in an inkjet printer according to a preset rule to form multiple nozzle groups. Specifically, the printing device controller groups multiple nozzles in an inkjet printer according to a preset rule to form multiple nozzle groups. In some embodiments, the printing device controller may be selected from:

[0048] First, the programmable logic controller (PLC), which is a computer specially used for industrial automation control, has the characteristics of high reliability, strong anti-interference ability, and flexible programming. It is widely used in automation control in industrial production, including mechanical control, process control, and motion control. It is simple to program, easy to maintain, and highly reliable, and is suitable for a variety of industrial environments.

[0049] Second, industrial PC (IPC), industrial PC has strong computing power and flexible interface configuration, and can handle complex control and data processing tasks. It is suitable for scenarios that require high computing power and complex control logic, such as real-time data acquisition, complex motion control, and advanced human-machine interface (HMI) applications. It has strong computing power and good scalability, and can run complex control algorithms and software.

[0050] As an embodiment, the inkjet printer in the present application is a printer using inkjet printing technology (Ink Jet Printing, IJP). Inkjet printing technology is an advanced printing technology that recreates digital graphics by spraying tiny ink droplets onto the surface of a material. Inkjet printing technology does not require plate making or mold making, nor does it require contact with the material to complete surface coating. The nozzle of an inkjet printer using inkjet printing technology has micron-level nozzle holes, and the nozzle holes of the inkjet printer nozzle are arranged in rows to control the ink spray position and form ink dots.

[0051] As an implementation method, Figure 2 As shown, step S1 specifically includes the following steps (S11 and S12):

[0052] Step S11: Obtaining material information of the product surface and material information of the first functional ink. Specifically, the material information of the product surface and material information of the first functional ink are obtained through the printing device controller. As an implementation, the material information of the product surface and the material information of the first functional ink can be provided by a supplier, or can be obtained through detection by a detection device, and then input into the printing device controller.

[0053] Step S12: Grouping multiple nozzles in the inkjet printer according to the material information of the product surface and the material information of the first functional ink to form a first nozzle group for printing the bottom coating liquid, a second nozzle group for printing the first functional ink, and a third nozzle group for printing the second functional ink. Specifically, the printing device controller groups multiple nozzles in the inkjet printer according to the material information of the product surface and the material information of the first functional ink to form a first nozzle group for printing the bottom coating liquid, a second nozzle group for printing the first functional ink, and a third nozzle group for printing the second functional ink. The material of the bottom coating liquid is selected according to the material information of the product surface and the material information of the first functional ink, so that the bottom coating liquid can enhance the adhesion of the first functional ink to the product surface. As an embodiment, the first functional ink is a color functional ink used to change the color of the product surface. In other embodiments, the first functional ink can be a protective functional ink used to improve the protective performance of the product surface, such as improving the wear resistance, alcohol resistance and insulation performance of the product surface, and different ink materials can be selected according to different needs to improve the protective performance of the product surface. It should be noted that when the number of layers printed on the product surface is three, the multiple nozzles in the inkjet printer are divided into the first nozzle group, the second nozzle group and the third nozzle group; when the number of layers printed on the product surface is two, the multiple nozzles in the inkjet printer are divided into the first nozzle group and the second nozzle group. The multiple nozzles in the inkjet printer can be grouped according to the number of layers to be printed on the product surface. In addition, if the number of layers printed on the product surface is three, when the first functional ink is a color functional ink, the second functional ink is a protective functional ink.

[0054] Step S2: When receiving a multi-layer printing command, first control one of the multiple nozzle groups to print a bottom coating liquid for adhering functional ink on the surface of the product. Specifically, when receiving a multi-layer printing command, the printing device controller first controls one of the multiple nozzle groups to print a bottom coating liquid for adhering functional ink on the surface of the product. The material of the bottom coating liquid is selected according to the material information of the product surface and the material information of the first functional ink, so that the bottom coating liquid can enhance the adhesion of the first functional ink to the surface of the product. Furthermore, when there are tiny concave and convex surfaces on the surface of the product, printing the bottom coating liquid on the surface of the product can fill many tiny concave and convex surfaces on the surface of the product; when there is an uneven surface on the surface of the product, the printed bottom coating liquid can also fill the surface of the product to make it flat.

[0055] Step S3: After the bottom coating liquid is printed, another nozzle group is controlled to print the first functional ink on the bottom coating liquid. Specifically, after the bottom coating liquid is printed, the printing device controller controls another nozzle group to print the first functional ink on the bottom coating liquid. By printing the bottom coating liquid before printing the first functional ink, the first functional ink is printed on the flat bottom coating liquid, thereby avoiding the decrease in adhesion caused by the first functional ink being printed on the tiny concave and convex surface or uneven surface of the product surface, and further increasing the adhesion between the first functional ink and the product surface.

[0056] In some embodiments, Figure 3 As shown, step S2 specifically includes the following steps (S21 and S22):

[0057] Step S21: Receive the printing command, parse the printing command, and obtain the number of layers to be printed and the area to be printed. Specifically, the printing command is received by the printing device controller, and the printing command is parsed to obtain the number of layers to be printed and the area to be printed. The printing command is automatically triggered after the product arrives at the printing station, and the number of layers to be printed in the printing command is the same as the number of layers to be printed on the surface of the product. As an implementation method, the product to be printed is fixed on a preset fixture. After the fixture is moved to the printing station, the position of the fixture and the position of the nozzle are pre-set. After obtaining the position information of the product on the fixture, the position information of the product can be determined, thereby obtaining the position information of the area to be printed on the surface of the product.

[0058] In other embodiments, a visual positioning component is preset in the control of the printing device, and the visual positioning component includes a camera and an image processing unit. The visual positioning component is used to obtain the position information of the preset printing area on the surface of the product. For example, in the product to be printed after laser engraving, such as key cap characters, the controller printer determines the position information of the preset printing area of ​​the product according to the image information of the laser engraving mark fed back by the visual positioning component, and controls the nozzle of the inkjet printer to print the preset printing area according to the position information of the preset printing area.

[0059] Step S22: When the number of printing layers is multiple layers, obtain the material information in the relevant nozzle group. Specifically, when the number of printing layers is multiple layers, the printing device controller obtains the material information in the relevant nozzle group. Exemplarily, when the number of printing layers is three layers, the printing controller obtains the material information in the first nozzle group, the second nozzle group and the third nozzle group respectively, so that the first nozzle group prints the bottom coating liquid in the preset printing area, the second nozzle group prints the first functional ink on the bottom coating liquid, and the third nozzle group prints the second functional ink on the first functional ink.

[0060] In some embodiments, Figure 4 As shown, after the bottom coating liquid is sprayed, another nozzle group is controlled to spray the first functional ink on the bottom coating liquid, and the following steps (S31 and S32) are also included:

[0061] Step S31: When the multi-layer printing command includes a multi-layer functional ink printing command, the third nozzle group is controlled to print the second functional ink on the first functional ink. Specifically, when the multi-layer printing command includes a multi-layer functional ink printing command, the printing device controller controls the third nozzle group to print the second functional ink on the first functional ink. Printing the second functional ink on the first functional ink can change the color of the coating on the surface of the product and enhance the protective performance of the coating on the surface of the product.

[0062] Step S32: Curing the bottom coating liquid, the first functional ink and the second functional ink printed on the surface of the product. As an embodiment, step S32 includes: irradiating the bottom coating liquid, the first functional ink and the second functional ink printed on the surface of the product by a UV light source. Specifically, the UV light source is a UVLED (ultraviolet light emitting diode), which has higher energy efficiency than traditional mercury lamps and consumes less electricity. In addition, the UVLED has a longer life, reducing the frequency of replacing the light source and maintenance costs. At the same time, the UVLED can be started and stopped instantly without preheating time, which helps to improve production efficiency. In addition, the UVLED can provide highly uniform ultraviolet light output, and can accurately control the light intensity and beam shape to adapt to different processing requirements and material properties. Furthermore, the light with a wavelength of 365nm to 395nm belongs to the UV-A band, and the light energy in the wavelength range of 365nm to 395nm is strong enough to effectively excite the polymer ink and enable the polymer ink to quickly start the curing reaction. In other embodiments, the primer, the first functional ink, and the second functional ink printed on the surface of the product are thermally cured by a heat source.

[0063] In some embodiments, step S2 includes the following steps (S23 and S24):

[0064] Step S23: Obtaining coordinate position information of the area to be printed on the surface of the product. Specifically, the printing device controller obtains coordinate position information of the area to be printed on the surface of the product.

[0065] Step S24: Printing the bottom coating liquid according to the coordinate position information of the area to be printed on the product surface. Specifically, the printing device controller controls the first nozzle group to print the bottom coating liquid according to the coordinate position information of the area to be printed on the product surface.

[0066] Further, step S24 includes the following steps: obtaining surface data information of the surface contour of the printing area; determining the preset distance between the first nozzle group and the surface to be sprayed of the product according to the surface data information of the surface contour; obtaining multiple surface contour coordinate position information corresponding to the surface contour, each contour coordinate position information includes coordinate information corresponding to different positions of the product; based on a preset conversion rule, according to a preset distance, converting multiple surface contour coordinate position information into corresponding trajectory paths; controlling the first nozzle group to move at a uniform speed along the preset printing path to print the bottom coating liquid. As an embodiment, when the product is a special-shaped product, the printing device controller obtains the surface data information of the surface contour of the printing area, and controls the first nozzle group to move along the preset printing path according to the surface data information of the surface contour. Specifically, special-shaped products can be those products with irregular shapes and no common standard geometric shapes. These products may have complex and unique shapes, for example, with special curves, asymmetric structures, complex three-dimensional shapes, or are composed of a plurality of different shaped parts. The printing device controller can obtain the surface data information of the surface contour of the printing area through a sensor, a scanner or other measuring equipment. The surface data information of the surface contour may include data such as the height, curvature, and flatness of the printing area to plan a preset printing path. Furthermore, since the surface of the product to be printed is fixed on a preset jig, after the jig is moved to the printing station, the coordinates of the jig can be obtained in advance, and the multiple surface contour coordinates corresponding to the surface contour can be determined by the coordinates of the jig. In other embodiments, after determining the surface to be sprayed of the special-shaped product for scanning, a series of multiple surface contour coordinates can be obtained. After determining the multiple surface contour coordinates, based on the preset conversion rules, the multiple surface contour coordinate points are smoothly connected to form a continuous trajectory path, and then the formed continuous trajectory path is adjusted according to the preset distance.

[0067] As an embodiment, when the surface data information of the surface contour of the preset printing area includes a straight line and a curve, the following steps are included: calculating the distance between the straight line and the first nozzle group and the distance between the curve and the first nozzle group; determining the movement speed of the first nozzle group according to the distance between the straight line and the first nozzle group and the distance between the curve and the first nozzle group, so as to control the first nozzle group to move at a uniform speed according to the preset printing path. Specifically, when the first nozzle group prints the bottom coating liquid on the surface of the product, the nozzle is parallel to the surface of the product, that is, the surface contour of the straight line included in the printing area of ​​the product surface is equal to the distance of the nozzle. However, the surface contour of the curve included in the printing area of ​​the product surface is not equal to the distance of the nozzle. Since the surface contour including the curve is longer than the surface contour including the curve, the nozzle needs to move a longer path when printing the contour of the surface including the curve. Therefore, the nozzle needs to move faster when printing the contour of the surface including the curve to control the nozzle to move at a uniform speed according to the preset printing path.

[0068] In some embodiments, the present invention further provides a printing device controller, in which a computer program is stored, and when the computer program is executed by the controller, the ink printing method for enhancing the surface coating of a product as described in any one of the above technical solutions is implemented.

[0069] In some embodiments, the present invention further provides a printing device, including a controller, which, when executed, implements the ink printing method for enhancing the surface coating of a product as described in any one of the above technical solutions.

[0070] The beneficial effect of the technical solution of the present invention is that: first, the bottom coating liquid is sprayed on the surface of the product to enhance the adhesion between the first functional ink and the surface of the product, and the first functional ink can also be an ink with protective performance, which enhances the protective performance of the surface coating of the product. By adding the bottom coating liquid and the functional ink during the spray printing process, the adhesion and protective performance of the surface coating of the product after the spray printing are improved.

[0071] The above are only partial or preferred embodiments of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. An ink jet printing method for enhancing a product surface coating, characterized in that: include: Grouping multiple nozzles in the inkjet printer according to preset rules to form multiple nozzle groups; When receiving a multi-layer printing command, firstly, one of the multiple nozzle groups is controlled to print a bottom coating liquid for adhering functional ink on the surface of the product; After the bottom coating liquid is sprayed, another nozzle group is controlled to spray the first functional ink on the bottom coating liquid.

2. The ink jet printing method for enhancing the surface coating of a product according to claim 1, characterized in that: The step of grouping a plurality of nozzles in the inkjet printer according to a preset rule to form a plurality of nozzle groups comprises: Acquiring material information of the product surface and material information of the first functional ink; According to the material information of the product surface and the material information of the first functional ink, multiple nozzles in the inkjet printer are grouped to form a first nozzle group for printing the base coating liquid, a second nozzle group for spraying the first functional ink, and a third nozzle group for printing the second functional ink.

3. The ink jet printing method for enhancing the surface coating of a product according to claim 1, characterized in that: When receiving the multi-layer printing command, firstly controlling one of the multiple nozzle groups to print the bottom coating liquid for adhering the functional ink on the surface of the product comprises: Receive the printing command, parse the printing command, and obtain the number of layers to be printed and the area to be printed; When the number of printing layers is multiple layers, the material information in the relevant nozzle group is obtained.

4. The ink jet printing method for enhancing the surface coating of a product according to claim 2, characterized in that: After the printing of the bottom coating liquid is completed, controlling another nozzle group to print the first functional ink on the bottom coating liquid further includes: When the multi-layer printing command includes a multi-layer functional ink printing command, controlling the third nozzle group to print the second functional ink on the first functional ink; The base coating liquid, the first functional ink and the second functional ink sprayed onto the surface of the product are cured.

5. The ink jet printing method for enhancing the surface coating of a product according to claim 4, characterized in that: When receiving the multi-layer printing command, firstly controlling one of the multiple nozzle groups to print the bottom coating liquid for adhering the functional ink on the surface of the product comprises: Obtaining coordinate position information of the area to be printed on the surface of the product; The bottom coating liquid is spray-printed according to the coordinate position information of the area to be spray-printed on the surface of the product.

6. The ink jet printing method for enhancing the surface coating of a product according to claim 4, characterized in that: The step of curing the primer coating liquid, the first functional ink and the second functional ink sprayed onto the surface of the product comprises: The base coating liquid, the first functional ink and the second functional ink sprayed onto the surface of the product are irradiated by a UV light source.

7. The ink jet printing method for enhancing the surface coating of a product according to claim 4, characterized in that: The step of printing the bottom coating liquid according to the coordinate position information of the preset printing area on the surface of the product includes: Acquire surface data information of the surface profile of the printing area; Determining a preset distance between the first nozzle group and the surface to be sprayed of the product according to the surface data information of the surface profile; Acquire a plurality of surface contour coordinate position information corresponding to the surface contour, each of the contour coordinate position information includes coordinate information corresponding to a different position of the product; Based on a preset conversion rule, the plurality of surface contour coordinate position information is converted into corresponding trajectory paths according to the preset distance; The first nozzle group is controlled to move at a uniform speed along a preset printing path to print the bottom coating liquid.

8. The ink jet printing method for enhancing the surface coating of a product according to claim 7, characterized in that: When the preset printing area contains surface data information of the surface contours of straight lines and curves; Calculating the distance between the straight line and the first nozzle group and the distance between the curve and the first nozzle group; The movement speed of the first nozzle group is determined according to the distance between the straight line and the first nozzle group and the distance between the curve and the first nozzle group, so as to control the first nozzle group to move at a uniform speed along a preset printing path.

9. A printing device controller, characterized in that: The controller stores a computer program, and when the computer program is executed by the controller, the ink jet printing method for enhancing the surface coating of a product according to any one of claims 1 to 8 is implemented.

10. A printing device, characterized in that: It comprises a controller, which, when executed, implements the ink jet printing method for enhancing the surface coating of a product as described in any one of claims 1 to 8.

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