A digital powder jet printing method and a digital powder jet printing machine

Abstract

The present application relates to the technical field of digital powder jet printing, and provides a digital powder jet printing method and a digital powder jet printing machine, which comprise the following steps: S1: providing a conveying channel for conveying a printing substrate; at least one jet printing area, at least one powder jet area and at least one curing area are respectively arranged in the conveying channel in the conveying direction of the conveying channel; S2: providing a jet printing device; when the printing substrate reaches the jet printing area, the jet printing device sprays a jet printing layer on the printing substrate in the jet printing area; S3: providing a powder jet device; the powder jet device comprises a second varnish jet head and a powder jet device; when the printing substrate reaches the powder jet area, the second varnish jet head can spray varnish on the printing substrate in the powder jet area to form a primer layer, and the powder jet device can spray powder on the printing substrate in the powder jet area; S4: providing a curing device.

Description

Technical Field

[0001] This invention belongs to the technical field of digital powder spraying printing equipment, and more specifically, relates to a digital powder spraying printing method and a digital powder spraying printing machine. Background Technology

[0002] In modern digital printing, inkjet printing and powder coating are two common and important methods for creating images and surface effects. Inkjet printing relies on high-precision printheads to precisely spray ink droplets or varnish onto the surface of the substrate, achieving direct imaging of high resolution, multi-color, or functional coatings. Powder coating, on the other hand, involves quantitatively applying powder (such as glitter, metallic powder, matte powder, tactile powder, etc.) onto an ink / varnish layer that is still wet or semi-cured, and obtaining special appearance and tactile effects such as gloss, matte, texture, or three-dimensional particles after curing and powder removal.

[0003] In current industrial production, inkjet printing and powder coating are usually completed independently by different types of equipment: inkjet equipment sprays the pattern or varnish and performs initial curing, while the substrate needs to be transferred to powder coating equipment for powder application, re-curing, and powder removal. Due to the lack of a unified structural platform or synchronous control system, manual handling or secondary positioning is often required between the two processes, which increases the complexity and time cost of the process and is prone to causing registration misalignment, surface contamination, or coating damage during handling. Summary of the Invention

[0004] The purpose of this invention is to provide a digital powder spraying printing method to solve the technical problem in the prior art where the inability to integrate inkjet and powder spraying processes affects processing efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A digital powder spraying printing method is provided, comprising the following steps: S1: providing a conveying channel for conveying a substrate; within the conveying channel, at least one printing area, at least one powder spraying area, and at least one curing area are respectively arranged in the conveying direction of the conveying channel; S2: providing a printing device; the printing device and the printing area correspond one-to-one; the printing device includes at least one of a white ink printhead, a color ink printhead, and a first varnish printhead; when the substrate arrives at the printing area, the printing device sprays the powder onto the substrate within the printing area. S3: Provide a powder spraying device; the powder spraying device and the powder spraying area correspond one-to-one; the powder spraying device includes: a second varnish nozzle and a powder sprayer; when the substrate reaches the powder spraying area, the second varnish nozzle can spray varnish onto the substrate in the powder spraying area to form a varnish underlayer, and the powder sprayer can spray powder onto the varnish underlayer, the varnish underlayer and the powder are mixed to form a powder layer; S4: Provide a curing device; when the substrate reaches the curing area, the curing device cures the printed layer and / or the powder layer; the curing device and the curing area correspond one-to-one.

[0006] The beneficial effects of the digital powder spraying printing method provided by this invention are as follows: Compared with the prior art, the digital powder spraying printing method provided by this invention allows the substrate to be conveyed along a conveying channel; at least one printing area, at least one powder spraying area, and at least one curing area are respectively arranged along the conveying direction of the conveying channel; when the substrate is located in the printing area, the printing device can spray ink or varnish onto the substrate in the printing area to form a printed layer; the printing device includes at least one of a white ink printhead, a color ink printhead, and a first varnish printhead; enabling the printing device to spray white ink, color ink, or varnish to form a printed layer; when the substrate is located in the powder spraying area, the powder spraying device can... The powder coating device applies a powder layer to the substrate within the powder spraying zone. The powder spraying device includes a second varnish nozzle and a powder sprayer. When the substrate is in the powder spraying zone, the second varnish nozzle sprays varnish onto the substrate to form a varnish underlayer, and the powder sprayer sprays powder onto the varnish underlayer. The powder mixes with the varnish underlayer, and the varnish underlayer and powder together form a powder layer. When the substrate is in the curing zone, the curing device cures the printed layer and powder layer on the substrate within the curing zone. After passing through at least one printing zone and at least one powder spraying zone, the substrate reaches the curing zone to cure the printed layer and powder layer, forming a unified whole. In other words, ink spraying, powder coating, and overall curing are achieved as the substrate is sequentially conveyed through the conveyor channel, greatly improving processing efficiency. Attached Figure Description

[0007] Figure 1This is a front view schematic diagram of a digital powder spraying printer provided in an embodiment of the present invention; Figure 2 This is a flowchart illustrating the digital powder spraying printing method provided in an embodiment of the present invention.

[0008] The following are the labeling elements in the figure: 1-Frame; 2-Conveyor belt; 21-Conveying channel; 31-Printing device; 32-Printing area; 41-Curing device; 42-Curing area; 51-Powder spraying device; 52-Powder spraying area; 61-Substrate; 62-Static eliminator; F-Feeding direction. Detailed Implementation

[0009] It should be noted that the specific embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0010] It should be noted that, in the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Here, A and B can be singular or plural, respectively.

[0011] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" or "attached to" another component, it can be directly connected to or indirectly connected to that other component. When a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component.

[0012] It should be noted that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 the present 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 the present invention.

[0013] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0014] It should be noted that the term "multiple" means two or more, unless otherwise explicitly specified.

[0015] Please refer to the following: Figure 1 The digital powder spraying printing method provided by the present invention will now be described. The digital powder spraying printing method includes the following steps: S1: providing a conveying channel 21 for conveying a substrate 61; within the conveying channel 21, at least one printing area 32, at least one powder spraying area 52, and at least one curing area 42 are respectively arranged in the conveying direction of the conveying channel 21; S2: providing a printing device 31; the printing device 31 and the printing area 32 correspond one-to-one; the printing device 31 includes at least one of a white ink printhead, a color ink printhead, and a first varnish printhead; when the substrate 61 arrives at the printing area 32, the printing device 31 sprays the printing image onto the substrate 61 in the printing area 32. S3: Provide a powder spraying device 51; the powder spraying device 51 and the powder spraying area 52 correspond one-to-one; the powder spraying device 51 includes: a second varnish nozzle and a powder sprayer; when the substrate 61 reaches the powder spraying area 52, the second varnish nozzle can spray varnish onto the substrate 61 in the powder spraying area 52 to form a varnish underlayer, and the powder sprayer can spray powder onto the varnish underlayer, the varnish underlayer and the powder mix to form a powder layer; S4: Provide a curing device 41; when the substrate 61 reaches the curing area 42, the curing device 41 cures the printed layer and / or the powder layer; the curing device 41 and the curing area 42 correspond one-to-one.

[0016] Thus, the substrate 61 can be conveyed along the conveying channel 21; at least one printing area 32, at least one powder spraying area 52, and at least one curing area 42 are respectively provided along the conveying direction of the conveying channel 21; when the substrate 61 is located in the printing area 32, the printing device 31 can spray ink or varnish onto the substrate 61 in the printing area 32 to form a printed layer; the printing device 31 includes at least one of a white ink printhead, a color ink printhead, and a first varnish printhead; so that the printing device 31 can spray white ink, color ink, or varnish to form a printed layer; when the substrate 61 is located in the powder spraying area 52, the powder spraying device 51 can coat the substrate 61 in the powder spraying area 52 with a powder layer. The powder spraying device 51 includes a second varnish nozzle and a powder sprayer. When the substrate 61 is located in the powder spraying area 52, the second varnish nozzle sprays varnish onto the substrate 61 in the powder spraying area to form a varnish underlayer. The powder sprayer sprays powder onto the varnish underlayer, and the powder mixes into the varnish underlayer, forming a powder layer together. When the substrate 61 is located in the curing area 42, the curing device 41 cures the printed layer and powder layer on the substrate 61 in the curing area 42. After passing through at least one printing area 32 and at least one powder spraying area 52, the substrate 61 reaches the curing area 42 to cure the printed layer and powder layer on the substrate 61, forming a whole. That is, when the substrate 61 is conveyed sequentially through the conveying channel 21, ink spraying, powder layer coating, and overall curing can be achieved, greatly improving processing efficiency.

[0017] The phrase "area B is downstream of area A" means that, in the conveying direction, the substrate 61 passes through area A and then arrives at area B, or the substrate 61 passes through area A and other areas (such as area C) in sequence before arriving at area B.

[0018] In one embodiment, a printing area 32 is provided downstream of each powder spraying area 52; and a curing area 42 is provided downstream of each printing area 32. Thus, with a printing area 32 provided downstream of each powder spraying area 52, after the powder layer is applied to the substrate 61, an ink underlayer and a protective layer formed by varnish can be formed by the downstream printing device 31.

[0019] In one embodiment, the printing layer includes any one or more of a white ink layer, a colored pattern, and a varnish layer.

[0020] In one embodiment, a curing zone 42 is provided downstream of each powder spraying zone 52.

[0021] In one embodiment, the process of ink or varnish being cured by the curing device 41 after the printing device 31 has printed the ink or varnish can be found in: (Chinese Invention Patent; Publication No.: CN118893906A; Title: A Multifunctional Digital Printing Machine; Publication Date: 2024.11.05), (Chinese Invention Patent; Publication No.: CN118404911A; Title: A Digital Printing Machine Printhead Assembly; Publication Date: 2024.07.30), (Chinese Invention Patent; Publication No.: CN119636274A; Title: A Digital Printing Method; Publication Date: 2024.11.05). (2025.03.18), (Chinese Invention Patent; Publication No.: CN105538938A; Subject: A Digital Inkjet Hot Stamping Process; Publication Date: 2016-05-04), (Chinese Invention Patent; Publication No.: CN104553342A; Subject: Color Three-Dimensional Curved Surface Inkjet Printing Equipment; Publication Date: 2015-04-29), (Chinese Invention Patent; Publication No.: CN103696557A; Subject: A Cement Floor with Spray Painting and a Method for High-Definition Spray Painting Processing on Its Surface; Publication Date: 2014-04-02).

[0022] In one embodiment, the powder coating process of the powder spraying device 51 is as follows: first, a varnish undercoat is sprayed onto the substrate 61, and then powder is sprayed onto the uncured varnish undercoat. Alternatively, the varnish undercoat can be cured further, and finally, excess powder is removed using a suction device. In one embodiment, the above powder coating process can be found in (Chinese Invention Patent; Publication No.: CN118404911A; Subject: A Digital Printing Machine Printhead Assembly; Publication Date: 2024.07.30). In another embodiment, the above powder coating process can be found in (Chinese Invention Patent; Publication No.: CN118893906A; Subject: A Multifunctional Digital Printing Machine; Publication Date: 2024.11.05). In yet another embodiment, the above powder coating process can be found in (Chinese Invention Patent; Publication No.: CN119636274A; Subject: A Digital Printing Method; Publication Date: 2025.03.18).

[0023] In one embodiment, the powder sprayer may refer to the powder spray head in (Chinese Invention Patent; Publication No.: CN118404911A; Subject: A digital printing press printhead assembly; Publication Date: 2024.07.30).

[0024] In one embodiment, the printing device 31 may refer to the printing mechanism in (Chinese Invention Patent; Publication No.: CN118893906A; Subject: A Multifunctional Digital Printing Machine; Publication Date: 2024.11.05).

[0025] In one embodiment, the process of ink or varnish being cured by curing device 41 after inkjet printing device 31 has finished printing can be found in: (Chinese Invention Patent; Publication No.: CN118893906A; Title: A Multifunctional Digital Printing Machine; Publication Date: 2024.11.05), (Chinese Invention Patent; Publication No.: CN118404911A; Title: A Digital Printing Machine Printhead Assembly; Publication Date: 2024.07.30), (Chinese Invention Patent; Publication No.: CN119636274A; Title: A Digital Printing Method; Publication Date: 2025.03.18).

[0026] In one embodiment, the printing substrate 61 can be any one of the following: paper, plastic, metal, glass, ceramic, leather, wood, or textile.

[0027] In one embodiment, the ink is any one of water-based ink, UV ink, and solvent ink.

[0028] In one embodiment, a conveyor belt 2 is provided on the frame 1, and the substrate 61 can be placed on the conveyor belt 2 for conveying. In another embodiment, the space above the conveyor belt 2 for conveying the substrate 61 is a conveying channel 21.

[0029] In one embodiment, the conveying channel 21 is a slot, space, or pipe on the frame 1.

[0030] In one embodiment, the curing device 41 is an ultraviolet curing lamp or a dryer.

[0031] In one embodiment, an electrostatic eliminator 62 is provided upstream of the printing area 32.

[0032] In one embodiment, excess powder can be removed by suction.

[0033] Please see Figure 1As a specific embodiment of the digital powder spraying printing method provided by the present invention, the conveying channel 21 is sequentially provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, a second powder spraying area 52, a second curing area 42, a third printing area 32, and a third curing area 42 along the conveying direction; wherein: A10: In the first printing area 32, the white ink nozzle sprays a white ink layer onto the substrate 61; A11: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer onto the incompletely cured white ink layer; A12: The substrate 61 passes through the first curing area 42... 2. Curing is performed by curing device 41; then excess powder is removed; A13: In the second printing zone 32, the inkjet head prints a colored pattern onto the substrate 61; A14: In the second powder spraying zone 52, the powder spraying device 51 coats the powder layer onto the incompletely cured colored pattern; A15: The substrate 61 is cured by curing device 41 in the second curing zone 42; then excess powder is removed; A16: In the third printing zone 32, the first varnish printhead sprays varnish onto the surface of the substrate 61 to form a protective layer; A17: The substrate 61 is cured by curing device 41 in the third curing zone 42.

[0034] Thus, by setting up the white ink layer, colored pattern, and varnish to form a protective layer in stages, and having the white ink printhead, colored ink printhead, and first varnish printhead complete their respective processing in different printing zones 32, and then cooperating with the corresponding powder spraying zone 52 and curing zone 42, a sequential processing method is formed along the conveying direction. In particular, the white ink layer receives powder coating in the first powder spraying zone 52 before it is fully cured, and after curing in the first curing zone 42, excess powder is removed, allowing the powder layer to act on the white ink layer first; after the colored pattern is formed in the second printing zone 32, it receives powder coating in the second powder spraying zone 52 before it is fully cured, and after curing and removing excess powder in the second curing zone 42, the powder can further act on the colored pattern; finally, the first varnish printhead sprays varnish to form a protective layer, and then cures it in the third curing zone 42, thereby completing the continuous processing of the white ink layer, colored pattern, and varnish to form a protective layer within the same conveying channel 21.

[0035] Please see Figure 1As a specific embodiment of the digital powder printing method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, and a second curing area 42 in sequence along the conveying direction; wherein: A20: In the first printing area 32, the white ink printhead sprays the entire white ink layer onto the substrate 61; A21: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer on the incompletely cured white ink layer; A22: The substrate 61 is cured by the curing device 41 in the first curing area 42; then excess powder is removed; A23: In the second printing area 32, the color ink printhead sprays a color pattern onto the substrate 61; the first varnish printhead sprays varnish on the surface of the color pattern to form a protective layer; A24: The substrate 61 is cured by the curing device 41 in the second curing area 42.

[0036] In this way, the entire white ink layer and its powder coating process are completed using the first printing zone 32, the first powder coating zone 52, and the first curing zone 42, allowing the white ink layer-related processes to be completed in the front end. Then, the color pattern is printed by the color ink printhead in the second printing zone 32, and the first varnish printhead sprays varnish onto the surface of the color pattern to form a protective layer. After that, the entire process enters the second curing zone 42 to complete the curing, thus improving efficiency.

[0037] Please see Figure 1 As a specific embodiment of the digital powder printing method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, and a second curing area 42 in sequence along the conveying direction; wherein: A30: In the first printing area 32, the white ink printhead and the color ink printhead jointly print white and color patterns on the substrate 61; A31: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer on the surface of the incompletely cured white pattern and the incompletely cured color pattern; A32: The substrate 61 is cured by the curing device 41 in the first curing area 42; then the excess powder is removed; A33: In the second printing area 32, the first varnish printhead sprays varnish on the surface of the white pattern and the color pattern to form a protective layer; A34: The substrate 61 is cured by the curing device 41 in the second curing area 42.

[0038] In this way, the work of the white ink printhead and the color ink printhead is further combined into the first printing zone 32, so that the white pattern and the color pattern are completed together in the same printing zone 32. Then, the powder layer is immediately applied to the surface of the incompletely cured white pattern and the incompletely cured color pattern in the first powder spraying zone 52, and the curing and removal of excess powder are completed in the first curing zone 42, thereby making the pattern formation and the powder layer more tightly bonded. By making the white ink printhead and the color ink printhead work together in the first printing zone 32, the substrate 61 can obtain the white pattern and the color pattern simultaneously in the front-end process, and the powder layer coating process is directly implemented in the adjacent first powder spraying zone 52. This can shorten the process distance between the entire pattern formation and the powder spraying, and reduce intermediate segments. After the powder layer coating and the treatment in the first curing zone 42 are completed, the first varnish printhead in the second printing zone 32 sprays varnish on the surface of the white pattern and the color pattern to form a protective layer, and then cures it in the second curing zone 42. This concentrates the formation of the protective layer in the later stage, improving efficiency.

[0039] Please see Figure 1 As a specific embodiment of the digital powder spraying printing method provided by the present invention, the conveying channel 21 is sequentially provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, a second powder spraying area 52, a second curing area 42, a third printing area 32, and a third curing area 42 along the conveying direction; wherein: B10: In the first printing area 32, the first varnish nozzle sprays varnish onto the surface of the transparent substrate 61 to form a varnish layer; B11: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer onto the incompletely cured varnish layer; B12: The substrate 61 passes through... The first curing zone 42 is cured by the curing device 41; then excess powder is removed; B13: In the second printing zone 32, the color ink printhead prints a mirrored color pattern onto the substrate 61; B14: In the second powder spraying zone 52, the powder spraying device 51 coats the powder layer onto the incompletely cured mirrored color pattern; B15: The substrate 61 is cured by the curing device 41 in the second curing zone 42; then excess powder is removed; B16: In the third printing zone 32, the white ink printhead prints a white ink layer onto the substrate 61 as a base coat; B17: The substrate 61 is cured by the curing device 41 in the third curing zone 42.

[0040] Thus, by continuously setting the first printing area 32, the first powder spraying area 52, the first curing area 42, the second printing area 32, the second powder spraying area 52, the second curing area 42, the third printing area 32, and the third curing area 42 within the same conveyor channel 21, the transparent substrate 61 can continuously complete the processing of the varnish layer, the mirrored color pattern, and the white ink layer undercoat along the same conveyor direction, avoiding the process dispersion problem caused by different processes being separated from the same conveyor channel 21. By first printing the varnish layer, applying and curing the powder layer, then printing the mirrored color pattern, applying and curing the powder layer, and finally applying the white ink undercoat, the layers on the transparent substrate 61 can be formed step by step in a clear sequence, and the process connection relationship is clear. The powder coating device 51 applies the powder layer to both the incompletely cured varnish layer and the incompletely cured mirrored colored pattern. The powder coating process is integrated after the corresponding printing process, ensuring that printing and powder coating are no longer separate but rather form a continuous process within the same transport channel 21. The white ink printhead applies a white ink layer as a base coat to the substrate 61 in the third printing zone 32, which is then cured in the third curing zone 42. This allows subsequent base coat processing to continue after the aforementioned layer, ensuring the entire processing can be completed in a continuous transport process and improving efficiency.

[0041] Please see Figure 1 As a specific embodiment of the digital powder printing method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, and a second curing area 42 in sequence along the conveying direction; wherein: B20: In the first printing area 32, the first varnish printhead sprays varnish onto the surface of the transparent substrate 61 to form a varnish layer; B21: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer on the incompletely cured varnish layer; B22: The substrate 61 is cured by the curing device 41 in the first curing area 42; then excess powder is removed; B23: In the second printing area 32, the color ink printhead sprays a mirrored color pattern onto the substrate 61, and the white ink printhead sprays a white ink layer onto the substrate 61 as a base coat; B24: The substrate 61 is cured by the curing device 41 in the second curing area 42.

[0042] Thus, by setting up a first printing zone 32, a first powder spraying zone 52, a first curing zone 42, a second printing zone 32, and a second curing zone 42, the process segments are relatively streamlined. The printing of the varnish layer, powder coating, and curing are completed first in the same conveyor channel 21, and then the mirrored color pattern and white ink undercoating are completed in the subsequent second printing zone 32, making the entire process more compact. The first varnish nozzle first sprays varnish onto the surface of the transparent substrate 61, and the powder spraying device 51 coats the powder layer onto the incompletely cured varnish layer. Then, the curing device 41 cures and removes excess powder, allowing the varnish layer and its corresponding powder spraying treatment to be completed entirely in the preceding process, forming an independent processing stage. In the second printing zone 32, the color ink printhead prints a mirrored color pattern onto the substrate 61, while the white ink printhead prints a white ink layer onto the substrate 61 as a base coat. The formation of the mirrored color pattern and the white ink base coat are integrated into the same section, reducing the number of subsequent process sections and shortening the processing path of the substrate 61 in the transport channel 21. The substrate is then cured by the curing device 41 in the second curing zone 42, ensuring that the content formed in the second printing zone 32 is cured uniformly, further enhancing the continuity of the process.

[0043] Please see Figure 1 As a specific embodiment of the digital powder printing method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, and a second curing area 42 in sequence along the conveying direction; wherein: B30: In the first printing area 32, the color ink printhead sprays a mirrored color pattern onto the transparent substrate 61; B31: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer onto the surface of the incompletely cured mirrored color pattern; B32: The substrate 61 is cured by the curing device 41 in the first curing area 42; then excess powder is removed; B33: In the second printing area 32, the white ink printhead sprays a white ink layer onto the substrate 61 as a base coat; B34: The substrate 61 is cured by the curing device 41 in the second curing area 42.

[0044] Thus, the color ink printhead first forms a mirrored color pattern in the first printing area 32. Then, the powder spraying device 51 coats the surface of the incompletely cured mirrored color pattern with the powder layer. The powder spraying process is directly following the formation of the mirrored color pattern, thereby creating a tight connection between the printing process and the powder spraying process. Afterward, the curing device 41 cures the color pattern in the first curing area 42 and removes excess powder, so that the mirrored color pattern processing is completed in the previous process. Then, the white ink printhead sprays a white ink layer onto the substrate 61 in the second printing area 32 to form a base layer, and completes curing in the second curing area 42. This allows the substrate 61 to continue to complete the subsequent white ink processing in the same conveying channel 21 after completing the mirrored color pattern and its powder spraying treatment.

[0045] Please see Figure 1 As a specific embodiment of the digital powder spraying printing method provided by the present invention, the conveying channel 21 is sequentially provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, a second powder spraying area 52, a second curing area 42, a third printing area 32, a third powder spraying area 52, a third curing area 42, a fourth printing area 32, and a fourth curing area 42 along the conveying direction; wherein: C10: In the first printing area 32, the first varnish printhead sprays varnish onto the surface of the transparent substrate 61 to form a varnish layer; C11: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer onto the incompletely cured varnish layer; C12: The substrate 61 is cured by the curing device 41 in the first curing area 42; then excess powder is removed; C13: In the second printing area 32, the color ink printhead sprays a mirror image onto the substrate 61. C14: In the second powder spraying zone 52, the powder spraying device 51 applies the powder layer to the partially cured mirror-image colored pattern; C15: The substrate 61 is cured by the curing device 41 in the second curing zone 42; then excess powder is removed; C16: In the third printing zone 32, the white ink printhead sprays a white ink layer onto the substrate 61 as a base coat, and the color ink printhead sprays a positive colored pattern onto the substrate 61; C17: In the third powder spraying zone 52, the powder spraying device 51 applies the powder layer to the surface of the partially cured positive colored pattern; C18: The substrate 61 is cured by the curing device 41 in the third curing zone 42; then excess powder is removed; C19: In the fourth printing zone 32, the first varnish printhead sprays varnish onto the surface of the positive colored pattern to form a protective layer; the substrate 61 is cured by the curing device 41 in the fourth curing zone 42.

[0046] Thus, by configuring four printing zones 32, three powder spraying zones 52, and four curing zones 42 on the same conveying channel 21, the transparent substrate 61 can continuously complete multi-stage processing of varnish layer, mirrored color pattern, white ink base coat, forward color pattern, and protective layer along the same conveying direction, thereby orderly integrating multiple printing processes and multiple powder spraying processes into an integrated process. The powder spraying device 51 can act on the substrate 61 at different stages, so that the powder spraying process is embedded into the entire process in layers; in the third printing zone 32, the white ink nozzle sprays a white ink layer onto the substrate to form a base coat, and the color ink nozzle sprays a forward color pattern onto the substrate 61. This section can continue to complete the subsequent content after the aforementioned mirrored color pattern processing; then, in the fourth printing zone 32, the first varnish nozzle sprays varnish onto the surface of the forward color pattern to form a protective layer, and then cures it in the fourth curing zone 42, so that the subsequent protective processing is incorporated into the same continuous process.

[0047] Please see Figure 1 As a specific embodiment of the digital powder spraying printing method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, a second powder spraying area 52, a second curing area 42, a third printing area 32, a third powder spraying area 52, a third curing area 42, a fourth printing area 32, and a fourth curing area 42 in sequence along the conveying direction; wherein: C20: In the first printing area 32, the first varnish nozzle sprays varnish onto the surface of the transparent substrate 61 to form a varnish layer; C21: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer onto the incompletely cured varnish layer; C22: The substrate 61 is cured by the curing device 41 in the first curing area 42; then excess powder is removed; C23: In the second printing area 32, the color ink nozzle sprays ink onto the substrate 61. C24: In the second powder spraying zone 52, the powder spraying device 51 coats the powder layer onto the surface of the incompletely cured mirror-image color pattern; C25: The substrate 61 is cured by the curing device 41 in the second curing zone 42; then excess powder is removed; C26: In the third printing zone 32, the white ink printhead sprays a white ink layer onto the substrate 61 as a base coat; C27: In the third powder spraying zone 52, the powder spraying device 51 coats the powder layer onto the surface of the white ink layer; C28: The substrate 61 is cured by the curing device 41 in the third curing zone 42; then excess powder is removed; C29: In the fourth printing zone 32, the color ink printhead sprays a positive color pattern onto the substrate 61, and the first varnish printhead sprays varnish onto the surface of the positive color pattern to form a protective layer; the substrate 61 is cured by the curing device 41 in the fourth curing zone 42.

[0048] Thus, by arranging four printing zones 32, three powder spraying zones 52, and four curing zones 42 within the same conveyor channel 21, the transparent substrate 61 can continuously complete the layer-by-layer processing of varnish, mirrored color pattern, white ink layer, and forward color pattern and protective layer along the conveying direction. This organizes printing, powder spraying, and curing in a multi-stage, continuous manner within a unified process. The first curing zone 42 cures the varnish and powder layers; the second and third powder spraying zones 52 correspond to the mirrored color pattern and white ink layer, respectively, allowing the powder spraying device 51 to act on different surfaces after different layers are formed, creating a phased and layered processing sequence. Combined with the color ink nozzle forming the forward color pattern and the first varnish nozzle forming the protective layer in the fourth printing zone 32, which is then uniformly cured by the fourth curing zone 42, the subsequent pattern and protective processing can continue to be completed within the same conveyor channel 21 after the aforementioned multiple rounds of printing, powder spraying, and curing.

[0049] Please see Figure 1 As a specific embodiment of the digital powder spraying printing method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, a second powder spraying area 52, a second curing area 42, a third printing area 32, a third powder spraying area 52, a third curing area 42, a fourth printing area 32, and a fourth curing area 42 in sequence along the conveying direction; wherein: C30: In the first printing area 32, the first varnish printhead sprays varnish onto the surface of the transparent substrate 61 to form a varnish layer; C31: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer onto the incompletely cured varnish layer; C32: The substrate 61 is cured by the curing device 41 in the first curing area 42; then excess powder is removed; C33: In the second printing area 32, the color ink printhead sprays a mirrored color pattern onto the substrate 61, and the white ink printhead sprays a mirrored color pattern onto the substrate 61. C34: In the second powder spraying zone 52, the powder spraying device 51 applies the powder layer to the surface of the incompletely cured mirrored color pattern and / or white ink layer; the color pattern and / or white ink layer together form the first layer; C35: The substrate 61 is cured by the curing device 41 in the second curing zone 42; then excess powder is removed; C36: In the third printing zone 32, the color ink printhead sprays a positive color pattern onto the substrate 61; C37: In the third powder spraying zone 52, the powder spraying device 51 applies the powder layer to the surface of the incompletely cured and positive color pattern; C38: The substrate 61 is cured by the curing device 41 in the third curing zone 42; then excess powder is removed; C39: In the fourth printing zone 32, the first varnish printhead sprays varnish onto the surface of the positive color pattern to form a protective layer; the substrate 61 is cured by the curing device 41 in the fourth curing zone 42.

[0050] Thus, the printing of the varnish layer, powder coating, and curing of the transparent substrate 61 are completed through the first printing zone 32, the first powder coating zone 52, and the first curing zone 42, allowing subsequent layer processing to be based on the completed preliminary processing. In the second printing zone 32, the color ink printhead prints a mirrored color pattern onto the substrate 61, and the white ink printhead prints a white ink layer onto the substrate 61 as a base coat, so that the mirrored color pattern and the white ink layer are formed in the same section. In the second powder coating zone 52, the powder coating device 51 coats the surface of the incompletely cured mirrored color pattern and / or white ink layer with the powder layer, thereby forming the first layer together. Then, in the second curing zone 42, the curing device 41 cures the first layer and removes excess powder, so that the mirrored color pattern and white ink layer no longer correspond to separate powder coating zones 52 and curing zones 42, but are integrated into a first layer processing stage, which helps to simplify the connection of intermediate processes. Subsequently, in the third printing zone 32, the third powder spraying zone 52, and the third curing zone 42, the positive color pattern can be independently printed, powder sprayed, and cured, thus forming a separate stage for the positive color pattern related processing; finally, the protective layer is formed and cured through the fourth printing zone 32 and the fourth curing zone 42.

[0051] Please see Figure 1 As a specific embodiment of the digital powder spraying printing method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, a second powder spraying area 52, a second curing area 42, a third printing area 32, and a third curing area 42 in sequence along the conveying direction; wherein: C40: In the first printing area 32, a first varnish nozzle sprays varnish onto the surface of a transparent substrate 61 to form a varnish layer; C41: In the first powder spraying area 52, a powder spraying device 51 coats the powder layer onto the incompletely cured varnish layer; C42: The substrate 61 is cured by the curing device 41 in the first curing area 42; then excess powder is removed; C43: In the second printing zone 32, the color ink printhead prints a mirrored color pattern onto the substrate 61, and the white ink printhead prints a white ink layer onto the substrate 61 as a base coat; C44: In the second powder spraying zone 52, the powder spraying device 51 coats the powder layer onto the surface of the incompletely cured mirrored color pattern and / or white ink layer; C45: The substrate 61 is cured by the curing device 41 in the second curing zone 42; then excess powder is removed; C46: In the third printing zone 32, the color ink printhead prints a forward-facing color pattern onto the substrate 61, and the first varnish printhead sprays varnish onto the surface of the forward-facing color pattern to form a protective layer; C47: The substrate 61 is cured by the curing device 41 in the third curing zone 42.

[0052] Thus, by first setting up a first printing zone 32, a first powder spraying zone 52, and a first curing zone 42 in the same conveying channel 21, the varnish layer on the surface of the transparent substrate 61 can be printed, powdered, and cured first, thereby establishing a pre-processing stage. Subsequently, through the second printing zone 32 and the second powder spraying zone 52, the mirrored color pattern and the white ink layer are formed in the same section, and the powder spraying device 51 directly applies the powder layer to the surface of the incompletely cured mirrored color pattern and / or white ink layer. Then, the second curing zone 42 uniformly cures and removes excess powder. In this way, the mirrored color pattern and the related processing of the white ink layer are integrated into the same processing section, reducing the need for the mirrored color pattern and the white ink layer to form separate independent post-processing stages. In the third printing zone 32, a color pattern is printed onto the substrate 61 by a color ink printhead, and a varnish is printed onto the surface of the color pattern by a first varnish printhead to form a protective layer. Afterward, the substrate 61 is cured by the curing device 41 in the third curing zone 42, thereby further concentrating the formation of the color pattern and the formation of the protective layer in the same section.

[0053] Please see Figure 1 As a specific embodiment of the digital powder spraying printing method provided by the present invention, the conveying channel 21 is sequentially provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, a second powder spraying area 52, a second curing area 42, a third printing area 32, and a third curing area 42 along the conveying direction; wherein: C50: In the first printing area 32, the first varnish nozzle sprays varnish onto the surface of the transparent substrate 61 to form a varnish layer; C51: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer onto the incompletely cured varnish layer; C52: The substrate 61 is cured by the curing device 41 in the first curing area 42; then excess powder is removed; C53: In the second In the printing zone 32, the following processing steps are performed sequentially according to the conveying direction to form the second layer: the color ink printhead prints a mirrored color pattern onto the substrate 61; the white ink printhead prints a white ink layer onto the substrate 61 as a base coat; the color ink printhead prints a forward-facing color pattern onto the substrate 61; C54: In the second powder spraying zone 52, the powder spraying device 51 coats the powder layer onto the surface of the second layer formed by the second printing zone 32; C55: The substrate 61 is cured by the curing device 41 in the second curing zone 42; then excess powder is removed; C56: In the third printing zone 32, the first varnish printhead sprays varnish onto the surface of the second layer to form a protective layer; C57: The substrate 61 is cured by the curing device 41 in the third curing zone 42.

[0054] Thus, the printing, powdering, and curing of the transparent substrate 61 surface varnish layer are completed first through the first printing zone 32, the first powder spraying zone 52, and the first curing zone 42, making the preceding process a clear and independent processing stage. In the second printing zone 32, not only a single content is formed, but three processing steps are executed sequentially according to the conveying direction: the color ink printhead prints a mirrored color pattern, the white ink printhead prints a white ink layer for priming, and the color ink printhead prints a forward-facing color pattern. This directly forms the second layer. The mirrored color pattern, the white ink priming, and the forward-facing color pattern are continuously constructed in the same printing zone 32, further improving the concentration of the second layer formation. Then, the powder spraying device 51 directly coats the powder layer on the surface of the second layer formed by the second printing zone 32 in the second powder spraying zone 52, and the curing device 41 cures the second layer and removes excess powder in the second curing zone 42, so that the overall second layer formed by the second printing zone 32 is treated as a unified object for subsequent processing. In the third printing zone 32, the first varnish nozzle sprays varnish onto the surface of the second layer to form a protective layer, and then cures it in the third curing zone 42, so that the entire second layer can continue to form a protective layer after the powder spraying and curing are completed.

[0055] Please see Figure 1As a specific embodiment of the digital powder spraying printing method provided by the present invention, the conveying channel 21 is sequentially provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, a second powder spraying area 52, a second curing area 42, a third printing area 32, a third powder spraying area 52, a third curing area 42, a fourth printing area 32, and a fourth curing area 42 along the conveying direction; wherein: C60: In the first printing area 32, the inkjet head sprays a mirrored color pattern onto the transparent substrate 61; C61: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer onto the surface of the incompletely cured mirrored color pattern; C62: The substrate 61 is cured by the curing device 41 in the first curing area 42; then excess powder is removed; C63: In the second printing area 32, ... C64: In the second powder spraying zone 52, the powder spraying device 51 coats the surface of the white ink layer with the powder layer; C65: The substrate 61 is cured by the curing device 41 in the second curing zone 42; then excess powder is removed; C66: In the third printing zone 32, the color ink printhead sprays a positive color pattern onto the substrate 61; C67: In the third powder spraying zone 52, the powder spraying device 51 coats the surface of the incompletely cured positive color pattern with the powder layer; C68: The substrate 61 is cured by the curing device 41 in the third curing zone 42; then excess powder is removed; C69: In the fourth printing zone 32, the first varnish printhead sprays varnish onto the surface of the positive color pattern to form a protective layer; the substrate 61 is cured by the curing device 41 in the fourth curing zone 42.

[0056] Thus, by distributing the formation of the mirrored color pattern, the white ink layer, the forward-facing color pattern, and the protective layer to four printing zones 32 according to the conveying direction, and correspondingly setting three powder spraying zones 52 and four curing zones 42, the substrate 61 can continuously complete multiple rounds of printing, powder spraying, and curing within the same conveying channel 21, thereby forming multiple layers and the subsequent protective layer sequentially along the conveying direction. The powder spraying device 51 processes the white ink layer, the mirrored color pattern, and the forward-facing color pattern respectively. The powder spraying process is embedded in stages after the formation of different layers, rather than being separated from the printing process. At the same time, the corresponding curing zones 42 cure the contents formed in the aforementioned stages and remove excess powder, so that the next stage can begin immediately after each stage is completed.

[0057] Please see Figure 1As a specific embodiment of the digital powder spraying printing method provided by the present invention, the conveying channel 21 is sequentially provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, a second powder spraying area 52, a second curing area 42, a third printing area 32, and a third curing area 42 along the conveying direction; wherein: C70: In the first printing area 32, the inkjet head sprays a mirrored color pattern onto the transparent substrate 61; C71: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer onto the surface of the incompletely cured mirrored color pattern; C72: The substrate 61 is cured by the first curing area 42. The device 41 performs curing; then excess powder is removed; C73: In the second printing zone 32, the white ink printhead prints a white ink layer onto the substrate 61 as a base coat; C74: In the second powder spraying zone 52, the powder spraying device 51 coats the powder layer on the surface of the white ink layer; C75: The substrate 61 is cured by the curing device 41 in the second curing zone 42; then excess powder is removed; C76: In the third printing zone 32, the color ink printhead prints a positive color pattern onto the substrate 61, and the first varnish printhead sprays varnish onto the surface of the positive color pattern to form a protective layer; C77: The substrate 61 is cured by the curing device 41 in the third curing zone 42.

[0058] Thus, through the first printing zone 32, the first powder spraying zone 52, and the first curing zone 42, the mirrored color pattern and its corresponding powder spraying and curing processes are completed first, so that the transparent substrate 61 forms the mirrored color pattern content in the front-end process. Through the second printing zone 32, the second powder spraying zone 52, and the second curing zone 42, the white ink layer base coat and its corresponding powder spraying and curing processes are completed, so that the white ink layer can be completed as an independent stage in the same conveying channel 21. In the third printing zone 32, the color ink printhead prints the positive color pattern onto the substrate 61, and the first varnish printhead sprays varnish onto the surface of the color pattern to form a protective layer. Then, the third curing zone 42 performs unified curing. The formation of the positive color pattern and the formation of the protective layer are arranged to be completed in the same back-end processing zone.

[0059] Please see Figure 1As a specific embodiment of the digital powder spraying printing method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 42, a second printing area 32, a second powder spraying area 52, a second curing area 42, a third printing area 32, and a third curing area 42 in sequence along the conveying direction; wherein: C80: In the first printing area 32, the inkjet head sprays a mirrored color pattern onto the transparent substrate 61; C81: In the first powder spraying area 52, the powder spraying device 51 coats the powder layer onto the surface of the incompletely cured mirrored color pattern; C82: The substrate 61 passes through the first curing area 42 and is then fed by the curing device 41. C83: In the second printing zone 32, the white ink printhead prints a white ink layer onto the substrate 61 to form a base layer, and the color ink printhead prints a positive color pattern onto the substrate 61; C84: In the second powder spraying zone 52, the powder spraying device 51 coats the powder layer onto the surface of the incompletely cured positive color pattern; C85: The substrate 61 is cured by the curing device 41 in the second curing zone 42; then excess powder is removed; C86: In the third printing zone 32, the first varnish printhead sprays varnish onto the surface of the positive color pattern to form a protective layer; C87: The substrate 61 is cured by the curing device 41 in the third curing zone 42.

[0060] Thus, in the first printing zone 32, the color ink printhead prints a mirrored color pattern onto the transparent substrate 61. The first powder coating zone 52 and the first curing zone 42 complete the powder layer coating, curing, and removal of excess powder corresponding to the mirrored color pattern, forming a complete front-end stage for the mirrored color pattern process. In the second printing zone 32, the white ink printhead prints a white ink layer onto the substrate 61 as a base coat, while the color ink printhead simultaneously prints a forward-facing color pattern onto the substrate 61. The white ink base coat and the forward-facing color pattern... The color pattern formation is integrated into the same printing area 32. Then, the powder layer is applied to the incompletely cured positive color pattern surface by the second powder spraying area 52, and the positive color pattern is cured and excess powder is removed by the second curing area 42, so that the segment setting of the second stage is more concentrated. Then, the first varnish nozzle in the third printing area 32 sprays varnish on the positive color pattern surface to form a protective layer, and it is cured by the third curing area 42, so that the protective layer treatment constitutes a separate post-stage.

[0061] The present invention also provides a digital powder spraying printing machine comprising: a frame 1, a conveyor belt 2, a drive unit, a printing device 31, a curing device 41, and a powder spraying device 51; the conveyor belt 2 is used to transport a substrate 61; a conveying channel 21 for transporting the substrate 61 is formed above the conveyor belt 2; within the conveying channel 21, at least one printing area 32, at least one powder spraying area 52, and at least one curing area 42 are respectively arranged in the conveying direction of the conveying channel 21; the drive unit is used to drive the conveyor belt 2 to move along the conveying direction; the printing device 31 and the printing area 32 correspond one-to-one; the printing device 31 includes: a white ink printhead, a color ink printhead, and a first varnish printhead. At least one; when the substrate 61 reaches the printing area 32, the printing device 31 sprays a printing layer onto the substrate 61 in the printing area 32; the powder spraying device 51 and the powder spraying area 52 correspond one-to-one; the powder spraying device 51 includes: a second varnish nozzle and a powder sprayer; when the substrate 61 reaches the powder spraying area 52, the second varnish nozzle can spray varnish onto the substrate 61 in the powder spraying area 52 to form a varnish underlayer, and the powder sprayer can spray powder onto the varnish underlayer, the varnish underlayer and the powder mix to form a powder layer; when the substrate 61 reaches the curing area 42, the curing device 41 cures the printing layer and / or the powder layer; the curing device 41 and the curing area 42 correspond one-to-one. Thus, the substrate 61 can be conveyed along the conveying channel 21; at least one printing area 32, at least one powder spraying area 52, and at least one curing area 42 are respectively provided along the conveying direction of the conveying channel 21; when the substrate 61 is located in the printing area 32, the printing device 31 can spray ink or varnish onto the substrate 61 in the printing area 32 to form a printed layer; the printing device 31 includes at least one of a white ink printhead, a color ink printhead, and a first varnish printhead; so that the printing device 31 can spray white ink, color ink, or varnish to form a printed layer; when the substrate 61 is located in the powder spraying area 52, the powder spraying device 51 can coat the substrate 61 in the powder spraying area 52 with a powder layer. The powder spraying device 51 includes a second varnish nozzle and a powder sprayer. When the substrate 61 is located in the powder spraying area 52, the second varnish nozzle sprays varnish onto the substrate 61 in the powder spraying area to form a varnish underlayer. The powder sprayer sprays powder onto the varnish underlayer, and the powder mixes into the varnish underlayer, forming a powder layer together. When the substrate 61 is located in the curing area 42, the curing device 41 cures the printed layer and powder layer on the substrate 61 in the curing area 42. After passing through at least one printing area 32 and at least one powder spraying area 52, the substrate 61 reaches the curing area 42 to cure the printed layer and powder layer on the substrate 61, forming a whole. That is, when the substrate 61 is conveyed sequentially through the conveying channel 21, ink spraying, powder layer coating, and overall curing can be achieved, greatly improving processing efficiency.

[0062] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A digital powder spraying printing method, characterized in that, Includes the following steps: S1: Provides a conveying channel for conveying a substrate; within the conveying channel, at least one printing area, at least one powder spraying area, and at least one curing area are respectively provided in the conveying direction of the conveying channel; S2: Provides printing equipment; The printing device and the printing area correspond one-to-one; the printing device includes at least one of white ink printhead, color ink printhead and first varnish printhead; when the substrate reaches the printing area, the printing device sprays the printing layer onto the substrate in the printing area. S3: Provide a powder spraying device; the powder spraying device and the powder spraying area correspond one-to-one; the powder spraying device includes: a second varnish nozzle and a powder sprayer; when the substrate reaches the powder spraying area, the second varnish nozzle can spray varnish onto the substrate in the powder spraying area to form a varnish underlayer, and the powder sprayer can spray powder onto the varnish underlayer, and the varnish underlayer and the powder are mixed to form a powder layer; S4: Provide a curing device; when the substrate reaches the curing area, the curing device cures the inkjet layer and / or the powder layer; the curing device and the curing area correspond one-to-one.

2. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, a second powder spraying area, a second curing area, a third printing area, and a third curing area along the conveying direction; wherein: A10: In the first printing area, the white ink printhead prints a white ink layer onto the substrate; A11: In the first powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured white ink layer; A12: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; A13: In the second printing area, the color ink printhead prints a color pattern onto the substrate; A14: In the second powder spraying area, the powder spraying device applies the powder layer to the incompletely cured colored pattern; A15: The substrate is cured by the curing device in the second curing zone; then excess powder is removed; A16: In the third printing area, the first varnish nozzle sprays varnish onto the surface of the substrate to form a protective layer. A17: The substrate is cured by the curing device in the third curing zone.

3. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, and a second curing area sequentially along the conveying direction; wherein: A20: In the first printing area, the white ink printhead prints the entire white ink layer onto the substrate; A21: In the first powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured white ink layer; A22: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; A23: In the second printing area, the color ink printhead prints a color pattern onto the substrate; the first varnish printhead prints varnish onto the surface of the color pattern to form a protective layer. A24: The substrate is cured by the curing device in the second curing zone.

4. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, and a second curing area sequentially along the conveying direction; wherein: A30: In the first printing area, the white ink printhead and the color ink printhead jointly print white and color patterns onto the substrate. A31: In the first powder spraying area, the powder spraying device applies the powder layer to the surfaces of the incompletely cured white pattern and the incompletely cured colored pattern; A32: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; A33: In the second printing area, the first varnish nozzle sprays varnish onto the surfaces of the white pattern and the colored pattern to form a protective layer; A34: The substrate is cured by the curing device in the second curing zone.

5. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, a second powder spraying area, a second curing area, a third printing area, and a third curing area along the conveying direction; wherein: B10: In the first printing area, the first varnish nozzle sprays varnish onto the transparent surface of the substrate to form a varnish layer. B11: In the first powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured varnish layer; B12: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; B13: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate; B14: In the second powder spraying zone, the powder spraying device applies the powder layer to the incompletely cured mirrored colored pattern; B15: The substrate is cured by the curing device in the second curing zone; then excess powder is removed; B16: In the third printing area, the white ink printhead prints a white ink layer onto the substrate as a base coat. B17: The substrate is cured by the curing device in the third curing zone.

6. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, and a second curing area sequentially along the conveying direction; wherein: B20: In the first printing area, the first varnish nozzle sprays varnish onto the transparent substrate surface to form a varnish layer; B21: In the first powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured varnish layer; B22: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; B23: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate, and the white ink printhead prints a white ink layer onto the substrate as a base coat. B24: The substrate is cured by the curing device in the second curing zone.

7. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, and a second curing area sequentially along the conveying direction; wherein: B30: In the first printing area, the inkjet head prints a mirrored color pattern onto the transparent substrate; B31: In the first powder spraying zone, the powder spraying device applies the powder layer to the uncured surface of the mirrored colored pattern; B32: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; B33: In the second printing area, the white ink printhead prints a white ink layer onto the substrate as a base coat; B34: The substrate is cured by the curing device in the second curing zone.

8. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, a second powder spraying area, a second curing area, a third printing area, a third powder spraying area, a third curing area, a fourth printing area, and a fourth curing area along the conveying direction; wherein: C10: In the first printing area, the first varnish nozzle sprays varnish onto the transparent surface of the substrate to form a varnish layer. C11: In the first powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured varnish layer; C12: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; C13: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate; C14: In the second powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured mirrored colored pattern; C15: The substrate is cured by the curing device in the second curing zone; then excess powder is removed; C16: In the third printing area, the white ink printhead prints a white ink layer onto the substrate to form a base, and the color ink printhead prints a positive color pattern onto the substrate. C17: In the third powder spraying zone, the powder spraying device applies the powder layer to the incompletely cured surface of the positive colored pattern. C18: The substrate is cured by the curing device in the third curing zone; then excess powder is removed; C19: In the fourth printing area, the first varnish nozzle prints varnish onto the forward-facing colored pattern surface to form a protective layer. The substrate is cured by the curing device in the fourth curing zone.

9. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, a second powder spraying area, a second curing area, a third printing area, a third powder spraying area, a third curing area, a fourth printing area, and a fourth curing area along the conveying direction; wherein: C20: In the first printing area, the first varnish nozzle sprays varnish onto the transparent surface of the substrate to form a varnish layer; C21: In the first powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured varnish layer; C22: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; C23: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate; C24: In the second powder spraying zone, the powder spraying device applies the powder layer to the uncured surface of the mirrored colored pattern; C25: The substrate is cured by the curing device in the second curing zone; then excess powder is removed; C26: In the third printing area, the white ink printhead prints a white ink layer onto the substrate as a base coat; C27: In the third powder spraying zone, the powder spraying device coats the powder layer onto the surface of the white ink layer; C28: The substrate is cured by the curing device in the third curing zone; then excess powder is removed; C29: In the fourth printing area, the inkjet head prints a forward-facing color pattern onto the substrate, and the first varnish print head prints varnish onto the surface of the forward-facing color pattern to form a protective layer. The substrate is cured by the curing device in the fourth curing zone.

10. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, a second powder spraying area, a second curing area, a third printing area, a third powder spraying area, a third curing area, a fourth printing area, and a fourth curing area along the conveying direction; wherein: C30: In the first printing area, the first varnish nozzle sprays varnish onto the transparent surface of the substrate to form a varnish layer; C31: In the first powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured varnish layer; C32: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; C33: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate, and the white ink printhead prints a white ink layer onto the substrate as a base coat. C34: In the second powder spraying area, the powder spraying device applies the powder layer to the surface of the incompletely cured mirrored colored pattern and / or the white ink layer; the mirrored colored pattern and / or the white ink layer together form the first layer; C35: The substrate is cured by the curing device in the second curing zone; then excess powder is removed; C36: In the third printing area, the inkjet head prints a forward-facing color pattern onto the substrate; C37: In the third powder spraying zone, the powder spraying device applies the powder layer to the uncured and forward-facing surface of the colored pattern; C38: The substrate is cured by the curing device in the third curing zone; then excess powder is removed; C39: In the fourth printing area, the first varnish nozzle prints varnish onto the forward-facing colored pattern surface to form a protective layer. The substrate is cured by the curing device in the fourth curing zone.

11. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, a second powder spraying area, a second curing area, a third printing area, and a third curing area along the conveying direction; wherein: C40: In the first printing area, the first varnish nozzle sprays varnish onto the transparent surface of the substrate to form a varnish layer; C41: In the first powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured varnish layer; C42: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; C43: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate, and the white ink printhead prints a white ink layer onto the substrate as a base coat. C44: In the second powder spraying zone, the powder spraying device applies the powder layer to the surface of the incompletely cured mirrored colored pattern and / or the white ink layer; C45: The substrate is cured by the curing device in the second curing zone; then excess powder is removed; C46: In the third printing area, the inkjet printhead prints a forward-facing color pattern onto the substrate, and the first varnish printhead prints varnish onto the surface of the forward-facing color pattern to form a protective layer. C47: The substrate is cured by the curing device in the third curing zone.

12. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, a second powder spraying area, a second curing area, a third printing area, and a third curing area along the conveying direction; wherein: C50: In the first printing area, the first varnish nozzle sprays varnish onto the transparent substrate surface to form a varnish layer; C51: In the first powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured varnish layer; C52: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; C53: In the second printing area, the following processing steps are performed sequentially according to the transport direction to form a second layer: The inkjet prints a mirrored color pattern onto the substrate; The white ink printhead prints a white ink layer onto the substrate as a base coat. The inkjet head prints a forward-facing colored pattern onto the substrate; C54: In the second powder spraying area, the powder spraying device applies the powder layer to the surface of the second layer formed by the second printing area; C55: The substrate is cured by the curing device in the second curing zone; then excess powder is removed; C56: In the third printing area, the first varnish nozzle prints varnish onto the surface of the second layer to form a protective layer; C57: The substrate is cured by the curing device in the third curing zone.

13. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, a second powder spraying area, a second curing area, a third printing area, a third powder spraying area, a third curing area, a fourth printing area, and a fourth curing area along the conveying direction; wherein: C60: In the first printing area, the inkjet head prints a mirrored color pattern onto the transparent substrate; C61: In the first powder spraying zone, the powder spraying device applies the powder layer to the uncured surface of the mirrored colored pattern; C62: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; C63: In the second printing area, the white ink printhead prints a white ink layer onto the substrate as a base coat; C64: In the second powder spraying zone, the powder spraying device coats the powder layer onto the surface of the white ink layer; C65: The substrate is cured by the curing device in the second curing zone; then excess powder is removed; C66: In the third printing area, the inkjet head prints a forward-facing color pattern onto the substrate; C67: In the third powder spraying zone, the powder spraying device applies the powder layer to the incompletely cured positive colored pattern surface; C68: The substrate is cured by the curing device in the third curing zone; then excess powder is removed; C69: In the fourth printing area, the first varnish nozzle prints varnish onto the forward-facing colored pattern surface to form a protective layer. The substrate is cured by the curing device in the fourth curing zone.

14. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, a second powder spraying area, a second curing area, a third printing area, and a third curing area along the conveying direction; wherein: C70: In the first printing area, the inkjet head prints a mirrored color pattern onto the transparent substrate; C71: In the first powder spraying zone, the powder spraying device applies the powder layer to the uncured surface of the mirrored colored pattern; C72: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; C73: In the second printing area, the white ink printhead prints a white ink layer onto the substrate to form a base layer; C74: In the second powder spraying zone, the powder spraying device coats the powder layer onto the surface of the white ink layer; C75: The substrate is cured by the curing device in the second curing zone; then excess powder is removed; C76: In the third printing area, the inkjet printhead prints a forward-facing color pattern onto the substrate, and the first varnish printhead prints varnish onto the surface of the forward-facing color pattern to form a protective layer. C77: The substrate is cured by the curing device in the third curing zone.

15. The digital powder spraying printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a second printing area, a second powder spraying area, a second curing area, a third printing area, and a third curing area along the conveying direction; wherein: C80: In the first printing area, the inkjet head prints a mirrored color pattern onto the transparent substrate; C81: In the first powder spraying zone, the powder spraying device applies the powder layer to the uncured surface of the mirrored colored pattern; C82: The substrate is cured by the curing device in the first curing zone; then excess powder is removed; C83: In the second printing area, the white ink printhead prints a white ink layer onto the substrate to form a base, and the color ink printhead prints a positive color pattern onto the substrate. C84: In the second powder spraying zone, the powder spraying device applies the powder layer to the surface of the positive colored pattern that is not fully cured; C85: The substrate is cured by the curing device in the second curing zone; then excess powder is removed; C86: In the third printing area, the first varnish nozzle prints varnish onto the forward-facing colored pattern surface to form a protective layer. C87: The substrate is cured by the curing device in the third curing zone.

16. A digital powder spraying printing machine, characterized in that, include: frame; conveyor; The conveyor belt is used to transport the substrate; a transport channel for transporting the substrate is formed above the conveyor belt; within the transport channel, at least one printing area, at least one powder spraying area, and at least one curing area are respectively arranged in the transport direction of the transport channel. Drive unit; The driving device is used to drive the conveyor belt to move along the conveying direction; Printing equipment; The printing device and the printing area correspond one-to-one; the printing device includes at least one of white ink printhead, color ink printhead and first varnish printhead; when the substrate reaches the printing area, the printing device sprays the printing layer onto the substrate in the printing area. A powder spraying device; the powder spraying device and the powder spraying area correspond one-to-one; the powder spraying device includes: a second varnish nozzle and a powder sprayer; when the substrate reaches the powder spraying area, the second varnish nozzle can spray varnish onto the substrate in the powder spraying area to form a varnish underlayer, and the powder sprayer can spray powder onto the varnish underlayer, and the varnish underlayer and the powder mix to form a powder layer. A curing device; when the substrate reaches the curing area, the curing device cures the inkjet layer and / or the powder layer; the curing device and the curing area correspond one-to-one.

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