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

Abstract

The present application relates to the technical field of powder spraying transfer equipment, and provides a digital powder spraying transfer method and a digital powder spraying transfer printing machine, which comprise the following steps: step S1: at least one spraying area, at least one transfer area, at least one powder spraying area and at least one curing area are respectively arranged in the conveying direction of the conveying channel; step S2: the spraying device sprays the printing material to form a spraying layer on the printing material in the spraying area; step S3: the transfer device transfers the transfer film to the surface of the printing material; step S4: the second varnish spraying head can spray varnish on the printing material in the powder spraying area to form a varnish primer layer, the powder sprayer can spray powder on the varnish primer layer, and the varnish primer layer and the powder are mixed to form a powder layer; and step S5: the curing device cures the spraying layer and / or the powder layer.

Description

Technical Field

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

[0002] In modern digital printing, powder spraying and transfer printing are two common and important methods for creating surface effects and functional layers. Powder spraying typically involves quantitatively applying powder (such as glitter, metallic powder, matte powder, tactile powder, etc.) to a wet or semi-cured ink / varnish layer, followed by heating, UV light, or hot air curing, and removal of any unadhered powder to achieve glossy, matte, textured, or three-dimensional particle effects. Transfer printing (hot stamping), on the other hand, is a technique that uses heat to transfer metal foil onto a material surface. It utilizes high temperature and pressure to precisely adhere gold, silver, or other colored foils to the substrate, creating a glossy effect. In current industrial production, powder spraying and transfer printing are usually performed independently by different equipment: powder spraying equipment is responsible for powder application, curing, and powder removal, while transfer printing equipment is responsible for film application, heating and pressurization, and peeling. Due to the lack of a unified structural platform and synchronous control, the substrate and medium need to be repeatedly moved or repositioned between the two types of equipment. This not only increases the process and cycle time, but also easily introduces problems such as powder scattering causing pollution, alignment errors causing rough or misaligned pattern edges, and powder falling off or poor transfer adhesion due to mismatched curing degrees. Summary of the Invention

[0003] The purpose of this invention is to provide a digital powder spraying and transfer printing method to solve the technical problem in the prior art where the powder spraying and transfer printing processes cannot be integrated, thus affecting processing efficiency.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a digital powder transfer printing method, comprising the following steps: Step S1: Provide a conveyor channel for conveying the substrate; within the conveyor channel, at least one printing area, at least one transfer area, at least one powder spraying area and at least one curing area are respectively provided in the conveying direction of the conveyor channel; Step S2: Provide 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 reaches the printing area, the printing device prints onto the substrate in the printing area to form a printing layer. Step S3: Provide a transfer device; the transfer device and the transfer area correspond one-to-one; when the substrate arrives at the transfer area, the transfer device transfers the transfer film onto the surface of the substrate; Step S4: 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; Step S5: 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.

[0005] The beneficial effects of the digital powder transfer printing method provided by this invention are as follows: Compared with the prior art, the digital powder transfer printing method provided by this invention allows the substrate to be conveyed along a conveying channel; at least one printing area, at least one transfer 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 print a printing layer onto the substrate within the printing area; when the substrate is located in the transfer area, the transfer device can transfer the transfer film onto the surface of the substrate; when the substrate is located in the powder spraying area, the powder spraying device can form a powder layer on the surface of the substrate; when the substrate is located in the curing area, the curing device can cure the printing layer and / or powder layer on the substrate. Thus, the substrate can sequentially complete the printing, transfer, powder spraying, and curing processes within the same conveying channel, thereby organically combining multiple processing methods into a single continuous processing flow. Attached Figure Description

[0006] Figure 1 This is a front view schematic diagram of a digital powder transfer printing machine provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the digital powder transfer printing method provided in an embodiment of the present invention.

[0007] The following are the labeling elements in the figure: 1-Frame; 2-Conveyor belt; 21-Conveying channel; 31-Printing device; 32-Printing area; 41-Transfer device; 42-Transfer area; 51-Powder spraying device; 52-Powder spraying area; 61-Curing device; 62-Curing area; 71-Substrate; 72-Static eliminator; F-Feeding direction. Detailed Implementation

[0008] 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.

[0009] It should be noted that, in the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, step A / step B can mean step A or step 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, step A and / or step B can represent: step A existing alone, step A and step B existing simultaneously, and step B existing alone. Here, step A and step B can be singular or plural, respectively.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] It should be noted that the term "multiple" means two or more, unless otherwise explicitly specified.

[0014] Please refer to the following: Figure 1 and Figure 2The digital powder transfer printing method provided by the present invention will now be described. The digital powder transfer printing method includes the following steps: Step S1: providing a conveying channel 21 for conveying the substrate 71; within the conveying channel 21, at least one printing area 32, at least one transfer area 42, at least one powder spraying area 52, and at least one curing area 62 are respectively arranged in the conveying direction of the conveying channel 21; Step 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 71 arrives at the printing area 32, the printing device 31 sprays ink onto the substrate 71 in the printing area 32 to form a printed layer; Step S3: providing a transfer device 41; the transfer device 41 and the transfer area 42 correspond one-to-one. One-to-one correspondence; when the substrate 71 reaches the transfer area 42, the transfer device 41 transfers the transfer film onto the surface of the substrate 71; step S4: providing 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 71 reaches the powder spraying area 52, the second varnish nozzle can spray varnish onto the substrate 71 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; step S5: providing a curing device 61; when the substrate 71 reaches the curing area 62, the curing device 61 cures the printed layer and / or the powder layer; the curing device 61 and the curing area 62 correspond one-to-one.

[0015] Thus, the substrate 71 can be conveyed along the conveying channel 21; at least one printing area 32, at least one transfer area 42, at least one powder spraying area 52, and at least one curing area 62 are respectively arranged along the conveying direction of the conveying channel 21; when the substrate 71 is located in the printing area 32, the printing device 31 can print on the substrate 71 in the printing area 32 to form a printing layer; when the substrate 71 is located in the transfer area 42, the transfer device 41 can transfer the transfer film to the surface of the substrate 71; when the substrate 71 is located in the powder spraying area 52, the powder spraying device 51 can form a powder layer on the surface of the substrate 71; when the substrate 71 is located in the curing area 62, the curing device 61 can cure the printing layer and / or powder layer on the substrate 71. Therefore, the substrate 71 can sequentially complete the printing, transfer, powder spraying, and curing processes within the same conveying channel 21, thereby organically combining multiple processing methods into the same continuous processing flow. The inkjet printing device 31 and the inkjet printing area 32 correspond one-to-one. The inkjet printing device 31 includes at least one of a white ink printhead, a color ink printhead, and a first varnish printhead, enabling the inkjet printing device 31 to spray white ink, color ink, or varnish according to processing needs, and form an inkjet printing layer on the surface of the substrate 71, thereby providing a basic graphic layer or functional layer for pattern formation, subsequent transfer printing, or powder spraying. The transfer printing device 41 and the transfer printing area 42 correspond one-to-one. When the substrate 71 reaches the transfer printing area 42, the transfer printing device 41 can transfer the transfer film onto the surface of the substrate 71, so that the transfer film and the inkjet printing layer on the surface of the substrate 71 cooperate, thereby enhancing the pattern layering and decorative effect on the surface of the substrate 71. 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 71 is located in the powder spraying area 52, the second varnish nozzle first sprays varnish onto the substrate 71 to form a varnish underlayer. The powder sprayer then sprays powder onto the varnish underlayer, allowing the powder to mix into the varnish underlayer and jointly form a powder layer. This allows the powder to adhere better to the surface of the substrate 71 or related layers, which is beneficial to improving the adhesion stability of the powder layer and the overall molding effect, and can further enhance the three-dimensionality, texture, and surface decoration effect of the finished product. The curing device 61 and the curing area 62 correspond one-to-one. When the substrate 71 reaches the curing area 62, the curing device 61 can cure the printed layer and / or the powder layer, thereby making the printed layer, powder layer, and related surface structures more stable, improving the bonding strength between layers and the overall firmness, and also saving steps.

[0016] The printing device 31 includes at least one of a white ink printhead, a color ink printhead, and a first varnish printhead. Each printing device 31 may have multiple white ink printheads, multiple color ink printheads, and multiple first varnish printheads. In one embodiment, different first varnish printheads may spray transfer varnish or barrier varnish respectively.

[0017] In one embodiment, after the substrate 71 passes through the transfer area 42 and the transfer film is transferred onto the substrate 71, it can be protected by ink or varnish sprayed by the printing device 31 through the downstream printing area 32, thus ensuring the firmness of the transfer effect.

[0018] In one embodiment, the transfer film is transferred onto the inkjet printing layer.

[0019] In one embodiment, a printing area 32 is provided downstream of each transfer area 42.

[0020] In one embodiment, the printing substrate 71 can be any one of the following: paper, plastic, metal, glass, ceramic, leather, wood, or textile.

[0021] In one embodiment, the ink is any one of water-based ink, UV ink, and solvent ink.

[0022] In one embodiment, the printing layer is one or more layers of colored ink, white ink, or varnish layer.

[0023] In one embodiment, the transfer film may be any one of the following: heat transfer hot stamping paper, electroplated aluminum hot stamping film, fabric hot stamping paper, or transfer film made of materials such as PE, PET, PVC, and PP.

[0024] In one embodiment, regarding barrier varnish: it is sprayed onto areas where transfer is not required, forming a low-adhesion or release interface. It is also used as a release layer to prevent accidental adhesion when some underlying inks are inherently viscous.

[0025] In one embodiment, the barrier varnish can be found in (Chinese Invention Patent; Publication No.: CN105860823A; Title: A High-Barrier UV-Curable Varnish and Its Preparation Method; Publication Date: 2016.08.17).

[0026] In one embodiment, a conveyor belt 2 is provided on the frame 1, and the substrate 71 can be placed on the conveyor belt 2 for conveying. In another embodiment, the space above the conveyor belt 2 for conveying the substrate 71 is a conveying channel 21.

[0027] In one embodiment, the conveying channel 21 is a slot, space, or pipe on the frame 1.

[0028] In one embodiment, the curing device 61 is an ultraviolet curing lamp or a dryer.

[0029] In one embodiment, an electrostatic eliminator 72 is provided upstream of the printing area 32.

[0030] The phrase "area B is downstream of area A" means that, in the conveying direction, the substrate 71 passes through area A and then arrives at area B, or the substrate 71 passes through area A and other areas (such as area C) in sequence before arriving at area B.

[0031] In one embodiment, regarding the transfer process: In the transfer zone 42, the unwinding device releases the transfer film; the tensioning device applies constant tension to the transfer film and performs lateral tensioning, cooperating with the transfer auxiliary roller to flatten it and guide it above the substrate 71. The lifting mechanism drives the heatable and / or pressurized transfer roller to press down, forming a pressure line (line pressure) with the substrate 71, causing the transfer film to selectively peel off from the base film and adhere to the surface of the substrate 71 in the area coated with transfer varnish at a preset temperature, pressure, and linear speed. After the roller is lifted, the transfer film separates from the substrate 71, and the untransferred portion is recovered by the winding device. Optionally, when multiple transfer mechanisms are provided, the substrate 71 can sequentially complete the superposition transfer of different transfer materials in subsequent transfer zones 42; if necessary, the substrate 71 can continue to be printed with colored ink and / or protective varnish in subsequent printhead areas and then cured with ultraviolet light.

[0032] In one embodiment, the transfer varnish and transfer process can be found in (Chinese Invention Patent; Publication No.: CN118418600A; Subject: A Digital Printing Method; Publication Date: 2024.08.02).

[0033] In one embodiment, the transfer varnish and transfer film can be found in (Chinese Invention Patent; Publication No.: CN111391531A; Subject: A method for preparing a digital inkjet printing water transfer film, the water transfer film and the water transfer method; Publication Date: 2020.07.10).

[0034] In one embodiment, the transfer process can be found in (Chinese Invention Patent; Publication No.: CN118386664A; Subject: A digital printing press transfer component; Publication Date: 2024-07-26).

[0035] In one embodiment, the transfer process can be found in (Chinese Utility Model Patent; Publication No.: CN221067457U; Subject: A heat transfer film printing device; Publication Date: 2024-06-04).

[0036] 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).

[0037] In one embodiment, the process of the inkjet printing device 31 printing ink or varnish and then curing it by the curing device 61 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).

[0038] In one embodiment, a printing area 32 is provided downstream of each powder spraying area 52; and a curing area 62 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 71, an ink underlayer and a protective layer formed by varnish can be formed by the downstream printing device 31.

[0039] In one embodiment, a curing zone 62 is provided downstream of each powder spraying zone 52.

[0040] In one embodiment, the process of ink or varnish being cured by the curing device 61 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: 2024.07.30). (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).

[0041] 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 71, and then powder (or 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).

[0042] 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).

[0043] 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).

[0044] In one embodiment, the process of ink or varnish being cured by curing device 61 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).

[0045] In one embodiment, the curing device 61 is an ultraviolet curing lamp or a dryer.

[0046] In one embodiment, excess powder can be removed by suction.

[0047] In one embodiment, in this application, whenever a powder layer is applied to a transfer varnish layer before transfer, the powder layer is only applied to a localized area of ​​the transfer varnish layer. In another embodiment, in this application, whenever a powder layer is applied to a transfer varnish layer before transfer, the powder layer may also penetrate into the transfer varnish layer.

[0048] In one embodiment, in this application, a transfer varnish is sprayed onto the area to be transferred before each transfer process.

[0049] Please see Figure 1 As a specific embodiment of the digital powder transfer 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 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a second transfer area 42, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71. In the first printing area 32, the white ink printhead sprays a white ink layer onto the substrate 71, and the first varnish printhead sprays a transfer varnish layer in the area of ​​the white ink layer that needs to be transferred for the first time, and the first varnish printhead sprays a barrier varnish layer in the area that does not need to be transferred for the first time. When the white ink is a non-viscous ink, the barrier varnish layer may not be sprayed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed, so that the surface of the substrate 71 forms a basic structure suitable for subsequent powder spraying and transfer processing. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured white ink layer and / or transfer varnish layer to ensure the powder layer aligns with the previously formed white ink layer and / or transfer varnish layer. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed to stabilize the aforementioned layer structure. In the first transfer zone 42, the transfer device 41 transfers a first transfer film onto the substrate 71, forming the first transfer film beneath the subsequently printed color pattern, thus providing a lower layer transfer effect for the subsequent color pattern. In the second printing zone 32, the inkjet printhead prints a color pattern onto the substrate 71, and the first varnish printhead prints a first protective varnish layer onto the color pattern. In the second powder spraying zone 52, the powder spraying device 51 applies a powder layer to the color pattern and / or the first protective varnish layer. The substrate 71 is cured by the curing device 61 in the second curing zone 62, and then excess powder is removed, allowing the colored pattern and / or the first protective varnish layer to form a stable bond with the powder layer. In the second transfer zone 42, the transfer device 41 transfers a second transfer film onto the substrate 71 again, thereby further enhancing the layering effect and surface texture of the pattern. In the third printing zone 32, the first varnish nozzle sprays a second protective varnish layer onto the surface of the substrate 71; the substrate 71 is then cured by the curing device 61 in the third curing zone 62, thus completing the overall surface treatment.

[0050] Please see Figure 1 As a specific embodiment of the digital powder transfer 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 62, a first transfer area 42, a second printing area 32, a second curing area 62, a second transfer area 42, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71. In the first printing area 32, the white ink printhead sprays a white ink layer onto the substrate 71, and the first varnish printhead sprays a first transfer varnish layer onto the area of ​​the white ink layer that needs to be transferred for the first time, and the first varnish printhead sprays a barrier varnish layer onto the area that does not need to be transferred for the first time. When the white ink is a non-viscous ink, the barrier varnish layer may not be sprayed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed, thereby forming a base area for subsequent powder spraying and transfer in the first stage. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured white ink layer and / or the first transfer varnish layer, allowing the powder spraying process to directly follow the first printing process. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, thereby stabilizing the previously formed structure. In the first transfer zone 42, the transfer device 41 transfers the first transfer film onto the substrate 71. In the second printing zone 32, the color ink printhead prints a color pattern onto the substrate 71, and the first varnish printhead prints a second transfer varnish layer onto the color pattern. The substrate 71 is cured by the curing device 61 in the second curing zone 62, thereby stabilizing the structure formed in the second stage of printing. In the second transfer zone 42, the transfer device 41 transfers the second transfer film onto the substrate 71, thus applying the second transfer film to the area containing the color pattern formed in the second stage. In the third printing zone 32, the first varnish printhead prints a protective varnish layer onto the surface of the substrate 71. The substrate 71 is then cured by the curing device 61 in the third curing zone 62, completing the overall process.

[0051] Please see Figure 1As a specific embodiment of the digital powder transfer 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 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71. In the first printing area 32, the white ink printhead sprays a white ink layer onto the substrate 71, and the first varnish printhead sprays a transfer varnish layer in the area of ​​the white ink layer that needs to be transferred for the first time, and the first varnish printhead sprays a barrier varnish layer in the area that does not need to be transferred for the first time. When the white ink is a non-viscous ink, the barrier varnish layer may not be sprayed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed, so that the substrate 71 first forms a base layer structure suitable for subsequent powder spraying and transfer printing. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured white ink layer and / or transfer varnish layer, allowing the powder spraying process to continue the layer structure formed by the aforementioned printing. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed. In the first transfer zone 42, the transfer device 41 transfers a transfer film onto the substrate 71, stabilizing the structure formed by the first stage of printing, powder spraying, and transfer. In the second printing zone 32, the color ink printhead prints a color pattern onto the substrate 71, and the first varnish printhead prints a first protective varnish layer onto the color pattern. In the second powder spraying zone 52, the powder spraying device 51 applies a powder layer to the color pattern and / or the first protective varnish layer. The substrate 71 is cured by the curing device 61 in the second curing zone 62, and then excess powder is removed, thereby stabilizing the relevant layer structure formed around the color pattern in the second stage. In the third printing zone 32, the first varnish nozzle prints a second protective varnish layer on the surface of the substrate 71; the substrate 71 is then cured by the curing device 61 in the third curing zone 62, thus completing the overall processing flow.

[0052] Please see Figure 1 As a specific embodiment of the digital powder transfer method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first powder printing area 52, a first curing area 62, a first transfer area 42, a second printing area 32 and a second curing area 62 in sequence along the flow direction of the substrate 71. In the first printing zone 32, a white ink printhead prints a white ink layer onto the substrate 71. A first varnish printhead prints a transfer varnish layer onto the areas of the white ink layer that require the first transfer, and a barrier varnish layer onto the areas that do not require the first transfer. When the white ink is a non-viscous ink, the barrier varnish layer may not be printed. The white ink printhead and the first varnish printhead can be overlaid multiple times, thus forming a base layer structure on the substrate 71 for receiving powder spraying and transfer before entering subsequent processes. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured white ink layer and / or transfer varnish layer, allowing the powder to bond with the aforementioned white ink layer and / or transfer varnish layer. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, thereby stabilizing the relevant layer structures formed in the first printing zone 32 and the first powder spraying zone 52. In the first transfer zone 42, the transfer device 41 transfers the transfer film onto the substrate 71, incorporating the transfer process into the continuous processing flow. In the second printing zone 32, the inkjet printhead prints a colored pattern onto the substrate 71, and the first varnish printhead prints a protective varnish layer onto the colored pattern, forming the colored pattern and its protective layer on the surface of the substrate 71. The substrate 71 is then cured by the curing device 61 in the second curing zone 62, thus completing the stabilization process of the subsequently formed colored pattern and protective varnish layer.

[0053] Please see Figure 1As a specific embodiment of the digital powder transfer printing method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first curing area 62, a first transfer area 42, a second printing area 32, a first powder spraying area 52, a second curing area 62, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71. In the first printing area 32, the white ink printhead sprays a white ink layer onto the substrate 71, and the first varnish printhead sprays a transfer varnish layer onto the area of ​​the white ink layer that needs to be transferred for the first time, and the first varnish printhead sprays a barrier varnish layer onto the area that does not need to be transferred for the first time. When the white ink is a non-viscous ink, the barrier varnish layer may not be sprayed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed, so as to first form a white ink layer and a layer structure related to subsequent transfer on the surface of the substrate 71. The substrate 71 is cured by the curing device 61 in the first curing zone 62, stabilizing the structure formed by the aforementioned white ink layer, transfer varnish layer, and barrier varnish layer. In the first transfer zone 42, the transfer device 41 transfers the transfer film onto the substrate 71, so that the transfer film forms on the surface of the substrate 71 before the colored pattern, thereby providing a lower layer transfer effect for the subsequently formed colored pattern. In the second printing zone 32, the inkjet nozzle prints the colored pattern onto the substrate 71, forming the colored pattern on the transfer film. The first varnish nozzle prints the first protective varnish layer on the colored pattern, thereby clarifying the positional relationship between the colored pattern and the transfer film, and forming the first protective varnish layer on the surface of the colored pattern. In the first powder spraying zone 52, the powder spraying device 51 coats a powder layer onto the colored pattern and / or the first protective varnish layer, so that the powder spraying process acts on the colored pattern and / or the first protective varnish layer to form a powder decorative effect on the colored pattern and / or the first protective varnish layer. The substrate 71 is cured by the curing device 61 in the second curing zone 62, and then excess powder is removed to stabilize the structure of the colored pattern, the first protective varnish layer, and the powder layer formed in the second stage, and to improve the layering and surface texture of the pattern. In the third printing zone 32, the first varnish nozzle prints the second protective varnish layer on the surface of the substrate 71; the substrate 71 is then cured by the curing device 61 in the third curing zone 62, thus completing the overall processing flow.

[0054] Please see Figure 1As a specific embodiment of the digital powder transfer printing method provided by the present invention, the conveying channel 21 is provided with a first printing area 32, a first curing area 62, a first transfer area 42, a second printing area 32, a second curing area 62, a first powder spraying area 52, a third curing area 62, a second transfer area 42, a third printing area 32, and a fourth curing area 62 in sequence along the flow direction of the substrate 71. In the first printing area 32, the white ink printhead sprays a white ink layer onto the substrate 71, and the first varnish printhead sprays a transfer varnish layer onto the area of ​​the white ink layer that needs to be transferred for the first time, and the first varnish printhead sprays a barrier varnish layer onto the area that does not need to be transferred for the first time. When the white ink is a non-viscous ink, the barrier varnish layer may not be sprayed. The white ink printhead and the first varnish printhead may be superimposed and printed multiple times as needed, so that the substrate 71 first forms a base layer structure for subsequent transfer. The substrate 71 is cured by the curing device 61 in the first curing zone 62, thereby stabilizing the related layer structure formed by the aforementioned inkjet printing. In the first transfer zone 42, the transfer device 41 transfers a first transfer film onto the substrate 71, thereby setting the first transfer film on the substrate 71. In the second inkjet zone 32, a color ink printhead prints a color pattern onto the first transfer film, and a first varnish printhead prints a first protective varnish layer onto the color pattern, thereby forming the color pattern on the first transfer film and forming a first protective varnish layer on the surface of the color pattern. The substrate 71 is cured by the curing device 61 in the second curing zone 62, thereby stabilizing the related layer structure formed around the color pattern. In the first powder spraying zone 52, the powder spraying device 51 coats a powder layer onto the color pattern and / or the first protective varnish layer. The substrate 71 is cured by the curing device 61 in the third curing zone 62, and then excess powder is removed. In the second transfer zone 42, the transfer device 41 transfers the second transfer film onto the substrate 71. In the third printing zone 32, the first varnish nozzle sprays a second protective varnish layer onto the surface of the second transfer film. The substrate 71 is then cured by the curing device 61 in the fourth curing zone 62, thus completing the overall processing procedure.

[0055] Please see Figure 1As a specific embodiment of the digital powder transfer 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 62, a second printing area 32, a second powder spraying area 52, a second curing area 62, a first transfer area 42, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71. In the first printing area 32, the white ink printhead sprays a white ink layer onto the substrate 71, and the first varnish printhead sprays a transfer varnish layer in the area of ​​the white ink layer that needs to be transferred for the first time, and the first varnish printhead sprays a barrier varnish layer in the area that does not need to be transferred for the first time. When the white ink is a non-viscous ink, the barrier varnish layer may not be sprayed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed, so that the substrate 71 first forms a base layer structure for subsequent processing. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured white ink layer and / or transfer varnish layer, allowing the powder spraying process to directly act on the aforementioned base layer structure. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, stabilizing the relevant layer structure formed in the first stage. In the second printing zone 32, the color ink printhead prints a color pattern onto the substrate 71, and the first varnish printhead prints a first protective varnish layer onto the color pattern. In the second powder spraying zone 52, the powder spraying device 51 applies a powder layer to the color pattern and / or the first protective varnish layer, thereby forming a corresponding powder layer structure around the color pattern in the second stage. The substrate 71 is cured by the curing device 61 in the second curing zone 62, and then excess powder is removed, stabilizing the aforementioned relevant layer structure formed around the color pattern. In the first transfer zone 42, the transfer device 41 transfers a transfer film onto the substrate 71. In the third printing zone 32, the first varnish nozzle prints a second protective varnish layer on the surface of the substrate 71; the substrate 71 is then cured by the curing device 61 in the third curing zone 62, thus completing the overall processing flow.

[0056] Please see Figure 1As a specific embodiment of the digital powder transfer 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 62, a second printing area 32, a second curing area 62, a first transfer area 42, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71. In the first printing area 32, the white ink printhead sprays a white ink layer onto the substrate 71, and the first varnish printhead sprays a first transfer varnish layer onto the area of ​​the white ink layer that needs to be transferred for the first time, and the first varnish printhead sprays a barrier varnish layer onto the area that does not need to be transferred for the first time. When the white ink is a non-viscous ink, the barrier varnish layer may not be sprayed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed, thereby forming a basic layer structure on the substrate 71 that can be used for subsequent powder spraying, curing, and transfer printing processes. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured white ink layer and / or the first transfer varnish layer and / or the barrier varnish layer, clearly defining the powder spraying target as at least one of the white ink layer, the first transfer varnish layer, and / or the barrier varnish layer. This allows the powder spraying process to directly connect with the aforementioned printing process and enables the powder layer to cooperate with the corresponding incompletely cured layer structure. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, stabilizing the related structures of the white ink layer, the first transfer varnish layer, the barrier varnish layer, and the powder layer formed in the first printing zone 32 and the first powder spraying zone 52. In the second printing zone 32, the color ink printhead prints a color pattern onto the substrate 71, and the first varnish printhead prints a second transfer varnish layer onto the color pattern, thereby forming the color pattern and second transfer varnish layer corresponding to the subsequent transfer. The substrate 71 is cured by the curing device 61 in the second curing zone 62, thereby stabilizing the related layer structure formed around the color pattern. In the first transfer zone 42, the transfer device 41 performs a transfer on the substrate 71, applying the transfer to the substrate 71 after curing in the second curing zone 62, thus clarifying the positional relationship between the transfer film and the color pattern, further enhancing the surface texture and layering effect of the color pattern. In the third inkjet zone 32, the first varnish nozzle sprays a protective varnish layer onto the surface of the substrate 71 to cover and protect the surface structure formed by the aforementioned transfer and inkjet printing. The substrate 71 is then cured by the curing device 61 in the third curing zone 62, thus completing the overall processing flow.

[0057] Please see Figure 1As a specific embodiment of the digital powder transfer 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 62, a first transfer area 42, a second printing area 32, and a second curing area 62 in sequence along the flow direction of the substrate 71; in the first printing area 32, the white ink printhead and the color ink printhead respectively print a white ink layer and a colored pattern on the substrate 71; the first varnish printhead sprays a transfer varnish layer on the area of ​​the colored pattern that needs to be transferred for the first time, and the first varnish printhead sprays a barrier varnish layer on the area that does not need to be transferred for the first time; when the ink printed by the white ink printhead and the color ink printhead is a non-viscous ink, the barrier varnish layer may not be sprayed; wherein, the first varnish printhead can perform multiple superimposed printing as needed. Thus, within the first printing zone 32, the white ink layer, the colored pattern, and the transfer varnish layer and / or barrier varnish layer are concentrated and formed, allowing multiple printing-related layer structures to be constructed in the same area, thereby providing a clear basis for subsequent powder spraying, curing, and transfer printing. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the colored pattern and / or transfer varnish layer, allowing the powder spraying process to directly act on the colored pattern and / or transfer varnish layer formed in the first printing zone 32, thereby achieving a continuous connection between the printing and powder spraying processes, and enabling the powder layer to be formed in the area where the colored pattern and / or transfer varnish layer is located. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, thereby stabilizing the aforementioned structures of the white ink layer, colored pattern, transfer varnish layer, barrier varnish layer, and powder layer formed by the white ink printhead, colored ink printhead, first varnish printhead, and powder spraying device 51. In the first transfer zone 42, the transfer device 41 transfers the transfer film onto the substrate 71, thereby clarifying the layering relationship between the transfer film and the color pattern and enhancing the surface texture and layering effect of the color pattern. In the second printing zone 32, the first varnish nozzle sprays a protective varnish layer onto the surface of the substrate 71, forming a protective varnish layer on the surface of the substrate 71 after the transfer is completed, thus covering and protecting the surface structure formed by the aforementioned printing, powder spraying, and transfer. The substrate 71 is then cured by the curing device 61 in the second curing zone 62, thereby stabilizing the subsequently formed protective varnish layer and completing the overall processing flow.

[0058] Please see Figure 1As a specific embodiment of the digital powder transfer printing method provided by the present invention, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a second transfer area 42, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; in the first printing area 32, the first varnish nozzle sprays a transfer varnish layer on the area of ​​the substrate 71 that needs to be transferred for the first time, the first varnish nozzle sprays a barrier varnish layer on the area that does not need to be transferred for the first time, or only sprays a transfer varnish layer on the area that needs to be transferred; the transfer varnish layer can be superimposed and printed multiple times as needed, thereby first forming a layer structure related to subsequent powder spraying and transfer on the transparent substrate 71. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured transfer varnish layer, thus applying the powder spraying process to the transfer varnish layer formed in the first printing zone 32. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, thereby stabilizing the related structure formed by the aforementioned transfer varnish layer and powder layer. In the first transfer zone 42, the transfer device 41 transfers the first transfer film onto the substrate 71, allowing the first transfer film to enter the entire continuous processing flow. In the second printing zone 32, the inkjet head prints a mirrored color pattern onto the substrate 71, forming a mirrored color pattern on the transparent substrate 71. In the second powder spraying zone 52, the powder spraying device 51 applies a powder layer to the color pattern and / or the transfer varnish layer. The substrate 71 is cured by the curing device 61 in the second curing zone 62, and then excess powder is removed, thereby stabilizing the related structure formed in the second stage. In the second transfer zone 42, the transfer device 41 transfers the second transfer film onto the substrate 71 again. In the third printing zone 32, the white ink printhead prints a white ink layer on the back side of the colored pattern as a white ink underlay. The substrate 71 is then cured by the curing device 61 in the third curing zone 62, thus completing the overall processing flow.

[0059] Please see Figure 1As a specific embodiment of the digital powder transfer printing method provided by the present invention, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; in the first printing area 32, the first varnish nozzle sprays a transfer varnish layer on the area of ​​the substrate 71 that needs to be transferred for the first time, the first varnish nozzle sprays a barrier varnish layer on the area that does not need to be transferred for the first time, or only sprays a transfer varnish layer on the area that needs to be transferred; the transfer varnish layer and / or the barrier varnish layer can be superimposed and printed multiple times as needed, so that the transparent substrate 71 first forms a layer structure related to the subsequent powder spraying and transfer. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured transfer varnish layer, thus directly connecting the powder spraying process with the transfer varnish layer. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, thereby stabilizing the related layer structure formed in the first stage. In the first transfer zone 42, the transfer device 41 transfers a transfer film onto the substrate 71, forming a transfer film on the transparent substrate 71. In the second printing zone 32, the inkjet printhead prints a mirrored color pattern onto the substrate 71, forming a mirrored color pattern on the transparent substrate 71. In the second powder spraying zone 52, the powder spraying device 51 applies a powder layer to the color pattern, allowing the second powder spraying process to directly act on the mirrored color pattern. The substrate 71 is cured by the curing device 61 in the second curing zone 62, and then excess powder is removed, thereby stabilizing the related layer structure formed in the second stage. In the third printing zone 32, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the colored pattern. The substrate 71 is then cured by the curing device 61 in the third curing zone 62, thus completing the overall processing flow.

[0060] Please see Figure 1As a specific embodiment of the digital powder transfer printing method provided by the present invention, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, a second curing area 62, a second transfer area 42, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; in the first printing area 32, the first varnish nozzle sprays a transfer varnish layer on the area of ​​the substrate 71 that needs to be transferred for the first time, the first varnish nozzle sprays a barrier varnish layer on the area that does not need to be transferred for the first time, or only sprays a transfer varnish layer on the area that needs to be transferred; the transfer varnish layer and / or the barrier varnish layer can be superimposed and printed multiple times as needed, so that the transparent substrate 71 forms a layer structure related to the first transfer before entering the subsequent process. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured transfer varnish layer, allowing the powder spraying process to directly act on the transfer varnish layer formed by the first varnish printhead, and ensuring the powder layer mates with the transfer varnish layer. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, thereby stabilizing the related structures of the transfer varnish layer, barrier varnish layer, and powder layer formed in the first printing zone 32 and the first powder spraying zone 52. In the first transfer zone 42, the transfer device 41 transfers a transfer film onto the substrate 71, forming a transfer film on the transparent substrate 71, thus providing a first transfer effect before the formation of a mirrored color pattern. In the second printing zone 32, the ink printhead prints a mirrored color pattern onto the substrate 71, forming a mirrored color pattern on the transparent substrate 71, so that a positive pattern effect is presented when viewed through the transparent substrate 71. The substrate 71 is cured by the curing device 61 in the second curing zone 62, stabilizing the mirrored color pattern formed in the second stage. In the second transfer zone 42, the transfer device 41 transfers the image onto the substrate 71, clarifying the layered relationship between the transfer film and the color pattern, and creating a transfer effect on different sides of the mirrored color pattern in conjunction with the first transfer. In the third printing zone 32, a white ink printhead sprays a white ink layer onto the back side of the color pattern as a white ink underlay, enhancing the display foundation of the mirrored color pattern. The substrate 71 is then cured by the curing device 61 in the third curing zone 62, completing the overall processing flow.

[0061] Please see Figure 1As a specific embodiment of the digital powder transfer printing method provided by the present invention, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a second printing area 32, a second curing area 62, a first transfer area 42, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; in the first printing area 32, the first varnish nozzle sprays a transfer varnish layer on the area of ​​the substrate 71 that needs to be transferred for the first time, and the first varnish nozzle sprays a barrier varnish layer on the area that does not need to be transferred for the first time, or only sprays a transfer varnish layer on the area that needs to be transferred; the transfer varnish layer and / or the barrier varnish layer can be superimposed and printed multiple times as needed, so that the transparent substrate 71 first forms a layer structure related to the subsequent transfer. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured transfer varnish layer, allowing the powder spraying process to act on the transfer varnish layer formed by the first varnish printhead, and ensuring that the powder layer and the transfer varnish layer are in contact. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, thereby stabilizing the related structures of the transfer varnish layer, barrier varnish layer, and powder layer formed in the first stage. In the second printing zone 32, the color ink printhead prints a mirrored color pattern onto the substrate 71; the first varnish printhead sprays a transfer varnish layer on the areas requiring the first transfer, and sprays a barrier varnish layer or does not spray a barrier varnish layer on the areas not requiring the first transfer, so that a mirrored color pattern and the layer structure related to subsequent transfers are formed on the transparent substrate 71, and a corresponding relationship is established between the mirrored color pattern and the transfer varnish layer. The substrate 71 is cured by the curing device 61 in the second curing zone 62, stabilizing the mirrored color pattern, transfer varnish layer, and barrier varnish-related structures formed in the second stage. In the first transfer zone 42, the transfer device 41 performs transfer on the substrate 71, applying the transfer to the substrate 71 after curing in the second curing zone 62, and forming a transfer film on the transfer area corresponding to the mirrored color pattern. This clarifies the relative positional relationship between the transfer film and the color pattern, and, in conjunction with the transparent substrate 71, achieves the transfer effect when viewed from the front after reverse printing. In the third inkjet zone 32, a white ink printhead sprays a white ink layer as a white ink underlay on the back side of the color pattern to enhance the display base of the mirrored color pattern. The substrate 71 is then cured by the curing device 61 in the third curing zone 62, thus completing the overall processing flow.

[0062] Please see Figure 1In one specific embodiment of the digital powder transfer printing method provided by the present invention, the substrate 71 is a transparent substrate 71; the conveying channel 21 is sequentially provided with a first printing area 32, a first curing area 62, a first transfer area 42, a second printing area 32, a first powder spraying area 52, a second curing area 62, a third printing area 32, and a third curing area 62 along the flow direction of the substrate 71; in the first printing area 32, the first varnish nozzle sprays a transfer varnish layer on the area of ​​the substrate 71 that needs to be transferred for the first time, and the first varnish nozzle sprays a barrier varnish layer on the area that does not need to be transferred for the first time, or only sprays a transfer varnish layer on the area that needs to be transferred; the transfer varnish layer and / or the barrier varnish layer can be sprayed multiple times as needed, so that the relevant layer structure required for subsequent transfer is first formed on the surface of the transparent substrate 71. The substrate 71 is cured by the curing device 61 in the first curing area 62, so that the aforementioned relevant layer structure formed by the first varnish nozzle is stabilized. In the first transfer zone 42, the transfer device 41 transfers the transfer film onto the substrate 71, forming the transfer film on the substrate 71 in the initial stage. In the second printing zone 32, the color ink printhead prints a mirrored color pattern onto the substrate 71, thus forming a mirrored color pattern on the transparent substrate 71. In the first powder spraying zone 52, the powder spraying device 51 coats a powder layer onto the color pattern, allowing the powder spraying process to directly act on the color pattern. The substrate 71 is cured by the curing device 61 in the second curing zone 62, and then excess powder is removed, thereby stabilizing the color pattern and powder layer structure formed in the second stage. In the third printing zone 32, the white ink printhead prints a white ink layer on the back side of the color pattern as a white ink underlay. The substrate 71 is cured by the curing device 61 in the third curing zone 62, thus completing the overall processing flow.

[0063] Please see Figure 1As a specific embodiment of the digital powder transfer printing method provided by the present invention, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, and a second curing area 62 in sequence along the flow direction of the substrate 71; in the first printing area 32, the color ink printhead prints a mirrored color pattern onto the substrate 71, the first varnish printhead sprays a transfer varnish layer on the area of ​​the color pattern that needs to be transferred for the first time, the first varnish printhead sprays a barrier varnish layer on the area that does not need to be transferred for the first time, or only sprays a transfer varnish layer on the area that needs to be transferred; the transfer varnish layer and / or the barrier varnish layer can be superimposed and printed multiple times as needed, so that the mirrored color pattern and the layer structure related to the transfer are formed in the same area. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the colored pattern and / or the transfer varnish layer, allowing the powder spraying process to directly act on the aforementioned layer structure formed by the color ink printhead and the first varnish printhead. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, thereby stabilizing the layer structure formed by the first printing zone 32 and the first powder spraying zone 52. In the first transfer zone 42, the transfer device 41 transfers a transfer film onto the substrate 71, forming the transfer film on the substrate 71 in the previous process. In the second printing zone 32, the white ink printhead sprays a white ink layer as a white ink underlay on the back side of the colored pattern, forming the white ink layer on the mirrored back side of the colored pattern. The substrate 71 is cured by the curing device 61 in the second curing zone 62, thus completing the overall processing flow.

[0064] Please see Figure 1As a specific embodiment of the digital powder transfer printing method provided by the present invention, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32 and a second curing area 62 in sequence along the flow direction of the substrate 71; in the first printing area 32, the first varnish nozzle sprays a transfer varnish layer on the area of ​​the substrate 71 that needs to be transferred for the first time, and the first varnish nozzle sprays a barrier varnish layer on the area that does not need to be transferred for the first time, or only sprays a transfer varnish layer on the area that needs to be transferred for the first time; the transfer varnish layer and / or the barrier varnish layer can be superimposed and printed multiple times as needed, so that the substrate 71 forms a layer structure related to the transfer before entering the subsequent process. In the first powder spraying zone 52, the powder spraying device 51 applies a powder layer to the incompletely cured transfer varnish layer and / or barrier varnish layer, allowing the powder spraying process to directly act on the relevant layer structure formed by the first varnish printhead. The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed, thereby stabilizing the relevant layer structure formed in the first printing zone 32 and the first powder spraying zone 52. In the first transfer zone 42, the transfer device 41 transfers a transfer film onto the substrate 71, allowing the transfer film to be formed on the substrate 71 in the previous process. Subsequently, in the second printing zone 32, the color ink printhead prints a mirrored color pattern onto the substrate 71, while the white ink printhead prints a white ink layer as a white ink underlay in the back area of ​​the color pattern, thus forming a mirrored color pattern and a white ink underlay in the same area. The substrate 71 is cured by the curing device 61 in the second curing zone 62, completing the overall processing flow.

[0065] Please see Figure 1 As a specific embodiment of the digital powder transfer printing method provided by the present invention, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32 and a second printing area 32 along the flow direction of the substrate 71; the first printing area 32 and the second printing area 32 are respectively located upstream of the curing device 61; the method includes the following steps: Step C1: in the first printing area 32, the color ink nozzle forms a first pattern on the substrate 71; Step C2: in the second printing area 32, the color ink nozzle forms a second pattern on the substrate 71.

[0066] Thus, when the substrate 71 reaches the first printing area 32, a first pattern is printed on the substrate 71, and the first pattern is used for reverse printing and viewing from the front; when the substrate 71 reaches the second printing area 32, a second pattern is printed on the substrate 71, and the second pattern is used for forward printing and viewing from the front.

[0067] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a second transfer area 42, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C010: In the first printing area 32, the inkjet head sprays a mirrored first color pattern on the substrate 71, and the first varnish print head sprays a first transfer varnish layer on the first color pattern area; Step C011: In the first powder spraying area 52, the powder spraying device 51 coats a powder layer on the incompletely cured first color pattern and / or the first transfer varnish layer; Step C012: The substrate 71 is cured by the curing device 61 in the first curing area 62; Step C013: In the first transfer area 42... 2. The transfer device 41 transfers the transfer film onto the substrate 71; Step C014: In the second printing area 32, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the first color pattern; subsequently, the color ink printhead prints a second color pattern facing forward onto the substrate 71, and the first varnish printhead prints a first protective varnish layer on the second color pattern; Step C015: In the second powder spraying area 52, the powder spraying device 51 sprays the second color pattern and / or the first protective varnish layer... A powder layer is applied to the varnish layer; Step C016: The substrate 71 is cured by the curing device 61 in the second curing zone 62; Step C017: In the second transfer zone 42, the transfer device 41 transfers the transfer film back onto the substrate 71; Step C018: In the third printing zone 32, the first varnish nozzle sprays a protective varnish layer onto the surface of the substrate 71; Step C019: The substrate 71 is cured by the curing device 61 in the third curing zone 62.

[0068] In one embodiment, "positive color pattern" means that when a color pattern is sprayed on a predetermined surface for a user to observe facing the predetermined surface, the left and right sides of the color pattern are consistent with the left and right sides observed by the user.

[0069] In one embodiment, "mirror-image color pattern" means that when a color pattern is sprayed onto a predetermined transparent surface for a user to view from the back of the predetermined transparent surface, the left and right sides of the color pattern are consistent with the left and right sides observed by the user.

[0070] In one embodiment, the substrate 71 is a transparent substrate 71; the transport channel 21 is sequentially provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, a second curing area 62, a second transfer area 42, a third printing area 32, and a third curing area 62 along the flow direction of the substrate 71; and proceeds according to the following steps: Step C020: In the first printing area 32, the ink printhead sprays a mirrored first color pattern onto the substrate 71, and the first varnish printhead sprays a first transfer varnish layer onto the first color pattern area; Step C021: In the first powder spraying area 52, the powder spraying device 51 coats a powder layer onto the incompletely cured first color pattern and / or the first transfer varnish layer; Step C022: The substrate 71 is cured by the curing device 61 via the first curing area 62; Step C023 Step C024: In the first transfer zone 42, the transfer device 41 transfers the first transfer film onto the substrate 71; Step C025: In the second printing zone 32, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the first color pattern; subsequently, the color ink printhead prints a second color pattern on the substrate 71 in the forward direction, and the first varnish printhead prints a second transfer varnish layer on the second color pattern; Step C026: The substrate 71 is cured by the curing device 61 in the second curing zone 62; Step C027: In the second transfer zone 42, the transfer device 41 performs a transfer on the substrate 71, so that the second transfer film is formed above the second color pattern; Step C028: In the third printing zone 32, the first varnish printhead prints a protective varnish layer on the surface of the substrate 71; Step C029: The substrate 71 is cured by the curing device 61 in the third curing zone 62.

[0071] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is sequentially provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a third printing area 32, and a third curing area 62 along the flow direction of the substrate 71; including the following processing steps: Step C030: In the first printing area 32, the inkjet head prints a mirrored first color pattern on the substrate 71, and the first varnish print head sprays a transfer varnish layer on the first color pattern area; Step C031: In the first powder spraying area 52, the powder spraying device 51 coats a powder layer on the incompletely cured first color pattern and / or transfer varnish layer; Step C032: The substrate 71 is cured by the curing device 61 through the first curing area 62; Step C 033: In transfer zone 42, transfer device 41 transfers the transfer film onto substrate 71; Step C034: In the second printing zone 32, white ink printhead prints a white ink layer as a white ink underlay on the back side of the first color pattern; subsequently, color ink printhead prints a forward-facing second color pattern onto substrate 71, and a first varnish printhead prints a first protective varnish layer onto the second color pattern; Step C035: In the second powder spraying zone 52, powder spraying device 51 coats a powder layer onto the second color pattern and / or the first protective varnish layer; Step C036: Substrate 71 is cured by curing device 61 in the second curing zone 62; Step C037: In the third printing zone 32, first varnish printhead prints a second protective varnish layer on the surface of substrate 71; Step C038: Substrate 71 is cured by curing device 61 in the third curing zone 62.

[0072] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C040: In the first printing area 32, the ink printhead prints a mirrored first color pattern on the substrate 71, the first varnish printhead sprays a first transfer varnish layer on the area of ​​the first color pattern that needs to be transferred for the first time, the first varnish printhead sprays a barrier varnish layer on the area that does not need to be transferred for the first time, or only sprays the first transfer varnish layer on the area that needs to be transferred; the first transfer varnish layer and / or the barrier varnish layer can be superimposed and printed multiple times as needed; Step C041: In the first powder spraying area 52, the powder spraying device 51 sprays powder onto the first color pattern and / or the first transfer varnish layer that is not fully cured. A powder layer is applied to the oil layer; Step C042: The substrate 71 is cured by the curing device 61 in the first curing zone 62; Step C043: In the first transfer zone 42, the transfer device 41 transfers the transfer film onto the substrate 71; Step C044: In the second printing zone 32, the white ink printhead prints a white ink layer as a white ink underlay in the back area of ​​the first color pattern; Subsequently, the color ink printhead prints a second color pattern in the front direction onto the substrate 71, and the first varnish printhead prints a second color pattern onto the second color pattern. Step C045: In the second powder spraying area 52, the powder spraying device 51 applies a powder layer to the second colored pattern and / or the first protective varnish layer; Step C046: The substrate 71 is cured by the curing device 61 in the second curing area 62; Step C047: In the third printing area 32, the first varnish nozzle sprays a second protective varnish layer onto the surface of the substrate 71; Step C048: The substrate 71 is cured by the curing device 61 in the third curing area 62.

[0073] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is sequentially provided with a first printing area 32, a first curing area 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a third printing area 32, and a third curing area 62 along the flow direction of the substrate 71; including the following processing steps: Step C050: In the first printing area 32, the inkjet head prints a mirrored first color pattern on the substrate 71, and the first varnish print head sprays a transfer varnish layer on the first color pattern area; the transfer varnish layer can be stacked multiple times as needed; Step C051: The substrate 71 is cured by the curing device 61 in the first curing area 62; Step C052: In the first transfer area 42, the transfer device 41 transfers the transfer film onto the substrate 71, so that... A transfer film is placed above the first color pattern; Step C053: In the second printing area 32, a white ink printhead prints a white ink layer as a white ink underlay on the back side of the first color pattern; subsequently, a color ink printhead prints a forward-facing second color pattern on the substrate 71, and a first varnish printhead prints a first protective varnish layer on the second color pattern; Step C054: In the second powder spraying area 52, a powder spraying device 51 coats a powder layer on the second color pattern and / or the first protective varnish layer; Step C055: The substrate 71 is cured by the curing device 61 in the second curing area 62, and then excess powder is removed; Step C056: In the third printing area 32, a first varnish printhead prints a second protective varnish layer on the surface of the substrate 71; Step C057: The substrate 71 is cured by the curing device 61 in the third curing area 62.

[0074] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a second printing area 32, a second curing area 62, a first transfer area 42, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C060: In the first printing area 32, the ink printhead prints a mirrored first color pattern on the substrate 71, and the first varnish printhead prints a first transfer varnish layer and / or a barrier varnish layer in the area of ​​the first color pattern, or prints a transfer varnish layer only in the area where transfer is required; the first transfer varnish layer and / or barrier varnish layer can be superimposed and printed multiple times as needed; Step C061: In the first powder spraying area 52, the powder spraying device 51 sprays powder onto the incompletely cured first color pattern and / or first transfer varnish. Step C062: The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed; Step C063: In the second printing zone 32, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the first color pattern; subsequently, the color ink printhead prints a second color pattern on the substrate 71 in the front direction, and the first varnish printhead prints a second transfer varnish layer on the second color pattern; Step C064: The substrate 71 is cured by the curing device 61 in the second curing zone 62; Step C065: In the first transfer zone 42, the transfer device 41 transfers the transfer film onto the substrate 71; Step C066: In the third printing zone 32, the first varnish printhead prints a protective varnish layer on the surface of the substrate 71; Step C067: The substrate 71 is cured by the curing device 61 in the third curing zone 62.

[0075] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, and a second curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C070: In the first printing area 32, the color ink printhead prints a mirrored first color pattern on the substrate 71, the first varnish printhead prints a first protective varnish layer and / or a barrier varnish layer in the first color pattern area, and sprays a transfer varnish layer in the area to be transferred; Step C071: In the first powder spraying area 52, the powder spraying device 51 prints a first color pattern on the substrate 71. A powder layer is applied to the pattern and / or transfer varnish layer; Step C072: The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed; Step C073: In the first transfer zone 42, the transfer device 41 transfers the transfer film onto the substrate 71; Step C074: In the second printing zone 32, the white ink printhead prints a white ink layer as a white ink underlay in the back area of ​​the first color pattern; Subsequently, the color ink printhead prints a second color pattern in the front direction onto the substrate 71, and the first varnish printhead prints a second protective varnish layer on the surface of the substrate 71; Step C075: The substrate 71 is cured by the curing device 61 in the second curing zone 62.

[0076] In one embodiment, the substrate 71 is a transparent substrate 71; the transport channel 21 is provided with a first printing area 32, a first curing area 62, a first transfer area 42, a second printing area 32, and a second curing area 62 in sequence along the flow direction of the substrate 71; and the following steps are performed: Step C080: In the first printing area 32, the color ink printhead prints a mirrored first color pattern on the substrate 71, and the first varnish printhead prints a first protective varnish layer in the first color pattern area; Step C081: The substrate 71 undergoes the first curing... Zone 62 is cured by curing device 61; Step C082: In the first transfer zone 42, the transfer device 41 transfers the transfer film onto the substrate 71; Step C083: In the second inkjet zone 32, the white ink printhead prints a white ink layer as a white ink underlay in the back area of ​​the first color pattern; Subsequently, the color ink printhead prints a second color pattern in the front direction onto the substrate 71, and the first varnish printhead prints a second protective varnish layer on the surface of the substrate 71; Step C084: The substrate 71 is cured by curing device 61 in the second curing zone 62.

[0077] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a second printing area 32, and a second curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C090: In the first printing area 32, the color ink printhead prints a mirrored first color pattern on the substrate 71, and the first varnish printhead prints a first protective varnish layer in the first color pattern area; Step C091: In the first powder spraying area 52, the powder spraying device 51 prints a first color pattern on the first color pattern area. A powder layer is applied to the pattern and / or the first protective varnish layer; Step C092: The substrate 71 is cured by the curing device 61 in the first curing zone 62, and then excess powder is removed; Step C093: In the second printing zone 32, the white ink printhead prints a white ink layer as a white ink underlay in the back area of ​​the first color pattern; Subsequently, the color ink printhead prints a second color pattern in the front direction on the substrate 71, and the first varnish printhead prints a second protective varnish layer on the surface of the substrate 71; Step C094: The substrate 71 is cured by the curing device 61 in the second curing zone 62.

[0078] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a second printing area 32, and a curing area 62 in sequence along the flow direction of the substrate 71; the process includes the following steps: Step C100: In the first printing area 32, the color ink printhead prints a mirrored first color pattern on the substrate 71, and the first varnish printhead prints a first protective varnish layer on the substrate 71. The first protective varnish layer can be printed multiple times as needed; Step C101: In the second printing area 32, the white ink printhead prints a white ink layer as a white ink underlay in the back area of ​​the first color pattern; subsequently, the color ink printhead prints a forward second color pattern on the substrate 71, and the first varnish printhead prints a second protective varnish layer on the second color pattern; Step C102: The substrate 71 is cured by the curing device 61 in the curing area 62, completing the printing.

[0079] In one embodiment, the substrate 71 is a transparent substrate 71; the transport channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a second transfer area 42, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C110: In the first printing area 32, the color ink printhead... A mirrored first color pattern is printed onto the substrate 71, and a first varnish nozzle prints a first transfer varnish layer and / or a barrier varnish layer, or prints a transfer varnish layer only in the area where transfer is required; Step C111: In the first powder spraying area 52, the powder spraying device 51 applies a powder layer to the incompletely cured first color pattern and / or first transfer varnish layer; Step C112: The substrate 71 is cured by the curing device 61 in the first curing area 62, and then excess powder is removed; Step C113 Step C114: In the first transfer zone 42, the transfer device 41 transfers the transfer film onto the substrate 71; Step C115: In the second printing zone 32, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the first color pattern; subsequently, the color ink printhead prints a second color pattern facing forward onto the substrate 71, and the first varnish printhead prints a second transfer varnish layer on the second color pattern; Step C116: In the second powder spraying zone 52, the powder spraying device 51 sprays powder onto the second color pattern and / or the second transfer... A powder layer is applied to the varnish layer; Step C116: The substrate 71 is cured by the curing device 61 in the second curing zone 62, and then excess powder is removed; Step C117: In the second transfer zone 42, the transfer device 41 transfers the transfer film back onto the substrate 71; Step C118: In the third printing zone 32, the first varnish nozzle sprays a protective varnish layer onto the surface of the substrate 71; Step C119: The substrate 71 is cured by the curing device 61 in the third curing zone 62.

[0080] In one embodiment, the substrate 71 is a transparent substrate 71; the transport channel 21 is sequentially provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, a second curing area 62, a second transfer area 42, a third printing area 32, and a third curing area 62 along the flow direction of the substrate 71; including the following processing steps: Step C120: In the first printing area 32, the inkjet head sprays a mirrored first color pattern onto the substrate 71, and the first varnish print head sprays a first transfer varnish layer and / or a barrier varnish layer, or only sprays the first transfer varnish layer in the area where transfer is required; Step C121: In the first powder spraying area 52, the powder spraying device 51 coats a powder layer onto the incompletely cured first color pattern and / or the first transfer varnish layer; Step C122: The substrate 71 is cured by the curing device 61 in the first curing area 62, and then removed. Excess powder; Step C123: In the first transfer area 42, the transfer device 41 transfers the first transfer film onto the substrate 71; Step C124: In the second inkjet area 32, the white ink printhead sprays a white ink layer as a white ink underlay in the back area of ​​the first color pattern; subsequently, the color ink printhead sprays a second color pattern in the front direction onto the substrate 71, and the first varnish printhead sprays a second transfer varnish layer onto the second color pattern; Step C125: The substrate 71 passes through... The second curing zone 62 is cured by the curing device 61; Step C126: In the second transfer zone 42, the transfer device 41 transfers the second transfer film onto the substrate 71, so that the second transfer film is formed above the second colored pattern; Step C127: In the third printing zone 32, the first varnish nozzle sprays a protective varnish layer onto the surface of the substrate 71; Step C128: The substrate 71 is cured by the curing device 61 in the third curing zone 62.

[0081] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C130: In the first printing area 32, the inkjet head sprays a mirrored first color pattern on the substrate 71, the first varnish head sprays a transfer varnish layer on the area where the first transfer is required, the first varnish head sprays a barrier varnish layer on the area where the first transfer is not required, or only sprays a transfer varnish layer on the area where the transfer is required; Step C131: In the first powder spraying area 52, the powder spraying device 51 coats a powder layer on the incompletely cured first color pattern and / or transfer varnish layer; Step C132: The substrate 71 passes through the first curing area 62 Curing is performed by curing device 61, and then excess powder is removed; Step C133: In the first transfer area 42, transfer device 41 transfers the transfer film onto the substrate 71; Step C134: In the second printing area 32, the white ink printhead prints a white ink layer as a white ink underlay in the back area of ​​the first color pattern; subsequently, the color ink printhead prints a second color pattern in the front direction onto the substrate 71, and the first varnish printhead prints a first protective varnish layer on the second color pattern; Step C13 5: In the second powder spraying zone 52, the powder spraying device 51 applies a powder layer to the second colored pattern and / or the first protective varnish layer; Step C136: The substrate 71 is cured by the curing device 61 in the second curing zone 62, and then excess powder is removed; Step C137: In the third printing zone 32, the first varnish nozzle sprays the second protective varnish layer onto the surface of the substrate 71; Step C138: The substrate 71 is cured by the curing device 61 in the third curing zone 62.

[0082] In one embodiment, the substrate 71 is a transparent substrate 71; the transport channel 21 is provided with a first printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C140: In the first printing area 32, the inkjet head prints a mirrored first color pattern on the substrate 71, the first varnish print head sprays a transfer varnish layer on the area where the first transfer is required, the first varnish print head sprays a barrier varnish layer on the area where the first transfer is not required, or only sprays a transfer varnish layer on the area where the transfer is required; Step C141: In the first powder spraying area 52, the powder spraying device 51 coats a powder layer on the incompletely cured first color pattern and / or transfer varnish layer; Step C142: The substrate 71 passes through the first curing area 62 Curing is performed by curing device 61, and then excess powder is removed; Step C143: In the first transfer area 42, the transfer device 41 transfers the transfer film onto the substrate 71; Step C144: In the second printing area 32, the white ink printhead prints a white ink layer as a white ink underlay in the back area of ​​the first color pattern; subsequently, the color ink printhead prints a second color pattern in the front direction onto the substrate 71, and the first varnish printhead prints a first protective varnish layer on the second color pattern; Step C14 5: In the second powder spraying zone 52, the powder spraying device 51 applies a powder layer to the second colored pattern and / or the first protective varnish layer; Step C146: The substrate 71 is cured by the curing device 61 in the second curing zone 62, and then excess powder is removed; Step C147: In the third printing zone 32, the first varnish nozzle sprays the second protective varnish layer onto the surface of the substrate 71; Step C148: The substrate 71 is cured by the curing device 61 in the third curing zone 62.

[0083] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first curing area 62, a first transfer area 42, a second printing area 32, a second powder spraying area 52, a second curing area 62, a third printing area 32, and a third curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C150: In the first printing area 32, the color ink printhead prints a mirrored first color pattern on the substrate 71, the first varnish printhead sprays a transfer varnish layer on the area where the first transfer is required, and the first varnish printhead sprays a barrier varnish layer on the area where the first transfer is not required; Step C151: The substrate 71 is cured by the curing device 61 in the first curing area 62; Step C152: In the first transfer area 42, the transfer... The apparatus 41 transfers the transfer film onto the substrate 71; Step C153: In the second printing area 32, the white ink printhead prints a white ink layer as a white ink underlay in the back area of ​​the first color pattern; subsequently, the color ink printhead prints a second color pattern in the front direction onto the substrate 71, and the first varnish printhead sprays a transfer varnish layer onto the second color pattern; Step C154: In the second powder spraying area 52, the powder spraying device 51 coats a powder layer onto the second color pattern and / or the transfer varnish layer; Step C155: After the substrate 71 is cured by the curing device 61 in the second curing area 62, excess powder is removed; Step C156: In the third printing area 32, the first varnish printhead prints a protective varnish layer on the surface of the substrate 71; Step C157: The substrate 71 is cured by the curing device 61 in the third curing area 62.

[0084] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a first powder spraying area 52, a second printing area 32, a first transfer area 42, a third printing area 32, and a curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C160: In the first printing area 32, the color ink printhead prints a mirrored first color pattern on the substrate 71, the first varnish printhead sprays a transfer varnish layer on the area to be transferred for the first time, and the first varnish printhead sprays a barrier varnish layer on the area not to be transferred for the first time; Step C161: In the first powder spraying area 52, the powder spraying device 51 sprays a first powder spraying area on the substrate 71 before it is fully cured. A powder layer is applied to a colored pattern and / or a transfer varnish layer; Step C162: In the second printing area 32, a white ink printhead prints a white ink layer as a white ink underlay on the back side of the first colored pattern; subsequently, a colored ink printhead prints a second colored pattern facing forward onto the substrate 71, and a first varnish printhead prints a first protective varnish layer on the second colored pattern; Step C163: In the first transfer area 42, a transfer device 41 transfers a transfer film onto the substrate 71; Step C164: In the third printing area 32, a first varnish printhead prints a protective varnish layer on the surface of the substrate 71; Step C165: The substrate 71 is cured by the curing device 61 in the curing area 62 to complete the printing.

[0085] In one embodiment, the substrate 71 is a transparent substrate 71; the conveying channel 21 is provided with a first printing area 32, a second printing area 32, a powder spraying area 52, a first transfer area 42, a third printing area 32, and a curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C170: In the first printing area 32, the color ink printhead prints a mirrored first color pattern on the substrate 71, the first varnish printhead sprays a transfer varnish layer on the area where the first transfer is required, and the first varnish printhead sprays a barrier varnish layer on the area where the first transfer is not required; Step C171: In the second printing area 32, the white ink printhead prints a white ink on the back side of the first color pattern. A white ink layer is printed as a white ink underlay; subsequently, a color ink printhead prints a positive second color pattern onto the substrate 71, and a first varnish printhead prints a first protective varnish layer onto the second color pattern; step C172: in the powder spraying area 52, the powder spraying device 51 coats a powder layer onto the second color pattern and / or the first protective varnish layer thereon; step C173: in the first transfer area 42, the transfer device 41 transfers a transfer film onto the substrate 71; step C174: in the third printing area 32, the first varnish printhead prints a second protective varnish layer onto the surface of the substrate 71; step C175: the substrate 71 is cured by the curing device 61 in the curing area 62 to complete the printing.

[0086] In one embodiment, the substrate 71 is a transparent substrate 71; the transport channel 21 is provided with a first printing area 32, a second printing area 32, a first curing area 62, a first transfer area 42, a third printing area 32, and a second curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C180: In the first printing area 32, the color ink printhead prints a mirrored first color pattern on the substrate 71, the first varnish printhead sprays a transfer varnish layer on the area where the first transfer is required, and the first varnish printhead sprays a barrier varnish layer on the area where the first transfer is not required; Step C181: In the second printing area 32, the white ink printhead prints a first color pattern on the first color pattern A white ink layer is sprayed onto the back side area as a white ink underlay; subsequently, a color ink printhead sprays a second color pattern onto the substrate 71 in the forward direction, and a first varnish printhead sprays a first protective varnish layer onto the second color pattern; step C182: the substrate 71 is cured by the curing device 61 in the first curing zone 62; in the first transfer zone 42, the transfer device 41 transfers a transfer film onto the substrate 71, so that the transfer film is formed above the second color pattern; step C183: in the third printing zone 32, the first varnish printhead sprays a second protective varnish layer onto the surface of the substrate 71; step C184: the substrate 71 is cured by the curing device 61 in the second curing zone 62 to complete the printing.

[0087] In one embodiment, the substrate 71 is a transparent substrate 71; the transport channel 21 is provided with a first printing area 32, a second printing area 32, a first powder spraying area 52, a first curing area 62, a first transfer area 42, a third printing area 32, and a second curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C190: In the first printing area 32, the color ink printhead prints a mirrored first color pattern on the substrate 71, the first varnish printhead sprays a transfer varnish layer on the area to be transferred for the first time, and the first varnish printhead sprays a barrier varnish layer on the area not to be transferred for the first time; Step C191: In the second printing area 32, the white ink printhead prints a white ink layer as a white ink underlay on the back side area of ​​the first color pattern; subsequently, the color ink printhead... Step C192: In the first powder spraying area 52, the powder spraying device 51 applies a powder layer to the second color pattern and / or the first protective varnish layer; Step C193: The substrate 71 is cured by the curing device 61 in the first curing area 62, and then excess powder is removed; Step C194: In the first transfer area 42, the transfer device 41 transfers a transfer film onto the substrate 71 and / or the area adjacent to the second color pattern; Step C195: In the third printing area 32, the first varnish spraying head sprays a second protective varnish layer onto the surface of the substrate 71; Step C196: The substrate 71 is cured by the curing device 61 in the second curing area 62.

[0088] In one embodiment, the substrate 71 is a transparent substrate 71; the transport channel 21 is provided with a first printing area 32, a second printing area 32, a third printing area 32 and a curing area 62 in sequence along the flow direction of the substrate 71; including the following processing steps: Step C200: In the first printing area 32, the color ink printhead prints a mirrored first color pattern on the substrate 71, the first varnish printhead sprays a transfer varnish layer on the area where the first transfer is required, and the first varnish printhead sprays a barrier varnish layer on the area where the first transfer is not required, and the transfer varnish... The ink layer can be layered and printed multiple times as needed; Step C201: In the second printing area 32, the white ink printhead prints a white ink layer as a white ink underlay in the back area of ​​the first color pattern; then, the color ink printhead prints a second color pattern in the front direction on the substrate 71, and the first varnish printhead prints a first protective varnish layer on the second color pattern; Step C202: In the third printing area 32, the first varnish printhead prints a second protective varnish layer on the surface of the substrate 71; Step C203: The substrate 71 is cured by the curing device 61 in the curing area 62.

[0089] This invention also provides a digital powder transfer printing machine comprising: a frame 1, a conveyor belt 2, a drive unit, a printing device 31, a transfer device 41, a powder spraying device 51, and a curing device 61; the conveyor belt 2 is used to transport the substrate 71; a conveying channel 21 for transporting the substrate 71 is formed above the conveyor belt 2; within the conveying channel 21, at least one printing area 32, at least one transfer area 42, at least one powder spraying area 52, and at least one curing area 62 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 is used to print onto the substrate 71 in the printing area 32; 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 71 reaches the printing area 32, the printing device 31 prints onto the substrate 71 in the printing area 32 to form a printed layer. The transfer device 41 is used to lay and transfer the transfer film onto the substrate 71 in the transfer area 42; the transfer device 41 and the transfer area 42 correspond one-to-one; when the substrate 71 reaches the transfer area 42, the transfer device 41 transfers the transfer film onto the surface of the substrate 71; the powder spraying device 51 is used to form a powder layer on the substrate 71 in the powder spraying area 52; 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 71 reaches the transfer area 42, the transfer device 41 transfers the transfer film onto the surface of the substrate 71; the powder spraying device 51 is used to form a powder layer on the substrate 71 in the powder spraying area 52; the powder spraying device 51 includes: a second varnish nozzle and a powder sprayer; when the substrate 71 reaches the transfer area 42, the transfer device 41 transfers the transfer film onto the surface of the substrate 71; the transfer device 41 is used to lay and transfer the transfer film onto the substrate 71 in the transfer area 42; the transfer device 41 and the transfer area 42 correspond one-to-one; the powder spraying device 51 includes: a second varnish nozzle and a powder sprayer; when the substrate 71 reaches the transfer area 42, the transfer device 41 transfers the transfer film onto the substrate 71 in the transfer area 42; the transfer device 41 and the transfer area 42 correspond one-to-one; the transfer device 41 transfers the transfer film onto the surface of the substrate 71; ... When the printed material 71 reaches the powder spraying area 52, the second varnish nozzle can spray varnish onto the printed material 71 in the powder spraying area 52 to form a varnish underlayer. The powder sprayer can spray powder onto the varnish underlayer. The varnish underlayer and the powder mix to form a powder layer. The curing device 61 is used to cure the material sprayed by the printing device 31. When the printed material 71 reaches the curing area 62, the curing device 61 cures the printed layer and / or the powder layer. The curing device 61 and the curing area 62 correspond one-to-one.

[0090] 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 transfer printing method, characterized in that, Includes the following steps: Step S1: Provide a conveyor channel for conveying the substrate; within the conveyor channel, at least one printing area, at least one transfer area, at least one powder spraying area and at least one curing area are respectively provided in the conveying direction of the conveyor channel; Step S2: Provide the printing device; 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 prints on the substrate in the printing area to form a printing layer. Step S3: Provide a transfer device; the transfer device and the transfer area correspond one-to-one; when the substrate arrives at the transfer area, the transfer device transfers the transfer film onto the surface of the substrate; Step S4: 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; Step S5: 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 transfer 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 first transfer area, a second printing area, a second powder spraying area, a second curing area, a second transfer area, a third printing area, and a third curing area along the flow direction of the substrate; including the following processing steps: Step A10: In the first printing area, the white ink printhead prints a white ink layer onto the substrate, and the first varnish printhead prints a transfer varnish layer onto the areas of the white ink layer that require the first transfer, and the first varnish printhead prints a barrier varnish layer onto the areas that do not require the first transfer; when the white ink is a non-sticky ink, the barrier varnish layer may not be printed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed; Step A11: In the first powder spraying area, the powder spraying device applies the powder layer to the incompletely cured white ink layer and / or the transfer varnish layer; Step A12: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step A13: In the first transfer area, the transfer device transfers the first transfer film onto the substrate; Step A14: In the second printing area, the inkjet printhead prints a color pattern onto the substrate, and the first varnish printhead prints a first protective varnish layer onto the color pattern. Step A15: In the second powder spraying area, the powder spraying device applies the powder layer onto the colored pattern and / or the first protective varnish layer; Step A16: The substrate is cured by the curing device in the second curing zone, and then excess powder is removed; Step A17: In the second transfer area, the transfer device transfers the second transfer film onto the substrate again; Step A18: In the third printing area, the first varnish nozzle prints a second protective varnish layer on the surface of the substrate; Step A19: The substrate is cured by the curing device in the third curing zone.

3. The digital powder transfer 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 first transfer area, a second printing area, a second curing area, a second transfer area, a third printing area, and a third curing area along the flow direction of the substrate; including the following processing steps: Step A20: In the first printing area, the white ink printhead prints a white ink layer onto the substrate, and the first varnish printhead prints a first transfer varnish layer onto the area in the white ink layer area that needs to be transferred for the first time, and the first varnish printhead prints a barrier varnish layer onto the area that does not need to be transferred for the first time; when the white ink is a non-sticky ink, the barrier varnish layer may not be printed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed; Step A21: In the first powder spraying area, the powder spraying device applies the powder layer to the incompletely cured white ink layer and / or the first transfer varnish layer; Step A22: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step A23: In the first transfer area, the transfer device transfers the first transfer film onto the substrate; Step A24: In the second printing area, the color ink printhead prints a color pattern onto the substrate, and the first varnish printhead prints a second transfer varnish layer onto the color pattern. Step A25: The substrate is cured by the curing device in the second curing zone; Step A26: In the second transfer area, the transfer device transfers the second transfer film onto the substrate; Step A27: In the third printing area, the first varnish nozzle prints a protective varnish layer on the surface of the substrate; Step A28: The substrate is cured by the curing device in the third curing zone.

4. The digital powder transfer 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 first transfer 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 flow direction of the substrate; including the following processing steps: Step A30: In the first printing area, the white ink printhead prints a white ink layer onto the substrate, and the first varnish printhead prints a transfer varnish layer onto the area in the white ink layer area that needs to be transferred for the first time, and the first varnish printhead prints a barrier varnish layer onto the area that does not need to be transferred for the first time; when the white ink is a non-sticky ink, the barrier varnish layer may not be printed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed; Step A31: In the first powder spraying area, the powder spraying device applies the powder layer to the incompletely cured white ink layer and / or the transfer varnish layer; Step A32: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step A33: In the first transfer area, the transfer device transfers the transfer film onto the substrate; Step A34: In the second printing area, the color ink printhead prints a color pattern onto the substrate, and the first varnish printhead prints a first protective varnish layer onto the color pattern. Step A35: In the second powder spraying area, the powder spraying device applies the powder layer onto the colored pattern and / or the first protective varnish layer; Step A36: The substrate is cured by the curing device in the second curing zone, and then excess powder is removed; Step A37: In the third printing area, the first varnish nozzle prints a second protective varnish layer on the surface of the substrate; Step A38: The substrate is cured by the curing device in the third curing zone.

5. The digital powder transfer 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 first transfer area, a second printing area, and a second curing area along the flow direction of the substrate; including the following processing steps: Step A40: In the first printing area, the white ink printhead prints a white ink layer onto the substrate, and the first varnish printhead prints a transfer varnish layer onto the areas of the white ink layer that require the first transfer, and the first varnish printhead prints a barrier varnish layer onto the areas that do not require the first transfer; when the white ink is a non-sticky ink, the barrier varnish layer may not be printed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times; Step A41: In the first powder spraying area, the powder spraying device applies the powder layer onto the incompletely cured white ink layer and / or the transfer varnish layer; Step A42: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step A43: In the first transfer area, the transfer device transfers the transfer film onto the substrate; Step A44: In the second printing area, the color ink printhead prints a color pattern onto the substrate, and the first varnish printhead prints a protective varnish layer onto the color pattern. Step A45: The substrate is cured by the curing device in the second curing zone.

6. The digital powder transfer printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first curing area, a first transfer area, a second printing area, a first powder spraying area, a second curing area, a third printing area, and a third curing area along the flow direction of the substrate; including the following processing steps: Step A50: In the first printing area, the white ink printhead prints a white ink layer onto the substrate, and the first varnish printhead prints a transfer varnish layer onto the area of ​​the white ink layer that needs to be transferred for the first time, and the first varnish printhead prints a barrier varnish layer onto the area that does not need to be transferred for the first time; when the white ink is a non-sticky ink, the barrier varnish layer may not be printed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed; Step A51: The substrate is cured by the curing device in the first curing zone; Step A52: In the first transfer area, the transfer device transfers the transfer film onto the substrate; Step A53: In the second printing area, the color ink printhead prints a color pattern onto the substrate, and the first varnish printhead prints a first protective varnish layer onto the color pattern. Step A54: In the first powder spraying area, the powder spraying device applies the powder layer onto the colored pattern and / or the first protective varnish layer; Step A55: The substrate is cured by the curing device in the second curing zone, and then excess powder is removed; Step A56: In the third printing area, the first varnish nozzle prints a second protective varnish layer on the surface of the substrate; Step A57: The substrate is cured by the curing device in the third curing zone.

7. The digital powder transfer printing method as described in claim 1, characterized in that, The conveying channel is sequentially provided with a first printing area, a first curing area, a first transfer area, a second printing area, a second curing area, a first powder spraying area, a third curing area, a second transfer area, a third printing area, and a fourth curing area along the flow direction of the substrate; including the following processing steps: Step A60: In the first printing area, the white ink printhead prints a white ink layer onto the substrate, and the first varnish printhead prints a transfer varnish layer onto the areas of the white ink layer that require the first transfer, and the first varnish printhead prints a barrier varnish layer onto the areas that do not require the first transfer; when the white ink is a non-sticky ink, the barrier varnish layer may not be printed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed; Step A61: The substrate is cured by the curing device in the first curing zone; Step A62: In the first transfer area, the transfer device transfers the first transfer film onto the substrate; Step A63: In the second printing area, the color ink printhead prints a color pattern onto the first transfer film, and the first varnish printhead prints a first protective varnish layer onto the color pattern. Step A64: The substrate is cured by the curing device in the second curing zone; Step A65: In the first powder spraying area, the powder spraying device applies the powder layer onto the colored pattern and / or the first protective varnish layer; Step A66: The substrate is cured by the curing device in the third curing zone, and then excess powder is removed; Step A67: In the second transfer area, the transfer device transfers the second transfer film onto the substrate; Step A68: In the third printing area, the first varnish nozzle prints a second protective varnish layer on the surface of the second transfer film; Step A69: The substrate is cured by the curing device in the fourth curing zone.

8. The digital powder transfer 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 first transfer area, a third printing area, and a third curing area along the flow direction of the substrate; including the following processing steps: Step A70: In the first printing area, the white ink printhead prints a white ink layer onto the substrate, and the first varnish printhead prints a transfer varnish layer onto the area of ​​the white ink layer that needs to be transferred for the first time, and the first varnish printhead prints a barrier varnish layer onto the area that does not need to be transferred for the first time; when the white ink is a non-sticky ink, the barrier varnish layer may not be printed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed; Step A71: In the first powder spraying area, the powder spraying device applies the powder layer onto the incompletely cured white ink layer and / or the transfer varnish layer; Step A72: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step A73: In the second printing area, the color ink printhead prints a color pattern onto the substrate, and the first varnish printhead prints a first protective varnish layer onto the color pattern. Step A74: In the second powder spraying area, the powder spraying device applies the powder layer onto the colored pattern and / or the first protective varnish layer; Step A75: The substrate is cured by the curing device in the second curing zone, and then excess powder is removed; Step A76: In the first transfer area, the transfer device transfers the transfer film onto the substrate; Step A77: In the third printing area, the first varnish nozzle prints a second protective varnish layer on the surface of the substrate; Step A78: The substrate is cured by the curing device in the third curing zone.

9. The digital powder transfer 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 curing area, a first transfer area, a third printing area, and a third curing area along the flow direction of the substrate; including the following processing steps: Step A80: In the first printing area, the white ink printhead prints a white ink layer onto the substrate, and the first varnish printhead prints a first transfer varnish layer onto the area in the white ink layer area that needs to be transferred for the first time, and the first varnish printhead prints a barrier varnish layer onto the area that does not need to be transferred for the first time; when the white ink is a non-sticky ink, the barrier varnish layer may not be printed. The white ink printhead and the first varnish printhead can be superimposed and printed multiple times as needed; Step A81: In the first powder spraying area, the powder spraying device applies the powder layer to the incompletely cured white ink layer and / or the first transfer varnish layer and / or the barrier varnish layer. Step A82: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step A83: In the second printing area, the color ink printhead prints a color pattern onto the substrate, and the first varnish printhead prints a second transfer varnish layer onto the color pattern. Step A84: The substrate is cured by the curing device in the second curing zone; Step A85: In the first transfer area, the transfer device transfers the transfer film onto the substrate; Step A86: In the third printing area, the first varnish nozzle prints a protective varnish layer on the surface of the substrate; Step A87: The substrate is cured by the curing device in the third curing zone.

10. The digital powder transfer 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 first transfer area, a second printing area, and a second curing area along the flow direction of the substrate; including the following processing steps: Step A90: In the first printing area, the white ink printhead and the color ink printhead respectively print a white ink layer and a color pattern onto the substrate. The first varnish printhead prints a transfer varnish layer on the area of ​​the color pattern that needs to undergo the first transfer. The first varnish printhead prints a barrier varnish layer on the area that does not need to undergo the first transfer. When the ink printed by the white ink printhead and the color ink printhead is a non-viscous ink, the barrier varnish layer may not be printed. The first varnish printhead may perform multiple overlapping prints as needed. Step A91: In the first powder spraying area, the powder spraying device applies the powder layer onto the colored pattern and / or the transfer varnish layer; Step A92: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step A93: In the first transfer area, the transfer device transfers the transfer film onto the substrate; Step A94: In the second printing area, the first varnish nozzle prints a protective varnish layer on the surface of the substrate; Step A95: The substrate is cured by the curing device in the second curing zone.

11. The digital powder transfer printing method as described in claim 1, characterized in that, The substrate is a transparent substrate; the conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a first transfer area, a second printing area, a second powder spraying area, a second curing area, a second transfer area, a third printing area, and a third curing area along the flow direction of the substrate; including the following processing steps: Step B10: In the first printing area, the first varnish nozzle sprays a transfer varnish layer on the area of ​​the substrate where the first transfer is required, and the first varnish nozzle sprays a barrier varnish layer on the area where the first transfer is not required, or only sprays a transfer varnish layer on the area where the transfer is required; the transfer varnish layer can be printed multiple times as needed. Step B11: In the first powder spraying area, the powder spraying device applies the powder layer to the incompletely cured transfer varnish layer; Step B12: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step B13: In the first transfer area, the transfer device transfers the first transfer film onto the substrate; Step B14: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate; Step B15: In the second powder spraying area, the powder spraying device applies the powder layer onto the colored pattern and / or the transfer varnish layer; Step B16: The substrate is cured by the curing device in the second curing zone, and then excess powder is removed; Step B17: In the second transfer area, the transfer device transfers the second transfer film onto the substrate again; Step B18: In the third printing area, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the colored pattern. Step B19: The substrate is cured by the curing device in the third curing zone.

12. The digital powder transfer printing method as described in claim 1, characterized in that, The substrate is transparent; the conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a first transfer 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 flow direction of the substrate; including the following processing steps: Step B20: In the first printing area, the first varnish nozzle sprays a transfer varnish layer on the area of ​​the substrate where the first transfer is required, and the first varnish nozzle sprays a barrier varnish layer on the area where the first transfer is not required, or only sprays a transfer varnish layer on the area where the transfer is required; the transfer varnish layer and / or the barrier varnish layer can be sprayed multiple times as needed. Step B21: In the first powder spraying area, the powder spraying device applies the powder layer to the incompletely cured transfer varnish layer; Step B22: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step B23: In the first transfer area, the transfer device transfers the transfer film onto the substrate; Step B24: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate; Step B25: In the second powder spraying area, the powder spraying device applies the powder layer onto the colored pattern; Step B26: The substrate is cured by the curing device in the second curing zone, and then excess powder is removed; Step B27: In the third printing area, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the colored pattern. Step B28: The substrate is cured by the curing device in the third curing zone.

13. The digital powder transfer printing method as described in claim 1, characterized in that, The substrate is a transparent substrate; the conveying channel is sequentially provided with a first printing area, a first powder spraying area, a first curing area, a first transfer area, a second printing area, a second curing area, a second transfer area, a third printing area, and a third curing area along the flow direction of the substrate; including the following processing steps: Step B30: In the first printing area, the first varnish nozzle sprays a transfer varnish layer on the area of ​​the substrate where the first transfer is required, and the first varnish nozzle sprays a barrier varnish layer on the area where the first transfer is not required, or only sprays a transfer varnish layer on the area where the transfer is required; the transfer varnish layer and / or the barrier varnish layer can be sprayed multiple times as needed. Step B31: In the first powder spraying area, the powder spraying device applies the powder layer to the incompletely cured transfer varnish layer; Step B32: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step B33: In the first transfer area, the transfer device transfers the first transfer film onto the substrate; Step B34: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate; Step B35: The substrate is cured by the curing device in the second curing zone; Step B36: In the second transfer area, the transfer device transfers the second transfer film onto the substrate; Step B37: In the third printing area, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the colored pattern. Step B38: The substrate is cured by the curing device in the third curing zone.

14. The digital powder transfer printing method as described in claim 1, characterized in that, The substrate is transparent; 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 curing area, a first transfer area, a third printing area, and a third curing area along the flow direction of the substrate; the process includes the following steps: Step B40: In the first printing area, the first varnish printhead sprays a transfer varnish layer on the area of ​​the substrate where the first transfer is required, and the first varnish printhead sprays a barrier varnish layer on the area where the first transfer is not required, or only sprays a transfer varnish layer on the area where the transfer is required; the transfer varnish layer and / or the barrier varnish layer can be printed in multiple layers as needed. Step B41: In the first powder spraying zone, the powder spraying device applies the powder layer onto the incompletely cured transfer varnish layer; Step B42: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step B43: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate; the first varnish printhead sprays a transfer varnish layer on the area where the first transfer is required, and sprays a barrier varnish layer or does not spray a barrier varnish layer on the area where the first transfer is not required. Step B44: The substrate is cured by the curing device in the second curing zone; Step B45: In the first transfer zone, the transfer device transfers the transfer film onto the substrate; Step B46: In the third printing area, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the colored pattern. Step B47: The substrate is cured by the curing device in the third curing zone.

15. The digital powder transfer printing method as described in claim 1, characterized in that, The substrate is transparent; the conveying channel is sequentially provided with a first printing area, a first curing area, a first transfer area, a second printing area, a first powder spraying area, a second curing area, a third printing area, and a third curing area along the flow direction of the substrate; including the following processing steps: Step B50: In the first printing area, the first varnish nozzle sprays a transfer varnish layer on the area of ​​the substrate where the first transfer is required, and the first varnish nozzle sprays a barrier varnish layer on the area where the first transfer is not required, or only sprays a transfer varnish layer on the area where the transfer is required; the transfer varnish layer and / or the barrier varnish layer can be sprayed multiple times as needed. Step B51: The substrate is cured by the curing device in the first curing zone; Step B52: In the first transfer zone, the transfer device transfers the transfer film onto the substrate; Step B53: In the second printing area, the color ink printhead prints a mirrored color pattern onto the substrate; Step B54: In the first powder spraying area, the powder spraying device applies the powder layer onto the colored pattern; Step B55: The substrate is cured by the curing device in the second curing zone, and then excess powder is removed; Step B56: In the third printing area, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the colored pattern. Step B57: The substrate is cured by the curing device in the third curing zone.

16. The digital powder transfer printing method as described in claim 1, characterized in that, The substrate is a transparent substrate; the conveying channel is provided with a first printing area, a first powder spraying area, a first curing area, a first transfer area, a second printing area, and a second curing area sequentially along the flow direction of the substrate; the process includes the following steps: Step B60: In the first printing area, the color ink printhead prints a mirrored color pattern onto the substrate. The first varnish printhead applies a transfer varnish layer to the area of ​​the color pattern that needs to undergo the first transfer. The first varnish printhead also applies a barrier varnish layer to the area that does not need to undergo the first transfer, or applies a transfer varnish layer only to the area that needs to be transferred. The transfer varnish layer and / or the barrier varnish layer can be applied multiple times as needed. Step B61: In the first powder spraying area, the powder spraying device applies the powder layer onto the colored pattern and / or the transfer varnish layer; Step B62: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step B63: In the first transfer zone, the transfer device transfers the transfer film onto the substrate; Step B64: In the second printing area, the white ink printhead prints a white ink layer as a white ink underlay on the back side of the colored pattern. Step B65: The substrate is cured by the curing device in the second curing zone.

17. The digital powder transfer printing method as described in claim 1, characterized in that, The substrate is a transparent substrate; the conveying channel is provided with a first printing area, a first powder spraying area, a first curing area, a first transfer area, a second printing area, and a second curing area sequentially along the flow direction of the substrate; the process includes the following steps: Step B70: In the first printing area, the first varnish printhead sprays a transfer varnish layer on the area of ​​the substrate where the first transfer is required, and the first varnish printhead sprays a barrier varnish layer on the area where the first transfer is not required, or only sprays a transfer varnish layer on the area where the first transfer is required; the transfer varnish layer and / or the barrier varnish layer can be printed in multiple layers as needed; Step B71: In the first powder spraying area, the powder spraying device applies the powder layer to the incompletely cured transfer varnish layer and / or the barrier varnish layer; Step B72: The substrate is cured by the curing device in the first curing zone, and then excess powder is removed; Step B73: In the first transfer zone, the transfer device transfers the transfer film onto the substrate; Step B74: 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 as a white ink underlay on the back side of the color pattern. Step B75: The substrate is cured by the curing device in the second curing zone.

18. The digital powder transfer printing method as described in claim 1, characterized in that, The substrate is a transparent substrate; the conveying channel is provided with a first printing area and a second printing area along the flow direction of the substrate; the first printing area and the second printing area are respectively located upstream of the curing device; the processing steps include the following: Step C1: In the first printing area, the inkjet head forms a first pattern on the substrate; Step C2: In the second printing area, the inkjet head forms a second pattern on the substrate.

19. A digital powder transfer 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 inkjet printing area, at least one transfer 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 device; the drive device is used to drive the conveyor belt to move along the conveying direction; Printing equipment; The printing device is used to print onto the substrate within the printing area; 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 prints on the substrate in the printing area to form a printing layer. A transfer device; the transfer device is used to lay a transfer film and transfer it onto the substrate in the transfer area; the transfer device and the transfer area correspond one-to-one; when the substrate reaches the transfer area, the transfer device transfers the transfer film onto the surface of the substrate; A powder spraying device; the powder spraying device is used to form a powder layer on the substrate within the powder spraying area; 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 within 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 the powder layer; A curing device; the curing device is used to cure the material printed by the printing 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.

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