Multi-color light-variable printing equipment

Abstract

The invention provides multi-color light-variable printing equipment. The multi-color light-variable printing equipment comprises a conveying unit, a printing unit and a printing unit, the first printing unit is used for imprinting ink or a varnish carrier on a sheet-shaped base material through first printing to form a printing stock; the first magnetization and variable pre-curing unit is used for carrying out magnetization positioning on the ink or varnish carrier on the printing stock and carrying out pre-drying curing so as to form a variable optically variable mark; a second magnetization and pre-curing unit; the second printing unit is used for imprinting the ink or varnish carrier on the sheet-shaped base material through second printing so as to form a variable anti-counterfeiting mark associated with the variable optically variable mark; and a drying and curing unit. According to the method, the multi-color light change technology with variable information is associated with the personalized feature information on the printing stock to form a one-to-one corresponding verification mechanism, so that the counterfeiting difficulty is greatly improved, and the anti-counterfeiting performance, the reliability and the safety are enhanced.

Description

Technical Field

[0001] The present application relates to the field of anti-counterfeiting printing technology, and in particular to a multi-color optically variable printing device. Background Art

[0002] Currently, printing equipment around the world can achieve single or multiple, fixed or variable effect optical variable technology for the same screen-printed image and text. All of these technologies are only presented as independent anti-counterfeiting features on the printed material, and are not combined with other personalized feature information such as graphics, text, numbers, serial numbers, QR codes, barcodes, etc. on the printed material. Summary of the Invention

[0003] This application aims to solve or improve the above technical problems.

[0004] To this end, the purpose of this application is to provide a multi-color optically variable printing device.

[0005] To achieve the purpose of this application, the technical solution of the present invention provides a multi-color optically variable printing device, including: a conveying unit for conveying a sheet substrate; a first printing unit for imprinting an ink or varnish carrier on the sheet substrate by a first printing to form a printed material; a first magnetization and variable pre-curing unit for magnetizing and positioning the ink or varnish carrier on the printed material, and accurately and selectively pre-curing the magnetized part of the ink or varnish carrier to form a variable optically variable mark; a second magnetization and pre-curing unit for magnetizing and positioning the ink or varnish carrier on the printed material that has not been pre-dried and cured, and pre-drying and curing the remaining part of the magnetized ink or varnish carrier a second printing unit for printing ink or varnish carrier on the sheet substrate through a second printing to form a variable anti-counterfeiting mark associated with the variable optically variable mark; a drying and curing unit for drying and curing the substrate; wherein the conveying unit, the first printing unit, the first magnetization and variable pre-curing unit, the second magnetization and pre-curing unit, the second printing unit, and the drying and curing unit are arranged in sequence in the conveying direction of the substrate, or the conveying unit, the first printing unit, the first magnetization and variable pre-curing unit, the second magnetization and pre-curing unit, the drying and curing unit, and the second printing unit are arranged in sequence in the conveying direction of the substrate.

[0006] In this technical solution, the multi-color optically variable printing device includes a conveying unit, a first printing unit, a first magnetization and variable pre-curing unit, a second magnetization and pre-curing unit, a second printing unit, and a drying and curing unit. The conveying unit is used to convey a sheet-like substrate. The first printing unit is used to imprint an ink or varnish carrier on a sheet-like substrate by a first printing to form a printed material. The first magnetization and variable pre-curing unit is used to magnetize and position the ink or varnish carrier on the printed material, and to accurately and selectively pre-cure the magnetized portion of the ink or varnish carrier to form a variable optically variable mark. The second magnetization and pre-curing unit is used to magnetize and position the ink or varnish carrier on the printed material that has not been pre-dried and cured, and to pre-dry and cure the remaining magnetized portion of the ink or varnish carrier. The second printing unit is used to imprint an ink or varnish carrier on a sheet-like substrate by a second printing to form a variable anti-counterfeiting mark associated with the variable optically variable mark. The drying and curing unit is used to dry and cure the printed material. By associating the variable light-variable mark with the variable anti-counterfeiting mark, a one-to-one verification mechanism is formed, forming a more integrated composite anti-counterfeiting method, which can greatly increase the difficulty of counterfeiting and enhance the anti-counterfeiting performance, reliability and security.

[0007] In addition, the technical solution provided by this application may also have the following additional technical features:

[0008] In the above technical solution, the multi-color optically variable printing device also includes: an online detection unit, which is used to online detect the printing quality of the substrate and verify the accuracy of the association between the variable optically variable mark and the variable anti-counterfeiting mark; wherein, in the conveying direction of the substrate, the online detection unit is arranged after the drying and curing unit and after the second printing unit.

[0009] In the above technical solution, the multi-color optically variable printing device also includes: a paper collection unit, which is used to sort, inspect and collect the printing materials.

[0010] In the above technical solution, the multi-color optically variable printing device further includes: a plurality of transfer rollers for conveying the printing substrate.

[0011] In the above technical solution, the first printing method includes one of the following: circle pressing into circle, circle pressing into flat, or flat pressing into flat; and / or the second printing method includes one of the following: circle pressing into circle, circle pressing into flat, or flat pressing into flat; and / or the drying and curing method includes one of the following: circle pressing into circle, circle pressing into flat, or flat pressing into flat.

[0012] In the above technical solution, the first magnetization and variable pre-curing unit includes a first magnetization roller and a pre-drying and curing device, and the first magnetization roller and the pre-drying and curing device are arranged opposite to each other.

[0013] In the above technical solution, the pre-drying and curing device includes an optical mask unit, which is used to emit a variable light field.

[0014] In the above technical solution, the second magnetization and pre-curing unit includes a second magnetization roller and a pre-drying and curing mechanism, and the second magnetization roller and the pre-drying and curing mechanism are arranged opposite to each other.

[0015] In the above technical solution, the second printing includes mechanical printing or electronically controlled printing.

[0016] In the above technical solution, the variable light-changing mark includes one of the following or a combination thereof: graphics, text, numbers, serial numbers, QR codes, and bar codes.

[0017] In the above technical solution, the variable anti-counterfeiting mark includes one of the following or a combination thereof: graphics, text, numbers, serial numbers, QR codes, and bar codes.

[0018] In the above technical solution, the multi-color optically variable printing equipment can realize a multi-color optically variable technology with multiple dynamic optically variable splicing or interlaced visual effects, micron-level image and text fineness, and one or a combination of variable information anti-counterfeiting features on the same printed image.

[0019] Additional aspects and advantages of the present application will become apparent in the following description or may be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic structural diagram of a multi-color optically variable printing device according to an embodiment of the present application;

[0022] Figure 2 This is a structural schematic diagram of a multi-color optically variable printing device according to another embodiment of the present application.

[0023] in, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and component names is as follows:

[0024] 10 multi-color optically variable printing equipment, 110 conveying unit, 120 first printing unit, 130 first magnetizing roller, 140 pre-drying and curing device, 150 second magnetizing roller, 160 pre-drying and curing mechanism, 170 second printing unit, 180 drying and curing unit, 190 online detection unit, 200 paper collection unit, 210 transfer roller; 220: first magnetization and variable pre-curing unit; 230: second magnetization and pre-curing unit. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0027] Refer to the following Figure 1 and Figure 2 The multi-color optically variable printing device according to some embodiments of the present application is described.

[0028] According to an embodiment of the present application, a multi-color optically variable printing device 10 is provided. Figure 1 As shown, it includes a conveying unit 110 , a first printing unit 120 , a first magnetizing and variable pre-curing unit 220 , a second magnetizing and pre-curing unit 230 , a second printing unit 170 and a drying and curing unit 180 .

[0029] The conveying unit 110 is used to convey the sheet-like substrate; the first printing unit 120 is used to print ink or varnish carrier on the sheet-like substrate through the first printing to form a printed material.

[0030] The primary magnetization and variable pre-curing unit 220 is used to magnetize and position the ink or varnish carrier on the substrate and then precisely and selectively pre-cures portions of the magnetized ink or varnish carrier to form a variable optically variable mark. A variable optically variable mark is one that is changeable. For example, by pre-curing different portions of the ink or varnish carrier, different optically variable marks can be formed.

[0031] The second magnetization and pre-curing unit 230 is used to magnetize and position the ink or varnish carrier on the substrate that has not been pre-dried and cured, and to pre-dry and cure the remaining magnetized ink or varnish carrier.

[0032] The second printing unit 170 is used to print ink or varnish carrier on the sheet substrate through a second printing process to form a variable anti-counterfeiting mark associated with the variable optically variable mark. The variable anti-counterfeiting mark means that the anti-counterfeiting mark is changeable.

[0033] The drying and curing unit 180 is used to dry and cure the substrate.

[0034] Among them, Figure 1In the embodiment, the conveying unit 110, the first printing unit 120, the first magnetization and variable pre-curing unit 220, the second magnetization and pre-curing unit 230, the second printing unit 170 and the drying and curing unit 180 are arranged in sequence in the conveying direction of the substrate, that is, in the conveying direction of the substrate, the drying and curing unit 180 is located after the second printing unit 170.

[0035] For example Figure 1 As shown, the multi-color optically variable printing device 10 according to an embodiment of the present application further includes an online detection unit 190. The online detection unit 190 is used to detect the printing quality of the substrate online and verify the accuracy of the association between the variable optically variable mark and the variable anti-counterfeiting mark; in the conveying direction of the substrate, the online detection unit 190 is arranged after the drying and curing unit 180. In other words, the drying and curing unit 180 is arranged between the second printing unit 170 and the online detection unit 190.

[0036] The association between the variable optically variable mark and the variable anti-counterfeiting mark is preset in the online detection unit 190. Therefore, the online detection unit 190 can perform verification based on the preset association. If the variable optically variable mark and the variable anti-counterfeiting mark do not conform to the preset association, the verification result is "failed". If they conform to the preset association, the verification result is "passed". For example, the preset association can be completely identical, partially identical, similar, or any other form of association.

[0037] Optionally, the variable light-variable mark includes one of the following or a combination thereof: graphics, text, numbers, serial numbers, QR codes, and bar codes.

[0038] Optionally, the variable anti-counterfeiting mark includes one of the following or a combination thereof: graphics, text, numbers, serial numbers, QR codes, and bar codes.

[0039] In this embodiment, the multi-color optically variable printing device 10 includes a conveying unit 110, a first printing unit 120, a first magnetization and variable pre-curing unit 220, a second magnetization and pre-curing unit 230, a second printing unit 170, a drying and curing unit 180, and an online detection unit 190. The conveying unit 110 is used to convey a sheet-like substrate. The first printing unit 120 is used to imprint an ink or varnish carrier on a sheet-like substrate by a first printing (such as screen printing) to form a printed material. The first magnetization and variable pre-curing unit 220 is used to magnetize and position the ink or varnish carrier on the printed material, and to accurately and selectively pre-cure the magnetized portion of the ink or varnish carrier to form a variable optically variable mark. The second magnetization and pre-curing unit 230 is used to magnetize and position the ink or varnish carrier on the printed material that has not been pre-dried and cured, and to pre-dry and cure the remaining magnetized portion of the ink or varnish carrier. The second printing unit 170 is used to imprint ink or varnish onto a sheet-like substrate through printing (e.g., letterpress printing) to form a variable anti-counterfeiting mark (e.g., a serial number) associated with the variable optically variable mark. The drying and curing unit 180 is used to dry and cure the printed material. The online inspection unit 190 is used to perform online inspection of the printed material's print quality and verify the accuracy of the association between the variable optically variable mark and the variable anti-counterfeiting mark. By associating the variable optically variable mark and the variable anti-counterfeiting mark, a one-to-one verification mechanism is established, creating a more integrated composite anti-counterfeiting solution that significantly increases the difficulty of counterfeiting and enhances anti-counterfeiting performance, reliability, and security.

[0040] exist Figure 1 In this embodiment, the placement of the drying and curing unit 180 after the second printing unit 170 and before the online inspection unit 190 not only eliminates any risks to the quality of optically variable image printing, but also enhances the bond strength between the ink printed by the first printing unit 120 and the paper. Specifically, because the present invention's solution provides simultaneous magnetization and pre-curing, the length of the post-magnetization curing path no longer affects the magnetization effect. Even if the curing path is extended due to the delayed placement of the drying and curing unit 180, this does not pose any risks to the quality of the optically variable image printing. Furthermore, the delayed placement of the drying and curing unit 180 prolongs the time it takes for the ink printed by the first printing unit 120 to penetrate the paper before it is fully cured, which helps enhance the bond strength between the ink and the paper.

[0041] In addition, Figure 1In this embodiment, by placing drying and curing unit 180 after second printing unit 170, fast-drying ink can be printed by second printing unit 170 before drying and curing. This adds a fast-drying ink printing process feature, enabling rapid drying and curing of the ink, effectively shortening product turnaround time and aligning with future ink development trends. For example, the fast-drying ink can be UV-curable ink, infrared-curable ink, or electron-beam-curable ink, and drying and curing unit 180 can be a UV-curing device, infrared-curing device, or electron-beam-curing device.

[0042] In addition, Figure 1 In this embodiment, by placing the drying and curing unit 180 after the second printing unit 170, the number of transfer rollers is reduced, and the number of paper handovers is reduced by two compared to existing equipment. This reduces paper feed failures and further reduces the risk of paper burning. Furthermore, by placing the drying and curing unit 180 after the second printing unit 170, the second printing unit 170 has more operating space for printing, making maintenance more convenient. The overall length and height of the multi-color optically variable printing device of the present invention are reduced compared to existing equipment, resulting in a smaller footprint.

[0043] In some embodiments, optionally, the multi-color optically variable printing device 10 further includes a paper collection unit 200 , which is used for sorting, spot-checking and collecting the substrates.

[0044] In some embodiments, optionally, the multi-color optically variable printing device 10 further includes a plurality of transfer rollers 210 , and the plurality of transfer rollers 210 are used to transport the printing material.

[0045] In some embodiments, optionally, the first printing method includes round-to-round, round-to-flatten, or flat-to-flatten. The second printing method includes round-to-round, round-to-flatten, or flat-to-flatten. The drying and curing method includes round-to-round, round-to-flatten, or flat-to-flatten.

[0046] In some embodiments, the first magnetization and variable pre-curing unit 220 optionally includes a first magnetization roller 130 and a pre-drying and curing device 140. The first magnetization roller 130 and the pre-drying and curing device 140 are arranged opposite each other to achieve the first magnetization and pre-curing functions. For example, the first magnetization roller 130 is provided with a magnetic orientation unit for magnetically orienting the substrate. The pre-drying and curing device 140 includes an optical mask unit for emitting a variable light field.

[0047] In some embodiments, optionally, the second magnetization and pre-curing unit 230 includes a second magnetization roller 150 and a pre-drying and curing mechanism 160 , which are arranged opposite to each other to achieve the second magnetization and pre-curing function.

[0048] In the embodiment of the present application, the structure and working principle of the first magnetization and variable pre-curing unit 220 and the second magnetization and pre-curing unit 230 can be the same as the structure and working principle of the first optically variable pattern forming unit and the second optically variable pattern forming unit in the PCT patent application with publication number WO2023284208A1, or other devices in the prior art that can form optically variable patterns can also be used. Therefore, their specific structure and working principle will not be repeated here.

[0049] In some embodiments, the second printing unit 170 can optionally employ mechanical or electronic printing. For example, electronically printing the prefix number can achieve both sequential and random number printing. Multi-color optically variable technology with variable information can also achieve both sequential and random number printing, enabling both regular sequential number printing and rapid original code printing. This addresses the labor-intensive nature of manual original code printing, low production efficiency, high risk of dialing errors, and difficulty ensuring product quality.

[0050] According to a specific embodiment of the present application, a multi-color optically variable printing device 10 is provided. Figure 1 As shown, the second printing unit 170 is arranged after the pre-drying and curing mechanism 160 and before the drying and curing unit 180, and is used to print a variable anti-counterfeiting mark (such as a serial number) associated with a variable image in the multi-color optically variable technology.

[0051] When the second printing unit 170 prints the serial number, the printing method may be:

[0052] 1. Mechanical number printing: the number machine is controlled by a mechanical structure, so the prefix number can only be printed in a fixed order of increment or decrement, which can realize the printing of consecutive prefix numbers.

[0053] 2. Electronically controlled number printing: the numbering machine is controlled by a computer program, so the prefix numbers can be printed in a fixed order, increasing, decreasing or randomly, and can realize the printing of consecutive numbers and random numbers.

[0054] Specifically, the method for using the multi-color optically variable printing device according to the embodiment of the present application may include the following steps:

[0055] Step 1: The sheet substrate is transported to the first printing unit 120 through the transport unit 110. The first printing unit 120 prints ink or varnish carrier on the sheet substrate to form a printed material through a first printing process.

[0056] Step 2: The printing substrate is conveyed to the first magnetizing roller 130 via the transfer roller 210. While the ink or varnish carrier on the printing substrate is magnetized and positioned by the first magnetizing roller 130, a pattern formed by a variable light field emitted by the optical mask unit of the pre-drying and curing device 140 disposed opposite the first magnetizing roller 130 can be used to precisely and selectively pre-cure a portion of the magnetized ink or varnish carrier, thereby forming a variable optically variable mark. For example, the variable optically variable mark formed in step 2 can be a specific printed image or text.

[0057] Step 3: The printing substrate is conveyed to the second magnetizing roller 150 via the transfer roller 210. The ink or varnish carrier on the printing substrate that has not been pre-dried and cured in step 2 is magnetized and positioned by the second magnetizing roller 150. Meanwhile, the remaining magnetized ink or varnish carrier is pre-dried and cured by the pre-drying and curing mechanism 160 disposed opposite to the second magnetizing roller 150.

[0058] Step 4: The substrate is conveyed via the transfer roller 210 to the second printing unit 170. The second printing unit 170 performs a second printing process to imprint an ink or varnish carrier onto the sheet substrate to form a variable anti-counterfeiting mark associated with the variable optically variable mark formed in step 2. For example, in step 4, a specific serial number associated with the specific printed image formed in step 2 may be formed.

[0059] Step 5: After the substrate has been printed for the first time, magnetized twice and pre-dried and cured, and printed for the second time, it is transported to the drying and curing unit 180 via the transfer roller 210 for drying and curing;

[0060] Step 6: The printing quality of the printed material is inspected by the online inspection unit 190, and the accuracy of the association between the variable anti-counterfeiting mark in step 2 and the variable anti-counterfeiting mark in step 4 is verified. For example, in step 6, it is verified whether the association between the specific printed image formed in step 2 and the specific serial number formed in step 4 conforms to the preset association. If so, the verification result is "passed", and if not, the verification result is "failed".

[0061] Step 7: The printing substrates are sorted, inspected and collected by the paper collection unit 200.

[0062] The first printing, the second printing and the drying and curing in this embodiment can be performed by a round-to-round, round-to-flat or flat-to-flat printing method.

[0063] The paper delivery in this embodiment can be carried out by means of grippers, belts or chains.

[0064] The magnetization and pre-drying and curing in this embodiment can be a single magnetization and pre-drying and curing (step 2, i.e., a single-effect optically variable technology), or can be a double magnetization and pre-drying and curing (steps 2 and 3), or can be more than two magnetization and pre-drying and curing.

[0065] Figure 2 This is a structural diagram of a multi-color optically variable printing device according to another embodiment of the present invention. Figure 1 The difference of the illustrated embodiment is that, in the conveying direction of the printing material, the drying and curing unit 180 is arranged before the second printing unit 170 , and the online detection unit 190 is arranged after the second printing unit 170 .

[0066] In summary, the beneficial effects of the embodiments of the present application are:

[0067] 1. The first magnetization and variable pre-curing unit 220, combined with the second printing unit 170, produces a variable optically variable mark and a variable anti-counterfeiting mark, respectively. Compared to single anti-counterfeiting features, the variable optically variable mark and the variable anti-counterfeiting mark are linked, forming a one-to-one verification mechanism. This creates a more integrated composite anti-counterfeiting method, significantly increasing the difficulty of counterfeiting and enhancing anti-counterfeiting performance, reliability, and security.

[0068] 2. When the second printing is electronically controlled, both sequential and random prefix printing are possible. Multi-color optical variable technology with variable information also enables corresponding sequential and random number printing, enabling both normal sequential number printing and rapid original number printing. This satisfies the public's demand for collecting and appreciating sequential number securities, while resolving the labor-intensive, low-efficiency, high-risk of dialing errors, and difficulty in ensuring product quality associated with manual original number printing.

[0069] 3. Placing the drying and curing unit 180 after the second printing unit 170 and before the in-line inspection unit 190 further enhances the bond between the ink printed by the first printing unit 120 and the paper. This solution eliminates any risks to the quality of optically variable printing. Because of the simultaneous magnetization and pre-curing function, the length of the post-magnetization curing path no longer affects the magnetization effect. Furthermore, placing the drying and curing unit 180 after the second printing unit 170 and before the in-line inspection unit 190 prolongs the time for the ink printed by the first printing unit 120 to penetrate the paper before it is fully cured, thereby enhancing the bond between the ink and the paper. Furthermore, placing the drying and curing unit 180 after the second printing unit 170 allows for quick-drying ink to be printed by the second printing unit 170 before drying and curing, thereby enhancing the fast-drying ink printing process and effectively shortening product turnaround time, in line with future ink development trends. Furthermore, placing the drying and curing unit 180 after the second printing unit 170 reduces the number of paper handovers, by two compared to existing equipment, which reduces paper feed failures and further mitigates the risk of paper burning. Furthermore, by arranging the drying and curing unit 180 after the second printing unit 170, the second printing unit 170 has a larger operating space for printing and is more convenient to maintain. The total length and height of the device of the present invention are reduced compared to existing devices, and the space occupied is small.

[0070] In this application, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art can understand the specific meanings of the above terms in this application based on the specific circumstances.

[0071] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0072] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0073] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A multi-color optically variable printing device, characterized in that: include: A conveying unit, used for conveying a sheet-like substrate; a first printing unit for imprinting an ink or varnish carrier on the sheet-like substrate by a first printing to form a printed material; A first magnetization and variable pre-curing unit is used to magnetize and position the ink or varnish carrier on the substrate, and to accurately and selectively pre-cure a portion of the magnetized ink or varnish carrier to form a variable optical mark; a second magnetization and pre-curing unit, for magnetizing and positioning the ink or varnish carrier on the substrate that has not been pre-dried and cured, and pre-drying and curing the remaining magnetized ink or varnish carrier; a second printing unit for printing ink or varnish carrier on the sheet-like substrate by a second printing process to form a variable anti-counterfeiting mark associated with the variable optically variable mark; A drying and curing unit, used for drying and curing the substrate; In which, the conveying unit, the first printing unit, the first magnetization and variable pre-curing unit, the second magnetization and pre-curing unit, the second printing unit, and the drying and curing unit are arranged in sequence in the conveying direction of the printing substrate, or the conveying unit, the first printing unit, the first magnetization and variable pre-curing unit, the second magnetization and pre-curing unit, the drying and curing unit, and the second printing unit are arranged in sequence in the conveying direction of the printing substrate.

2. The multi-color optically variable printing device according to claim 1, characterized in that: Also includes: An online detection unit, used for online detection of the printing quality of the substrate and verification of the accuracy of the association between the variable optically variable mark and the variable anti-counterfeiting mark; Wherein, in the conveying direction of the printing material, the online detection unit is arranged after the drying and curing unit and after the second printing unit.

3. The multi-color optically variable printing device according to claim 1, characterized in that: Also includes: A paper collection unit, used for sorting, sampling and collecting the printing substrates; and / or A plurality of transfer rollers are used for conveying the printing material.

4. The multi-color optically variable printing device according to claim 1, characterized in that: The first printing method includes one of the following: round-to-round, round-to-flat or flat-to-flat; and / or The second printing method includes one of the following: round-to-round, round-to-flat or flat-to-flat; and / or The drying and curing method includes one of the following: round pressing round, round pressing flat or flat pressing flat.

5. The multi-color optically variable printing device according to claim 1, characterized in that: The first magnetization and variable pre-curing unit includes a first magnetization roller and a pre-drying and curing device, and the first magnetization roller and the pre-drying and curing device are arranged opposite to each other.

6. The multi-color optically variable printing device according to claim 5, characterized in that: The pre-drying and curing device includes an optical mask unit.

7. The multi-color optically variable printing device according to claim 1, characterized in that: The second magnetization and pre-curing unit includes a second magnetization roller and a pre-drying and curing mechanism, and the second magnetization roller and the pre-drying and curing mechanism are arranged opposite to each other.

8. The multi-color optically variable printing device according to claim 1, characterized in that: The second printing includes mechanical printing or electronically controlled printing.

9. The multi-color optically variable printing device according to any one of claims 1 to 8, characterized in that: The variable light-changing mark includes one of the following or a combination thereof: graphics, text, numbers, serial numbers, QR codes, bar codes; and / or The variable anti-counterfeiting mark includes one of the following or a combination thereof: graphics, text, numbers, serial numbers, QR codes, and bar codes.

10. The multi-color optically variable printing device according to any one of claims 1 to 8, characterized in that: The multi-color optically variable printing device can realize a multi-color optically variable technology with a multi-dynamic optically variable splicing or interlacing visual effect, a micron-level image and text fineness, and one or a combination of variable information anti-counterfeiting features on the same printed image.

Images