An apparatus and method for optically variable printing of a roll-based substrate

Abstract

The application discloses a kind of light color photochromic printing device and printing method for reel base material, the device includes base material unwinding module, base material pretreatment module, printing module, fixed magnetic solidification module and base material winding module;Base material unwinding module is used to place reel base material;Base material pretreatment module is used to carry out polarity processing to reel base material;Printing module is used to print photochromic ink to reel base material;Fixed magnetic solidification module includes toothless magnetic positioning cylinder and radiation curing unit, toothless magnetic positioning cylinder includes fixed magnetic block, toothless cylinder and main shaft body, the outer surface of toothless cylinder is provided with a plurality of annular grooves on one side, and a plurality of annular grooves are provided with corresponding fixed magnetic block;Radiation curing unit is used to carry out radiation curing to photochromic ink layer, to form light color photochromic pattern layer, to obtain the printing finished product containing the light color photochromic pattern layer;Base material winding module is used to store printing finished product.This application can reduce the rejection rate of base material in light color photochromic printing, reduce labor cost.

Description

Technical Field

[0001] This invention belongs to the field of optical variable ink printing technology, specifically relating to an optical variable ink printing apparatus and printing method for roll substrates. Background Technology

[0002] Optical color-changing technology refers to a technique where optically variable magnetic inks are subjected to a specific magnetic field designed by the artist. This allows the magnetic pigment flakes in the ink components to orient at different angles in different areas, thereby creating a unique optical color-changing effect and a magnetically oriented pattern within the magnetic ink. Due to its excellent anti-counterfeiting effect, optical color-changing technology is widely used in fields such as tobacco and alcohol packaging and securities printing.

[0003] Currently, optically variable ink printing is done on a sheet-by-sheet basis after paper feeding. For example, patent publication number CN103192591B discloses a magnetic orientation cylinder and printing machine. This patent achieves optically variable single-sheet printing using a KBA screen printing machine and a domestically developed screen printing and letterpress printing combined banknote printing machine. Patent publication number CN 106142818A discloses a magnetic imaging gravure printing machine. This patent achieves optically variable single-sheet gravure printing through its magnetic printing mechanism, which includes an impression cylinder, a gravure cylinder that prints magnetic ink onto the paper in conjunction with the impression cylinder, and a magnetized cylinder (with magnetic modules embedded on its circumference) for generating a magnetic field to fix the magnetic ink on the paper. However, since each cylinder of this magnetic imaging gravure printing machine needs to be equipped with grippers to achieve accurate paper feeding, the grippers are prone to wear over time, resulting in misregistration, ghosting, creases, and damage to the printed matter.

[0004] In summary, under current technology, only sheet-fed printing can be used for printing optically variable inks. Sheet-fed printing has problems such as low printing efficiency, high waste due to overprinting, and high labor costs. Summary of the Invention

[0005] The first objective of this invention is to overcome the shortcomings of the prior art and provide a glossy color printing device for roll substrates. This device is ingeniously configured with a substrate unwinding module, a substrate pretreatment module, a printing module, a magnetic curing module, and a substrate rewinding module, so that glossy color printing can be carried out using roll paper feeding, thereby reducing the waste rate of substrate paper feeding and reducing the labor cost of printing.

[0006] The second objective of this invention is to provide a method for optically variable ink printing on roll substrates.

[0007] The first objective of this invention can be achieved by adopting the following technical solution:

[0008] An optical variable ink printing apparatus for roll substrates includes a substrate unwinding module, a substrate pretreatment module, a printing module, a magnetic curing module, and a substrate rewinding module arranged sequentially.

[0009] The substrate unwinding module is used to place and transport the roll substrate to the substrate pretreatment module;

[0010] The substrate pretreatment module includes a dust-removing roller and a polarity treatment unit. The dust-removing roller is used to remove dust from the roll substrate conveyed by the substrate unwinding module, and the polarity treatment unit is used to perform polarity treatment on the dust-removed roll substrate to obtain a pretreated roll substrate.

[0011] The printing module is used to print photochromic ink on one side surface of the pretreated roll substrate, and the photochromic ink forms an uncured photochromic ink layer on one side surface of the pretreated roll substrate, thereby obtaining a semi-finished product containing the uncured photochromic ink layer.

[0012] The fixed-magnetic curing module includes a toothless magnetic positioning roller and a radiation curing unit. The toothless magnetic positioning roller includes a fixed magnetic block, a toothless roller, and a main shaft. The toothless roller is sleeved in the middle of the main shaft. The outer surface of the toothless roller is smooth, and one side of the outer surface of the toothless roller is provided with multiple annular grooves. Each of the multiple annular grooves is provided with a corresponding fixed magnetic block, and the shape of the fixed magnetic block matches the annular groove. The main shaft of the toothless magnetic positioning roller includes a first connecting shaft, a central shaft, and a second connecting shaft. The first connecting shaft and the second connecting shaft are respectively fixedly connected to both sides of the central shaft, and the central axes of the first connecting shaft, the central shaft, and the second connecting shaft coincide. Cooling pipes are provided in the first connecting shaft, the central shaft, and the second connecting shaft. The toothless magnetic positioning roller is used to magnetize and position the uncured photochromic ink layer in the semi-finished product. The radiation curing unit is used to radiation cure the magnetized and positioned photochromic ink layer in the semi-finished product to form a glossy photochromic pattern layer, thereby obtaining a printed product containing the glossy photochromic pattern layer.

[0013] The substrate winding module is used to collect the printed product containing the optically variable pattern layer to obtain a roll of printed product.

[0014] Preferably, the main shaft of the toothless magnetic positioning roller includes a first connecting shaft, a central shaft, and a second connecting shaft. The first connecting shaft and the second connecting shaft are respectively fixedly connected to the left and right sides of the central shaft, and the central axes of the first connecting shaft, the central shaft, and the second connecting shaft coincide. Cooling pipes are provided inside the first connecting shaft, the central shaft, and the second connecting shaft.

[0015] Preferably, the system also includes multiple guide rollers and traction rollers, which are respectively arranged between the modules.

[0016] Preferably, the roll substrate to be printed is made of paper, film, paper-plastic composite material or metal material.

[0017] Preferably, the photochromic ink is a radiation-curable magnetic photochromic ink.

[0018] Preferably, the polarity processing unit is a double-sided corona treatment machine or a plasma flame treatment machine.

[0019] Preferably, a floating roller is provided between the toothless magnetic positioning roller and the substrate winding module.

[0020] Preferably, it also includes an optical mask and a curing module, wherein the optical mask and curing module are installed between the printing module and the fixed magnet curing module.

[0021] A method for optically variable ink printing on roll-to-roll substrates, employing the aforementioned optically variable ink printing apparatus for roll-to-roll substrates, includes the following steps:

[0022] S1. Polarize the surface of the roll substrate to be printed to obtain the pretreated roll substrate.

[0023] S2. Print photochromic ink on one side surface of the pretreated roll substrate, and form an uncured photochromic ink layer on one side surface of the pretreated substrate, thereby obtaining a semi-finished product containing the uncured photochromic ink layer.

[0024] S3. The toothless magnetic positioning roller is used to magnetize and position the uncured photochromic ink layer in the semi-finished product obtained in step S2. Then, the magnetized photochromic ink layer in the semi-finished product is radiated and cured by the radiation curing unit to form a photochromic pattern layer, thereby obtaining a printed product containing a photochromic pattern layer.

[0025] S4. Determine whether the printed product is single-sided or double-sided. If it is single-sided, take the printed product containing the color-changing pattern layer obtained in step S3 as the final printed product and roll it up. If it is double-sided, repeat steps S1-S3 to process the other unprocessed surface of the printed product containing the color-changing pattern layer obtained in step S3 and roll it up.

[0026] Preferably, before printing, the operator can adjust the parameter settings of the optically variable ink or the toothless magnetic positioning roller to adjust the effect of the optically variable pattern layer.

[0027] The present invention has the following advantages over the prior art:

[0028] 1. The glossy color printing device for roll substrates of the present invention, through the ingenious arrangement of the substrate unwinding module, substrate pretreatment module, printing module, fixed magnetization curing module, substrate rewinding module and substrate conveying module, enables the device to perform glossy color printing by roll paper feeding, thereby effectively improving the printing efficiency and production quality of glossy color printing.

[0029] 2. The optical variable ink printing device for roll substrates of the present invention can achieve a variety of optical feature effects in the final printed product by adding an optical mask and a curing module, thereby improving the anti-counterfeiting performance and applicability of the product.

[0030] 3. The glossy color-changing printing device for roll substrate of the present invention adopts roll printing. This setting can solve the problem of double or multiple sheet feeding failure, reduce the scrap rate, and reduce the labor intensity of workers and reduce the labor cost in the printing work because roll paper printing does not require paper stacking.

[0031] 4. The glossy color printing apparatus for roll substrates of the present invention, by setting up a substrate unwinding module, a printing module and a substrate rewinding module, realizes the transport of roll substrates with tension film within the apparatus. This setting makes the transport speed of roll substrates within the apparatus more stable and controllable, and also eliminates the need for toothless magnetic positioning rollers to be equipped with grippers, thereby improving the stability of glossy color printing. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the optical variable ink printing apparatus for roll substrates according to the present invention;

[0033] Figure 2 This is a schematic diagram of the overall structure of the toothless magnetic positioning roller described in this invention;

[0034] Figure 3 This is a cross-sectional schematic diagram of the overall structure of the toothless magnetic positioning roller described in this invention;

[0035] Figure 4 This is a schematic diagram of the overall structure of the glossy color printing apparatus for roll substrates provided in Embodiment 2 of the present invention;

[0036] Figure 5 This is a logic diagram of the method for optically variable ink printing on roll substrates provided in Embodiment 3 of the present invention;

[0037] Among them, 1 is the substrate unwinding module, 2 is the substrate pretreatment module, 3 is the printing module, 4 is the fixed magnetic curing module, 401 is the toothless magnetic positioning roller, 402 is the radiation curing unit, 4011 is the first connecting shaft, 4012 is the central shaft, 4013 is the second connecting shaft, 4014 is the toothless roller, 4015 is the groove, 4016 is the cooling pipe, 5 is the substrate winding module, 6 is the dust-adhesive roller, 7 is the guide roller, 8 is the traction roller, 9 is the floating roller, and 10 is the optical mask and curing module. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., 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 this 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 this invention.

[0041] Example 1

[0042] like Figures 1-3 As shown, a photochromic printing device for roll substrates includes a substrate unwinding module 1, a substrate pretreatment module 2, a printing module 3, a magnetic curing module 4, and a substrate winding module 5 arranged sequentially.

[0043] The substrate unwinding module 1 is used to place and transport the roll substrate to the substrate pretreatment module 2;

[0044] Specifically, the roll-type substrate is made of paper, film, paper-plastic composite material or metal material.

[0045] The substrate pretreatment module 2 includes a dust-removing roller 6 and a polarity treatment unit. The dust-removing roller 6 is used to remove dust from the roll substrate conveyed by the substrate unwinding module 1, and the polarity treatment unit is used to perform polarity treatment on the dust-removed roll substrate to obtain a pretreated roll substrate.

[0046] Specifically, the purpose of setting up the dust-removing roller 6 is to reliably remove dust and debris from the surface of the substrate, preventing dust or debris from affecting subsequent printing on the roll substrate, thereby improving the color accuracy and quality of the final printed product.

[0047] In this embodiment, the polarity treatment unit uses a double-sided corona treatment machine to perform polarity treatment on the roll substrate.

[0048] The printing module 3 is used to print photochromic ink on one side surface of the pretreated roll substrate. The photochromic ink forms an uncured photochromic ink layer on one side surface of the pretreated roll substrate, thereby obtaining a semi-finished product containing the uncured photochromic ink layer.

[0049] In this embodiment, the printing module 3 uses a rotary gravure printing method to ink the substrate to be printed. This setting makes the ink layer on the surface of the substrate thicker and the color more vibrant, thereby making the glossy pattern layer of the final printed product richer in pattern types and more refined in text and images. In addition, it can also improve the printing speed of the glossy printing device for roll substrates.

[0050] Specifically, the photochromic ink is a radiation-cured magnetic photochromic ink, and the radiation-cured magnetic photochromic ink is a UV or LED-dried magnetic photochromic ink.

[0051] The fixed magnetic curing module 4 includes a toothless magnetic positioning roller 401 and a radiation curing unit 402. The toothless magnetic positioning roller 401 includes a fixed magnetic block, a toothless roller 4014, and a main shaft. The toothless roller 4014 is sleeved in the middle of the main shaft. The outer surface of the toothless roller 4014 is smooth. One side of the outer surface of the toothless roller 4014 is provided with a plurality of annular grooves 4015. Each of the plurality of annular grooves 4015 is provided with a corresponding fixed magnetic block. The shape of the fixed magnetic block matches the annular groove 4015. The toothless magnetic positioning roller 401 is used to magnetize and position the uncured photochromic ink layer in the semi-finished product. The radiation curing unit 402 is used to radiation cure the magnetized and positioned photochromic ink layer in the semi-finished product to form a glossy photochromic pattern layer, thereby obtaining a printed product containing the glossy photochromic pattern layer.

[0052] Specifically, such as Figure 2 and Figure 3As shown, the main shaft of the toothless magnetic positioning roller 401 includes a first connecting shaft 4011, a central shaft 4012, and a second connecting shaft 4013. The first connecting shaft 4011 and the second connecting shaft 4013 are respectively fixedly connected to the left and right sides of the central shaft 4012, and the central axes of the first connecting shaft 4011, the central shaft 4012, and the second connecting shaft 4013 coincide. Cooling pipes 4016 are provided in the first connecting shaft 4011, the central shaft 4012, and the second connecting shaft 4013. This arrangement facilitates the use of cooling water to cool the toothless magnetic positioning roller 401 when the device is put into operation, thereby preventing the toothless magnetic positioning roller 401 from being damaged (demagnetized) due to excessive temperature or causing shrinkage, deformation, and breakage of heat-sensitive materials such as films, thereby improving the durability of the glossy color-changing printing device for roll substrates.

[0053] The substrate winding module 5 is used to collect the printed product containing the optically variable pattern layer to obtain a roll of printed product.

[0054] The optical variable ink printing apparatus for roll substrates also includes multiple guide rollers 7 and traction rollers 8, which are respectively arranged between each module. This arrangement facilitates the transfer and movement of the roll substrate between the modules.

[0055] Specifically, a floating roller 9 is provided between the toothless magnetic positioning roller 401 and the substrate winding module 5. This arrangement facilitates the adjustment of the tension of the substrate on the roll, thereby making the transmission of the substrate on the roll smoother inside the device and improving the overall efficiency of the device.

[0056] Example 2

[0057] like Figure 4 As shown, a photochromic printing device for roll substrates includes a substrate unwinding module 1, a substrate pretreatment module 2, a printing module 3, an optical mask and curing module 10, a magnetic curing module 4, and a substrate winding module 5 arranged sequentially.

[0058] The substrate unwinding module 1 is used to place and transport the roll substrate to the substrate pretreatment module 2;

[0059] Specifically, the roll-type substrate is made of paper, film, paper-plastic composite material or metal material.

[0060] The substrate pretreatment module 2 includes a dust-removing roller 6 and a polarity treatment unit. The dust-removing roller 6 is used to remove dust from the roll substrate conveyed by the substrate unwinding module 1, and the polarity treatment unit is used to perform polarity treatment on the dust-removed roll substrate to obtain a pretreated roll substrate.

[0061] Specifically, the purpose of setting up the dust-removing roller 6 is to reliably remove dust and debris from the surface of the substrate, preventing dust or debris from affecting subsequent printing on the roll substrate, thereby improving the color accuracy and quality of the final printed product.

[0062] In this embodiment, the polarity treatment unit uses a double-sided corona treatment machine to perform polarity treatment on the roll substrate.

[0063] The printing module 3 is used to print photochromic ink on one side surface of the pretreated roll substrate. The photochromic ink forms an uncured photochromic ink layer on one side surface of the pretreated roll substrate, thereby obtaining a semi-finished product containing the uncured photochromic ink layer.

[0064] In this embodiment, the printing module 3 uses a rotary gravure printing method to ink the substrate to be printed. This setting makes the ink layer on the surface of the substrate thicker and the color more vibrant, thereby making the final printed product have a richer variety of patterns and more detailed graphics. In addition, it can also improve the printing speed of the glossy color-changing printing device for roll substrates.

[0065] Specifically, the photochromic ink is a radiation-cured magnetic photochromic ink, and the radiation-cured magnetic photochromic ink is a UV or LED-dried magnetic photochromic ink.

[0066] The optical mask and curing module 10 is used to apply local optical effects to the surface of the roll substrate, so that the printed product containing the iridescent pattern layer can present more iridescent effects.

[0067] The fixed magnetic curing module 4 includes a toothless magnetic positioning roller 401 and a radiation curing unit 402. The toothless magnetic positioning roller 401 includes a fixed magnetic block, a toothless roller 4014, and a main shaft. The toothless roller 4014 is sleeved in the middle of the main shaft. The outer surface of the toothless roller 4014 is smooth. One side of the outer surface of the toothless roller 4014 is provided with a plurality of annular grooves 4015. Each of the plurality of annular grooves 4015 is provided with a corresponding fixed magnetic block. The shape of the fixed magnetic block matches the annular groove 4015. The toothless magnetic positioning roller 401 is used to magnetize and position the uncured photochromic ink layer in the semi-finished product. The radiation curing unit 402 is used to radiation cure the magnetized and positioned photochromic ink layer in the semi-finished product to form a photochromic pattern layer, thereby obtaining a printed product containing the photochromic pattern layer.

[0068] Specifically, such as Figure 2 and Figure 3As shown, the main shaft of the toothless magnetic positioning roller 401 includes a first connecting shaft 4011, a central shaft 4012, and a second connecting shaft 4013. The first connecting shaft 4011 and the second connecting shaft 4013 are respectively fixedly connected to the left and right sides of the central shaft 4012, and the central axes of the first connecting shaft 4011, the central shaft 4012, and the second connecting shaft 4013 coincide. Cooling pipes 4016 are provided in the first connecting shaft 4011, the central shaft 4012, and the second connecting shaft 4013. This arrangement facilitates the use of cooling water to cool the toothless magnetic positioning roller 401 when the device is put into operation, thereby preventing the toothless magnetic positioning roller 401 from being damaged (demagnetized) due to excessive temperature or causing shrinkage, deformation, and breakage of heat-sensitive materials such as films, thereby improving the durability of the glossy color-changing printing device for roll substrates.

[0069] The substrate winding module 5 is used to collect the printed product containing the optically variable pattern layer to obtain a roll of printed product.

[0070] The optical variable ink printing apparatus for roll substrates also includes multiple guide rollers 7 and traction rollers 8, which are respectively arranged between each module. This arrangement facilitates the transfer and movement of the roll substrate between the modules.

[0071] Specifically, a floating roller 9 is provided between the toothless magnetic positioning roller 401 and the substrate winding module 5. This arrangement facilitates the adjustment of the tension of the substrate on the roll, thereby making the transmission of the substrate on the roll smoother inside the device and improving the overall efficiency of the device.

[0072] Example 3

[0073] like Figure 5 As shown, a method for optical variable ink printing on roll-to-roll substrates, employing the optical variable ink printing apparatus for roll-to-roll substrates as described in Example 1, includes the following steps:

[0074] S1. Polarize the surface of the roll substrate to be printed to obtain the pretreated roll substrate.

[0075] S2. Print photochromic ink on one side surface of the pretreated roll substrate, and form an uncured photochromic ink layer on one side surface of the pretreated substrate, thereby obtaining a semi-finished product containing the uncured photochromic ink layer.

[0076] S3. The toothless magnetic positioning roller 401 is used to magnetize and position the uncured photochromic ink layer in the semi-finished product obtained in step S2. Then, the photochromic ink layer after magnetization and positioning in the semi-finished product is radiated and cured by the radiation curing unit 402 to form a photochromic pattern layer, thereby obtaining a printed finished product containing a photochromic pattern layer.

[0077] S4. Determine whether the printed product is single-sided or double-sided. If it is single-sided, take the printed product containing the color-changing pattern layer obtained in step S3 as the final printed product and roll it up. If it is double-sided, repeat steps S1-S3 to process the other unprocessed surface of the printed product containing the color-changing pattern layer obtained in step S3 and roll it up.

[0078] Specifically, before printing, the staff can adjust the parameter settings of the optically variable ink or the toothless magnetic positioning roller 401 to adjust the effect of the optically variable pattern layer.

[0079] In the description of this invention, it should be noted that, unless otherwise explicitly specified and agreed, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0080] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. An apparatus for optically variable ink printing on roll substrates, characterized in that, It includes a substrate unwinding module, a substrate pretreatment module, a printing module, a magnetic curing module, and a substrate winding module arranged sequentially. The substrate unwinding module is used to place and transport the roll substrate to the substrate pretreatment module; The substrate pretreatment module includes a dust-removing roller and a polarity treatment unit. The dust-removing roller is used to remove dust from the roll substrate conveyed by the substrate unwinding module, and the polarity treatment unit is used to perform polarity treatment on the dust-removed roll substrate to obtain a pretreated roll substrate. The printing module is used to print photochromic ink on one side surface of the pretreated roll substrate, and the photochromic ink forms an uncured photochromic ink layer on one side surface of the pretreated roll substrate, thereby obtaining a semi-finished product containing the uncured photochromic ink layer. The fixed-magnetic curing module includes a toothless magnetic positioning roller and a radiation curing unit. The toothless magnetic positioning roller includes a fixed magnetic block, a toothless roller, and a main shaft. The toothless roller is sleeved in the middle of the main shaft. The outer surface of the toothless roller is smooth, and one side of the outer surface of the toothless roller is provided with multiple annular grooves. Each of the multiple annular grooves is provided with a corresponding fixed magnetic block, and the shape of the fixed magnetic block matches the annular groove. The main shaft of the toothless magnetic positioning roller includes a first connecting shaft, a central shaft, and a second connecting shaft. The first connecting shaft and the second connecting shaft are respectively fixedly connected to both sides of the central shaft, and the central axes of the first connecting shaft, the central shaft, and the second connecting shaft coincide. Cooling pipes are provided in the first connecting shaft, the central shaft, and the second connecting shaft. The toothless magnetic positioning roller is used to magnetize and position the uncured photochromic ink layer in the semi-finished product. The radiation curing unit is used to radiation cure the magnetized and positioned photochromic ink layer in the semi-finished product to form a glossy photochromic pattern layer, thereby obtaining a printed product containing the glossy photochromic pattern layer. The substrate winding module is used to collect the printed product containing the optically variable pattern layer to obtain a roll of printed product.

2. The glossy variable ink printing apparatus for roll substrates according to claim 1, characterized in that, It also includes multiple guide rollers and traction rollers, which are respectively arranged between each module.

3. The glossy variable ink printing apparatus for roll substrates according to claim 1, characterized in that, The roll substrate to be printed is made of paper, film, paper-plastic composite material or metal material.

4. The glossy variable ink printing apparatus for roll substrates according to claim 1, characterized in that, The photochromic ink is a radiation-cured magnetic photochromic ink.

5. The glossy variable ink printing apparatus for roll substrates according to claim 1, characterized in that, The polarity processing unit employs a double-sided corona treatment machine or a plasma flame treatment machine.

6. The glossy variable ink printing apparatus for roll substrates according to claim 1, characterized in that, A floating roller is provided between the toothless magnetic positioning roller and the substrate winding module.

7. The glossy variable ink printing apparatus for roll-to-roll substrates according to any one of claims 1-6, characterized in that, It also includes an optical mask and a curing module, which are installed between the printing module and the fixed magnet curing module.

8. A method for optically variable ink printing on roll-to-roll substrates, characterized in that, The optical variable ink printing apparatus for roll substrates as described in any one of claims 1-6 includes the following steps: S1. Polarize the surface of the roll substrate to be printed to obtain the pretreated roll substrate. S2. Print photochromic ink on one side surface of the pretreated roll substrate, and form an uncured photochromic ink layer on one side surface of the pretreated substrate, thereby obtaining a semi-finished product containing the uncured photochromic ink layer. S3. The toothless magnetic positioning roller is used to magnetize and position the uncured photochromic ink layer in the semi-finished product obtained in step S2. Then, the magnetized photochromic ink layer in the semi-finished product is radiated and cured by the radiation curing unit to form a photochromic pattern layer, thereby obtaining a printed product containing a photochromic pattern layer. S4. Determine whether the printed product is single-sided or double-sided. If it is single-sided, take the printed product containing the color-changing pattern layer obtained in step S3 as the final printed product and roll it up. If it is double-sided, repeat steps S1-S3 to process the other unprocessed surface of the printed product containing the color-changing pattern layer obtained in step S3 and roll it up.

9. The method for optical variable ink printing on roll substrates according to claim 8, characterized in that, Before printing, staff can adjust the parameter settings of the optically variable ink or the toothless magnetic positioning roller to adjust the effect of the optically variable pattern layer.

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