Printing system and printing method for multi-view magnetic anti-counterfeiting image

Abstract

The invention relates to a printing system and a printing method of an anti-counterfeiting image, in particular to a printing system and a printing method of a multi-view magnetic anti-counterfeiting image, and solves the problems of smear, low printing speed and low color register precision when the magnetic anti-counterfeiting image is printed in the prior art. The system comprises a multicolor printing machine, a plurality of magnetic rollers and a plurality of magnetic orientation shaping devices. One or more magnetic rollers are arranged on the front face and / or the back face of the printing face of a printing stock between a printing roller and a printing discharging roller in each printing color group of the multicolor printing machine. The number of the magnetic orientation shaping devices is equal to that of the printing color cells, and the magnetic orientation shaping devices are arranged between the magnetic roller closest to the printing discharging roller in each printing color cell and the printing discharging roller in a one-to-one correspondence mode. Each magnetic orientation shaping device comprises an independent magnetic orientation device and an independent magnetic shaping device, and the magnetic orientation device and the magnetic shaping device are respectively positioned on opposite sides of the front side and the back side of the printing surface at the same position of the printing stock.

Description

Technical Field

[0001] The invention relates to a printing system and a printing method for anti-counterfeiting images, and in particular to a printing system and a printing method for multi-viewing angle magnetic anti-counterfeiting images. Background Art

[0002] The magnetic anti-counterfeiting image is an image with a three-dimensional effect obtained by magnetically orienting and magnetically shaping the ink coating containing magnetic pigments through magnetic field interference; since the magnetic field exists in three dimensions, the three-dimensional base point of the image can be used as an effective parameter point for anti-counterfeiting, and therefore, it is widely used in anti-counterfeiting products.

[0003] In the prior art, magnetic anti-counterfeiting image technology has been used in coating processes such as spraying and coating, as well as screen printing processes, for coating of film materials, printing of labels, etc. CN103962292A is an invention patent for a coating device and coating process for magnetic pigments, which discloses a magnetic orientation device, a magnetic shaping device, and an embodiment of using it together with a screen printer. However, it only discloses continuous magnetic orientation and magnetic shaping after the screen of the screen printer is flattened with ink containing magnetic pigments, and does not study the color matching problem of multi-color magnetic anti-counterfeiting images; when the magnetic orientation device and the magnetic shaping device are used together with the screen printer, there are still the following two problems:

[0004] One is the problem of smear. When using the magnetic orientation device and magnetic shaping device with the screen printer, there is always a 1-times rule, that is, the thickness of the ink layer must be 1 times or more than the pigment particle size to produce a three-dimensional effect. Therefore, the thickness of the screen printing ink layer needs to be more than 10 microns. If the ink layer is too thick, the deflection during magnetic orientation will not be complete, which will cause black smears to appear on the cross-section of many magnetic color sheets.

[0005] The second problem is the very slow printing speed. In order to prevent ink leakage during screen printing, the ink viscosity is relatively high, usually above 1200 pas (Pascal seconds), which will affect the magnetic orientation. In order to allow all magnetic pigments in the ink to achieve full magnetic orientation, the screen printer usually needs to stop and wait for about 2 to 3 seconds after each color is printed, resulting in a very slow printing speed and low color registration accuracy.

[0006] Therefore, there is an urgent need to develop a printing system and method for magnetic anti-counterfeiting images that can achieve high-precision color registration, better magnetic orientation effect, clearer visual disappearance of images and texts, and faster printing speed. Summary of the invention

[0007] The purpose of the present invention is to solve the technical problems of ghosting, very slow printing speed and low color registration accuracy when a magnetic anti-counterfeiting image is printed using a magnetic orientation device, a magnetic shaping device and a screen printer in the prior art, and to provide a multi-perspective magnetic anti-counterfeiting image printing system and printing method.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] A printing system for multi-view magnetic anti-counterfeiting images, which is special in that:

[0010] It includes a multi-color printing press, a plurality of magnetic rollers, and a plurality of magnetic orientation and shaping devices;

[0011] The multi-color printing machine comprises an unwinding device, an inlet device, a printing device, an outlet device and a rewinding device which are connected in sequence;

[0012] The unwinding device is used to place the substrate to be printed; the introducing device is used to introduce the substrate to be printed from the unwinding device to the input end of the printing device; the printing device includes a plurality of printing color groups, which are used to perform multi-color printing on the substrate to be printed; the exporting device is used to export the printed substrate from the output end of the printing device to the rewinding device; the rewinding device is used to rewind the exported printed substrate in real time;

[0013] The said introduction device and the said export device are both provided with a correction mechanism for correcting the deviation of the substrate in real time;

[0014] One or more magnetic rollers are respectively arranged on the front and / or back of the printing surface of the substrate between the printing roller and the printing discharge roller in each printing color group, for activating the magnetic pigment in the printed ink coating containing the magnetic pigment;

[0015] The number of the magnetic orientation and shaping devices is equal to the number of the printing color groups; each of the magnetic orientation and shaping devices is respectively arranged at a position between the magnetic roller closest to the printing discharge roller and the printing discharge roller in each printing color group in a one-to-one correspondence; each of the magnetic orientation and shaping devices includes an independent magnetic orientation device and a magnetic shaping device, and the independent magnetic orientation device and the magnetic shaping device are respectively located on opposite sides of the front and back sides of the printing surface at the same position of the substrate, and there is a gap between the two and the substrate;

[0016] The magnetic orientation device and the magnetic shaping device are used to magnetically orient and magnetically shape the magnetic pigments in the printed ink coating containing magnetic pigments, respectively, so as to print multi-viewing angle magnetic anti-counterfeiting images on the substrate.

[0017] Furthermore, in order to meet different printing needs, the multi-color printing press uses a multi-color relief printing press, a multi-color flexographic printing press or a multi-color gravure printing press. Among them, the multi-color relief printing press is suitable for printing small batches of products containing multi-viewing angle magnetic anti-counterfeiting images that do not require high overprinting accuracy but require frequent replacement of printing plates; the multi-color flexographic printing press is suitable for printing products containing multi-viewing angle magnetic anti-counterfeiting images that require high overprinting accuracy and require a printing speed that is significantly higher than that of relief printing; the multi-color gravure printing press is suitable for printing products containing multi-viewing angle magnetic anti-counterfeiting images that require not only accurate color registration and high printing speed, but also good anti-counterfeiting effect.

[0018] Furthermore, in order to better control the area that requires magnetic shaping and thus make the final printed multi-view magnetic anti-counterfeiting image have a better effect, a mask that matches the pattern of the multi-view magnetic anti-counterfeiting image to be printed is arranged between the magnetic shaping device and the substrate to achieve magnetic shaping only for the area that requires magnetic shaping.

[0019] Furthermore, the magnetic roller comprises a roller body and a plurality of first magnets embedded at irregular intervals on the outer cylindrical surface of the roller body;

[0020] The axis of the rotating shaft of the roller body is perpendicular to the transmission route of the substrate at its installation position; the roller body is made of non-magnetic material;

[0021] The plurality of first magnets are used to form an irregular magnetic field to activate the magnetic pigment in the printed ink coating containing the magnetic pigment. The irregular magnetic field helps to accelerate the activation of the magnetic pigment in the printed ink coating containing the magnetic pigment, which is beneficial to the subsequent magnetic orientation.

[0022] Furthermore, in order to make the magnetic orientation more accurate, and thus make the printed multi-viewing angle magnetic anti-counterfeiting image more accurate, the magnetic orientation device is an oriented magnetic roller;

[0023] The oriented magnetic roller comprises a magnetic roller body and a second magnet group embedded on the outer cylindrical surface of the magnetic roller body and matching the multi-viewing angle magnetic anti-counterfeiting image pattern to be printed;

[0024] The axis of the rotating shaft of the magnetic roller body is perpendicular to the transmission route of the substrate at the installation position; the magnetic roller body is made of non-magnetic conductive material;

[0025] The second magnet group is used to magnetically orient the magnetic pigments in the ink coating containing magnetic pigments printed in various areas on the substrate according to the magnetic field direction required by the design of the corresponding area on the multi-view magnetic anti-counterfeiting image to be printed, so as to obtain the visual effect required by the design.

[0026] Furthermore, the first magnet and the second magnet group both form a magnetic field through rare earth magnets, ferrites, rubber magnets, electromagnets or electromagnet groups;

[0027] The magnetic shaping device realizes magnetic shaping by combining one or more of hot air, heat curing, UV curing and EB curing.

[0028] At the same time, the present invention also provides a method for printing a multi-viewing angle magnetic anti-counterfeiting image, which is special in that it includes the following steps:

[0029] Step 1: Building the printing system of the multi-view magnetic anti-counterfeiting image;

[0030] Step 2: According to the requirements of the product containing the multi-viewing angle magnetic anti-counterfeiting image to be printed, a substrate is selected, and pre-press preparation is performed on the printing system of the multi-viewing angle magnetic anti-counterfeiting image built in step 1; during the pre-press preparation process, the viscosity of the ink coating containing the magnetic pigment selected needs to be between 200 Pascal·second and 1200 Pascal·second, and when making the printing plate and setting the parameters of the multi-color printing machine, the following conditions should be met: the thickness of the printing ink layer is controlled between 3 microns and 8 microns;

[0031] Step 3: Printing, including:

[0032] Step 3.1: placing the printing material selected in step 2 on the unwinding frame in the unwinding device of the multi-color printing press in the printing system of the multi-view magnetic anti-counterfeiting image, for which pre-press preparation has been completed in step 2;

[0033] Step 3.2: starting the multi-color printing machine, magnetic rollers and magnetic orientation and shaping devices in the printing system of the multi-view magnetic anti-counterfeiting image prepared in step 2, and the introduction device introduces the substrate placed on the unwinding rack in step 3.1 from the unwinding device to the input end of the printing device. During the introduction process, the correction mechanism in the introduction device corrects the substrate in real time;

[0034] Step 3.3: The plurality of printing color groups in the printing device print corresponding colors one by one on the substrate introduced in step 3.2. After each color is printed, the magnetic pigment in the ink coating of the color is activated, magnetically oriented and magnetically shaped by the magnetic roller and magnetic orientation and shaping device provided between the printing roller and the printing discharge roller in the printing color group, until the magnetic orientation and magnetic shaping of the last color are completed, so that a multi-viewing angle magnetic anti-counterfeiting image is printed on the substrate;

[0035] Step 3.4: The export device exports the substrate printed with the multi-view magnetic anti-counterfeiting image in step 3.3 from the output end of the printing device to the winding device. During the export process, the correction mechanism in the export device corrects the substrate in real time;

[0036] Step 3.5: The winding device winds up the substrate printed with the multi-viewing angle magnetic anti-counterfeiting image exported in step 3.4 in real time to obtain a product containing the multi-viewing angle magnetic anti-counterfeiting image, and the printing is completed.

[0037] Furthermore, in order to meet different printing needs, in the multi-view magnetic anti-counterfeiting image printing system constructed in step 1, the multi-color printing press is a multi-color letterpress printing press, a multi-color flexographic printing press or a multi-color gravure printing press.

[0038] Furthermore, in the printing system of the multi-viewing angle magnetic anti-counterfeiting image constructed in step 1, the multi-color printing machine is a multi-color gravure printing machine, and the magnetic setting device realizes magnetic setting by combining one or more of hot air, heat curing, UV curing, and EB curing;

[0039] In step 2, the selected printing substrate is PET polyester film, PC film, PVC heat shrinkable film, PP film or PE film; the selected ink coating containing magnetic pigments is UV type ink coating containing magnetic pigments, solvent-based ink coating containing magnetic pigments or water-based ink coating containing magnetic pigments; when making the printing plate, the mesh of the engraved plate is 25 mesh / square centimeter to 350 mesh / square centimeter, and the depth of the engraved plate is 10 microns to 100 microns.

[0040] Furthermore, in order to have a simple mechanical structure, a small footprint, a moderate viscosity effect, and an excellent angle orientation of the pigment particles after magnetization, and to make the volatile organic compound (VOC) content in the ink extremely low, which is more environmentally friendly, in the printing system of the multi-viewing angle magnetic anti-counterfeiting image constructed in step 1, the multi-color printing machine uses a multi-color gravure printing machine, and the magnetic setting device realizes magnetic setting by UV thermal curing, and the UV thermal curing uses a stroboscopic light source;

[0041] In step 2, the selected printing substrate is PET polyester film; the selected ink coating containing magnetic pigments is UV type ink coating containing magnetic pigments, and its viscosity is 500 Pascal seconds; when making the printing plate and setting the parameters of the multi-color printing machine, the mesh of the engraving is 250 mesh / square centimeter, the depth of the engraving is 30 microns to 50 microns, and the thickness of the printing ink layer is controlled between 6 microns and 8 microns.

[0042] UV thermal curing uses a stroboscopic light source, which can more conveniently achieve magnetic setting of areas that require magnetic setting, and not perform magnetic setting on areas that do not require magnetic setting, thereby making the final printed multi-viewing angle magnetic anti-counterfeiting image better.

[0043] The beneficial effects of the present invention are:

[0044] (1) In the printing system of the multi-viewing angle magnetic anti-counterfeiting image of the present invention, one or more magnetic rollers and magnetic orientation and shaping devices are sequentially arranged between the printing roller and the printing discharge roller in each printing color group of the multi-color printing press, thereby solving the color registration problem of the multi-color magnetic anti-counterfeiting image; and different types of multi-color printing presses such as a multi-color relief printing press, a multi-color flexographic printing press or a multi-color gravure printing press can be selected according to the actual printing requirements such as the characteristics of the specific product containing the multi-viewing angle magnetic anti-counterfeiting image to be printed, the printing quantity and the process;

[0045] Secondly, when a multi-color relief printing machine is used, the thickness of the printing ink layer can be controlled between 3 microns and 8 microns through plate making technology; when a multi-color flexographic printing machine is used, the thickness of the printing ink layer can be controlled between 1 micron and 5 microns through plate making technology; when a multi-color gravure printing machine is used, the thickness of the printing ink layer can be controlled between 1 micron and 150 microns through plate making technology; compared with a screen printing machine, a thinner ink layer thickness can be achieved, and the 1-fold law problem when a screen printing machine is used can be avoided, that is, the problem that the thickness of the ink layer needs to reach more than 10 microns; therefore, the printing system of the multi-viewing angle magnetic anti-counterfeiting image of the present invention can achieve a thinner ink layer thickness, make the visual disappearance of the image and text clearer, make the deflection during magnetic orientation more thorough, and greatly reduce the probability of smearing;

[0046] Furthermore, in the printing system of the multi-viewing angle magnetic anti-counterfeiting image of the present invention, the multi-color printing press can select a multi-color relief printing press, a multi-color flexographic printing press or a multi-color gravure printing press, so there is no need to worry about the ink leakage in the screen printing, so the ink coating containing magnetic pigments with low viscosity can be selected. The lower the viscosity of the ink coating containing magnetic pigments within a certain range, the more conducive to magnetic orientation, and the easier it is to print out the image and text with magnetic orientation effect, and then the magnetic orientation and magnetic shaping device can be quickly realized through the magnetic orientation shaping device, without stopping and waiting, so that the printing speed can be greatly improved, and the overprinting accuracy is also greatly improved compared with the case where the magnetic orientation device, the magnetic shaping device and the screen printing press are used together, and the magnetic orientation effect of the image and text is also better;

[0047] In summary, the present invention solves the technical problems in the prior art of using a magnetic orientation device, a magnetic shaping device together with a screen printer to print magnetic anti-counterfeiting images, such as ghosting, very slow printing speed and low color registration accuracy.

[0048] (2) In the printing system of the multi-viewing angle magnetic anti-counterfeiting image of the present invention, one or more magnetic rollers and magnetic orientation and shaping devices are sequentially arranged between the printing roller and the printing discharge roller in each printing color group; after each color printing is completed, the magnetic pigment in the printed ink coating containing the magnetic pigment is first activated by the magnetic roller, and then the magnetic pigment in the printed ink coating containing the magnetic pigment is magnetically oriented and magnetically shaped by the magnetic orientation and shaping device; relative to the direct magnetic orientation and magnetic shaping by the magnetic orientation and shaping device after each color printing is completed, the arrangement of the present invention can greatly improve the deflection efficiency of the magnetic pigment, making the brightness of the printed multi-viewing angle magnetic anti-counterfeiting image more brilliant.

[0049] (3) In the printing system of the multi-viewing angle magnetic anti-counterfeiting image of the present invention, it is preferred that the plurality of first magnets are embedded on the outer cylindrical surface of the roller body of the magnetic roller in an irregularly spaced manner, so that an irregular magnetic field can be formed, which helps to accelerate the activation of the magnetic pigment in the printed ink coating containing the magnetic pigment, and is beneficial to the subsequent magnetic orientation.

[0050] (4) In the printing system of the multi-view magnetic anti-counterfeiting image of the present invention, the magnetic orientation device is preferably an oriented magnetic roller, which includes a magnetic roller body and a second magnet group embedded in the outer cylindrical surface of the magnetic roller body and matching the multi-view magnetic anti-counterfeiting image pattern to be printed; using an oriented magnetic roller as the magnetic orientation device can make the magnetic orientation more accurate, thereby making the printed multi-view magnetic anti-counterfeiting image more accurate.

[0051] (5) In the printing system of the multi-view magnetic anti-counterfeiting image of the present invention, a mask matching the pattern of the multi-view magnetic anti-counterfeiting image to be printed is preferably arranged between the magnetic shaping device and the substrate, so that the area requiring magnetic shaping can be better controlled, thereby making the final printed multi-view magnetic anti-counterfeiting image have a better effect.

[0052] (6) The printing system and method of the multi-viewing angle magnetic anti-counterfeiting image of the present invention can realize magnetic shaping while printing without stopping and waiting, thereby greatly improving the printing speed. In addition, when a multi-color printing machine is selected as a multi-color gravure printing machine, accurate overprinting can be achieved with extremely high overprinting accuracy.

[0053] (7) When printing products containing multi-view magnetic anti-counterfeiting images, if the thickness of the ink layer is too thick, it is easy to cause the problem of smearing; if the thickness of the ink layer is too thin, the three-dimensional effect is not obvious, the magnetic pigment cannot be effectively deflected, and the anti-counterfeiting effect is poor; if the viscosity of the ink coating containing magnetic pigments is too high, the time for all magnetic pigments in the ink to achieve full magnetic orientation will be prolonged, thereby causing the printing speed to be unable to increase; however, if the viscosity of the ink coating containing magnetic pigments is too low, the magnetic pigments will be affected by their own gravity and cannot be effectively deflected; in the present invention, it is verified by experiments that when a multi-color printing press uses a multi-color gravure printing press, the thickness of the ink layer is controlled at 6 microns to 8 microns, and the viscosity is selected to be 500 pascals. When the ink coating containing magnetic pigments is coated with an ink of 1200 Pascal seconds, the magnetic deflection rate can reach 99%, the magnetic rotation speed can reach 0.1s, and the printed multi-view magnetic anti-counterfeiting image has the best effect; compared with the case where a screen printing machine is used, when the thickness of the ink layer takes the minimum value of 10 microns for screen printing and the viscosity of the ink coating containing magnetic pigments also takes the minimum value of 1200 Pascal seconds for screen printing, the corresponding magnetic deflection rate is only 50%, and the magnetic rotation speed is only 0.5s. Obviously, by using the printing system and printing method of the multi-view magnetic anti-counterfeiting image of the present invention, the magnetic deflection rate and the magnetic rotation speed are greatly improved, and the printed product containing the multi-view magnetic anti-counterfeiting image has a better anti-counterfeiting effect.

[0054] (8) In the printing system and printing method of the multi-viewing angle magnetic anti-counterfeiting image of the present invention, when the magnetic setting device realizes magnetic setting by means of UV thermal curing, the UV thermal curing preferably adopts a stroboscopic light source, which can more conveniently realize magnetic setting of the area requiring magnetic setting, and not magnetic setting of the area not requiring magnetic setting, thereby making the effect of the multi-viewing angle magnetic anti-counterfeiting image finally printed better. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a structural schematic diagram of an embodiment of a printing system for multi-viewing angle magnetic anti-counterfeiting images of the present invention;

[0056] Figure 2 2 is a schematic diagram of the structure of a magnetic roller in an embodiment of a printing system for multi-viewing angle magnetic anti-counterfeiting images of the present invention;

[0057] Figure 3 Schematic diagram of the relative position relationship between the magnetic roller and the substrate in the embodiment of the printing system of the multi-viewing angle magnetic anti-counterfeiting image of the present invention;

[0058] Figure 4 2 is a schematic structural diagram of an oriented magnetic roller in an embodiment of a printing system for multi-viewing angle magnetic anti-counterfeiting images of the present invention;

[0059] Figure 5 It is a schematic diagram of the relative position relationship between the oriented magnetic roller and the printing material in the embodiment of the printing system of the multi-viewing angle magnetic anti-counterfeiting image of the present invention.

[0060] The descriptions of the numbers in the figure are as follows:

[0061] 1-unwinding device, 2-introduction device, 3-printing device, 31-printing roller, 4-exporting device, 5-winding device, 6-magnetic orientation and shaping device, 61-magnetic orientation device, 611-magnetic roller body, 612-second magnet group, 62-magnetic shaping device, 7-magnetic roller, 71-roller body, 72-first magnet, 01-substrate. DETAILED DESCRIPTION

[0062] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] See also Figure 1 A printing system for multi-view magnetic anti-counterfeiting images includes a multi-color printing press, multiple magnetic rollers 7 and multiple magnetic orientation and shaping devices 6.

[0064] See also Figure 1The multi-color printing machine comprises an unwinding device 1, an inlet device 2, a printing device 3, an outlet device 4 and a reeling device 5 connected in sequence; the unwinding device 1 is used to place the substrate 01 to be printed; the inlet device 2 is used to introduce the substrate 01 to be printed from the unwinding device 1 to the input end of the printing device 3; the printing device 3 comprises a plurality of printing color groups, which are used to perform multi-color printing on the substrate 01 to be printed; the outlet device 4 is used to export the printed substrate 01 from the output end of the printing device 3 to the reeling device 5; the reeling device 5 is used to reel the exported printed substrate 01 in real time; the inlet device 2 and the outlet device 4 are both provided with a correction mechanism for real-time correction of the substrate 01. According to the characteristics of the specific product to be printed containing multi-view magnetic anti-counterfeiting images, the printing quantity and the actual printing requirements such as the process, the multi-color printing machine can use different types of printing machines such as a multi-color relief printing machine, a multi-color flexographic printing machine or a multi-color gravure printing machine. Among them, the multi-color relief printing machine is suitable for printing small batches of products containing multi-view magnetic anti-counterfeiting images that do not require high overprint accuracy but require frequent replacement of printing plates; the multi-color flexographic printing machine is suitable for printing products containing multi-view magnetic anti-counterfeiting images that require high overprint accuracy and require a printing speed that is significantly higher than that of relief printing; the multi-color gravure printing machine is suitable for printing products containing multi-view magnetic anti-counterfeiting images that require not only accurate color registration and high printing speed, but also good anti-counterfeiting effects. In this embodiment, the multi-color printing machine uses a multi-color gravure printing machine. The printing plate roller of the multi-color gravure printing machine can be a laser direct engraving roller, an electric engraving roller or a laser roller. In this embodiment, in order to accurately control the mesh shape, the depth and width of the engraved plate and other dimensional parameters, so that the pattern details are clearly presented, the printing plate roller of the multi-color gravure printing machine in this embodiment preferably adopts a laser direct engraving roller. When the printing plate roller adopts a laser direct engraving roller, no chemical corrosive agent is used, so it is also more environmentally friendly.

[0065] See also Figure 1 In each printing color group, one or more magnetic rollers 7 are respectively arranged on the front and / or back of the printing surface of the substrate 01 between the printing roller 31 and the printing discharge roller, for activating the magnetic pigment in the printed ink coating containing magnetic pigment; in this embodiment, one magnetic roller 7 is arranged in each printing color group; in addition to one magnetic roller 7 as in this embodiment, multiple magnetic rollers can also be arranged, and multiple magnetic rollers can be arranged on the front of the printing surface of the substrate 01, or on the back of the printing surface of the substrate 01, or on both the front and back of the printing surface of the substrate 01. The number and arrangement position of the magnetic rollers 7 are determined by the multi-viewing angle magnetic anti-counterfeiting image to be printed. Figure 2 and Figure 3In this embodiment, the magnetic roller 7 preferably includes a roller body 71 and a plurality of first magnets 72 irregularly spaced and embedded on the outer cylindrical surface of the roller body 71; the axis of the rotating shaft of the roller body 71 is perpendicular to the transmission route of the substrate 01 at its installation position; the roller body 71 is made of non-magnetic conductive material; the plurality of first magnets 72 are used to form an irregular magnetic field, which helps to accelerate the activation of the magnetic pigment in the printed ink coating containing magnetic pigments, and is beneficial to the subsequent magnetic orientation. The first magnet 72 can form a magnetic field through rare earth magnets, ferrites, rubber magnets, electromagnets or electromagnet groups; in this embodiment, the first magnet 72 preferably forms a magnetic field through rare earth magnets of neodymium iron boron.

[0066] See also Figure 1 , the number of the above-mentioned magnetic orientation and shaping devices 6 is equal to the number of the above-mentioned printing color groups; the above-mentioned magnetic orientation and shaping devices 6 are respectively arranged in a one-to-one correspondence at a position between the above-mentioned magnetic roller 7 and the printing discharge roller which are closest to the printing discharge roller in each printing color group; each magnetic orientation and shaping device 6 includes an independent magnetic orientation device 61 and a magnetic shaping device 62, and the independent magnetic orientation device 61 and the magnetic shaping device 62 are respectively located on opposite sides of the front and back sides of the printing surface at the same position of the substrate 01, and there is a gap between the two and the substrate 01, and the size of the gap is determined by the fixed magnetic angle and the shaping form of the multi-perspective magnetic anti-counterfeiting image to be printed, which is an empirical value; the above-mentioned magnetic orientation device 61 and the magnetic shaping device 62 are respectively used for magnetic orientation and magnetic shaping of the magnetic pigments in the printed ink coating containing magnetic pigments, so that a multi-perspective magnetic anti-counterfeiting image is printed on the substrate 01. The specific structures of the above-mentioned magnetic orientation device 61 and magnetic shaping device 62 can adopt the structures of the magnetic orientation device and magnetic shaping device disclosed in the invention patent CN103962292A, a magnetic pigment coating equipment and coating process; in addition to adopting the structures of the magnetic orientation device and magnetic shaping device disclosed in the patent, other magnetic orientation devices that can achieve magnetic orientation and other magnetic shaping devices that can achieve magnetic shaping can also be adopted.

[0067] See also Figure 4 and Figure 5In this embodiment, in order to make the magnetic orientation more accurate and thus make the printed multi-view magnetic anti-counterfeiting image more accurate, the magnetic orientation device 61 is preferably an oriented magnetic roller; the oriented magnetic roller includes a magnetic roller body 611 and a second magnet group 612 embedded on the outer cylindrical surface of the magnetic roller body 611 and matching the multi-view magnetic anti-counterfeiting image pattern to be printed; the axis of the rotating shaft of the magnetic roller body 611 is perpendicular to the transmission route of the substrate 01 at its installation position; the magnetic roller body 611 is made of non-magnetic conductive material; the second magnet group 612 is used to magnetically orient the magnetic pigments in the ink coating containing magnetic pigments printed in each area on the substrate 01 according to the magnetic field direction of the corresponding area design requirements on the multi-view magnetic anti-counterfeiting image to be printed, so as to obtain the visual effect required by the design. The second magnet group 612 can form a magnetic field through rare earth magnets, ferrites, rubber magnets, electromagnets or electromagnet groups; in this embodiment, the second magnet group 612 preferably forms a magnetic field through rare earth magnets of neodymium iron boron. The magnetic shaping device 62 can achieve magnetic shaping through one or more combinations of hot air, thermal curing, UV curing, and EB curing; in this embodiment, the magnetic shaping device 62 preferably achieves magnetic shaping through UV thermal curing, and the UV thermal curing preferably uses a stroboscopic light source, so that it is more convenient to magnetically shape the area that needs magnetic shaping, and not to magnetically shape the area that does not need magnetic shaping, so that the effect of the multi-view magnetic anti-counterfeiting image printed in the end can be better. In order to better control the area that needs magnetic shaping, and thus make the effect of the multi-view magnetic anti-counterfeiting image printed in the end better, a mask that matches the multi-view magnetic anti-counterfeiting image pattern to be printed can also be set between the magnetic shaping device 62 and the substrate 01, so as to achieve magnetic shaping only for the area that needs magnetic shaping.

[0068] In addition, the present invention also provides a method for printing a multi-viewing angle magnetic anti-counterfeiting image, comprising the following steps:

[0069] Step 1: construct the above-mentioned multi-view magnetic anti-counterfeiting image printing system; the multi-color printing machine in the constructed multi-view magnetic anti-counterfeiting image printing system can be a multi-color letterpress printing machine, a multi-color flexographic printing machine or a multi-color gravure printing machine; the magnetic shaping device 62 in the magnetic orientation shaping device 6 in the constructed multi-view magnetic anti-counterfeiting image printing system can achieve magnetic shaping by one or more combinations of hot air, thermal curing, UV curing, and EB curing; in this embodiment, the multi-color printing machine is a multi-color gravure printing machine, and the magnetic shaping device 62 in the magnetic orientation shaping device 6 achieves magnetic shaping by UV thermal curing, and the UV thermal curing uses a stroboscopic light source, which can more conveniently realize magnetic shaping of the area requiring magnetic shaping, and not magnetic shaping of the area not requiring magnetic shaping, thereby making the final printed multi-view magnetic anti-counterfeiting image have a better effect;

[0070] Step 2: According to the requirements of the product containing the multi-viewing magnetic anti-counterfeiting image to be printed, select the printing material 01, and perform pre-press preparation on the printing system of the multi-viewing magnetic anti-counterfeiting image built in step 1; during the pre-press preparation process, the viscosity of the selected ink coating containing magnetic pigments needs to be between 200 Pascal·seconds and 1200 Pascal·seconds, and when making the printing plate and setting the parameters of the multi-color printing machine, the following conditions should be met: the thickness of the printing ink layer is controlled between 3 microns and 8 microns; taking the multi-color printing machine using a multi-color gravure printing machine as an example, the above-selected printing material 01 can be PET polyester film, PC film, PVC heat shrink film, PP film or PE film, etc.; the above-selected ink coating containing magnetic pigments The material can be a UV type ink coating containing magnetic pigments, a solvent type ink coating containing magnetic pigments, or a water-based ink coating containing magnetic pigments, etc.; when making the printing plate, the mesh of the engraved plate is 25 mesh / square centimeter to 350 mesh / square centimeter, and the depth of the engraved plate is 10 microns to 100 microns; in this embodiment, the substrate 01 preferably selected is a pet polyester film, and the selected ink coating containing magnetic pigments is a UV type ink coating containing magnetic pigments, and its viscosity is 500 Pascal·seconds. When making the printing plate and setting parameters for the multi-color printing machine, the mesh of the engraved plate is 250 mesh / square centimeter, the depth of the engraved plate is 30 microns to 50 microns, and the thickness of the printing ink layer is controlled between 6 microns and 8 microns;

[0071] Step 3: Printing, including:

[0072] Step 3.1: placing the printing material 01 selected in step 2 on the unwinding frame in the unwinding device 1 of the multi-color printing press in the printing system of the multi-view magnetic anti-counterfeiting image prepared before printing in step 2;

[0073] Step 3.2: Start the multi-color printing machine, magnetic rollers 7 and magnetic orientation and shaping devices 6 in the printing system of the multi-view magnetic anti-counterfeiting image prepared in step 2, and the introduction device 2 introduces the substrate 01 placed on the unwinding rack in step 3.1 from the unwinding device 1 to the input end of the printing device 3. During the introduction process, the correction mechanism in the introduction device 2 corrects the deviation of the substrate 01 in real time;

[0074] Step 3.3: The multiple printing color groups in the printing device 3 print the corresponding colors one by one on the substrate 01 introduced in step 3.2. After each color is printed, the magnetic pigment in the ink coating of the color is activated, magnetically oriented and magnetically shaped by the magnetic roller 7 and the magnetic orientation and shaping device 6 arranged between the printing roller 31 and the printing discharge roller in the printing color group, until the magnetic orientation and magnetic shaping of the last color are completed, so that a multi-viewing angle magnetic anti-counterfeiting image is printed on the substrate 01;

[0075] Step 3.4: the export device 4 exports the substrate 01 printed with the multi-view magnetic anti-counterfeiting image in step 3.3 from the output end of the printing device 3 to the winding device 5. During the export process, the correction mechanism in the export device 4 corrects the substrate 01 in real time;

[0076] Step 3.5: The winding device 5 winds up the substrate 01 printed with the multi-viewing angle magnetic anti-counterfeiting image exported in step 3.4 in real time to obtain a product containing the multi-viewing angle magnetic anti-counterfeiting image, and the printing is completed.

[0077] Table 1 below is a comparison table of relevant parameters when a magnetic orientation device and a magnetic shaping device are used together with a screen printer, a coating machine, and a multi-color relief / flexographic / gravure printing machine to print magnetic anti-counterfeiting images.

[0078] Table 1:

[0079]

[0080]

[0081] As can be seen from Table 1 above, when the magnetic orientation device and the magnetic shaping device are used together with the multi-color relief / flexographic / intaglio printing machine for magnetic anti-counterfeiting image printing, compared with the use with the screen printer and the coating machine, the ink layer has the thinnest thickness, the lowest viscosity value of the ink coating containing magnetic pigments except the multi-color relief printing machine is the smallest, the maximum magnetic turning rate that can be achieved, the fastest magnetic turning speed, and the ink consumption is only the ink consumption of the printing part. Therefore, when the printing system and printing method of the multi-viewing angle magnetic anti-counterfeiting image of the present invention are used to print the magnetic anti-counterfeiting image, not only the anti-counterfeiting effect of the printed multi-viewing angle magnetic anti-counterfeiting image is better, but also the ink coating is saved, which is more economical. It has been verified by experiments that when the multi-color printing machine uses a multi-color intaglio printing machine, the depth of the engraving is controlled to 30 microns to 50 microns, the thickness of the printing ink layer is controlled to be between 6 microns and 8 microns, and the ink coating containing magnetic pigments with a viscosity of 500 Pascal seconds is selected, the multi-viewing angle magnetic anti-counterfeiting image obtained by printing has the best effect.

[0082] In summary, the printing system and printing method of the multi-viewing angle magnetic anti-counterfeiting image of the present invention can realize magnetic setting while printing without stopping and waiting, thereby greatly improving the printing speed. Moreover, when a multi-color printing machine adopts a multi-color gravure printing machine, there will be no smear problem, and accurate overprinting can be achieved with extremely high overprinting accuracy.

Claims

1. A printing system for multi-view magnetic anti-counterfeiting images, characterized in that: It comprises a multi-color printing press, a plurality of magnetic rollers (7) and a plurality of magnetic orientation and shaping devices (6); The multi-color printing machine comprises an unwinding device (1), an importing device (2), a printing device (3), an exporting device (4) and a rewinding device (5) which are connected in sequence; The unwinding device (1) is used for placing the substrate (01) to be printed; the importing device (2) is used for importing the substrate (01) to be printed from the unwinding device (1) to the input end of the printing device (3); the printing device (3) comprises a plurality of printing color groups, which are used for performing multi-color printing on the substrate (01) to be printed; the exporting device (4) is used for exporting the printed substrate (01) from the output end of the printing device (3) to the rewinding device (5); the rewinding device (5) is used for rewinding the exported printed substrate (01) in real time; The introduction device (2) and the export device (4) are both provided with a correction mechanism for correcting the deviation of the printing material (01) in real time; One or more magnetic rollers (7) are respectively arranged between the printing roller (31) and the printing discharge roller in each printing color group on the front and / or back side of the printing surface of the substrate (01), for activating the magnetic pigment in the printed ink coating containing the magnetic pigment; The number of the magnetic orientation and shaping devices (6) is equal to the number of the printing color groups; each of the magnetic orientation and shaping devices (6) is respectively arranged in a one-to-one correspondence at a position between the magnetic roller (7) closest to the printing discharge roller and the printing discharge roller in each printing color group; each of the magnetic orientation and shaping devices (6) comprises an independent magnetic orientation device (61) and a magnetic shaping device (62), and the independent magnetic orientation device (61) and the magnetic shaping device (62) are respectively located on opposite sides of the front and back sides of the printing surface at the same position of the substrate (01), and there is a gap between the two and the substrate (01); The magnetic orientation device (61) and the magnetic shaping device (62) are used to magnetically orient and magnetically shape the magnetic pigments in the printed ink coating containing magnetic pigments, respectively, so as to print a multi-viewing angle magnetic anti-counterfeiting image on the substrate (01).

2. The multi-view magnetic anti-counterfeiting image printing system according to claim 1, characterized in that: The multi-color printing press is a multi-color relief printing press, a multi-color flexographic printing press or a multi-color gravure printing press.

3. The printing system of multi-view magnetic anti-counterfeiting images according to claim 2, characterized in that: A mask matching the multi-viewing angle magnetic anti-counterfeiting image pattern to be printed is arranged between the magnetic shaping device (62) and the substrate (01), so as to achieve magnetic shaping only for the area requiring magnetic shaping.

4. The multi-viewing angle magnetic anti-counterfeiting image printing system according to claim 2, characterized in that: The magnetic roller (7) comprises a roller body (71) and a plurality of first magnets (72) embedded at irregular intervals on the outer cylindrical surface of the roller body (71); The axis of the rotating shaft of the roller body (71) is perpendicular to the transmission route of the substrate (01) at the installation position thereof; the roller body (71) is made of non-magnetic conductive material; The plurality of first magnets (72) are used to form an irregular magnetic field to activate the magnetic pigment in the printed ink coating containing the magnetic pigment.

5. The printing system of multi-viewing angle magnetic anti-counterfeiting image according to claim 4, characterized in that: The magnetic orientation device (61) is an orientation magnetic roller; The oriented magnetic roller comprises a magnetic roller body (611) and a second magnet group (612) embedded on the outer cylindrical surface of the magnetic roller body (611) and matching the multi-viewing angle magnetic anti-counterfeiting image pattern to be printed; The axis of the rotating shaft of the magnetic roller body (611) is perpendicular to the transmission route of the substrate (01) at the installation position thereof; the magnetic roller body (611) is made of non-magnetic conductive material; The second magnet group (612) is used to magnetically orient the magnetic pigments in the ink coating containing magnetic pigments printed in various areas on the substrate (01) according to the magnetic field direction required by the design of the corresponding area on the multi-viewing angle magnetic anti-counterfeiting image to be printed, so as to obtain the visual effect required by the design.

6. The printing system of multi-viewing angle magnetic anti-counterfeiting image according to claim 5, characterized in that: The first magnet (72) and the second magnet group (612) both form a magnetic field through rare earth magnets, ferrites, rubber magnets, electromagnets or electromagnet groups; The magnetic shaping device (62) achieves magnetic shaping by combining one or more of hot air, thermal curing, UV curing, and EB curing.

7. A method for printing a multi-viewing angle magnetic anti-counterfeiting image, characterized in that: The following steps are involved: Step 1: constructing the printing system of the multi-viewing angle magnetic anti-counterfeiting image as claimed in claim 1; Step 2: According to the requirements of the product containing the multi-viewing angle magnetic anti-counterfeiting image to be printed, a substrate (01) is selected, and pre-press preparation is performed on the printing system of the multi-viewing angle magnetic anti-counterfeiting image constructed in step 1; during the pre-press preparation process, the viscosity of the ink coating containing the magnetic pigment is selected to be between 200 Pascal·second and 1200 Pascal·second, and when making the printing plate and setting the parameters of the multi-color printing machine, the following conditions should be met: the thickness of the printing ink layer is controlled between 3 microns and 8 microns; Step 3: Printing, including: Step 3.1: placing the printing material (01) selected in step 2 on the unwinding frame of the unwinding device (1) of the multi-color printing machine in the printing system of the multi-view magnetic anti-counterfeiting image, which has been prepared before printing in step 2; Step 3.2: starting the multi-color printing machine, the magnetic rollers (7) and the magnetic orientation and shaping devices (6) in the printing system of the multi-view magnetic anti-counterfeiting image prepared before printing in step 2, the introduction device (2) introduces the substrate (01) placed on the unwinding rack in step 3.1 from the unwinding device (1) to the input end of the printing device (3), and during the introduction process, the correction mechanism in the introduction device (2) corrects the substrate (01) in real time; Step 3.3: The plurality of printing color groups in the printing device (3) print corresponding colors one by one on the substrate (01) introduced in step 3.

2. After each color is printed, the magnetic pigment in the ink coating of the color is activated, magnetically oriented and magnetically shaped by the magnetic roller (7) and the magnetic orientation and shaping device (6) arranged between the printing roller (31) and the printing discharge roller in the printing color group, until the magnetic orientation and magnetic shaping of the last color are completed, so that a multi-viewing angle magnetic anti-counterfeiting image is printed on the substrate (01); Step 3.4: The export device (4) exports the substrate (01) printed with the multi-viewing magnetic anti-counterfeiting image in step 3.3 from the output end of the printing device (3) to the winding device (5). During the export process, the correction mechanism in the export device (4) corrects the substrate (01) in real time. Step 3.5: The winding device (5) winds up the substrate (01) printed with the multi-viewing angle magnetic anti-counterfeiting image exported in step 3.4 in real time to obtain a product containing the multi-viewing angle magnetic anti-counterfeiting image, thereby completing printing.

8. The method for printing a multi-viewing angle magnetic anti-counterfeiting image according to claim 7, characterized in that: In the multi-viewing angle magnetic anti-counterfeiting image printing system constructed in step 1, the multi-color printing press is a multi-color letterpress printing press, a multi-color flexographic printing press or a multi-color gravure printing press.

9. The method for printing a multi-viewing angle magnetic anti-counterfeiting image according to claim 7, characterized in that: In the printing system of the multi-view magnetic anti-counterfeiting image constructed in step 1, the multi-color printing machine is a multi-color gravure printing machine, and the magnetic setting device (62) realizes magnetic setting by combining one or more of hot air, heat curing, UV curing, and EB curing; In step 2, the selected printing substrate (01) is a PET polyester film, a PC film, a PVC heat shrinkable film, a PP film or a PE film; the selected ink coating containing magnetic pigments is a UV-type ink coating containing magnetic pigments, a solvent-based ink coating containing magnetic pigments or a water-based ink coating containing magnetic pigments; when making the printing plate, the mesh of the engraved plate is 25 mesh / square centimeter to 350 mesh / square centimeter, and the depth of the engraved plate is 10 microns to 100 microns.

10. The method for printing a multi-viewing angle magnetic anti-counterfeiting image according to claim 7, characterized in that: In the printing system of the multi-view magnetic anti-counterfeiting image constructed in step 1, the multi-color printing machine is a multi-color gravure printing machine, the magnetic shaping device (62) realizes magnetic shaping by UV thermal curing, and the UV thermal curing adopts a stroboscopic light source; In step 2, the selected printing substrate (01) is a PET polyester film; the selected ink coating containing magnetic pigments is a UV type ink coating containing magnetic pigments, and its viscosity is 500 Pascal seconds; when making the printing plate and setting parameters for the multi-color printing machine, the mesh of the engraved plate is 250 mesh / square centimeter, the depth of the engraved plate is 30 microns to 50 microns, and the thickness of the printing ink layer is controlled between 6 microns and 8 microns.

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