Multi-optical-color optically variable printing apparatus and printing method thereof

Abstract

Disclosed in the present application is a multi-optical-color optically variable printing apparatus. The multi-optical-color optically variable printing apparatus comprises a conveying portion, a silk-screen printing unit, a first optical-color optically variable pattern forming unit, a second optical-color optically variable pattern forming unit and a transmission system, wherein the conveying portion is used for conveying a base material to be printed; the silk-screen printing unit is in the next procedure of the conveying portion, and is used for imprinting ink or varnish onto said base material that is conveyed by the conveying portion, so as to form a semi-finished product; the first optical-color optically variable pattern forming unit is in the next procedure of the silk-screen printing unit, and is used for forming a first optical-color optically variable pattern on a first region of the semi-finished product; and the second optical-color optically variable pattern forming unit is in the next procedure of the first optical-color optically variable pattern forming unit, and is used for forming a second optical-color optically variable pattern on a second region of the semi-finished product. By means of the present application, for the same silk-screen printing pattern, multi-optical-color optically variable technology with a plurality of effects can be realized, and the stitching of a plurality of effect patterns can also be realized.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This disclosure claims priority to Chinese Patent Application No. 202110795827.6 filed with China National Intellectual Property Administration on July 14, 2021 and entitled "MULTI-OPTICAL-COLOR OPTICALLY VARIABLE PRINTING APPARATUS AND PRINTING METHOD THEREOF", the entire contents of which are herein incorporated by reference.FIELD

[0002] The present disclosure relates to a multi-optical-color optically variable printing apparatus, a printing method and a pre-drying and curing adjusting apparatus, and belongs to the field of the production of securities.BACKGROUND

[0003] An optical-color optically variable technology is also called an SPARK technology, and refers to a technology that an OVMI (Optically Variable Magnetic Ink) is subjected to a silk-screen printing and magnetic orientation process and then a dynamic optically variable phenomenon is generated.

[0004] A patent document with the publication number CN103547454B and entitled "Associated Printing Apparatus" and a patent document with the publication number CN103192591B and entitled "Magnetic Orientation Drum And Printer" disclose that apparatuses that can achieve the optical-color optically variable technology are mainly a KBA silk-screen machine and a silk embossing associated banknote printing machine developed by our country independently.

[0005] Currently, for the same silk-screen printing pattern, worldwide printing apparatuses can only achieve an optical-color optically variable technology with a single effect, that is, a scrolling effect under the effect of a single magnetic field is achieved or a Motion effect under the effect of a compound magnetic field is achieved, while there still is not any multi-optical-color optically variable technology that achieves two or more than two effects at the same time.SUMMARY

[0006] One problem to be solved by the present disclosure lies in providing a pre-drying and curing adjusting apparatus.

[0007] Another problem to be solved by the present disclosure lies in providing a multi-optical-color optically variable printing method.

[0008] In order to achieve the above purposes, the present disclosure adopts the following embodiments: a multi-optical-color optically variable printing apparatus comprises a conveying portion, a silk-screen printing unit, a first optical-color optically variable pattern forming unit, a second optical-color optically variable pattern forming unit and a transmission system; the conveying portion is used for conveying a base material to be printed; the silk-screen printing unit is in the next procedure of the conveying portion, and is used for imprinting a printing ink or varnish onto the base material that is conveyed by the conveying portion and is to be printed, to form a semi-finished product; the first optical-color optically variable pattern forming unit is in the next procedure of the silk-screen printing unit, and is used for forming a first optical-color optically variable pattern on a first region of the semi-finished product; the second optical-color optically variable pattern forming unit is in the next procedure of the first optical-color optically variable pattern forming unit, and is used for forming a second optical-color optically variable pattern on a second region of the semi-finished product; and the transmission system comprises multiple conveying rollers for conveying the base material to be printed. in a further embodiment, the first optical-color optically variable pattern forming unit comprises a first magnetic orientation unit and a first pre-drying and curing unit; the first magnetic orientation unit and the first pre-drying and curing unit are spaced by a preset distance and are provided opposite to each other; the first magnetic orientation unit is configured to conduct magnetic orientation to the first region of the semi-finished product; and the first pre-drying and curing unit is configured to dry and cure the first region. in a further embodiment, the first optical-color optically variable pattern forming unit further comprises a pre-drying and curing adjusting apparatus, and the pre-drying and curing adjusting apparatus comprises a light shield and a light shielding region adjusting mechanism; the light shield extends along a long axis direction of the first magnetic orientation unit, the light shield is provided with multiple windows, and the windows correspond to a magnetic orientation region of the first magnetic orientation unit; and the light shielding region adjusting mechanism is provided on the windows, and is configured to adjust a light transmission region of the windows. in a further embodiment, the light shielding region adjusting mechanism adjusts the light transmission region of the windows through moving between a first position and a second position; and the light transmission region of the windows when the light shielding region adjusting mechanism is at the first position is different from the light transmission region of the windows when the light shielding region adjusting mechanism is at the second position. in a further embodiment, the first optical-color optically variable pattern forming unit further comprises a split type pre-drying and curing mechanism, and the split type pre-drying and curing mechanism comprises a fixing beam, a motor and a curing apparatus; the fixing beam extends along the long axis direction of the first magnetic orientation unit; and the curing apparatus is mounted on the fixing beam, and can move along the fixing beam under the driving of the motor. in a further embodiment, the split type pre-drying and curing mechanism further comprises a side baffle, and the side baffle is provided at the side edge of the curing apparatus and is configured to shield the light of the curing apparatus. in a further embodiment, the second optical-color optically variable pattern forming unit comprises a second magnetic orientation unit and a second pre-drying and curing unit; the second magnetic orientation unit is configured to conduct magnetic orientation to the second region of the semi-finished product; the second pre-drying and curing unit and the second magnetic orientation unit are spaced by a preset distance, and the second pre-drying and curing unit dries and cures the second region. in a further embodiment, the first pre-drying and curing unit corresponds to the first region to conduct pre-drying and curing; and the second pre-drying and curing unit corresponds to the first region and the second region. in a further embodiment, a rearrangement magnetizing apparatus is further contained, and the rearrangement magnetizing apparatus is provided between the silk-screen printing unit and the first optical-color optically variable pattern forming unit, and between the first optical-color optically variable pattern forming unit and the second optical-color optically variable pattern forming unit.

[0009] A multi-optical-color optically variable effect printing method uses the above multi-optical-color optically variable printing apparatus, and comprises following steps: S 1, imprinting ink or varnish onto the base material to be printed to form the semi-finished product; S2, sequentially conveying the semi-finished product to the first optical-color optically variable pattern forming unit, pre-drying and curing the first region through the first pre-drying and curing unit while the first region of the semi-finished product is magnetized and positioned, and then forming a first optically variable product; S3, conveying the first optically variable product after the step S2 is completed to the second optical-color optically variable pattern forming unit, conducting pre-drying and curing while the second region of the semi-finished product is magnetized and positioned, and then forming a second optically variable product; and S4, conveying the second optically variable product to a drying and curing unit for drying and curing, and then forming a final product.

[0010] The present disclosure comprises following effects: compared with the prior art, the present disclosure provides a pre-drying and curing adjusting apparatus, a multi-optical-color optically variable printing apparatus and a printing method, through providing magnetic orientation units of different magnetic field effects and an adjustable pre-drying and curing mechanism, a multi-optical-color optically variable technology with multiple effects can be achieved for the same silk-screen printing pattern, and a technology of stitching multiple effect patterns is further achieved. The multiple effects can be any effect of the three cases as follows: 1, multiple scrolling effects under the effect of a single magnetic field; 2, multiple Motion effects under the effect of a compound magnetic field; and 3, a scrolling effect under the effect of a single magnetic field and a Motion effect under the effect of a compound magnetic field.BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG. 1 is a schematic view of the structure of the first type of a multi-optical-color optically variable printing apparatus of the present disclosure; FIG. 2 is a schematic view of the structure of the first type of a first optical-color optically variable pattern forming unit of the present disclosure; FIG. 3a is a schematic view of the structure of the pre-drying and curing adjusting apparatus in FIG. 2; FIG. 3b is a schematic view of the structure of the light shielding region adjusting mechanism in FIG. 3a; FIG. 4 is a schematic view of another structure of the first type of a first optical-color optically variable pattern forming unit of the present disclosure; FIG. 5 is a schematic view of another structure of the first type of a first optical-color optically variable pattern forming unit of the present disclosure; FIG. 6 is a schematic view of the structure of the split type pre-drying and curing mechanism in FIG. 5; FIG. 7 is a schematic view of the structure of a second optical-color optically variable pattern forming unit of the present disclosure; FIG. 8 is a schematic view of the arrangement manner of OVMP pigment sheets in a printing ink; and FIG. 9 is a schematic view of the structure of the second type of a multi-optical-color optically variable printing apparatus of the present disclosure.

[0012] In the accompanying drawings, the reference signs represent the following: 1 conveying portion; 2 silk-screen printing unit; 3 first optical-color optically variable pattern forming unit; 31 first magnetic orientation unit; 311 magnetic orientation region; 32 pre-drying and curing adjusting apparatus; 321 light shield; 322 light shielding region adjusting mechanism; 3221 window light shield; 3222 light shield guide rail; 3223 adjusting screw; 3224 locking nut; 3225 screw hole; 323 window; 324 reinforcing rib; 33 first pre-drying and curing unit; 34 split type pre-drying and curing mechanism; 341 fixing beam; 3411 transverse plate; 3412 vertical plate; 342 motor; 343 motor guide rail; 344 fixing beam guide rail; 345 curing apparatus; 346 side baffle; 4 second optical-color optically variable pattern forming unit; 41 second magnetic orientation unit; 42 second pre-drying and curing unit; 5 transmission system; 6 drying and curing unit; 7 rearrangement magnetizing apparatus; 12 OVMP pigment sheet; and 13 base material.DETAILED DESCRIPTION OF THE DISCLOSURE

[0013] The contents of the present disclosure are detailed hereinafter in combination with the accompanying drawings and specific embodiments.

[0014] As shown in FIG. 1, a multi-optical-color optically variable printing apparatus provided in the present disclosure comprises a conveying portion 1, a silk-screen printing unit 2, a first optical-color optically variable pattern forming unit 3, a second optical-color optically variable pattern forming unit 4 and a transmission system 5. The transmission system 5 comprises multiple conveying rollers for conveying a base material to be printed. In the present embodiment, there are two groups of optical-color optically variable pattern forming units, however, in actual use, multiple groups can be arranged according to actual needs.

[0015] In an embodiment, the conveying portion 1 is used for conveying the base material to be printed. The base material to be printed is securities, paper, etc. The conveying portion 1 conveys the base material to be printed to the next procedure (the lower reaches of the forward direction of the securities). The silk-screen printing unit 2 is in the next procedure (the position at the lower reaches of the conveying portion 1 along the travel direction of the base material to be printed) of the conveying portion 1, and ink or varnish is imprinted onto the base material that is conveyed by the conveying portion 1 and is to be printed, to form a semi-finished product. In the embodiment, the base material to be printed is paper, while a person of ordinary skills in the art can understand that the base material can further be a sheet material such as a plastic sheet and a metal sheet. The optically variable pattern on the surface of the semi-finished product comprises a first region and a second region, and the two regions at least do not overlap each other partially.

[0016] The first optical-color optically variable pattern forming unit 3 is in the next procedure of the silk-screen printing unit 2, and a first optical-color optically variable pattern is formed on the first region of the semi-finished product. The second optical-color optically variable pattern forming unit 4 is in the next procedure of the first optical-color optically variable pattern forming unit 3, and a second optical-color optically variable pattern is formed on the second region of the semi-finished product, therefore, the first optical-color optically variable pattern is formed on the first region of the semi-finished product, the second optical-color optically variable pattern is formed on the second region of the semi-finished product, and the first region and the second region do not overlap each completely.

[0017] In the present disclosure, the principle of forming the first optical-color optically variable pattern and the second optical-color optically variable pattern is a principle of forming a certain included angle between an OVMP pigment sheet 12 in a printing ink and a base material 13 (in combination with FIG. 8). Before the pre-curing, curing or natural penetration drying of the OVMP pigment sheet 12 in an optically variable magnetic printing ink, the magnetic orientation effect to the OVMP pigment sheet 12 is always effective, and therefore, two or multiple magnetic orientations can be conducted during this period, and then a multi-optical-color optically variable technology with more than two effects can be achieved for the same silk-screen printing pattern.

[0018] As shown in FIG. 2, the first optical-color optically variable pattern forming unit 3 comprises a first magnetic orientation unit 31, a pre-drying and curing adjusting apparatus 32 and a first pre-drying and curing unit 33. The first magnetic orientation unit 31 and the first pre-drying and curing unit 33 are spaced by a preset distance and are provided opposite to each other, the pre-drying and curing adjusting apparatus 32 is provided between the first magnetic orientation unit 31 and the first pre-drying and curing unit 33, and the pre-drying and curing adjusting apparatus 32 and the first magnetic orientation unit 31 allow a sheet shape semi-finished product to pass therebetween. The first magnetic orientation unit 31 is in the next procedure of the silk-screen printing unit 2, and after subjected to the process in the silk-screen printing unit 2, the semi-finished product is conveyed to the first magnetic orientation unit 31, and the first magnetic orientation unit 31 conducts magnetic orientation to the semi-finished product. The first pre-drying and curing unit 33 conducts pre-drying and curing to the first region of the semi-finished product through the pre-drying and curing adjusting apparatus 32, and then a first optically variable product is formed. A first optical-color optically variable effect appears in the first region subjected to drying and curing.

[0019] As shown in FIG. 3a, the pre-drying and curing adjusting apparatus 32 comprises a light shield 321 and a light shielding region adjusting mechanism 322. The light shield 321 extends along a long axis direction of the first magnetic orientation unit 31 (that is, the longitudinal length direction of the light shield 321 is parallel to the long axis direction of the first magnetic orientation unit 31), and the light shield 321 is provided with multiple windows 323, and the windows 323 correspond to the a magnetic orientation region 311 (referring to FIG. 2) of the first magnetic orientation unit 31. The light shielding region adjusting mechanism 322 is provided on the windows 323, and is configured to adjust a light transmission region of the windows 323.

[0020] The light shielding region adjusting mechanism 322 adjusts the light transmission region of the windows 323 through moving between a first position and a second position, and the light transmission region of the windows 323 when the light shielding region adjusting mechanism 322 is at the first position is different from the light transmission region of the windows 323 when the light shielding region adjusting mechanism 322 is at the second position.

[0021] As shown in FIG. 3b, the light shielding region adjusting mechanism 322 comprises a window light shield 3221, two light shield guide rails 3222, two adjusting screws 3223, two locking nuts 3224 and multiple set screws (not shown). In an embodiment, the window light shield 3221 is inserted between the two light shield guide rails 3222, and can cooperate with the screw holes 3225 in the two sides of the light shield guide rails 3222 through the set screws (not shown) and then is fixed on the light shield guide rails 3222. The size and the shape of the window light shield 3221 match the size and the shape of the magnetic orientation region 311 and / or the windows 323, to totally shield the magnetic orientation region 311 and / or the windows 323. The light shield guide rails 3222 slide along the longitudinal length direction of the light shield 321 to guide the sliding of the window light shield 3221.

[0022] The two adjusting screws 3223 are respectively fixed on the two vertexes of the window light shield 3221, and are respectively located at one side of the light shield guide rails 3222; and the locking nut 3224 is sleeved on the adjusting screws 3223, and is used for fixing the adjusting screws 3223.

[0023] In addition, a reinforcing rib 324 is further provided surrounding the periphery of the light shield 321, to improve the strength of the light shield 321.

[0024] As shown in FIG. 4, the above first optical-color optically variable pattern forming unit 3 can further comprise the first magnetic orientation unit 31, two pre-drying and curing adjusting apparatuses 32 and the first pre-drying and curing unit 33. The first magnetic orientation unit 31 and the first pre-drying and curing unit 33 are spaced by a preset distance and are provided opposite to each other, the two pre-drying and curing adjusting apparatuses 32 are provided between the first magnetic orientation unit 31 and the first pre-drying and curing unit 33, and the pre-drying and curing adjusting apparatus 32 close to the first magnetic orientation unit 31 and the first magnetic orientation unit 31 allow a sheet shape semi-finished product to pass therebetween. The first magnetic orientation unit 31 is in the next procedure of the silk-screen printing unit 2, and after subjected to the process in the silk-screen printing unit 2, the semi-finished product is conveyed to the first magnetic orientation unit 31, and the first magnetic orientation unit 31 conducts magnetic orientation to the semi-finished product. The first pre-drying and curing unit 33 conducts pre-drying and curing to the first region of the semi-finished product through the pre-drying and curing adjusting apparatuses 32, and then a first optically variable product is formed. A first optical-color optically variable effect appears in the first region subjected to drying and curing. In this embodiment, only two pre-drying and curing adjusting apparatuses 32 are provided, however, in actual application, the number of the pre-drying and curing adjusting apparatuses 32 can be set at random according to actual needs.

[0025] Besides the structure of the above first optical-color optically variable pattern forming unit 3, as an alternative solution, the present disclosure further provides the structure of another first optical-color optically variable pattern forming unit 3. The structure of the second type of the first optical-color optically variable pattern forming unit 3 will be detailed hereinafter.

[0026] As shown in FIG. 5, the first optical-color optically variable pattern forming unit 3 comprises the first magnetic orientation unit 31 and a split type pre-drying and curing mechanism 34. The first magnetic orientation unit 31 and the split type pre-drying and curing mechanism 34 are spaced by a preset distance and are provided opposite to each other. The first magnetic orientation unit 31 is in the next procedure of the silk-screen printing unit 2, and conducts magnetic orientation to the semi-finished product. The split type pre-drying and curing mechanism 34 conducts pre-drying and curing to the first region of the semi-finished product, and then a first optically variable product is formed. The first optical-color optically variable effect can further be obtained.

[0027] As shown in FIG. 6, the split type pre-drying and curing mechanism 34 comprises a fixing beam 314, a motor 342, a motor guide rail 343, a fixing beam guide rail 344, a curing apparatus 345 and a side baffle 346. In an embodiment, the fixing beam 341 extends along the long axis direction of the first magnetic orientation unit 31, and comprises a transverse plate 3411 and a vertical plate 3412, and the transverse plate 3411 is perpendicularly connected to the vertical plate 3412.

[0028] The motor 342 is provided on the transverse plate 3411, the motor guide rail 343 is provided on the motor 342, and multiple curing apparatuses 345 are connected to the motor guide rail 343 at a fixed interval; the fixing beam guide rail 344 is provided on the vertical plate 3412, and the curing apparatuses 345 are connected to the motor guide rail 343; the side baffles 346 are provided at one side edge or double side edges of the curing apparatuses 345, and are configured to shield the curing regions of the curing apparatuses 345, to prevent the interference between adjacent curing apparatuses 345 and help achieve the "stitching" of the first region and the second region of the same pattern. Through the first optical-color optically variable pattern forming unit 3 of the above structure, after the first optical-color optically variable effect is formed on the first region of a pattern, another optical-color optically variable effect is formed on the second region of the same pattern through the following second optical-color optically variable pattern forming unit 4, and thus a multi-optical-color optically variable effect is formed in the same pattern, that is, the first region and the second region of one pattern have different optical-color optically variable effects.

[0029] As shown in FIG. 7, the second optical-color optically variable pattern forming unit 4 comprises a second magnetic orientation unit 41 and a second pre-drying and curing unit 42. The second magnetic orientation unit 41 is in the next procedure of the first optical-color optically variable pattern forming unit 3, and conducts magnetic orientation to the second region of the first optically variable product. The second pre-drying and curing unit 42 and the second magnetic orientation unit 41 are spaced by a preset distance, and the second pre-drying and curing unit 42 dries and cures the second region of the second region of the first optically variable product, and then a second optically variable product is formed. The region that can be cured by the second pre-drying and curing unit 42 can cover the whole product, comprising the first region and the second region of the semi-finished product, and can further only cover the second region. In an embodiment, the light emitting length of the second pre-drying and curing unit 42 is equivalent to the axial length of the second magnetic orientation unit 41, to cure the whole product. In other words, the first pre-drying and curing unit corresponds to the first region, to conduct pre-drying and curing; and the second pre-drying and curing unit correspond to the first region and the second region.

[0030] In addition, the multi-optical-color optically variable printing apparatus provided by the present disclosure further comprises a drying and curing unit 6, which is provided behind the second optical-color optically variable pattern forming unit 4 (as shown in FIG. 1), and conducts drying and curing to the second optically variable product.

[0031] Besides the above multi-optical-color printing apparatus, the present disclosure further provides another multi-optical-color optically variable printing apparatus. As shown in FIG. 9, the multi-optical-color optically variable printing apparatus further comprises a rearrangement magnetizing apparatus 7, and the rearrangement magnetizing apparatus 7 is provided between the silk-screen printing unit 2 and the first optical-color optically variable pattern forming unit 3, and between the first optical-color optically variable pattern forming unit 3 and the second optical-color optically variable pattern forming unit 4. In this embodiment, there are two rearrangement magnetizing apparatuses 7, i.e., a first rearrangement magnetizing apparatus 7 and a second rearrangement magnetizing apparatus 7. The position design of the above rearrangement magnetizing apparatus 7 renders that a base body to be printed can only enter the first optical-color optically variable pattern forming unit 3 after it travels to the first rearrangement magnetizing apparatus 7 from the silk-screen printing unit 2, and passes the second rearrangement magnetizing apparatus 7 from the first optical-color optically variable pattern forming unit 3 and then can enter the second optical-color optically variable pattern forming unit 4. When a printing ink or varnish is printed on the base body to be printed, the magnetic pigment sheets therein present a disordered and irregular arrangement, when such a base body to be printed is conveyed to the rearrangement magnetizing apparatus 7, the magnetic pigment sheets are rearranged according to a certain law, in an embodiment, they are arranged parallel to the base body to be printed, thus the consistency of the magnetization orientation is improved when the magnetic pigment sheets pass the first magnetic orientation unit 31 and the second magnetic orientation unit 41, and the optical-color optically variable effect is brighter. Except this, the structures and the principles of the other portions are the same with the first multi-optical-color optically variable printing apparatus and are not repeated. In this embodiment, there are two rearrangement magnetizing apparatuses 7, during specific implementations, the number of the rearrangement magnetizing apparatuses can be set correspondingly according to the number of the optical-color optically variable pattern forming units, which is not be repeated herein.

[0032] The present disclosure further provides a multi-optical-color optically variable effect printing method, and the multi-optical-color optically variable effect printing method uses the above multi-optical-color optically variable printing apparatus. In an embodiment, two groups of optical-color optically variable pattern forming units are used as an example, and S 1, printing ink or varnish is imprinted onto a base material to be printed to form a semi-finished product;S2, the semi-finished product is conveyed to a first optical-color optically variable pattern forming unit, when a portion of the printing ink or varnish of the semi-finished product is magnetized and positioned, a portion of magnetized printing ink or varnish is subjected to pre-drying and curing through a first pre-drying and curing unit, and then a first optically variable product is formed; S3, the first optically variable product after the step S2 is completed is conveyed to a second optical-color optically variable pattern forming unit, a second region on the first optically variable product not subjected to the pre-drying and curing in step S2 is magnetized and positioned and is subjected to pre-drying and curing at the same time, and then a second optically variable product is formed; and S4, the second optically variable product subjected to at least two magnetization and pre-drying and curing is conveyed to a drying and curing unit for drying and curing, to form a final product.

[0033] To sum up, compared with the prior art, the present disclosure provides a pre-drying and curing adjusting apparatus, a multi-optical-color optically variable printing apparatus and a printing method, through providing magnetic orientation units of different magnetic field effects and an adjustable pre-drying and curing mechanism, multiple optical-color optically variable (multi-optical-color optically variable) effects are respectively achieved for the multiple regions of the same silk-screen printing pattern, and a stitching technology of multiple effect patterns can further be achieved. The multiple effects can be as follows: 1, multiple scrolling effects under the effect of a single magnetic field; 2, multiple Motion effects under the effect of a compound magnetic field; and 3, a scrolling effect under the effect of a single magnetic field and a Motion effect under the effect of a compound magnetic field.

[0034] The present disclosure is detailed above. For a person of ordinary skills in the art, any obvious modification to the present disclosure without departing from the substantive contents of the present disclosure will constitute infringement on the patent rights of the present disclosure, and corresponding legal liabilities shall be born.

Claims

1. A multi-optical-color optically variable printing apparatus, wherein, the multi-optical-color optically variable printing apparatus comprises a conveying portion, a silk-screen printing unit, a first optical-color optically variable pattern forming unit, a second optical-color optically variable pattern forming unit and a transmission system, the conveying portion is used for conveying a base material to be printed; the silk-screen printing unit is in the next procedure of the conveying portion, and is used for imprinting a printing ink or varnish onto the base material that is conveyed by the conveying portion and is to be printed, to form a semi-finished product; the first optical-color optically variable pattern forming unit is in the next procedure of the silk-screen printing unit, and is used for forming a first optical-color optically variable pattern on a first region of the semi-finished product; the second optical-color optically variable pattern forming unit is in the next procedure of the first optical-color optically variable pattern forming unit, and is used for forming a second optical-color optically variable pattern on a second region of the semi-finished product; and the transmission system comprises multiple conveying rollers for conveying the base material to be printed.

2. The multi-optical-color optically variable printing apparatus according to claim 1, wherein, the first optical-color optically variable pattern forming unit comprises a first magnetic orientation unit and a first pre-drying and curing unit; the first magnetic orientation unit and the first pre-drying and curing unit are spaced by a preset distance and are provided opposite to each other; the first magnetic orientation unit is configured to conduct magnetic orientation to the first region of the semi-finished product; and the first pre-drying and curing unit is configured to dry and cure the first region.

3. The multi-optical-color optically variable printing apparatus according to claim 2, wherein, the first optical-color optically variable pattern forming unit further comprises a pre-drying and curing adjusting apparatus, and the pre-drying and curing adjusting apparatus comprises a light shield and a light shielding region adjusting mechanism; the light shield extends along a long axis direction of the first magnetic orientation unit, the light shield is provided with multiple windows, and the windows correspond to a magnetic orientation region of the first magnetic orientation unit; and the light shielding region adjusting mechanism is provided on the windows, and is configured to adjust a light transmission region of the windows.

4. The multi-optical-color optically variable printing apparatus according to claim 3, wherein, the light shielding region adjusting mechanism adjusts the light transmission region of the windows through moving between a first position and a second position; and the light transmission region of the windows when the light shielding region adjusting mechanism is at the first position is different from the light transmission region of the windows when the light shielding region adjusting mechanism is at the second position.

5. The multi-optical-color optically variable printing apparatus according to claim 2, wherein, the first optical-color optically variable pattern forming unit further comprises a split type pre-drying and curing mechanism, and the split type pre-drying and curing mechanism comprises a fixing beam, a motor and a curing apparatus; the fixing beam extends along the long axis direction of the first magnetic orientation unit; and the curing apparatus is mounted on the fixing beam, and is able to move along the fixing beam under the driving of the motor.

6. The multi-optical-color optically variable printing apparatus according to claim 5, wherein, the split type pre-drying and curing mechanism further comprises a side baffle, and the side baffle is provided at the side edge of the curing apparatus and is configured to shield the light of the curing apparatus.

7. The multi-optical-color optically variable printing apparatus according to any of claims 1 to 6, wherein, the second optical-color optically variable pattern forming unit comprises a second magnetic orientation unit and a second pre-drying and curing unit; the second magnetic orientation unit is configured to conduct magnetic orientation to the second region of the semi-finished product; and the second pre-drying and curing unit and the second magnetic orientation unit are spaced by a preset distance, and the second pre-drying and curing unit dries and cures the second region.

8. The multi-optical-color optically variable printing apparatus according to claim 7, wherein, the first pre-drying and curing unit corresponds to the first region to conduct pre-drying and curing; and the second pre-drying and curing unit corresponds to the first region and the second region.

9. The multi-optical-color optically variable printing apparatus according to claim 8, further comprising a rearrangement magnetizing apparatus, wherein, the rearrangement magnetizing apparatus is provided between the silk-screen printing unit and the first optical-color optically variable pattern forming unit, and between the first optical-color optically variable pattern forming unit and the second optical-color optically variable pattern forming unit.

10. A multi-optical-color optically variable effect printing method, wherein, the multi-optical-color optically variable effect printing method uses the multi-optical-color optically variable printing apparatus according to any of claims 1 to 9, and comprises following steps: S1, imprinting a printing ink or varnish onto a base material to be printed to form a semi-finished product; S2, sequentially conveying the semi-finished product to a first optical-color optically variable pattern forming unit, conducting pre-drying and curing to a first region through a first pre-drying and curing unit while the first region of the semi-finished product is magnetized and positioned, and then forming a first optically variable product; S3, conveying the first optically variable product after the step S2 is completed to a second optical-color optically variable pattern forming unit, conducting pre-drying and curing while the second region of the semi-finished product is magnetized and positioned, and then forming a second optically variable product; and S4, conveying the second optically variable product to a drying and curing unit for drying and curing, and then forming a final product.

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