A printing process for anti-counterfeiting aluminum-plated laser film

Abstract

The present invention discloses a printing process for anti-counterfeiting aluminum-plated laser film, which belongs to the technical field of packaging material printing. The process includes: plasma pretreatment of bio-based degradable polyester film to enhance adhesion, coating of temperature-sensitive color-changing layer to achieve temperature-responsive anti-counterfeiting, forming a diffraction grating structure by laser embossing, gradient vapor-deposited aluminum layer to construct annular reflective difference band, and finally coating a degradable protective layer containing plant extracts. The present invention realizes the multi-level anti-counterfeiting function and green production of the anti-counterfeiting film by optimizing process design and applying environmentally friendly materials. The temperature-sensitive color-changing layer presents dynamic color changes at different temperatures, and the annular reflective difference formed by the gradient aluminum layer significantly improves the complexity and reliability of anti-counterfeiting identification. The use of bio-based degradable materials and plant-extracted protective layers gives the product natural degradable characteristics, reducing the environmental burden. In addition, the use of cooling equipment is optimized in the printing process to ensure the uniformity and structural stability of the aluminum-plated layer.

Description

Technical Field

[0001] The invention relates to the technical field of packaging material printing, in particular to a printing process of an anti-counterfeiting aluminized laser film. Background Art

[0002] Laser anti-counterfeiting labels are often used on cigarette boxes, wine boxes and high-end gift papers to improve the anti-counterfeiting level of their products. Traditional anti-counterfeiting film production processes mostly rely on single static anti-counterfeiting features, such as fixed laser graphics or printed patterns, which are easy to imitate and lack interactive verification capabilities.

[0003] At present, Chinese patent application number: CN201710253405.X discloses a method for printing laser holographic anti-counterfeiting labels, including: printing laser film, coating, compounding, drying and curing, and positioning printing; also discloses a device for printing laser holographic anti-counterfeiting labels, including: a frame, a first unwinding unit, a second unwinding unit, a coating unit, a compounding unit, a drying and curing unit, and a printing unit.

[0004] However, in the existing technology, the function of the anti-counterfeiting layer is relatively simple, and it is not easy to achieve multi-dimensional anti-counterfeiting effects such as temperature response and optical gradient; the base material mostly uses non-degradable petroleum-based films, and the production process involves solvent-based inks and high-energy consumption processes, which poses environmental pollution problems; in addition, the microcracks and uneven thickness of the aluminum layer caused by the accumulation of thermal stress in the aluminum plating process affect the product yield and anti-counterfeiting effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a printing process for anti-counterfeiting aluminum-plated laser film to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: a printing process of an anti-counterfeiting aluminum-plated laser film, comprising the following steps:

[0007] (a) A temperature-sensitive color-changing layer is coated on the surface of a biodegradable polyester film. The layer is composed of a mixture of cholesteric liquid crystal and acrylic resin in a ratio of 1:4-6, forming a dynamic anti-counterfeiting layer with color changing in the range of 30-50°C;

[0008] (b) Laser embossing and pattern printing are completed by a printing press to form a composite layer with both diffraction gratings and color graphics;

[0009] (c) After embossing and printing, cooling equipment is used to eliminate thermal stress and reduce the generation of microcracks;

[0010] (d) After cooling, a gradient aluminum layer is deposited on the surface of the composite layer, with the thickness gradually changing from 25 nm in the center to 45 nm in the edge, forming an annular reflective differential band;

[0011] (e) Coating a protective layer containing plant-derived antioxidants that releases fluorescent markers during natural degradation.

[0012] Preferably, the surface of the bio-based degradable polyester film is pretreated by plasma with a treatment power of 50-100 W and a treatment time of 30-60 seconds, and the surface tension reaches 38-42 mN / m.

[0013] Preferably, the gradient aluminum layer in step (d) is deposited by a magnetron sputtering coating machine, and the aluminum deposition gradient is controlled by moving the mask plate, and the aperture ratio of the mask plate decreases linearly from 80% in the center to 30% at the edge.

[0014] Preferably, the protective layer in step (e) contains 5-8% by mass of sodium copper chlorophyllin, which exhibits red fluorescence under 365nm ultraviolet light when degraded.

[0015] Preferably, the cooling device in step (c) reduces the base film temperature to below 40° C. after treatment, thereby improving the thickness gradient linearity of the magnetron sputtered aluminum layer.

[0016] Preferably, the cooling device includes a base frame, a silo cover is fastened to the top side of the base frame, and the silo cover is fastened to the four sides of the top of the silo cover, and a water-cooled roller, a nitrogen bellows mechanism, a first suspension roller and a second suspension roller are sequentially arranged inside the silo cover from left to right, the top of the nitrogen bellows mechanism is arranged through the inside of the silo cover, two groups of first suspension rollers are provided and are located on the same vertical plane, and the first suspension roller and the second suspension roller located on the bottom side are on the same horizontal plane, the outer surfaces of the first suspension roller and the second suspension roller are both provided with air ports, and the first suspension roller and The interior of the second suspension roller is connected to the external gas end, so as to allow the air flow to be blown out through the air ports of the first suspension roller and the second suspension roller; the nitrogen bellows mechanism includes a frame seat fastened to the silo cover on the left and right sides, a nitrogen air curtain body embedded in the top side of the frame seat, an air outlet arranged on the upper middle side of the frame seat, an air inlet arranged on the lower side of the frame seat, and a supporting structure fastened to the bottom side of the frame seat. The top side of the nitrogen air curtain body is embedded in the inner side of the silo cover, the top side of the air inlet is connected to the nitrogen air curtain body, and through-holes for the base film to pass through are opened on the left and right sides of the frame seat.

[0017] Preferably, the support structure includes a vertical plate whose bottom side is fastened to the frame seat, a lifting assembly connected to the bottom side of the front of the vertical plate, a first motor fastened to the left side of the top of the lifting assembly, a transmission belt body connected to the rear output end of the first motor, and a pushing assembly connected to the right side of the rear of the transmission belt body, the transmission belt body includes two transmission pulleys and a transmission belt, the transmission pulley on the left side is connected to the rear output end of the first motor, the rear middle side of the transmission pulley on the right side is connected to the pushing assembly, and the front middle side of the transmission pulley on the right side is rotatably connected to the lifting assembly, the bottom side of the front of the pushing assembly is fixed to the lifting assembly, an arc groove is opened on the upper right side of the interior of the vertical plate, and the front of the pushing assembly is arranged through the inner side of the arc groove.

[0018] The top of the driving mechanism can be rotated by the guide rail, and the bottom of the driving mechanism can be rotated by the guide rail, and the top of the driving mechanism can be rotated by the guide rail, and the bottom of the driving mechanism can be rotated by the guide rail.

[0019] The cam is fixed to the front of the lifting assembly, and the cam is fixed to the rear of the lifting assembly, and the cam is fixed to the front of the lifting assembly. The cam is fixed to the front of the lifting assembly, and the cam is fixed to the front of the lifting assembly. The cam is fixed to the front of the lifting assembly, and the cam is fixed to the front of the lifting assembly. The cam is fixed to the front of the lifting assembly, and the cam is fixed to the front of the lifting assembly. The cam is fixed to the front of the lifting assembly, and the cam is fixed to the front of the lifting assembly. The cam is fixed to the front of the lifting assembly

[0020] Preferably, the first remote control arm and the second rocker arm have the same structure and size, and are located in the middle of the rectangular frame and are symmetrically arranged on the left and right. The first support roller and the second support roller have the same structure and size, and are both elliptical structures with a high middle and low ends.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention achieves multi-level anti-counterfeiting function and green production of the anti-counterfeiting film by optimizing process design and applying environmentally friendly materials. The temperature-sensitive color-changing layer exhibits dynamic color changes at different temperatures, and the annular reflection difference formed by the gradient aluminum layer significantly improves the complexity and reliability of anti-counterfeiting identification; the use of bio-based degradable materials and plant-extracted protective layers gives the product naturally degradable properties, reducing the environmental burden; and the cooling equipment optimized for use in the printing process can effectively eliminate thermal stress, ensure the uniformity and structural stability of the aluminum-plated layer, and provide technical support for the production of high-quality anti-counterfeiting films.

[0023] The water-cooling roller of the cooling equipment of the present invention is equipped with ethylene glycol circulating liquid to perform contact-type rapid cooling with the base film, stably reducing the temperature of the back of the base film from 80°C to 50°C, and vertically blowing clean nitrogen through a nitrogen bellows mechanism to perform synchronous cooling and remove residual ozone and dust on the surface of the base film. After the nitrogen blowing, the base film is suspended by a non-contact air cushion through the first suspension roller and the second suspension roller to further reduce the temperature of the base film, thereby improving the cooling efficiency of the base film.

[0024] The top side of the air inlet of the nitrogen bellows mechanism of the present invention is connected to the nitrogen air curtain body to recycle the nitrogen. The nitrogen generated by the nitrogen air curtain body is blown vertically onto the base membrane through the air inlet, which plays the role of cooling, dust removal and ozone removal. In addition, the base membrane can be lifted up and guided to be flat through the supporting structure to increase the effective heat dissipation area of the base membrane, so that turbulence is generated inside the frame seat to improve the heat exchange effect.

[0025] The present invention controls the forward and reverse rotation of the first motor so that the column drives the first remote control rod to perform a reciprocating left and right swinging action. When the first remote control rod swings left and right, the first L-shaped rod causes the indexing seat to rotate above the rectangular frame. Under the action of the indexing seat, the second L-shaped rod drives the second rocking rod to perform a swinging action in the opposite direction to the first remote control rod, so that the first roller and the second roller scrape and flatten the base film on the front and back sides below the base film, so that different curvature curves are formed on the front and back sides of the base film, so as to facilitate the flattening of the base film and generate turbulence in the gas blown toward the base film, thereby improving the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the printing process of the anti-counterfeiting aluminum-plated laser film of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the cooling device of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the connection between the bin cover and the nitrogen bellows mechanism of the present invention;

[0029] Figure 4It is a structural schematic diagram of the support structure of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the jacking assembly of the present invention;

[0031] Figure 6 It is a structural schematic diagram of the delay assembly of the present invention;

[0032] Figure 7 For the present invention Figure 6 Schematic diagram of the left view structure;

[0033] Figure 8 It is a structural schematic diagram of the connection between the indexing seat and the rectangular frame of the present invention.

[0034] In the figure: base frame 1, bin cover 2, bin lid 3, water-cooled roller 4, nitrogen bellows mechanism 5, first suspension roller 6, second suspension roller 7, frame 51, nitrogen air curtain body 52, air outlet 53, air inlet 54, support structure 55, vertical plate 551, lifting assembly 552, first motor 553, transmission belt body 554, extension assembly 555, arc groove 5511, support frame 5521, second motor 5522, Slide shaft 5523, bearing block 5524, slider 5525, shift block 5526, push rod 5527, plate carrier 5528, bracket 5550, rectangular frame 5551, column 5552, first remote control rod 5553, first roller 5554, first L-shaped rod 5555, transfer seat 5556, second L-shaped rod 5557, second rocker 5558, second roller 5559, support column 55510. DETAILED DESCRIPTION

[0035] In order to further explain the technical solution of the present invention, specific embodiments are described in detail below.

[0036] See also Figure 1 The present invention provides a printing process for an anti-counterfeiting aluminum-plated laser film, comprising the following steps:

[0037] (a) The surface of the bio-based degradable polyester film is pre-treated with plasma at a power of 80 W for 60 seconds, achieving a surface tension of 40 mN / m. A temperature-sensitive color-changing layer is then coated on the surface of the bio-based degradable polyester film. The layer is composed of a mixture of cholesteric liquid crystal and acrylic resin in a ratio of 1:4-6 to form a dynamic spiral periodic structure, thereby forming a dynamic anti-counterfeiting layer with color changes in the range of 30-50°C, which can achieve temperature-responsive anti-counterfeiting that is discernible to the naked eye.

[0038] (b) Laser embossing and pattern printing are completed by a printing press to form a composite layer with both diffraction gratings and color graphics;

[0039] (c) After embossing and printing, the base film is cooled using a cooling device to reduce the base film temperature to below 40°C to eliminate thermal stress and reduce the generation of microcracks, thereby improving the thickness gradient linearity of the magnetron sputtered aluminum layer.

[0040] (d) After cooling, a gradient aluminum layer is deposited on the surface of the composite layer. The gradient aluminum layer is deposited using a magnetron sputtering coating machine. The aluminum deposition gradient is controlled by moving the mask. The aperture of the mask decreases linearly from 80% in the center to 30% at the edge, and the thickness gradually changes from 25 nm in the center to 45 nm at the edge, forming an annular reflective difference band to increase the reflectivity difference.

[0041] (e) A protective layer containing plant-extracted antioxidants is applied to retard the oxidation of the aluminum layer and extend its life. The protective layer contains 5-8% by mass of sodium copper chlorophyllin, which exhibits red fluorescence under 365nm ultraviolet light when degraded. The layer releases fluorescent markers during natural degradation, achieving environmentally friendly, traceable and anti-counterfeiting capabilities.

[0042] See also Figures 1-8The present invention provides a printing process for anti-counterfeiting aluminum-plated laser film. In the printing process, a cooling device is optimized and used. The cooling device includes a base frame 1, a bin cover 2 is fastened to the top side of the base frame 1, and a bin cover 3 is fastened to the four sides of the top of the bin cover 2. A water-cooled roller 4, a nitrogen bellows mechanism 5, a first suspension roller 6 and a second suspension roller 7 are sequentially arranged from left to right inside the bin cover 2. The top of the nitrogen bellows mechanism 5 is arranged through the inner side of the bin cover 3. Two groups of first suspension rollers 6 are provided and are located on the same vertical plane, and the first suspension roller 6 and the second suspension roller 7 located on the bottom side are on the same horizontal plane. Air ports are opened on the outer surfaces of the first suspension roller 6 and the second suspension roller 7, and the interiors of the first suspension roller 6 and the second suspension roller 7 are connected to the external gas end, so as to allow airflow to be blown out through the air ports of the first suspension roller 6 and the second suspension roller 7. The water-cooled roller 4 has ethylene glycol circulating liquid built in it, which performs contact-type rapid cooling with the base film, stably reducing the back side of the base film from 80°C to 50°C, and the clean nitrogen is ventilated by the nitrogen bellows mechanism 5. The nitrogen bellows mechanism 5 comprises a frame 51 fastened to the hopper cover 2 on both sides, a nitrogen air curtain body 52 embedded in the top side of the frame 51, an air outlet 53 arranged on the upper middle side of the frame 51, an air inlet 54 arranged on the lower side of the frame 51, and a support fastened to the bottom side of the frame 51. Structure 55, the top side of the nitrogen air curtain body 52 is embedded in the inner side of the bin cover 3, and the top side of the air inlet 54 is connected to the nitrogen air curtain body 52 to recycle the nitrogen. The left and right sides of the frame seat 51 are provided with through-holes for the base membrane to pass through. The nitrogen is blown vertically onto the base membrane through the air inlet 54, which plays the role of cooling, dust removal and ozone removal, and the base membrane can be lifted up and guided to be flat through the supporting structure 55 to increase the effective heat dissipation area of the base membrane, so that turbulence is generated inside the frame seat 51 to improve the heat exchange effect.

[0043] The support structure 55 includes a vertical plate 551 fastened to the frame seat 51 on the bottom side, a lifting assembly 552 connected to the bottom side of the front of the vertical plate 551, a first motor 553 fastened to the left side of the top of the lifting assembly 552, a transmission belt body 554 connected to the rear output end of the first motor 553, and a delay assembly 555 connected to the right side of the rear of the transmission belt body 554. The transmission belt body 554 includes two transmission pulleys and a transmission belt. The transmission pulley on the left is connected to the rear output end of the first motor 553, the middle side of the rear of the transmission pulley on the right is connected to the delay assembly 555, and the front of the transmission pulley on the right is connected to the delay assembly 555. The middle side is rotatably connected to the lifting component 552, and the two transmission pulleys rotate synchronously under the action of the first motor 553. The bottom side of the front part of the pushing component 555 is fixed to the lifting component 552. An arc groove 5511 is provided on the upper right side of the vertical plate 551, and the front part of the pushing component 555 is arranged through the inner side of the arc groove 5511. Under the action of the lifting component 552, the pushing component 555 moves back and forth in an arc trajectory inside the arc groove 5511, so that the pushing component 555 drives the base membrane to move back and forth, so that turbulence is generated inside the frame seat 51 and the effective heat dissipation area of the base membrane is increased, thereby improving the heat dissipation effect.

[0044] The lifting assembly 552 includes a support frame 5521 fastened to the vertical plate 551 at the bottom of the rear side, a second motor 5522 locked and fixed to the right part of the top side of the support frame 5521, a slide shaft 5523 connected to the left output end of the second motor 5522, bearing blocks 5524 wrapped around the left and right sides of the slide shaft 5523, a slider 5525 slidably connected to the top side of the slide shaft 5523, a shift block 5526 fixed to the top side of the slider 5525, a push rod 5527 rotatably connected to the top side of the shift block 5526, and a plate carrier 5528 rotatably connected to the top end of the push rod 5527. The left side of the plate carrier 5528 is rotatably connected to the support frame 5521, the left side of the top of the plate carrier 5528 is fastened to the first motor 553, and the plate carrier The right side of the top of 5528 is rotatably connected to the transmission pulley on the right side, the bottom of the bearing block 5524 is fixed to the pad frame 5521, and two connected spiral grooves are provided on the outer surface of the slide shaft 5523. The second motor 5522 is used as the power source. The cooperation between the slide shaft 5523 and the slider 5525 enables the shift block 5526 to perform a horizontal reciprocating shift action, so that the push rod 5527 drives the carrier frame 5528 to perform an arc trajectory motion up and down with the left side of the top of the pad frame 5521 as the base point. Circular openings are provided on both sides of the shift block 5526, and the bottom of the shift block 5526 is horizontally slidably connected to the pad frame 5521. The slide shaft 5523 is arranged inside the circular opening to ensure the stability of the horizontal shift of the shift block 5526.

[0045] The delay assembly 555 includes a bracket 5550 fixed to the lifting assembly 552 on the front side, a rectangular frame 5551 integrally formed on the rear side of the bracket 5550, so that the rectangular frame 5551 can be synchronously shifted up and down in an arc trajectory under the action of the lifting assembly 552, a first remote control rod 5553 set on the front middle side of the rectangular frame 5551, a column rod 5552 fixed to the front bottom side of the first remote control rod 5553, a first roller 5554 rotatably connected to the top of the front side of the first remote control rod 5553, a first L-shaped rod 5555 running through and rotating on the front middle and lower side of the first remote control rod 5553, and a first L-shaped rod 5556 rotatably connected to the first L-shaped rod 5557. 55, a rotation seat 5556 on the rear bottom side of the rotation seat 5556, a second L-shaped rod 5557 that rotates through the rear side of the rotation seat 5556, a second rocker 5558 that is rotatably connected to the rear of the second L-shaped rod 5557, a second roller 5559 that is rotatably set on the top of the rear side of the second rocker 5558, and a support column 55510 that is rotatably connected to the front bottom side of the second rocker 5558. The support column 55510 is used as a fulcrum to facilitate the rotation of the second rocker 5558. The front end of the column 5552 is connected to the middle part of the transmission pulley on the right side, so that the column 5552 drives the first remote control rod 5553 to rotate through the transmission pulley on the right side. The first and second rocker arms 5558 are symmetrically arranged in the middle of the rectangular frame 5551. The first roller 5554 and the second roller 5559 are symmetrically arranged in the middle of the rectangular frame 5551. The first and second rocker arms 5553 are symmetrically arranged in the middle of the rectangular frame 5551. The first and second rollers 5554 and 5559 are symmetrically arranged in the middle of the rectangular frame 5551. The first and second rollers 5554 and 5559 are ellipsoidal structures with a high middle and low ends. The first motor 553 is controlled to rotate in the forward and reverse directions. The column rod 5552 drives the first remote control rod 5553 to perform a reciprocating left and right positioning movement. When the first remote control rod 5553 swings left and right, the first L-shaped rod 5555 causes the index seat 5556 to rotate above the rectangular frame 5551. Under the action of the index seat 5556, the second L-shaped rod 5557 drives the second rocker rod 5558 to perform a positioning movement in the opposite direction of the first remote control rod 5553, so that the first roller 5554 and the second roller 5559 scrape and flatten the base film on the front and back sides below the base film, so that different curvature curves are formed on the front and back sides of the base film, so as to facilitate the flattening of the base film and generate turbulence in the gas blown to the base film, thereby improving the cooling effect.

[0046] The present invention provides a printing process for an anti-counterfeiting aluminum-plated laser film. The working principle of the cooling device used in the printing process is as follows:

[0047] First, after printing the composite layer on the bio-based degradable polyester film, with the composite layer facing upward, the bio-based degradable polyester film is sequentially passed through and contacted with the top of the water-cooled roller 4, the top of the first support roller 5554 and the second support roller 5559, and the inside of the two first suspension rollers 6 and the top of the second suspension roller 7;

[0048] Second, the bottom side of the bio-based degradable polyester film contacts the water-cooled roller 4 with built-in ethylene glycol circulating fluid, and the bio-based degradable polyester film is subjected to contact-type rapid cooling, so that the back side of the base film is stably cooled from 80°C to 5°C;

[0049] Third, the base film enters the interior of the frame seat 51, and the nitrogen air curtain body 52 generates nitrogen and blows the nitrogen vertically onto the base film above the first roller 5554 and the second roller 5559 through the air inlet 54, which plays the role of cooling, dust removal and ozone removal. In the process of blowing nitrogen, the second motor 5522 is controlled to start and the first motor 553 is reciprocated forward and reversed. Under the action of the second motor 5522, the slide shaft 5523 is rotated, and the cooperation between the slide shaft 5523 and the slider 5525 causes the shift block 5526 to perform a horizontal reciprocating shift action, so that the push rod 5527 drives the carrier frame 5528 to perform an arc trajectory reciprocating up and down with the left side of the top of the pad frame 5521 as the base point, so that the first roller 5554 and the second roller 5559 are arc-shaped. The up and down reciprocating motion of the trajectory drives the base film to move up and down reciprocatingly, and under the reciprocating forward and reverse rotation of the first motor 553, the column rod 5552 drives the first remote rod 5553 to perform a reciprocating left and right swinging motion. When the first remote rod 5553 swings left and right, the first L-shaped rod 5555 causes the indexing seat 5556 to rotate above the rectangular frame 5551. Under the action of the indexing seat 5556, the second L-shaped rod 5557 drives the second rocking rod 5558 to perform a swinging motion in the opposite direction to the first remote rod 5553, so that the first roller 5554 and the second roller 5559 scrape and flatten the base film on the front and back sides below the base film, so that different curvature curves are formed on the front and back sides of the base film, thereby flattening the base film and generating turbulence in the gas blown onto the base film for cooling treatment.

[0050] Fourth, after being purged with nitrogen, the base film passes through the inner side of the two first suspension rollers 6 and above the second suspension roller 7. Air flows out from the air outlets of the first suspension rollers 6 and the second suspension rollers 7 to generate non-contact air cushion suspension, further reducing the temperature of the base film.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A printing process for anti-counterfeiting aluminum-plated laser film, characterized in that: The following steps are involved: (a) A temperature-sensitive color-changing layer is coated on the surface of a biodegradable polyester film. The layer is composed of a mixture of cholesteric liquid crystal and acrylic resin in a ratio of 1:4-6, forming a dynamic anti-counterfeiting layer with color changing in the range of 30-50°C; (b) Laser embossing and pattern printing are completed by a printing press to form a composite layer with both diffraction gratings and color graphics; (c) After embossing and printing, cooling equipment is used to eliminate thermal stress and reduce the generation of microcracks; (d) After cooling, a gradient aluminum layer is deposited on the surface of the composite layer, with the thickness gradually changing from 25 nm in the center to 45 nm in the edge, forming an annular reflective differential band; (e) coating with a protective layer containing plant-derived antioxidants that releases a fluorescent marker during natural degradation; The cooling device comprises a base frame (1), a hopper cover (2) is fastened to the top side of the base frame (1), and a hopper cover (3) is fastened to the four sides of the top of the hopper cover (2), a water-cooled roller (4), a nitrogen bellows mechanism (5), a first suspension roller (6) and a second suspension roller (7) are sequentially arranged inside the hopper cover (2) from left to right, the top of the nitrogen bellows mechanism (5) is arranged through the inside of the hopper cover (3), two groups of the first suspension rollers (6) are arranged and are located on the same vertical plane, and the first suspension roller (6) and the second suspension roller (7) located on the bottom side are on the same horizontal plane, the outer surfaces of the first suspension roller (6) and the second suspension roller (7) are both provided with air ports, and the insides of the first suspension roller (6) and the second suspension roller (7) are provided with air ports. The nitrogen wind box mechanism (5) is connected to the external gas end and is used to blow out the air flow through the air ports of the first suspension roller (6) and the second suspension roller (7); the nitrogen wind box mechanism (5) includes a frame seat (51) fastened to the hopper cover (2) on the left and right sides, a nitrogen air curtain body (52) embedded in the top side of the frame seat (51), an air outlet (53) arranged on the upper middle side of the frame seat (51), an air inlet (54) arranged on the lower side of the frame seat (51), and a support structure (55) fastened to the bottom side of the frame seat (51), the top side of the nitrogen air curtain body (52) is embedded in the inner side of the hopper cover (3), the top side of the air inlet (54) is connected to the nitrogen air curtain body (52), and the left and right sides of the frame seat (51) are provided with through openings for the base film to pass through.

2. The printing process of the anti-counterfeiting aluminum-plated laser film according to claim 1, characterized in that: The surface of the bio-based degradable polyester film is pretreated by plasma with a treatment power of 50-100W and a treatment time of 30-60 seconds, and the surface tension reaches 38-42 mN / m.

3. The printing process of the anti-counterfeiting aluminum-plated laser film according to claim 1, characterized in that: In step (d), the gradient aluminum layer is deposited by a magnetron sputtering coating machine, and the aluminum deposition gradient is controlled by moving the mask plate, and the aperture ratio of the mask plate decreases linearly from 80% in the center to 30% at the edge.

4. The printing process of the anti-counterfeiting aluminum-plated laser film according to claim 1, characterized in that: The protective layer in step (e) contains 5-8% by mass of sodium copper chlorophyllin, which exhibits red fluorescence under 365nm ultraviolet light when degraded.

5. The printing process of the anti-counterfeiting aluminum-plated laser film according to claim 1, characterized in that: After the cooling device treatment in step (c), the base film temperature is reduced to below 40° C., thereby improving the thickness gradient linearity of the magnetron sputtered aluminum layer.

6. The printing process of the anti-counterfeiting aluminum-plated laser film according to claim 1, characterized in that: The support structure (55) includes a vertical plate (551) whose bottom side is fastened to the frame seat (51), a lifting assembly (552) connected to the bottom side of the front portion of the vertical plate (551), a first motor (553) fastened to the left side of the top of the lifting assembly (552), a transmission belt body (554) connected to the output end of the rear side of the first motor (553), and a pushing assembly (555) connected to the right side of the rear portion of the transmission belt body (554), wherein the transmission belt body (554) includes two transmission pulleys and a transmission belt. The transmission pulley on the left side is connected to the rear output end of the first motor (553), the rear middle side of the transmission pulley on the right side is connected to the pushing assembly (555), and the front middle side of the transmission pulley on the right side is rotatably connected to the lifting assembly (552), the front bottom side of the pushing assembly (555) is fixed to the lifting assembly (552), an arc groove (5511) is opened on the upper right side of the interior of the vertical plate (551), and the front part of the pushing assembly (555) is arranged to pass through the inner side of the arc groove (5511).

7. The printing process of the anti-counterfeiting aluminum-plated laser film according to claim 6, characterized in that: The lifting assembly (552) includes a support frame (5521) fastened to the bottom of the rear side and the vertical plate (551), a second motor (5522) locked and fixed to the right part of the top side of the support frame (5521), a slide shaft (5523) connected to the left output end of the second motor (5522), a bearing block (5524) wrapped around the left and right sides of the slide shaft (5523), a slider (5525) slidably connected to the top side of the slide shaft (5523), a shift block (5526) fixed to the top side of the slider (5525), a push rod (5527) rotatably connected to the top side of the shift block (5526), and a bearing block (5524) rotatably connected to the top end of the push rod (5527). The plate carrier (5528) is rotatably connected to the support frame (5521) on the left side of the plate carrier (5528), the top left side of the plate carrier (5528) is fastened to the first motor (553), and the top right side of the plate carrier (5528) is rotatably connected to the transmission pulley located on the right side, the bottom of the bearing block (5524) is fixed to the support frame (5521), and the outer surface of the slide shaft (5523) is provided with two connected spiral grooves, the left and right sides of the shift block (5526) are provided with circular openings, and the bottom of the shift block (5526) is laterally slidably connected to the support frame (5521), and the slide shaft (5523) is arranged to pass through the inside of the circular opening.

8. The printing process of the anti-counterfeiting aluminum-plated laser film according to claim 6, characterized in that: The pushing assembly (555) includes a bracket (5550) fixed to the front side of the lifting assembly (552), a rectangular frame (5551) integrally formed on the rear side of the bracket (5550), a first remote control rod (5553) arranged on the middle side of the front part of the rectangular frame (5551), a column rod (5552) fixed to the bottom side of the front part of the first remote control rod (5553), a first support roller (5554) rotatably connected to the top of the front side of the first remote control rod (5553), a first L-shaped rod (5555) rotating through the middle and lower side of the front part of the first remote control rod (5553), a rotation seat (5556) rotatably connected to the bottom side of the rear part of the first L-shaped rod (5555), and a rotating roller (5556) rotating through the rotating roller (5556). A second L-shaped rod (5557) at the rear side of the second L-shaped rod (5557), a second rocker (5558) rotatably connected to the rear of the second L-shaped rod (5557), a second roller (5559) rotatably arranged at the top of the rear side of the second rocker (5558), and a supporting column (55510) rotatably connected to the bottom side of the front of the second rocker (5558), the front end of the column (5552) is connected to the middle of the transmission pulley located on the right side, the middle side of the bottom of the transfer seat (5556) is rotatably connected to the rectangular frame (5551), the supporting column (55510) is fixed through the middle side of the inside of the rectangular frame (5551), and the front part of the supporting column (55510) is rotatably connected to the first remote rod (5553).

9. The printing process of the anti-counterfeiting aluminum-plated laser film according to claim 8, characterized in that: The first remote control lever (5553) and the second rocker lever (5558) have the same structure and size, and are located in the middle of the rectangular frame (5551) and are arranged in a bilaterally symmetrical manner. The first support roller (5554) and the second support roller (5559) have the same structure and size, and are both elliptical structures with a high middle and low ends.

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