Gravure printing system for printing recognizable random patterns

Abstract

The present invention provides a gravure printing system for printing recognizable random patterns, comprising: an ink supply system; the ink supply system includes an ink cylinder filled with gravure ink, the ink cylinder being connected to an ink reservoir; an air inlet pipe of a bubble generating mechanism, each end of which is connected to an air pump and an air filter device, respectively; the air filter device is connected to an air outlet pipe, and the air outlet pipe is provided with an ink backflow prevention valve; a bubble dispersion device is immersed in the gravure ink in the ink cylinder, and the bubble dispersion device includes at least two layers of sleeves arranged sequentially from the inside to the outside, each layer of sleeves being provided with a plurality of dispersion holes, and any dispersion hole on each layer of sleeves is staggered with any dispersion hole on an adjacent sleeve. In this gravure printing system, the gravure ink in the ink cylinder is subjected to at least two impacts, and bubbles are generated, transferred, and burst in the gravure ink in the ink cylinder. This causes a random pattern to be formed on the surface of a printed substrate when the pattern of the ink reservoir is transferred to the surface of the printed substrate.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging printing, in particular to a gravure printing system for printing recognizable random patterns. Background Art

[0002] Currently, the anti-counterfeiting technologies used in the packaging and printing field on the market are mostly raw material and auxiliary material anti-counterfeiting, process anti-counterfeiting, design anti-counterfeiting, digital information anti-counterfeiting, and optical anti-counterfeiting. Physical feature recognition anti-counterfeiting is rarely used. If physical feature recognition anti-counterfeiting technology is to be applied to printed products, it is necessary to print random patterns on the surface of the substrate of the printed product. In the packaging and printing field, gravure printing technology is a commonly used printing method. During the gravure printing process, the impression is engraved into the surface of the printing plate to form an ink reservoir. The gravure ink fills the ink reservoir and then transfers the impression to the surface of the substrate of the printed product. The gravure ink supply system of the gravure printing continuously pumps the gravure ink in the ink tank into the ink reservoir, and the excess gravure ink in the ink reservoir flows back to the ink tank, forming a cycle. How to combine existing gravure printing technology to print random patterns on the substrate surface of printed products is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a gravure printing system for printing recognizable random patterns in combination with the existing gravure printing technology.

[0004] To achieve the above-mentioned and other related objects, the present invention provides a gravure printing system for printing recognizable random patterns, comprising: an ink supply system, a bubble generating mechanism, an air pump, and a bubble dispersing device;

[0005] The ink supply system includes an ink cylinder filled with gravure ink, the ink cylinder is connected to an ink storage tank on a gravure printing plate, the gravure ink in the ink cylinder can be pumped into the ink storage tank, and the gravure ink in the ink storage tank can flow back to the ink cylinder, forming a cycle;

[0006] The bubble generating mechanism includes an air inlet pipe, an air filter device and an air outlet pipe, the two ends of the air inlet pipe are respectively connected to the air pump and the air inlet of the air filter device, the gas outlet of the air filter device is connected to one end of the air outlet pipe, and the other end of the air outlet pipe is provided with an ink backflow prevention valve;

[0007] The bubble dispersing device is immersed in the gravure ink including the ink cylinder, and the bubble dispersing device includes at least two layers of sleeves arranged in sequence from the inside to the outside, and a plurality of dispersing through holes are evenly arranged on the outer surface of each layer of the sleeve, and any one of the dispersing through holes on each layer of the sleeve is staggered with any one of the dispersing through holes on the adjacent sleeve; the other end of the air outlet pipe extends into the interior of the innermost sleeve.

[0008] Preferably, in two adjacent layers of the sleeves, the size of the diffusion through-holes of the sleeve in the inner layer is larger than the size of the cross-section of the diffusion through-holes of the sleeve in the outer layer.

[0009] Preferably, in two adjacent layers of the sleeves, the cross-sectional shape of the overflow through-holes of the sleeve in the inner layer is different from the shape of the overflow through-holes of the sleeve in the outer layer.

[0010] Preferably, the air filtering device comprises a dust particle filter and a fine filter unit connected to each other; the dust particle filter is connected to the air inlet pipe, and the fine filter unit is connected to the air outlet pipe.

[0011] Preferably, the gravure printing system for printing recognizable random patterns further comprises a power supply mechanism, and the air pump and the bubble generating mechanism are both connected to the power supply mechanism.

[0012] As described above, the gravure printing system for printing recognizable random patterns of the present invention has the following beneficial effects:

[0013] In the gravure printing system for printing recognizable random patterns of the present invention, under the action of an air pump, untreated air is pumped into the air filter device through the air inlet pipe, and after being filtered by the air filter device, the air enters the interior of the innermost sleeve of the bubble dispersing device through the air outlet pipe; when the air is discharged from the air outlet pipe, since the bubble dispersing device includes at least two layers of sleeves arranged in sequence from the inside to the outside, a plurality of dispersing through holes are evenly arranged on the outer surface of each layer of the sleeve, and any one of the dispersing through holes on each layer of the sleeve is staggered with any one of the dispersing through holes on the adjacent sleeve, the air passes through each layer. When the overflow hole of the sleeve is opened, the gravure ink in the ink cylinder will be impacted once; therefore, the gravure ink in the ink cylinder will be impacted at least twice, and there will be bubbles in the gravure ink in the ink cylinder, and the bubbles will be continuously generated, transferred and burst, and the gravure ink entering the ink storage tank will also have bubbles. This makes it so that when the impression of the ink storage tank is transferred to the surface of the substrate of the printed product, a random pattern will be formed on the surface of the substrate, and the random pattern is not continuous, smooth and straight. There will be interruptions, bifurcations or turning points in the random pattern, and each detail has a certain contour. The physical characteristics of the random pattern can be used for anti-counterfeiting identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic structural diagram of a gravure printing system for printing recognizable random patterns according to this embodiment.

[0015] Figure 2 It is a schematic structural diagram showing the arrangement of inserting an air outlet pipe into a sleeve of the gravure printing system for printing recognizable random patterns according to the present embodiment.

[0016] Figure 3 Display as Figure 2 Schematic diagram of the enlarged structure at A.

[0017] Figure 4 Shown is a schematic three-dimensional structure diagram of an inner sleeve of a gravure printing system for printing recognizable random patterns according to this embodiment.

[0018] Figure 5 Shown is a schematic top view of the two-layer sleeve of the gravure printing system for printing recognizable random patterns according to this embodiment.

[0019] Figure 6 Shown is a schematic structural diagram of an air filtration device of a gravure printing system for printing recognizable random patterns according to this embodiment.

[0020] Figure 7 Shown is a schematic diagram of a random pattern of this embodiment.

[0021] Figure 8 Shown is a schematic diagram of another random pattern of this embodiment.

[0022] Explanation of Figure Numbers

[0023] 1 random pattern

[0024] 100 ink supply system

[0025] 110 ink tank

[0026] 120 gravure ink

[0027] 200 Bubble generating mechanism

[0028] 210 intake pipe

[0029] 220 air filter

[0030] 221 Dust particle filter

[0031] 222 Fine filtration unit

[0032] 230 Exhaust pipe

[0033] 240 ink backflow prevention valve

[0034] 250 filter housing

[0035] 300 air pump

[0036] 400 Bubble Dispersion Device

[0037] 410 sleeve

[0038] 420 overflow through hole

[0039] 500 Power Supply Organization DETAILED DESCRIPTION

[0040] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0041] Please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0042] Example 1

[0043] like Figures 1 to 8 As shown, the gravure printing system for printing recognizable random patterns of this embodiment includes: an ink supply system 100, a bubble generating mechanism 200, an air pump 300 and a bubble dispersing device 400;

[0044] The ink supply system 100 includes an ink cylinder 110 filled with gravure ink 120. The ink cylinder 110 is connected to an ink storage tank on a gravure printing plate. The gravure ink 120 in the ink cylinder 110 can be pumped into the ink storage tank, and the gravure ink 120 in the ink storage tank can flow back to the ink cylinder 110, forming a circulation.

[0045] The bubble generating mechanism 200 includes an air inlet pipe 210, an air filter 220, and an air outlet pipe 230. The two ends of the air inlet pipe 210 are respectively connected to the air pump 300 and the air inlet of the air filter 220. The air outlet of the air filter 220 is connected to one end of the air outlet pipe 230. The other end of the air outlet pipe 230 is provided with an ink backflow prevention valve 240.

[0046] The bubble dispersing device 400 is immersed in the gravure ink 120 in the ink cylinder 110. The bubble dispersing device 400 includes at least two layers of sleeves 410 arranged in sequence from the inside to the outside. A plurality of dispersing holes 420 are evenly arranged on the outer surface of each layer of sleeve 410. Any dispersing hole 420 on each layer of sleeve 410 is staggered with any dispersing hole 420 on the adjacent sleeve 410; the other end of the air outlet pipe 230 extends into the interior of the innermost sleeve 410.

[0047] In the gravure printing system for printing recognizable random patterns of the present invention, under the action of the air pump 300, the untreated air is pumped 300 into the air filter device 220 through the air inlet pipe 210, and after being filtered by the air filter device 220, it enters the interior of the innermost sleeve 410 of the bubble dispersing device 400 through the air outlet pipe 230; when the air is discharged from the air outlet pipe 230, since the bubble dispersing device 400 includes at least two layers of sleeves 410 arranged in sequence from the inside to the outside, a plurality of dispersing through holes 420 are evenly arranged on the outer surface of each layer of sleeve 410, and any dispersing through hole 420 on each layer of sleeve 410 is staggered with any dispersing through hole 420 of the adjacent sleeve 410, the dispersing through holes 420 of the adjacent two layers of sleeves 410 are staggered. The overflow holes 420 do not overlap, so when air passes through the overflow holes 420 of each layer of the sleeve 410, it will impact the gravure ink 120 in the ink cylinder 110 once; therefore, the gravure ink 120 in the ink cylinder 110 will be impacted at least twice, and there will be bubbles in the gravure ink 120 in the ink cylinder 110. These bubbles will be continuously generated, transferred, and burst, and the gravure ink 120 entering the ink reservoir will also contain bubbles. This causes a random pattern 1 to be formed on the surface of the substrate when the print of the ink reservoir is transferred to the surface of the printed product. The random pattern 1 is not continuous, smooth, and straight, but rather interrupted, bifurcated, or turned. At the same time, each detail has a certain contour, and the random pattern 1 is extremely similar to a fingerprint.

[0048] The random pattern 1 includes various random structures. The physical characteristics of the random structure are the image characteristics of the random structure. The image characteristics of the random structure include the starting point, end point, breakpoint, bifurcation point, turning point and outline of the random structure. The image characteristics of the random structure are combined with existing computer technology and image recognition technology for specific scenarios. Therefore, the physical characteristics of the random pattern 1 can be used for anti-counterfeiting identification.

[0049] The ink cylinder 110 is filled with gravure ink 120, which is continuously pumped into the ink reservoir on the gravure printing plate. Excess gravure ink 120 in the ink reservoir can flow back into the ink cylinder 110. The gravure ink 120 in the ink cylinder 110 is pumped into the ink reservoir under pressure, and the gravure ink 120 in the ink reservoir flows back into the ink cylinder 110, causing the ink to circulate continuously within the ink cylinder 110.

[0050] The bubble dispersing device 400 is immersed below the liquid surface of the gravure ink 120 in the ink tank 110 so that the bubbles are evenly dispersed in the gravure ink 120 .

[0051] In order to fully and evenly disperse the air pumped into the gravure ink 120 in the ink system, the bubble dissipation device is configured as at least a double-layer sleeve 410 .

[0052] In two adjacent sleeves 410, the size of the overflow holes 420 of the inner sleeve 410 is larger than the cross-sectional size of the overflow holes 420 of the outer sleeve 410. This structure allows most of the air to pass through the overflow holes 420 of the inner sleeve 410 after passing through the overflow holes 420 of the outer sleeve 410, thereby generating sufficient bubbles in the gravure ink 120.

[0053] In two adjacent layers of sleeves 410, the cross-sectional shape of the overflow holes 420 of the inner sleeve 410 is different from the cross-sectional shape of the overflow holes 420 of the outer sleeve 410. This structure facilitates the staggered arrangement of the overflow holes 420 of the two adjacent layers of sleeves 410 after installation, preventing them from overlapping.

[0054] In this embodiment, for ease of installation, the bubble dispersion device 400 includes two layers of sleeves 410. The dispersion holes 420 of the inner sleeve 410 are circular, and the dispersion holes 420 of the outer sleeve 410 are regular octagons. This structure can increase the bubble dispersion ratio.

[0055] The diameter of the overflow hole 420 in the inner sleeve 410 is in the range of 4.7-5.3 mm, while the diameter of the circumcircle of the overflow hole 420 in the outer sleeve 410 is in the range of 0.8-1.2 mm. This range facilitates the continuous generation, transfer, and collapse of bubbles. In this embodiment, the diameter of the overflow hole 420 in the inner sleeve 410 is 5 mm, and the diameter of the circumcircle of the overflow hole 420 in the outer sleeve 410 is 1 mm.

[0056] The ink backflow prevention valve 240 can be a one-way valve.

[0057] The bubble dispersing device 400 is cylindrical, and its bottom surface is flat, and the bottom surface of the bubble dispersing device 400 contacts the bottom surface of the ink cylinder 110. The bubble dispersing device 400 is perpendicular to the bottom surface of the ink cylinder 110.

[0058] The air filter device 220 includes a dust particle filter 221 and a fine filter unit 222 connected to each other; the dust particle filter 221 is connected to the air inlet pipe 210 , and the fine filter unit 222 is connected to the air outlet pipe 230 .

[0059] The bubble generating mechanism 200 includes a dust particle filter 221 and a fine filter unit 222, achieving dual air filtration. The dust particle filter 221 performs a primary filtration of dust, particles, and other floating matter in the air, primarily removing dust. This preliminarily filtered air is then fed into the fine filter unit 222, which further filters out dust, paper fibers, and other matter. The air passing through the fine filter unit 222 reaches the PM2.5 standard. Both the dust particle filter 221 and the fine filter unit 222 are housed in the filter housing 250.

[0060] The gravure printing system for printing recognizable random patterns also includes a power supply mechanism 500, to which both the air pump 300 and the bubble generating mechanism 200 are connected. The output power of the air pump 300 is steplessly adjustable. By adjusting the power of the air pump 300, the air output of the air pump 300 can be adjusted, thereby adjusting the amount of air bubbles incorporated into the gravure ink 120. Both the air pump 300 and the bubble generating mechanism 200 are connected to the power supply mechanism 500 via electrical wires.

[0061] In conventional gravure printing technology, solvent-based gravure ink 120 has high leveling requirements to ensure smooth printing without pinhole defects, requiring the air content in the ink to be minimized. However, the gravure printing system for printing recognizable random patterns in this embodiment aims to increase the air bubble capacity in the gravure ink 120.

[0062] The gravure printing system for printing recognizable random patterns in this embodiment uses the pump pressure generated by an air pump 300 to create a stable fusion of air and gravure ink 120, forming a bubble-ink mixture of a certain particle size and content within the gravure ink 120. After the gravure ink 120 is transferred to the surface of a substrate using a gravure printing plate, the bubbles within the ink burst due to the change in external pressure, resulting in the gravure ink 120 producing a unique random pattern 1 on the substrate surface. This random pattern 1 possesses individual random physical characteristics. Its physical randomness, irreproducibility, and uniqueness meet all the requirements of anti-counterfeiting technology. Combined with existing computer image feature recognition technology, it can be applied as an anti-counterfeiting technology in the packaging and printing field.

[0063] Taking the proofing of an 84mm Zhonghua hard box product as an example, the printing paper used was 250g of 0-degree transfer silver card paper, the gravure ink 120 used an acrylic solvent-based ink, and the diluents used were ethyl acetate and n-propyl acetate. The bubble dispersion device 400 in this embodiment was connected to the ink reservoir 110, and the printing press speed and the delivery power of the air pump 300 were adjusted according to the actual printing effect. During the product proofing process, the sheetfed gravure press ran at 5500 sheets / hour, the gravure ink 120 viscosity was controlled at approximately 21 seconds, and the air pump 300 output power was set to 65%, achieving the best printing effect and the clearest texture of the random pattern 1, which could meet the requirements of later feature image recognition.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A gravure printing system for printing recognizable random patterns, characterized in that include: Ink supply system (100), bubble generating mechanism (200), air pump (300) and bubble dispersing device (400); The ink supply system (100) comprises an ink cylinder (110), wherein the ink cylinder (110) is filled with gravure ink (120), and the ink cylinder (110) is connected to an ink storage tank on a gravure printing plate, wherein the gravure ink (120) in the ink cylinder (110) can be pumped into the ink storage tank, and the gravure ink (120) in the ink storage tank can flow back to the ink cylinder (110), thereby forming a cycle; The bubble generating mechanism (200) comprises an air inlet pipe (210), an air filter device (220), and an air outlet pipe (230); the two ends of the air inlet pipe (210) are respectively connected to the air pump (300) and the air filter device (220); the air outlet of the air filter device (220) is connected to one end of the air outlet pipe (230); and the other end of the air outlet pipe (230) is provided with an ink backflow prevention valve (240); The bubble dispersing device (400) is immersed in the gravure ink (120) in the ink cylinder (110), and the bubble dispersing device (400) includes at least two layers of sleeves (410) arranged in sequence from the inside to the outside, and a plurality of dispersing through holes (420) are evenly arranged on the outer surface of each layer of sleeve (410); the other end of the air outlet pipe (230) extends into the interior of the innermost layer of the sleeve (410).

2. The gravure printing system for printing recognizable random patterns according to claim 1, characterized in that: In two adjacent layers of the sleeves (410), the size of the overflow through-hole (420) of the sleeve (410) in the inner layer is larger than the size of the overflow through-hole (420) of the sleeve (410) in the outer layer.

3. The gravure printing system for printing recognizable random patterns according to claim 1, characterized in that: In two adjacent layers of the sleeves (410), the cross-sectional shape of the overflow through hole (420) of the sleeve (410) in the inner layer is different from the cross-sectional shape of the overflow through hole (420) of the sleeve (410) in the outer layer.

4. The gravure printing system for printing recognizable random patterns according to claim 1, characterized in that: The air filtering device (220) comprises a dust particle filter (221) and a fine filter unit (222) connected to each other; the dust particle filter (221) is connected to the air inlet pipe (210), and the fine filter unit (222) is connected to the air outlet pipe (230).

5. The gravure printing system for printing recognizable random patterns according to claim 1, characterized in that: It also includes a power supply mechanism (500), and the air pump (300) and the bubble generating mechanism (200) are both connected to the power supply mechanism (500).

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