Printing ink drying device for anti-counterfeiting stained paper

Abstract

The invention relates to the technical field of printing equipment, in particular to a printing ink drying device for anti-counterfeiting stained paper, which comprises a rack, a conveying mechanism is arranged above the rack, a drying box body is arranged above the conveying mechanism, and the drying box body is sequentially divided into a leveling preheating area, a main curing area and a forced cooling area along the conveying direction; the conveying mechanism comprises a high-temperature-resistant conveying mesh belt and a vacuum adsorption platform arranged below the mesh belt; an LED-UV cold light source assembly is arranged in the main curing area, infrared heating pipes transversely arranged in the leveling preheating area and a reflecting cover above the infrared heating pipes are matched with the LED-UV cold light source assembly with a water-cooling circulation flow channel in the main curing area and an external cooling-water machine, and printing ink is evenly heated through infrared radiation to be leveled firstly; curing is completed through low-temperature ultraviolet light, a light source is cooled synchronously in a circulating mode, the effects of ink flat curing and paper low-heat deformation are achieved synchronously, and high-speed continuous operation is effectively supported.

Description

Technical Field

[0001] This invention relates to the field of printing equipment technology, and in particular to an ink drying device for anti-counterfeiting decals. Background Technology

[0002] In the printing process of anti-counterfeiting decals, the quality of ink drying directly affects the clarity of the pattern, color stability, and reliability of the anti-counterfeiting function. Traditional drying devices mostly use hot air or mercury lamp UV light sources for curing. Although hot air drying is suitable for some solvent-based inks, it heats up slowly and has high thermal inertia, which can easily lead to uneven heating of the paper and imbalance of moisture content, resulting in problems such as curling and misregistration. While traditional mercury lamp UV curing is fast, its spectrum contains a large amount of visible light and infrared radiation, and the surface temperature can reach above 150°C during operation, causing local overheating and fiber shrinkage of the paper. Especially for thin or high-humidity sensitive anti-counterfeiting decals, irreversible thermal deformation can easily occur, affecting subsequent precision processing such as die-cutting and hot stamping.

[0003] Most existing UV curing devices do not implement segmented temperature control for the ink leveling and curing processes. If the ink is directly exposed to high-intensity irradiation after printing, the surface cross-links rapidly while the internal solvent or reactive diluent has not been fully released, easily leading to a phenomenon of surface dryness and internal wetness. This results in concentrated shrinkage stress in the film layer, causing orange peel, pinholes, or uneven gloss on the surface. Therefore, existing technologies have significant shortcomings in achieving high-speed, low-temperature, and smooth curing of high-precision anti-counterfeiting decals. Summary of the Invention

[0004] The purpose of this invention is to provide an ink drying apparatus for anti-counterfeiting decals to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An ink drying device for anti-counterfeiting decals includes a frame, a conveying mechanism mounted above the frame, and a drying chamber mounted above the conveying mechanism. The drying chamber is divided into a leveling preheating zone, a main curing zone, and a strong cooling zone along the conveying direction. The conveying mechanism includes a high-temperature resistant conveyor belt and a vacuum adsorption platform disposed below the conveyor belt. An LED-UV cold light source assembly is disposed in the main curing zone.

[0006] Preferably, the leveling preheating zone is provided with several groups of infrared heating tubes, which are arranged horizontally, and each heating tube is provided with a reflector above it.

[0007] Preferably, the LED-UV cold light source assembly is mounted on the top of the drying chamber via a lifting and adjusting mechanism, which includes a lead screw and a drive motor.

[0008] Preferably, the strong cooling zone includes a strong cooling fan located at the top of the box and an electrostatic eliminator located at the paper outlet.

[0009] Preferably, the top of the drying chamber is provided with a waste gas collection hood, and the waste gas collection hood is connected to an activated carbon filter box through a pipe.

[0010] Preferably, the upper surface of the vacuum adsorption platform is uniformly distributed with air suction holes, and the interior of the platform is divided into several independent negative pressure chambers by partitions.

[0011] Preferably, the paper feed end of the frame is provided with a tensioning mechanism, which includes a tensioning roller and an adjusting screw mounted on the slider.

[0012] Preferably, the substrate of the LED-UV cold light source assembly is provided with a water-cooled circulation channel.

[0013] Compared with the prior art, the beneficial effects of this invention are as follows: 1. The infrared heating tubes arranged horizontally in the leveling preheating zone and their reflectors above them, together with the LED-UV cold light source components with water-cooled circulation channels in the main curing zone and the external chiller, firstly, the ink is uniformly heated by infrared radiation to promote its leveling, and then cured by low-temperature ultraviolet light while simultaneously circulating and cooling the light source. This achieves the effect of smooth curing of ink and low thermal deformation of paper, effectively supporting high-speed continuous operation.

[0014] 2. The cured decals are forced to cool by a powerful cooling fan at the top of the cooling zone, which quickly reduces the surface temperature. This solution has multiple effects: on the one hand, it inhibits the thermal reaction of the ink film and stabilizes its physical properties; on the other hand, it reduces the moisture migration and thermal stress of the paper caused by temperature differences and maintains dimensional stability; at the same time, it works in conjunction with the static elimination bar at the paper exit to effectively neutralize frictional static electricity and improve the neatness of winding and adaptability to subsequent processing.

[0015] 3. The LED-UV cold light source component is installed on the top of the drying chamber via a lifting and adjusting mechanism. The vertical irradiation distance between it and the conveyor belt can be adjusted. In this solution, the irradiation intensity can be flexibly adjusted according to the curing energy requirements of different inks, thereby improving curing efficiency and uniformity. At the same time, it avoids local overheating caused by being too close or energy attenuation caused by being too far away. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a front view schematic diagram of the overall structure of the present invention; Figure 2This is one of the partial structural cross-sectional schematic diagrams of the overall structure of the present invention; Figure 3 This is a second partial structural cross-sectional view of the overall structure of the present invention; Figure 4 This is the third partial structural cross-sectional view of the overall structure of the present invention; Figure 5 This is the fourth partial structural cross-sectional view of the overall structure of the present invention.

[0017] The attached figures are labeled as follows: 1. Frame; 2. Conveyor belt; 3. Vacuum adsorption platform; 301. Suction port; 302. Negative pressure chamber; 4. Leveling preheating zone; 401. Infrared heating tube; 5. Main curing zone; 6. Strong cooling zone; 601. Strong cooling fan; 602. Static eliminator; 7. Tensioning mechanism; 701. Tensioning roller; 702. Adjusting screw; 8. LED-UV cold light source assembly; 801. Lifting and adjusting mechanism; 9. Exhaust gas collection hood; 901. Activated carbon filter box. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0019] An ink drying device for anti-counterfeiting decals, such as Figures 1-5 As shown, the device includes a frame 1, a conveying mechanism mounted on top of the frame 1, and a drying chamber mounted on top of the conveying mechanism. The drying chamber is divided into a leveling preheating zone 4, a main curing zone 5, and a strong cooling zone 6 along the conveying direction. The conveying mechanism includes a high-temperature resistant conveyor belt 2 and a vacuum adsorption platform 3 located below the conveyor belt. An LED-UV cold light source assembly 8 is installed in the main curing zone 5.

[0020] The frame 1 supports all working parts. Above the frame 1 are the conveying mechanism and the drying chamber. The drying chamber is the core working area of ​​the device. According to the ink drying process, it is divided into continuous functional areas along the material conveying direction: the leveling preheating zone 4, the main curing zone 5, and the strong cooling zone 6, realizing continuous processing of the drying process. The conveying mechanism consists of a high-temperature resistant conveyor belt 2 and a vacuum adsorption platform 3 located below it. The conveyor belt 2 is responsible for carrying and conveying the anti-counterfeiting decals. The vacuum adsorption platform 3 uses the principle of negative pressure to stably adsorb the decals onto the conveyor belt 2, ensuring that the decals do not shift or warp during high-speed movement. In the main curing zone 5, an LED-UV cold light source component 8 is installed, which uses ultraviolet light irradiation to make the ink quickly undergo a polymerization reaction and cure.

[0021] The leveling preheating zone 4 is equipped with several sets of infrared heating tubes 401, which are arranged horizontally, and each heating tube is equipped with a reflector above it.

[0022] Inside the leveling preheating zone 4, multiple sets of horizontally arranged infrared heating tubes 401 are installed. Each infrared heating tube 401 is equipped with a reflector. Using the principle of infrared radiation heating, heat is evenly and efficiently focused and projected onto the ink layer on the surface of the decal, which reduces the viscosity of the ink and helps to eliminate the printing lines before the ink is cured, thus improving the smoothness of the ink surface.

[0023] The LED-UV cold light source assembly 8 is mounted on the top of the drying chamber via a lifting and adjusting mechanism 801, which includes a lead screw and a drive motor.

[0024] The LED-UV cold light source component 8 is mounted on the top of the housing via a lifting and adjusting mechanism 801. The lifting and adjusting mechanism 801 mainly consists of a lead screw and a drive motor. The motor drives the lead screw to achieve precise vertical lifting of the LED-UV cold light source component 8. This design allows for convenient adjustment of the optimal vertical irradiation distance between the LED-UV cold light source component 8 and the decal on the conveyor belt 2 to adapt to the UV light intensity required by different curing inks. The specific model of the drive motor is FISCHER PF-30-24 / 1.

[0025] The strong cooling zone 6 includes a strong cooling fan 601 located on the top of the box and an electrostatic eliminator 602 located at the paper outlet.

[0026] The powerful cooling fan 601 located at the top of the box blows cooling gas onto the surface of the decal to quickly reduce the surface temperature of the decal that has just been cured. At the paper outlet where the decal leaves the drying box, an electrostatic eliminator 602 is installed. Using the principle of air ionization, it eliminates the static charge accumulated by friction during the conveying and drying process of the decal, preventing poor winding of the decal due to electrostatic adsorption.

[0027] The top of the drying chamber is equipped with a waste gas collection hood 9, which is connected to an activated carbon filter box 901 via a pipe.

[0028] An exhaust gas collection hood 9 is installed on the top of the drying chamber to capture organic waste gas generated by ink volatilization or curing reaction during the drying process. The exhaust gas collection hood 9 is connected to the activated carbon filter box 901 through a pipe. The activated carbon filter box 901 is equipped with an activated carbon adsorption layer that can be easily pulled out and replaced. By utilizing the physical adsorption characteristics of the porous structure of activated carbon, it effectively filters and purifies harmful substances in the exhaust gas to meet environmental emission requirements.

[0029] The upper surface of the vacuum adsorption platform 3 is evenly distributed with suction holes 301, and the interior of the platform is divided into several independent negative pressure chambers 302 by partitions.

[0030] Multiple suction holes 301 are evenly opened on the upper surface of the vacuum adsorption platform 3. These suction holes 301 are connected to the inside of the platform. The inside of the platform is divided into several independent negative pressure chambers 302 by partitions. By evacuating the negative pressure chambers 302 to form negative pressure, the decals are adsorbed onto the conveyor belt 2 through the suction holes 301, so as to achieve stable conveying. At the same time, the design of independent negative pressure chambers 302 makes it easy to control the adsorption pressure in different areas.

[0031] The paper feed end of the frame 1 is provided with a tensioning mechanism 7, which includes a tensioning roller 701 and an adjusting screw 702 mounted on the slider.

[0032] At the end of the frame 1 near the paper feed, a tensioning mechanism 7 is provided. The tensioning mechanism 7 consists of a tensioning roller 701 and an adjusting screw 702. The tensioning roller 701 is mounted on the slider. By rotating the adjusting screw 702, the tensioning roller 701 is moved, thereby mechanically adjusting the tension of the conveyor belt 2 to ensure the smoothness and synchronization of the conveyor belt 2 during operation.

[0033] The substrate of the LED-UV cold light source component 8 is equipped with a water-cooled circulation channel.

[0034] The LED-UV cold light source component 8 has an integrated water-cooled circulation channel inside its substrate. The water-cooled circulation channel is connected to an external chiller through corresponding inlet and outlet water pipes to form a closed-loop cooling system. The flowing low-temperature water carries away the large amount of heat generated when the LED light source is working, and the LED-UV cold light source component 8 is kept in a stable low-temperature state by circulating cooling, so as to ensure the output stability and service life of the light source.

[0035] The working principle of the ink drying device for anti-counterfeiting decals provided by the present invention is as follows: the decal is carried by a high-temperature resistant conveyor belt 2, and the vacuum adsorption platform 3 below uses the suction force generated by the negative pressure chamber 302 and the air suction hole 301 to ensure that the decal remains flat and does not shift when running at high speed.

[0036] The decal enters the leveling and preheating zone 4, where the infrared heating tube 401, in conjunction with the reflector, preheats the ink evenly, giving it good fluidity, eliminating printing textures, and completing the leveling process.

[0037] Then it enters the main curing zone 5, where the LED-UV cold light source component 8 performs efficient ultraviolet curing. The height of this light source is adjustable through the lifting adjustment mechanism 801 to adapt to different curing requirements. At the same time, the water-cooled circulation channel inside the light source substrate ensures the stability of the light source and extends its service life.

[0038] Then it enters the strong cooling zone 6, where the strong cooling fan 601 quickly removes the heat and the static electricity is eliminated by the static elimination rod 602 at the paper outlet, ensuring that the paper rolls up smoothly.

[0039] The device is also equipped with an exhaust gas collection hood 9 and an activated carbon filter box 901, which realizes the effective collection and purification of exhaust gas generated during the production process, reflecting the environmental protection design. At the same time, the tensioning mechanism 7 ensures the running accuracy of the conveyor belt 2.

[0040] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An ink drying device for security paper, characterized by, Including frame (1), the frame (1) is installed with conveying mechanism, the conveying mechanism is installed with drying box body, drying box body is divided into flow flat preheating area (4), main solidification area (5) and strong cold area (6) in turn along conveying direction;Conveying mechanism includes high-temperature-resistant conveying mesh belt (2) and vacuum adsorption platform (3) arranged below mesh belt;Main solidification area (5) is provided with LED-UV cold light source assembly (8).

2. The ink drying device for security paper according to claim 1, characterized in that, The flow flat preheating area (4) is provided with a plurality of groups of infrared heating pipes (401), the heating pipes are arranged horizontally, and a reflecting cover is arranged above each heating pipe.

3. The ink drying device for security paper according to claim 1, wherein The LED-UV cold light source assembly (8) is installed on the top of the drying box body through the lifting adjusting mechanism (801), and the lifting adjusting mechanism (801) includes a lead screw and a driving motor.

4. The ink drying device for security paper according to claim 1, wherein The strong cold area (6) includes a strong cold fan (601) arranged on the top of the box body and an electrostatic eliminator (602) arranged at the paper outlet.

5. The ink drying device for security paper according to claim 1, wherein A waste gas collecting cover (9) is provided on the top of the drying box body, and the waste gas collecting cover (9) is connected with an activated carbon filter box (901) through a pipeline.

6. The ink drying device for security paper according to claim 1, wherein The upper surface of the vacuum adsorption platform (3) is uniformly distributed with suction holes (301), and the inside of the platform is divided into a plurality of independent negative pressure chambers (302) by a partition.

7. The ink drying device for security paper according to claim 1, wherein A tensioning mechanism (7) is arranged at the paper inlet end of the frame (1), and the tensioning mechanism (7) includes a tensioning roller (701) and an adjusting screw (702) mounted on a sliding block.

8. The ink drying device for security paper according to claim 3, wherein A water-cooling circulation channel is arranged inside the base plate of the LED-UV cold light source assembly (8).

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