Satellite flexo press LED-UV and mercury lamp hybrid curing system

Abstract

The utility model relates to a satellite type soft printing machine LED-UV and mercury lamp mixed curing system, including frame and first drying device, center impression cylinder rotatable is located in the frame, and the outer periphery interval arrangement of center impression cylinder has several printing color groups, first drying device includes several LED-UV lamps, several LED-UV lamps are corresponding connection with several printing color groups one to one respectively, is used to preliminary solidification to the printed printing material, and several LED-UV lamps are used to carry out light solidification to the printing material after several printing color groups printing after the center impression cylinder on the printing, frame still is installed with second drying device, and second drying device includes mercury lamp. This satellite type soft printing machine LED-UV and mercury lamp mixed curing system, this LED-UV lamp is responsible for immediate surface solidification, prevents back smudge, and mercury lamp is responsible for final depth solidification, overcomes the problem that the curing depth of pure LED-UV system can exist is insufficient, ensures the quality of final product.

Description

Technical Field

[0001] This utility model relates to the field of printing machinery design technology, specifically to a satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system. Background Technology

[0002] Flexographic printing presses are machines that use flexible plates and anilox rollers to transfer ink to complete the printing process. Currently, the drying systems of domestic satellite flexographic printing presses basically use boiler steam delivered through pipelines to the drying unit and drying channel of the flexographic printing press to achieve complete drying of the printed products, or use UV curing drying to complete the drying of the printed products.

[0003] For example, the LED cationic light curing satellite flexographic printing equipment and printing method disclosed in Chinese Publication No. CN117445536B effectively improves the problems of high pollution from traditional solvent-based inks and high energy consumption of traditional UV lamps by using solvent-free inks in combination with LED curing devices, thus achieving environmentally friendly printing and curing. At the same time, by replacing traditional UV lamps with LED curing devices, it reduces energy consumption during the curing process, resulting in faster curing speed, better fixation effect, and greater energy efficiency and environmental friendliness.

[0004] Regarding the aforementioned technologies, the inventors believe that they have the following drawbacks: While using only a single LED curing device to complete the post-printing curing process can meet the needs of some conventional printing conditions, in complex actual production scenarios and for some special substrates or specific types of inks, a single LED curing device cannot guarantee sufficient bonding between the ink layer and the substrate surface. This easily leads to insufficient ink layer curing depth and weak adhesion, making it difficult to fully adapt to diverse printing requirements. The stability and adaptability of the curing effect still have room for improvement. Therefore, a satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system is proposed to solve the above problems. Utility Model Content

[0005] The main objective of this invention is to provide a hybrid curing system for satellite-type flexographic printing presses, combining LED-UV and mercury lamps. The LED-UV lamps are responsible for immediate surface curing to prevent back-to-back rubbing, while the mercury lamps are responsible for final deep curing, thus overcoming the problem of insufficient curing depth that may exist in pure LED-UV systems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system, including a machine base and a first drying device, a central impression cylinder rotatably disposed in the machine base, a plurality of printing color groups are arranged at intervals on the outer periphery of the central impression cylinder, the first drying device includes a plurality of LED-UV lamps, the plurality of LED-UV lamps are respectively connected to the plurality of printing color groups in a one-to-one correspondence, used for preliminary curing of the printed substrate, the plurality of LED-UV lamps are used to sequentially photocur the substrates printed by the plurality of printing color groups that have passed through the central impression cylinder;

[0007] The machine base is also equipped with a second drying device, which includes a mercury lamp. The mercury lamp is used to irradiate the substrate after it has been initially cured by all the first drying devices to achieve deep curing of the ink.

[0008] Furthermore, it also includes a winding device and an unwinding device mounted on the machine base. The unwinding device is used in the printing process to release the substrate to be printed, and the winding device is mounted on the machine base in the printing process to wind up the solidified substrate.

[0009] Furthermore, it also includes a traction unit, which includes a feeding traction device and a receiving traction device, both of which can be rotatably mounted on the machine base.

[0010] Furthermore, the first drying device includes 7 LED-UV lamps, and the printing color group is provided with 7 lamps. The irradiation area of ​​the 7 LED-UV lamps corresponds to the overprinting area of ​​the corresponding printing color group.

[0011] Furthermore, the peak wavelength of the LED-UV lamp is 365nm or 395nm, which is suitable for the surface curing reaction requirements of the ink.

[0012] Furthermore, the number of mercury lamps is at least two, and several mercury lamps are arranged in a straight line along the axial direction of the central impression cylinder on the machine base to ensure that there are no blind spots in the width direction of the printed material.

[0013] Furthermore, the outer circumferential surface of the central impression cylinder is wrapped with a silicone layer to improve the adhesion between the substrate and the central impression cylinder and reduce slippage during the transmission process.

[0014] Furthermore, it also includes a general control system, which is electrically connected to the first drying device, the second drying device, the drive mechanism of the central impression cylinder, the unwinding device, and the rewinding device via wires. The general control system is used to independently control the start and stop of the LED-UV lamp and the power of the mercury lamp, and to coordinate the control of the rotation speed of the central impression cylinder, the unwinding device, and the rewinding device to adapt to the curing requirements of different substrate materials and different types of inks.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0016] This satellite-type flexographic printing press features a hybrid LED-UV and mercury lamp curing system. The LED-UV lamp handles immediate surface curing to prevent back-scratching, while the mercury lamp handles the final deep curing. This overcomes the potential problem of insufficient curing depth in pure LED-UV systems, ensuring the quality of the final product. Most of the curing energy is provided by the energy-efficient LED-UV lamp, with the higher-power mercury lamp used only in the final stage. Furthermore, the mercury lamp does not need to be constantly on, resulting in significantly lower overall energy consumption compared to pure mercury lamp systems. This reduces the number and duration of mercury lamp use, lowering the risk of mercury contamination and replacement frequency, leading to lower overall operating costs. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the second drying device and the printing substrate of this utility model;

[0019] Figure 3 This is a cross-sectional structural schematic diagram of the second drying device of this utility model;

[0020] Figure 4 This utility model Figure 3 Enlarged view of point A in the middle.

[0021] In the diagram: 1. Central impression cylinder; 2. Printing color group; 3. First drying device; 4. Second drying device; 5. Mercury lamp; 6. Printing substrate; 7. Machine base; 8. Unwinding device; 9. Rewinding device. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-2This embodiment of a satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system includes a base 6 and a first drying device 3. A central impression cylinder 1 is rotatably disposed within the base 6. Several printing color groups 2 are arranged at intervals on the outer periphery of the central impression cylinder 1. The specific number of printing color groups 2 can be adjusted according to the requirements of multi-color overprinting. After the substrate 5 is released by the subsequent unwinding device 7, it adheres to the outer periphery of the rotatable central impression cylinder 1 and passes through each printing color group 2 in sequence as the cylinder rotates, completing multi-color overprinting. The first drying device 3 includes several LED-UV lamps, which are used to sequentially light-cur the substrate 5 after printing by the several printing color groups 2 that have passed through the central impression cylinder 1. After the printing color groups 2 have completed overprinting, the substrate 5 immediately enters the irradiation range of the LED-UV lamps.

[0024] Several LED-UV lamps 3 correspond one-to-one with several printing color groups 2 and are installed at the rear end of the corresponding printing color group 2 along the transmission direction. They are used to pre-cur the printed substrate 5. After each printing color group 2 completes the single-color ink overprinting, the substrate 5 immediately enters the first drying device 3 at the corresponding rear end. The LED-UV lamps are turned on and illuminate the freshly printed wet ink layer for instant light curing, which can quickly fix the ink layer shape and avoid the possibility of color mixing when the substrate 5 enters the next printing color group 2. A second drying device 4 is also installed on the machine base 6. The second drying device 4 includes a mercury lamp 41. The mercury lamp 41 is used to irradiate the substrate 5 after all the first drying devices 3 have pre-cured it a second time to achieve deep curing of the ink.

[0025] After the substrate 5 is released by the subsequent unwinding device 7, it adheres to the outer circumference of the rotatable central impression cylinder 1 and passes through each printing color group 2 in sequence as the cylinder rotates, thus completing multicolor overprinting.

[0026] After each printing color group 2 completes the single-color ink overprinting, the substrate 5 immediately enters the corresponding LED-UV lamp at the back end. The LED-UV lamp is turned on and shines on the freshly printed wet ink layer for instant light curing, which can quickly fix the ink layer shape and avoid the possibility of color mixing when the substrate 5 enters the next printing color group 2.

[0027] After the substrate 5 has completed the overprinting of all printing color groups 2 and the initial curing of the corresponding first drying device 3, it is transferred to the irradiation area of ​​the second drying device 4 along with the central impression roller 1. The mercury lamp 41 is then turned on to irradiate the initially cured ink layer a second time, so that the ink layer can be deeply cured and achieve the effect of firmly curing the ink layer on the substrate 5.

[0028] The device also includes a winding device 8 and an unwinding device 7 mounted on the machine base 6. The unwinding device 7 is used to release the substrate 5 to be printed during the printing process. The unwinding device 7 is fixed to the front end of the printing process of the machine base 6 by a bracket and is used to load the roll of the substrate 5 to be printed. The winding device 8 is mounted on the printing process of the machine base 6 to wind up the cured substrate 5. The winding device 8 is installed at the end of the printing process of the machine base 6, that is, on one side of the discharge end of the second drying device 4, and is used to collect the finished substrate 5 after printing and curing.

[0029] It also includes a traction unit, which comprises an infeed traction device and a take-up traction device, both of which are rotatably mounted on the base 6. The infeed traction device is located on the substrate 5 transport path between the unwinding device 7 and the printing color group 2, and is used to pull the substrate 5 from the unwinding unit to the surface of the central impression cylinder 1. The take-up traction device is located on the substrate 5 transport path between the second drying device 4, the rewinding device 8, and the first drying device 3.

[0030] In addition, there are seven printing color groups 2, with seven LED-UV lamps connected one-to-one with each of the seven printing color groups 2, and the irradiation area of ​​each LED-UV lamp corresponds to the overprinting area of ​​the corresponding printing color group 2. The central impression cylinder 1 drives the substrate 5 to rotate, passing through the first to seventh printing color groups 2 in sequence, with each printing color group transferring the preset color ink to the surface of the substrate 5. As soon as the substrate 5 leaves the printing color group 2, it immediately enters the irradiation range of the corresponding LED-UV lamp, which preliminarily cures the newly printed monochrome ink layer and quickly fixes the adhesion form of the ink layer.

[0031] Because the ink layer of each color group is cured in real time by the corresponding LED-UV lamp, when the substrate 5 enters the next color group, the ink layer of the previous color has been dried and set, avoiding the problem of the ink of the next color smudging the ink of the previous color.

[0032] Furthermore, the peak wavelength of the LED-UV lamp is 365nm or 395nm, which is suitable for the surface curing reaction requirements of ink.

[0033] Please see Figure 1-4 In this embodiment, there are at least two mercury lamps 41. Several mercury lamps 41 are arranged in a row along the axial direction of the central impression cylinder 1 on the machine base 6 to ensure that there are no blind spots in the width direction of the substrate 5. After the substrate 5 is initially cured by seven LED-UV lamps, it is transferred to the irradiation area of ​​the second drying device 4 along the central impression cylinder 1. At this time, at least two mercury lamps 41 are started simultaneously to irradiate along the width direction of the substrate 5, ensuring that the ink layer of the entire width of the substrate 5 can be uniformly and deeply cured.

[0034] The outer circumference of the central impression cylinder 1 is covered with a silicone layer. The silicone layer is a heat-resistant material used to improve the adhesion between the substrate 5 and the central impression cylinder 1 and reduce slippage during the transmission process. When the substrate 5 is conveyed to the central impression cylinder 1 by the feeding traction device, the elasticity of the silicone layer can adapt to the slight thickness fluctuations of the substrate 5, so that the substrate 5 is tightly attached to the cylinder surface, avoiding printing misregistration caused by gaps during the transmission process.

[0035] It also includes a general control system, which is electrically connected to the drive mechanism of the first drying device 3, the second drying device 4, the central impression cylinder 1, the unwinding device 7, and the rewinding device 8 via wires. The general control system is used to independently control the irradiation start and stop and power of the LED-UV lamp and the mercury lamp 41, and to coordinate the control of the rotation speed of the central impression cylinder 1, the unwinding device 7, and the rewinding device 8 to adapt to the curing requirements of different substrates 5 and different types of inks.

[0036] In summary, the overall control system coordinates and regulates the unwinding device 7, the central impression cylinder 1, the printing ink units 2, the first drying device 3, the second drying device 4, and the rewinding device 8 to operate synchronously. After the substrate 5 is released by the unwinding device 7, it is conveyed to the surface of the central impression cylinder 1, which is wrapped with a silicone layer, and tightly adhered. As the cylinder rotates, it passes through seven spaced printing ink units 2 to complete multi-color overprinting. After each printing ink unit 2 is overprinted, the corresponding LED-UV lamp on the rear end is activated to perform preliminary curing of the wet ink layer to fix its shape and prevent color mixing and smudging. After the substrate 5 has completed all ink unit overprinting and preliminary curing, it is transferred to the irradiation area of ​​the second drying device 4. The mercury lamps 41, arranged in a straight line along the axis of the central impression cylinder 1 with no blind spots, emit highly penetrating ultraviolet light to deeply cure the substrate 5. Finally, the deeply cured substrate 5 is conveyed to the rewinding device 8 by the take-up traction device for neat winding.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system, comprising a base (6) and a first drying device (3), wherein a central impression cylinder (1) is rotatably disposed within the base (6), and a plurality of printing color groups (2) are arranged at intervals on the outer periphery of the central impression cylinder (1), characterized in that: The first drying device (3) includes several LED-UV lamps, which are respectively connected to several printing color groups (2) one by one and installed at the rear end of the corresponding printing color group (2) along the transmission direction. They are used to pre-cur the printed substrate (5). The LED-UV lamps are used to sequentially light-cur the printed substrate (5) after printing by the several printing color groups (2) that have passed through the central impression roller (1). A second drying device (4) is also installed on the base (6). The second drying device (4) includes a mercury lamp (41), which is used to irradiate the substrate (5) after it has been initially cured by all the first drying devices (3) to achieve deep curing of the ink.

2. The satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system according to claim 1, characterized in that: It also includes a winding device (8) and an unwinding device (7) set on the machine base (6). The unwinding device (7) is used in the printing process to release the substrate (5) to be printed, and the winding device (8) is set on the machine base (6) in the printing process to wind up the solidified substrate (5).

3. The satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system according to claim 2, characterized in that: It also includes a traction unit, which includes a feeding traction device and a receiving traction device, both of which can be rotatably mounted on the machine base (6).

4. The satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system according to claim 3, characterized in that: The first drying device (3) includes 7 LED-UV lamps, and the printing color group (2) is provided with 7 lamps. The irradiation area of ​​the 7 LED-UV lamps corresponds to the overprinting area of ​​the corresponding printing color group (2).

5. The satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system according to claim 4, characterized in that: The peak wavelength of the LED-UV lamp is 365nm or 395nm, which is suitable for the surface curing reaction requirements of ink.

6. The satellite-type flexographic printing press LED-UV and mercury lamp hybrid curing system according to claim 1, characterized in that: The number of mercury lamps (41) is at least 2. Several mercury lamps (41) are arranged in a row along the axis of the central impression cylinder (1) on the machine base (6) to ensure that there is no blind spot in the width direction of the printed material (5).

7. The satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system according to claim 1, characterized in that: The outer circumferential surface of the central impression roller (1) is covered with a silicone layer to improve the adhesion between the substrate (5) and the central impression roller (1) and reduce slippage during transmission.

8. The satellite-type flexographic printing machine LED-UV and mercury lamp hybrid curing system according to claim 2, characterized in that: It also includes a general control system, which is electrically connected to the drive mechanism of the first drying device (3), the second drying device (4), the central impression cylinder (1), the unwinding device (7), and the rewinding device (8) via wires. It is used to independently control the start and stop of the LED-UV lamp and the power of the mercury lamp (41), and to coordinate the control of the rotation speed of the central impression cylinder (1), the unwinding device (7), and the rewinding device (8) to adapt to the curing requirements of different substrates (5) and different types of inks.

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