LED-UV curing system for high speed web press

Abstract

The utility model discloses a LED-UV curing system for high -speed rotary machine. The utility model relates to curing system technical field, and this includes frame, control system and at least 1 curing unit of installing on the frame, the curing unit includes first curing module and second curing module, first curing module and second curing module all are provided with LED-UV lamp and cooling system, and first, second curing module is distributed along the L shape transmission path of the printing material before and after, and the LED-UV lamp in each curing module is opposite arrangement with cooling system, and the passage for the printing material to pass through is formed between the two, and the printing material passes through the corresponding passage of first curing module, second curing module in proper order, and the LED-UV lamp of first, second curing module acts on the printing material double face in proper order, and the printing material double face is cured. By setting first, second curing module can be cured in proper order to the printing material double face, and the curing demand of adaptation double -sided printing or permeability material is improved production efficiency significantly.

Description

Technical Field

[0001] This utility model relates to the field of curing system technology, specifically to an LED-UV curing system for high-speed rotary machines. Background Technology

[0002] With the development of society, people invented ink to bond objects. However, the curing of ink takes a period of time, during which time the ink is prone to dripping, resulting in poor adhesion. The invention of UV curing machine has greatly solved this problem. UV curing machine uses ultraviolet light to cause UV ink to undergo a polymerization reaction and thus cure it.

[0003] For example, the LED-UV curing rotary printing machine disclosed in Chinese publication CN117601563A uses UV drying lamps in the curing chamber in conjunction with a conveyor belt to complete the drying and curing of the printed material. Although it has certain advantages in terms of environmental protection and efficiency, it has obvious limitations in terms of curing function adaptability and production efficiency.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: the curing structure of the equipment can only achieve curing of one side of the substrate, but it is difficult to achieve orderly and sufficient curing of both sides of the substrate. It can only meet the single-sided curing requirement and cannot be adapted to double-sided printing or deep curing of the front and back sides by penetrating materials. This results in the need for additional processes or repeated curing to complete double-sided processing, which not only prolongs the production process, but also easily causes deformation of the substrate or uneven curing due to multiple processing. In view of this, an LED-UV curing system for high-speed rotary machines is proposed to solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides an LED-UV curing system for high-speed rotary machines, thereby solving the problems mentioned in the background section.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a device comprising a frame, a control system, and at least one curing unit mounted on the frame; the curing unit includes a first curing module and a second curing module; both the first and second curing modules are equipped with LED-UV lamps and a cooling system, the first and second curing modules are distributed along the L-shaped transport path of the substrate, and the LED-UV lamps and cooling systems in each curing module are arranged opposite to each other, forming a channel for the substrate to pass through; the substrate passes through the corresponding channels of the first and second curing modules in sequence, so that the LED-UV lamps of the first and second curing modules act on both sides of the substrate in sequence to cure both sides of the substrate, and the cooling system is used to cool the surface of the substrate after drying to avoid overheating; the control system is electrically connected to the LED-UV lamps and the cooling system, and is used to steplessly adjust the output power of the UV light source according to the running speed of the rotary machine.

[0009] As a further preferred embodiment, the LED-UV lamp has an LED chip array structure, and the rated power of a single LED-UV lamp is not less than 18kW.

[0010] As a further preferred embodiment, the first curing module contains at least one LED-UV lamp, and the second curing module contains at least one LED-UV lamp.

[0011] As a further preferred embodiment, the LED-UV lamp has a peak wavelength of 385nm to meet the drying requirements of UV inks.

[0012] As a further preferred embodiment, the cooling system includes a cold water plate disposed at the location corresponding to the LED-UV lamp, with an inlet pipe and an outlet pipe respectively disposed on the side wall of the cold water plate, and a refrigeration unit disposed on the outside of the frame for forming a circulating cooling loop with the inlet pipe and the outlet pipe.

[0013] As a further preferred embodiment, the cooling system is equipped with a water solenoid valve on the water inlet pipe to control the on / off state of the coolant and regulate its flow rate, adapting to the heat dissipation requirements under different drying power levels.

[0014] As a further preferred embodiment, the curing unit is provided with a safety protection mechanism with an interlock switch on the outside, which is used to control the system to automatically cut off the power supply of the LED-UV lamp to prevent UV light leakage.

[0015] As a further preferred embodiment, the device further includes at least one set of paper transfer rollers, which are arranged on the L-shaped transport path of the substrate between the first curing module and the second curing module. The paper transfer rollers are rotatably connected to the frame and are used to stably transport the substrate after it has been cured on the front side of the first curing module to the reverse curing station of the second curing module.

[0016] (III) Beneficial Effects

[0017] This invention provides an LED-UV curing system for high-speed rotary machines. It offers the following advantages:

[0018] 1. This LED-UV curing system for high-speed rotary printing presses can sequentially cure both sides of the substrate by setting up first and second curing modules, adapting to the curing needs of double-sided printing or penetrating materials, and significantly improving production efficiency.

[0019] 2. This LED-UV curing system for high-speed rotary printing uses LED-UV lamps with a single rated power of ≥18kW. The energy output of a single lamp is much higher than that of traditional products. Only a small number of lamps are needed to meet the instantaneous curing energy requirements of ultra-high-speed rotary printing, effectively simplifying the system structure and reducing equipment costs and space occupation.

[0020] 3. This LED-UV curing system for high-speed rotary machines, through the installation of a matching water cooling system, can quickly remove the heat generated by the LED chip and reflector, which not only ensures the service life of the LED device and the stability of the optical system, but also prevents the substrate from burning or deforming due to overheating, thus ensuring the curing quality.

[0021] The control system can steplessly adjust the LED output power according to the speed of the rotating machine, and achieve on-demand power supply while maintaining a constant light energy density, thus greatly reducing energy consumption. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a side view of the present invention.

[0024] Figure 3 This is a side sectional view of the structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the cooling system of this utility model;

[0026] Figure 5 This utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0027] In the diagram: 1. Frame; 2. Substrate; 3. First curing module; 4. Second curing module; 5. LED-UV lamps 5a, 5b, 5c, 5d; 6. Cooling system; 61. Cold water plate; 62. Water inlet pipe; 63. Water outlet pipe; 64. Refrigeration unit; 7. Safety protection mechanism. Detailed Implementation

[0028] 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.

[0029] like Figure 1-2 and Figure 4 As shown, this utility model provides a technical solution: a device including a frame 1, a control system, and at least one curing unit installed on the frame 1.

[0030] The curing unit includes a first curing module 3 and a second curing module 4. Both the first curing module 3 and the second curing module 4 are equipped with LED-UV lamps 5 and a cooling system 6. The first and second curing modules are distributed along the L-shaped transport path of the substrate 2. The LED-UV lamps 5 and the cooling system 6 in each curing module are arranged opposite to each other, forming a channel for the substrate 2 to pass through. The substrate 2 passes through the corresponding channels of the first curing module 3 and the second curing module 4 in sequence, so that the LED-UV lamps 5 of the first and second curing modules act on both sides of the substrate 2 in sequence to cure both sides of the substrate 2. The cooling system 6 is used to cool the surface of the substrate 2 after drying to prevent the substrate 2 from overheating. After the cooling plate 61 removes the heat from the surface of the substrate 2, it flows back to the refrigeration unit 64 through the water outlet pipe 63 for circulating cooling, thereby cooling the surface of the substrate 2 to prevent overheating and deformation.

[0031] The control system is electrically connected to the LED-UV lamp 5 and the cooling system 6, and is used to steplessly adjust the output power of the UV light source according to the running speed of the rotary machine. After the frame 1 is fixed, the substrate 2 enters the transmission channel of the curing unit on the frame 1 along the L-shaped path. The control system sends a command to the LED-UV lamp 5 according to the real-time received spindle encoder speed signal. The LED-UV lamp 5 outputs UV light with matching power to instantly cure the front side of the substrate 2.

[0032] After the front side is cured, the substrate 2 turns along the L-shaped path and enters the working range of the second curing module 4. The control system synchronously adjusts the power of the LED-UV lamp 5 on the second curing module 4 to continue curing the reverse side of the substrate 2, ensuring that the curing strength of both sides is consistent.

[0033] Among them, the LED-UV lamp 5 is an LED chip array structure. The rated power of a single LED-UV lamp 5 is not less than 18kW. It uses multiple high-power LED chips, which are arranged closely together and emit light in concert to achieve high power output.

[0034] Meanwhile, the first curing module 3 includes at least one LED-UV lamp 5a and 5b, and the second curing module 4 includes at least one LED-UV lamp 5c and 5d.

[0035] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0036] Furthermore, the LED-UV lamp has a peak wavelength of 385nm, which is used to adapt to the drying requirements of UV inks.

[0037] Specifically, the curing unit is equipped with a safety protection mechanism 7 with an interlock switch on the outside, which is used to control the system to automatically cut off the power supply of the LED-UV lamp 5 to prevent UV light leakage. The safety protection mechanism 7 is a wrap-around cover made of UV-resistant transparent acrylic, which allows observation of the internal working conditions and covers the entire curing unit, the first and second modules, the LED-UV lamp 5, and some pipelines.

[0038] The interlocking switch is a mechanical limit switch installed at the opening and closing point of the protective cover: when the cover is closed, the switch is pressed and is in the conductive state. When the cover is opened, the switch resets and is in the disconnected state, preventing UV light leakage from causing harm to the human body.

[0039] It also includes at least one set of paper transfer rollers, which are arranged on the L-shaped transport path of the substrate 2 between the first curing module 3 and the second curing module 4. The paper transfer rollers are rotatably connected to the frame 1 and are used to stably transport the substrate 2 after it has been cured on the front side of the first curing module 3 to the reverse curing station of the second curing module 4.

[0040] like Figure 1-3 As shown, this utility model provides a technical solution: the cooling system 6 includes a cold water plate 61 disposed at the corresponding position of the LED-UV lamp 5. The cold water plate 61 is made of aluminum alloy, which has a high thermal conductivity and has a serpentine flow channel inside to increase the contact area of ​​the coolant. A channel is left between the cold water plate 61 and the LED-UV lamp 5 for the substrate 2 to pass through, which does not affect the transmission of the substrate 2 and allows the cold water plate 61 to indirectly dissipate heat from the substrate 2. The side wall of the cold water plate 61 is respectively provided with an inlet pipe 62 and an outlet pipe 63. A refrigeration unit 64 is disposed on the outside of the frame 1 for forming a circulating cooling loop with the inlet pipe 62 and the outlet pipe 63. The refrigeration unit 64 is an industrial-grade water-cooled refrigeration unit.

[0041] The side of the cold water plate 61 facing the substrate 8 is used to cool the surface of the substrate 8 during the transfer process, so as to prevent the substrate 8 from burning or deforming due to excessive heat generated by the curing of the LED-UV lamp 5.

[0042] The cooling system 6 has a water inlet pipe 62 equipped with a water solenoid valve to control the on / off state and flow rate of the coolant, adapting to the heat dissipation requirements under different drying power.

[0043] When in use, after the refrigeration unit 64 is started, the coolant flows into the serpentine channels of each cooling plate 61 through the branch valves of the inlet pipe 62. In the channels, the coolant absorbs the heat conducted to the cooling plate 61 by the LED-UV lamp 5. The coolant that has absorbed the heat is collected through the outlet pipe 63 and flows back to the refrigeration unit 64 for cooling again, forming a closed loop.

[0044] The cold water plate 61 has a built-in temperature sensor to monitor the plate temperature in real time.

[0045] In summary, this LED-UV curing system for a high-speed rotary press is fixed to the printing unit of the rotary press via frame 1. First, the control system receives the real-time speed signal from the rotary press spindle encoder, preloads the UV power curve corresponding to the speed, and activates the cooling system 6 for pre-cooling. Then, the printed substrate 2 enters the transmission channel of the curing unit on frame 1 along an L-shaped path. The control system, based on the real-time speed stepless adjustment module, can configure the 385nm peak wavelength of each LED-UV lamp 5a and 5b (with a rated power ≥18kW) to match the output power of the corresponding UV ink. Subsequently, the substrate 2 is rotatably connected to frame 1 via the paper transfer roller between the first and second curing modules and is stably rotated and transported to the second curing module 4 position synchronously with the rotary press spindle. The control system synchronously adjusts the power of the LED-UV lamps 5c and 5d within the module to continuously cure the reverse side of the substrate 2. During the curing process, the cooling system 6 adjusts the coolant flow rate as needed via a solenoid valve on the inlet pipe 62. The coolant passes through the cooling plate 61, which carries away heat from the surface of the substrate 2. The coolant then flows back to the refrigeration unit 64 along the outlet pipe 63 for circulating cooling, thus reducing the surface temperature of the substrate 2 to prevent overheating, burning, or deformation. During operation, the control system continuously optimizes the LED-UV lamp power and cooling flow rate based on the spindle speed, ensuring that the substrate 2 maintains a constant brightness density under ultra-high-speed transmission, achieving a double-sided, orderly, high-quality, safe, and energy-efficient curing effect.

[0046] It should be noted that all electrical components mentioned in this article are electrically connected to an external main controller and 220V or 380V AC mains power. The main controller can be a conventional, known device such as a computer, and its control principles, internal structure, and control switching methods are all conventional methods of existing technology. These are directly cited here without further elaboration. In this document, relational terms such as "first" and "second" are used merely 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.

[0047] 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. An LED-UV curing system for a high-speed rotary machine, comprising a frame (1), a control system, and at least one curing unit mounted on the frame (1); characterized in that, The curing unit includes a first curing module (3) and a second curing module (4); both the first curing module (3) and the second curing module (4) are equipped with LED-UV lamps (5) and a cooling system (6). The first and second curing modules are distributed along the L-shaped transport path of the substrate (2). The LED-UV lamps (5) and the cooling system (6) in each curing module are arranged opposite to each other, forming a channel for the substrate (2) to pass through. The substrate (2) passes through the corresponding channels of the first curing module (3) and the second curing module (4) in sequence, so that the LED-UV lamps (5) of the first and second curing modules act on both sides of the substrate (2) in sequence to cure both sides of the substrate (2). The cooling system (6) can prevent the substrate (2) from overheating. The control system is electrically connected to the LED-UV lamps (5) and the cooling system (6) and is used to steplessly adjust the output power of the UV light source according to the running speed of the rotary machine.

2. The LED-UV curing system for a high-speed rotary machine according to claim 1, characterized in that: The LED-UV lamp (5) is an LED chip array structure, and the rated power of a single LED-UV lamp (5) is not less than 18kW.

3. The LED-UV curing system for a high-speed rotary machine according to claim 2, characterized in that: The first curing module (3) contains at least one LED-UV lamp (5a, 5b), and the second curing module (4) contains at least one LED-UV lamp (5c, 5d).

4. The LED-UV curing system for a high-speed rotary machine according to claim 3, characterized in that: The LED-UV lamp (5) has a peak wavelength of 385nm, which is used to adapt to the drying requirements of UV ink.

5. The LED-UV curing system for a high-speed rotary machine according to claim 1, characterized in that: The cooling system (6) includes a cold water plate (61) located at the corresponding position of the LED-UV lamp (5). The side wall of the cold water plate (61) is provided with an inlet pipe (62) and an outlet pipe (63). A refrigeration unit (64) is provided on the outside of the frame (1) for forming a circulating cooling loop with the inlet pipe (62) and the outlet pipe (63).

6. The LED-UV curing system for a high-speed rotary machine according to claim 5, characterized in that: The cooling system (6) is equipped with a water solenoid valve on the water inlet pipe (62) to control the on / off state of the coolant and adjust the flow rate to meet the heat dissipation requirements under different drying power.

7. The LED-UV curing system for a high-speed rotary machine according to claim 1, characterized in that: The curing unit is equipped with a safety protection mechanism (7) with an interlock switch on the outside, which is used to control the system to automatically cut off the power supply of the LED-UV lamp (5) to prevent UV light leakage.

8. The LED-UV curing system for a high-speed rotary machine according to claim 1, characterized in that: It also includes at least one set of paper transfer rollers, which are arranged on the L-shaped transmission path of the substrate (2) between the first curing module (3) and the second curing module (4). The paper transfer rollers are rotatably connected to the frame (1) and are used to stably transmit the substrate (2) after it has been cured on the front side of the first curing module (3) to the reverse curing station of the second curing module (4).

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