Cold solid ink printing dampening and drying improved device and control method

Abstract

The invention relates to the technical field of printing, in particular to a cold solid ink printing dampening and drying improved device and a control method.The cold solid ink printing dampening and drying improved device comprises a first dampening liquid supply system for storing and providing common dampening liquid, a second dampening liquid supply system for storing and providing quick-drying dampening liquid, and a dampening device comprises a dampening liquid tank and a dampening roller assembly; the fountain solution switching system selectively guides a common fountain solution or a quick-drying fountain solution into a fountain solution tank, the ink supply system comprises a transfer ink roller assembly, the fountain roller assembly and the transfer ink roller assembly are in rolling abutting connection to transfer ink and the fountain solution to a printing unit, and the fountain solution switching system switches the first fountain solution supply system to supply solution before shutdown; the invention further comprises a control method adopting the device, and the common fountain solution or the quick-drying fountain solution is selectively guided in according to the running state of the printing machine. The fountain solution is flexibly replaced according to the running state of the printing machine, ink drying and hardening during shutdown are avoided, the printing quality and efficiency are guaranteed, and the cold solid ink printing drying process is optimized.

Description

Technical Field

[0001] This application relates to the field of printing technology, and in particular to an improved apparatus and control method for cold ink curing printing dampening and drying. Background Technology

[0002] The field of printing technology plays a vital role in modern social development, with widespread applications in numerous industries such as publishing, advertising, and packaging. As the demand for information dissemination continues to grow, the quality and production efficiency of printed materials are receiving increasing attention.

[0003] In traditional cold-set ink printing methods, the printing press is typically equipped with a damping system, including a damping tank and a standard damping solution. When operating at low speeds (e.g., below 20,000 rpm) or printing products with small ink volumes, this configuration can assist ink drying to some extent through the emulsification of the damping solution and ink, generally meeting production needs.

[0004] However, as market demands for printing efficiency continue to rise, printing presses require increasingly higher speeds. When printing presses operate at high speeds (e.g., 30,000-40,000 rpm) or handle large-volume overprinting, the inherent limitations of existing technology become apparent: the drying capacity of ordinary dampening solutions is insufficient to meet the requirement for rapid ink fixation on paper. This leads to back-side smudging (where ink doesn't dry in time and sticks to the next sheet after printing, causing paper smudges and contamination) during paper stacking, severely impacting product quality. To alleviate this problem, sheet-fed printing presses have to use large amounts of powder, causing severe dust pollution and increasing equipment maintenance costs; while rotary book and magazine printing presses cannot use powder spraying, making the smudging problem even more pronounced. To solve the high-speed drying problem, the industry has attempted to change ink types, such as using thermosetting UV inks. However, both solutions have significant drawbacks: thermosetting inks require large drying equipment, resulting in high energy consumption and significant VOC emissions, which contradicts the trend of green printing; UV inks and their associated UV curing equipment are expensive, and the ink splattering phenomenon of UV inks is corrosive to the equipment. In addition, some technical solutions propose using fast-drying dampening solutions. However, while replacing ordinary dampening solutions with fast-drying ones solves the drying problem during high-speed printing, it introduces new issues: when the printing press slows down, pauses, or stops for maintenance, the fast-drying dampening solution causes the ink on the ink supply system (such as ink rollers, blankets, and printing plates) to dry and form a skin too quickly, leading to difficulties in starting up, time-consuming cleaning, and affecting production continuity and stability. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this application provides an improved device and control method for cold-curing ink printing damping and drying. Through two sets of damping solution supply and switching systems, the fast-drying and ordinary damping solutions can be selected as needed. During normal printing, the fast-drying damping solution is used to accelerate drying, while the ordinary damping solution is switched to before stopping the machine. This can effectively prevent the fast-drying damping solution from quickly forming scale on the stationary printing unit, thereby protecting the printing plate and rollers and ensuring equipment reliability and printing quality.

[0006] This application is achieved through the following technical solution: An improved apparatus for cold-curing ink printing damping and drying includes: The first dampening solution supply system is used to store and supply ordinary dampening solution; The second damping solution supply system is used to store and supply fast-drying damping solution; A damping apparatus includes a damping solution tank for receiving damping solution and a damping roller assembly for transferring damping solution from the damping solution tank to a printing unit; A damping solution switching system is installed between the first damping solution supply system and the second damping solution supply system, and is used to selectively introduce ordinary damping solution or fast-drying damping solution into the damping solution tank. An ink supply system includes an ink transfer roller assembly that rolls against a printing unit, and a damping roller assembly that rolls against the ink transfer roller assembly to transfer ink and ordinary damping solution or fast-drying damping solution together onto the printing unit. When the printing unit is stopped or its operating speed is lower than the first preset speed, the dampening solution switching system switches the first dampening solution supply system to supply liquid to the dampening solution tank so that ordinary dampening solution is transferred to the printing unit.

[0007] By adopting the above technical solution, fast-drying dampening solutions can be used during high-speed printing to improve ink drying speed and print quality, while switching back to regular dampening solutions during low-speed printing or when the machine is stopped. Fast-drying dampening solutions typically contain a high proportion of ink resin drying promoters. If used during downtime, this can easily cause the ink to dry rapidly and form a skin on components such as ink rollers and printing plates, increasing cleaning difficulty and potentially damaging the equipment. Switching back to a milder, slower-drying regular dampening solution effectively prevents this problem and protects the printing equipment. Fast-drying dampening solutions are generally more expensive than regular dampening solutions and have a stronger ink drying ability. Using them only during necessary high-speed printing stages can save costs and reduce the impact on printing efficiency.

[0008] Optionally, an anti-skinning mechanism is installed beside the transfer ink roller assembly. The anti-skinning mechanism includes a nozzle and a drive assembly. The nozzle is positioned facing the roller surface of the transfer ink roller assembly and is used to spray an anti-skinning agent. The drive assembly is connected to the nozzle and is used to drive the nozzle to move axially along the transfer ink roller assembly.

[0009] By adopting the above technical solution, the formation of dried ink skin on the ink surface due to oxidation or solvent evaporation during prolonged downtime can be effectively prevented, ensuring the stability and continuity of printing quality. This avoids the problems of smudges and increased scrap rates in printed materials caused by ink skin contaminating the ink system.

[0010] Optionally, a foam treatment mechanism is provided at the opening of the dampening liquid tank and on the side near the dampening roller assembly. The foam treatment mechanism is used to scrape off and transfer the foam adhering to the surface of the dampening roller assembly.

[0011] By employing the above technical solution, foam is easily generated during the circulation of dampening solution and its high-speed contact with the ink roller. This foam removal mechanism is specifically designed to scrape off and transfer this foam adhering to the surface of the dampening roller. Foam affects the uniform transfer of dampening solution, leading to uneven water application to the printing plate, which in turn causes problems such as "smudges" (ink getting into non-image areas) on the printed matter. Removing foam ensures that the dampening solution is transferred evenly and stably to the printing plate, thereby guaranteeing the cleanliness and quality of the printed matter.

[0012] Optionally, the foam treatment mechanism includes a scraper and a suction component disposed on the scraper. A scraping gap is reserved between the side of the scraper and the dampening roller assembly. The scraping gap is used to prevent the foam from rotating with the dampening roller assembly and to retain the dampening liquid. The suction port of the suction component faces the side of the scraper that intercepts the foam and is used to suck away the foam scraped off by the scraper.

[0013] By employing the above technical solution, the scraper utilizes a pre-reserved micro-gap to physically separate larger foam particles from the dampening solution. The suction assembly actively draws away the foam intercepted by the scraper and discharges it from the system. Compared to manual foam removal, this "scraping and suction" method achieves automated continuous processing, resulting in higher efficiency and a more thorough effect. Directly suctioning the foam into the waste liquid system avoids the foam from re-mixing into the dampening solution tank after bursting, resulting in cleaner processing. Simultaneously, during the separation of the dampening solution from the foam, the scraper allows the dampening solution on the dampening roller assembly to return to the dampening solution tank, preventing waste. The scraper also evenly distributes the dampening solution on the dampening roller assembly, preventing it from being wetly transferred to the assembly, thus facilitating subsequent printing.

[0014] Optionally, the scraper is inclined downward along the height direction so that the scraped foam flows along the scraper to the target position and is then sucked up by the suction component.

[0015] By adopting the above technical solution, gravity is used to allow the foam intercepted by the scraper to automatically flow along the inclined plate surface to a concentrated location. This gathers the dispersed foam near the suction port of the suction component, making the suction operation more focused and efficient. It avoids the need to move or install multiple suction ports, thus simplifying the structure.

[0016] Optionally, a cleaning system may also be included, the cleaning system including a cleaning pipeline connected to the dampening bath for introducing the cleaning medium into the dampening bath.

[0017] By adopting the above technical solution, a dedicated pipeline for injecting cleaning solution into the dampening system during the maintenance of the water tank and water bath dampening system during shutdown was established, which reduced the tediousness and time of manual operation and improved work efficiency.

[0018] Optionally, the end of the cleaning pipeline is provided with multiple sets of nozzles, which are spaced apart and facing the roller surface of the dampening roller assembly, for spraying and cleaning the dampening roller assembly.

[0019] By employing the above technical solution, the cleaning medium is sprayed directly and evenly onto the surface of the dampening roller. The spraying method provides better cleaning than simple immersion, effectively removing ink, paper dust, and other contaminants accumulated on the roller surface using impact force. The multi-nozzle spacing ensures that the entire roller surface is cleaned without any blind spots, resulting in a more thorough and faster cleaning process.

[0020] Optionally, the bottom of the damping solution tank is provided with a drain port, and a drain solenoid valve is connected to the drain port. A waste liquid collection tank is provided below the drain solenoid valve. The waste liquid collection tank is used to collect the ordinary damping solution or quick-drying damping solution remaining in the damping solution tank before the damping solution switching system is switched.

[0021] By adopting the above technical solution, the residual old solution in the tank can be drained before switching between ordinary damping solution and fast-drying damping solution, avoiding the mixing of two liquids with different properties, thus ensuring that the performance of the newly added damping solution is not affected. Combined with a cleaning system, the "draining, cleaning, and refilling" process can be automated, making operation convenient and meeting the requirements of environmental protection and clean production.

[0022] Optionally, the dampening solution tank is equipped with a level sensor, which is electrically connected to the first dampening solution supply system or the second dampening solution supply system. The level sensor is used to detect the level of the dampening solution and provide a feedback signal.

[0023] By employing the above technical solution, the actual liquid level in the dampening solution tank is detected in real time. The detected liquid level information is converted into an electrical signal and sent to the control system or dampening solution supply system. When the liquid level is lower than the set value, the system can automatically activate the corresponding supply pump to replenish it; once the set value is reached, it automatically stops. This ensures the stability of the dampening solution supply, avoids printing problems caused by excessively high or low liquid levels, and reduces manual intervention.

[0024] A method for controlling the drying of cold-curing ink printing, employing any of the above-mentioned improved devices, includes the following steps: Depending on the operating status of the printing press, selectively perform one of the following steps: When the printing press is running at a speed lower than the first preset speed or when it is stopped, the dampening solution switching system is controlled to turn on the first dampening solution supply system, turn off the second dampening solution supply system, and introduce ordinary dampening solution into the dampening solution tank. When the printing press switches from the first preset speed or stop to the second preset speed, the damping solution switching system is controlled to shut down the first damping solution supply system, stop the introduction of the ordinary damping solution, and turn on the second damping solution supply system to introduce the fast-drying damping solution into the damping solution tank. When the printing press switches from the second preset speed to the first preset speed or stops, the dampening solution switching system is controlled to shut down the second dampening solution supply system, stop the introduction of the fast-drying dampening solution, and turn on the first dampening solution supply system to introduce ordinary dampening solution into the dampening solution tank.

[0025] By adopting the above technical solution, the operator's experience and judgment are transformed into automatic machine execution, ensuring that the most suitable dampening solution is used at the most appropriate time. Through this intelligent control, the method guarantees drying effect and product quality at high-speed printing, while maximizing equipment protection, saving costs, and reducing pollution at low speeds and during shutdown, achieving the best balance between printing efficiency, equipment lifespan, and economic and environmental benefits.

[0026] In summary, this application includes at least one of the following beneficial technical effects: This application enables the switching of dampening solution type according to the printing press's operating status. When operating at high speed or processing large ink volume overprinted works, a fast-drying dampening solution is used to quickly fix the ink and prevent the back of the printed matter from being smudged. Before stopping the machine, a regular dampening solution is used to prevent the ink in the printing unit from drying quickly and forming ink skin after the machine stops, ensuring uniform ink transfer and clear patterns when the machine is restarted. This application uses an anti-skinning mechanism to spray an anti-skinning agent onto the ink transfer roller assembly and move it axially to prevent ink skin from forming during ink transfer, thereby reducing the amount of manual cleaning and maintenance work. This application utilizes a foam treatment mechanism to scrape and transfer foam from the surface of the dampening roller assembly, ensuring printing quality and efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 yes Figure 1 A sectional view; Figure 3 yes Figure 2 An enlarged diagram of A in the diagram.

[0028] In the diagram: 1. First dampening solution supply system; 2. Second dampening solution supply system; 3. Damping device; 31. Damping solution tank; 311. Drain outlet; 312. Drain solenoid valve; 32. Damping roller assembly; 4. Printing unit; 5. Damping solution switching system; 6. Ink supply system; 61. Transfer ink roller assembly; 7. Anti-ink skin mechanism; 71. Printhead; 72. Drive assembly; 8. Foam treatment mechanism; 81. Scraper; 82. Suction assembly; 9. Cleaning system; 91. Cleaning pipeline; 911. Nozzle; 10. Waste liquid collection tank; 11. Liquid level sensor. Detailed Implementation

[0029] The following will be combined with the appendix Figure 1-3 The technical solutions of the various embodiments of this application have been clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example

[0030] Reference Figure 1 and Figure 2 This application discloses an improved damping and drying device for cold-curing ink printing, including a first damping solution supply system 1, a second damping solution supply system 2, a damping device 3, a damping solution switching system 5, and an ink supply system 6. The first damping solution supply system 1 is used to store and provide ordinary damping solution; the second damping solution supply system 2 is used to store and provide fast-drying damping solution; the damping device 3 includes a damping solution tank 31 for receiving damping solution and a damping roller assembly 32 for transferring damping solution from the damping solution tank 31 to the printing unit 4; the damping solution switching system 5 is disposed between the first damping solution supply system 1 and the second damping solution supply system 2, and is used to selectively introduce ordinary damping solution or fast-drying damping solution into the damping solution tank 31; the ink supply system 6 includes a transfer ink roller assembly 61, which rolls against the printing unit 4, and the damping roller assembly 32 rolls against the transfer ink roller assembly 61 to transfer ink and ordinary damping solution or fast-drying damping solution together onto the printing unit 4.

[0031] Specifically, the first dampening solution supply system 1 includes a storage container for storing ordinary dampening solution and delivery pipelines. The storage container can be a large plastic drum or a stainless steel tank, used to stably store the ordinary dampening solution. The delivery pipeline can be a rubber hose or a plastic hose, used to pump the ordinary dampening solution out of the storage container. Optionally, when the ordinary dampening solution in the storage container is insufficient, a weighing alarm mechanism can be installed at the bottom of the first dampening solution system to monitor the ordinary dampening solution content in the storage container in real time and supply more solution when it is insufficient.

[0032] The second dampening solution supply system 2 includes a storage container for storing the quick-drying dampening solution and delivery pipelines. The storage container can be a plastic bucket or a stainless steel tank, and must have good sealing properties to prevent the quick-drying dampening solution from evaporating or deteriorating. The delivery pipeline can also be a rubber hose or a plastic hose, capable of accurately delivering the quick-drying dampening solution to the dampening device 3. Optionally, when the quick-drying dampening solution in the storage container is insufficient, a weighing alarm mechanism can be installed at the bottom of the second dampening solution system to monitor the quick-drying dampening solution content in the storage container in real time and supply more solution when needed.

[0033] The damping device 3 includes a damping solution tank 31 and a damping roller assembly 32. The damping solution tank 31 receives the damping solution and is made of stainless steel or aluminum alloy, offering good corrosion resistance. The damping roller assembly 32 consists of multiple rollers, such as metering rollers and fountain rollers. The metering roller precisely controls the amount of damping solution delivered, and its surface can undergo special treatments, such as chrome plating, to improve surface smoothness and wear resistance. The fountain roller transfers the damping solution from the damping solution tank 31 to the printing unit 4. It works in conjunction with the metering roller, achieving the transfer of damping solution through rolling contact.

[0034] The dampening solution switching system 5 is located between the first dampening solution supply system 1 and the second dampening solution supply system 2, and can employ control components such as solenoid valves. The solenoid valves can selectively open or close corresponding channels according to control signals, thereby introducing ordinary dampening solution or quick-drying dampening solution into the dampening solution tank 31. When the printing press requires ordinary dampening solution, the solenoid valve opens the channel of the first dampening solution supply system 1 and closes the channel of the second dampening solution supply system 2; and vice versa.

[0035] The ink transfer roller assembly 61 can consist of multiple ink rollers, such as an inking roller, a leveling roller, and a water-based ink roller. The inking roller transfers ink to the printing unit 4; its surface is typically made of rubber, providing excellent ink absorption and transfer properties. The leveling roller distributes ink evenly; its surface can be made of metal, and it achieves ink homogenization through rolling contact with other ink rollers. The water-based ink roller rolls roll in contact with the dampening roller to indirectly transfer the dampening solution in the dampening bath 31 to the water-based ink roller. When the dampening roller assembly 32 rolls into contact with the ink transfer roller assembly 61, the dampening solution and ink mix during the contact process and are then transferred together to the printing unit 4.

[0036] Before the printing unit 4 stops, the dampening solution switching system 5 switches the first dampening solution supply system 1 to supply liquid to the dampening solution tank 31, so that the ordinary dampening solution is transferred to the printing unit 4, avoiding the quick-drying dampening solution from causing the ink to dry too quickly and forming a dry ink skin, which would affect the subsequent printing quality.

[0037] Optional, refer to Figure 1 and Figure 3 The damping solution tank 31 is equipped with a level sensor 11, which is electrically connected to the first damping solution supply system 1 or the second damping solution supply system 2. The level sensor 11 is used to detect the level of the damping solution and provide a feedback signal.

[0038] Preferred, refer to Figures 2-3 The bottom of the damping solution tank 31 is provided with a drain port 311, and a drain solenoid valve 312 is connected to the drain port 311. A waste liquid collection tank 10 is provided below the drain solenoid valve 312. The waste liquid collection tank 10 is used to collect the ordinary damping solution or quick-drying damping solution remaining in the damping solution tank 31 before the damping solution switching system 5 is switched.

[0039] Preferred, refer to Figure 1 and Figure 3 A foam treatment mechanism 8 is provided at the opening of the dampening liquid tank 31 and on the side near the dampening roller assembly 32. The foam treatment mechanism 8 is used to scrape off and transfer the foam adhering to the surface of the dampening roller assembly 32.

[0040] Reference Figure 3 The foam treatment mechanism 8 includes a scraper 81 and a suction component 82 disposed on the scraper 81. A scraping gap is reserved between the side of the scraper 81 and the dampening roller assembly 32. The scraping gap is used to block the foam from rotating with the dampening roller assembly 32 and to retain the dampening liquid. The suction port of the suction component 82 faces the side of the scraper 81 that intercepts the foam and is used to suck away the foam scraped off by the scraper 81.

[0041] The scraper 81 is inclined downward along the height direction so that the scraped foam flows along the scraper 81 to the target position and is then sucked away by the suction component 82.

[0042] The scraper 81 can be made of rubber, which has moderate hardness, effectively removing foam without damaging the surface of the dampening roller assembly 32. A scraping gap is provided between the side of the scraper 81 and the dampening roller assembly 32. This gap can be adjusted according to actual conditions, generally controlled within a small range, which can prevent foam from rotating with the dampening roller assembly 32 while allowing dampening solution to pass through. The suction assembly 82 can be a small vacuum pump and a suction nozzle, with the nozzle facing the side of the scraper 81 that intercepts the foam. After the scraper 81 scrapes off the foam, the suction assembly 82 can promptly suck it away. To allow the foam to flow better towards the suction nozzle, the scraper 81 is tilted downwards along its height. The scraped foam will flow along the scraper 81 to the target position and then be sucked away by the suction assembly 82.

[0043] Preferred, refer to Figure 1 It also includes a cleaning system 9, which includes a cleaning pipeline 91 connected to a dampening solution tank 31 for introducing the cleaning medium into the dampening solution tank 31.

[0044] Reference Figure 1 and Figure 2 The end of the cleaning pipe 91 is provided with multiple sets of nozzles 911, which are spaced apart and facing the roller surface of the dampening roller assembly 32, for spraying and cleaning the dampening roller assembly 32.

[0045] The cleaning pipeline 91 can be a rubber tube, with multiple sets of nozzles 911 at its end. The nozzles 911 are conical nozzles 911, which are spaced apart and facing the roller surface of the dampening roller assembly 32. When the dampening roller assembly 32 needs to be cleaned, a cleaning medium, such as clean water or a special cleaning agent, is introduced into the dampening liquid tank 31 through the cleaning pipeline 91, and then the dampening roller assembly 32 is sprayed and cleaned through the nozzles 911.

[0046] Preferred, refer to Figures 1-2 An anti-skinning mechanism 7 is installed on the side of the transfer ink roller assembly 61. The anti-skinning mechanism 7 includes a nozzle 71 and a drive assembly 72. The nozzle 71 is positioned facing the roller surface of the transfer ink roller assembly 61 and is used to spray an anti-skinning agent. The drive assembly 72 is connected to the nozzle 71 and is used to drive the nozzle 71 to move axially along the transfer ink roller assembly 61.

[0047] The nozzle 71 can be an atomizing nozzle 71, which can evenly spray the anti-skinning agent onto the roller surface of the transfer ink roller assembly 61. The nozzle 71 can be made of metal, which has good corrosion resistance. The drive assembly 72 can be a cylinder. The cylinder drives the nozzle 71 to move axially along the transfer ink roller assembly 61. This ensures that the anti-skinning agent can fully cover the roller surface of the transfer ink roller assembly 61, effectively preventing the formation of dried ink skin on the ink surface due to oxidation or solvent evaporation during long-term downtime.

[0048] The implementation principle of this embodiment is as follows: the traditional single damping system is "divided into two," establishing two independent supply systems to store damping solutions with different functions (a slow-drying ordinary type and a fast-drying quick-drying type). The damping solution switching system 5 acts as the control center, selecting one damping solution from the others and introducing it into the shared damping solution tank 31 according to instructions. This achieves "functional separation and on-demand supply," fundamentally solving the problem that a single damping solution cannot simultaneously meet the contradictory demands of high-speed drying and low-speed anti-skinning. During high-speed printing, the system introduces the quick-drying damping solution. The quick-drying damping solution is transferred to the printing unit 4 along with the ink. The quick-drying damping solution contains ink resin drying-promoting components that accelerate the curing of the ink on the substrate (such as paper), effectively preventing the "back-side smudging" problem caused by slow drying, thereby ensuring product quality under high-speed production. Before slowing down or stopping the machine, the control system issues an instruction, and the switching system switches the damping solution source to ordinary damping solution. The mild, slow-drying ordinary dampening solution quickly (approximately 30 seconds) replaces the residual fast-drying dampening solution on printing unit 4, maintaining the ink in the entire ink system (ink rollers, printing plate, etc.) at a moderately moist state. This effectively prevents the ink from rapidly drying and forming a skin due to the fast-drying dampening solution, protecting the equipment and preparing it for the next printing run. Simultaneously, the anti-skinning mechanism 7 automatically and repeatedly sprays an anti-skinning agent, forming a protective film on the ink roller surface, further preventing ink oxidation and skinning upon contact with air. The foam removal mechanism 8 automatically removes foam from the dampening solution using a combination of physical scraping and negative pressure suction, ensuring the dampening solution is evenly distributed to the printing plate and avoiding quality defects such as "smudged" printing caused by foam. Example

[0049] This application also discloses a method for controlling the drying of cold-curing ink printing, which uses the improved cold-curing ink printing drying apparatus in Example 1, and includes the following steps: Depending on the operating status of the printing press, selectively perform one of the following steps: When the printing press is operating at a speed lower than the first preset speed or is stopped, the dampening solution switching system 5 is controlled to open the first dampening solution supply system 1 and close the second dampening solution supply system 2, introducing ordinary dampening solution into the dampening solution tank 31. This is because, at low speeds or when the press is stopped, ordinary dampening solution can prevent the ink from drying too quickly and forming a dry ink skin. By controlling components such as solenoid valves, the channel of the first dampening solution supply system 1 is opened, and the channel of the second dampening solution supply system 2 is closed, using pumps or other methods to deliver ordinary dampening solution to the dampening solution tank 31.

[0050] When the printing press switches from the first preset speed or stop to the second preset speed, the dampening solution switching system 5 is controlled to shut off the first dampening solution supply system 1, stopping the introduction of ordinary dampening solution, and to open the second dampening solution supply system 2, introducing fast-drying dampening solution into the dampening solution tank 31. During high-speed operation, the fast-drying dampening solution accelerates ink drying and prevents back-side smudging (when printed paper is stacked, ink may not dry in time and stick to the next sheet, causing paper smudges and contamination). By controlling the solenoid valve to operate in reverse, the channel of the first dampening solution supply system 1 is closed, and the channel of the second dampening solution supply system 2 is opened, delivering the fast-drying dampening solution to the dampening solution tank 31.

[0051] When the printing press switches from the second preset speed to the first preset speed or stops, the dampening solution switching system 5 is controlled to shut down the second dampening solution supply system 2, stopping the introduction of fast-drying dampening solution, and to open the first dampening solution supply system 1, introducing ordinary dampening solution into the dampening solution tank 31. This prevents the ink from drying too quickly when the press is stopped due to the fast-drying dampening solution. The switching of the dampening solution supply system is also achieved by controlling a solenoid valve.

[0052] The implementation principle of this embodiment is as follows: The "printing press operating status" (mainly speed) is used as the input variable for decision-making. It presets two key speed thresholds (first and second preset speeds), dividing the printing process into a "low-speed or stop zone" and a "high-speed zone." The control system (such as a PLC or central computer) automatically executes a preset switching program based on the comparison between the printing press's real-time speed and these two thresholds, replacing manual judgment and operation, thus achieving intelligent control. When switching from low-speed or stop to high-speed: When the printing press speed exceeds the "second preset speed," the system determines that it has entered high-speed production mode. The primary task at this time is to ensure drying speed. Therefore, the control logic triggers a switching action, automatically shutting off the supply of ordinary dampening solution and turning on the supply of fast-drying dampening solution. When switching from high-speed to low-speed or stop: When the printing press speed is lower than the "first preset speed" or a stop signal is received, the system determines that it has entered low-speed or standby mode. The primary task at this time is to protect the equipment and prevent ink drying. Therefore, the control logic triggers a reverse switching, shutting off the supply of fast-drying dampening solution and turning on the supply of ordinary dampening solution. This control logic creates a dynamic response mechanism, ensuring that the characteristics of the dampening solution always match the machine's operational needs. Through this intelligent control method, multiple optimization goals are ultimately achieved: eliminating ink smudging during high-speed printing; avoiding prolonged cleaning and startup preparation due to ink drying during downtime, thus improving production continuity; using the more expensive quick-drying dampening solution only when necessary, reducing consumable costs; and preventing damage to critical components such as ink rollers and printing plates due to ink drying.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this application.

Claims

1. A device for improving the drying of a cold-set ink printed form, characterised in that, The application relates to a printing plate dampening system, which comprises: a first dampening solution supply system (1) for storing and providing common dampening solution; a second dampening solution supply system (2) for storing and providing quick-drying dampening solution; a dampening device (3) comprising a dampening solution tank (31) for receiving dampening solution and a dampening roller assembly (32) for transferring dampening solution from the dampening solution tank (31) to a printing unit (4); a dampening solution switching system (5) arranged between the first dampening solution supply system (1) and the second dampening solution supply system (2) and used for selectively guiding common dampening solution or quick-drying dampening solution into the dampening solution tank (31); an ink supply system (6) comprising a transfer ink roller assembly (61), which is in rolling abutment with the printing unit (4) and in rolling abutment with the dampening roller assembly (32) so as to transfer ink together with common dampening solution or quick-drying dampening solution to the printing unit (4); wherein when the printing unit (4) is in a shutdown state or a running speed is lower than a first preset speed, the dampening solution switching system (5) switches the first dampening solution supply system (1) to supply dampening solution to the dampening solution tank (31) so as to transfer common dampening solution to the printing unit (4).

2. A device for improving the dampening and drying of cold-set ink printing according to claim 1, characterized in that A anti-dry skin mechanism (7) is arranged beside the transfer ink roller assembly (61), the anti-dry skin mechanism (7) comprises a nozzle (71) and a driving assembly (72), the nozzle (71) is arranged towards the roller surface of the transfer ink roller assembly (61) and is used for spraying anti-dry skin agent, the driving assembly (72) is connected with the nozzle (71) and is used for driving the nozzle (71) to move along the axial direction of the transfer ink roller assembly (61).

3. A device for improving the dampening and drying of cold-set ink printing according to claim 1, characterized in that A foam treatment mechanism (8) is arranged at the opening of the dampening solution tank (31) and close to one side of the dampening roller assembly (32), and the foam treatment mechanism (8) is used for scraping and transferring the foam adhered to the surface of the dampening roller assembly (32).

4. A device for improving the dampening and drying of cold-set ink printing according to claim 3, characterized in that The foam treatment mechanism (8) comprises a scraper (81) and a suction assembly (82) arranged on the scraper (81), a scraping gap is reserved between the side edge of the scraper (81) and the dampening roller assembly (32), the scraping gap is used for blocking the foam from rotating with the dampening roller assembly (32) and allowing the dampening solution to pass through, and the suction port of the suction assembly (82) is arranged towards the side of the scraper (81) where the foam is intercepted, and is used for sucking away the foam scraped by the scraper (81).

5. A device for improving the dampening and drying of cold-set ink printing according to claim 4, characterized in that The scraper (81) is arranged to be inclined downward along the height direction, so that the scraped foam flows along the scraper (81) to a target position and is then sucked away by the suction assembly (82).

6. A device for improving the dampening and drying of cold-set ink printing according to claim 1, characterized in that A cleaning system (9) is further arranged, the cleaning system (9) comprises a cleaning pipeline (91) which is in communication with the dampening solution tank (31) and is used for guiding cleaning medium into the dampening solution tank (31).

7. A device for improving the dampening and drying of cold-set ink printing according to claim 6, characterized in that The end of the cleaning pipeline (91) is provided with a plurality of nozzles (911), the nozzles (911) are arranged towards the roller surface of the dampening roller assembly (32) at intervals, and are used for spraying and cleaning the dampening roller assembly (32).

8. A device for improving the dampening and drying of cold-set ink printing according to claim 1, characterized in that The bottom of the dampening solution tank (31) is provided with a drainage port (311), the drainage port (311) is connected with a drainage electromagnetic valve (312), the drainage electromagnetic valve (312) is provided below with a waste liquid collecting tank (10), the waste liquid collecting tank (10) is used for collecting the ordinary dampening solution or the quick-drying dampening solution remaining in the dampening solution tank (31) before the dampening solution switching system (5) switches.

9. A device for improving the dampening and drying of cold-set ink printing according to claim 1, characterized in that The dampening solution tank (31) is provided with a liquid level sensor (11), the liquid level sensor (11) is electrically connected with the first dampening solution supply system (1) or the second dampening solution supply system (2), and the liquid level sensor (11) is used for detecting the dampening solution liquid level and feeding back a signal.

10. A method of controlling the drying of a cold-set ink printing, characterized in that The improved device according to any one of claims 1-9, comprising the following steps: According to the operating state of the printing machine, one of the following steps is selectively executed: When the printing machine is running at a speed lower than a first preset speed or is in a stop state, the dampening solution switching system (5) is controlled to open the first dampening solution supply system (1), close the second dampening solution supply system (2), and guide the ordinary dampening solution into the dampening solution tank (31); When the operating state of the printing machine is switched from the first preset speed or the stop state to a second preset speed, the dampening solution switching system (5) is controlled to close the first dampening solution supply system (1), stop guiding the ordinary dampening solution, open the second dampening solution supply system (2), and guide the quick-drying dampening solution into the dampening solution tank (31); When the operating state of the printing machine is switched from the second preset speed to the first preset speed or the stop state, the dampening solution switching system (5) is controlled to close the second dampening solution supply system (2), stop guiding the quick-drying dampening solution, open the first dampening solution supply system (1), and guide the ordinary dampening solution into the dampening solution tank (31).

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