CN109624480B

CN109624480B - Dampening water applying method based on combination of ultrasonic atomization and magnetization, system and application thereof

Info

Publication number: CN109624480B
Application number: CN201910093708.9A
Authority: CN
Inventors: 田森林; 李英杰; 黄建洪; 赵群; 胡学伟; 宁平; 宋玉新; 蒋仕飞
Original assignee: Kunming University of Science and Technology
Current assignee: Kunming University of Science and Technology
Priority date: 2019-01-30
Filing date: 2019-01-30
Publication date: 2020-02-11
Anticipated expiration: 2039-01-30
Also published as: CN109624480A

Abstract

The invention discloses a dampening water applying method based on ultrasonic atomization and magnetization combination, and a system and application thereof, wherein the method comprises the following steps: 1) magnetizing the dampening water, arranging an ultrasonic atomization device below the water roller, and adding the magnetized dampening water into the ultrasonic atomization device; 2) starting an ultrasonic atomization device, and ultrasonically atomizing magnetized fountain water onto a water roller under the ultrasonic wave of 0.1-100MHz to form a water film on the water roller; 3) and starting the water roller to transfer the dampening water from the water roller to the printing plate in a continuous and uniform water film mode. The invention creatively adopts the principle of combining ultrasonic atomization and magnetization to apply the dampening water, can greatly reduce the surface tension of the dampening water, and stably and uniformly adheres to the surface of the water roller to form a water film.

Description

Dampening water applying method based on combination of ultrasonic atomization and magnetization, system and application thereof

Technical Field

The invention belongs to the technical field of printing, and particularly relates to a dampening water applying method based on ultrasonic atomization and magnetization combination, and a system and application thereof.

Background

The offset printing is that when printing, the image-text part and the non-image-text part on the printing plate are almost on the same plane, in order to enable the ink to distinguish the image-text part and the non-image-text part of the printing plate, firstly, a dampening water applying system of a printing system supplies water to the non-image-text part of the printing plate, then, an ink supplying device of the printing system supplies ink to the printing plate, as the non-image-text part of the printing plate is protected by the water, the ink can only be supplied to the image-text part of the printing plate, finally, the ink on the printing plate is transferred to a rubber blanket, and then the ink on the rubber blanket is transferred to a printing stock by utilizing the pressure between. The water supply device of the printing system utilizes the principle that oil and water are not mutually soluble, and a thin dampening film is coated on the non-image-text part of the printing plate, thereby realizing the smooth printing of the printing ink on the printing plate.

Dampening water is a general name of dampening liquid which mainly comprises water and is added with certain additives in the prior art. Smooth formation of a dampening water film plays an important role in lithography, and in order to facilitate smooth formation of a dampening water film, it is necessary to reduce the surface tension of water. Therefore, in the prior art of lithographic printing, it is necessary to add alcohol, isopropyl alcohol (IPA), or other alcohol or ether substitutes to the fountain solution in order to reduce the surface tension of water. However, alcohol, isopropanol or other alcohol and ether substitutes have more disadvantages: 1. isopropanol contains harmful substances, which are volatile substances and cause serious environmental pollution, and in a relatively closed printing workshop, the volatile isopropanol vapor seriously damages the health of operators; 2. alcohol and isopropanol belong to flammable and explosive products, and are very unsafe because the flash point is too low and the alcohol and the isopropanol are easy to combust and explode; 3. the printing cost is increased; 4. more printing problems, severe emulsification, poor printing effect, etc. may be caused. Therefore, it is difficult to add chemical substances such as alcohols and surfactants to reduce the surface tension of the fountain solution for a long time under the trends of green and safe production and environmental protection.

In the prior art, there is a report of a zero-alcohol lithographic printing system, in which a pure physical method is adopted, a ceramic layer engraved with a reticulate pattern is arranged on a dampening roller, a sand-blasting layer on the original dampening roller is cancelled, and dampening water which has large surface tension and is difficult to form a film is physically divided into fine water drops on the reticulate pattern, so that the dampening water is thinned and formed into a film, no alcohol or ether is added, and a printed product with good quality is obtained. The method relieves the excessive use of the alcohol fountain solution and the huge pressure on the environment of the existing lithographic printing which has the dominating status in the printing field to a certain extent, but because the method depends heavily on the reticulate structure of the dampening roller, and because the printing system is in mechanical operation, the dampening roller does not need to continuously move transversely and longitudinally, the whipping distance is 5-50mm, and meanwhile, the dampening roller also needs to be in contact with a water bucket roller and a printing roller, even for the purposes of controlling the printing speed, the water supply amount and the like, certain pressure needs to be applied, so that the problems of abrasion, deformation and the like of the reticulate structure on the surface of the dampening roller are difficult to avoid; if the printing quality is not acceptable, the printing quality and the printing date are decreased until the printed product is unqualified.

Ultrasonic atomization refers to a process in which liquid is dispersed in a gas phase to form fine droplets under the action of ultrasound. In the prior art, ultrasound and ultrasonic atomization are widely applied to the fields of medicine, air purification and the like. Magnetized water has been studied and used in many fields, and it has been found that the properties of water change after magnetization, and the surface tension decreases to various degrees. In the prior art, the property of the magnetized water is widely applied to the fields of cement concrete formation, dust fall purification and the like. However, the combined use of ultrasonic atomization and magnetization for dampening water application and lithographic printing has not been reported.

In view of the above problems, it is necessary to invent a fountain water application method based on the combination of ultrasonic atomization and magnetization, and a system and an application thereof.

Disclosure of Invention

The first purpose of the invention is to provide a dampening water application method based on the combination of ultrasonic atomization and magnetization, the second purpose is to provide a dampening water application system based on the combination of ultrasonic atomization and magnetization, and the third purpose is to provide the application of the dampening water application method based on the combination of ultrasonic atomization and magnetization.

The first object of the present invention is achieved by comprising the steps of:

1) magnetizing the dampening water, arranging an ultrasonic atomization device below the water roller, and adding the magnetized dampening water into the ultrasonic atomization device;

2) starting an ultrasonic atomization device, and ultrasonically atomizing magnetized fountain water onto a water roller under the ultrasonic wave of 0.1-100MHz to form a water film on the water roller;

3) and starting the water roller to transfer the dampening water from the water roller to the printing plate in a continuous and uniform water film mode.

The second purpose of the invention is realized by the following steps that the ultrasonic atomizer is connected with the fountain water bin, the closed chain guide rail is rectangular, the upper part of the closed chain guide rail is an inwards concave arc-shaped spraying section, the closed chain guide rails are respectively arranged at two ends of a water roller, a moving chain is arranged in the closed chain guide rail, the chain driving mechanism is connected with the moving chain and is used for driving the moving chain to move in the closed chain guide rail, two ends of the moving rod are respectively connected with the moving chain of the closed chain guide rail, the moving rod is parallel to the water roller, a closed spraying working belt is formed among a plurality of moving rods, the ultrasonic atomizer is connected with the fountain water bin, forming an ultrasonic atomization device, wherein the ultrasonic atomization device is arranged on the movable rod, the ultrasonic atomizer is positioned outside the spray working zone, and the fountain is positioned inside the spray working zone;

the fountain water feeding device comprises a fountain water storage tank, a water feeding pipe and a water feeding head, wherein the water feeding pipe is provided with an electromagnetic valve, one end of the water feeding pipe is connected with the fountain water storage tank, the other end of the water feeding pipe is connected with the water feeding head, the bottom of the water feeding head is provided with two parallel sliding tables, a water gap is formed between the two sliding tables, the bottom of the fountain is provided with a water feeding port, a movable pressing table is arranged in the water feeding port, the upper part of the movable pressing table is provided with an inclined plane for sliding and pressing down, the bottom of the movable pressing table is provided with a limiting sealing cover, the limiting sealing cover is positioned in the fountain, the diameter of the limiting sealing cover is larger than that of the water feeding port, a reset spring is arranged in the fountain, one end of the reset spring is connected with the bottom of the limiting sealing cover, and the other end of the reset spring is connected with;

the water receiving tank is arranged in the spraying work zone and is positioned below the spraying section, one end of the water guide pipe is connected with a water outlet at the bottom of the water receiving tank, the other end of the water guide pipe is connected with the fountain water storage tank, the delivery pump is arranged on the water guide pipe, the first magnetized water generating device is sleeved on a water supply pipe body connected with the fountain water storage tank and the water supply device, and the second magnetized water generating device is sleeved on the water guide pipe body.

The third object of the invention is achieved by the use of the method in lithography, comprising in particular the following steps:

1) the dampening water is transferred to the printing plate in a continuous and uniform water film form by the dampening water applying method to form a patterned dampening water film;

2) applying ink to areas of the printing plate not covered by the patterned dampening water film by an ink application system;

3) and transferring the pattern on the printing plate to a rubber blanket, and further transferring the pattern to printing paper to finish printing.

Compared with the prior art, the invention has the following technical effects:

1. the invention creatively adopts the principle of combining ultrasonic atomization and magnetization to apply the dampening water, can greatly reduce the surface tension of the dampening water, and stably and uniformly adheres to the surface of the water roller to form a water film.

2. The invention applies the dampening water in an ultrasonic atomization mode, the dampening roller does not need to directly contact the dampening water, and the dampening water is magnetized before use, so that the surface tension of the dampening water is effectively reduced, the dampening water uniformly covers the dampening roller, and the surface tension of the dampening water is effectively reduced. The invention effectively reduces the consumption of the dampening water, the consumption of the dampening water is only about 50 percent of that of the prior art under the same printing quantity, and the application mode of ultrasonic atomization effectively avoids the problems that the hanging rollers of impurities, microorganisms and the like in the dampening water influence the printing quality and shorten the service life of the water roller, and can degrade organic matters and the like in the dampening water, reduce the content of the organic matters, eliminate pollution and realize clean printing. The invention can also flexibly adjust the thickness of the water film and the size of the contact angle by controlling parameters such as atomization strength, magnetic strength, magnetization time and the like, has simple operation and is not limited by the mechanical structure of the water roller.

3. The invention uses dampening water, can realize the application on a lithography system by adopting a pure physical method, and can realize the normal operation of the conventional water roller because the invention has no serious dependence on the physical parameters of the water roller, thereby saving the cost. The invention overcomes the problem that the prior art completely depends on the mechanical structure of a flat printing system, and can realize the requirement of printing on a dampening water film only by using a mode of forming the water film on the plate roller and then directly connecting the plate, thereby greatly reducing the requirement of the prior art on all levels of water rollers of a printing water supply system; furthermore, the invention can also adopt a mode of forming water films on the traditional water bucket roller or the water conveying roller and then transferring the water films to the printing plate after passing through each stage of water roller, thereby promoting the water films to be more uniform.

4. The invention can realize the purpose of printing for the conventional dampening water added with surface active substances, further can reduce the dosage of the surface active substances, and can realize high-quality printing even for the dampening water without the surface active substances.

5. The dampening water is magnetized by the first magnetized water generating device and then is sent into the dampening water storage tank for storage, so that magnetized dampening water is provided for the ultrasonic atomization nozzle; the magnetized fountain water atomized by the ultrasonic atomizing nozzle can greatly reduce the surface tension of the fountain water, stably and uniformly adhere to the surface of the water roller to form a water film, and does not need alcohol components; the spraying section of the closed chain guide rail and the moving rod form a sunken structure for accommodating the lower part of the water roller, the ultrasonic atomization device and the sprayed area of the corresponding water roller form a relatively static working state in the moving process by controlling the speed of the moving chain, so that the ultrasonic atomization spray head can continuously spray to the corresponding area, the effect of flexibly controlling the water hanging amount and the thickness of a water film is realized, and the problems that the water hanging amount is not easy to be consumed by hanging water and the water roller is easy to wear because the rotating speed of the water roller is increased in the traditional water bucket type water hanging mode are solved;

6. the dampening water adding device can automatically add dampening water to the dampening water bin in real time in the working process of the system, does not need manual operation, and has the advantages of convenience in operation and management; the proximity sensor is matched with the control device, so that the ultrasonic atomization device starts spraying when entering a spraying section and stops spraying when moving to other positions, and dampening water is automatically applied to the water roller;

7. the water receiving tank not only has the function of gathering the diffused dampening water mist into dampening water, saves the dampening water and reduces the cost, but also carries out secondary magnetization on the dampening water through the second magnetized water generating device in the process of sending the dampening water back to the dampening water storage tank, thereby ensuring the magnetization effect of the recycled dampening water.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a left side view of the structure of FIG. 1;

FIG. 3 is a schematic bottom view of the water adding head;

FIG. 4 is a schematic view of the internal structure of a dampening water tank;

FIG. 5 is a schematic view of the structure of the movable platen of FIG. 4 in a state of being pressed downward for adding water

In the figure: 1-closed chain guide rail, 2-chain driving mechanism, 3-movable rod, 4-ultrasonic atomizer, 5-fountain, 5 a-water feeding port, 5 b-movable pressing table, 5 c-limit sealing cover, 5 d-reset spring, 5 e-spring rod, 6 a-fountain water storage tank, 6 b-water feeding pipe, 6 c-water feeding head, 6 d-sliding table, 6 e-water feeding port, 6 f-water feeding pipe, 7-water receiving tank, 8-water guiding pipe, 9-delivery pump, 10-first magnetized water generating device, 11-second magnetized water generating device, 12-water roller, 13-proximity sensor, 14-conductive device and 15-sliding contact line.

Detailed Description

The invention is further described with reference to the accompanying drawings, but the invention is not limited in any way, and any alterations or substitutions based on the teaching of the invention are within the scope of the invention.

The invention relates to a fountain water application method based on ultrasonic atomization and magnetization combination, which comprises the following steps:

Preferably, the dampening water is any one of tap water, deionized water and distilled water.

Preferably, the magnetization in the step (1) is to magnetize the fountain water for 0.1-10 min under the magnetic field intensity of 10-1000 mT.

Preferably, the magnetization in the step (1) is cyclic gradient magnetization, and specifically, the fountain water is magnetized for 5-10 min under the magnetic field strength of 10-50 mT, then magnetized for 2-4 min under the magnetic field strength of 61-100 mT, then magnetized for 2-4 min under the magnetic field strength of 101-500 mT, and finally magnetized for 0.1-1 min under the magnetic field strength of 501-1000 mT.

Preferably, a magnetic field is additionally arranged between the water roller and the ultrasonic atomization device, and the intensity of the additionally arranged magnetic field is 500-800 mT.

Preferably, the ultrasonic atomization device is arranged at a position of 0.1 cm-3 cm below the water roller.

As shown in the attached figures 1-5, the invention comprises a closed chain guide rail 1, a chain driving mechanism 2, a movable rod 3, an ultrasonic atomizer 4, a dampening water bin 5, a dampening water adding device, a water receiving tank 7, a water guide pipe 8, a delivery pump 9, a first magnetized water generating device 10 and a second magnetized water generating device 11, wherein the closed chain guide rail 1 is rectangular, the upper part of the closed chain guide rail 1 is an inwards concave arc-shaped spraying section, the closed chain guide rails 1 are respectively arranged at two ends of a water roller 12, a movable chain is arranged in the closed chain guide rail 1, the chain driving mechanism 2 is connected with the movable chain and used for driving the movable chain to move in the closed chain guide rail 1, two ends of the movable rod 3 are respectively connected with the movable chain of the closed chain guide rail 1, the movable rod 3 is parallel to the water roller 12, a closed spraying working belt is formed among the movable rods 3, the ultrasonic atomizer 4 is connected with the dampening water bin 5 to form an ultrasonic atomization device, the ultrasonic atomization device is arranged on the moving rod 3, the ultrasonic atomizer 4 is positioned outside the spraying working band, and the dampening water bin 5 is positioned inside the spraying working band;

the spraying work in-band be equipped with the fountain water device of adding water, the fountain water device of adding water includes fountain water storage tank 6a, filler pipe 6b, adds water head 6c, filler pipe 6b be equipped with the solenoid valve, filler pipe 6b one end is connected with fountain water storage tank 6a, the other end with add water head 6c and be connected, add water head 6c bottom and be equipped with two parallel slip tables 6d, be equipped with mouth of a river 6e between the slip table 6d, the bottom of fountain 5 be equipped with filler mouth 5a, filler mouth 5a in be equipped with movable pressure platform 5b, the upper portion of movable pressure platform 5b is equipped with the inclined plane that is used for the slip to push down, movable pressure platform 5b bottom be equipped with spacing sealed lid 5c, spacing sealed lid 5c is located fountain 5, the diameter of spacing sealed lid 5c is greater than the diameter of filler mouth 5a, fountain 5 in be equipped with reset spring 5d, one end of a return spring 5d is connected with the bottom of the limit sealing cover 5c, and the other end is connected with the inner wall of the dampening water bin 5 opposite to the limit sealing cover 5 c;

the water receiving tank 7 is arranged in the spraying work zone and is positioned below the spraying section, one end of the water guide pipe 8 is connected with a water outlet at the bottom of the water receiving tank 7, the other end of the water receiving tank is connected with a fountain water storage tank 6a, the delivery pump 9 is arranged on the water guide pipe 8, the first magnetized water generating device 10 is sleeved on a water supply pipe 6f pipe body of the fountain water storage tank 6a connected with a water supply device, and the second magnetized water generating device 11 is sleeved on the water guide pipe 8 pipe body.

Preferably, the fountain further comprises a spring rod 5e, one end of the spring rod 5e is connected with the bottom of the limiting sealing cover 5c, the other end of the spring rod 5e is connected with the inner wall of the dampening water bin 5 opposite to the limiting sealing cover 5c, and the spring rod 5e is located around the reset spring 5d respectively.

Preferably, the upper parts of the two sides of the chain guide 1 are respectively provided with a proximity sensor 13, and the proximity sensors 13 correspond to the ultrasonic atomization devices passing through the upper part of the spray section of the closed chain guide 1.

Preferably, the ultrasonic atomizer 4 is an ultrasonic atomizer 4 with a solenoid valve.

Preferably, the side of closed chain guide 1 be equipped with electrically conductive ware 14, the carriage release lever 3 be tubular structure, the tip of carriage release lever 3 be connected with electrically conductive ware 14 through wiping line 15, the carriage release lever 3 in be equipped with the cable that is used for connecting ultrasonic nebulizer 4, the cable is connected with wiping line 15 electricity, electrically conductive ware 14 be connected with power supply unit electricity, the power consumption of ultrasonic atomization in the removal process is realized to the mode of wiping power supply.

Preferably, the water roller 12 is a water transfer roller or a plate roller.

Preferably, the ultrasonic water-feeding device further comprises a control device and a control panel, wherein the control device is electrically connected with the chain driving mechanism 2, the ultrasonic atomizer 4, the delivery pump 9, the first magnetized water generating device 10, the second magnetized water generating device 11, the electromagnetic valve of the water feeding pipe 6b, the proximity sensor 13 and the power supply device respectively.

Preferably, the control device is a PLC controller or a single chip microcomputer.

Preferably, the control panel is provided with switches for controlling the chain drive mechanism 2 and the power supply device, respectively.

The application of the dampening water application method based on the combination of ultrasonic atomization and magnetization is the application of the method in lithography, and specifically comprises the following steps:

The working principle and the working process of the invention are as follows: the dampening water conveyed in the water supply pipe 6f is magnetized by the first magnetized water generating device 10 and is sent to the dampening water storage tank 6a for storage; in the rotation process of the water roller 12, the closed chain guide rail 1 synchronously runs, and the ultrasonic atomization device moves along the closed chain guide rail 1 under the drive of the moving chain; when the ultrasonic atomization device passes through one of the proximity sensors 13, the ultrasonic atomization device passes through the spraying section of the closed chain guide rail 1, the control device controls the ultrasonic atomizer 4 of the ultrasonic atomization device to spray magnetized dampening water mist to the surface of the water roller 12, and the dampening water mist is attached to the surface of the water roller 12 to form a water film; when the ultrasonic atomizer 4 continuously sprays, the ultrasonic atomizer 4 and the corresponding water roller 12 area are relatively static in the same-speed moving process, so that the ultrasonic atomizer 4 continuously sprays the water roller 12 area to form a water film with uniform and certain thickness; when the ultrasonic atomizer 4 moves close to the other proximity sensor 13 and is detected by the proximity sensor 13, the control means controls the ultrasonic atomizer 4 to stop spraying; a spraying working band formed by a plurality of moving rods 3 passing through the spraying section covers the surface of the water roller 12;

a part of the sprayed ultrasonic water mist is dispersed and attached to the water receiving tank 7 to be gathered into dampening water, the dampening water is conveyed through the water guide pipe 8, the second magnetized water generating device 11 magnetizes the dampening water again in the conveying process, and then the dampening water is conveyed into the dampening water storage tank 6a to be stored;

in the moving process of the ultrasonic atomization device after the spraying section, after the ultrasonic atomization device is guided by the corner of the closed chain guide rail 1, the ultrasonic atomizer 4 faces downwards, and the dampening water bin 5 faces upwards; the dampening water bin 5 moves to a water adding head 6c of a dampening water adding device, the sliding table 6d presses down the inclined surface of the movable pressing table 5b in the moving process to open the water adding port 5a, meanwhile, the control device controls the opening of an electromagnetic valve of the water adding pipe 6b, and magnetized dampening water in the dampening water storage tank 6a is filled into the dampening water bin 5 through the water adding pipe 6b, the water adding head 6c and the water adding port 5 a; after the ultrasonic atomization device moves through the water adding head 6c, under the action of the reset spring 5d, the movable pressing table 5b resets, and the limit sealing cover 5c seals the water adding port 5a, so that water adding of the dampening water bin 5 is completed; by analogy, each dampening water bin 5 passing through the water adding head 6c completes water adding; the spring rod 5e plays a role of supporting the movable pressing platform 5b, and prevents the movable pressing platform 5b from being inclined in the pressing process.

Example 1

A dampening water application method based on ultrasonic atomization and magnetization combination comprises the following steps:

1) magnetizing the dampening water, arranging an ultrasonic atomization device below the water roller, and adding the magnetized dampening water into the ultrasonic atomization device; the dampening water is tap water; the magnetization is realized by magnetizing the dampening water for 10min under the magnetic field intensity of 10 mT.

2) Starting an ultrasonic atomization device, and ultrasonically atomizing the magnetized fountain water onto a water roller under the ultrasonic wave of 0.1MHz to form a water film on the water roller;

The application of the dampening water application method based on the combination of ultrasonic atomization and magnetization is the application of the method in the lithography, and specifically comprises the following steps:

The content of alcohols and substitutes thereof in the dampening water used in the embodiment is 0, the printed matter is bright, clear in middle and dark, clear in level, clear in mesh points, accurate in angle, real, natural and harmonious in color, clean in layout and free of floating dirt. After the system of the embodiment is continuously operated for 6 months, the maintenance condition is not stopped, and the obtained printed matter can keep consistent quality.

Example 2

1) magnetizing the dampening water, arranging an ultrasonic atomization device below the water roller, and adding the magnetized dampening water into the ultrasonic atomization device; the dampening water is deionized water; the magnetization is to magnetize the dampening water for 0.1min under the magnetic field intensity of 1000 mT.

2) Starting an ultrasonic atomization device, and ultrasonically atomizing magnetized fountain water onto a water roller under 100MHz ultrasonic waves to form a water film on the water roller;

The content of alcohols and substitutes thereof in the dampening water used in the embodiment is 0, the printed matter is bright, clear in middle and dark, clear in level, clear in mesh points, accurate in angle, real, natural and harmonious in color, clean in layout and free of floating dirt. After the system of the embodiment is continuously operated for 12 months, the maintenance condition is not stopped, and the obtained printed matter can keep consistent quality.

Example 3

1) magnetizing the dampening water, arranging an ultrasonic atomization device below the water roller, and adding the magnetized dampening water into the ultrasonic atomization device; the dampening water is distilled water; the magnetization is to magnetize the dampening water for 1min under the magnetic field intensity of 100 mT.

2) Starting an ultrasonic atomization device, and ultrasonically atomizing magnetized fountain water onto a water roller under the ultrasonic of 1MHz to form a water film on the water roller;

The content of alcohols and substitutes thereof in the dampening water used in the embodiment is 0, the printed matter is bright, clear in middle and dark, clear in level, clear in mesh points, accurate in angle, real, natural and harmonious in color, clean in layout and free of floating dirt. After the system of the embodiment is continuously operated for 24 months, the maintenance condition is not stopped, and the obtained printed matter can keep consistent quality.

Example 4

1) magnetizing the dampening water, arranging an ultrasonic atomization device below the water roller, and adding the magnetized dampening water into the ultrasonic atomization device; the dampening water is added with 30% of the original surface active substance; the magnetization is cyclic gradient magnetization, and specifically, the fountain water is magnetized for 10min under the magnetic field strength of 10mT, then magnetized for 4min under the magnetic field strength of 61mT, magnetized for 4min under the magnetic field strength of 101mT, and finally magnetized for 1min under the magnetic field strength of 501 mT. The ultrasonic atomization device is arranged at a position 0.1cm below the water roller.

2) Starting an ultrasonic atomization device, and ultrasonically atomizing the magnetized fountain water onto a water roller under 2MHz ultrasonic waves to form a water film on the water roller; a magnetic field is additionally arranged between the water roller and the ultrasonic atomization device, and the intensity of the additionally arranged magnetic field is 500 mT.

The printed matter of the embodiment has the advantages of bright, medium and dark tones, clear layers, clear dots, accurate angles, real, natural and harmonious colors, clean layout and no floating dirt phenomenon. After the system of the embodiment is continuously operated for 36 months, the maintenance condition is not stopped, and the obtained printed matter can keep consistent quality.

Example 5

1) magnetizing the dampening water, arranging an ultrasonic atomization device below the water roller, and adding the magnetized dampening water into the ultrasonic atomization device; the dampening water is added with surface active substances with the original addition amount of 15%; the magnetization is cyclic gradient magnetization, and specifically, the fountain water is magnetized for 5min under the magnetic field strength of 50mT, then magnetized for 2min under the magnetic field strength of 100mT, magnetized for 2min under the magnetic field strength of 500mT, and finally magnetized for 0.1min under the magnetic field strength of 1000 mT. The ultrasonic atomization device is arranged at the position 3cm below the water roller.

2) Starting an ultrasonic atomization device, and ultrasonically atomizing magnetized fountain water onto a water roller under 10MHz ultrasonic waves to form a water film on the water roller; a magnetic field is additionally arranged between the water roller and the ultrasonic atomization device, and the intensity of the additionally arranged magnetic field is 800 mT.

The printed matter of the embodiment has the advantages of bright, medium and dark tones, clear layers, clear dots, accurate angles, real, natural and harmonious colors, clean layout and no floating dirt phenomenon. After the system of the embodiment is continuously operated for 18 months, the maintenance condition is not stopped, and the obtained printed matter can keep consistent quality.

Example 6

1) magnetizing the dampening water, arranging an ultrasonic atomization device below the water roller, and adding the magnetized dampening water into the ultrasonic atomization device; the dampening water is tap water; the magnetization is cyclic gradient magnetization, specifically, the dampening water is magnetized for 8min under the magnetic field strength of 30mT, then magnetized for 3min under the magnetic field strength of 80mT, magnetized for 3min under the magnetic field strength of 200mT, and finally magnetized for 0.5min under the magnetic field strength of 800 mT. The ultrasonic atomization device is arranged at a position 1cm below the water roller.

2) Starting an ultrasonic atomization device, and ultrasonically atomizing magnetized fountain water onto a water roller under 5MHz ultrasonic waves to form a water film on the water roller; a magnetic field is additionally arranged between the water roller and the ultrasonic atomization device, and the intensity of the additionally arranged magnetic field is 600 mT.

The content of alcohols and substitutes thereof in the dampening water used in the embodiment is 0, the printed matter is bright, clear in middle and dark, clear in level, clear in mesh points, accurate in angle, real, natural and harmonious in color, clean in layout and free of floating dirt. After the system of the embodiment is continuously operated for 15 months, the maintenance condition is not stopped, and the obtained printed matter can keep consistent quality.

Claims

1. A dampening water application method based on ultrasonic atomization and magnetization combination is characterized by comprising the following steps: 1) Magnetizing the dampening water, arranging an ultrasonic atomization device below the water roller, and adding the magnetized dampening water into the ultrasonic atomization device;

3) starting the water roller to transfer dampening water from the water roller to the printing plate in a continuous and uniform water film mode;

the dampening water applying system based on ultrasonic atomization and magnetization combination comprises a closed chain guide rail (1), a chain driving mechanism (2), a moving rod (3), an ultrasonic atomizer (4), a dampening water bin (5), a dampening water adding device, a water receiving tank (7), a water guide pipe (8), a conveying pump (9), a first magnetized water generating device (10) and a second magnetized water generating device (11), wherein the closed chain guide rail (1) is rectangular, the upper part of the closed chain guide rail (1) is an inwards concave arc-shaped spraying section, the closed chain guide rail (1) is respectively arranged at two ends of a water roller (12), a moving chain is arranged in the closed chain guide rail (1), the chain driving mechanism (2) is connected with the moving chain and used for driving the moving chain to move in the closed chain guide rail (1), the two ends of the moving rod (3) are respectively connected with a moving chain of the closed chain guide rail (1), the moving rod (3) is parallel to the water roller (12), a closed spraying working belt is formed among the moving rods (3), the ultrasonic atomizer (4) is connected with the dampening water bin (5) to form an ultrasonic atomization device, the ultrasonic atomization device is arranged on the moving rod (3), the ultrasonic atomizer (4) is positioned outside the spraying working belt, and the dampening water bin (5) is positioned inside the spraying working belt; the fountain solution watering device is characterized in that the fountain solution watering device is arranged in the spraying work belt and comprises a fountain solution storage tank (6 a), a watering pipe (6 b) and a watering head (6 c), the watering pipe (6 b) is provided with an electromagnetic valve, one end of the watering pipe (6 b) is connected with the fountain solution storage tank (6 a), the other end of the watering pipe is connected with the watering head (6 c), the bottom of the watering head (6 c) is provided with two parallel sliding tables (6 d), a water gap (6 e) is arranged between the sliding tables (6 d), the bottom of the fountain (5) is provided with a water gap (5 a), the water gap (5 a) is internally provided with a movable pressing table (5 b), the upper part of the movable pressing table (5 b) is provided with an inclined plane for sliding and pressing down, the bottom of the movable pressing table (5 b) is provided with a limiting sealing cover (5 c), and the limiting sealing cover (5 c) is positioned in the fountain (5), the diameter of the limiting sealing cover (5 c) is larger than that of the water filling port (5 a), a return spring (5 d) is arranged in the dampening water sump (5), one end of the return spring (5 d) is connected with the bottom of the limiting sealing cover (5 c), and the other end of the return spring is connected with the inner wall of the dampening water sump (5) opposite to the limiting sealing cover (5 c); water receiving tank (7) locate the spraying work in-band, and be located spraying section below, one end and water receiving tank (7) bottom outlet connection of aqueduct (8), the other end is connected with fountain water storage tank (6 a), delivery pump (9) locate on aqueduct (8), first magnetized drinking water generating device (10) cover locate on the feed pipe (6 f) body that fountain water storage tank (6 a) and water supply installation are connected, second magnetized drinking water generating device (11) cover locate on aqueduct (8) body.

2. The method of claim 1, wherein the dampening water is any one of tap water, deionized water, distilled water, and existing dampening water with any amount of surface active substances added.

3. The method of claim 1, wherein the magnetization in step (1) is magnetization of the fountain water at a magnetic field strength of 10 to 1000mT for 0.1 to 10 min.

4. The method for applying dampening water based on the combination of ultrasonic atomization and magnetization according to claim 1, characterized in that the magnetization in step (1) is cyclic gradient magnetization, and specifically, the dampening water is magnetized for 5-10 min under a magnetic field strength of 10-50 mT, then magnetized for 2-4 min under a magnetic field strength of 61-100 mT, then magnetized for 2-4 min under a magnetic field strength of 101-500 mT, and finally magnetized for 0.1-1 min under a magnetic field strength of 501-1000 mT.

5. The method for applying dampening water based on the combination of ultrasonic atomization and magnetization as claimed in claim 1, characterized in that a magnetic field is applied between the water roller and the ultrasonic atomization device, and the intensity of the applied magnetic field is 500-800 mT.

6. The dampening water application method based on the combination of ultrasonic atomization and magnetization as claimed in claim 1, characterized in that the application system further comprises a spring rod (5 e), one end of the spring rod (5 e) is connected with the bottom of the limit sealing cover (5 c), the other end is connected with the inner wall of the dampening water tank (5) opposite to the limit sealing cover (5 c), and the spring rod (5 e) is respectively located around the return spring (5 d).

7. The method for applying dampening water based on the combination of ultrasonic atomization and magnetization as claimed in claim 1, characterized in that the closed chain guide (1) is provided with a conductive device (14) on the side, the moving rod (3) is of a tubular structure, the end of the moving rod (3) is connected with the conductive device (14) through a trolley wire (15), the moving rod (3) is provided with a cable for connecting the ultrasonic atomizer (4), the cable is electrically connected with the trolley wire (15), and the conductive device (14) is electrically connected with a power supply device.

8. The dampening water application method based on the combination of ultrasonic atomization and magnetization according to claim 1, characterized in that the application system further comprises a control device and a control panel, wherein the control device is electrically connected with the chain driving mechanism (2), the ultrasonic atomizer (4), the delivery pump (9), the first magnetized water generating device (10), the second magnetized water generating device (11), the electromagnetic valve of the water feeding pipe (6 b), the proximity sensor (13) and the power supply device respectively.

9. Use of a method according to any of claims 1 to 5 for applying dampening water based on a combination of ultrasonic atomization and magnetization, characterized in that the method is used in lithography, in particular comprising the following steps: