Printing equipment for printing solvent-free ink on polymer resin film

Abstract

The utility model discloses printing equipment for printing solvent-free ink on a polymer resin film, which comprises a central roller and a plurality of printing color cells distributed around the circumference of the central roller, and the central roller and the plurality of printing color cells form a satellite type flexographic printing mechanism; each printing color group comprises an anilox roller, a printing plate roller, a closed scraper component and an LED photocuring component; the printing equipment further comprises a center roller temperature controller used for controlling the surface temperature of the center roller, an LED lamp cooling-water machine used for cooling the LED light curing component, a dehumidifier used for controlling the humidity of the printing environment and an LED electric cabinet used for providing energy for the LED-UV light curing component. The printing equipment is low in overprinting precision, low in platemaking cost, low in ink consumption and high in efficiency, and when the high-line-number anilox roller and the high-line-number printing plate roller are applied at the same time, printed matter is not prone to being burnt, the effect is clear, and the ink color is bright.

Description

Technical Field

[0001] The utility model relates to a printing device for printing solvent-free ink on a polymer resin film, and more specifically, to a satellite flexographic printing device consisting of a central roller and a plurality of printing color groups. Background Art

[0002] Printing is a technology that transfers the ink of text, pictures, photos, anti-counterfeiting manuscripts to the surface of paper, textiles, plastics, leather, PVC, PC and other materials through processes such as plate making, inking and pressurization, so as to batch reproduce the contents of the original manuscripts.

[0003] Although the development of paperless technology has reduced the need for paper printing to a certain extent, the development of today's industry has made printing on other printing materials, such as polymer resin films, increasingly important, because the information carried by printing is one of the primary factors for consumers to judge product quality.

[0004] Ink is an important substance in the printing industry. It directly determines the tone, color, clarity, etc. of the image on the printed product. It generally contains pigments, resins, additives, etc. According to the printing method, printing ink can be roughly divided into lithographic printing ink, letterpress printing ink, gravure printing ink, stencil printing ink, special printing ink, etc.

[0005] Traditional solvent-based printing inks require the use of organic solvents, which will volatilize a large amount of organic compounds (VOCs) during the drying process. Contact with them will cause dry skin, penetrate into the skin and blood, and endanger human blood cells and hematopoietic function. Inhalation of the human body will cause certain damage to the liver and kidneys. Workers working in such an environment will cause damage to the nervous system. Therefore, the VOC content of products printed with solvent-based inks must be tested. Although water-based inks do not use organic solvents, they have the disadvantages of poor printing quality, easy ink shedding, and difficulty in printing on polymer printing substrates.

[0006] Compared with traditional inks, LED-UV The ink cures quickly and has the advantages of high efficiency, low cost and environmental protection. LED-UV Ink is increasingly used in printing. UV ink contains no solvents, emits almost no pollutants, and dries quickly. According to statistics, the annual output of UV ink is about 16,000 tons in Japan, about 18,000 tons in Europe, and about 19,000 tons in North America. In my country, it is also widely used in offset printing, flexographic printing, gravure printing, screen printing, and inkjet printing.

[0007] Chinese patent application CN 202110244739.7 discloses a solvent-free printing compound machine, including: a paper unwinding device for inputting substrate A, a multi-color printing unit for printing on substrate A, a film unwinding device for inputting substrate B, a coating compounding unit for solvent-free compounding of substrate A and substrate B, and a paper rewinding device for rewinding the finished product after printing and compounding, wherein the multi-color printing unit includes a plurality of printing units connected in series, each printing unit includes a printing plate roller loaded with solvent-free ink arranged on a frame in sequence, a pressing roller for rolling the substrate to be printed on the printing plate roller so as to transfer the ink from the printing plate roller to the substrate to be printed, a first curing device for drying and curing the printed substrate, and a first cooling device for cooling the substrate during the curing process; the printing plate roller is a gravure printing plate. It can be seen that the patent application discloses a gravure printing device suitable for printing on paper, and its overprinting accuracy is not suitable for overprinting on a polymer resin film, and the gravure plate making cost is high, which is not suitable for small batch printing.

[0008] Chinese patent application 202210465275.7 discloses a photocurable solvent-free printing composite unit, which is sequentially provided with a first film unwinding unit, a printing unit, a coating composite unit, a second film unwinding unit and a film winding unit; the printing unit includes a plurality of printing devices, and a first EB electron beam generator for curing the first film material after printing is also provided on the printing device, and the first EB electron beam generator is behind the printing position in the conveying direction of the first film material, and a second EB electron beam generator for curing the solvent-free adhesive on the second film material is provided behind the composite device in the conveying direction of the first film material. In the electron beam generator, electrons escape when the cathode is heated to a certain temperature, and the electrons are accelerated in the high-voltage electric field, and after being focused by the electromagnetic lens, an electron beam with extremely high energy density is formed. The light emission mode of LED-UV lamp beads (or UVLED lamps) is field-induced luminescence. Similarly, the printing equipment disclosed in the patent application is not suitable for overprinting on polymer resin films.

[0009] Therefore, it is necessary to provide a process method for printing with solvent-free ink which has low plate-making cost, high efficiency, high overprinting accuracy and is suitable for polymer resin films. Utility Model Content

[0010] The purpose of the utility model is to provide a printing device with high overprinting accuracy and suitable for solvent-free ink flexographic printing of polymer resin films. The production process using this printing device has the characteristics of low plate making cost, low ink consumption, high efficiency, and no VOCs emissions.

[0011] In order to achieve the above-mentioned invention purpose, the utility model provides a printing device for printing solvent-free ink on polymer resin film, the printing device includes a central roller, a plurality of printing color groups distributed around the circumference of the central roller, the central roller and the plurality of printing color groups constitute a satellite flexographic printing mechanism; each printing color group includes an anilox roller, a plate roller, a closed scraper component and an LED light curing component; the printing device further includes a mold center roller temperature controller, an LED lamp chiller, a dehumidifier and an LED electric cabinet, wherein the central roller mold temperature controller is used to control the surface temperature of the central roller, the LED lamp chiller is used to cool the LED light curing component, the dehumidifier is used to control the humidity of the printing environment, and the LED electric cabinet provides energy for the LED-UV light curing component.

[0012] In the printing device of the utility model, the solvent-free ink is first transferred from the ink chamber to the anilox roller (ink transfer roller), then from the anilox roller to the printing plate roller, and finally from the printing plate roller to the polymer resin film. During printing, the polymer resin film is attached to the central roller, and the printing plate roller is pressed on the polymer resin film.

[0013] In the printing device of the present invention, the base material of the printing plate is a polymer resin material or rubber, so the printing plate roller of the present invention has a relief plate structure, and its plate making cost is much lower than that of the gravure plate made of metal material. Especially for small-batch printing, such as product packaging, the cost difference will be quite huge.

[0014] In the printing device of the utility model, each printing color group is arranged around the periphery of the central roller. Through the rotation of the central roller, each printing color group rotates synchronously and prints at the same time. This satellite printing makes the overprinting more accurate.

[0015] Preferably, in the printing device of the present invention, the number of printing color groups may be 1-6, for example 3. Each printing color group prints a single color of solvent-free ink.

[0016] In the present invention, since the solvent-free ink is transferred through the anilox roller, the ink consumption is reduced by at least 20% compared with the gravure printing method, and the speed of the flexographic printing is several times higher than that of the common gravure printing.

[0017] In the printing equipment of the utility model, in order to achieve the effects of clear printing effect, enhanced three-dimensional sense and faster printing speed, the selection of the anilox roller is also very important. There are many tiny concave holes of the same shape evenly distributed on the surface of the anilox roller, which are generally referred to as "ink holes". These ink holes play the role of ink storage, ink uniformity and quantitative ink transfer in printing. The line number of the anilox roller refers to the number of ink holes per unit length on the surface of the anilox roller, which has a very important influence on the ink transfer performance of the anilox roller. Generally speaking, the higher the line number of the anilox roller, the smaller the ink transfer amount, and vice versa. Because the color concentration of solvent-free ink is high, an anilox roller with a higher line number can be configured to make the ink transfer amount uniform, but the designer of the utility model found through experiments that if the line number is too high, the ink is easy to clog the network. After repeated experiments, the designer found that the line number of the anilox roller is more suitable when it is 800-1300LPI, which can simultaneously meet the requirements of uniform ink transfer amount and not easy to clog the network. In addition, factors such as high hardness, high density, high precision and compatibility with printing plates and inks should also be considered when selecting anilox rollers.

[0018] In the printing device of the present invention, the line number of the plate roller is preferably controlled to be above 130 LPI, for example, controlled between 130-170 LPI.

[0019] In the present utility model, it is preferred to place the entire printing equipment in a closed environment to ensure that the printing equipment is in a constant temperature and humidity state. For example, the printing equipment can be enclosed as a whole, and a constant temperature dehumidification device can be installed to ensure the temperature and humidity of the environment, thereby ensuring the normal operation of printing and curing. The enclosure method can adopt a movable enclosure to facilitate opening and closing, and convenient plate changing operations; a dehumidification device can be configured, and the humidity can be maintained at a set value of ±2%, and real-time humidity detection can be performed at the unwinding, printing, and winding positions. The reason for adopting constant temperature and humidity is that the LED will be affected by the ambient humidity and temperature during the cationic light curing process, especially the influence of ambient humidity, which will cause the cationic light curing rate to decrease. The designer uses closed measures to control the temperature and humidity of the entire printing environment for the entire printing equipment in the production line. After countless experiments, it is known that the temperature of the printing environment is controlled at about 30 degrees and the relative humidity is controlled at about 40%, which can achieve the best printing and curing effect.

[0020] In the printing device of the utility model, an unwinding station can be connected to the upstream thereof, and the unwinding station is provided with an unwinding device to supply the polymer resin film to be printed. The unwinding station preferably adopts a double station or a multi-station, so that the automatic flipping and splicing action can be continuously performed when the roll film is replaced. The advantage of such a design is that when one unwinding station is still performing the unwinding operation, the other unwinding station can perform the operation of replacing the roll film, thereby ensuring that the polymer resin film is always in the continuous feeding process during the printing process without interruption.

[0021] In the printing device of the utility model, an LED-UV lamp group light source is used for irradiation, and the wavelength of the light source is controlled at 200-500nm, which can make the solvent-free ink quickly solidify and dry on the polymer resin film, and the curing time is generally controlled within 0.02 seconds or less.

[0022] Compared with traditional UV lamps (mercury lamps), LED-UV lamp beads (or UVLED lamps) use field-induced luminescence as the light source, which has many advantages: (1) Ultra-long service life, generally more than 10 times that of traditional mercury lamp curing machines; (2) Cold light source, no thermal radiation, low heat generation, and low surface temperature rise of the irradiated object; (3) Instantaneous lighting, no need for preheating, and instant 100% power UV output; (4) High energy, stable light output, and good uniform irradiation effect; (5) Customizable effective irradiation area; (6) Contains no mercury and does not produce ozone; (7) Low consumption, with power consumption of only 10% of traditional mercury lamp curing machines.

[0023] Compared with the prior art, the printing equipment of the utility model has high overprinting accuracy and is suitable for polymer resin films, and has the characteristics of low platemaking cost, low ink consumption, high efficiency, and almost no VOCs emissions; moreover, in the printing equipment of the utility model, high-line-count anilox rollers and high-line-count plate rollers are used for printing at the same time, which can make the printed products less likely to be sticky, with clear effects and bright and vivid ink colors.

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations, but these specific implementations are only descriptions of certain specific implementations of the present invention and are not limitations of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a printing device used for printing solvent-free ink on a polymer resin film in the utility model;

[0026] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0027] 1 Center roller

[0028] 2 First printing color group

[0029] 21 LED-UV light curing lamp group of the first printing color group

[0030] 3 Second printing color group

[0031] 31 LED-UV light curing lamp group for the second printing color group

[0032] 4 Third printing color group

[0033] 41 LED-UV light curing lamp group of the third printing color group

[0034] 5 Anilox roller

[0035] 6 Printing Plate

[0036] 7 Dehumidifier

[0037] 8 LED and other chillers

[0038] 9 Center roller mold temperature controller

[0039] 10 LED electric cabinet

[0040] 11 Enclosed scraper DETAILED DESCRIPTION

[0041] Figure 1 The utility model shows a printing device used for printing solvent-free ink on a polymer resin film.

[0042] In the printing device of the present invention, a plurality of printing color groups are distributed in a satellite manner around the circumference of the central roller 1. For example, there may be three printing color groups: a first printing color group 2, a second printing color group 3 and a fourth printing color group 4. Each printing color group includes an anilox roller 5, a plate roller 6 and a closed scraper 11. Each printing color group is respectively provided with an LED-UV light curing lamp group 21 of the first printing color group 2, an LED-UV light curing lamp group 31 of the second printing color group 3 and an LED-UV light curing lamp group 41 of the third printing color group 4; each lamp group includes a plurality of LED lamp beads.

[0043] The printing equipment of the present invention further includes a central roller mold temperature controller 9, an LED lamp chiller 8, a dehumidifier 7 and an LED electric cabinet 10, wherein the central roller mold temperature controller 9 is used to control the surface temperature of the central roller 1, the LED lamp chiller 8 is used to cool each LED light-curing component 21, 31, 41, the dehumidifier 7 is used to control the humidity of the printing environment, and the LED electric cabinet 10 provides energy for each LED-UV light-curing component 21, 31, 41.

[0044] The printing device of the utility model may further include a temperature control device (not shown in the figure) to ensure constant temperature and humidity of the printing device.

[0045] The printing device of the present invention may include a plurality of printing color groups, for example, 1-6, or according to specific circumstances, the printing color groups may be 3.

[0046] The printing device of the utility model can be enclosed as a whole so as to better control temperature and humidity.

[0047] In a specific embodiment of the utility model, an unwinding station is connected to the upstream of the printing device, and the unwinding station is provided with an unwinding device to supply the polymer resin film to be printed.

[0048] In another specific embodiment of the utility model, there are two unwinding stations, wherein when one unwinding station is performing an unwinding operation, the other unwinding station can perform an operation of replacing the roll film to ensure that the polymer resin film is continuously printed during the printing process.

[0049] In another specific embodiment of the present invention, the line number of the anilox roller 5 is between 800-1300 LPI, that is, 800-1300 tiny concave holes of the same shape, namely 800-1300 inking holes, are evenly distributed in each inch of the anilox roller surface.

[0050] In yet another specific embodiment of the present invention, the line number of the printing plate roller 6 is between 130-170 LPI.

[0051] In the printing device of the present invention, the printing plate roller 6 has a relief plate structure.

[0052] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A printing device for printing solvent-free ink on a polymer resin film, characterized in that: The printing device comprises a central roller (1), and a plurality of printing color groups (2, 3, 4) distributed around the circumference of the central roller (1), wherein the central roller and the plurality of printing color groups constitute a satellite flexographic printing mechanism; each of the printing color groups (2, 3, 4) comprises an anilox roller (5), a printing plate roller (6), a closed scraper component (11) and an LED-UV light curing component (21, 31, 41); the printing device further comprises a central roller mold temperature controller (9), an LED lamp chiller (8), a dehumidifier (7) and an LED electrical cabinet (10), wherein the central roller mold temperature controller (9) is used to control the surface temperature of the central roller (1), the LED lamp chiller (8) is used to cool the LED-UV light curing component (21, 31, 41), the dehumidifier (7) is used to control the humidity of the printing environment, and the LED electrical cabinet (10) provides energy for the LED-UV light curing component (21, 31, 41).

2. The printing device according to claim 1, characterized in that The printing plate roller (6) has a relief plate structure.

3. The printing device according to claim 1, characterized in that There are three printing color groups.

4. The printing device according to claim 1, characterized in that The line number of the anilox roller (5) is between 800 and 1300 LPI.

5. The printing device according to claim 1, characterized in that The line number of the printing plate roller (6) is between 130-170LPI.

6. The printing device according to claim 1, characterized in that The printing device is entirely enclosed to better control temperature and humidity.

7. The printing device according to claim 1, characterized in that An unwinding station is connected to the upstream of the printing device, and the unwinding station is provided with an unwinding device to supply the polymer resin film to be printed.

8. The printing device according to claim 7, characterized in that There are two unwinding stations, wherein when one unwinding station is performing an unwinding operation, the other unwinding station can perform an operation of replacing the roll film, so as to ensure that the polymer resin film is always in continuous printing during the printing process.

Images