CN118342905A - Solvent-free ink printing process of high polymer resin film - Google Patents

Abstract

The invention discloses a process method for printing solvent-free ink on a high polymer resin film, which sequentially comprises the steps of film rolling and mounting, film connection, drawing and printing, curing, repeated printing and curing, drawing and winding a finished product and the like; wherein, the printing is performed; the high polymer resin film passes through a plurality of printing color groups which are arranged on the periphery of the central roller and synchronously rotate, each printing color group comprises a high-line-number anilox roller with the line number of 800-1300LPI and a printing plate with the line number of more than 130LPI, so that solvent-free ink is transferred from an ink cavity to the anilox roller, then transferred to the printing plate and finally transferred to the high polymer resin film, and each printing color group prints solvent-free ink with single color; and during curing, the solvent-free printing ink with the color is quickly cured and dried on the high polymer resin film by using an LED-UV lamp set light source for irradiation. According to the flexography method, the high-line anilox roller and the high-line printing plate are simultaneously applied to print, so that the obtained printed matter is not easy to paste, and the flexography method is clear in effect and bright in ink color.

Description

Solvent-free ink printing process of high polymer resin film

Technical Field

The invention relates to a solvent-free ink printing process, in particular to a solvent-free ink printing process of a polymer resin film.

Background

Printing is a technique of transferring ink onto surfaces of materials such as paper, textiles, plastics, leather, PVC, PC and the like by performing procedures such as plate making, ink application, pressurization and the like on originals such as characters, pictures, photos and anti-counterfeiting, and copying original contents in batches. It can be said that the printing technology greatly promotes the rapid expansion of modern society, because of the existence of printed matter books, the latter can easily stand on the shoulders of the former science huge.

The development of paperless, reduces to some extent the need for paper printing. However, the development of industry today makes printing on other printing materials such as polymeric resin films more and more important, because the information carried by the printing is one of the primary factors for consumer judgment of product quality.

Inks are important materials in the printing industry, which directly determine the tone, color, sharpness, etc. of images on printed matter, and generally contain pigments, resins, additives, etc. Printing inks are classified into lithographic printing inks, letterpress printing inks, intaglio printing inks, stencil printing inks, specialty printing inks, and the like. Wherein, most of the lithographic printing ink is oxidized conjunctiva drying printing ink; the embossing ink is thick ink, and the drying mode comprises permeation drying, oxidation film drying, volatilization drying and the like; gravure ink can be divided into gravure ink and engraving gravure ink, the former is dilute fluid, is volatile drying ink, and the latter has high viscosity and basically depends on oxidation conjunctiva drying; the porous printing ink is required to have good fluidity, low viscosity and fast passing through mesh, and the drying modes include a volatile drying type, an oxidative polymerization type, a permeation drying type, a two-component reaction type, an ultraviolet drying type and the like; the special ink can be classified into foaming ink, magnetic ink, fluorescent ink, conductive ink and the like, and has the characteristics of no volatile solvent, no odor, no net blocking, high curing speed, strong water resistance, gorgeous color and the like.

The traditional solvent printing ink needs to use an organic solvent, a large amount of organic compounds (VOC for short) can be volatilized in the drying process, skin is cracked by contact, skin and blood can be permeated, blood cells and hematopoiesis of people can be endangered along with blood, and the inhaled people can cause certain damage to liver and kidney, and the worker is in the environment to cause damage to a nervous system. Therefore, the VOC content of a product printed with a solvent-based ink needs to be checked. Although the aqueous ink does not use an organic solvent, it has poor printing quality, is easily detached, and is difficult to print on a polymer printing substrate.

Compared with the traditional ink, the LED-UV ink has the advantages of high curing speed, high efficiency, low cost, environmental protection and the like. Recently, with the rising environmental protection requirements, LED-UV inks are increasingly used in printing. The UV ink contains no solvent, has almost zero pollutant emission, and has high drying speed. The annual output of UV inks was statistically about 1.6 ten thousand tons in japan, about 1.8 ten thousand tons in europe, and about 1.9 ten thousand tons in north america. It is also widely used in offset printing, flexography, gravure, screen printing and ink-jet printing.

Chinese patent application CN 2015155267. X discloses a transfer film-free gravure holographic process method, comprising the steps of: printing a color layer on a substrate by a first printing roller; coating an ink layer on the color layer by a second printing roller; solidifying the ink layer by a first drying device until the surface is dry; imprinting the ink layer obtained in the step by a pattern imprinting roller with a holographic pattern to obtain a holographic pattern layer; and curing the holographic pattern layer by a second drying device until the holographic pattern layer is completely dried. Although gravure printing has better precision and consistency, the plate making cost is high, the ink consumption is large, and the production cost is high.

Chinese patent application CN 202110244739.7 discloses a solvent-free printing composite process, comprising the following process steps: s1: inputting the substrate A by using a paper unreeling device; s2: sequentially carrying out solvent-free gravure printing on the substrate A for a plurality of times by using a plurality of groups of printing units; s3: inputting a substrate B by using a film unreeling device, and compounding the substrate B onto the substrate A by using a coating compounding unit to form a composite material, so as to obtain a finished product; s4: winding a finished product by using a paper winding device; the steps in step S2 and step S3 are continuous. The process disclosed in this application is still directed to gravure printing.

Therefore, it is necessary to provide a process method for solvent-free ink printing which is low in plate making cost, low in ink consumption, high in efficiency, high in overprinting accuracy and suitable for polymer resin films.

Disclosure of Invention

The invention aims to provide a process method for solvent-free ink flexography, which has the characteristics of low plate making cost, low ink consumption, high efficiency, no VOCs emission and the like, and is high in overprinting precision and suitable for high polymer resin films.

In order to achieve the above object, the present invention provides a process for solvent-free ink printing of a polymer resin film, which comprises the following steps:

(1) Film rolling and mounting: loading and fixing a rolled film of the high polymer resin film to an unreeling station of printing equipment;

(2) Membrane connection: fixing the high polymer resin film in the rolled film at an unreeling station, automatically overturning and connecting the rolled film to the belt printing film;

(3) Drawing and printing: the coiled film is unreeled by traction constant tension, and the stable centering of the printed high polymer resin film is ensured;

(4) Printing: the high polymer resin film passes through a plurality of printing color groups which are arranged on the periphery of the central roller and synchronously rotate, each printing color group comprises a high-line-number anilox roller with the line number of 800-1300LPI and a printing plate with the line number of more than 130LPI, so that solvent-free ink is transferred from an ink cavity to the anilox roller, then transferred to the printing plate and finally transferred to the high polymer resin film; wherein each color set prints a single color solvent-free ink;

(5) Curing: after printing solvent-free ink of a certain single color in each color group, irradiating by using an LED-UV lamp group light source to quickly cure and dry the solvent-free ink of the color on a high polymer resin film;

(6) Repeating the step (4) and the step (5) to enable the solvent-free ink with other colors to be quickly cured and dried on the high polymer resin film until the whole pattern is printed on the high polymer resin film;

(7) And (3) drawing a finished product: after pattern printing is finished, stably dragging the high polymer film to a winding station by constant tension;

(8) And (3) rolling: and (3) flatly rolling the printed high polymer resin film according to the designated tension and taper.

In the process method of solvent-free ink printing of the present invention, solvent-free ink is transferred from an ink chamber to an anilox roller (transfer roller), then transferred from the anilox roller to a printing plate, and finally transferred from the printing plate to a polymer resin film. Wherein the polymer resin film is adhered to the center roller during printing, and the printing plate is pressed on the polymer resin film.

In the present invention, the base material of the printing plate can be polymer resin material or rubber, so that the plate making cost is much lower than that of the metal gravure plate, and the cost difference is quite large especially for small-batch printing, such as product packaging and the like.

In the invention, each printing color group is arranged around the periphery of the central roller, and the printing color groups synchronously rotate and print simultaneously through the rotation of the central roller, so that the satellite printing enables overprinting to be more accurate.

In the present invention, the solvent-free ink is transferred by the anilox roller, so that the ink consumption is reduced by at least 20% or more than that of the gravure printing mode, and the speed of the flexographic printing is several times or more than that of the common gravure printing speed.

In the process of solvent-free ink printing of the present invention, the solvent-free ink used in step (4) is a cationic photocurable composition employing a cationic reactive compound and a cationic photoinitiator, to which an anthracene ester sensitizer is added. That is, the solvent-free ink used in the present invention may contain an anthracene ester sensitizer in addition to the cationic polymerizable compound, the cationic photoinitiator, the pigment, and other auxiliaries, and the content thereof may be 0.01 to 2wt%, preferably 0.1 to 1wt% of the solvent-free ink. Such anthraquinone sensitizers are derivatives having an anthraquinone structure, such as derivatives having various short chain alkyl groups or substituted alkyl groups attached to an oxygen atom. And an anthracene ester sensitizer is added to convert the wavelength of the LED light source, so that the initiator is absorbed, and the curing is more complete.

In addition, in the invention, the selection of the anilox roller is also important in order to achieve the effects of clear printing effect, enhanced stereoscopic impression and faster printing speed. A plurality of tiny concave holes with uniform shapes are uniformly distributed on the surface of the anilox roller, which are commonly called as 'inking holes', and the inking holes play roles in ink storage, ink homogenization and quantitative ink transfer in printing. The number of lines of the anilox roller refers to the number of inking holes per unit length of the surface of the anilox roller, which has a very important influence on the inking performance of the anilox roller. In general, the higher the number of lines of the anilox roller, the smaller the ink transfer amount thereof, and vice versa. Since the solvent-free ink is high in color density, a higher number of lines of anilox roller may be arranged to make the ink transfer amount uniform, but the inventors found out that the number of lines is too high, the ink is liable to clog the screen, resulting in a change in printing color. After repeated experiments, the inventor finds that the number of lines of the anilox roller is more suitable when the number of lines of the anilox roller is 800-1300LPI, and can simultaneously meet the requirements of uniform ink transfer amount and difficult net blocking. In addition, the anilox roller should be selected by taking into account the factors such as high hardness, high density, high precision, and being compatible with printing plates and inks.

In the process for solvent-free ink printing according to the invention, the entire printing apparatus is preferably kept in a closed environment to ensure that the printing apparatus, in particular the interior of the printing apparatus, is at constant temperature and humidity. For example, the printing equipment can be completely enclosed, and constant-temperature dehumidifying equipment is installed to ensure the temperature and humidity of the environment, so that the normal operation of printing and curing is ensured. The enclosing cover mode can adopt a movable enclosing cover so as to be convenient for opening and closing and convenient for plate changing operation; the humidity can be maintained at a set value of + -2% by configuring a dehumidifying device, and real-time humidity detection is performed at the unreeling, printing and reeling positions. The reason for using constant temperature and humidity is that the LED may be affected by ambient humidity and temperature, particularly ambient humidity, during the cationic photo-curing process, resulting in a decrease in the cationic photo-curing rate. The inventor controls the temperature and humidity of the whole printing environment by adopting a closed measure on the whole printing equipment in the production line, and the inventor knows that the best printing curing effect can be realized by controlling the temperature of the printing environment to be about 30 ℃ and the relative humidity to be about 40% through numerous experiments.

In the process method for solvent-free ink printing, the unreeling station in the step (2) preferably adopts double stations or multiple stations, so that automatic material turning and transferring actions can be continuously carried out when the rolled film is replaced. The advantage of this design is that when unreeling operation is still being carried out to one unreeling station, another unreeling station can carry out the operation of changing the roll membrane to guarantee that the polymer resin film is in continuous pan feeding always in the printing process, and the phenomenon of breaking can not appear.

In the process method for printing solvent-free ink, the feeding control unit controls unreeling and stabilizing feeding tension through double tension detection so as to ensure the quality of products. In the step (3), the tension of the rolled film during unreeling and the tension of the polymer resin film before printing are detected and controlled respectively, so that the rolled film can be stably unreeled and the film material can be stably stretched and flattened before printing the polymer resin film. This dual tension detection control is particularly important for polymeric resin films because polymeric resin films are more flexible, easily deformed, and more sensitive to tension than paper.

In the process method for printing the solvent-free ink, in the step (3), the position of the film edge of the polymer resin film is measured by utilizing a photoelectric sensor so as to obtain a deviation signal of the position of the film edge, the deviation signal is transmitted to a controller, and a mechanical executing mechanism corrects the deviation of the polymer resin film during operation according to the signal fed back by the controller. In the invention, each printing color group prints one color, and each printing color group needs overprinting to finish the printing of the whole pattern. The satellite printing of each printing color group ensures the basic precision of overprinting, and the sensor is utilized to finely adjust the position of the thin film to be printed in real time, so that the higher precision of overprinting can be ensured.

In the process method of solvent-free ink printing, the inking quantity of the printing plate is improved in the step (4) by a screening method, wherein screening refers to the process of making tiny dots on a field layout. Because of the full field printing, the ink may be unevenly colored, if the micro-dot treatment is performed on the field, the surface of the field printing plate is rougher, the ink adhesion amount is increased, the inking amount is increased, and the printing effect is better. In the application, the field printing refers to the process that the whole layout is covered on the printing ink, and the dot printing is a pattern formed by intersecting and combining countless dots with different colors in parallel.

In the process method for printing the solvent-free ink, the LED-UV lamp group light source is adopted for irradiation, the wavelength of the light source is controlled to be 200-500nm, the solvent-free ink can be quickly cured and dried on the polymer resin film, and the curing time is generally controlled to be within 0.05 seconds, more preferably within 0.02 seconds or less.

Compared with the traditional UV lamp (mercury lamp), the LED-UV lamp (or UVLED lamp) has the advantages that the luminous mode is electroluminescence: (1) The service life is extremely long and is generally more than 10 times that of a traditional mercury lamp type curing machine; (2) The cold light source has no heat radiation, the heat productivity is small, and the surface temperature rise of the irradiated product is low; (3) Instantly lighting, and instantly achieving 100% power ultraviolet output without preheating; (4) The energy is high, the light output is stable, and the irradiation uniformity effect is good; (5) customizable effective illumination zones; (6) no mercury nor ozone is generated; (7) Low consumption and power consumption which is only 10 percent of that of the traditional mercury lamp type curing machine.

Preferably, in the process of solvent-free ink printing of the present invention, the polymer resin film for printing is corona-treated before the roll film thereof is loaded into the unreeling station of the printing apparatus. Since the polymer resin film (such as polyolefin film) of the present invention is a nonpolar polymer, the surface tension is low, and the ink and the adhesive are difficult to adhere firmly. The corona treatment, namely electric shock treatment, can break chemical bonds of plastic molecules to degrade the plastic molecules, and a large amount of ozone can be generated during discharge, so that the plastic molecules can be oxidized by the ozone to generate groups with stronger polarities such as carbonyl groups, peroxides and the like, and the surface energy of the surface of the printed high polymer resin film is improved, so that the printed high polymer resin film has higher adhesiveness.

It is noted that, as a result of observation by a scanning electron microscope, the corona treatment does not roughen the surface of the printed polymer resin film, which is to be printed, and thus the printing ink and the adhesive are easily adsorbed. Corona treatment may rearrange the molecular structure of the surface of the substrate, creating more polar sites that facilitate the attachment of foreign objects.

In the corona treatment process, corona treatment is carried out on the surface of the high polymer resin film by a corona roller, the corona roller rolls on the surface of the film, and electric sparks of 5 kilovolts to 1.5 kilovolts are emitted simultaneously to form electric spark embossing corona on the surface of the film, and the corona on the surface of the treated film reaches 38 to 42Dines/cm.

In the process method for printing the solvent-free ink, the step (8) can further comprise the steps of slitting, packaging, warehousing and the like of the printed polymer resin film roll; the method may further comprise a polymer resin film preparation step, etc., before the corona treatment step. And will not be described in detail herein.

Compared with the prior art, the process method for flexography of solvent-free ink has the characteristics of high overprinting precision, suitability for high polymer resin films, low plate making cost, low ink consumption, high efficiency, almost no emission of VOCs and the like; in addition, in the process method of solvent-free ink flexography, the high-line anilox roller and the high-line printing plate are simultaneously used for printing, so that a printed matter is not easy to paste, and the effect is clear and the ink color is bright.

The developed solvent-free printing small envelope can approach the gravure printing effect, and brings better visual effect to printed matters.

Drawings

FIG. 1 is a schematic illustration of a printing apparatus used in the solvent-free ink printing method of the present invention;

FIG. 2 is a schematic flow chart of the solvent-free ink printing method of the present invention;

in the drawings, the meaning of each reference numeral is:

1. Center roller

2. First printing color group

21. LED-UV light curing lamp set of first printing color set

3. Second printing color group

31. LED-UV light curing lamp set of second printing color set

4. Third printing color group

41. LED-UV light curing lamp set of third printing color set

5. Anilox roller

6. Printing plate

7. Dehumidifier

8. Unreeling device

9. Winding device

10 LED electric cabinet

11. Water chiller

Detailed Description

One type of printing apparatus used in the solvent-free ink printing method of the present invention is shown in fig. 1. In the printing section, there are several printed colour groups distributed around the circumference of the central cylinder 1, for example three printed colour groups may be present: a first printing color group 2, a second printing color group 3 and a fourth printing color group 4, each printing color group comprising an anilox roller 5 and a plate roller 6, each printing color group being 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, respectively; the printing section is provided with a dehumidifier 7 and a temperature control device (not shown in the figures) to ensure constant temperature and humidity of the printing section. The unreeling device 8 is used for providing the printed macromolecule resin film for the printing part, the reeling device 9 is used for reeling the macromolecule resin film after printing is finished, the LED electric cabinet 10 is used for providing power for the LED-UV light curing lamp group, and the water chiller 11 is used for cooling the LED-UV light curing lamp group. In addition, the center roll 1 is provided with a mold temperature machine (not shown in the drawings).

Example 1

Printing is carried out according to the process flow shown in fig. 2 by adopting the printing equipment shown in fig. 1, and the specific process is as follows:

(1) Film rolling and mounting: loading and fixing a rolled film of the high polymer resin film to an unreeling station of printing equipment; the high polymer resin film is subjected to corona treatment before being formed into a rolled film and loaded to an unreeling station of printing equipment, a corona roller is used for rolling the surface of the film, and meanwhile, 1 ten thousand volts of electric sparks are emitted to form electric erosion embossing corona on the surface of the film, and the corona on the surface of the treated film reaches 38-42Dines/cm;

(2) Membrane connection: fixing the high polymer resin film in the rolled film at an unreeling station, automatically overturning and connecting the rolled film to the belt printing film; the unreeling station is two stations, when one unreeling station is used for unreeling operation, the other unreeling station can be used for replacing a roll film, so that the polymer resin film is always in continuous feeding in the printing process;

(3) Drawing and printing: the coiled film is unreeled by traction constant tension, and the stable centering of the printed high polymer resin film is ensured; the feeding control unit is used for respectively detecting and controlling the tension of the rolled film during unreeling and the tension of the polymer resin film before printing, so that the rolled film can be stably unreeled and the film material can be stably stretched and flattened before printing the polymer resin film; controlling the tension of the rolled film to be 35N and the tension of the polymer resin film to be 32N before printing;

(4) Printing: the high polymer resin film passes through three printing color groups which are arranged on the periphery of the central roller and synchronously rotate, each printing color group comprises a high-line-number anilox roller with the line number of 1000LPI and a printing plate with the line number of 133LPI, so that solvent-free ink is transferred from an ink cavity to the anilox roller, then transferred to the printing plate and finally transferred to the high polymer resin film; wherein each color set prints a single color solvent-free ink; the solvent-free ink used was produced by fast setting photosensitive New Material (Huiz) (SOGOOD) LDF38519 series;

(5) Curing: after printing solvent-free ink of a certain single color in each color group, irradiating by using an LED-UV lamp group light source to quickly cure and dry the solvent-free ink of the color on a high polymer resin film; wherein, the wavelength of the light source is controlled between 200 nm and 500nm, so that the solvent-free ink can be quickly cured and dried on the high polymer resin film, and the curing time is generally controlled at 0.02 seconds;

(6) Repeating the step (4) and the step (5) twice, so that the solvent-free ink printed by the three printing color groups is quickly cured and dried on the high polymer resin film, and printing the whole pattern on the high polymer resin film is completed;

(7) And (3) drawing a finished product: after pattern printing is finished, stably dragging the high polymer film to a winding station by constant tension; wherein the tension is controlled at 35N;

(8) And (3) rolling: the printed polymer resin film is smoothly rolled according to the designated tension and taper; wherein, the tension is controlled at 35N and the taper is controlled at 45%. Cutting, packaging and warehousing the printed high polymer resin film roll.

Example 2

Printing was performed in the process flow shown in fig. 2 using the printing apparatus shown in fig. 1, and the specific procedure was substantially the same as in example 1, except that the following differences were found:

carrying out corona treatment before the rolled film in the step (1) is put on a frame, rolling the surface of the high polymer resin film by using a corona roller, and simultaneously emitting electric sparks with the voltage of 1.1 kilovolts to form electric spark embossing corona on the surface of the film, wherein the corona on the surface of the treated film reaches 38-43Dines/cm;

When the drawing in and printing in the step (3), measuring the film edge position of the high polymer resin film by using a photoelectric sensor to obtain a deviation signal of the film edge position, transmitting the deviation signal to a controller, and correcting the deviation of the high polymer resin film during operation by a mechanical executing mechanism according to the signal fed back by the controller;

during the printing of step (4), in the process used (SOGOOD) to the brand solvent-free ink was added about 0.5wt% of an anthraquinone sensitizer.

Example 3

Printing was performed in the process flow shown in fig. 2 using the printing apparatus shown in fig. 1, and the specific procedure was substantially the same as in example 2, except that the following differences were found:

And (3) improving the inking quantity of the printing plate by a screening method in the printing process of the step (4), wherein the screening is to add small-dimension dots on the field layout in the printing plate manufacturing process.

Example 4

Printing was performed in the process flow shown in fig. 2 using the printing apparatus shown in fig. 1, and the specific procedure was substantially the same as in example 3, except that the following differences were found:

The printing equipment is surrounded and shielded by the whole machine, and the constant-temperature dehumidifying equipment is installed to ensure the temperature and humidity of the printing environment, so that the normal operation of printing and curing is ensured. The enclosing and shielding mode adopts a movable enclosing and shielding mode, so that the plate can be conveniently opened and closed, and the plate changing operation is convenient. Wherein, the temperature of the printing environment is controlled to be about 30 degrees, and the relative humidity is controlled to be about 40 percent.

Claims (10)

1. A process method for solvent-free ink printing of a high polymer resin film sequentially comprises the following steps:

(1) Film rolling and mounting: loading and fixing a rolled film of the high polymer resin film to an unreeling station of printing equipment;

(2) Membrane connection: fixing the high polymer resin film in the coiled film at an unreeling station, automatically overturning and connecting the coiled film to a tape printing film;

(3) Drawing and printing: unreeling the roll film by traction constant tension, and ensuring that the macromolecule resin film subjected to printing is stably centered;

(4) Printing: enabling the polymer resin film to pass through a plurality of printing color groups which are arranged on the periphery of a central roller and synchronously rotate, wherein each printing color group comprises a high-line-number anilox roller with the line number of 800-1300LPI and a printing plate with the line number of more than 130LPI, so that solvent-free ink is transferred from an ink cavity to the anilox roller, then transferred to the printing plate and finally transferred to the polymer resin film; wherein each of the print color sets prints a single color solvent-free ink;

(5) Curing: after each color group is printed with solvent-free ink with a certain single color, the solvent-free ink with the color is irradiated by an LED-UV lamp group light source, so that the solvent-free ink with the color is quickly cured and dried on the high polymer resin film;

(6) Repeating the step (4) and the step (5) to enable the solvent-free ink with other colors to be quickly cured and dried on the high polymer resin film until the whole pattern is printed on the high polymer resin film;

(7) And (3) drawing a finished product: after the pattern printing is finished, stably dragging the polymer film to a winding station by constant tension;

(8) And (3) rolling: and (3) flattening and rolling the printed high polymer resin film according to the designated tension and taper.

2. The process of claim 1 wherein the solventless ink of step (4) is a cationic photocurable composition employing a cationic reactive compound and a cationic photoinitiator, to which an anthracene-based sensitizer has been added.

3. The process according to claim 1, wherein the printing apparatus is in a closed environment to ensure that the printing apparatus, in particular the interior thereof, is in a constant temperature and humidity condition.

4. The process of claim 1 wherein the unwind station in step (2) is a duplex station to allow continuous automatic transfer of the web while the roll is being replaced.

5. The process according to claim 1, wherein in the step (3), the film roll is stably unwound and the film material before the polymeric resin film is printed can be stably stretched by respectively detecting and controlling the tension of the film roll during unwinding and the tension of the polymeric resin film before printing.

6. The process according to claim 1, wherein in the step (3), a photoelectric sensor is used to measure the position of the film edge of the polymer resin film to obtain a deviation signal of the position of the film edge, the deviation signal is transmitted to a controller, and a mechanical actuator corrects the deviation of the polymer resin film during operation according to the signal fed back by the controller.

7. The process of claim 1 wherein the inking level of the printing plate is improved in step (4) by screening, wherein screening refers to the creation of small dots on the solid surface.

8. A process according to claim 1, wherein the curing time in step (5) is controlled to be within 0.05 seconds, preferably within 0.02 seconds or less.

9. A process according to claim 3, wherein the internal ambient temperature of the printing apparatus is controlled at around 30 ℃ and the relative humidity is controlled at around 40%.

10. The process of claim 7, wherein the composition comprises, on a dry weight basis, 30-50 parts of the top layer, 30-50 parts of the middle layer, and 30-50 parts of the bottom layer.