KR102565983B1 - Eco-friendly ink composition for flexographic printing - Google Patents

Abstract

The present invention relates to an eco-friendly ink composition for flexographic printing and a printing method using the same, and by using an eco-friendly water-based ink (AQUA-FLEX) composition capable of self-crosslinking, eco-friendly and economical printing is possible for the environment and human body. And, it relates to an eco-friendly ink composition for flexo printing capable of printing with high efficiency by using a high number of anilols rolls and inspecting the printing state using an automatic viscosity system and a color difference meter, and a printing method using the same. Eco-friendly water-based ink (AQUA-FLEX) capable of self-crosslinking according to the present invention does not contain volatile solvents for VOC and fire preparation, and the ink has physical properties (adhesion, water resistance) problems after passing through a drying chamber during printing It is possible to improve the solubility of anilox roll and resin plate in water without it.

Description

Eco-friendly ink composition for flexographic printing {Eco-friendly ink composition for flexographic printing}

The present invention relates to an eco-friendly ink composition for flexographic printing and a printing method using the same, and more particularly, by using an eco-friendly water-based ink (AQUA-FLEX) composition capable of self-crosslinking (SELF CROSSLINKING), it is environmentally friendly to the environment and the human body. , Eco-friendly ink composition for flexographic printing that can be printed economically and can be printed with high efficiency by using an anilox roll of high number and inspecting the printing state using an automatic viscosity system and color difference meter and a printing method using the same will be.

The use of packaging materials to protect food is increasing, and food packaging materials do not stop at simply protecting the contents, but increase the advertising effect on the outside and need to be harmless to the human body even when food is in direct contact on the inside.

Recently, as consumers seeking natural, organic, eco-friendly, etc. increase, packaging materials having various functionalities are being developed to reflect this trend in the field of food packaging materials.

These packaging materials are generally manufactured through gravure printing, and 50 to 70% of volatile solvents such as MEK, TOL, and EA are used for gravure film printing, and volatile solvents (alcohol) are used for flexo film printing, and these solvents are excessive There is a risk of VOC generation and fire accidents due to its use.

Specifically, these organic solvents are released into the air during the ink drying process and become air pollutants, are directly exposed to workers and are harmful to the human body, and pose a risk of fire during printing. In particular, if such an organic solvent remains in the packaging material, there is a problem that hygienic prints cannot be obtained and it is harmful to the human body.

On the other hand, the flexographic printing method belongs to the type printing method, but is widely used together with gravure printing in the field of packaging printing and is treated separately. In this method, rubber or photosensitive resin plate, which is softer than normal letterpress, is used as a plate material, and ink is a solvent-based or water-based ink having a low viscosity similar to that of gravure ink.

Compared to other types of printing, especially gravure printing, flexo printing has many advantages such as simple plate making, low cost, easy copying of plates, partial exchange of plates, etc., and its economic feasibility, suitable for printing in small lots. do. Since the ink coating film is thin and water or alcohol is used, residual solvent is less or harmless, so a clean package working environment can be realized.

Flexo ink uses low-viscosity, high-concentration ink. The low-viscosity can accurately reproduce the image, and the circulation of ink is good, so the workability is improved. The impact of degradation is small.

Recently, water-based ink is used even for non-absorbent printed materials such as films and aluminum foils due to the need for safety against fire, hygienic working environment, and reduction of residual solvents in printed materials. In addition, it is less affected by temperature and humidity in the printing process and performs stable printing work even under relatively wide printing conditions.

However, commercialization is difficult due to insufficient re-dissolving and insufficient drying in water-based flexo printing, and there is a problem in that the visual quality of the design is deteriorated due to the occurrence of joints in the flexo printing machine resin plate. There is an ongoing demand.

Korean Registration No. 10-2160953 (September 23, 2020) Korean Registration No. 10-2068154 (January 14, 2020) Korean Publication No. 10-2022-0153586 (November 18, 2022)

As a result of intensive research to solve the problems of the prior art associated with flexographic printing ink, the present inventors, as described below, use a self-crosslinking type eco-friendly ink composition and improve the flexographic printing process, thereby exhibiting excellent physical properties and economical It was discovered that printing is possible in this method and came to complete the present invention.

Accordingly, an object of the present invention is to provide a self-crosslinking eco-friendly ink composition that exhibits excellent physical properties and can be printed in an economical manner and a flexographic printing method using the same.

The object of the present invention as described above, on one side, 20 to 23% by weight of pigment, 22 to 25% by weight of polymer of ethenylbenzene and 2-propenoic acid, 3 to 5% by weight of polyurethane prepolymer, 0 to 3% by weight of additives , And it can be achieved by a self-crosslinking eco-friendly flexo printing ink composition comprising 50 to 55% by weight of water.

Eco-friendly water-based ink (AQUA-FLEX) capable of self-crosslinking according to the present invention does not contain volatile solvents for VOC and fire preparation, and the ink has physical properties (adhesion, water resistance) after passing through a drying chamber during printing ) It is possible to improve the water solvency of the anilox roll and the resin plate without any problem, and according to the method of the present invention, the amount of coating film is reduced compared to the concave printing (gravure) by convex printing, thereby reducing the required amount of drying heat. The use of solvents can be reduced by using high-viscosity ink, and the printing speed can be improved by using an anilox roll of 800 LPI or higher. By adopting an automatic viscosity system that automatically adjusts the viscosity and an inspection method using a color difference meter during inspection, the defect rate can be reduced and usefulness can be achieved to increase the accuracy of the judgment of printing errors. In the case of resin plate production in the past, a seam inevitably occurs when the resin plate is attached. In order to eliminate the seam, a white line plate is additionally manufactured and filled at the joint connection part by using the remaining power to eliminate the seam, and a printout close to gravure printing is realized. this is possible

1 is a printing process diagram using an eco-friendly ink composition for flexo printing according to the present invention.
2 shows the structure of a resin plate attached to a cylindrical sleeve.
3 is a photograph showing a seam occurrence area during printing.
4 and 5 are exemplary views of a white line plate of a resin plate.
6 is a diagram showing color coordinates according to Lab values.
7 is a photograph of a printed product produced by the method of the present invention.

The present invention, in one aspect, 20 to 23% by weight of the pigment, 22 to 25% by weight of the polymer of ethenylbenzene and 2-propenoic acid, 3 to 5% by weight of polyurethane prepolymer, 0 to 3% by weight of additives, and water It provides a self-crosslinking eco-friendly flexo printing ink composition, characterized in that it contains 50 to 55% by weight.

In a further aspect of the present invention,

In the flexographic printing method using a convex resin plate,

a) manufacturing a self-crosslinking type eco-friendly ink for flexo printing;

b) an unwinding process of mounting a printed material made of paper, PE, PET, nylon (NY) or OPP film on an unwinder;

c) a corona treatment process in which the inner surface of the fabric is corona treated with a corona treatment machine at 36 to 40 DYNE and additionally 4 kW corona discharge treatment is performed;

d) an ink transfer step of supplying the self-crosslinking eco-friendly ink for flexo printing to a fabric through a convex resin plate through an anilox roll having a high number of 800 LPI or more;

e) first drying the ink transferred to the fabric by passing it through a drying chamber;

f) obtaining a printed matter by secondary drying the ink dried in the drying chamber through an arcuate chamber;

g) a rewinding process of winding the printed matter dried through an arcuate chamber into a roll through a rewinder; and

h) an inspection process of inspecting the printed state on the outer surface of the printed material using a color difference meter;

The self-crosslinking eco-friendly ink for flexo printing contains 20 to 23% by weight of a pigment, 22 to 25% by weight of a polymer of ethenylbenzene and 2-propenoic acid, 3 to 5% by weight of a polyurethane prepolymer, 0 to 3% by weight of additives, and Contains 50 to 55% by weight of water,

The polyurethane prepolymer is hexanedioic acid, hexanediol, dimethylolpropionic acid, methylenebis (cyclohexane isocyanate) polymer, triethylamine salt (Hexanedioic acid, hexanediol, dimethylolpropionic acid, methylenebis (cyclohexane-isocyanate) polymer, triethylamine salt, C ₃₆ H ₇₁ N ₃ O ₁₂ ),

b) prior to the unwinding step, including a step of filling the joint connection portion of the convex resin plate with a white line plate;

The additive provides a flexo printing method, characterized in that at least one selected from the group consisting of anti-slip agents, anti-blocking agents, dispersants, anti-foaming agents, waxes and antioxidants.

Hereinafter, a self-crosslinking eco-friendly ink composition for flexo printing according to the present invention and a printing method using the same will be described in more detail with reference to the accompanying drawings.

The terms or words used in this specification and claims are not limited to the usual or dictionary meanings, and the inventor can properly define the concept of the term in order to explain his or her invention in the best way. Based on this, it should be interpreted as a meaning and concept consistent with the technical spirit of the present invention. Therefore, since the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, it is understood that there may be various equivalents and modifications that can replace them at the time of this application. shall.

In the present invention, the self-crosslinking eco-friendly ink composition for flexographic printing (hereinafter, for convenience, depending on the context, it may also be abbreviated as "self-crosslinking eco-friendly ink", "eco-friendly ink" or "ink", and the "ink composition" is For convenience, it is also referred to as "ink".) This is expressed as a part by weight or % by weight, and may include an unpracticable part in which the sum of individual components exceeds 100% by weight according to the calculation formula, but such excess or unpracticable part It is obvious that it is not included in the scope of the present invention, and in particular, corrections clarifying this in the claims, for example, corrections adding a proviso such as the range exceeding 100% by weight is excluded from the scope of the present invention It is only to clarify the unclear description, and it is obvious that it does not affect the nature or scope of the present invention.

1 is a printing process diagram using a self-crosslinking eco-friendly ink composition according to the present invention, FIG. 2 shows the structure of a resin plate attached to a cylindrical sleeve, FIG. 3 is a photograph showing a joint area during printing, FIG. 4 and 5 is an exemplary view of a white line plate on a resin plate, FIG. 6 is a view showing color coordinates according to Lab values, and FIG. 7 is a photograph of a printed material manufactured by the method of the present invention.

Self-crosslinking eco-friendly ink composition for flexo printing

The self-crosslinking eco-friendly ink composition for flexographic printing according to the present invention contains 20 to 23 wt% of a pigment, 22 to 25 wt% of a polymer of ethenylbenzene and 2-propenoic acid, 3 to 5 wt% of a polyurethane prepolymer, and 0 to 0 additives. 3% by weight, and 50 to 55% by weight of water.

The above composition is an eco-friendly water-based ink (AQUA-FLEX) capable of self-crosslinking without volatile solvents for VOC and fire preparation.

Pigments included in the ink composition of the present invention are materials for expressing colors, and may include organic pigments, inorganic pigments, and the like. The pigment is not particularly limited, and commonly used pigments can be suitably used in the present invention.

Specifically, for example, azo-lake, insoluble azo, condensed azo, phthalocyanine, titanium oxide, carbon black, calcium carbonate, aluminum powder, bronze powder, solvent dye, etc. Depending on the quality, it can be appropriately selected and used.

The pigment is CI Pigment Red 146 (Cas No. 5281-04-09) as a red pigment, carbon black, CI Pigment Blue, CI Pigment Yellow 13, CI Pigment Yellow 14 as a black pigment, or TiO ₂ CR-50 as a white pigment. AS may be more preferable.

The polymer of ethenylbenzene and 2-propenoic acid (2-propenoic acid polymer with ethenylbenzene) serves as a binder for adhering the flexo ink composition to the printed material, and increases the adhesion between the ink and the printed material , improve the quality of flexographic printing.

For example, the self-crosslinking eco-friendly ink composition for flexographic printing of the present invention is printed on the inner surface of an OPP film, PET film, or nylon film or on the surface of paper, and the polymer can provide excellent adhesion to various materials, , In particular, Cas No. It may be desirable to use 22-25% by weight of the product of 25085-34-1.

If the resin content is out of the above range, not only the adhesive strength of the ink is significantly reduced, but also a problem may occur in the viscosity of the ink.

In addition, the polyurethane prepolymer is hexanedioic acid, hexanediol, dimethylolpropionic acid, methylene bis (cyclohexane isocyanate) polymer, triethylamine salt (Hexanedioic acid, hexanediol, dimethylolpropionic acid) as components for heat resistance and adhesion of the resin. , methylenebis (cyclohexaneisocyanate) polymer, triethylamine salt, C ₃₆ H ₇₁ N ₃ O ₁₂ , Cas No. 71173-87-0) may be used, and based on the total weight of the self-crosslinking ink composition of the present invention, 3 It is preferable to use ~5% by weight, and if it is out of this range, there may be a problem with interlayer adhesion (De-lamination) in the subsequent process.

As the additive, at least one selected from the group consisting of anti-slip agents, anti-blocking agents, dispersants, anti-foaming agents, waxes and antioxidants may be used to assist flow, surface tension, slurry consistency and gloss characteristics of aqueous ink.

The additive may be preferably included in an amount of 0 to 3.0% by weight based on the total weight of the composition.

As long as the anti-slip agent is commonly used, it can be suitably applied in the present invention as well. Examples include, but are not limited to, erucamide, oleamide, and steamide.

Antiblocking agents can be suitably applied in the present invention as long as they are commonly used as components for preventing blocking that interferes with work by sticking to each other. For example, although not limited to these, wax, calcium carbonate CaCO ₃ , talc (Talc), silica (SiO ₂ ), aluminum silicate, and silicon beads and the like may be mentioned. These antiblocking agents can be used alone or in combination of two or more.

The dispersant is made from a polymeric dispersant, for example polyvinyl butyral, or blended with, for example, a nitrocellulose base.

The antioxidant is added to delay yellowing of the polyurethane resin and ultimately prevent or delay color discoloration of the ink. The antioxidant can be suitably used in the present invention as long as it is commonly added to polyurethane resins, but is not limited thereto, and tri-(2,4-di-tert-butylphenyl) phosphite (tri-(2 ,4-di-tert-butylphenyl)phosphite).

When the content of the additive is out of the range set above, anti-blocking properties, dispersibility, anti-oxidation, and slip inhibition may not be sufficient, and adhesive performance and mechanical properties may be deteriorated.

In a further aspect, the present invention provides a flexographic printing method using the self-crosslinking eco-friendly ink composition for flexographic printing.

FLEXO printing according to the present invention is a type of block printing, using a flexible block resin plate, using an aqueous or alcohol ink composition, applying water-based ink to an anilox roll so that it is transferred to the resin plate, and using a resin plate. The ink of the embossed part is transferred to the film (fabric) and printed, and the ink on the pattern periphery is pushed out with strong pressure and printed thickly.

As shown in FIG. 1, the flexographic printing method using the self-crosslinking eco-friendly ink composition for flexographic printing according to the present invention is largely eco-friendly flexographic ink manufacturing process, unwinding process, corona treatment process, ink transfer process, and ink drying for each color. process, secondary drying process, rewinding process and printing inspection process. Hereinafter, each step is described in detail.

a) Eco-friendly flexo ink manufacturing process

An ink for flexographic printing is prepared using the self-crosslinking type eco-friendly ink composition for flexographic printing as described above.

The self-crosslinking (SELF CROSSLINKING) eco-friendly water-based ink (AQUA-FLEX) does not contain volatile solvents for VOC and fire preparation.

In addition, the ink can improve the water solubility of the anilox roll and the resin plate without any problem in physical properties (adhesion, water resistance) after passing through the drying chamber during printing.

b) Unwinding process

As a part for mounting OPP film, PET film, nylon film, and paper, which are printed materials, on the unwinder, the maximum printing width may be preferably Max 1,270 mm.

On the other hand, the flexo printing press plate type is a convex plate type, and printing is performed by attaching a resin plate to a cylindrical sleeve. 2 shows the structure of a resin plate attached to a cylindrical sleeve. When attaching the resin plate, a seam inevitably occurs, and during printing, a seam occurrence portion appears as shown in FIG. 3 . 3 is a photograph showing a seam occurrence area during printing. A problem of deterioration in design visual quality may occur due to the occurrence of joint joints in the flexo printing machine resin plate.

In order to prevent this, it may be desirable to make a white line board using the remaining power and then attach it to the seam to fill the seam.

4 and 5 are exemplary views of a white line plate of a resin plate. 7 is a photograph of a printed product produced by the method of the present invention. When connecting the resin plate of the flexo printing machine, the connection part is moved and the remaining power is used to fill it with a white line plate, so it is possible to realize a print that is close to gravure printing without a sense of heterogeneity.

c) Corona treatment process

The inner surface of the film is corona treated at 36 to 40 DYNE using a corona treatment machine, and additionally 4 kW corona discharge treatment is performed to improve the adhesion of the ink.

Corona discharge is generated under normal pressure conditions, and air is generally used as the ionized gas. The advantage of air as an ionizing gas in corona discharge is that the operation can be carried out in an apparatus open to the outside, so that, for example, a film can be continuously introduced between the discharge electrodes.

d) ink transfer process

As a device for supplying self-crosslinking type eco-friendly ink through a high number anilox roll of 800 LPI or higher, the self-crosslinking type eco-friendly ink for flexographic printing transferred to anilox plate is transferred to a resin plate by scratching a dog knife.

At this time, it is preferable to use an anilox roll of 800 LPI or more, and when using an anilox roll with high water content, it is possible to improve the printing speed by reducing the amount of printing film, and printing using high water anilox can reduce ink consumption by 20 to 30% compared to gravure It can be.

In addition, it may be desirable to adjust the viscosity of the ink using an automatic viscosity system, and it is possible to apply a high-concentration and low-viscosity ink.

The viscosity of ink for each color is adjusted to 10 ~ 11 SEC as Rigosha Jancup No. 4, and it may be desirable to manage the viscosity by automatically correcting the measured value manually and the viscosity on the machine.

The maximum speed of the flexo film printing machine can be realized at 300 m/MIN.

e) Ink drying (primary) process

Ink transferred by color is primarily dried through a drying chamber. It may be desirable to optimize by setting the drying chamber temperature to 75° C. and the wind speed to 65 m/s.

The print frequency for each color is 9 degrees, and the colors are shown in Table 1 below. The ink transferred to the film is dried through the chamber and only the solid content remains.

division 1 degree second degree third degree 4 degrees 5 degrees 6 degrees 7 degrees 8 degrees 9 degrees 10 degrees color black county office mark blue Red yellow Ottogi Hwang white 1 white 2

f) Ink drying (secondary) process

The ink dried in the drying chamber is secondarily dried through the arcuate chamber at the top of the C.I DRUM. At this time, the drying conditions may be a drying chamber temperature of 90 ° C. and a wind speed of 50 m/s. As the dryer, the maximum wind speed of the drying chamber is up to 120 m/s, the temperature of the cooling water of the cooler is 18 ° C to 22 ° C, and the cooling roller is a chrome-plated roller that supplies water to process cooling by water cooling. contains

By finally drying the overlapped ink in this way, the adhesion of the ink is strengthened.

g) Rewinding process

After passing through the arcuate chamber, the secondary dried prints go through the final rewinder and are wound into rolls.

h) print inspection process

In the above step, the printed state on the outer surface is inspected using a color difference meter. At this time, the printed fabric is inspected through relative comparison and quantitative digitization with the printing limit sample using the print color difference meter.

In the case of spot color SPOT COLOR, use an EXACT color difference meter and compare the △E value by comparing the print limit sample and the actual printed area with each other (condition: light source D50, angle 2˚). 6 is a diagram showing color coordinates according to Lab values. When the color of a product is measured using a color difference meter, Lab value is displayed as L value, a value, and b value. The L value is the data measured for reflectance and represents the same brightness as human vision and is displayed as a value from 0 to 100. If it is marked as -a, it means that it is close to green. The b value is a value that compares the degree by making ultramarine blue and yellow on one axis. The higher the +b value, the closer it is to yellow, and the larger the -b value, the closer it is to ultramarine blue.

The △E value is calculated by the following formula. Subtract the measured value of printed matter from the standard value measured using a colorimeter, square the L, a, and b items, add each value, and then apply the square root to △E is called value The management standard for the ΔE value is managed within 3, and in the case of colors that are difficult to match, it may be desirable to manage within ΔE 6 while managing the quantitative value.

When manufacturing a pouch, it is possible to achieve the usefulness of reducing the defect rate by using a color difference meter to detect printing errors and increasing the accuracy of determining printing errors.

Subsequently, as a subsequent step after the printing process, a process of non-solvent drying or T-DIE laminating may be performed.

The self-crosslinking (SELF CROSSLINKING) eco-friendly water-based ink (AQUA-FLEX) according to the present invention does not contain volatile solvents for VOC and fire preparation, and the ink has physical properties (adhesion, water resistance) after passing through a drying chamber during printing ) It is possible to improve the solubility in water of anilox rolls and resin plates without any problems.

In addition, according to the method of the present invention, the amount of coating film required for convex printing is smaller than that of intaglio printing (gravure), and the amount of drying heat required is reduced. It is possible to improve the printing speed, printing using high-quality anilox can reduce ink usage by 20-30% compared to gravure, and the automatic viscosity system that automatically adjusts the ink viscosity and the inspection method using the color difference meter By adopting it, it is possible to reduce the defect rate and achieve usefulness that can increase accuracy according to the determination of printing errors.

Example

Hereinafter, the present invention will be described in more detail with reference to examples. However, these embodiments are intended to explain the present invention with specific examples, and are not intended to limit the present invention thereby.

Example 1: Preparation of Ink Composition

Ink was prepared by mixing the ink compositions according to the following Tables 2 to 6 by a conventional method. Table 2 is AQUA-FLEX black, Table 3 is AQUA-FLEX 39 blue, Table 4 is AQUA-FLEX 16 red red, Table 5 is AQUA-FLEX 23 yellow, and Table 6 is AQUA-FLEX white.

ingredient content (%) Carbon Black 20-23 2-propenoic acid polymer with ethylenebenzene 22-25 Polyurethane Prepolymer 3 to 5 Dispersant&Antiform 0 to 3 Water 50 to 55

ingredient content (%) C.I Pigment Blue 15:3 20-23 2-propenoic acid polymer with ethylenebenzene 22-25 Polyurethane Prepolymer 3 to 5 Dispersant&Antiform 0 to 3 Water 50 to 55

ingredient content (%) C.I Pigment Red 146 20-23 2-propenoic acid polymer with ethylenebenzene 22-25 Polyurethane Prepolymer 3 to 5 Dispersant&Antiform 0 to 3 Water 50 to 55

ingredient content (%) C.I. PIGMENT YELLOW 13 10 to 12 CI PIGMENT YELLOW 14 10 to 12 2-propenoic acid polymer with ethylenebenzene 22-25 Polyurethane Prepolymer 3 to 5 Dispersant&Antiform 0 to 3 Water 50 to 55

ingredient content (%) TiO2 35 to 40 2-propenoic acid polymer with ethylenebenzene 22-25 Polyurethane Prepolymer 3 to 5 Dispersant&Antiform 0 to 3 Water 40-45

The ink dried in the chamber was secondarily dried. The printed matter dried through the drying chamber was rolled into a roll through a final rewinder, and the printed state on the outer surface of the outer layer film was inspected using a colorimeter. 7 is a photograph of a printed product produced by the method of the present invention.

Test Example 1: Confirmation test of printing state

The print according to Example 2 was measured at three locations: black, star 186C, and star 108C, which are the unique colors of the print product, to confirm the printing state, and the results are shown in Table 7 below. Table 7 shows the ΔE values for relative comparison of the printed areas with each other.

color black Grade 186C Byeolhwang 108C division L a b △E L a b △E L a b △E standard value 10.30 1.04 1.68 - 46.12 73.41 50.91 - 84.66 3.32 92.05 - Measures 9.93 1.04 1.62 0.14 45.89 73.01 50.54 0.34 84.89 3.30 92.28 0.11 10.73 0.99 1.68 0.19 46.02 73.24 50.77 0.06 84.52 3.52 92.36 0.16 10.23 1.08 1.74 0.01 46.44 73.97 51.41 0.68 84.57 3.14 91.51 0.33

The color value measured from the results of Table 7 is within ΔE 3 and is considered to be at a similar level to that of the printed sample.

Test Example 2: physical property test

The physical properties of the printed material of Example 2 were tested twice and the results are shown in Table 8 below. As a comparative product, commercially available alcohol-type flexo ink was used.

test item Example 2
(1st round) Example 2
(2nd round) Comparative Example 1 test method Lightness 91.02 91.24 89.25 Color difference meter L value (printed material + deposition) ink adhesion Good Good Good Transparent OPP tape (50mm) Ink adhesion strength Good Good Good forced separation Sealing strength (kg/15mm) 1.238 1.280 1.165 tensile strength machine

As confirmed from the above test results, the printed material according to the present invention was generally superior to that of the comparative example in physical properties such as whiteness, ink adhesion, ink adhesion strength and sealing strength.

Therefore, the self-crosslinking eco-friendly water-based flexographic printing method of the present invention can improve air pollution without using the organic solvent currently used in the currently generalized grivia printing method by using the above composition and the specified method. It is confirmed that it is an absolutely excellent printing method.

As such, the present invention has been described with examples of preferred embodiments of the present invention through drawings and specifications, but it is obvious that various modifications and equivalent implementations are possible for those skilled in the art.

Claims (4)

20 to 23% by weight of pigment, 22 to 25% by weight of polymer of ethenylbenzene and 2-propenoic acid, 3 to 5% by weight of polyurethane prepolymer, 0 to 3% by weight of additives, and 50 to 55% by weight of water , The polyurethane prepolymer is hexanedioic acid, hexanediol, dimethylolpropionic acid, methylenebis (cyclohexane isocyanate) polymer, triethylamine salt (Hexanedioic acid, hexanediol, dimethylolpropionic acid, methylenebis (cyclohexane-isocyanate) polymer, triethylamine salt, C ₃₆ H ₇₁ N ₃ O ₁₂ );
The pigment is CI Pigment Red 146 as a red pigment, carbon black, CI Pigment Blue, CI Pigment Yellow 13, CI Pigment Yellow 14 as a black pigment, or TiO ₂ as a white pigment,
The additive is a self-crosslinking eco-friendly flexo printing ink composition, characterized in that at least one selected from the group consisting of anti-slip agents, anti-blocking agents, dispersants, anti-foaming agents, waxes and antioxidants. delete delete delete