Method for solving color biting condition in integrated polyester system ink printing

Abstract

The invention provides a method for solving the color biting condition in integrated polyester system ink printing, which comprises the following specific steps: white water-based environment-friendly ink is adopted as white ink, and an ethanol solvent is used as a dissolving medium; mixing the ethanol solvent with the white ink, and uniformly stirring until the white ink is completely dissolved; color polyurethane integrated ink is adopted as the color ink, and a mixed solvent of ethyl ester and n-propyl ester is adopted as the solvent. And mixing the mixed solvent with the color pigment, and uniformly stirring until the color pigment is completely dissolved. And overprinting: in the printing process, the color ink is printed on the front color group, and then the white ink is subjected to color overlapping printing. And the white pigment is a mixed pigment of polyester and water-based color paste, so that the color purity and environmental protection performance of the white ink are ensured. In the preparation process of the white ink and the color ink, the mixing relative viscosity of the solvent and the pigment is controlled within 10-12 seconds. Through the steps, the color biting condition generated when the water-based ink and the integrated polyester system ink are mixed can be effectively solved, and stable printing quality is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of packaging printing, in particular to a method for solving the problem of color biting by integrating water-based ink with polyester system ink. Background Art

[0002] Color biting refers to the situation that the ink of the first color sticks to the printing plate of the second color when the ink of the first color is overprinted, which causes the pattern of the first color to be eroded. As time goes by, the ink of the second color changes color, and the hue and quality of the printed product are seriously affected. The white ink biting and ghosting failure of the integrated (polyester system) ink is common in the printing process, which not only fails to meet the quality standards of the product, but also causes great losses. As a result, a large number of packaging materials are scrapped. Summary of the invention

[0003] In view of the above defects or deficiencies in the prior art, the present invention provides a method for solving the color biting problem in the printing of integrated polyester system ink in order to solve the above problems in the prior art.

[0004] The main technical solution is: a method for solving the color biting problem in the printing of integrated polyester system ink, comprising the following steps:

[0005] Preparation of white ink: The white ink is a white water-based environmentally friendly ink, and the solvent is an ethanol solvent. The ethanol solvent is mixed with a white pigment resin and stirred evenly;

[0006] Preparation of color ink: the color ink is a color polyurethane integrated ink, the solvent is a mixed solvent of ethyl ester and n-propyl ester, the mixed solvent is mixed with the color pigment resin, and stirred evenly;

[0007] Overprinting: Printing white ink and color ink over each other.

[0008] The beneficial effects of the present invention are as follows: the present invention changes the solubility between white ink and other color inks to avoid secondary dissolution caused by inks of different color systems; while meeting the strength between the overprinted layers, the two inks are made insoluble in each other to achieve the purpose of preventing the two colors from biting each other, thereby eliminating such quality defects and improving the aesthetics of the product packaging. DETAILED DESCRIPTION

[0009] The present application is further described in detail below in conjunction with the embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown.

[0010] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0011] The method to solve the color biting problem in the integrated polyester system ink printing is as follows:

[0012] Preparation of white ink: White ink uses white water-based environmentally friendly ink and uses ethanol solvent as the dissolving medium. Mix the ethanol solvent with the white pigment and stir evenly until it is completely dissolved. The ethanol concentration in the solvent is 35-75%, and the specific selection is adjusted according to the actual application requirements.

[0013] Color ink preparation: The color ink uses a color polyurethane integrated ink, and the solvent is a mixed solvent of ethyl ester and n-propyl ester. Under fast-drying environmental conditions, the mass ratio of ethyl ester to n-propyl ester is 5:3; under slow-drying environmental conditions, the ratio is adjusted to 4:6. Mix the mixed solvent with the color pigment and stir evenly until it is completely dissolved.

[0014] Overprinting: During the printing process, the color ink is printed in the front color group, and then the white ink is overprinted. This can effectively avoid the color biting problem caused by mixing inks.

[0015] Pigment selection: White pigment is a mixture of polyester and water-based color paste, which ensures the color purity and environmental protection performance of white ink.

[0016] Viscosity control: During the preparation of white ink and color ink, the relative viscosity of the mixture of solvent and pigment is controlled between 10-12 seconds to ensure the fluidity and printability of the ink.

[0017] Through the above steps, the color biting problem caused by mixing water-based ink and integrated polyester system ink can be effectively solved to ensure stable printing quality.

[0018] Example 1: Under quick drying conditions

[0019] White ink preparation:

[0020] The white ink is a white water-based environmentally friendly ink, which uses the New Oriental water-based gravure composite ink (white), model 4411, produced by New Oriental Ink Company.

[0021] Ethanol solvent concentration: 35-75%.

[0022] White pigment: a mixture of polyester and water-based pigment.

[0023] Relative viscosity: 10-12 seconds.

[0024] Ink preparation:

[0025] The color ink is a colored polyurethane integrated ink, which adopts the New Oriental gravure composite ink produced by New Oriental Ink Company, model 3311NT-M.

[0026] Mixed solvent: The mass ratio of ethyl ester to n-propyl ester is 5:3.

[0027] Relative viscosity: 10-12 seconds.

[0028] Overprinting: Color ink is printed in the front color group, and then the white ink is overprinted.

[0029] Example 2: Under slow drying conditions

[0030] White ink preparation:

[0031] The white ink is a white water-based environmentally friendly ink, which uses the New Oriental water-based gravure composite ink (white), model 4411, produced by New Oriental Ink Company.

[0032] Ethanol solvent concentration: 35-75%.

[0033] White pigment: a mixture of polyester and water-based pigment.

[0034] Relative viscosity: 10-12 seconds.

[0035] Ink preparation:

[0036] The color ink is a colored polyurethane integrated ink, which adopts the New Oriental gravure composite ink produced by New Oriental Ink Company, model 3311NT-M.

[0037] Mixed solvent: the mass ratio of ethyl ester to n-propyl ester is 4:6.

[0038] Relative viscosity: 10-12 seconds.

[0039] Overprinting: Color ink is printed in the front color group, and then the white ink is overprinted.

[0040] The environmental conditions for fast drying and slow drying usually depend on temperature, humidity and ventilation conditions. Specifically:

[0041] Quick drying conditions

[0042] Temperature: Higher temperature (usually above 25°C).

[0043] Humidity: Low relative humidity (usually below 50%).

[0044] Ventilation: Good ventilation environment helps the solvent evaporate faster.

[0045] Application scenarios: Usually used in high-volume, fast-processing printing environments.

[0046] Slow drying conditions

[0047] Temperature: Lower temperature (usually between 15-25℃).

[0048] Humidity: High relative humidity (usually above 50%).

[0049] Ventilation: In poorly ventilated or controlled environments, solvents evaporate more slowly.

[0050] Application scenarios: Usually used in situations where longer operation or fine printing is required to avoid printing defects caused by too fast drying.

[0051] These conditions affect the drying speed of the ink. By adjusting the temperature, humidity and ventilation, the drying time of the ink can be controlled to meet different printing needs.

[0052] The two embodiments adjust the ratio of the color ink solvent to adapt to different drying conditions, thereby ensuring the printing effect and avoiding the color biting.

[0053] The white water-based ink of the present invention adopts water, ethanol and acrylic resin as solvents; the polyurethane integrated jacquard ink adopts ethyl ester and n-propyl ester as solvents. By reselecting the test resin type, the compatibility index between the white ink and other color systems is changed, the solubility is reduced, the fastness is guaranteed when the color stacking process is met, and the color biting (color dissolution) is eliminated.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The present invention changes the compatibility index between the white ink and other color inks, thus avoiding the secondary dissolution caused by the similar solubility between the two color inks. While satisfying the strength between the overprinted layers, the two colors are insoluble in each other, thus achieving the improvement of defects. This improvement aims to achieve the purpose of preventing color from biting each other, thereby eliminating such quality defects and achieving the effect of improving the aesthetics of the product packaging.

[0056] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A method for solving the problem of color biting in integrated polyester system ink printing. It is characterized in that The following steps are involved: Preparation of white ink: The white ink is a white water-based environmentally friendly ink, and the solvent is an ethanol solvent. The ethanol solvent is mixed with a white pigment resin and stirred evenly; Preparation of color ink: The color ink is a color polyurethane integrated ink, and the solvent is a mixed solvent of ethyl ester and n-propyl ester. The mixed solvent is mixed with the color pigment resin and stirred evenly; Overprinting: Printing white ink and color ink over each other.

2. A method for solving the problem of color biting in integrated polyester system ink printing according to claim 1, Features: The white pigment is a mixed pigment of polyester and water-based color paste.

3. A method for solving the problem of color biting in printing of integrated polyester system ink according to claim 1, Features: The concentration of the ethanol solvent is 35-75%.

4. A method for solving the problem of color biting in integrated polyester system ink printing according to claim 1, Features: The mass ratio of ethyl ester to n-propyl ester in the mixed solvent is 5:3 under fast-drying conditions and 4:6 under slow-drying conditions.

5. The method for solving the problem of color biting in integrated polyester system ink printing according to claim 1, Features: During the preparation of the white ink and the color ink, the relative viscosity of the mixture of the solvent and the pigment is 10-12 seconds.