Commonly used additives are: pH stabilizer, slow drying agent, defoamer, dilute agent and so on.
Water-based ink complies with environmental protection requirements. The product has non-toxic, non-corrosive, non-irritating odor, non-flammable, non-explosive, good safety, convenient transportation, high concentration, low dosage, low viscosity, good printing adaptability, and performance. Stable, high fastness, fast drying, good water resistance, alkali resistance and anti-wear performance after drying; easy to adjust during prepress, postpress and printing process, prints appear full of prints, bright colors, high gloss, Rich and rich, printed complex patterns can also reach rich levels, can print bright and high-gloss colors and other characteristics.
1 Application of water-based inks Water-based printing inks, the most current application areas are flexible printing and gravure printing. According to data, 95% of the US narrow-format flexographic paper prints use water-based inks, and 80% of gravure prints use water-based inks. Domestic development in recent years is also relatively fast, but there is still a big gap between the number of applications and foreign countries.
The application of water-based ink is an important factor affecting the printing quality. The control index of water-based ink includes fineness, viscosity, drying speed and pH.
In the flexographic printing, the transfer of water-based ink and the control of the amount of ink are borne by the anilox roller. Therefore, the fineness of the anilox roller must be selected according to the conditions of the product. In the field printing, an anilox roller of about 300 lines is generally selected. The thickness of the ink layer is relatively thick, and the fine-grained printing of 150 lines requires the selection of an anilox roller of 600 lines. The number of screen lines of an anilox roller is generally four times the number of printed lines in order to obtain better print definition and resolution.
Viscosity is the most important control indicator in water-based ink applications and is a property that prevents fluid flow. Since the viscosity directly affects the transferability of the ink and the quality of the printed matter, the control of the viscosity of the ink is very important. In the printing process, the viscosity of the water-based ink is too low to cause defects such as light color, dot enlargement, and uneven ink transfer. On the contrary, if the viscosity of the water-based ink is too high, the transfer performance of the ink is relatively poor, and a dirty plate is likely to appear. Paste and other ills.
Flexo-type water-based ink is generally used without dilution and its viscosity can range from 30′′ to 45′′/25°C (coating 4# cups). The viscosity of the flexo-based water-based ink for carton can be lower, as long as the water stabilizer is added regularly. The viscosity change can be basically controlled. The gravure water-based ink is conventionally diluted with a 1:1 diluent of ethanol and water, and the viscosity is generally controlled at 15" to 45"/25[deg.]C.
Water-based inks are generally alkaline (mainly dependent on amines), and the pH of water-based inks is generally controlled between 8.0 and 9.5. If the pH of the water-based ink is too high, it will affect the drying of the ink. Velocity; If the pH is too low, the viscosity of the ink increases, drying speed becomes faster, and the plate and the anilox roll become clogged, causing the layout to be dirty.
Drying of ink and wash is mainly volatile drying and infiltration drying. The drying performance of ink refers to the time required for the ink to dry after being transferred to the substrate. This is one of the important indicators for measuring the quality and performance of the ink. Therefore, controlling the drying performance of the ink is an important step to obtain good printing results. means.
The general principle of the drying speed of a flexographic water-based ink depends on the printing speed of the printing press, and the drying ink drying speed is: Under the existing conditions of the printing press, the ink is before the next printing color group and before rewinding or stacking It should be able to dry fully, but it cannot dry on the plate. If the ink dries too quickly, it will dry and build up on the plate and anilox roller, and it may clog the anilox roller, resulting in the loss or destruction of the halftone dots, and the leak in the solid part; if the ink has dried faster Slow, there will be print odor phenomenon, or in the case of multi-color overprint will cause the back of the dirty. (To be continued)
Water-based ink complies with environmental protection requirements. The product has non-toxic, non-corrosive, non-irritating odor, non-flammable, non-explosive, good safety, convenient transportation, high concentration, low dosage, low viscosity, good printing adaptability, and performance. Stable, high fastness, fast drying, good water resistance, alkali resistance and anti-wear performance after drying; easy to adjust during prepress, postpress and printing process, prints appear full of prints, bright colors, high gloss, Rich and rich, printed complex patterns can also reach rich levels, can print bright and high-gloss colors and other characteristics.
1 Application of water-based inks Water-based printing inks, the most current application areas are flexible printing and gravure printing. According to data, 95% of the US narrow-format flexographic paper prints use water-based inks, and 80% of gravure prints use water-based inks. Domestic development in recent years is also relatively fast, but there is still a big gap between the number of applications and foreign countries.
The application of water-based ink is an important factor affecting the printing quality. The control index of water-based ink includes fineness, viscosity, drying speed and pH.
In the flexographic printing, the transfer of water-based ink and the control of the amount of ink are borne by the anilox roller. Therefore, the fineness of the anilox roller must be selected according to the conditions of the product. In the field printing, an anilox roller of about 300 lines is generally selected. The thickness of the ink layer is relatively thick, and the fine-grained printing of 150 lines requires the selection of an anilox roller of 600 lines. The number of screen lines of an anilox roller is generally four times the number of printed lines in order to obtain better print definition and resolution.
Viscosity is the most important control indicator in water-based ink applications and is a property that prevents fluid flow. Since the viscosity directly affects the transferability of the ink and the quality of the printed matter, the control of the viscosity of the ink is very important. In the printing process, the viscosity of the water-based ink is too low to cause defects such as light color, dot enlargement, and uneven ink transfer. On the contrary, if the viscosity of the water-based ink is too high, the transfer performance of the ink is relatively poor, and a dirty plate is likely to appear. Paste and other ills.
Flexo-type water-based ink is generally used without dilution and its viscosity can range from 30′′ to 45′′/25°C (coating 4# cups). The viscosity of the flexo-based water-based ink for carton can be lower, as long as the water stabilizer is added regularly. The viscosity change can be basically controlled. The gravure water-based ink is conventionally diluted with a 1:1 diluent of ethanol and water, and the viscosity is generally controlled at 15" to 45"/25[deg.]C.
Water-based inks are generally alkaline (mainly dependent on amines), and the pH of water-based inks is generally controlled between 8.0 and 9.5. If the pH of the water-based ink is too high, it will affect the drying of the ink. Velocity; If the pH is too low, the viscosity of the ink increases, drying speed becomes faster, and the plate and the anilox roll become clogged, causing the layout to be dirty.
Drying of ink and wash is mainly volatile drying and infiltration drying. The drying performance of ink refers to the time required for the ink to dry after being transferred to the substrate. This is one of the important indicators for measuring the quality and performance of the ink. Therefore, controlling the drying performance of the ink is an important step to obtain good printing results. means.
The general principle of the drying speed of a flexographic water-based ink depends on the printing speed of the printing press, and the drying ink drying speed is: Under the existing conditions of the printing press, the ink is before the next printing color group and before rewinding or stacking It should be able to dry fully, but it cannot dry on the plate. If the ink dries too quickly, it will dry and build up on the plate and anilox roller, and it may clog the anilox roller, resulting in the loss or destruction of the halftone dots, and the leak in the solid part; if the ink has dried faster Slow, there will be print odor phenomenon, or in the case of multi-color overprint will cause the back of the dirty. (To be continued)
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