Environmentally friendly inks used in label printing

As a carrier of product information transmission, the label has played a good role in the sales, use and guidance of the product, and has been widely used in various commodities. But traditional labels There are some problems in the printing process, such as organic solvent volatilization, wastewater discharge, etc., which are easy to directly pollute the environment, and materials that are not environmentally friendly and indirectly pollute the environment, which is urgently needed to be solved by label printing enterprises. Labels are currently emerging in the industry Green printing , the so-called green printing, not only requires the use of environmentally friendly inks and other consumables in all aspects of printing, but also the printing process and other aspects must be environmentally friendly and pollution-free. This is not only related to the long-term interests of the industry itself, but also to the coordination of the whole society. development of. This article mainly elaborates on environmentally friendly inks.
Water-based ink

The water-based ink is processed by composite grinding of water-soluble resin, organic pigment, solvent and related additives. The water-soluble resin is a binder of an aqueous ink, and a water-soluble acrylic modified resin is often used.
The biggest difference between water-based ink and solvent-based ink is that the solvent used is water instead of organic solvent, which can significantly reduce the VOC emissions during use, thereby reducing air pollution and having significant heat resistance and weather resistance. Advantage. Whether it is directly dispersed or dissolved or used in synthetic polymer emulsions, water exhibits excellent performance, which not only reduces the toxicity of printed residues, but also prevents printing static electricity from coming into contact with flammable solvents.
Water-based ink is non-toxic, non-corrosive, non-irritating and safe. It has high concentration, low dosage, low viscosity, good printing adaptability, stable performance, high adhesion fastness, low price and easy transportation. It is easy to adjust the operation before, during and after printing, and the printed products are colorful. Therefore, it is especially suitable for packaging and label printing of pharmaceuticals, electrical appliances, etc. It is recognized as an environmentally friendly printing material in the world.
However, problems such as long drying time and limited color saturation of aqueous inks require special attention.
1. Long drying time
The high level of resin, solvent and additives in water-based inks can affect the drying speed of the ink, so you can start with them to reduce drying time.
(1) A resin capable of increasing the drying speed can be added to the aqueous ink to improve the drying performance of the ink.
(2) The drying speed of the ink is changed by adjusting the ratio of the solvent to the deionized water, and generally increasing the ratio of the solvent accelerates the drying of the ink.
(3) In terms of additives, thickeners and pH will have an effect on the drying of the ink. Among them, the increase of thickener will increase the viscosity of the ink while reducing the drying speed of the ink. Increasing the pH of the ink will lower the viscosity of the ink, thereby reducing the initial dryness of the ink, so the pH of the ink is usually controlled within the range of 8 to 9.5 weakly alkaline.
(4) Drying of water-based ink is mainly carried out by hot air drying. The selection of a reasonable length of drying box can also ensure the quality and speed of drying.
2. Limited color saturation
Since the resin of the aqueous ink is mostly alkali-soluble, it is necessary to use an alkali-resistant pigment. Aqueous inks can be produced by selecting high-grade pigments with bright colors, low viscosity and stable system.
(1) The stability and transferability are not good, and an aqueous ink stabilizer can be added to prevent the aqueous ink from agglomerating and mold during storage and transportation.
(2) It is also possible to add a leveling agent, a slip agent, a crosslinking agent, etc., and to improve the performance of the aqueous ink to some extent by rationally using these additives.
At present, water-based inks are mostly used for air-conditioning indoor body labels that are relatively simple in printing color and relatively low in use environment.

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