New development of the most popular environmental

2022-07-26
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New development of environmental friendly gravure printing inks since the reform and opening up, China's packaging and printing industry, especially the flexible packaging industry, has developed rapidly. However, due to the influence of various factors, at present, more than 95% of the products in the flexible packaging industry use gravure printing, and most gravure printing inks still use low boiling point volatile organic compounds as the main solvent and diluent. During the printing process, It is inevitable to release a large number of toxic organic compounds into the air, which has a serious impact on human health and the environment. It is imperative to develop gravure printing inks without (or low content) organic compounds. Water based inks and alcohol soluble inks have become the development direction of gravure printing inks because of their low pollution and pollution

Yip's Ink Co., Ltd. complies with the needs of market development and strives to develop and improve environmental friendly inks. It has successfully launched a series of environmental friendly inks, such as water-based inks and alcohol soluble inks

water based inks

for a long time, gravure printing inks have been dominated by benzene soluble inks. A large number of aromatic solvents (such as toluene) are used in the printing process, causing great harm to operators and the environment. In addition, toluene is very easy to remain in the dry ink film, resulting in different degrees of solvent residue in packaging prints. The development of water-based ink is an important way to replace solvent based ink

water based ink, also referred to as water-based ink, is made of water-soluble resin, advanced pigments, solvents and additives by ~d-i- grinding. The water-soluble resin mainly acts as a binder in the ink, so that the pigment particles are evenly dispersed, giving the ink a certain fluidity, and producing a certain adhesion with the substrate, so that the ink forms a uniform film after printing. After that, the solvent in the ink gradually volatilizes, and the ink layer is completely dry. Gravure printing has high requirements for ink viscosity, adhesion, gloss, dryness and printability

water soluble resins of water-based ink binder mainly include rosin modified maleic acid resin, urethane resin, styrene modified maleic acid resin, water-based amino resin and water-soluble acrylic acid modified resin. Among them, water-soluble acrylic modified resin is the best. It has significant advantages in gloss, weather resistance, heat resistance, water resistance, chemical resistance and pollution resistance. It can show excellent performance when directly dispersing and dissolving or synthesizing polymer lotion

the solvents used in water-based inks are mainly pure water and a small amount of alcohols, such as ethanol, butanol, isopropanol, etc. The role of alcohol is to assist water to enhance the ability of dissolving resin, improve the dispersion of pigments, accelerate penetration and inhibit foaming

in order to improve the performance of water-based ink, some additives need to be added. The commonly used additives for water-based ink include defoamer, ink stabilizer, dispersant, preservative, leveling agent, reinforcing agent and cross-linking agent

for example, the GAW series of water-based inks introduced by Ye's inks are mainly composed of water-based resins and high-grade pigments. They are suitable for paper gravure printing and have the characteristics of excellent gloss, good friction resistance and low odor. FBW series products are made of high-grade pigments, aqueous acrylic resin and various additives. They are suitable for laminated, satellite and unit type flexographic printing machines. The machine speed can reach 120m/min. they are mainly used for high-speed digital roller flexographic color hierarchical printing. They are high-precision ink for flexible printing of cigarette labels, wine labels and other packaging products. FAW series is mainly applicable to the packaging and printing of corrugated boxes and other paper products

because the solvent used in the water-based ink is mainly water and does not contain other organic solvents, its biggest feature is that it does not pollute the environment, and can eliminate the harm of some toxic substances in the solvent-based ink to the human body and the pollution to the package contents. In addition, the product has the advantages of high gloss, bright ink color, high concentration, wear resistance, excellent smoothness and so on. The heavy metal content of GAW has been tested by SGS company and conforms to 94/62/EC, CONEG and other standards. It is especially suitable for the printing of packaging, decoration and printing products with strict sanitary conditions, such as food, medicine and cosmetics

although water-based inks can achieve the goal of environmental protection as an alternative system of solvent inks, due to their slow drying speed, poor corrosion resistance and corrosion resistance, their printing performance and quality on film substrate materials still can not meet the standard of solvent based gravure inks. Therefore, most of the water-based inks used in the market can only be used for paper and corrugated board printing, and it still needs some time to be popularized in plastic flexible packaging, Some problems need to be discussed by the flexible packaging industry and the ink manufacturing industry

alcohol soluble inks

in the field of flexible packaging, water-based inks can not completely replace solvent based inks in a short time. Therefore, efforts to develop alcohol soluble inks that are easy to environmental treatment are still the leading direction for the development of environmental friendly inks. It can be predicted that alcohol soluble inks will occupy the main share of China's high-end food and drug flexible packaging printing ink market, and have broad market prospects

alcohol soluble ink is composed of alcohol soluble synthetic resin, solvent and organic pigment. It has good fluidity and printability. It is fast drying, bright and colorful. It is also a volatile dry ink and can be widely used in plastic film printing. At present, the alcohol soluble ink products on the market include alcohol soluble surface printing ink and alcohol soluble internal printing compound ink

general alcohol soluble gravure surface printing inks mainly use polyamide resin or modified polyamide resin as binder. Although these products have good printability, excellent shallow printing effect and good adhesion fastness, they also have many disadvantages, such as poor grease resistance, poor water resistance and high temperature resistance. Why regret buying a low-cost testing machine? Easy to agglomerate under warm condition. In order to solve these problems, Ye's ink uses polyurethane, alcohol soluble nitrocellulose and other high-grade resins to build special pipes and pipe processing projects. It has developed GM and other series of alcohol soluble surface printing inks, which have the advantages of high temperature resistance, water resistance and hydrogen peroxide resistance, and can effectively solve the damage of solvent based inks to human health and the impact of solvent residues on the quality of packaged food, It has been widely used in gravure printing industry

in terms of flexible packaging composite printing, Yeshi's GS alcohol soluble internal printing composite ink is also a product with large consumption. It uses synthetic resin and non-toxic pigments (without heavy metals) that do not contain benzene and ketone solvents. The solvent residue is very low. It is suitable for printing food packaging with strict requirements on solvent residue, such as coffee, chocolate, gum, tea, etc. In order to achieve better composite strength, alcohol soluble composite inks generally need to be used together with alcohol soluble adhesives. Glp-sh series products developed by Yeshi have good composite strength. They can be used effectively in the production of cooking or boiled packaging bags

improvement of environment-friendly inks

although water-based inks and alcohol soluble inks are the main force in the future ink market, there are still many needs, that is, some pages are important for many external connection improvements

as for water-based inks, because the solvent used is mainly water, the volatilization speed is much slower than that of benzene, ketone and alcohol solvents, and the printing performance and quality still fail to meet the standard of solvent based inks. It can be seen from table 1 that the volatilization rate of different solvents varies greatly, affecting many printability of inks. This problem can be improved from many aspects

(1) carry out comprehensive adjustment to improve the performance of water-based resin, cosolvent and auxiliary solvent

(2) rational use of lotion and water-soluble waterborne acrylic resins

(3) adjust the drying system of the printing equipment

(4) when dissolving aqueous acrylic resin and other resins, ammonia should be used. In order to reduce the disadvantages of ammonia smell, some odorless amines can be used to replace ammonia, and it is added to the solution with a pH value of about 8.1 to form ammonia salt without ammonia smell, so as to reduce the smell of ink. The total output value of China's wood plastic industry is expected to challenge the threshold of 60billion yuan

in addition, the adhesion fastness of water-based ink on PE, PP and other plastic films is also a major problem to be solved at present. It is suggested to add other resin polymers to the acrylic lotion, which can greatly improve the adhesion fastness

alcohol soluble ink is more mature than water-based ink. In the future, polyurethane ink system will be the focus. Using polyurethane instead of alcohol soluble nitrocellulose and other advanced resins, the ink can maintain excellent performance in printability, drying speed, frost resistance, water resistance, etc

with the advent of more ink products and the reduction of import tariffs, the competition in China's ink market will become more intense. The requirement of environmental protection will become the main reason for restricting the growth of market share of various products, which puts forward higher environmental protection requirements for ink manufacturers and printers. Environmentally friendly ink will become the main force of the ink industry. From the perspective of market, the development and promotion of water-based ink and alcohol soluble ink by using advanced technology will bring new opportunities and inject new vitality into China's packaging and printing industry

reprinted from: Printing Technology

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