No benzene ink use points

Since the 1980 s, China's plastic flexible packaging industry has been rapid development, promote the food, pharmaceutical and other daily-use chemical products such as the rapid development of packaging industry, people's consciousness of environmental protection, health and safety are also growing. The government in formulating policies, promoting economic development, is also the first to protect the environment and natural resources, reduce pollution and hazards listed in the first priority consideration. As packing industry, how to reduce solvent residual, especially to reduce or eliminate the benzene solvent residual, has received widespread attention. Now, for the majority of users to introduce domestic environmental printing ink printing packaging plant commonly used several kinds of soft packaging different performance and use of the key points, in order to better use the ink. At present, the main environmental printing ink presence of benzene composite ink, water-based gravure ink, UV ink and water-borne UV ink, etc. A, no benzene gravure composite ink solvent traditional flexible packaging composite gravure printing ink generally consists of chlorinated polymers, in the process of printing ink production, printing ink solvent is commonly used in the toluene and esters, ketones and other organic solvents. The role of toluene in ink is: ( 1) Solubility of the resin in the ink; （ 2) Printing eligibility and plate good wettability. Although these organic solvents for the most part after drying can be eliminated, but the remaining part will cause a harm to human body and long-term exposure to skin dryness, roughness, if the infiltration of the skin with blood or blood vessels will endanger people's blood and hematopoietic function, and may even cause chronic poisoning of the body, organic solvent can also react with some gas in the air smell chlorine and smoke, serious air pollution, to all sorts of influence on the growth of plants, and destroy the ecological balance, so the ink factory has been trying to research and development of environment pollution smaller no benzene gravure composite ink to replace toluene printing ink, avoid benzene residues harm to health. At present, no benzene compound ink has the following kinds: 1, no benzene containing ketone polyurethane composite ink. Does not contain benzene solvents, but containing ketone solvents. Characterized by bright colors, solvent release and good printing eligibility. Mainly for the printing PET film, NY film. In the OPP film printing, adhesive fastness is a bit poor, but does not affect the strength of composite. 2, alcohol ester soluble polyurethane composite ink. With low odor, does not contain benzene, ketone solvents. But be especially careful when printing shallow network version of the reproducibility, is mainly used for printing PET film, NY film. In the OPP film printing, adhesive fastness is a bit poor, but does not affect the strength of composite. 3, alcohol compound ink, water-based acrylic system main solvent is given priority to with ethanol, can add 10% of the water as diluent, cheaper prices. The ink factory produces the white ink is given priority to, can with ordinary benzene soluble chlorinated polypropylene composite ink use collocation, color is in front of the use of ordinary composite ink printing by bright colors, with alcohol finally white water-based ink, it could reduce the benzene solvent residue. 4, alcohol compound ink, water-based polyurethane system main diluted with 95% ethanol as solvent, the ink does not contain benzene, ketone solvents, low odor, colourful, low price, printing eligibility good characteristics. Can printing PET film, NY film, OPP film. The product has been successfully launched in zhuhai yue tong company, series of Numbers for GP39 alcohol soluble compound ink. No benzene compound composite inks, ink and contain benzene is composed of links, colorants, solvents and a small amount of additives, generally do not use a single solvent ink, but with several solvents, to improve the dissolution performance and drying performance. No benzene, the quality control of compound ink indicators mainly include: hue, fineness, tinting strength, gloss, viscosity, dry, attach themselves fastness, heat resistance and freeze resistance, etc. These indicators of plastic packaging and printing is very important. Second, water-based ink, water-based ink in water as the main solvent, with a small amount of alcohol as a cosolvent ink. Water-based inks and solvent-based inks biggest difference is that a water-based ink solvent is used in water and ethanol, VOC content is extremely low, small pollution to the environment. Ink performance advantages: 1, the ink has the advantage of environmental and safety. Many ink can be designed into low VOCs or zero VOCs. 2, ink painting has the advantages of stability, and low flammability ink for water low volatility make it have better viscosity stability. 3, a new generation of water-based products than solvent system is easy to clean, use soap and water or weak alkaline solution of the printing machine parts can be completed the cleaning work, so as to improve the production efficiency. Water-based ink compared with solvent ink, water-based ink liquidity is good, easy to prepare high pigment ink, so the strength of the color is generally 30% ~ 50% higher than the solvent base ink and still have good liquidity. Due to the water's surface tension is bigger, ink wetting, non-volatile, water printing speed couldn't get on. If you want to obtain solvent ink printing speed and printing quality, not only water-based ink itself needs to be improved, and intaglio printing equipment and print roll also needs to be improved. For example: the corrosion or electric engraving laser plate-making roller roller instead, print roll also require the use of corrosion resistant material to manufacture. Also need to change his costume or dress on printing machine is more powerful and effective ink drying system and ink scraper device components, this requires considerable investment and long time. So water-based gravure ink removing in paper printing, also can't replace solvent ink.