With the improvement of people's living standards and health, the pursuit of low toxicity, environmental protection, and healthy products, our ink market has undergone certain changes, and the water-based market is gradually improving. At present, water-based inks are mainly flexible and intaglio printing, most of which are food packaging, tobacco and alcohol, pharmaceutical factories, and children's toys. About 95% of flexible printing and gravure printing in the United States and Europe are water-based, while China currently accounts for only 3%.
Water-based inks were born under this background. In the printing field, in order to eliminate the VOC (low boiling point organic compounds) released by solvent-based inks, that is, to meet the requirements of EPA to reduce or eliminate VOCs, chemical engineers have continuously developed high solids. Divided into coatings, powder coatings, UV-curable coatings, water-based coatings, etc., these inks have greatly reduced VOC emissions, and some even eliminated VOC emissions.
Composition of water-based ink
Water-based inks are made from water-based resins, pigments, solvents and additives through compound processing and grinding. The water-soluble resin mainly acts as a binder in the ink, and the pigment particles are evenly dispersed, so that the ink has a certain fluidity, and the adhesion to the substrate material is generated, so that the ink forms a uniform film layer after printing.
Characteristics of water-based ink
1. The water-based ink is a new type of environmentally friendly printing ink with good adhesion, good flexibility, good elasticity, anti-sticking, washing resistance, printability, and over-netting properties, and high solid content.
2. Non-flammable, stable ink, non-corrosive to printing substrate, prevent color migration, strong water resistance, and fast drying. Not only can it reduce the hidden dangers caused by static electricity and flammable solvents, but also reduce the residual toxicity on the printing surface, and it is very convenient to clean the printing equipment, so it is especially used in food, beverage, pharmaceutical and other packaging industries.
3. The water-based ink solvent is water and a small amount of alcohol, which significantly reduces VOC emissions, prevents air pollution, and does not affect human health. Products that come into direct contact with the human body, such as T-shirts and other pure cotton, elastic fabrics, The insole printing industry also has a wide range of uses, is a world-recognized environmentally friendly material, and is currently the ink recognized by the American Food Association among all printing inks.
4. In terms of cost, due to the current rising prices of organic solvents, the use cost of solvent-based inks is increasing day by day, and the solvent and water-screen printing of water-based inks mainly use tap water, and the use cost will undoubtedly be much lower than solvent-based inks.
Instructions for water-based ink
Applicable mesh: 40-100T (water-based screen printing plate)
Applicable rubber squeegee: It is recommended to use 65-70 degree polyester squeegee or water-based special rubber
Coating area: 25-35 square meters / kg (77T polyester flat silk or photoresist screen)
Thinner: neutral water
Plate washing water: ordinary tap water
Requirements for water-based ink formulation
According to different printing requirements, the viscosity of the ink needs to be adjusted properly before use. Pay attention to the neutrality of the water added during adjustment, otherwise it will affect the viscosity and drying speed of the water-based ink. At the same time, the amount of thinner (water) added should not exceed 3%, otherwise, or reduce the color density of the ink, it will also have a significant impact on the PH value of the water-based ink.
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