What are the composition and characteristics of flexographic ink?
1.composition
Flexographic ink mainly consists of linings (resin), solvents, colorants (pigments or dyes), auxiliaries. Connection material with acrylic class of water-based ink, polyamide, polyester, three kinds of most used and the most widely used is acrylic polymer resin, use the connection of water-based ink gloss, weatherability, heat resistance, water resistance, chemical resistance and resistance to polluting has significant advantages, in direct dissolve or synthetic polymer emulsion dispersion, also it can show the good performance. Is the main water on water-based ink solvents, at the same time, contains a small amount of alcohol solvent, the solvent can enhance the ability of soluble resin, auxiliary water improve pigment dispersion performance, and accelerate penetration, suppress foaming. Water-based ink stains are mainly pigments, including inorganic pigments and organic pigments, because most of the water-based ink resin for alkali soluble, so when choosing paint, must use ability of the alkaline pigment. Is a wide variety of water-based ink additives, depending on the requirement of printing ink and the printing requirements of substrates materials appropriate to join, commonly used water-based ink additives have defoaming agent, stabilizing agent, dispersing agent, preservative, flow ping agent, lubricating agent and crosslinking agent, etc.
2. the characteristics of
(1) environmental protection
Flexible version of the water-based ink with water or a small amount of alcohol solvent, reduced emissions of organic volatile, reduce air pollution and improve the working environment, printing is advantageous to the health of operators and some toxic and harmful substances can complete elimination of solvent-based inks and the harm of human body pollution of packaged goods, in addition, due to electrostatic and flammable solvents can be reduced by fire danger and hidden trouble, reduce the print surface residual solvent odor, therefore, the flexible version of the water-based ink with non-toxic, non-flammable, does not pollute the environment and other characteristics, known as the green printing.
(2) quick drying
Generally speaking, flexographic ink drying method has volatilization, osmosis, curing reaction or 3 people and some drying film mode, drying speed is a flexible version of waterborne ink remarkable characteristics.