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Characteristics of water-based ink
Water-based ink used in corrugated printing, has been abroad for a long time, in China has also been 20 years. Corrugated printing is developed from printing (embossing), offset printing (flat printing), rubber plate water washable printing, to today's flexible water-based ink printing. Flexible gravure water-based ink from rosin - maleic acid modified resin series (low grade) to acrylic resin series (high grade). Printing plate also from rubber plate to resin plate transition. Printing presses have also evolved from monochrome or two-color machines for large rollers to three-color or four-color FLEXO machines.
Water - based ink composition and characteristics of the same as general printing ink composition, water - based ink is usually colorants, binders, additives and other components. The colouring agent is a colouring matter for water-based ink, giving the ink a specific color. In flexo printing, pigment with good chemical stability and high colouring power is usually chosen to make the mark colorful. The binders consist of water, resins, amine compounds and other organic solvents. Resin is the most important thing in water-based ink composition, usually using water-soluble acrylic resin, connecting material composition directly affect the ink adhesion function, drying speed, anti-sticking performance such as dirty, but also affect the ink ink gloss and preach, amine compounds mainly maintain water-based ink, alkaline PH value, provide better printing effect, make the acrylic resin water or other organic solvent are mainly soluble resin, adjust the ink viscosity and drying rate; Auxiliaries mainly include: defoaming agent, blocking agent, stabilizer, diluent and so on. As water-based ink is a soap composition, air bubbles are easily produced when used. Therefore, silicone oil should be added as a defoaming agent to inhibit and eliminate air bubbles and improve the transfer performance of ink. Blockers are used to inhibit the drying speed of water-based ink, prevent ink on roller dry, reduce paste version. Stabilizer can adjust the ink PH value, also can be diluent to reduce the ink viscosity. Diluent is used to reduce the color of fresh water ink, but also as a light agent to improve the brightness of water-based ink. In addition, water - based ink to add some wax to increase its wear.
Water-based ink for corrugated printing