Ink In Flexo Printing
The inks are specially formulated for flexographic relief plates and anilox rollers, ensuring precise transfer of the ink onto a variety of substrates such as plastic films, paper, cardboard and metal foils.
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Product Introduction
Flexo inks typically consist of:
Pigments/Dyes: Provide color and opacity. Pigment-based inks are more stable and durable, while dyes offer vibrant hues but lower lightfastness.
Resins: Bind pigments to substrates and determine properties like adhesion, flexibility, and chemical resistance. Examples include polyamides, acrylics, and nitrocellulose.
Solvents: Regulate viscosity and drying speed. Water and alcohols are common in water-based inks, while esters and hydrocarbons are used in solvent-based formulations.
Additives: Enhance performance, such as plasticizers for flexibility, antioxidants for shelf life, and surfactants for substrate wetting.
FAQ:
How do the viscosity and drying speed of ink affect the quality of flexographic printing?
Viscosity directly affects the transfer efficiency of ink on the anilox roller. For example, solvent-based inks usually need to control the viscosity at around 35 mPa・s to ensure uniform ink transfer; the drying speed needs to match the speed of the printing press: too slow speed will cause smearing, too fast speed may cause blockage or decreased adhesion.
UV/LED curing inks can maintain clear patterns during high-speed printing due to their instant drying characteristics, and are particularly suitable for high-resolution requirements for films and labels.
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