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Screen PrintingĪvoid excessive heat (maximum 104F) which may accumulate in printed stacks. For best results, test adhesion of ink systems. Large amounts of DOP plasticizer in gravure inks may interfere with proper ink adhesion. The viscosity can generally be used as supplied by the manufacturer and adjustments should be made according to the manufacturer’s recommendations. Inks must be made from fully dried materials. Gravure inks on holographic metalized paper may be solvent, UV cured or water base in formulation. Sheet damping must be even across the sheet especially avoiding excess water at the edge of the sheets.All additives should be used according to the manufacturer's recommendation. Additives may be used in the damping solutions to aid the drying process.Processes with low print take-off may require the addition of up to 12% isopropanol to reduce the surface tension and minimize the amount of water delivered to the paper surface.Fount solutions should not be too acidic (ph 5.5) and should be used sparingly as excess use will inhibit the drying process.Where possible, plain water should be run in the fount.Small 11 inch x 17 inch offset presses could be a concern because of less control with the fountain solution rollers. When printing web offset, excessive heat (104F maximum) can adversely affect the quality of the hologram also certain press controls may give erroneous reading when reflected onto the holographic material. This is possible because of metalized paper's absorption qualities. Wet-trapping: Ink can be wet trapped on metalized paper for multiple color printing.Using special blanket hardener at start-up will prevent sticking and reduce picking. Blanket: Conventional low tack quick release type.For each of the succeeding stations the tack should be lowered one point. In multi-station presses, the first station ink should have tack of 14.
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Fountain solution: 15 % minimum recommended alcohol content, 25% maximum.Offset Printing Offset Ink systems perform best when these guidelines are followed: Generally, no additional special procedures are required for flexo printing 3. Low ink coat weights are recommended to facilitate the drying process 2. Additional driers in the ink are recommended where tolerable to ensure hard drying.į. On multi-station presses, the first station should have a tack of 14 with each successive station delivering inks with successively lower tack levels.Į. Ink tacks should be 16 or less using an inkometer tack tester. The use of mineral oil, paste and gel reducer should be avoided.ĭ. Viscosity can generally be used as supplied by the ink manufacturer and adjustments should be made according to the manufacturer's recommendations.Ĭ. Inks must be made from fully oxidizable materials.ī. Conventional inks dry by oxidation more than absorption. Inter-station UV curing is the most successful way of printing holographic paper and board.Īdditional tips for conventional inks on metalized or film surface:Ī. Potential problems associated with offsetting and drying are avoided by using UV-cured inks. The final overprint coating should be selected for clarity to minimize any impact on the holographic brightness.Īlthough conventional inks work well, UV-cured inks are ideal. Either aqueous or UV-cured over-coatings are recommended. When printing on COATED backsides, metallic surfaces or film, inks dry by oxidation.Ī final clear coating on the holographic side is recommended to cap printed materials and prevent offsetting. When printing on UNCOATED both sides, inks dry by absorption. Formulations are readily available which are specifically designed for metalized papers or laminated film. Your best resource for selecting printing inks is the ink supplier. Using both ink types can create a vivid, three-dimensional appearance. For a solid appearance, opaque inks are recommended. For example, to achieve a shiny, glossy shade, transparent inks should be used.
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The graphic design determines number of ink layers and opacity. Printers should consult with their ink supplier and press manufacturer for final printing recommendations. We offer these general printing tips and frequently ask questions to highlight key areas. Both products have special coatings to enhance printability. NovaVision stocks direct metalized material and material which is laminated with holographic film. Certified Cargo Screening Facility (CCSF)