Océ ® DirectPress Technology Get the best results o Guidelines for offset preprinted media Edition December 2011
Introduction Monochrome (toner based) digital printing systems are often used to print information on offset preprinted media. Offset preprinted media will expose the printing systems to offset inks and in many cases drying powders as well.
Recommended offset inks and varnishes Optimal performance can only be achieved when the preprinted media are produced (sheet-fed or web-fed) in accordance with the sound craftsmanship guidelines for offset printing. Thick ink layers, excessive use of drying powders, extremely short drying times and/or improper curing may seriously impact the performance of your digital printing system. For optimal print conditions, please see the ink and varnish manufacturer's instructions.
Coatings A coating is an aqueous dispersion lacquer. Like inks, varnishes and drying powders, dispersion coatings can also seriously impact printing systems using both the traditional electrophotographic printing technologies as well as the unique Océ DirectPress technology. Not all coatings can be used with Océ DirectPress technology. It is important to clean the offset coating station thoroughly, before using the approved coating.
Tips and Tricks General Tips and Tricks for optimal performance of offset preprinted media on digital printing systems. • Avoid using magnetic, conductive, fluorescent or metallic inks. • Test a small batch of preprinted media before ordering large quantities produced under identical conditions. • Try to avoid having large preprinted areas in the direction of the paper path where possible. • Mix preprinted jobs with (preferably large) jobs on non-preprinted paper. • Avoid thick ink layers.
Recommended oxidative offset inks and varnishes - Product codes Epple - ProLaser* Process inks Yellow Magenta Cyan Black 100 985 100 986 100 987 52 745 Van Son - LaserPlus (EU codes) Universal inks Universal Black VS70120 Process inks Yellow Magenta ® Cyan PANTONE basic inks Pantone Yellow Pantone Warm Red Pantone Rubine Red Pantone Rhodamine Red Pantone Purple Pantone Reflex Blue Pantone Process Blue Pantone Green Pantone Mixing White Pantone Yellow012 Pantone Orange021 Pantone Red032 Pantone Blue072
Recommended oxidative offset inks and varnishes - Product codes Toyo - BioPlus High Solid Process inks Yellow Magenta Cyan Black 0010 2380C5 0011 2381C5 0012 2382C5 0013 2383C5 ® PANTONE inks Reflex Blue Opaque White Dense Black Yellow Warm Red Rubine Red Rhodamine Red Purple Violet Blue Green Black Medium White Yellow012 Orange021 Red032 Blue072 0016 2384C5 0018 2385C5 0017 2386C5 0010 2387C5 0015 2388C5 0011 2389C5 0015 2390C5 001A 2391C5 0016 2392C5 0012 2393C5 001H 2394C5 0017 2395C5 0018 2396C5 00
Recommended UV offset inks and varnishes Product codes Zeller + Gmelin - UVALUX 20 series Process inks Yellow 2001 Magenta 2002 Cyan 2003 Black 2004 ® Dense Black Yellow Warm Red Rubine Red Rhodamine Red Purple Violet Reflex Blue Process Blue Green Mixing Black Transparent White Yellow012 Orange021 Red032 Blue072 Yellow Magenta Cyan Black PANTONE inks 2005 2006 2010 2020 2030 2040 2050 2055 2060 2070 2080 2090 2095 20012 20021 20032 20072 Yellow Yellow012 Orange021 Warm Red Red032 Rubine Red Rhodamine
Recommended UV offset inks and varnishes Product codes 9
The ideal properties for oxidative drying offset inks • The oxidative drying offset inks should contain no migratable components (0.0 mass% at 110°C). This means that the ink contains no low melting polyethylene wax. High melting polyethylene wax (T>133°C) and preferably PTFE-wax can be useful and are allowed. Further, the ink contains no mineral oils and no non-reacting-vegetable-oils (esters of (almost) saturated fatty acids (e.g. stearic acid) and alcohols (e.g.
The ideal properties for UV offset inks • The UV offset inks should contain no migratable components (0.0 mass% at 110°C). This means that the ink contains no low melting polyethylene wax. High melting polyethylene wax (T>133°C) and preferably PTFE-wax can be useful and are allowed. • For UV offset inks complete UV curing of all acrylate monomers should take place. This means that the acrylates have to be included in networks that are too big to migrate at 150°C.
The ideal properties for aqueous dispersion coatings • The aqueous dispersion coatings contain no transferable components (0.0 mass% at 110°C). This means that the coating contains no low melting polyethylene wax. High melting polyethylene wax (T>133°C) and preferably PTFE-wax can be useful and are allowed. • For aqueous dispersion coatings complete evaporation of the water and complete oxidative drying should take place.
Paper cutting and dust Loose paper dust on (preprinted) paper causes problems in digital printing systems. Dust is most likely created on the sides of sheets during cut and trim operations (see illustration 1 and 2). It can be composed of both fibre and coating materials that have been fragmented from the edges. Once the (preprinted) paper is processed in a digital printing system the dust can contaminate the system, leading to printed artefacts and contaminated sensors.
Cost structure of preprinted media The price of ink is only a small part of the total costs of preprinted media. The following graph shows that changing to a more expensive offset ink does not have a large influence on the price of the preprinted media. Changing offset inks for an offset printer might also require some additional labour costs.
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