Sign & Digital Graphics

August '18

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S I G N & D I G I T A L G R A P H I C S • August 2018 • 37 and the model type. For example, on Mimaki's UV-curing JFX200 and JFX500 Series printers, the machines will inform the end user when the degassing mod- ule should be replaced (approximately once a year). Also, units that have white inks in them (both eco-solvent and UV products) will also automatically provide a periodic request (once a year) on the printer's display asking that the operator change the filters in the ink-recirculation system." Another example of a periodic main- tenance is if the user is using white and/ or silver inks in an eco-solvent type prod- uct like Mimaki's CJV/JV 300. If these inks are used, then the printer will rec- ognize this and prompt the end user to do a daily whit/silver ink maintenance— remove the ink cartridge and shake it a bit in order to make sure that the pig- ment is mixed well." UV Units Require More Cleanings Molina reports UV-cure printers tend to require more frequent cleanings and maintenance than eco-solvent models and other printer types, due to the gen- eral chemistry of UV inks and the curing process. He says when using UV printers, it's especially important to be aware of the specific type of material you're printing on and any special requirements for that particular substrate. "Also ensure that the material is loaded properly before print- ing. Roland's Versa UV flatbeds allow you to raise and lower the printhead height for ideal print quality. This also helps prevent over-spraying or misting, which can negatively affect imaging and, over time, cause damage to the printheads." He adds that as far as textile printers are concerned, the cleaning and mainte- nance are very similar to the requirements for eco-solvent inkjets. "Textile printing, however, often involves longer runs, so cleaning between jobs can be even more crucial. As textile printers use water-based inks, be sure to use water-based cleaning fluid (instead of the solvent-based fluids recommended for eco-solvent printers) when performing your regular cleanings," he concludes. SDG Many Mutoh UV, dye sub and eco-solvent machines require the same cleaning techniques, but will require different cleaning solutions. (Images courtesy of Mutoh America) The printer's cap tops and wipers must also be cleaned. (Image courtesy of Regional Supply) A printer tech clean- ing the rails that the print car- riage rides on. (Images courtesy of Regional Supply)

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