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FLEXO Magazine : February 2011
HD FLEXO www.esko.com email@example.com Visit us at: LabelExpo Americas 2010 14-16 September - Chicago Stand: 5202 The new quality benchmark in flexo printing HD Flexo combines high resolution imaging with advanced screening. The result is a digital flexo plate for superb printingquality and stability. Finally, flexo is able to match offset printing. Benefits at a glance... • Outstanding tonal range, detail & contrast • Smooth vignettes & gradients - print to zero • Reduction of image correction & retouching • Simplified conversion from Offset & Gravure HD Flexo is one of EskoArtwork’s many new technological innovations. Discover today how EskoArtwork can boost your flexo print quality. HD-Flexo A4- Americas.indd 1 7/16/2010 11:49:42 AM Technologies & Techniques peaks or rounded edges at the top, but have level plateaus. They can only be created when the potential effect of oxygen has been excluded from the exposure process. Exactly that is easily achieved in digital UV LED exposure because of the high performance of these systems. It is much easier than with the previous film-based processes, and even easier than with processes that require an additional lamination process stage. Flat tops are mostly used for printing on paper substrates, such as corrugated cardboard printing. To summarize, the digital inline UV technology gives the user a choice—shortened process times or the optimization of screening dots. Cost effectiveness of the new technology is particularly pronounced with the extended service life of the diodes and the exceptional evenness of the inline UV exposure from 5,000 and 10,000 hours. Justifying the initial investment of an Inline LED UV system is an additional expense— particularly when one considers that a conventional light frame already exists on site. However, on-site experience dem- onstrates that the savings generated by fewer plate returns and plate re-runs offset the additional purchase costs very quickly. In addition, no longer is there a risk of damage to the plate en route from the imager to the light frame. And in a time of rising energy prices, it’s important to remember that energy savings for UV LED exposure are typically 50 percent per year, on average. Furthermore, diodes work using a start/ stop process. This means that they do not require pre-heating or an energy- wasting standby mode. Within one shift, the UV LED systems are not switched on continuously-–unlike the tubes in a tube light frame. The actual ‘service life con- sumption’ of power to a UV LED system is considerably less than the shift time, and is therefore much better than with older light frame technology. Time & QualiTy BenefiTs One of the key advantages of digital UV technology lies in the variable, adjustable UV output. In many straightforward cir- cumstances, this can be used to generate shorter UV exposure times. Tests have shown that the exposure time per plate can be reduced from six or eight minutes, to as few as three minutes using inline UV exposure. This is possible because the UV output of LEDs can be increased, so that the amount of energy to the plate remains the same—even with shorter exposure times. Along with the time saved by elimi- nating the need to carry plates to the light frame, this results in a time saving of up to six minutes per exposed plate. In print jobs with multiple colors, the pass-through time for a complete print job can be re- duced considerably–by half an hour with a four-color job. To improve the tonal ranges, the emis- sion strength—and thus, the energy to the surface—can be varied with the use of UV LEDs. Smaller inline dots can be printed than those from a light frame. Minimum printable dots are smaller when using inline uV than with tube exposure. The image illustrates the shift in the tone curve in the highlights on a sleeve. success story--a graphical representation of the rapidly increasing volume of purchases of inline uV technology. 44 FLeXO February 2011 www.flexography.org FLX_Feb11_mech.indd 44 2/16/11 8:51 AM
Sustainable Winter 2011