by clicking the arrows at the side of the page, or by using the toolbar.
by clicking anywhere on the page.
by dragging the page around when zoomed in.
by clicking anywhere on the page when zoomed in.
web sites or send emails by clicking on hyperlinks.
Email this page to a friend
Search this issue
Index - jump to page or section
Archive - view past issues
FLEXO Magazine : June2010
Technologies & Techniques www.flexography.org june 2010 FLeXO 51 The stain test values discussed earlier (area to clear with the tape, 100 percent ablated patch and 50 percent ablated patch) are included in the strip. The next is a HiFi wedge, which has a series of tonal patches in increments of one gray level. This test can be used in both the imaging stage, as well as the finished plate stage. After imaging, the laser’s ability to hold the finest gray level can be verified. After processing, we can utilize the HiFi wedge to verify that we are holding the expected gray level patch as a finished printable dot. The Microline blocks (with the numbers one, two and three above) are a series of very fine parallel lines. The lines creat- ing the numbers are perpendicular to the surrounding image area. If the imager is powered correctly, the lines in both orientations will be virtually the same in weight. When this occurs, the numbers fade into the surrounding background, displaying that the correct ablation energy is being applied. Finally, there are a set of directional markers that can be used to track orientation in the various phases of the workflow. By understanding, measuring and controlling the various stages in the plate making workflow, many forms of dirty print- ing in the highlights can be minimized or eliminated. n ABOUT THE AUTHOR: Wayde Clark is senior technical specialist with DuPont Packaging Graphics. Clark graduated from Buffalo State University with a Bachelor of Fine Arts in 1986, and a concentration in Graphic Design and production. He has held positions as a design artist, mechanical layout artist, art director and VP of operations for a small tradeshop in North Carolina. He joined DuPont in 2000 and has had assignments with the Print Media Group, Cyrel® and Color Proofing Sales and Marketing, and as Technical Support Manager. Wayde is currently responsible for providing tech- nical support and training to our Cyrel® customers in North America, Central America and South America. The focus search test determinations the optimal distance between laser optics and digital plate surface. FLX_June2010_mech.indd 51 6/10/10 9:39 AM