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 : July 2007
hot technologies 2 2 F L E X o J U LY 2 0 0 7 w w w . f l e x o g r a p h y . o r g By comparing a variety of the above parameters with the dif- ferent anilox rolls, we were able to balance them and achieve the optimal configurations. By choosing the optimum combination of opacity and laydown we were able to achieve the following contrast ratios: • UV screen: 83:85 • Std. UV flexo white, Anilox 250 line 12 BCM: 72:76 • Water-based flexo white, Anilox - 250 line 12 BCM: 65:70 • New UV Flexo White, 85 line 18 BCM: 81:83 Based on the tests it was clear that there are three dominant factors for success in replacing UV screen with UV flexo: 1. Ink formulation. 2. The choice of anilox roller. 3. Choice of mounting tape, depending on text versus solids. Combining the right ink, anilox and mounting tape were the most important; plates were all designed for UV flexo and did not influence the results enough to make a notable difference. Ideally, Ideally, our testing would have determined the combination that would give perfect results. Since these tests were completed, feedback from converters using the new UV flexo white technology, in- dicate that the factors mentioned above (and others) do need to be tested and optimized for the specific job and the specific cus- tomer application. ConClusion To achieve optimal performance for no-label look applications, where UV rotary screen is now the print process of choice, we recommend speaking to your ink manufacturer about choos- ing the right combination of parameters for your application. Converters’ results of these tests are impressive and unique in the industry. It is now possible for printers to create an opaque white print using UV flexo white that simulates screen white, achieving an acceptable result at a significantly lower cost. ? ABOUT THE AUTHOR: After attending Dunwoody Institute, Mike Buystedt accepted a position at Louis O. Werneke Co. in Minneapolis, MN as a technical formulator. During his 29-year career in the printing ink industry, Buystedt worked in several areas from formulator, to technical management, to operations management. After the acquisition of Werneke Ink by Akzo Nobel Inks, Buystedt held the positions of technical director, market development manager, and is currently the general manager of XSYS’ Midwest region. In addition, he manages XSYS Supplies—the sup- plies division within XSYS Print Solutions. Buystedt has been involved in many trade associations, including FTA, EMA (Envelope Manufacturers Association), PIM (Printing Industries of Minnesota), ICMA (International Card Manufacturers Association), FPA (Flexible Packaging Association), and GAA (Gravure Association of America). He is a past board member of TLMI (Tag and Label Manufacturers Institute), past TLMI technical chair and is currently the U.S. rep to the World Label Association. Mike has also spoken at several FFTA Forums and events. ?Figure 4.+#3; Screen ink deposit is determined by the number of lines per inch in the mesh, the thickness of the ink layer, and the percentage open area. Photo courtesy Stork Prints America. ?Figure 5.+#3; A past drawback to using screen white in combina- tion with UV flexo ink was the need to modify the UV flexo ink with silicone to wet out over the screen white. Photo
Golden Anniversary Commemorative Journal