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 : September 2009
70 FLEXO SEPTEMBER 2009 www.flexography.org TECHNOLOGIES & TECHNIQUES • Make sure ink techs use the same substrate when matching the color as has been speciﬁed for the job. • Run your press at the same speed at which your job was signed off; as you increase or decrease press speeds your color may be affected. • Make sure that your shipment of ink for the live press- run are the same inks used in the initial drawdowns. Remember that the same color will look different on various substrate types, and even similar substrates from different manu- facturers. Photo courtesy Flint Group Narrow Web. How to Control Spot Colors During a Run A Step-by-Step Guide By Deanna Whelan Although the basis of this article is "how to control spot colors during a run," there are several factors to con- sider prior to getting on press. When you feel that inks are properly matched to achieve desired results, only then do you prepare your press for the final run. Preparing up-front can save time, money, and materials for greater uptime and bottom line benefits. COLOR MATCHING & PREPRESS PREP Ink technicians should ensure they know the press setup and conditions that are planned for the live pressrun. They should mimic the final press settings in the initial ink matching phase. Subsequently, make sure that the same standard is used in matching the colors as used in the live run; results in the lab should match results on press. For all color matches, be sure to use the specified anilox for the inks and substrate used; in addition, use that same anilox during the live pressrun. Ink color can vary dramatically with different substrates. Make sure ink techs use the same substrate when matching the color as has been specified for the job. Will the final run be laminated or varnished? This can affect color. Knowing this upfront will provide the closest lab match to the end result. When your drawdowns are complete, you must verify color. Three methods of checking color can be used: • Measure color by "eye." To alleviate distraction, mask the colors that surround the one under review with black. • Use a light booth to aid in visual approval. This ensures you are using the customer's specified light source. • Finally, using a spectrophotometer will verify color measurement in the most detailed and scientific manner. This should be done when finalizing the ink standard and when approving ink drawdowns. Bottom line: Before the start of any pressrun, ensure that inks have been matched to achieve desired pressrun end results. Before running the live job, clean the press and be certain it is in solid working condition. Press maintenance is crucial to consistent and problem-free pressruns. BEGINNER FLEXOGRAPHER