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FLEXO Magazine : June 2013
Substrates should be free of dirt and dust as much as pos- sible and should be applied as the first down with inks and other materials applied as a second down. The oxygen transmission rates of typical flexible packaging materials can be drastically improved by printed oxygen bar- rier coatings and provide a viable alternative to existing film options. Figure 6 provides gas barrier performance across multiple substrates on polyester, oriented polypropylene and OPA at room temperature and relative humidity. Nano- composite coatings provide excellent barrier performance on both PET and OPP with dry film weights as low as .2 g/m2 (dry). Gas barrier coatings also provide improvements in flex- ibility and lamination integrity. Values of oxygen barrier coatings include: excellent oxygen and aroma barrier, the replacement of PVdC and EVOH coat- ings, improved flex crack resistance of oxide/metallized films, and extended shelf life. Application of high oxygen barrier coatings can take place: • At conventional film weights, depending on the structure and barrier required • On existing equipment • Through the removal of barrier film and adhesive in three-ply and more laminates • As a reduction in processing waste • As a reduction in energy • By allowing duplex laminates to compete with triplex n About the Author: Bob O’Boyle is product manage, coatings at Sun Chemical. O’Boyle has been in the industry for 35 years and has been instrumental in developing and advanc- ing nanoparticle technology. Sun Chemical offers unique High Oxygen Barrier Coatings – SunBar – which focus on eliminating a laminated structure. This article is based on his presentation at FTA’s 2013 Annual Forum. O’Boyle can be reached at firstname.lastname@example.org or by phone at 973-404-6288. Figure 6: Gas barrier performance across multiple substrates on polyester, oriented polypropylene and OPA at room temperature and relative humidity. www.flexography.org June 2013 FLEXO 105