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FLEXO Magazine : October 2011
UniFlexGTT for Wide Web | UniFliGTT for Narrow Web | UniCorrGTT for Corrugated | UniCoatGTT for Coatings/Offset Hello, GTT When the world’s largest anilox manufacturer rewrites the flexo rulebook with an invention that renders obsolete conventional hexcell anilox technology, you know it’s got to be a pretty big deal. Meet UniFlexGTT for wide web and UniFliGTT for narrow web — the future of flexographic ink metering technology. Imagine requiring just two or three GTT surfaces to replace your entire stockpile of hexcell anilox rolls/sleeves. Imagine: use the same surface for fine screens and stronger solids — on fewer ink stations at higher speeds. Go ahead and streamline your pressroom. Gain unparalleled print quality and consistency. Free your bottom line to soar. And re-imagine your future. Is this an evolution in flexo? More like a revolution. Bold words? You bet. And here’s why: Apex reinvented the very concept of ink-to-plate transfer and, from the ground up, perfected a whole new Slalom Ink Channel surface geometry, a new hybrid ceramic composition and a new laser engraving process. So save time. Save ink. And save money. Let us prove it: download your own GTT brochure online. Or better yet, ask for your GTT quote today. ® Bye bye, anilox. Adios, unwieldy anilox inventories. Sayonara, BCM/LPI math. Bon voyage, sleeve and roll changes. So long, pinholes, dot gain, mottling and haloing. See ya later, downtime. Rest in peace. WhyiseveryonetalkingaboutGTT?Discoverwhatyourcompetitorsarealreadylearning:GTTisarevolutioninquality,standardizationandcostsavings.byebyeanIlox.Com call 866-APEX-USA info@ apexnorthamerica.com www.byebyeanilox.com GTT Print Ads 8x10.875.indd 1 9/2/11 3:07:10 PM Ink & Solvent oxIdatIon The Clean Air Act requires certain printers to reduce volatile organic carbon (VOC) emissions which result from the use of solvent inks, coatings, adhesives and cleaners. To do this, VOC emis- sions are often combusted in an oxidizer. Oxidizers are typically fueled with natural gas which must be included in Scope 1 of a carbon footprint. However, the combus- tion of the VOCs is often overlooked as another source of CO2. VOC combustion is generally expressed as follows: Depending on the type of VOC being used, such as n-propyl alcohol or n-propyl acetate, the amount of CO2 being gener- ated per molecule of VOC would vary. For example, a molecule of n-propyl alcohol is expressed as C3H8O. The oxidation reaction would be 2C3H8O + 9O2 6CO2 + 8H2O So, for every two molecules of n-propyl alcohol, six molecules of CO2 are emitted. It would be extremely difficult to calcu- late exactly how much CO2 is emitted by the combustion of each ink and solvent blend used in a flexographic print shop. Emission factors were calculated for five commonly used VOCs, as well as an 80/20 blend of n-propyl alcohol and n-propyl ac- etate, which might be present in a facility to determine an appropriate range or aver- age conversion. These assumptions and calculations result in conversion factors averaging 2.1 , with a range of 2.0 -2 .2 . table 5. Conversion factors to determine the amount of CO2 being emitted from the combustion of VOCs (by weight). VOC Emission Conversion Factor (by weight) n-propyl alcohol 2.197 n-propyl acetate 2.155 isopropanol 2.197 ethanol 1.997 ethyl acetate 1.998 Average 2.1 Range 2.0-2.2 80% n-propyl alcohol 20% n-propyl acetate 2.184 Usage (VOC Combusted in US tons) x 2.1 average emission factor x 0.907 metric tons/US ton = CO2 Emissions (metric tons) Example: A facility oxidizes 10 tons of VOCs. Using an average conversion factor of 2.1 , it would create approxi- mately 21 tons of CO2. To convert US tons to metric tons, the number is multi- plied by 0.907 metric tons/US ton which equals 19.05 metric tons of CO2. 10 US tons of VOC x 2.1 x 0.907 metric tons /US ton = 19.05 metric tons of CO2 A solvent-based facility should know the amount of VOCs passing through the facility and, if it is required by regu- lation to have an oxidizer, its control effi- ciency (capture efficiency x destruction efficiency). VOCs that are not oxidized are emitted into the atmosphere. The nature and ultimate fate of those VOCs would be difficult, if not impossible, to determine. Therefore, with current knowledge, the un-oxidized VOCs can- not be included in any reasonably ac- curate calculation of a facility ’s carbon footprint, but should be noted elsewhere for future reference. In summary, Scope 1 emissions take in a wide range of sources of direct GHG emissions in a facility. Combustion sources (stationary and mobile) and refrigerants are the primary components. A compre- hensive look at all possible direct emission sources must be made. Methodology for calculations must be documented to be consistent with future measurements. n Editor’s Note: These articles are being developed as a joint effort of the FTA Sustainability Committee. For more information, contact Doreen Montele- one, FTA director of EHS, membership & special projects at dmonteleone@ flexography.org. The next installment will include a discussion of Scope 3 emissions and wrap-up of the current state of carbon footprinting. Scope 3 emissions include indirect, optional GHG emissions from sources such a,s employee travel, commuting and trans- port of materials. Over 40 years of experience in the flexographic industry, design and production of the highest quality systems. innovation is the key to our success. COMPUTER CONTROLLED VISCOSITY CONTROL SYSTEM IN THE ROUND SLEEVEMAKING SYSTEMS IN THE ROUND SLEEVEMAKING Head Office AV Flexologic B.V. H. K . Onnesweg 2 P.O. Box 252 NL-2400 AG Alphen aan den Rijn The Netherlands Tel +31 (0)172 434221 Fax +31 (0)172 437919 Mail email@example.com Toll Free number from the UK 0800-3892121 (only accessible in the UK) PHOTOPOLYMER PLATEMAKING EQUIPMENT FULLY AUTOMATIC MOUNTING MACHINE for flexo printing plates (for the flexible packaging and corrugated industry) Advanced MOUNTING & PROOFING EQUIPMENT (for the flexible packaging, corrugated and label industry) www.flexologic.nl PRE-PRESS EQUIPMENT FROM MODEST SYSTEMS TO THE MOST ADVANCED HIGH-TECH SOLUTIONS 94 FLEXO OCtOber 2011 www.flexography.org