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FLEXO Magazine : February 2009
TECHNOLOGIES & TECHNIQUES FIGURE 4. Chromatogram ink solvents used in flexible packaging printing. FIGURE 5. The FID detector. lyzes and reports the names and amounts of the solvents found in printed film samples. The computer file with this information is called a method. The method contains the GC operating parameters (GC tempera- tures, flows, etc.). The method file stores the names of the solvents based on their reten- tion times. It also stores the information that is used to calculate the amount of each solvent found. The GC data system can be set up to print out an automatic report with the name of each retained solvent found in your printed film sample and the amount in mg/ream or mg/square meter. SUMMARY The gas chromatograph is an important test instrument for analyzing residual sol- vents in printed flexible packaging mate- rial. Today's GCs are very reliable and will provide useful production start-up and quality control information. With attention to normal operational checks and routine preventive maintenance, your GC will provide many years of useful, trouble-free service. . ABOUT THE AUTHOR: Burton Todd is the technical director of ChromLab. He has provided expert on-site GC training and support for the analysis of residual solvents in flexible packaging materials and for the analysis of printing ink solvents for more than 25 years. He can be reached by email at email@example.com or by phone at 610-644-2260. Editor's Note: This is the first part in a series of FLEXO articles focusing on gas chromatography applications for flexible packaging printing/converting. - FLEXO FEBRUARY 2009 www.flexography.org
Sustainable Winter 2009