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FLEXO Magazine : January 2010
32 FLEXO JANUARY 2010 www.flexography.org BUDGETS MOVING TO PACKAGING According to Reiner, current developments open up good prospects for packaging. Whereas sales of advertising agen- cies are declining, agencies specializing in the field of pack- aging are recording increasing turnover. He explained that many budgets from the sector of traditional TV advertising are moving to packaging equipment, to more easily realize integrated communication systems. Classical agencies are primarily concentrating on optical awareness. In contrast, good packaging designers, by the choice of material and creative processes, are also able to reach the other human senses such as touch, smell, taste and hearing. COMPLEX SUBJECT OF MIGRATION Safety and security are paramount to consumers. As such, they always react to cases of chemical migration. Dr. Heinz Schweiger, Zeller+Gmelin, explained to attendees which legal guidelines and regulations are relevant to food packag- ing, and which responsibilities result from this for the individual. During his lecture, he highlighted the most important rules, such as the regulation (EG) no. 1935/2004, the so-called framework regula- tion, as well as the plastic direc- tive 2002/72/EU and the respective additions issued 2007/19/EU. In this connection he also explained the levels contained in the plastic directive like SML (Specific Mi- gration Limit) and OML (Overall Migration Limit) with their cor- responding limit values. More- over, the GMP-directive 2023/2006/ EG, which defines rules for good manufacturing practice (GMP) for all materials and articles that come into contact with food is also relevant. Schweiger insisted that, in order to adequately meet the complex demands required by law, it is indispensable that everybody involved in the process chain---from raw mate- rial supplier and providers of foils, paper and printing inks, to the printers and packers---assume responsibility for their particular field. He noted further need for action regarding the difficult subject of chemical analysis. Problems continue to arise from disharmonious test methods within the industry. Moreover, some methods are unsuitable for certain packaging types. Migration tests, which are carried out at 70°C, for example, are unsuitable for polystyrene cups, which are subject to structural deformation at such temperatures. NEW INK GENERATION Hans-Ulrich Lindner, Zeller+Gmelin, reported on a practi- cal test that analyzed differences in quality with common glossy coatings for polystyrene cups. For this, polystyrene cups both with and without a glossy coating, as well polypro- pylene cups were printed with a standard UV ink and with a new ink type. Lindner explained the content of the test and the criteria against which the printed samples have been evalu- ated. In his summary, he mentioned that, for instance, the dot gain with a raster of 5 percent at 40l/cm was higher with co- rona pretreatment than without. The screen dots with corona tend to be flatter and thinner, as well as a bit frayed. The new ink showed improved values of adhesion and resistance to ethanol in comparison to the standard ink. With the migration analysis, results of all cup samples were below the detection limit of 10mg/kg. A LOOK AT SLEEVES Even though direct printing, as with all previous events, was the focus of the subjects that were discussed, some speakers used the opportunity to peer over the rim of the proverbial tea- cup to give an idea of alternative possibilities of decoration. In one such lecture, John Fehrenbacher from Zeller+Gmelin presented the subject of product decoration by means of shrink sleeves. Within the marketshare of the various label technologies, shrink sleeves rank in third place behind self-adhesive labels (46.3 percent) and wet glue labels (35.8 percent) with 14.4 percent. He compared the pros and cons of the most important shrink materials: PVC, PET and OPS. Gravure printing is mainly used for the production of shrink sleeves (marketshare 70 percent). One quarter of the prod- ucts are printed flexographically, primarily with solvent-based inks. In this sector, the share of UV flexo printing is continually increasing, and has now reached around 10 percent of total sleeve production. The remaining 5 percent is comprised of offset and digital work. Common printing speed is approxi- mately 250m/min. NEW OPTIONS: IML A further option for container decoration is in-mould label- ing (IML). Claus Weinert, Illig Maschinenbau GmbH, informed attendees about a new system of thermoforming for IML tech- nology. He presented the different decoration possibilities for round and square products, and went into customer benefits of the new thermoforming system. The mentioned advantages varied from a higher print quality and the simple changing of design during running production and a possible application In parallel with the lectures, a trade exhibition took place with around 15 com- panies from the industry presenting their respective novelties. Dr. Heinz Schweiger from Zeller+Gmelin guided through the complex range of topics regarding migration with legal regulations and responsibilities of packaging producers. INDUSTRY INDICATORS
Sustainable EOY 2009