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FLEXO Magazine : July 2014
Job specifications have a huge impact on profitability and customers today demand more than ever. In order to stay ahead, you need an edge with the fastest changeovers, a streamlined workflow and a comprehensive approach to building business. A complete solution that's future proof. The Undeniably Powerful Performance Series. ADVANCED PRODUCTIVITY To see how this award-winning technology can revolutionize your workflow -- visit markandy.com/performance Material Selection e key to the manufacture of high quality, safe packaging for food and other sensitive products lies in good communication among stakeholders across the entire packaging supply chain. is will better ensure that nal packaging complies with relevant regulations and guidelines, and ultimately, ensures consumer safety. Stakeholders should be clear about all elements of speci cation and traceability, as well as what is to be packed and how (i.e., hot lling). Final consumer use of the product and packaging should also be fully understood. Questions to ask include: • Is the packaging intended for food or other sensitive products? • Is the package component destined to be used as primary pack- aging, where the packaged goods are in prolonged direct contact with the non printed side of the packaging? • Is the component designed as a primary outer wrap, where the goods are contained in some form of primary packaging, such as a ow wrap or a tray? • Is the primary packaging a barrier to migration? If not, low migration inks should be used • Will the packaging undergo some form of secondary processing, such as in boiling water, an oven or a microwave? • Does the packaged food or other sensitive product contain mate- rials that make it a higher risk for migration, such as high sugar or fat content? Once the answers to these questions are understood, the packaging converter and the entire packaging supply chain are in a better position to select appropriate materials for the manufacture of the packaging. ere are a variety of low migration inks, coatings and adhesives that can be used in this manufacturing process. ese include: • Low migration UV inks and coatings that avoid the use of low molecular weight raw materials including solvents, use polymeric photoinitiators and are fast curing with a high cross link density • Low migration EB inks and coatings that provide for optimum curing with irradiation by an electronic beam. Curing usually takes place in an inerted chamber, with a nitrogen atmosphere preferred when producing food packaging • Conventional oleoresinous inks designed for food packaging. ese are normally based on raw materials, such as specially modi ed resins, high molecular weight polyesters or vegetable oil derivatives. ese inks, under normal circumstances, do not migrate • Low migration water based coatings that avoid the use of ingredi- ents that have been identi ed as potential migrants. Water based coatings are made from specially selected polymers, but they also contain coalescing solvents, slip control agents, anti corrosion and anti microbial additives in order to be fully e ective Other consumables that should be optimized for the manufacture of low migration packaging include fountain solutions and press washes, which could leave migratory residues on the nal printed JULY 2014 | FLEXO 43