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    Expert's Opinion

    Food-Safe Packaging Print: RadTech Europe Seminar Explores UV/EB Curing

    Seminar focused on advantages of fast-curing, low-VOC printing from UV/EB and UV-LED technologies.

    Food-Safe Packaging Print: RadTech Europe Seminar Explores UV/EB Curing
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    RadTech Europe01.18.19
    The migration of components from packaging materials to foodstuff is certainly not a new consideration for packaging printers, brand owners and co-packers, but it continues to represent an area of global concern in terms of health and safety.

    As the broad base of packaging expands, and the printing processes for such packages also expand, it is becoming increasingly difficult to monitor and control the safety of food packaging print. The situation is even more complex due to the absence of a harmonized EU law for printing inks and commonly agreed methods for risk assessment. This is also true for printing inks that are UV/EB cured, although EuPIA and the Swiss Ordinance provide sound and recognized guidance for all types of printing inks and food packaging coatings. Pressure-sensitive and gummed labels; in-mold labels; flexible packaging; and even direct-to-container print all represent considerably different routes to achieving the same end result, and all are used in the world of food packaging.   

    RadTech Europe explores the current agenda
    RadTech Europe’s biennial Food Packaging Seminar, held recently in Stuttgart, brought together an impressive audience representing the highly-complex supply chain – from raw material and ink suppliers and converters to brand owners – that represents today’s packaging print industry. RadTech Europe has been focusing on food safety challenges and opportunities for several years and has an established reputation for factual reporting as well as for thought leadership in this arena.    
     
    This year’s seminar – introduced and moderated by RTE General-Secretary Mark Macaré and Paul Kelly of Univar Ltd – focused on how the entire food packaging value chain can benefit from the fast-curing and low-VOC print offered by the UV/EB and UV-LED technologies. The agenda combined lively expert presentations with panel discussions and Q and A sessions with delegates.    

    Reviewing the chemistry
    The seminar agenda spanned all the major topics. Luc de Waele of Allnex, one of the leading global producers of industrial coating resins and additives, reviewed the relevant chemistry, highlighting activities at UV- and EB-resin production level that support energy curing for food packaging via new special chemical grades; compliance with the EU REACH chemical regulations; and the nature of today’s popular food packaging material substrates in partnership with today’s printing technologies. After all, printing inks for food contact materials are a real growth field for radiation-curable resins.

    Risk management
    As Manfred Hoffmann of Amcor Flexibles EMEA said, "Product safety is about proactive risk management," especially for packaging converters. He went on to show how this is achieved by his company in an active in-depth programme of analysis and process control of UV-and EB-curable systems which must, at the same time, take into account the supply chain security, the very low migration limits of acrylates and initiators and, of course, the new printing technologies.

    ‘Think like a food company’
    Of course, it is the brand owner´s first and foremost responsibility to ensure food safety. With an overall brief to manage Nestlé’s multidisciplinary approach to food packaging safety within the company’s extensive product portfolio, Dr. Amaury Patin from Nestlé’s Swiss research center enlightened seminar participants on Nestlé’s very comprehensive and much-admired system.   

    With more than 2,000 products – all packaged in printed packaging -- and over 400 factories in 85 countries, the need for in-depth analysis and control of quality – both quantitative (e.g. in migration) and qualitative (in respect of compliance with established standards and regulations) – is, he said, paramount. It is also costly and challenging. The lack of international and harmonized regulations and the complex and "often fragile" supply chains led Nestlé to create its standards for materials in contact with foods. This standard includes the Nestlé Guidance Note on Packaging Inks, which is updated every two years. 
     
    This Nestle Guidance is today almost the handbook on guidance for producers of food-safe packaging. Nestlé is also committed to eliminating non-recyclable plastics and unsustainable packaging material combinations in order to achieve 100% recyclable or reusable packaging by 2025. As Dr. Patin advised seminar participants, it pays to "think like a food company."

    Legislative update
    Dr. Martin Klatt of BASF and RTE HSE Chairman went on to provide an overview of developments in European food contact legislation. With the current lack of a harmonized legislation on printing inks, he advised the audience to depend upon the EC Framework Regulation 1935/2004 and the Good Manufacturing Regulation EC 2023/2006. In addition, he advised using the Swiss Ordinance, the EuPIA guidelines for printing inks; and the voluntary stewardship guidance documents of major brand owners such as Nestlé. He added that Cefic and the FCA provide valuable risk assessment guidelines including modern tools such as the concept of “Threshold of Toxicological Concern."   
     
    These help manufacturers, and downstream users of food contact materials in the packaging value chain to undertake the necessary, and often complex, component testing and risk assessments. 

    Packaging Ink Industry Initiatives
    This overview was followed by an outline of the position of the Packaging Ink Joint Industry Task Force on planned EU measures on printed food contact materials. Dr. Nick Ivory of Sun Chemical and chairman of the EuPIA energy curing workgroup sketched the involved and inharmonious current industry regulatory situation. The PIJITF represents the entire value chain from ink raw material manufacturers to food business operators – an impressive compilation of leading suppliers within the broad packaging industry.  
     
    The Task Force proposal for a regulation in relation to printing ink layers – including those on plastic food contact materials – whether directly in contact with food or not, represents an opportunity to achieve swift implementation of a system that meets current best practice and regulation, and ensures that substance migration limits are based on toxicological evaluation rather than simply on default limits.   

    In pursuit of a defined ink industry focus, EuPIA is, he said, considering developing a database to create a common basis for risk assessment, and photoinitiator suppliers are seeking to establish a global trade association. Dr. Ivory added during the Q&A session that followed, in the face of a changing/developing print technology base, "We have to develop the inks that work."

    Advantages of UV flexo
    At the very heart of that changing and developing print technology base is the flexo process and, as Federico d’Annunzio showed, it is a process that has enthusiastically embraced radiation curing. As Bobst’s head of the flexible materials unit, he detailed the advantages of in-line narrow- and mid-web UV flexo across a wide spectrum of packaging types, from linerless, glue-applied, and pressure-sensitive labels to cartons, stand-up pouches, and sleeve labels. UV digital flexo technology is the latest pressroom development, combining higher productivity with the help of LED lamps with the ease of maintenance and safety of EB lamps. 

    d’Annunzio defined the ‘digital flexo revolution’ as a winning combination of UV flexo with digital automation and, of course, the benefits of an extended color gamut. With a selection of case histories, he underlined the versatility of the process and ended his presentation with an interesting comparison of the similarities and differences of digital flexo and straight digital print.

    Radiation curing and inkjet
    The agenda moved into the digital arena with a holistic approach to UV inkjet from Steve Knight of Digital Direct Technologies. For the inkjet process, he said, "Different technical and scientific disciplines communicate with different vocabulary," and these processes range from physics and chemistry to engineering, electronics, software, surface science, and application technology, and he explored in depth the requirements for achieving full ink cure, from software to printhead calibration, that is the "recipe" for quality, consistent results.
     
    UVFoodSafe
    Completing the formal agenda for the day was the introduction of a new and highly-relevant industry initiative developed under the banner of international labeling association FINAT, with the cooperation of RadTech Europe: UVFoodSafe.      
     
    Its vision statement is direct and to the point: "To create confidence within end user and converter communities in the use of UV printing in food packaging and labels through education and the provision of application-specific best practice, enabling the consistent delivery of compliant print to the market."  

    Jonathan Sexton, chair of the UVFoodSafe steering committee introduced the program and the two start-up workgroups, which span process and print. UVFoodSafe is actively recruiting members for these work groups across the industry supply chain – and the RadTech Europe seminar was an opportunity to interest participants across the value chain.   
     
    Member organizations already include major press, inks, and lamp systems manufacturers, material manufacturers and converters, as well as FINAT and RadTech Europe – but, to move into serious concrete actions, more participants willing to contribute time to this worthy initiative are still needed.   
     
    The initial objective is to quantify and communicate deliverables in time for and Labelexpo 2019.
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