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Development of a coating barrier for cork stoppers for their use in spirituous drinks F. Oliveira 1 , S. Pontes 1 , M. Cabral 2 and A. Mendes 3 1 The Network for Competence in Polymers, Faculty of Engineering, University of Porto, Portugal 2 Amorim & Irmãos Company, Mozelos, Portugal 3 Department of Chemical Engineering, Faculty of Engineering, University of Porto, Portugal. Presently, spirituous drinks such as vodka are not bottled using cork stoppers, despite the great appetence of the market for the noble product. The reason for that is the bleeding of natural colorants present in the cork stoppers to the white drink, making it looks like old conhaque. Two approaches could in principle be followed to make the cork stoppers compatible with spirituous drinks. The first one is the extraction of these colorant compounds leaving a colorant-less cork stopper. The other approach concerns the development of a food approval and highly flexible transparent coating, impermeable to the colorant compounds and chemically stable. At first glance none of these approaches seem to be easy to accomplish. This is indeed true and there is presently no good solution for this challenge. The extraction of the natural colorants, namely tannins, from cork stoppers proved only to delay the color bleeding, even when the extraction was applied to fine cork granules. Different extracting solvents were employed as well as supercritical carbon dioxide. Some authors proposed the use of polymers such as silicon [1, 2]. Despite the great permeability of this polymer, it is food approval, elastic and chemically resistant. It also seems to retain, sorb, the bleeding colorants from the cork stopper. However, silicon is also not able than delay the bleeding of colorant to the beverage. The authors tool advantage of the polarity of the cork stoppers colorants and developed a coating system considering two layers. The first layer fences the colorants to leave, due to its charge, while the second layer provides mechanical resistance to the coating. Both polymers are commercially available and are applied by dip coating. The final coating system is food approval, very elastic, chemically stable and gas permeable. Moreover, it is tasteless, transparent and visually attractive. Presently, a new monomer is being investigated that for developing a polymer that offers complete barrier properties with a single layer. References: [1] WATKINS, S. (1997), Coated cork stopper, WO9711894; [2] LUMIA, G., PERRE, C., ARACIL, J. (2001), Method for treating and extracting cork organic compounds, with a dense fluid under pressure, WO0123155; 47
PARALLEL ORAL SESSIONS II – POS.II.2 THURSDAY, FEB. 21 II.2 - HOUSE & LIVING Gonçalo Furtado & Albino Lima 45 The Architect's House Joana Ferraz 205 Organic living | Weekend house in Castelo de Paiva P. Geraldes Santos, N. Brandão Costa 171 From RCR experience to a project of a small house in the mountain F. Costa Leite, N. Brandão Costa Casa Comum [common/collective/communitarian house/home] Architectures for an Intermediary 122 Space Nuno Travasso 43 The Courtyard and Siza's Houses H. Henriques 155 The silence and the sky: seclusion and architecture. Four courtyard-houses. A. Silva Fernandes, C. Machado
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IJUP08 First Meeting of Young Resea
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Adrián Silva Dinis Cayolla Ribeiro
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