Protecting and preserving clear barrier layers for flexible packaging materials In‐line thermal evaporation of organic topcoat layer

The end market for transparent flexible barrier films is larger than for metallized films. Presently, the market is still dominated by polymeric barrier layers but the used chemicals may be harmful for the environment. An alternative would be transparent thin layers deposited by vacuum deposition techniques using reactive processes. Ceramic materials like silicon oxide or aluminum oxide are used having a film thickness of just ～10 nm, a coating uniformity of +/?5% across and along the film at a barrier performance below 2.0 sccm/m²d for oxygen transmission rate (OTR) and below 1.0 g/m²d for water vapor transmission rate (WVTR) on PET substrates. In this paper, details will be provided about the deposition processes for these barrier layers using thermal evaporation, plasma‐assisted thermal evaporation as well as deposition by electron beam evaporation. An important factor for these high barrier transparent coatings is also to withstand the downstream processes in the whole packaging stream like slitting, lamination, printing etc. One solution is to protect the barrier layers by a Topcoat. For example, off‐line deposition of lacquers is used in field but the market penetration is low due to high process and material costs. An in‐situ Topcoat deposition is a smart solution to overcome this issue saving time and costs. Such an approach will be also described in the presentation and the impact on the performance of the final package will be discussed.     

Friendship homophily among ethnic German immigrants: A longitudinal comparison between recent and more experienced immigrant adolescents.

Immigrant adolescents have been found to show high levels of friendship homophily (the tendency to prefer intra-ethnic over interethnic friends). Based on acculturation theories, we predicted longitudinal changes and interindividual differences in level and rate of change in friendship homophily by immigrant composition of school, parental objections to the cultural adaptation of their offspring, discrimination, and language use. Altogether 218 newcomer and 272 experienced adolescents who had emigrated from the former Soviet Union to Germany participated in 4 annual assessments. Friendship homophily was assessed by percentage of intra-ethnic friends. Results revealed higher levels of friendship homophily among newcomer (75%) than among experienced (65%) adolescents at Time 1, and a significant decrease over time was found only among newcomers. Higher age, higher percentage of immigrants at school, and lower levels of new language use all related to higher friendship homophily. Rate of change in friendship homophily was strongly related to change in new language use. Findings suggest that friendship formation with native adolescents is related to social learning processes, in which new language use plays a crucial role. (PsycINFO Database Record (c) 2010 APA, all rights reserved)