Advanced Materials: TechConnect Briefs 2015Advanced Materials TechConnect Briefs 2015

Polymers Chapter 9

Non-destructive imaging analysis of unstable foam structures using 3D computed tomography

A. Eggert, M. Müller, F. Nachtrab, J. Dombrowski, A. Rack, S. Zabler
Fraunhofer Institute for Integrated Systems IIS, Germany

pp. 559 - 562

Keywords: foam, high-speed CT, micro tomography, X-ray imaging

In this contribution a laboratory CT setup is presented allowing the acquisition of 3D data sets in less than 15 s. The suitability and possibilities of such a system for unstable foams and other porous materials will be shown. Reached limits for the CT system: - 14 s measurement time for a complete 3D recording - 3.5 µm resolution for small objects - constant climate conditions (temperature and moist) - time-resolved structure characterization - non-destructive From the 3D data the microstructure of the foam can be measured directly. For example to analyse the air fraction of the product regarding air volume and bubble size distribution, accurately and with an extensive set of statistics. Apart from the foams structure, its dynamic changes over time were studied in place without interference. Thereby bubble growth, shrinkage and fusion can be observed or followed. The results of these investigations can be used for developing new micro structured food products and for a better understanding of the relation between the production and the structure of foamed material.