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Extrusion of pastes with a piston extruder for the determination of the local solid and fluid concentration, the local porosity and saturation and displacement profiles by means of NMR imaging |
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| Authors: | Joachim Götz Wolfgang Kreibich Marian Peciar |
| Institution: | Institut für Mechanische Verfahrenstechnik und Mechanik Universit?t Karlsruhe (TH) Postfach 6380, 76131 Karlsruhe, Germany e-mail: Joachim.Goetz@bl.tum.de, DE Bruker Medical Gmbh Rudolf-Plank-Str.23 76275 Ettlingen, Germany, DE Slovenska Technicka Univerzita Bratislava, Slovac Republic, SK |
| Abstract: | Nuclear Magnetic Resonance (NMR) was used to investigate the extrusion behaviour of PTFE pastes in a ram extruder. By means of 1H-NMR imaging (MRI) it is possible to determine the local proton density and therefore, the local fluid concentration. The 19F-MRI provides the local solid concentration. Thus the local saturation and the local porosity can be calculated with the information of the local fluid and solid concentration. Furthermore displacement profiles can be derived from NMR images by means of correlation techniques without any preparation or marking of the pastes. Received: 8 May 2000 Accepted: 1 May 2001 |
| Keywords: | Pastes Extrusion Piston extruder Local porosity and saturation Fluid and solid concentration Displacement profiles |
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