30 novembre 2015 ~ 0 Commentaire

Foam extrusion of thermoplastic polyurethanes using CO2 as a blowing agent

The foaming of thermoplastic polyurethanes with CO2 as a blowing agent reduces material input for existing applications and in addition leads to improved materials properties for new applications. Therefore the correlations between procedure parameters and the resulting foam quality happen to be examined in this paper. The solubility behaviour of CO2 in the polymer melt is analysed by screw extruder machine means of a high pressure sorption balance. For the foam extrusion of the temperature and shear delicate polymer, the influence of the screw geometry on the extrusion process is examined. Initial extrusion experiments have led to TPU foams with a density below 0,4 g/cm3.

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