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Analysis of defect formation in flexible foam mouldings

von Prof. Dr.-Ing. Dr.-Ing. E.h. Walter Michaeli, Dipl.-Ing. Oliver Grönlund, Dipl.-Ing. Florian Meyer, Dipl.-Ing. Simon Latz

Very high reject rates are sometimes encountered in polyurethane (PUR) flexible foam moulding, especially during the commissioning of new foam moulds. The causes for the for mation of these defects, such as areas of hardened foam and collapsed zones, are currently unknown. The aim of this paper is therefore to promote an increase in the process knowledge for polyurethane flexible moulded foams by building up a basic, practice oriented understanding of the process. To this end, correlations between process parameters and the formation of defects in flexible moulded foams are identified in the experimental part of this work.