Extruded foam sheets of low densities in combination with a homogenous distribution of fine-celled bubbles show a wavy pattern transverse to the machine direction. This effect known as corrugation is systematically investigated in a long-term research project at the IKV. The aim of the project is to determine the process and foam parameters which lead to corrugation and thereafter develop strategies to minimise the corrugation in foam extrusion. In this paper, the research project is presented and first results of the investigations are discussed.
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