Extrusion von Flachfolien - Untersuchungen von Foliendefekten

This master thesis was created due to a cooperation of the company SML and the "Institute of Polymer Extrusion and Compounding" at the Johannes Kepler University in Linz and deals with the classification, the causes, the origin and the prevention of local film defects. It specially deals with polyolefin based films which are manufactured with a flat- or cast-film line. The whole process has been divided into five sections from the raw material to the finished product. In each section all included components are discussed in terms of relevance for film defects. For the master thesis experiments were carried out by an existing plant, which should show the influence of the raw material, of the edge trim recycling and of the melt filtration. For continues control of the film quality, this plant has his own optical control system, which was used to analyse the realized tests.