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At present, the consumption of thermal and acoustic insulating materials is increasing worldwide, therefore it is very important to look for possible ways how to produce these materials from secondary raw materials and thus save the primary material base. In the textile and automotive industry, a number of wastes are produced which contain very high purity PES fibers, often comparable with primary PES fibers. In general, most types of PES fibers used in industry have a very low thickness (between 10 and 20 microns...