Melt spinning of carbon dioxide based thermoplastic polyurethane

A melt spinning process for carbon dioxide (CO2) based thermoplastic polyurethane (TPU) is explained in this thesis. The melt spinning process is successfully developed at technical scale at a winding speed upto 2500 m/min, which is the highest ever reached for polyurethane filaments in any spinning process. Filament spinnability is tested for a fineness range from 156 dtex to 1240 dtex. The filaments have a tensile strength equivalent to the industrial benchmarks. Elongation is lower than the benchmark and therefore a scope analysis is made to analyse the feasibility for implementation in industrial products. Melt spun elastic filaments can be used in the majority of elastic textile products. From an economical point of view, melt spun carbon dioxide based thermoplastic polyurethane filaments are 50 - 60 % cheaper than conventional solution polyurethane Filaments and thus Show a high market relevance.