| abstract |
The present invention relates to a method for producing expanded thermoplastic polyurethane particles, comprising the steps of: a) melting the thermoplastic polyurethane in a first extruder (E1), b) in a second extruder (E2) injecting a gas blowing agent, c) uniformly impregnating the gas blowing agent into the thermoplastic polyurethane melt in a third extruder (E3), d) extruding the impregnated thermoplastic polyurethane melt through a die plate, and In underwater pelletizing equipment, the melt is pelletized under conditions of temperature and pressure to form expanded thermoplastic polyurethane particles. |