1. Faculty of Mechanical Engineering and Management, Institute of Materials Technology, Polymer Processing DivisionPoznan University of Technology, Piotrowo 3, 61‐138 Poznań Poland
2. Faculty of Chemical Technology and EngineeringUniversity of Science and Technology in Bydgoszcz, Seminaryjna 3, 85‐326 Bydgoszcz Poland
3. Institute of Chemical Technology and EngineeringPoznan University of Technology, Berdychowo 4, 60‐965 Poznań Poland