1. Lviv National Polytechnic University,Department of Chemical Technology of Plastics Processing,Lviv,Ukraine
2. Lviv National Polytechnic University,Department of Heat Engineering and Thermal and Nuclear Power Plants,Lviv,Ukraine
3. Technical University of Kosice,Department Technologies, Materials and Computer Aided Production,Kosice,Slovak Republic
4. Lublin University of Technology,Department of Technology and Polymer Processing,Lublin,Poland