Conferences Succesfull 1ST IPPT_TWINN INTERNATIONAL CONFERENCE: Challenges, trends and solutions in developing and processing recycled materials On September 21 and 22, 2023, as part of the IPPT_TWINN project, the 1.st international conference on topic Challenges, trends and solutions in developing and processing recycled polymer materials was organized. The conference was organized and held at Faculty of Polymer Technology in Slovenj Gradec, Slovenia.