The use of CAD applications in the design of shredders for polymers Marek Macko, Krzysztof Tyszczuk, Grzegorz Śmigielski, Józef Flizikowski and Adam Mroziński MATEC Web Conf., 157 (2018) 02027 Published online: 14 March 2018 DOI: 10.1051/matecconf/201815702027