cutting rotor as main part of pelletizer used to cut PET, PBT, PA, PS & other materials cutting rotor as the core part of strand pelletizer is used to cut / chip the strand going into cutting chamber into pellet in speficified size (adjustable), used to cut material PET, PA, PBT, PS, PC, PE, PMMA and other engineering plastics. Underwater Strand Pelletizer