A machine used in recycling that cuts discarded plastic into thin rectangular shapes or square strips. Plastic shredders are used for large plastic pieces such as car bumpers, pipes and drums which are too big to handle for plastic granulators. The shredders are used to reduce volume. The shredded materials are then treated in washing plants and processed further in recycling plants so they can be granulated. Once granulated, old plastic can be used to manufacture new plastic products.