A plastic shredder is a machine used to cut plastic into smaller pieces for granulation. Unlike plastic granulators, shredders are designed specifically for larger plastic waste, like car bumpers, pipes, drums, and other items too big for granulators.
In the process, large plastic items are fed into the shredder. Moving at a slower speed than a granulator, blades break the plastic down into smaller chunks. These pieces are then collected and washed and treated in washing and recycling plants before being granulated and sent to manufacturers.
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Other Sources
Pyle, Richard. “What’s the difference between Shredding, Grinding, and Granulating?” Jordon Reduction Solutions. http://www.jordanreductionsolutions.com/blog/the-difference-between-shredding-grinding-and-granulating/. Accessed August 16. 2016.