Pulverizer machines are used to smash materials into tiny shards or granules. Pulverizer machines can crush all types of items, including glass, aluminum, concrete, plastic, coal, rock, resin, tires, and medical waste. Pulverizer machines come in a number of different forms. Hammer mills, ring mills, double roll crushers, granulators, wood hogs, impactors, and shredders are all forms of pulverizer machines.