Grinders, such as the Peterson Pacific 7400A Horizontal Grinder, are size-reduction machines used in the beginning stages of the recycling process. Use of a grinder to process raw materials and prepare them for reuse reduces landfill overflow and creates a variety of new products. These versatile pieces of equipment are used in a variety of industries, with construction/ demolition debris recycling, asphalt shingle recycling and wood waste recycling ranking among the top few.
Hot-mix asphalt (HMA) is currently the largest market for recycled asphalt shingles (RAS). Using recycled asphalt reduces the demand for virgin asphalt cement and aggregate, which economically benefits HMA producers. The fibers from the felts and fiberglass found in shingles give cold patches made from RAS a longer life compared to those made of other materials. Recycled shingles that are ground into gravel and used to cover unpaved roads have been proven to minimize dust, reduce the amount of gravel lost into side ditches and reduce vehicle noise on these roads. These roads also tend to have a longer life and require less maintenance.
Another growing industry that calls for shredding is wood waste recycling. With the range of recycled products made from wood waste spanning from shoreline erosion prevention products to fish and bird habitats to reusable mulch for trails, landscape, gardening and playgrounds, the wood recycling industry is on a lucrative rise, making the purchase of a shredder more cost-effective than ever.
Grinders use abrasion and compression to pulverize materials to a reduced size, using a series of wheels, drums and plates to process the material. Material is passed through a wide feed hopper, falling into the grinding chamber. Often, grinders use a hammermill in the grinding chamber to process the shingles. In this case, the grinding chamber contains a rotating hammer rotor with swinging hammers that crush the shingles and drive them through a screen, thus using impact grinding to reduce the material into smaller scraps. Some grinders come equipped with a grapple for easy loading, if not some form of loader is often used in the shingle recycling process to transfer the shingles from the fill pile into the grinder. Grinders are available in high or low speed models.
Common applications include concrete block, concrete reinforced pipe, brick, asphalt, cinder blocks, C&D waste, timber, railroad ties, wood waste, pallets, edgings, process slabs, bark, trees, pole peelings and other bulky materials. Grinders are very versatile pieces of equipment, widely used in the asphalt recycling, wood recycling, shingle recycling, construction debris recycling, plastic recycling, MSW recovery and E-waste recycling industries. Grinders are used worldwide in manufacturing raw products such as construction and demolition material, mulch and boiler fuel and are also used in processing municipal yard waste into usable mulch.
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