These chippers are usually fed through vibrating tables, vibrating conveyors, rubber belts depending on the type of material to be processed and on the production requirements. The automatic feeding can eventually be supported by a metal detector to detect the presence of iron pieces before the material to be processed reaches the drum, reducing risks of accidents and damages.
The cutting system used by Pezzolato consists of a closed drum with staggered sections equipped with knives, a counter-knife, and an interchangeable calibration grid. This system guarantees the production of quality wood chips, as the closed drum allows the cutting length of the wood chips to be kept fixed and constant. The wood, subjected to the action of the knife, is transformed into calibrated chips, which are able to pass through the calibration grid immediately after cutting.
Worth mentioning is the system with the collapsible counter-knife: this system minimizes any damage caused by the accidental introduction of foreign bodies (not biomass) into the chipper.