How It Works

Woodchippers in focus

Wood Chipping

Portable woodchippers are used to break logs into smaller chips for biofuel, manufacturing or recycling. There are three main components to the chipping machine: a hopper to feed the wood into the machine, a chipper mechanism and a collection bin.

The chipper mechanism is traditionally a rotating steel drum with reinforced steel blades along its length. The wood is drawn in by a combination of gravity and the rotation of the drum. Drum chippers rapidly break wood down, but are noisy and create large, uneven chips. Newer woodchippers use a steel flywheel instead of a drum. The wood is fed into the chipper on hydraulic rollers and blades on the face of the flywheel cut against a fixed anvil plate, producing uniform woodchips. Behind the disc are serrated paddles, which break down any bigger chips before the cut wood is ejected into a container.

Much larger ‘whole tree chippers’ have carbide flail hammers, which pulverise the wood by mechanical force rather than by cutting. These are very heavy and are usually towed by a truck.