Henan Doing Mechanical Equipment Co.,Ltd
We are an integrated manufacturer for research and develop, production and sales of pelletizing machine .

The original chipper design employs a steel disk with knives mounted upon it as the chipping mechanism. This technology dates back to an invention by German Heinrich Wigger, for which he obtained a patent in 1922. In this design, (usually) reversible hydraulically powered wheels draw the material from the hopper towards the disk, which is mounted perpendicularly to the incoming material. As the disk spins, the knives cut the material into chips. These are thrown out the chute by flanges on the drum. This design is not as energy-efficient as the drum-style design, but produces chips of more uniform shape and size. Most chippers currently used by commercial tree care companies are disk-type.

Consumer-grade disc-style chippers usually have a material diameter capacity of 6 to 18 inches (15 to 46 cm). Industrial-grade chippers are available with discs as large as 160 inches (4.1 m) in diameter, requiring 4,000 to 5,000 horsepower (3,000 to 3,700 kW). One application of industrial disk chippers is to produce the wood chips used in the manufacture of Particle board.

Newer chippers that is called drum wood chipper employ mechanisms consisting of a large steel drum powered by a motor, usually by means of a belt. The drum is mounted parallel to the hopper and spins towards the output chute. The drum also serves as the feed mechanism, drawing the material through as it chips it. It is colloquially known as a "chuck-and-duck" chipper, due to the immediate speed attained by material dropped into the drum.

Newer models have overcome many of these disadvantages with Auto-Feed Plus invented by Kurt Snider Published October 2000 Tree and landscape equipment trader magazine this digitally controlled Tachometer Auto reverses the hydraulic feed wheels. The reversible feed system allows the newer style drum chippers to handle larger diameter materials. Modern drum-style chippers usually have a material capacity of 6 to 20 inches (15-50 cm).