A newer chipper design employs a steel disk with knives mounted upon it as the chipping mechanism. 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, such as Asplundh, are disk-type.
Consumer-grade disk-style chippers usually have a material diameter capacity of 6 to 18 inches (15-46 cm). Industrial-grade chippers are available with discs as large as 160 inches in diameter, requiring 4000-5000 horsepower.
According to the structure of the cutter disk, the disk chipper could be divided into the plate cutter disk and helical cutter disk. Among them, the helical cutter disk chipper is the most advanced design, which could produce the chips into similar size. And this is important for the paper mill to produce paper pulp. Especially for the irregular logs or leftover bits and pieces of trees, the normal wood chipper could not produce the qualified chips with these materials. But for the helical cutter disk, these materials could be well utilized.
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