Power Requirements for Producing Wood Chips

This study reports the effect of certain variables on the power required to produce pulp chips. Variables investigated were spout feed angle, knife sharpness angle, chip length, density, and knife sharpness. Tests were performed with a 39-inch, three-knife disk chipper cutting 4-inch by 4-inch by 8-foot samples of Acer saccharum, Ater rubrum, Populus sp., Tsuga canadensis, and Picea sp. Power consumption was measured by a strain gage dynamometer and recorded on an oscillograph. The results show that spout feed angle has little effect on chipping power. Knife sharpness angle noticeably affected power consumption, with blunt knives requiring more power. Long chips require less power per unit volume than do short chips.

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