Performance Tests on the Powered Back-Up Roll

A powered back-up roll designed and manufactured by Premier Gear and Machine Works and Lloyd Controls was installed at Boise Cascade Corporation’s Yakima plywood plant in October 1981. Design of the unit was based on an experimental model installed at the U.S. Forest Products Lab in Madison, WI. A description is given of the powered back-up roll, along with the concepts behind its operation. Tests performed on the unit indicate that it is functioning as predicted. Accurate positioning of the roll head and precise speed control of the rolls are combined to provide auxiliary torque to the veneer block. Spin-out reductions have been realized on both Douglas-fir and white fir 1/8- and 3/16-inch peels, but most dramatically on the white fir 3/16-inch peel. Spin-out reductions result in an equivalent 2 percent veneer recovery increase, 10.9 percent stud recovery increase, and 6.6 percent chip recovery decrease. It is predicted that the machine will pay for itself in 1 year or less.

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