Ultrasonic Processing of Hardwood Fiber, 2005 Papermakers Conference

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This is the second part of a systematic study on the effect of ultrasonic energy on papermaking fiber development. Begun in 2004 with northern, bleached softwood Kraft pulp, the study is continued by examining the effect of ultrasound on Penobscott bleached hardwood (HW) Kraft pulp. Five minutes of 31-35 kHz ultrasound was applied at 3.67 hp-day per ton per second of refining time.

Ultrasonic energy has minimal effect on unrefined fibers but was found to increase the bonding index of recycled fiber. The harsh, uncontrolled environment of the disk refiner was found detrimental to HW fiber recycling. Ultrasonic processing promotes greater inter-fiber bonding and final product strength for recycled HW fibers.

Author: Poniatowski, S.E., Walkinshaw, J.W.
Ultrasonic Processing of Hardwood Fiber, 2005 Papermakers Co
Ultrasonic Processing of Hardwood Fiber, 2005 Papermakers Conference
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