Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1998-08-20
1999-11-09
Bollinger, David H.
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209210, 209638, B03B 528
Patent
active
059796642
ABSTRACT:
Methods and apparatus for acoustic fiber fractionation using a plane ultrasonic wave field interacting with water suspended fibers circulating in a channel flow using acoustic radiation forces to separate fibers into two or more fractions based on fiber radius, with applications of the separation concept in the pulp and paper industry. The continuous process relies on the use of a wall-mounted, rectangular cross-section piezoelectric ceramic transducer to selectively deflect flowing fibers as they penetrate the ultrasonic field. The described embodiment uses a transducer frequency of approximately 150 kHz. Depending upon the amount of dissolved gas in water, separation is obtained using a standing or a traveling wave field.
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Bollinger David H.
Institute of Paper Science and Technology, Inc.
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