Using ultrasound to deink xerographic waste

Mixed office waste containing xerographic ink is becoming an important source of recycled fiber. This research examined the use of ultrasound to break down xerographic ink particles prior to removal by conventional flotation. The raw material was standard xerographic sheets printed with common toner...

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Bibliographic Details
Published in:Tappi journal 1995-12, Vol.78 (12), p.125-130
Main Authors: Scott, W.E. (Miami University, Oxford, OH.), Gerber, P
Format: Article
Language:English
Subjects:
AROMATIC HYDROCARBONS
BUTADIENE-STYRENE COPOLYMER
DECHET
DESECHOS
Flotation
HIDROCARBUROS AROMATICOS
HYDROCARBURE AROMATIQUE
IRRADIACION
IRRADIATION
mixed office waste paper
PAPEL
PAPIER
POLIMEROS
POLYACRYLIC ACID
POLYMERE
POLYMERS
PROCESAMIENTO
PROCESSING
Q1
RECICLAJE
RECYCLAGE DES DECHETS
RECYCLING
STYRENE
toners
TRAITEMENT
ULTRASON
ULTRASONIC TREATMENT
ULTRASONICS
ULTRASONIDO
WASTES
xerocopy paper
xerographic ink
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Summary:Mixed office waste containing xerographic ink is becoming an important source of recycled fiber. This research examined the use of ultrasound to break down xerographic ink particles prior to removal by conventional flotation. The raw material was standard xerographic sheets printed with common toners (styrene-butadiene and styrene-acrylate). Preliminary tests were carried out with a 500-W piezoelectric transducer capable of batch processing. Results from these tests provided a base for subsequent tests with an ultrasonic whistle suitable for continuous, flow-through operation. Both systems reduced xerographic particles to sizes suitable for removal by flotation. Performance of the continuous system was strongly affected by treatment pH, the number of treatment cycles, and pulp consistency. Response-surface methodology was employed to determine the best operating conditions for the ultrasonic whistle. Results for the continuous, flow-through ultrasound system suggest that scale-up experiments should be pursued.
ISSN:0734-1415