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Volume: 23 | Article ID: art00072_2
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The Application of High Intensity Ultrasound to the De-inking of Recycled Papers
Anna Fricker
Robert Thompson
Andrew Manning
  DOI :  10.2352/ISSN.2169-4451.2007.23.1.art00072_2  Published Online :  January 2007
Abstract

This paper presents work done by the authors on the application of high intensity ultrasound to the de-inking of waste papers printed with digitally printed inks. These include fused toners, indigo inks and UV cured coatings. Generally, these are considered to be ‘difficult to de-ink’ systems when present in conventional recycling de-inking plants because they are difficult both to detach from the paper fibres and to break down to particle sizes that can be removed by conventional flotation techniques.For all the systems investigated it was possible to both detach and reduce the size of particles down to flotatable size range of 20 to 120 microns. Temperature was found to play a role in heat fusible toner printed materials. De-inking of the tough films produced by UV curing inks showed no temperature dependence. Indigo inks which have been feared top present problems to the recycling industry found to be relatively easy to de-ink. The general conclusions are that the application of ultrasound can be used to aid the de-inking of waste paper and reduce the number of chemicals used.

Journal Title : NIP & Digital Fabrication Conference
Publisher Name : Society of Imaging Science and Technology
Publisher Location : 7003 Kilworth Lane, Springfield, VA 22151, USA
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 DOI 10.2352/ISSN.2169-4451.2007.23.1.art00072_2
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Anna Fricker, Robert Thompson, Andrew Manning, "The Application of High Intensity Ultrasound to the De-inking of Recycled Papers"  in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP23),  2007,  pp 804 - 808,  https://doi.org/10.2352/ISSN.2169-4451.2007.23.1.art00072_2

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Copyright © Society for Imaging Science and Technology 2007
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NIP & Digital Fabrication Conference
nip digi fabric conf
2169-4451
Society of Imaging Science and Technology
7003 Kilworth Lane, Springfield, VA 22151, USA
2169-4451(20070101)2007:2L.804;1-
nip_v2007n2/splitsection72.xml
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Articles
The Application of High Intensity Ultrasound to the De-inking of Recycled Papers
FrickerAnna
ThompsonRobert
ManningAndrew
01012007
2007
2
804
808
2007
This paper presents work done by the authors on the application of high intensity ultrasound to the de-inking of waste papers printed with digitally printed inks. These include fused toners, indigo inks and UV cured coatings. Generally, these are considered to be ‘difficult to de-ink’ systems when present in conventional recycling de-inking plants because they are difficult both to detach from the paper fibres and to break down to particle sizes that can be removed by conventional flotation techniques.For all the systems investigated it was possible to both detach and reduce the size of particles down to flotatable size range of 20 to 120 microns. Temperature was found to play a role in heat fusible toner printed materials. De-inking of the tough films produced by UV curing inks showed no temperature dependence. Indigo inks which have been feared top present problems to the recycling industry found to be relatively easy to de-ink. The general conclusions are that the application of ultrasound can be used to aid the de-inking of waste paper and reduce the number of chemicals used.