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Influence of different deinking efficiency of waterbased flexographic ink from model cellulose surfaces and sheets
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
2004 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 19, no 2, p. 250-256Article in journal (Refereed) Published
Abstract [en]

The influence of UV-light, temperature, atmospheric

environment and storage time on the ink detachment of

water-based flexographic ink printed on model cellulose surfaces

was investigated using an impinging jet cell equipment. The

printed surfaces were deinked using a NaOH solution (pH = 10)

and the deinking process was monitored using a microscope

equipped with a CCD camera. Images were collected at different

time intervals during the detachment process and image

analysis was used to quantify the ink detachment from the surface.

Hand sheets, (the same pulp as used for model surface

preparation) were also printed and stored under the same conditions,

after which they were reslushed and deinked. The deinking

efficiency of the recycled sheets was evaluated using

brightness and ERIC (Effective Residual Ink Concentration)

values. It was shown that UV-light had a negative effect on ink

detachment both from the model cellulose surfaces and from

the hand sheets. At storage temperatures of 55°C, (dark conditions

were used) a large negative effect was observed for the

cellulose surfaces while only a small effect on the ink detachment

could be seen for the hand sheets. Ink detachment from

the hand sheets became more difficult when increasing the storage

temperature above 55°C, as detected as a decrease in

brightness of the recycled and deinked sheets. A further increase

in the storage temperature to 105°C gave poorer ink detachment

efficiency than storage under UV-light for the hand sheets.

Air had a more negative effect on ink detachment than nitrogen.

Place, publisher, year, edition, pages
2004. Vol. 19, no 2, p. 250-256
Keywords [en]
deinking, flexographic ink, model surfaces, fibres
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-2328DOI: 10.3183/NPPRJ-2004-19-02-p250-256Local ID: 1809OAI: oai:DiVA.org:miun-2328DiVA, id: diva2:27360
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2017-12-12Bibliographically approved

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Forsström, Jennie

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