6th Section Printing and Packaging The Stability of Offset Inks on Paper Upon Ageing
| Hlavní autori: | , , , , , |
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| Médium: | Článok |
| Jazyk: | angličtina slovenčina |
| ISBN: | ISBN 80-227-1942-0 |
| On-line prístup: | http://www.viks.sk/chk/wpp26_2003.doc |
| Abstrakt: | SUMMARIES.The standard moist heat (80 °C and 65 % relative humidity, RH) and dry heat (105 °C) techniques of accelerated paper ageing were applied in stability investigations of offset ink films printed on alkaline offset paper. The results obtained, revealed the significant exponential decrease of relative optical density for MAGENTA and YELLOW ink layers. The variance in total colour difference E* (L*a*b* CIE) of ink films evidenced the considerable damage of CYAN and YELLOW ink films, especially upon moist heat treatment. The FT-IR spectroscopy was additionally used in the characterization of paper, inks, as well as ink films on paper before and after ageing. CONCLUSIOIN. The moist heat (80 °C and 65 % RH) and dry heat (105 °C) methods of accelerated ageing were applied in the stability investigations of CMYK ink films printed on alkaline offset paper. The exponential decline ofpaper brightness (paper yellowing) corresponding to the formal first-order kinetics was measured upon application of both ageing procedures, however only negligible changes were registered in the diffuse reflectance FT-IR spectra of aged paper samples. The highest variance of relative optical density during ageing was observed for MAGENTA and YELLOW ink films on paper. In contrary, the variations in visible reflectance spectra and in total colour difference E* (L* a* b*) evidenced the considerable damage of CYAN and YELLOW ink films, especially upon moist heat treatment. |
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| ISBN: | ISBN 80-227-1942-0 |
