Title: Predicting photoyellowing behaviour of mechanical pulp containing papers
Author: Agarwal, Umesh P.
Source: Proceedings of the 59th APPITA Annual Conference and Exhibition incorporating the 13th ISWFPC (International Symposium on Wood, Fibre, and Pulping Chemistry), held in Auckland, New Zealand (May 16-19, 2005). [Carlton, Victoria, Australia]: APPITA, c2005. Pages 9-14.
Description: It is well known that paper produced from mechanical-pulp-containing fiber furnish yellows upon exposure to light. Although the accelerated light-aging test method has been used to compare papers and predict long term performance, the reliability of the light-aging method has been questioned. Therefore, a method that can correctly predict a paper’s light stability is desirable. In this work, a new technique is proposed that is capable of ranking papers for their photoyellowing characteristic and is based upon the amount of the pulp-hydroquinone present. The technique entails quenching, by oxygen, of the laser-induced fluorescence (LIF) of paper. The LIF of both mechanical pulp containing papers and hydroquinone model was found to be sensitive to molecular oxygen indicating that the latter structures were almost certainly the cause of the oxygen sensitivity of the paper’s LIF. The hydroquinone structures have already been shown to be involved in the mechanism of photoyellowing. Using the LIF method, photoyellowing behavior of 15 printing and writing papers- both mechanical pulp-containing and mechanical pulp-free - was predicted and compared to the papers’ ranking based on the accelerated light aging test. For these papers, photostability rank from accelerated aging and fluorescence quenching were found to be some what different. The reasons for such differences are not yet clear. Irrespective of the disparity, the conclusion was that the oxygen sensitivity of the LIF is a method that is potentially suitable to predict the photostability of the mechanical pulp containing papers.
Keywords: Photoyellowing, mechanical pulping, paper, photostability, hydroquinone, accelerated aging, fluorescence
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Agarwal, Umesh P. 2005. Predicting photoyellowing behaviour of mechanical pulp containing papers. Proceedings of the 59th APPITA Annual Conference and Exhibition incorporating the 13th ISWFPC (International Symposium on Wood, Fibre, and Pulping Chemistry), held in Auckland, New Zealand (May 16-19, 2005). [Carlton, Victoria, Australia]: APPITA, c2005. Pages 9-14.
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