The Natural Ageing of Paper After Exposure to Daylight
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| Format: | Article |
| Language: | English Slovak |
| ISSN: | ISSN 0034-5806 |
| Online Access: | http://www.viks.sk/chk/RES_4_00_229_237.doc |
| Abstract: | SUMMARIES. Sunlight, even after harmful UV has been filtered out, significantly degrades groundwood paper. The greatest changes in paper occur after approximately 30 days of irradiating. Short-term irradiation of paper initiates light induced oxidation reactions, which continue even after paper is stored in the dark. Mg in paper significantly inhibits light induced oxidation during direct irradiation of the paper and eliminates the influence of irradiation on the intensity of light induced oxidation degradation reactions, which are a characteristic of the natural ageing of paper. CONCLUSION. ˙ Irradiation of groundwood paper is a significant degradation factor comparable to the acidic degradation of this type of paper. ˙ Short-term irradiation significantly degrades groundwood paper. ˙ Short-term irradiation of groundwood paper initiates oxidation degradation reactions; they are continued during subsequent dark storage at room climate. ˙ Groundwood paper should not be placed in an environment without guaranteed controlled light conditions (exhibitions, study rooms, etc.). ˙ Deacidification of paper with Mg containing agents significantly inhibits light induced oxidation of groundwood paper, i.e. those that are initiated by irradiation previous to storage in the dark at room climate. ˙ It might be questioned whether this inhibition effect is also true for other oxidation processes in the paper. |
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| ISSN: | ISSN 0034-5806 |
