Ageing Behaviour of Encapsulated Paper
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| Format: | Article |
| Language: | English Slovak |
| ISSN: | ISSN 0034-5806 |
| Online Access: | http://www.viks.sk/chk/res_2_99_108_115.doc |
| Abstract: | Summaries. This paper presents a study on the effects of paper encapsulation using a laminated uncoated polyester pouch and a slight vacuum. Because due to wrapping the environment inside of the pouch differs to the environment outside, the so-called inpouch and outpouch environment was investigated firstly. After adjusting the climate conditions two papers, wrapped and unwrapped, were subjected to an artificial ageing. The chemical, mechanical and physical changes of the papers were evaluated. It was concluded that paper encapsulation has no direct effect on the change of mechanical properties during artificial ageing. However, paper acidification, for example, was more extensively during artificial ageing for the papers stored in the pouches and thus care has to be taken for storing acid papers encapsulated. Conclusion. Based on the approach, that the inpouch environment has to be equal to the outdoor environment during ageing studies, in our case 24 days at 70°C and 55% RH, the conclusion can be drawn that encapsulation of paper using a laminated uncoated polyester pouch and a slight vacuum, will neither influence the mechanical paper properties in a positive or negative way in time. However, paper deterioration will continue and paper acidification will even be enhanced by the paper encapsulation. It is suggested therefore that only for deacidified papers this accelerated acidification will not occur. Based on the artificial ageing experiments, care has to be taken for storing acid papers encapsulated. |
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| ISSN: | ISSN 0034-5806 |
