The Impact of Lignin on Paper Permanence A Comprehensive Study of the Ageing Behaviour of Handsheets and Commercial Paper Samples
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English Slovak |
| ISSN: | ISSN 0034-5806 |
| Online Access: | http://www.viks.sk/chk/res_3_98_135_154.doc |
| Abstract: | Summaries. The accelerated ageing of handsheets and commercial papers at 80°C and 6.5%RH confirms that acidity is the most significant factor that affects paper stability. The addition of a buffering compound such as calcium carbonate is an effective way of improving the stability. This research shows that lignin does not have a negative impact on the ageing stability of mechanical and chemical properties of paper if it is buffered with a sufficient amount of calcium carbonate. The stability of the optical properties of papers made predominandy from high-yield pulps is negatively affected by the presence of lignin. Conclusions. The permanent paper research project examined the ageing behaviour of a comprehensive set of handsheets (prepared from six pulp types) and ten commercial papers. The results confirmed that acidity is the most significant factor that affects the stability of paper during accelerated ageing. The addition of calcium carbonate as a buffering compound is an effective way of improving the stability. This research shows that lignin does not have a negative impact on the ageing stability of mechanical and chemical properties of paper if the paper is buffered with a sufficient amount of calcium carbonate. However, the stability of the optical properties of papers made predominantly from high-yield pulps is negatively affected by the presence of lignin. |
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| ISSN: | ISSN 0034-5806 |
