The Effect of Different Strengthening Methods on Different Kinds of Paper
| Main Authors: | , |
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| Format: | Article |
| Language: | English Slovak |
| ISSN: | ISSN 0034-5806 |
| Online Access: | http://www.viks.sk/chk/res_2_97_51_72.doc |
| Abstract: | SUMMARIES. Five different papers, three old ones, as they might be the object of a Strengthening treatment in the restoration workshop, have been strengthened according to four different relevant treat-ments (or six, as one of them was used in three variants), submitted to accelerated ageing and checked for the Strengthening effect, its stability and for change in aesthetic appearance. All methods, namely splitting using different adhesives for the core, overall Strengthening in the leafcasting machine, lamination using a heatset acrylic and Parylene coating, gave sufficient strength to thé papers, Parylene coating with the alarming exception that it provokes enhanced decay during accelerated ageing of groundwood paper. The impact of the different Strengthening methods is depending on the kind of paper. Leafcasting seems to be best apt for old, Parylene coating for modem supercalandered and coated paper. As one of the methods, i.e. overall Strengthening in the leafcasting machine is not very well known in thé conservation community, a more detailed description is given to explain thé procedure. CONCLUSION. As a general result it can be stated, that splitting, overall strengthening in the leaf-casting machine and laminating give good strength to paper endangered by brittle-ness and have a good ageing stability. From the aesthetic point of view leafcasting turns out to be superior to the other methods. If really brittle papers are concerned, as they participated in this project only in their state after ageing, this statement might need to be limited: Overall strengthening by leafcasting means that the strengthening fibre is put onto the surface of the object, while for splitting it is put into the interior. Possibly for brittle paper the tissue must be made thicker: so thick that the aesthetic appearance is affected. For splitting of re ally brittle paper a thicker core might be necessary, again with negative influence on aesthetics, i.e. on thickness and stiffness. Any synthetic adhesive, it might be used for the core in splitting or as hotmelt for laminating was found to have a negative influence on the papers as compared to starch and methyl cellulose. Parylene, on the other hand, again a synthetic, gave surprisingly positive results: very satisfactory for modem smooth papers, best apt for thé coated. Highly alarming, however, is thé négative influence of this treatment on thé ageing behaviour of groundwood pa-per. Its mechanism and thé relevance of thé results of accelerated ageing to thé real ageing behaviour must be further studied. |
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| ISSN: | ISSN 0034-5806 |
