| Abstract: | SUMMARIES. The poster presents new products as well as the evaluation of methods in the conservation of graphic documents in specialized Romanian laboratories. A new paper product, with high content of viscose fibre, is similar to Japanese paper. Its features are suitable for the conservation of old documents. As the new type of paper is destined to conservation activities, the raw material had to answer the requirements of the final product. Viscose fibre was chosen because of its neutral pH, stability at ageing and permeability. The behaviour of the new paper in conservation-restoration treatment was evaluated by determining the thermal stability and UV exposure. A comparative study was done taking three types of Japanese paper as reference standards. They were all aged and described by physical, mechanic and chemical tests. Another tested product is Pullulan extracellular polysaccharide, used as a reinforcing agent of the permanence and durability of old papers. Its results were compared with those of methyl-, ethyl-, carboxymethyl- and hydroxypropyl-cellulose, and showed good adhesiveness to paper, lower viscosity than other polysaccharide derivatives and better stability against pH, salts or enzymes. Another new product is polyethyleneglycol (PEG). The study of its effects on the stability of the bleaching degree of old papers (with mechanical or semi-chemical pulp) was done on different papers produced in Romania between 1830–1914. By treating the papers with PEG solutions of various molecular masses, stabilization is achieved under the effect of heating and ultraviolet radiation, and consequently the ageing is reduced. The higher the molecular mass, the more efficient the PEG treatment for stabilization purposes. The evaluation of the durability of laminated papers was done using SEM–EDX and mechanical and chemico-physical tests at CRCDG Paris and showed that lamination of old papers does not modify fibre microscopy, increases paper durability, yet diminishing the bleaching degree. |
|---|
