Abstract
The one-step lining and deacidification process of aged newspapers with double-sided writing combines deacidification and reinforcement processes. Wheat starch paste or carboxymethyl cellulose were prepared using an aqueous solution of Ca(OH)2. The newspapers were lined with Japanese tissue (9 g/m2), using the alkaline adhesive in order to mechanically reinforce the newspapers and at the same time increase the pH of the paper. After treatment, the pH value of the newspaper samples reached an ideal range between 8.0–8.5 when the w.1% Ca(OH)2 was used. More notably, the Japanese tissue lining doubled strength and folding endurance. The treatment had little impact on the visual appearance of the writing and even increased the degree of whiteness of the paper. The increase of tensile strength and whiteness was not diminished even when the treated newspaper samples were exposed to accelerated thermal ageing.
Zusammenfassung
Gleichzeitige Stabilisierung und Entsäuerung von gealterten Zeitungspapieren mit beidseitigem Druck
Die gleichzeitige Stabilisierung und Entsäuerung von gealterten Zeitungspapieren mit beidseitigem Druck kombiniert zwei Behandlungsschritte auf einmal. Weizenstärkekleister oder Carboxymethylcellulose wurden mit wässrigen Ca(OH)2 Lösungen zubereitet. Die Zeitungspapiere wurden mit Japanpapier (9 g/m2) und dem alkalischen Klebstoff kaschiert und so mechanisch verstärkt; gleichzeitig wurde der pH des Papiers angehoben. Nach der Behandlung erreichte der pH der Zeitungspapiere einen idealen Bereich zwischen 8,0 und 8,5, wenn der Klebstoff mit w.1 % Ca(OH)2 verwendet wurde. Darüber hinaus wurde durch die Behandlung eine Verdoppelung der Zug- und Falzfestigkeit erreicht. Die Behandlung hatte wenig Auswirkungen auf die visuelle Erscheinung der Schrift und erhöhte sogar die Weißheit des Papiers. Der Anstieg von Zugfestigkeit und Weißheit wurde auch nach der beschleunigten thermischen Alterung nicht verringert.
Résumé
Le doublage et la désacidification en une étape de vieux journaux imprimés sur les deux faces
Le procédé de doublage et de désacidification en une étape de vieux journaux imprimés sur les deux faces combine la désacidification et le renforcement. Une colle d’amidon de blé ou une carboxyméthyl cellulose ont été préparées dans une solution aqueuse d’hydroxyde de calcium. Les journaux ont été doublés avec un papier japon de 9g/m2 encollé avec l’adhésif alcalin afin de renforcer mécaniquement les journaux et d’augmenter en même temps le pH du papier. Après traitement, la valeur du pH des échantillons de journaux a atteint la valeur idéale de 8 à 8,5 avec la solution d’hydroxyde de calcium à 1%. Ce qui est remarquable, c’est que le doublage avec le papier japon a doublé la force et la résistance à la pliure. Le traitement a eu peu d’effet sur l’aspect visuel de l’écriture et a même augmenté le degré de blancheur du papier. L’augmentation de la résistance à la tension et la blancheur n’ont pas diminuées même après vieillissement thermique accéléré.
About the authors
Meifang Zhang is PhD, Professor and acted as Visiting scholar in Pittsburgh University from Sep. 2006 to Sep. 2007. She is the vice chairman of Archive Preservation Commission of China, and the chairman of National Image Technology Standard Commission. She is also an expert of ISO TC171 SC1, and the editor of “digital and microfilm image”. She has published 72 articles on preservation or heritage. Major book publications include “Theory and Practice for Documents Heritage Preservation Management”, “Archives preservation technology”, “Identification of Archives”, “Recording and Storage Technology of Information”, “Treasure of National Archives of Canada”, (Translate), “Prevention and Cure of Archives Pests”, and “Mounting Technology of Archives in China”, member of the 7-expert panel of rescue and treatment on Beichuan earthquake archives.
Fuze Jiang is a postgraduate at the Department of Chemistry, Renmin University of China. He majors in inorganic chemistry and focusses on the field of paper conservation.
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