Arhivski vjesnik, Vol. 53 No. 1, 2010.
Pregledni rad
SALVAGE OF ARCHIVAL MATERIALS AFTER DISASTERS NEW POSSIBILITIES OF THE CENTRAL LABORATORY FOR CONSERVATION AND RESTORATION OF THE CROATIAN STATE ARCHIVES
Igor Kozjak
Sažetak
Throughout history, various books and documents have been damaged in numerous disasters including those that resulted in large amounts of soaked materials which have been subjects of many studies. Regardless of the potential causes of soaking, such as flood, burst water pipes, fire extinction or rain leakage, water is one of the greatest hazards for books and documents which are kept in archives and libraries throughout the world. Soaking of documents and books causes their physical deformation, dissolving of pigments and ink, smearing of seals and growth of microorganisms that degrade the organic material and create irreversible stains on written heritage. Central Laboratory for Conservation and Restoration of the Croatian State Archives uses specific techniques for prevention of these damages. Some of the specific methods used for drying soaked documents and books are: air drying, high temperature drying, dehumidification, freezer drying, cryogenic drying, vacuum thermal drying and vacuum freeze drying (lyophilization).
The main problem in the process of salvaging materials is the speed at which soaked materials dry. This paper comprehensively deals with the consequences of the influence of water on books and documents, and also describes aforesaid drying techniques with special emphasis on lyophilization. The latter method is predominantly used in food, medicine and pharmaceutical industries; however, in recent times, it has also become purposeful in saving valuable written heritage and exceptionally important in conservation of written materials. The method is based on the technique of the freeze drying process in which no liquid phase occurs. Economy and efficiency of the process of lyophilization depends mainly on the time of drying that may be anticipated through the use of a sorption-sublimation model. The model hypothetically presents the mathematical possibilities of calculating the drying time of onedimensional structures.
Ključne riječi
Center for Salvaging Archival Materials; Central Laboratory for Conservation and Restoration of Archives; drying; lyophilization; sorptionsublimation model
Hrčak ID:
62416
URI
Datum izdavanja:
15.9.2010.
Posjeta: 1.983 *