Experimental Investigation of the Recovery of Soaked Paper Using Evaporative Freeze Drying

Autor: Antonello Barresi, Elena Crespi, Antonio Capolongo, Davide Fissore
Rok vydání: 2008
Předmět:
Zdroj: Drying Technology. 26:349-356
ISSN: 1532-2300
0737-3937
DOI: 10.1080/07373930801898141
Popis: The aim of this article is to develop an experiment and a procedure to investigate the restoration of water-damaged paper and archival materials using freeze drying in order to allow a reproducible test and comparison of the influence of different operating conditions on drying time and restored paper quality. Firstly, a reproducible method for the preparation of soaked samples simulating water-damaged paper has been developed. Then, the samples have been freeze-dried in a laboratory-scale apparatus that allowed monitoring the temperature as well as the weight of the samples. The technique of evaporative freezing, which reduces the drying time required, has been used in this case. An innovative procedure for the visualization of the progress of the drying process has been validated, thus allowing the validation of a simple phenomenological model of the time evolution of the ice core volume; in addition, data on the residual moisture of the dried paper sheets in different zones have been given. Finally, op...
Databáze: OpenAIRE
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