Drying and gas or vapor contact with solids – Process – Gas or vapor pressure varies during treatment
Patent
1994-11-22
1996-07-23
Lopez, F. Daniel
Drying and gas or vapor contact with solids
Process
Gas or vapor pressure varies during treatment
34411, 422 40, F26B 504
Patent
active
055377602
ABSTRACT:
In a combined system or method for extending the life expectancy of an article of cellulosic material such as a book or other paper, the book or other paper is put in preservation storage at subnormal temperature and subnormal humidity. The resulting loss of flexibility of the paper is remedied upon withdrawal of the book or other paper from storage through its accelerated simultaneous exposure to a partial vacuum of about 5 to 50 torr and to water vapor; a partial vacuum of about 12 to about 30 torr is preferred. This procedure restores both the temperature and moisture content of the paper to normal values.
REFERENCES:
patent: 439149 (1890-10-01), Heilmann-Ducommun
patent: 1090971 (1914-03-01), Cilley
patent: 2856697 (1958-10-01), Fruth
patent: 5264243 (1993-11-01), Wedinger et al.
Donald K. Sebera, A Graphical Representation of the Relationship of Envirental Conditions to the Permanence of Hygroscopic Materials and Composites, in Proceedings of Conservation in Archives, International Symposium, Ottawa, Canada, May 10-12, 1988, printed in Paris, France, 1989 by International Council on Archives.
Lopez F. Daniel
The United States of America as represented by the Librarian of
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