〔報告〕閉架書庫に発生したカビ対策事例

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Libraries in Japan are not air conditioned for 24 hours due to various reasons. However, because of such reasons as the demand for saving energy after the Great East Japan Earthquake of 2011 and abnormally hot summer and cold winter,mold growth hasincreased in libraries.The collection of the Institute’s library is based on the collection of publications for the study of art history.It consists of books and manuscripts dating from before the Edo period as well as books and exhibition catalogs and periodicals from the Meiji era. About 180,000 volumes of books and approximately 120,000 periodicals are available. The present report describes the collaborative work of researchers/librarians/conservators in the archive section and conservation scientists,both of the Institute,hoping that it will provide useful information for libraries troubled by molds. By examining the structural characteristics of the library,such as air conditioning and its constraints from the measurement of temperature and humidity data,it was found that the cause of mold growth,temperature and humidity,could not be controlled from June to September every year. As a countermeasure, thorough cleaning was first carried out to remove molds.Next,as a measure against the inflow of outside air,the doors of each room were closed, and air circulation was improved by installing blowers. By creating a closed space and operating dehumidifiers so that the absolute humidity does not exceed 10 kg/kg, the archive environment improved. The criteria for checking the propagation of fungi by ATP＋AMP wiping inspection for books were also tested.For the first time in the world, ultraviolet fluorescent photographs of a mold breeding area were taken by using ultravioletrays close to visible light so as not to damage materials. In conclusion,it is important for library staff to monitor temperature and humidity for any abnormal change, especially in humidity variation.

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