〔報告〕津波等で被災した文書等の救済法としてのスクウェルチ・ドライイング法の検討―処理後の塩分残留量について―

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When paper documents are affected by seawater, such as by tsunami, squelch-drying technique is one of the choices among possible treatment methods. The squelch-drying technique is generally performed repeating the following steps:1. cutting polyester sheets and newspaper to the size of documents; 2. wrapping each document with a layer of polyester sheet and newspaper (15 to 20 sheets at least)as a water absorbent, and putting it into an oxygen-barriered film bag;3. sealing the bag with a heat-sealer using a vacuum pump. In the present study,documents were soaked in 3.5% saltwater to evaluate the amount of residual salts in them after treatment. Documents processed by squelch-drying technique or air-drying technique were oven-dried and weighed to estimate the weight of residual salts. Concentration of chloride ion extracted from the samples was also, measured to estimate the amount of residual salts on sheets of selected pages. As a result, it was found that the squelch-drying technique could not remove the residual salts of the documents completely but that salts were reduced to some extent compared with the case of air-drying. Thus, the squelch-drying technique can be a promising option to rescue wet documents as one of the initial responses.

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