A New Method for the Assessment of Deteriorated Paper Documents
A New Method for the Assessment of Deteriorated Paper Documents
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评估劣化纸质文件的新方法
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
T. Okayama
中科院分区：
文献类型：
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作者：
T. Okayama
为了评估图书和纸质文献的老化特性，开发了一种使用声发射（AE）监测的新方法。声发射监测是一种非破坏性或有限破坏性的技术，它监测材料在应力下发出的高频声音，以确定小规模损伤的发生和发展。通过测量从AE传感器接触纸张表面的时刻到检测到最大AE振铃计数的时刻的时间，可以评估纸张的劣化程度。为了研究声发射监测对受损纸张评估的适用性，使用自然老化的商业无木浆纸和旧书纸作为测试样品。我们试图确定AE监测是否可以有效地区分自然老化的纸张在良好和不良的条件。在酸性纸中达到最大AE振铃计数所需的时间比在无酸纸中所需的时间短得多。在条件差的书纸样本中，达到最大AE振铃计数的时间比从保存完好的书中提取的样本短得多。在自然老化的商业纸张中，达到最大AE振铃计数的时间与撕裂强度和冷提取pH值相关。这些研究结果支持使用声发射信号来监测旧的和有价值的纸质材料的保存水平。
To assess the ageing characteristics of books and paper documents, a new method using acoustic emission (AE) monitoring was developed. AE monitoring is a non-destructive or a limited-destructive technique that monitors high frequency sounds emitted by a material when it is under stress to determine the onset and progression of small-scale damage. By measuring the time from the moment the AE sensor contacts the paper surface to the moment the maximum AE ring-down counts are detected, the extent of deterioration of the paper can be evaluated. To investigate the applicability of AE monitoring for the assessment of damaged paper, naturally aged commercial wood-free papers and paper from old books were used as test samples. We tried to determine whether AE monitoring could effectively discriminate between naturally aged papers in good and poor condition. The time taken to reach the maximum AE ring-down count in acidic papers was considerably shorter than that taken in acid-free papers. The time to reach the maximum AE ring-down count in samples of book paper in poor condition was considerably shorter than in samples taken from well-preserved books. The time to the maximum AE ring-down count was correlated with tearing strength and cold-extracted pH in naturally aged commercial paper. These fi ndings support the use of AE signals to monitor the preservation level of old and valuable paper materials.