Damage function for historic paper. Part II: Wear and tear

Heritage Science

Matija Strlič⁴  Carlota M. Grossi⁴  Catherine Dillon⁴  Nancy Bell⁵  Kalliopi Fouseki⁴  Peter Brimblecombe⁶  Eva Menart⁴  Kostas Ntanos⁵  William Lindsay⁵  David Thickett³  Fenella France²  Gerrit De Bruin¹ 

[1] Nationaal Archief, The Hague, The Netherlands

[2] Library of Congress, Washington, DC, USA

[3] English Heritage, London, UK

[4] Institute for Sustainable Heritage, University College London, London, UK

[5] The National Archives, Kew, Richmond, Surrey, UK

[6] University of East Anglia, Norwich, UK

关键词: Reliability engineering;    Mechanical properties;    Wear and tear;    Fitness for use;    Conservation;    Heritage management;   

Others  :  1234056
DOI  :  10.1186/s40494-015-0065-y

 received in 2015-07-31, accepted in 2015-11-11,  发布年份 2015

【 摘 要 】

Background

As a result of use of library and archival documents, defined as reading with handling in the context of general access, mechanical degradation (wear and tear) accumulates. In contrast to chemical degradation of paper, the accumulation of wear and tear is less well studied. Previous work explored the threshold of mechanical degradation at which a paper document is no longer considered to be fit for the purpose of use by a reader, while in this paper we explore the rate of accumulation of such damage in the context of object handling.

Results

The degree of polymerisation (DP) of historic paper of European origin from mid-19th–mid-20th Century was shown to affect the rate of accumulation of wear and tear. While at DP > 800, this accumulation no longer depends on the number of handlings (the process is random), a wear-out function could be developed for documents with DP between 300 and 800. For objects with DP < 300, one large missing piece (i.e. such that contains text) developed on average with each instance of handling, which is why we propose this DP value as a threshold value for safe handling.

Conclusions

The developed model of accumulation of large missing pieces per number of handlings of a document depending on DP, enables us to calculate the time required for an object to become unfit for use by readers in the context of general access. In the context of the average frequency of document use at The UK National Archives (Kew), this period is 60 years for the category of papers with DP 300, and 450 years for papers with DP 500. At higher DP values, this period of time increases beyond the long-term planning horizon of 500 years, leading to the conclusion that for such papers, accumulation of wear and tear is not a significant collection management concern.

【 授权许可】

   
2015 Strlič et al.

【 图 表 】

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