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Curling edges: a problem that has plagued scrolls for millennia.

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Qi-Wa, an unwelcome curl in Chinese scrolls, is caused by storage-induced strain, not moisture. Understanding this mechanical problem allows for improved mounting techniques to preserve delicate artwork.

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Area of Science:

  • Art Conservation Science
  • Materials Science
  • Meso- and Nanoscale Science

Background:

  • Qi-Wa, or "up curl," is a persistent issue in traditional Chinese hand scrolls and hanging scrolls.
  • This curvature negatively impacts aesthetics and can damage delicate fibers and ink.

Purpose of the Study:

  • To investigate the primary cause of Qi-Wa, moving beyond traditional explanations.
  • To develop a mechanical understanding of Qi-Wa formation.
  • To propose effective solutions for mitigating Qi-Wa in mounted artworks.

Main Methods:

  • Experimental analysis of scroll deformation.
  • Development of theoretical mechanical models.
  • Molecular dynamics simulations to study strain distribution.
  • Testing modified mounting techniques on real scrolls.

Main Results:

  • Consistent scaling relations were derived for Qi-Wa height.
  • Storage-induced extrinsic curvature was identified as the essential factor.
  • Modified mounting techniques proved effective in mitigating Qi-Wa on paper.

Conclusions:

  • Qi-Wa is fundamentally a problem of plastic deformation and strain distribution from storage.
  • The study provides a mechanical framework for understanding and addressing Qi-Wa.
  • Findings have implications for preserving traditional art and developing flexible electronic paper.