Article

Goberge, shimbari, go-bars: the use of flexible sticks for clamping

Authors:
  • Royal Pavilion and Museums
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Abstract

The purpose of this paper is to present a versatile clamping system to apply controlled pressure during the consolidation of objects or when adhering parts into position. Known as shimbari in Japan, this technique uses flexible fiberglass or bamboo sticks braced against a frame to provide clamping pressure. This paper describes readily available equipment that can be used and discusses how the principles can be adapted to solve a wide range of clamping problems. Additionally, the paper presents case studies to illustrate the use of the shimbari technique along with several variations. This method works well for objects that do not allow for conventional clamping and can be applied to a range of lacquered, japanned, painted, veneered, or inlaid surfaces.

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... Areas of delaminating lacquer surface were consolidated with 5-10% w/v Paraloid ® B-72 in xylene, with pressure applied to the surface using the shimbari method ( Fig. 6) (Bainbridge et al., 2015). Xylene was selected as the solvent used for consolidation as it is an efficient solvent for Paraloid ® B-72 and is less likely to swell or blanch the lacquer surface (McSharry et al., 2011). ...
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The Mazarin chest is one of the finest pieces of Japanese export lacquer (urushi) to have survived from the first half of the seventeenth century. Much of the value of this piece lies in the decoration, which is finely executed using a wide range of techniques. To date, the conservation of Japanese lacquer has been characterized by distinctly different approaches in Japan and the West. In an effort to reconcile these differences, a unique collaborative Anglo-Japanese approach has been adopted for the conservation of this object. In 2005, 12 Japanese and western consolidants for metal foil were compared, ranging from synthetic resins to collagens and urushi-based adhesives. In the absence of urushi-gatame treatment of the photo-degraded surface, Paraloid B-48N was selected for consolidation of metal foil (hyomon, kanagai and kirikane) decoration on the Mazarin chest.
. Conservation of furniture
  • S Rivers
  • N Umney
Rivers, S., and N. Umney. . Conservation of furniture. Oxford: Butterworth Heinemann. .
. Conservation of the photodegraded surface of the Mazarin Chest
  • Y Yamashita
  • S Rivers
Yamashita, Y., and S. Rivers. . Conservation of the photodegraded surface of the Mazarin Chest. In East Asian lacquer: Material culture, science and conservation, ed. S. Rivers, R. Faulkner, and B. Pretzel. London: Archetype. -.