Conservation of Wood Artifacts: A Handbook by Dr. rer. nat. Achim Unger, Professor Dr. Arno P. Schniewind,
By Dr. rer. nat. Achim Unger, Professor Dr. Arno P. Schniewind, Professor Dr. rer. nat. Wibke Unger (auth.)
The impetus for this ebook used to be the need to systematically manage the extant literature at the conservation of cultural estate made from wooden, from its beginnings ahead of the Christian period to the yr 2000. quite a few released stories and monographs, together with Holzkonservierung (Wood Conserva tion) released through the senior writer in 1988, have seemed through the years, particularly in English and in German. they've got supplied exemplary deal with benefit of person components or features of wooden conservation, yet a comprehen sive, up to date exposition of old and present advancements has been missing. the various specialist fields of the authors, in addition to their insights into equipment of conservation and recovery of wooden artifacts in Europe, North the US, and Asia supplied a pretty good foundation for the good fortune of this lower than taking. one of many pursuits in the course of the exam of the literature used to be that not just recognized conservators and scientists from international locations which are leaders in wooden conservation might be represented, yet that much less recognized, frequently now not as comfortably available contributions also needs to be integrated. purely during this demeanour was once it attainable to attract a finished photograph of the nationwide and foreign nation of wooden conservation. The artwork and Archaeology Technical Abstracts (AATA) of the Getty Institute have been very useful in our efforts to judge as many courses as possible.
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Extra info for Conservation of Wood Artifacts: A Handbook
Although the resistance of wood to biological deterioration depends on many factors, woods of lower density tend to have lower natural resistance. Natural durability of wood species is increasingly taken into consideration in wood construction. 5 shows a list of selected US native and imported species classified according to the decay resistance of the heartwood only, since the sapwood of all species has little or no natural resistance. Methods of determining wood density are discussed in Chapter 6.
5). Cellulose and the hemicelluloses are polysaccharides and are known collectively as holocellulose. Lignin is aromatic in nature. In addition, small quantities of polymeric substances such as starch, pectins, gums, and proteins may occur in wood. The extraneous substances are generally of relatively low relative molecular mass, and may be organic or inorganic. The organic extractives may include phenolics, terpenes, aliphatic acids and alcohols (as esters) as well as water soluble mono- and disaccharides.
C Q) ..... 0 Desorption () Q) I... c 10 recent wood ::J t:T w 40 60 80 100 Relative humidity (%) Fig. 3. Desorption isotherms for waterlogged oak. 1 Wood-Moisture Relations 31 compared with recent wood. The data show that hygroscopicity in old, waterlogged wood increases to varying degrees. The reasons are to be found in the extent as well the mechanism of the decomposition. Age alone did not appear to be a factor in the increase of hygroscopicity, at least in the case of oak. Shrinking and swelling behavior of waterlogged archaeological wood is of major importance to its drying and stabilization.