20 Exploring conservation and restoration techniques for plywood or laminated wooden objects Possibilities of re-adhering KEYWORDS: Ply- Laminated wood; re-adhering; adhesives; testing adhesives. The mechanised production of veneers has revolutionised the production not only of furniture, but also aeroplane, automobile, train carriage and boatbuilding industries in the early 20th century. Wood based materials, such as ply- and laminated wood have been engineered to provide excelled strength and stability to a shape or board. Using veneers, 3-dimentional shapes with much sharper curves can be achieved. The use of ply- and laminated wood also means a reduction of weight and material loss. Early ply- and/or laminated wooden pieces pre-dating 1930 are often produced using animal and plant-based adhesives. However, to achieve even more durable and resilient products, artificial adhesives such as Urea-Formaldehyde, Phenolformaldehyde and Melanin formaldehyde were mainly used in the later manufacturing phase. Although a very durable and resilient product, quite severe damages occur that prove to be very destructive and difficult to restore. Because of the nature of the material build-up these objects may require an alternative approach to the treatment of a piece made from traditional materials. The aim of the research to be presented was to examine and explore materials and methods of both irreversible and reversable nature and to evaluate the choice of adhesive used in restoration and interactions between old and new bonds of re-adhered delaminated plywood and of re-joined split pieces. Seven adhesives were selected including fish glue, Paraloid B72®, Mowital B30® (polyvinyl butyral), UHU® Wood glue D3 (polyvinyl acetate), ‘water resistant’ casein, polyurethane and an epoxy, and tested by treating a range of damages induced to plywood structures. Accelerated aging tests, using a climate cabinet and glue shear tests were applied, to ascertain the strength of the bond. During the evaluation of the samples, it became apparent that adhesives generally seen as “acceptable” in conservation might not be as compatible with ply- and laminated wooden structures. janna.simonemostert[at]gmail.com
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