Academic thesis

Alexander Johannes von der Heuvel: Laser application in Conservation – Laser supported Ablation – Removal of transparent varnish layers on wooden decorative chamber paneling at “Schloss Drachenburg”, Koenigswinter, Bonn. Feasibility study on technical and economical aspects Back
Language: Original   -   Translation
Abstract: A feasibility study of the use of laser radiation (Nd:YAG laser at 355 nm and 1064 nm) was carried out for removal of transparent over-paintings from historic varnish layers, including laboratory prepared samples and a historic decorative wooden chamber paneling. The aim was to evaluate the possibility, selectivity and efficiency of the laser cleaning method using different wavelengths and energy-densities on different over-paintings. A large number of samples were prepared with known characteristics (type and number of layers, composition)simulating investigated stratification of the historic paneling.
Samples with different top-layer compositions (transparent, dyed and slightly pigmented) were
irradiated with different wavelengths and energy-density to investigate ablation characteristics. A
set of diagnostic controls was used to study the effects of laser radiation on surface components, including optical examination analysis, such as UV-fluorescence and SEM techniques.
In addition to laboratory tests further investigations pursued the aim to compare laser application with traditional solvent-based techniques, such as solvent pads and solvent gels. Both techniques were carried out to remove the over-painting to uncover the historic varnish of the
decorative wooden chamber paneling.
Investigations aimed on technical and economical aspects of the results presented by testing
both techniques.


Keywords: wooden object, decorative chamber paneling, transparent coating, varnish, selective removal, laser, laser ablation, laser application
  • academic institution: Technische Hochschule Köln
  • kind of theses:  Diplomarbeit
  • main Tutor:  Prof. Dr. Friederike Waentig
  • assistant Tutor:  Prof. Dr. Robert Fuchs
  • date:  2005
  • pages:  288
  • pictures:  54

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