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Excimer laser cleaning of mud stained paper and parchment

Keywords: Excimer laser cleaning , Paper and parchment restauration , Limpeza com laser de excímeros , Restauro de papel e pergaminho

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Abstract:

The main advantage of excimer lasers when processing materials, its the emission of a radiation with wavelength in the ultraviolet region. This characteristic allows an extremely accurate and very well defined shape of material removal as well as total absence of heat affected zone and alterations in the material structure. In excimer laser paper and parchment cleaning, the mud is removed by breaking the physicalchemical bonding between this last one and the material to be cleaned not affecting neither its structure nor the chromatic pigment existing in some samples. A principal vantagem dos lasers de excímeros, no processamento de materiais, é a emiss o de um feixe luminoso com comprimento de onda compreendido na regi o do ultravioleta, permitindo urna remo ao do material com precis o muito elevada e excelente defini o de bordos, ausência de zona térmicamente afectada e ausência de altera es da estrutura. Na limpeza dos papéis e pergaminhos a lama é removida por quebra das liga es fisico-químicas entre a lama e o papel n o se afectando a estrutura deste, assim como n o se afectaram os pigmentos cromáticos existentes em algumas amostras.

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