A. Bulow et al., Migration of volatile compounds through stacked sheets of paper during accelerated ageing Part II: Variable temperature studies, RESTAURATOR, 21(4), 2000, pp. 187-203
Citations number
21
Categorie Soggetti
Library & Information Science
Journal title
RESTAURATOR-INTERNATIONAL JOURNAL FOR THE PRESERVATION OF LIBRARY AND ARCHIVAL MATERIAL
In order to investigate the effects of diffusion during paper ageing an alu
m-rosin sized, fully bleached, kraft paper was aged in stacks, at three dif
ferent conditions, and four different intervals. The stacks were open at th
e top to allow diffusion of volatile products to take place. Tests, includi
ng grammage, moisture content, brightness, yellowness, L*a*b*, zero-span te
nsile strength, pH and the degree of polymerization show less change in pap
er properties at the top of the stack than in the centre. This indicates a
diffusion effect where volatile compounds escape from the paper at the top
of the stack, but remain trapped towards the centre, where more severe degr
adation occurs. More work is required to determine if this diffusion effect
is the same at ambient conditions as it is at the elevated temperatures us
ed in this study.