2017 Volume 71 Issue 11 Pages 1337-1344
Research was conducted to clarify the relationship between natural ageing and accelerated ageing of paper using paper naturally aged for 90 to 130 years. In order to estimate the degradation rate of paper at room temperature, sealed tube method was conducted in four temperature comditions between 60 and 90℃. The degradation rate indicators at room temperature were calculated by Arrhenius plots. With regard to the estimated degradation rate indicators of tear and burst indices of paper samples at room temperature, degradation tended to be faster in sealed tube method than in suspension method.
On the other hand, degradation rate of discolouration showed an opposite result. The correlation of the hydrogen ion concentration before accelerated ageing and the estimated degradation rate indicator of tear index at room temperature showed better relationship than those at uniform higher temperature. Thus, in order to evaluate the permanence of papers，it is desirable to obtain room temperature degradation rate through Arrhenius plot.
