抄録
Durability of papers, such as acid and neutral wood free papers, Japanese Kozo (Broussonetia papyrifera) and Gampi (Wikstroemia retusa) papers, as well as handsheets from Mitsumata (Edgeworthia papyrifera), Kozo, Manila hemp and softwood sulphate pulps, were compared by means of degradation rate or relative durability obtained from Arrhenius plots of folding endurance at various temperatures and relative humidities. It was confirmed that papers or handsheets from bast fibres for Japanese paper-making were less degradable compared with those from wood pulps.
Influences of acidity and sulphate ion concentration at handsheet making were also investigated. It was not perceivable that sulfate ion concentration was adversely so effective to durability of paper as acidity, which deteriorated properties of papers from bast fibres as well as from wood pulp.
