Abstract
AbstractChanges in the stress‐strain curve for paper undergoing cyclic loading have been studied as a function of moisture content. It has been found that the extensional stiffness of the paper progressively decreases at both low and high moisture levels but progressively increases at intermediate moisture levels. The moisture content at which the transition from decreasing to increasing stiffness occurs (when passing from low to intermediate moisture content) has been determined and for the particular paper used in these experiments has been shown to correspond to a relative humidity of approximately 60%. It is postulated that at low and high moisture levels, conditions are not favorable for interfiber bond re‐formation, whereas conditions are favorable for such reformation at intermediate moisture levels.
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