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The main atmospheric component in the conditioning of paper is relative humidity which determines moisture content. This moisture acting as a plasticizer affects strength, rigidity, and plasticity. Changes in moisture content produce dimensional changes in the fibers which in turn are translated into over-all dimensional changes in the sheet. Examples are given showing the importance of relative humidity in testing, specification, converting, and end use. Other conditioning and weathering factors are discussed.
Willets, William R.
Assistant ManagerChairman ASTM Committee D-6 on Paper and Paper Products, Titanium Pigment Corp., a Subsidiary of National Lead Co., New York, N. Y.