| 摘要 |
The invention discloses test methods and apparatus for evaluating the mechano-strain response of various materials, particularly paper and related materials. The moisture sorbed by a specimen is evaluated continuously by observing the change in moisture content of the air in a closed volume surrounding the specimen. The relative humidity of the closed air volume is maintained constant (despite changes in the mass of water vapor in the air) by adjusting the physical volume, and thus the total pressure, of the contained air mass. In a second form, the pressure is adjusted directly. Moisture sorbed by the specimen is calculated from the rise in internal pressure of the closed air mass needed to hold relative humidity constant.
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