Apparatus for measuring water vapor permeability through sheet materials
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United States of America Patent
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Aug 18, 1992
Issued Date -
N/A
app pub date -
Jun 17, 1991
filing date -
Jul 10, 1989
priority date (Note) -
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Abstract
An apparatus for measuring the water vapor permeability of sheet materials such as films, foils, paper and cardboard, under adjustable constant measuring conditions. A lid having an air inlet opening and an outlet opening is attached on a cup containing water in a vapor and airtight manner. A sheet material, its circumferential border sealingly held between the rims of the cup and lid, separates the water in the cup from the lid. An absorption member containing a moisture-absorbent material is in communication with the outlet opening. A blower in communication with the air inlet opening aspirates air through an air dryer and blows the resulting dry air into the sealed cup containing the sheet material, the permeability of which is to be measured.
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