Apparatus for measuring water vapor permeability through sheet materials
OwnerGeorges H. Lyssyinventor
Life of this patent
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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.
Claims12
An apparatus for measuring the water vapor permeability of a sheet material under adjustable constant measuring conditions comprising:
- a cup (1) containing water (W);
- a lid (2) attachable on said cup (1) in a vapor and airtight manner, said lid (2) having an air inlet opening (4') and an outlet opening (5');
- a seal (3) disposed in a circumferential cup rim of said cup (1) and a circumferential lid rim of said lid (2), said seal (3) sealingly holding a circumferential border of said sheet material;
- a primary absorption member (5) capable of transmitting a fluid in communication with said outlet opening (5'), said primary absorption member (5) containing a moisture-absorbent material;
- a blower (6) in communication with aid air inlet opening (4');
- and
- an air dryer (7) in communication with said blower (6), whereby air is aspirated by said blower (6) through said air dryer (7) and introduced into said air inlet opening (4').
Dependencies are inferred from the claim text.