Apparatus for measuring the transmission rate of volatile organic chemicals through a barrier material
First Claim
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1. An apparatus for measuring the transmission rate of volatile organic chemicals through a barrier material, comprising:
- a) a test cell having means for clamping a barrier material sample between a first and second chamber;
b) means for introducing a flow of test gas containing volatile organic chemicals into said first chamber;
c) means for introducing a flow of carrier gas into said second chamber, and means for conveying gas from said second chamber;
d) a cryotrap having means for connection to said means for conveying gas from said second chamber; and
e) a flame ionization detector selectively coupled to said cryotrap, including means for measuring the organic chemicals collected in said cryotrap.
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Abstract
A system for measuring the transmission rate of volatile organic chemicals through a barrier material, where a barrier material sample is clamped in a test cell so as to form a chamber on both sides of the material, with a temperature-controlled test gas conveyed into one chamber and a temperature-controlled carrier gas conveyed through the other chamber. The carrier gas is passed through a cryotrap where the organic chemicals are collected, and the carrier gas with collected chemicals is then burned in a flame ionization detector to measure the quantity of organic chemicals.
29 Citations
13 Claims
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1. An apparatus for measuring the transmission rate of volatile organic chemicals through a barrier material, comprising:
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a) a test cell having means for clamping a barrier material sample between a first and second chamber; b) means for introducing a flow of test gas containing volatile organic chemicals into said first chamber; c) means for introducing a flow of carrier gas into said second chamber, and means for conveying gas from said second chamber; d) a cryotrap having means for connection to said means for conveying gas from said second chamber; and e) a flame ionization detector selectively coupled to said cryotrap, including means for measuring the organic chemicals collected in said cryotrap. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for measuring the transmission rate of volatile organic chemicals through a barrier material, comprising:
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a) a test cell having means for clamping a barrier material sample between a first and second chamber; b) a gas conduit coupled into said first chamber, including means for selectively cooling the gas in said conduit to a first predetermined temperature; c) a carrier gas conduit coupled into said second chamber including means for selectively heating the gas in said second chamber to a second predetermined temperature, higher than said first temperature. d) an oven having means for heating to a third predetermined temperature, higher than said second temperature, and a carrier gas outlet conduit connected between said second chamber and said oven; e) a cryotrap having means for heating or cooling to a fourth predetermined temperature and a conduit connecting said cryotrap to said carrier gas outlet conduit; and f) a flame ionization detector connected to receive carrier gas from said cryotrap, whereby said flame ionization detector measures the volatile organic chemicals in said carrier gas. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification