Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1995-05-15
1996-05-07
Brock, Michael J.
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
055135153
ABSTRACT:
A method for measuring the permeability of a gas through a material, wherein the steps include exposing the material to the gas to be measured and measuring the outgassing characteristics of the material over increments of time, to develop exponential expressions representative of the measured amounts, and solving the exponential expressions for the diffusion coefficient D and the solubility coefficient S; and then calculating the permeability of the material by forming the product of the diffusion coefficient D and the solubility coefficient S.
REFERENCES:
patent: 3590634 (1971-07-01), Pasternack et al.
patent: 3604246 (1971-09-01), Toren
patent: 3618361 (1971-11-01), Stephens et al.
patent: 4464927 (1984-08-01), Reid
patent: 4656865 (1987-04-01), Callan
Article: "Measuring Gas Permeability of Plastic Films," Walter Soroka, Canadian Packaging, Aug. 1979, pp. 17 & 19.
Article: "Permeation Speeds Tests, Aids Choice of Exact Material," Murray, Dorschner, Package Engineering, Mar. 1983, pp. 76-80.
Article: "Permeability of Plastics," Carl W. Hall, Technical/Engineering Methods, Research, Testing, Nov. 1973, pp. 53-57.
Article: "Factors Affecting the Oxygen Barrier of Vinylidene Chloride-Vinyl Chloride Copolymers," Phillip T. Delassus, Saran and Converted Products Research, The Dow Chemical Company, Midland, Michigan 48640, "Plastics in Packaging," Nov. 1978, pp. 78-82.
Brock Michael J.
Modern Controls Inc.
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