Measuring and testing – Moisture content or absorption characteristic of material
Patent
1992-12-31
1994-11-08
Williams, Hezron E.
Measuring and testing
Moisture content or absorption characteristic of material
73 6451, 73 38, G01N 1500
Patent
active
053616278
ABSTRACT:
A method and apparatus for measuring the capillary attraction developed at a surface of an absorbent body intended to be used in a sanitary article such as a sanitary napkin, a diaper, a urinary pad, an adult brief, a tampon or a wound dressing, among others. The apparatus comprises a probe of fritted glass providing an array of capillary passageways in fluid communication with the interior of a closed cell completely filled with liquid. A pressure sensor mounted to the closed cell observes the liquid pressure therein. When the probe is placed in contact with the absorbent body, the capillary attraction exerted on liquid in the probe capillaries by the porous network of the absorbent body is transmitted through the liquid medium in the cell to the pressure sensor. The pressure data thus obtained reflects the state of dryness of the absorbent body surface. The capillary attraction measurement is made with no appreciable transfer of liquid toward the absorbent body to avoid altering its condition.
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F.A.L. Porous Media, "Fluid Transport on Porous Structure", Academic Press, 1992, p. 131.
Johnson & Johnson Inc.
Roskos Joseph W.
Williams Hezron E.
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