Abstract
A sensitive gravimetric method is described which is capable of measuring the rate and total amount of uptake of liquid in the direction perpendicular to the plane of a fabric under known negative pressure gradients. This version of the so-called demand wettability experiment is especially useful when spontaneous transplanar uptake is rapid. Two experimental variables have been examined: the effect of the filter paper used to hold the liquid column in contact with the specimen and the influence of compression of the fabric. A number of system parameters have also been investigated: the surface tension of the wetting liquid, durable press resin treatment of a cotton fabric, several surface treatments of a wool fabric, the proportions of polyester and cotton in blended fabrics, and differences between three commercial paper towels.
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