Polyester (PET) and polypropylene(PP) nonwovens are often used as barrier fabrics for personal absorbent products. A property which is important for their function is the breakthrough pressure of a liquid in the transplanar direction. This is the pressure required to force a liquid across the fabric to reach the absorbent phase. Breakthrough pressure depends on the wettability of the fabric, which in turn depends on the wettability of the fiber, characterized by the cosine of the contact angle (cos theta ). The dependence of cos theta on the amount of mositure adsorbed in the surface and the continuity of the mositure film is not cleary known.
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