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The effects of softening agents on the wetting of textiles were investigated by mea suring the capillary spreading of liquid as a function of time. The values of the exponent n during phase II of the capillary spreading of softened fabrics increased in comparison with those of unsoftened fabrics owing to the adsorption of the softening agent, which made the fiber surface more hydrophobic and produced a larger advancing contact angle of the fiber to the water (θ A ). Based on experiments with DTAC as a softening agent for nylon, the following quantitative relationship was found between the value of the exponent n and the advancing contact angle of water (θ A ): n = (4.62 X 10 -3 )θ A , - 0.001. From this, reasonable advancing contact angles were also estimated for other fabrics.
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Kawase et al. (1986) studied this question.
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