In an effort to examine the velocity of water absorption of yarns, as a fundamental study of water absorption of cloth in general, the author made model yarns equivalent to Vinylon 70D, i. e. multi-yarns of Rayon, Vinylon, and Moron. Effects of fiber materials and their twist on the water absorption were investigated.
1) As for Rayon, which is a hydrophilic material, yarns without twist showed the highest water absorption. The rate of water absorption decreased when the yarns were twisted. It re-mained the same, however, even when the twist of yarns was made tighter.
2) Tetoron, which is hydrophobic, showed the lowest degree of water absorption when the yarns were not twisted. The rate of water absorption increased when the yarns were twisted, but it decreased when twisting became tighter.
3) Vinylon, which is somewhere between Rayon and Tetoron so far as its affinity for water is concerned, showed, like Rayon, the highest degree of water absorption when the yarns were not twisted. But the rate of water absorption, unlike Rayon, continued decreasing as twisting increased, and remained the same over the twisting of 6 per cm.
In the case of tightly twisted yarns of Vinylon, the rate is the same as Tetoron, and lower than Rayon.
It is fairly difficult to theorize about this phenomenon, and our investigation is still going on.
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