Abstract
With ramie, Manila hemp and Japanese hemp cords immersed in water, the amount of absorbed water and the change in length and diameter were studied by the method stated in the previous paper, and the following results were obtained: (1) When the cord in water is not loaded, the amount of water, absorbed per unit mass of the cord till the end of t hours' immersion, q, is given by q=Q0(1-e-a0t)+Q1(1-e-a1t)+Q2(1-e-a2t), where the constants α0, α1, α2 and the ratio of the constants, Q0:Q1:Q2, chiefly depend on the kind of fibre. (2) Whether the cord in water, is loaded or not the value of Q0+Q1+Q2 or Q depends mainly upon the apparent specific volume of the cord and partly on the kind of fibre and the twisting of cord. (3) Whether the cord of ramie fibre, ramie yarn or Manila hemp fibre is immersed in water or exposed in air, the change in length, Δl, and that in radius, Δr, resulted by 24 hours' loading follow the formula, Δl=-BΔr, where the value of B almost coincides with the calculated value of 4π2(N-n)2a2r0/l0, where N and n are the number of the upper and the lower twists of cord respectively, r0 and l0 the radius and the length of cord respectively, and a is a costant (1/2 in this case). The value of B of the loaded cord of Japanese hemp fibre is different in water and in air, suggesting that certain change in the fibre takes place when the cord is immersed in water.
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