Water absorbing and desorbing properties of nylon monofilaments used for tuna long line fishing were
investigated. Water absorbing experiments were conducted in distilled water at constant water temperatures,
10 ℃, 20 ℃ and 30 ℃. And, Water desorbing experiments were conducted at constant relative humidities, 20%, 60% and 85% at an air temperature 20 ℃.
For water absorbing process, the amount of absorbed water (Qs (mg/cm2)) was represented as the function
of time (t) elapsed, ln (Qs)=ln a十b ln(t), Where, a and b are constants.
The amount of absorbed water (Qs) and the rate of absorption (Ra (mg/cm2. h)) depended largely on the
For desorbing process, the following equation between the amount of water desorption (Qr (mg/cm2)) and
time (t) was obtained ; Qr=a'+ b' ln (t), Where, a'and b'are constants.
The rate of water desorption (Rr (mg/cm2.h)) was largely affected by relative humidity. The time (td) required
for drying the nylon monofilaments can be estimated from the desorption equation, (6) when Qr= 0. The
drying time (td(day)) estimated ranged 0.6-1.6 at relative humidity 20%, 2.9-9.1 at relative humidity 60% and
∞ at relative humidity 85%, respectively.