Abstract
A sample of fresh viscose rayon of water content of 220% was placed in a constant velocity air current and dried to various residual water contents R% and the changes in the swelling degree Q and the iodine sorption J were observed in reference to R and the air conditions.Q and J decrease with decreasing value of R, and drop sharply when the combined water of cellulose begins to evaporate. Q and J at equivalent R are smaller when the rayon has been dried at higher temperature and in more humid air.When these dried samples are placed for a month at 20°C and 65% RH, Q and J decrease further and the decrements are smaller as R becomes smaller. When R reaches the equilibrium moisture content corresponding to the air conditions, J does not change any more in the above conditioning at 20°C and 65% RH.When the rayon which has been dried to the equilibrium water content corresponding to the air condition is immersed in water and dried again, Q and J change similarly as they do in the primary drying but less in degree.The air condition: 15_??_80% RH at 60° and 90°C.
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