Abstract
There are two methods of heat setting of nylon fabrics, i.e. dry heat setting and wet heat setting (steam setting). As a result of comparative examination, in respect of dyeing property, of the materials treated by those two methods, it was proved that diffusion velosity is higher, and absorbed quantity is larger in the materials treated by wet heat setting than in those processed by dry heat setting, even if those materials are equal in density. It was presumed that in the method of wet heat setting, due to the presence of water molecule, locomotion of molecule segment in amorphous region is easy, the growth of crystallit is conspicuous, the gaps between crystallits become large, and that in the method of dry heat setting crystallit increases in number rather than in volume, crystallits that are smaller than those in the method of wet heat setting are scattered in places, and gaps between crystallits become smaller.
