Steam-and Heat-Setting of Nylon 6 Fibre

IV. The Relationship Between Heat-Setting and Swelling

Abstract

In succession of the previous reports, we examined the swelling of different heat-set nylon 6 fibres in sulfuric acid solution. These results showed that steam-set fibre had good dyeing property, but was very difficult to swell compared with that with dry-heat-setting and without heat-setting. This tendency was very similar to increase of density described in the first report and it was found that the difficulty of swelling depended rather on crystal region than on amorphous region.