Cellulose xanthate strips, gelatinized to various degrees in NH
4Cl bath (first bath) by varying the time running from nozzle to first roller, were regenerated successively under stretching in H
2SO
4 bath (second bath). Fine structures of regenerated cellulose filaments thus obtained were examined and the following results were obtained.
(1) When gelatination takes place freely under the condition in which a gelatinizing strip slacks in NH
4Cl bath, the effects of stretching in H
2SO
4 bath show more remarkably in decomposition of a xanthate filament in which there is yet no mechanical cohesion of all chains than in that of a cohesive xanthate.
(2) When gelatination takes place under stretching, the extending effect of stretching in NH
4Cl bath show more clearly at the stage in which a cohesive xanthate filament is formed by either prolonging the running time in the salt bath or by increasing the concentration of the salt, but the-effects of stretching in H
2SO
4 bath are small as described in the preceding section.
(3) As a rule, the effects of stretching are shown more markedly in the gelatinizing process than in the regenerating process of gelatinized xanthate.
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