抄録
The cross section of polyvinyl alcohol (PVA) fiber obtained by wet spinning (Kanebian) shows the elongated dogbone shape, i.e. something like horseshoes form with skin and lumpy core structure of its inside. By adding small amount of boric acid (0.8% to PVA) to PVA solution wbich is to be spun in alkali coagulating bath, the cross-section of the fiber structure changed from the dogbone form to that of round shape and to all skin type. When alkali coagulating bath containes a borate, the cross section of the spinning fiber changes to a crenate form. This uniform fiber has superior mechanical properties with lust.
