Process for preparation of polyparaphenylene terephthalamide fibers

A process for the preparation of poly-p-phenylene terephthalamide fibers having improved mechanical properties at high spinning speeds according to the wet spinning method comprising passing an optically anisotropic solution of a poly-p-phenylene terephthalamide type polymer through a non-coagulating fluid layer and guiding the solution to a coagulating bath, characterized in that (a) filaments are taken out together with a steam of coagulating solution from a first fine tube or fine hole arranged in the lower portion of the coagulating bath and the filaments travel through a second fine tube or fine hole arranged below and spaced from said first fine tube or fine hole, wherein the first fine tube or fine hole arranged in the lower portion of the coagulating bath and the second fine tube or fine hole are arranged on the upper and lower ends, respectively, of an interal sealed chamber, and the pressure in the sealed chamber is reduced by an evacuating device to accelerate the stream of the coagulating solution flowing out together with the filaments through the first fine tube or fine hole arranged in the lower portion of the coagulaing bath and decrease the speed of the steam of the coagulating solution accompanying the filaments in the lower second fine tube or fine hole.