Modified cross-section (異形 斷面) preparation of acrylic fibers

摘要

Acrylic fibers, having non-circular cross sections of which the deg. of flatness is more than 1.5, are produced by a combination of (1) prepg. an acrylonitrile polymer spinning soln. of 40 - 70C having a viscosity of 40-200 poises at 30C; (2) wetspinning the spinning soln. through a spinnerette having circular spinning orifices and holdng it in a first coagulating bath; (3) holding the coagulated gel filaments in a second coagulating bath; and (4) washing the coagulated gel filaments with water and wetheat stretching the filaments 4 times in length at above 80C.