Production method of wet spinning die and acrylic-based carbon fiber precursor fiber bundle or carbon fiber

摘要

PROBLEM TO BE SOLVED: To provide a wet spinning spinneret capable of stably producing an acrylic precursor fiber bundle suitable for producing high-strength carbon fiber, through improved unevenness in structure or cross-section between single filaments, and to provide a method for producing the precursor fiber bundle for the acrylic carbon fiber using the same.;SOLUTION: The wet spinning spinneret used for wet spinning of synthetic fiber with 3,000-16,000 nozzle holes, includes the following structure: the nozzle group is divided and disposed into a plurality of larger nozzle block groups through first division zones; and further, each of the larger blocks is divided into a plurality of smaller blocks through second division zones narrower in the first division zones; wherein the narrowest portion of the first division zones has a width of 5-15 mm. The method for producing the precursor fiber bundle for the acrylic carbon fiber using the wet spinning spinneret is also provided.;COPYRIGHT: (C)2010,JPO&INPIT