Abstract: An acrylic fiber for artificial hair includes an acrylic copolymer obtained by copolymerizing acrylonitrile, vinyl chloride and/or vinylidene chloride, and a sulfonic acid group-containing vinyl monomer; and an organic solvent that can dissolve the acrylic copolymer, where the organic solvent is present in an amount of 0.1 to 3% by mass with respect to the total mass of the acrylic fiber for artificial hair. The acrylic fiber for artificial hair has an average surface roughness of 5900 ?m2 or less in an area of 40 ?m long and 80 ?m wide of the side surface of the fiber.

Abstract: A method for manufacturing an acrylic fiber uses a spinning solution in which an acrylic polymer is dissolved in an organic solvent, the method including reducing an amount of organic solvent by repeatedly spraying water onto coagulated filaments obtained by solidifying the spinning solution and pressing the coagulated filaments with nip rolls. The nip rolls may apply a nip pressure of 0.2 MPa or higher. Thus, a method for manufacturing an acrylic fiber with which an organic solvent in the acrylic fiber can be removed within a short period of time without using a water bath is provided.

Abstract: An acrylic fiber is composed of an acrylic polymer. The acrylic polymer includes acrylonitrile, wherein the acrylic fiber has a deformation degree of 0.13 or less and a surface roughness of 6000 ?m2 or less. A method for producing an acrylic fiber by wet spinning or dry-wet spinning includes: dissolving an acrylic polymer in an organic solvent to form a spinning solution, the acrylic polymer including acrylonitrile; discharging the spinning solution into a coagulation bath to form an acrylic fiber; water washing the acrylic fiber; and drying the acrylic fiber, wherein, before drying the acrylic fiber, the acrylic fiber is pressed with a nip roll and subjected to pre-drying using a dryer into which steam is fed.

Abstract: An acrylic fiber for artificial hair includes an acrylic copolymer obtained by copolymerizing acrylonitrile, vinyl chloride and/or vinylidene chloride, and a sulfonic acid group-containing vinyl monomer; and an organic solvent that can dissolve the acrylic copolymer, where the organic solvent is present in an amount of 0.1 to 3% by mass with respect to the total mass of the acrylic fiber for artificial hair. The acrylic fiber for artificial hair has an average surface roughness of 5900 ?m2 or less in an area of 40 ?m long and 80 ?m wide of the side surface of the fiber.

Abstract: A method for manufacturing an acrylic fiber uses a spinning solution in which an acrylic polymer is dissolved in an organic solvent, the method including reducing an amount of organic solvent by repeatedly spraying water onto coagulated filaments obtained by solidifying the spinning solution and pressing the coagulated filaments with nip rolls. The nip rolls may apply a nip pressure of 0.2 MPa or higher. Thus, a method for manufacturing an acrylic fiber with which an organic solvent in the acrylic fiber can be removed within a short period of time without using a water bath is provided.