Method For Manufacturing Bicomponent Fiber, And Bicomponent Spinneret

Abstract: Provided is a method for manufacturing a bicomponent fiber wherein, in accordance with a desired shape, an another-component polymer is supplied and an appropriate amount of another sea-component polymer is supplied to the outer peripheral side of a bicomponent fiber to form a bicomponent polymer flow, thereby to form various fiber cross-sectional configurations with high accuracy and to provide a bicomponent fiber in which a high dimensional stability of the cross-sectional configurations can be maintained. In the method, a sea-component polymer and at least one kind of another-component polymer different from the sea-component polymer are distributed by means of a distribution plate (3), the sea-component polymer and the another-component polymer that have been distributed by means of the distribution plate (3) are respectively discharged from a sea-component discharge hole (2) and an another-component discharge hole (1) of a discharge plate (4) which is disposed downstream of the distribution plate (3) with respect to a polymer spinning path direction, to form at least one bicomponent polymer, and the bicomponent polymer is discharged from a discharge hole (16) of a spinneret discharge plate (5) which is disposed downstream of the discharge plate (4) with respect to the polymer spinning path direction. A discharge surface (23) of the discharge plate (4) has at least one hole group in which a plurality of the sea-component discharge holes (2) are disposed around one or a plurality of the another-component discharge holes (1) in correspondence to the one bicomponent polymer. In the one hole group, if a circle of a minimum diameter that includes all of the another-component discharge holes (1) on the inside thereof is a virtual circle (14), a total discharge amount Qout of the sea-component polymer that is discharged from all of the sea-component discharge holes (2) disposed in the region outside the virtual circle (14) and a total discharge amount Qin of the sea-component polymer that is discharged from all of the sea-component discharge holes (2) disposed in the region inside the virtual circle (14) satisfy Qout/Qin=0.5.

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