Method for producing composite fiber and composite spinneret

A method for producing a composite fiber, the method comprising:

• distributing a sea-component polymer and at least one other-component polymer different from the sea-component polymer by a distribution plate;
• discharging the sea-component polymer and the other-component polymer distributed by the distribution plate respectively from sea-component discharge holes and other-component discharge holes of a discharge plate positioned at a downstream side of the distribution plate with respect to a polymer spinning path direction, thereby forming at least one composite polymer;
• and
• discharging the composite polymer from a discharge hole of a spinneret discharge plate positioned at a downstream side of the discharge plate with respect to the polymer spinning path direction,
• wherein
• in a discharge face of the discharge plate, corresponding to the one composite polymer, there is at least one hole group in which a plurality of the sea-component discharge holes is located to surround one or a plurality of the other-component discharge holes, and
• in the one hole group, where a circle with a minimum diameter including all the other-component discharge holes thereinside is defined as an imaginary circle, an entire discharge amount Qout of the sea-component polymer discharged from all sea-component discharge holes located in a region outside the imaginary circle and an entire discharge amount Qin of the sea-component polymer discharged from all sea-component discharge holes located in a region inside the imaginary circle satisfy Qout/Qin≥0.5.