Stretch-processed yarn, fiber product, composite spinneret, and composite fiber production method

A stretch yarn comprising a multifilament including fibers having a coiled crimping form in a fiber axial direction, wherein a coil diameter distribution of crimping in the fiber has two or more groups, a ratio of a maximum group average value to a minimum group average value of the coil diameter (a maximum group average value/a minimum group average value) is less than 3.00, and a cross section of the fibers constituting the multifilament is an eccentric core-sheath cross section.

A composite spinneret that discharges a composite polymer flow constituted of a first component polymer and a second component polymer,

• wherein the composite spinneret comprises a measurement plate having a plurality of measurement holes for measuring each polymer component, one or more distribution plates having distribution holes for distributing each polymer component, and a discharge plate,
• in a lowermost layer on a downstream side of the distribution plate in a polymer spinning path direction, a polymer distribution hole group in which a plurality of first component polymer distribution holes of semicircular arrangement are surrounded by a plurality of second component polymer distribution holes is bored, and
• at least a part of the second component polymer distribution holes in the polymer distribution hole group is arranged in semicircular arc arrangement on an outer side of a circumferential portion of the plurality of first component polymer distribution holes of semicircular arrangement.