| 摘要 |
PROBLEM TO BE SOLVED: To provide a spinneret which can stably produce a highly hollow yarn comprising 36 or more filaments. SOLUTION: This spinneret is the one in which spinning nozzle (2) groups for spinning a multifilament yarn comprising hollow single filaments are formed and which simultaneously satisfies the following requirements (A) to (D). (A) Each spinning nozzle has at least a polymer-introducing hole formed on the upstream side and a discontinuous polymer flow pass formed on the downstream side. (B) In the spinning nozzle, three or more circular slit flow passes are arranged on the circumference in a row to form a wholly discontinuous circular polymer flow pass. (C) (a) and (b) have a relation: (b)≥3.1(a), wherein (a) is the diameter of a virtual inscribed circle inscribing in the peripheral edge of the circular polymer flow pass, and (b) is a distance between the centers of the mutually adjacent spinning nozzles. (D) When the spinning nozzle groups are arranged on lattice points, a distance between the lattice points has at least the relation of (C). COPYRIGHT: (C)2004,JPO
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