| 摘要 |
<p>Provided is a composite spinneret for discharging a composite polymer stream composed of an island component polymer and a sea component polymer, including one or more distribution plates in which distribution holes and distribution grooves for distributing the polymer components are formed; and a lowermost layer distribution plate positioned to the downstream side of the distribution plate in the direction of the polymer spinning path and provided with a plurality of island component discharge holes and a plurality of sea component discharge holes, wherein the composite spinneret has a plurality of hole groups composed of n island component discharge holes centered on a center O and arranged on a circular line C1 with a radius R1, n sea component discharge holes centered on the center O and arranged on a circular line C2 with a radius R2, n group centers P centered on the center O and arranged on a circular line C3 with a radius R3, n island component discharge holes centered on the group center P and arranged on a circular line C5 with a radius R1, and n sea component discharge holes centered on the P and arranged on a circular line C6 with a radius R2 are present; and R1, R2 and R3 satisfy the following expression (1) and (2):
(1) R �¢ 1 ‰¤ R �¢ 2 €¢ cos 180 / n degree
(2) R �¢ 3 = 2 €¢ R �¢ 2 and each discharge hole is arranged according to predetermined conditions.</p> |
