To provide a spinneret pack for melt-spinning effective for suppressing the variation of fineness of the spun fibers.
The spinneret pack for melt-spinning has an upper face 10 formed in a conical form, a lower face 11 formed of a center-side conical counterbore 11a and a circumference-side semiconical protrusion 11b and contains a distribution plate 5 having a polymer passing hole 9 at the center. The pack satisfies the following formulas (1) to (3): 60≤(D02-D12)/d2≤250 (1), 1.0≤S2/S1≤2.5 (2): and 0.51≤D12/D02≤0.95 (3) wherein D0 is the maximum inner diameter of the polymer path in the pack body, D1 is the outer diameter of the distribution plate, d is the diameter of the polymer passing hole, S1 is the specific surface area of the inner face of the polymer passing hole, and S2 is the specific surface area of the polymer path between the lower face of the upper lid and the upper face of the distribution plate.
MIZUHASHI MOTOI
KIRYU SEIJI
Takashi Noguchi
Kazuhiko Saishita
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