Title:
CELLULAR FIBER AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2007/072788
Kind Code:
A1
Abstract:
[PROBLEMS] To provide a high-quality cellular fiber having a small fiber fineness, having
no large air bubble therein, and is uniform in fiber diameter in the lengthwise direction.
[MEANS FOR SOLVING PROBLEMS] Disclosed is a cellular fiber comprising a thermoplastic
polymer and has an average fiber diameter of 1 to 50 μm inclusive, wherein
air bubbles constitute 10 to 90% inclusive of the cross-section of the fiber,
the ratio of the maximum diameter of an air bubble to the diameter of the fiber is
0.08 or less, and the fiber has a U% (half) of 2 or less. The cellular fiber can be
produced by: kneading a thermoplastic polymer and nitrogen and/or carbon dioxide
in a molten state to prepare a mixed polymer, introducing the mixed polymer to
a spinning die; applying a shear rate (γH) of 50,000 to 1,000,000 sec-1
to the mixed polymer at the spinning die; discharging the mixed polymer into a
low-pressure area to decrease the pressure of the mixed polymer, thereby causing
to foam the polymer; cooling the foamed polymer; drawing the polymer; and winding
the polymer.
Inventors:
FUKUDOME KOUSUKE (JP)
MIYAZONO KOUKI (JP)
MOCHIZUKI KATSUHIKO (JP)
MIYAZONO KOUKI (JP)
MOCHIZUKI KATSUHIKO (JP)
Application Number:
PCT/JP2006/325215
Publication Date:
June 28, 2007
Filing Date:
December 19, 2006
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
FUKUDOME KOUSUKE (JP)
MIYAZONO KOUKI (JP)
MOCHIZUKI KATSUHIKO (JP)
FUKUDOME KOUSUKE (JP)
MIYAZONO KOUKI (JP)
MOCHIZUKI KATSUHIKO (JP)
International Classes:
D01F6/00; D01D4/02; D01D5/247
Domestic Patent References:
| WO2000064657A1 | 2000-11-02 | |||
| WO2004035884A1 | 2004-04-29 |
Foreign References:
| US6846562B1 | 2005-01-25 | |||
| JP2006009167A | 2006-01-12 | |||
| JPH07126974A | 1995-05-16 |
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