Advertisement

Studies on high-speed melt spinning of noncircular cross- section fibers. I. Structural analysis of as-spun fibers

Authors

  • Wataru Takarada,

    1. Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, O-Okayama, Meguro-Ku, Tokyo 152-8552, Japan
    Search for more papers by this author
  • Hiroshi Ito,

    1. Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, O-Okayama, Meguro-Ku, Tokyo 152-8552, Japan
    Search for more papers by this author
  • Takeshi Kikutani,

    Corresponding author
    1. Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, O-Okayama, Meguro-Ku, Tokyo 152-8552, Japan
    • Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, O-Okayama, Meguro-Ku, Tokyo 152-8552, Japan
    Search for more papers by this author
  • Norimasa Okui

    1. Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, O-Okayama, Meguro-Ku, Tokyo 152-8552, Japan
    Search for more papers by this author

Abstract

Flat fibers and hollow fibers were prepared through the high-speed melt spinning of poly(ethylene terephthalate) (PET), and the structures of these fibers were compared with those of circular fibers. The cross-sectional shape of each fiber changed to a dull shape in comparison with that of the respective spinning nozzle. The change in the cross-sectional shape was slightly suppressed with an increase in the take-up velocity. There was a significant development of structural variation in the cross section of flat fibers in that the molecular orientation and crystallization were enhanced at the edge. Despite the difference in the cross-sectional shape, the structural development of flat, hollow, and circular fibers with increasing take-up velocity showed almost similar behavior. Considering that the tensile stress at the solidification point of the spin line is known to govern the structure development of high-speed spun PET fibers, it was speculated that the effects of the enhancement of cooling and air friction on the tensile stress at the solidification point cancel each other. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1575–1581, 2001

Ancillary