Toray Industries, Inc.

Sumio Yamaguchi

Tamotsu Suzuki

Tsuyoshi Hayashi

Teruaki Saijo

Yasunori Kanemori

Sho Murata

Hirotaka Nakajima

Katsumi Sonoyama

Kazumasa Yamashita

A polyphenylene sulfide monofilament is characterized by having a continuous heat-shrinking stress variation of at most 5% and a size uniformity (U %, Normal value) of at most 1.2%; and a drum-shaped fiber package includes the wound polyphenylene sulfide monofilament described. The polyphenylene sulfide monofilament has a very small aperture variation rate and is optimal for high-precision filters.

Polyphenylene sulfide monofilament and manufacturing method therefor, and package

A method and apparatus for winding synthetic fibers is disclosed. According to the invention, a yarn is wound around a bobbin without winding a tail bunch, at a high successful bobbin-to-bobbin yarn transfer rate for a variety of yarn properties, i.e. different in thickness, lubricant used, etc., while inhibiting the loosening of the yarn tail into single fibers and stably and easily forming a proper yarn tail length. Tail bunch removing work is not required and the winding process is stabilized. A yarn is wound around an empty bobbin using a yarn winding apparatus composed of a traverse fulcrum guide, a traverse device, a contact pressure roller, two spindles, a moving device for moving the spindles, and a yarn transfer device for introducing the yarn into a yarn holding portion for holding the yarn. The yarn transfer device is composed of an upper yarn passage guide, a lower yarn passage guide, and a surface bunching guide respectively provided at positions upstream and downstream of the empty bobbin in the yarn running direction. The yarn is moved outside the traverse width, to be kept almost parallel to the yarn holding portion by the upper yarn passage guide and the lower yarn passage guide, pressed to the empty bobbin by at least either of the guides, moved to the yarn holding portion by at least either of the guides, and held and cut by the yarn holding portion the holding point of the yarn is allowed to move in the rotating direction of the empty bobbin reverse to the running direction of the yarn. The yarn is allowed to be automatically disengaged from the upper yarn guide, and is moved toward the center of the traverse without forming the initially straight-wound yarn tail bunch, and that when the yarn is engaged with the traverse guide, regular winding is started.

Take-up method and device for synthetic fiber and method of using thread package

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Nagoya, Japan

Sumio Yamaguchi