Kaneka Corporation

Norikazu Yasutomo

Hiroshi Fujinaga

Genta Sakamoto

Takashi Ogino

The present disclosure relates to a core-sheath conjugate fiber for artificial hair including a core part and a sheath part. The core-sheath conjugate fiber for artificial hair has a flat multilobed cross sectional shape, and has a core-to-sheath area ratio of 2:8 to 9:1, and a viscosity ratio a/b between a melt viscosity a of a core part resin composition and a melt viscosity b of a sheath part resin composition is 2.0 or more and 7.0 or less. The present disclosure provides a core-sheath conjugate fiber for artificial hair having a touch close to that of human hair, excellent peel resistance at room temperature, and good combing property, a hair ornament product including the core sheath conjugate fiber, and a production method.

Core-sheath composite fiber for artificial hair, headdress product including same, and production method therefor

The present disclosure relates to a core-sheath conjugate fiber for artificial hair including a core part and a sheath part, wherein the core-sheath conjugate fiber for artificial hair is a colored fiber, a color difference between the core-sheath conjugate fiber for artificial hair and the core part is 3.0 or more, and a color difference between the core-sheath conjugate fiber for artificial hair and the sheath part is also 3.0 or more. Provided are a core-sheath conjugate fiber for artificial hair capable of realizing deep colors and having a good appearance close to that of human hair, a hair ornament product including the core-sheath conjugate fiber, and a production method.

A method for producing a stretched film comprising a first step of stretching a long film by increasing a holding distance in the width direction and a second step of shrinking by decreasing the holding distance in the width direction. One side edge of the long film has a traveling direction with at least three bending travels, while the other side edge has a traveling direction with at least two bending travels. The first step or the second step performs the bending travel at one or both of the side edges. The first step or the second step has a traveling trajectory in which the both side edges of the long film travel to the same side. The method achieves suppression of wrinkles formed on the stretched film, limitation of biaxiality of the stretched film, and provides a stretched film having optical properties suitably usable as a retardation plate.

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Otsu, Japan

Norikazu Yasutomo