A core-sheath conjugate fiber for artificial hair including a core part and a sheath part is provide. The core part includes a polyester-based resin composition that contains a polyester-based resin and the sheath part is comprised of a polyamide-based resin composition that contains a polyamide-based resin. The core-sheath conjugate fiber for artificial hair has a single fiber fineness of 20 dtex or more and 80 dtex or less and a coefficient of variation of the single fiber diameter of 10% or more and 40% or less. With this configuration, a core-sheath conjugate fiber for artificial hair that has a touch close to that of human hair and a good gloss, a hair ornament product including the same, and a method for producing the same are provided.

A core-sheath conjugate fiber for artificial hair including a core part and a sheath part is provide. The core part includes a polyester-based resin composition that contains a polyester-based resin and the sheath part is comprised of a polyamide-based resin composition that contains a polyamide-based resin. The core-sheath conjugate fiber for artificial hair has a single fiber fineness of 20 dtex or more and 80 dtex or less and a coefficient of variation of the single fiber diameter of 10% or more and 40% or less. With this configuration, a core-sheath conjugate fiber for artificial hair that has a touch close to that of human hair and a good gloss, a hair ornament product including the same, and a method for producing the same are provided.

A core-sheath conjugate fiber for artificial hair including a core part and a sheath part is provided. The core part contains a polyester-based resin composition containing a polyester-based resin, and the sheath part contains a polyamide-based resin composition containing a polyamide-based resin. The core-sheath conjugate fiber for artificial hair has a core-to-sheath area ratio of core:sheath=2:8 to 8:2 and includes a hollow part, and the area of the hollow part constitutes 7% or more and 40% or less of the area of a fiber cross section. A core-sheath conjugate fiber for artificial hair that has a touch close to that of human hair and good voluminousness and curl setting property, and a hair ornament product including the same, and a method for producing the same are provided.

A core-sheath conjugate fiber for artificial hair including a core part and a sheath part is provided. The core part contains a polyester-based resin composition containing a polyester-based resin, and the sheath part contains a polyamide-based resin composition containing a polyamide-based resin. The core-sheath conjugate fiber for artificial hair has a core-to-sheath area ratio of core:sheath=2:8 to 8:2 and includes a hollow part, and the area of the hollow part constitutes 7% or more and 40% or less of the area of a fiber cross section. A core-sheath conjugate fiber for artificial hair that has a touch close to that of human hair and good voluminousness and curl setting property, and a hair ornament product including the same, and a method for producing the same are provided.

A core-sheath conjugate fiber for artificial hair includes a core part and a sheath part. The core-sheath conjugate fiber for artificial hair has a flat two-lobed cross sectional shape or an elliptical cross sectional shape, and has a core-to-sheath area ratio of core:sheath=3:7 to 8:2 in a fiber cross section. The sheath part contains a polyamide-based resin composition containing a polyamide-based resin. The core part has a modified flat two-lobed cross sectional shape or a modified elliptical cross sectional shape including a pair of protrusions protruding from the center side toward the outer circumferential side along a minor axis direction of the fiber cross section. A core-sheath conjugate fiber for artificial hair having a touch close to that of human hair, an excellent combing property, and a good curl setting property, a hair ornament product including the same, and a method for producing the same are provided.

A preparation method of fibers for medical antibacterial fabric includes cooling an antibacterial polyester melt by ring-blowing after extruded from a trilobal spinneret hole on a spinneret, and manufacturing a fully drawn yarn (FDY), then performing a relaxation heat treatment to obtain the fiber. The shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein all the trilobal spinneret holes are distributed in concentric circles, and the direction of the shortest leaf in each trilobal spinneret hole is randomly distributed. The prepared fiber has a three-dimensional crimp shape and includes antibacterial polyester monofilaments with trilobal cross-section. The fiber has mechanical performance indices as a crimp shrinkage of 26-29%, a crimp stability of 78-82%, a shrinkage elongation of 55-62%, a crimp elastic recovery rate of 70-75%, a breaking strength of 2.4-2.6 cN/dtex, an elongation at break of 55.0±5.0%, and a monofilament fineness of 1.00-1.50 dtex.

A preparation method of fibers for medical antibacterial fabric includes cooling an antibacterial polyester melt by ring-blowing after extruded from a trilobal spinneret hole on a spinneret, and manufacturing a fully drawn yarn (FDY), then performing a relaxation heat treatment to obtain the fiber. The shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein all the trilobal spinneret holes are distributed in concentric circles, and the direction of the shortest leaf in each trilobal spinneret hole is randomly distributed. The prepared fiber has a three-dimensional crimp shape and includes antibacterial polyester monofilaments with trilobal cross-section. The fiber has mechanical performance indices as a crimp shrinkage of 26-29%, a crimp stability of 78-82%, a shrinkage elongation of 55-62%, a crimp elastic recovery rate of 70-75%, a breaking strength of 2.4-2.6 cN/dtex, an elongation at break of 55.0±5.0%, and a monofilament fineness of 1.00-1.50 dtex.

A method of forming a color-changing fiber that can be incorporated into fabrics and other woven materials. The color changing fibers include an annular wall and a conductive wire axially extending through the annular wall, a core strand surrounded by the annular wall and extending axially through a central portion of the fiber, and an encapsulated electro-optic medium disposed on a surface of the core strand.

A degradable polyester fiber and its preparation method are disclosed. The preparation method is to cool a PET melt dispersing with doped ZrO.sub.2 powder by ring-blowing after extruded from a trilobal spinneret hole on a spinneret, and manufacture a fully drawn yarn (FDY) according to an FDY process with the PET melt, then the degradable polyester fiber is prepared after a relaxation heat treatment. The trilobal spinneret hole on the spinneret has three leaves with unequal lengths and angles, and all the trilobal spinneret holes are distributed in concentric circles, with a center line of the leaf opposite to the smallest angle in each trilobal spinneret hole passing through the center of the circle, and pointing away from the center of the circle. The process is simple, and the obtain fiber has good performances in degradation and elasticity.

A sheath-core composite fiber is composed of two or more polymers, wherein a core component having a multifoliate shape with three or more projections is completely covered by a sheath component in a fiber cross-section of the sheath-core composite fiber, while having a ratio of the maximum thickness Smax of the sheath component to the minimum thickness Smin of the sheath component, namely Smax/Smin of 5.0 or more. A multifilament is composed of the core component of this sheath-core composite fiber. The sheath-core composite fiber and multifilament are suitable for the achievement of a good textile that is comparable to natural silk.