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.

An artificial hair spinning nozzle includes a nozzle body having a spinning hole extending into the nozzle body. In a cross-sectional view, the spinning hole includes a core section formed at the center of the nozzle body, and three branch sections each formed to radially protrude in an arc shape from the core section at a predetermined angle. The arc shape is bent along one direction to form an outer contour of the spun artificial hair. The branch section includes a convex circular part protruding in a convex circular shape on the end side of the branch section, and a concave circular part recessed between adjacent branch sections in a concave circular sectional shape circumscribed to circles of the convex circular part and the core section.

A fiber for artificial hair formed of a polyvinyl chloride-based resin composition. The fiber for artificial hair has a value X1 of a loss tangent tans at 70° C. of 0.06 or more and 0.12 or less, when dynamic viscoelasticity is measured under the following conditions, and has a peak in a temperature range of 90° C. or higher and 110° C. or lower. (Dynamic viscoelasticity measurement conditions)The measurement is performed by sandwiching a bundle of 40 fibers for artificial hair that are arranged at a heating rate of 4° C./min and a frequency of 1 Hz.

A fiber for artificial hair formed of a polyvinyl chloride-based resin composition. The fiber for artificial hair has a value X1 of a loss tangent tans at 70° C. of 0.06 or more and 0.12 or less, when dynamic viscoelasticity is measured under the following conditions, and has a peak in a temperature range of 90° C. or higher and 110° C. or lower. (Dynamic viscoelasticity measurement conditions)The measurement is performed by sandwiching a bundle of 40 fibers for artificial hair that are arranged at a heating rate of 4° C./min and a frequency of 1 Hz.

To provide a reversibly thermochromic composite fiber having a reversible color change due to a temperature change, having such excellent flame retardancy that flame is hard to spread even if ignition occurs once, and having high safety.

[Solution] Disclosed is a sheath-core type reversibly thermochromic composite fiber including a core comprising a resin, a reversibly thermochromic pigment, and a flame retardant, and a sheath comprising a resin and a flame retardant.

A fiber for artificial hair, having a base fiber, a cationic polymer, a cationic surfactant, and a nonionic surfactant, in which the cationic polymer, the cationic surfactant, and the nonionic surfactant are present in at least a part of a surface of the base fiber, the cationic polymer has, as a monomer unit, a monomer having at least one selected from the group consisting of a primary amino group, a secondary amino group, a tertiary amino group, acid-neutralized groups of these groups, and a quaternary ammonium group, the cationic surfactant has a carbon chain having 12 to 22 carbon atoms, the nonionic surfactant has a carbon chain having 10 to 20 carbon atoms, an HLB value of the nonionic surfactant is 13.0 or more, and a content of the cationic polymer is 0.005% by mass or more based on a total amount of the fiber for artificial hair.

A fiber for artificial hair, having a base fiber, a cationic polymer, a cationic surfactant, and a nonionic surfactant, in which the cationic polymer, the cationic surfactant, and the nonionic surfactant are present in at least a part of a surface of the base fiber, the cationic polymer has, as a monomer unit, a monomer having at least one selected from the group consisting of a primary amino group, a secondary amino group, a tertiary amino group, acid-neutralized groups of these groups, and a quaternary ammonium group, the cationic surfactant has a carbon chain having 12 to 22 carbon atoms, the nonionic surfactant has a carbon chain having 10 to 20 carbon atoms, an HLB value of the nonionic surfactant is 13.0 or more, and a content of the cationic polymer is 0.005% by mass or more based on a total amount of the fiber for artificial hair.

A system for the viewing and selection of hair products includes a processor configured to obtain customer identification information characterizing one or more characteristics of a customer and to obtain customer measurement information characterizing one or more physical measurements of the customer. The processor also obtains selected product information characterizing a selected hair product of the customer and sends finalized order information regarding the selected hair product.

A system for the viewing and selection of hair products includes a processor configured to obtain customer identification information characterizing one or more characteristics of a customer and to obtain customer measurement information characterizing one or more physical measurements of the customer. The processor also obtains selected product information characterizing a selected hair product of the customer and sends finalized order information regarding the selected hair product.

A fiber for artificial hair, having a base fiber and a metal salt of a polymer compound that is present in at least a part of a surface of the base fiber, in which the metal salt contains at least one metal selected from the group consisting of silver, zinc, and copper. A headdress article having the fiber for artificial hair.