Provided is a strand extending in the longitudinal direction, wherein the strand includes filaments of one type having a gradient-length effect through spiral rotational twists and an irregular fine texture through self-thermal shrinking. The filaments of the strand have natural coiling characteristics that are very similar to those of natural hair of black people, and these characteristics are caused by the facts that the filaments have 3-dimensional waveforms occurred due to many fine and irregular windings or projections and that the waveforms exhibit fractal structure features and a fine kinky texture.

The present invention is to provide a fiber for artificial hair which can freely change the hairstyle at home while maintaining the wave shape of the fiber. A fiber for artificial hair having a bending rigidity maintaining ratio defined by formula (1) is 40 to 80% and a heat shrinkage ratio defined by formula (2) is 0.0 to 5.0% is provided.
bending rigidity maintaining ratio (%)=100{(bending rigidity in a state after conditioning for 24 hours at 30 C.90% RH)/(bending rigidity in a state after conditioning for 24 hours at 23 C.50% RH)}(1)
heat shrinkage ratio (%)=100{(length before heat treatment)(length after heat treatment for 5 min at 155 C.)}/(length before heat treatment)(2).

The present invention is to provide a fiber for artificial hair which can freely change the hairstyle at home while maintaining the wave shape of the fiber. A fiber for artificial hair having a bending rigidity maintaining ratio defined by formula (1) is 40 to 80% and a heat shrinkage ratio defined by formula (2) is 0.0 to 5.0% is provided.
bending rigidity maintaining ratio (%)=100{(bending rigidity in a state after conditioning for 24 hours at 30 C.90% RH)/(bending rigidity in a state after conditioning for 24 hours at 23 C.50% RH)}(1)
heat shrinkage ratio (%)=100{(length before heat treatment)(length after heat treatment for 5 min at 155 C.)}/(length before heat treatment)(2).

A method for positioning hairline contours with different head circumference sizes includes: determining a trichion, where the trichion is located at a center of a top of a forehead; determining a center point of a head, where the center point of the head is located on a surface of a skull top; determining a skull top U-shaped line based on the trichion and the center point of the head; determining frontal horn points based on the skull top U-shaped line and temporal bone lines of the head; determining front side points; determining sidebums points; determining ear points; determining neck side points; determining a skull base line; connecting, based on a trend of facial muscles, the trichion, the frontal horn points, the front side points, the sidebums points, the ear points, the neck side points and the skull base line in a smooth transition manner in, to obtain a hairline contour.

A method for positioning hairline contours with different head circumference sizes includes: determining a trichion, where the trichion is located at a center of a top of a forehead; determining a center point of a head, where the center point of the head is located on a surface of a skull top; determining a skull top U-shaped line based on the trichion and the center point of the head; determining frontal horn points based on the skull top U-shaped line and temporal bone lines of the head; determining front side points; determining sidebums points; determining ear points; determining neck side points; determining a skull base line; connecting, based on a trend of facial muscles, the trichion, the frontal horn points, the front side points, the sidebums points, the ear points, the neck side points and the skull base line in a smooth transition manner in, to obtain a hairline contour.

An exemplary wig grip apparatus includes a first securement member, a second securement member and a mesh element. The securement members are comprised of a flexible fabric. The mesh element is transparent and affixed to inboard portions of the securement elements. The outboard portions may be configured to be placed into releasable gripping engagement with one another by way of mutually-engageable complementary fastener elements. The securement members each include a forward edge and an opposing rearward edge. The mesh element may include a frontal segment having a forward periphery. The forward periphery is preferably in alignment with the forward edges. The mesh element may include a parting-line segment extending oppositely of the forward periphery. The width of the frontal segment may be greater than the corresponding width of the parting-line segment. Moreover, the parting-line segment may include a rearward periphery in alignment with the rearward edges.

Composition and production methods of artificial hair (11) with natural organic material, comprising a core (12), surrounded by a mantle (9), whereby the core comprises a strong fiber with one or more filaments (13) and whereby the mantle comprises one or more layers of shellac and liquefied hydrolysed human hair, combined with crosslinkers that are attached to the core that can be composed of natural fibroin fibers or of fibers of a high performance synthetic polymer.

Provided is a strand extending in the longitudinal direction, wherein the strand includes filaments of one type having a gradient-length effect through spiral rotational twists and an irregular fine texture through self-thermal shrinking. The filaments of the strand have natural coiling characteristics that are very similar to those of natural hair of black people, and these characteristics are caused by the facts that the filaments have 3-dimensional waveforms occurred due to many fine and irregular windings or projections and that the waveforms exhibit fractal structure features and a fine kinky texture.

Provided is an artificial hair fiber which can prevent detachment between core and sheath, having superior texture close to human hair, and having superior curl retention. An artificial hair fiber has a core-sheath structure, including: a core; and a sheath covering the core; and: the core includes a core resin composition including polyester; the sheath includes a sheath resin composition including polyamide; the core and the sheath have a core/sheath mass ratio of 40/60 to 90/10; and when a melt viscosity of the polyester of the core is expressed as a, and a melt viscosity of the polyamide of the sheath is expressed as b, a viscosity ratio a/b is 0.5 to 2.5.

An artificial hair apparatus comprises a mesh layer configured to fit around a circumference of a user's head comprising a center member, a first side member, a second side member, a front region and a rear region, wherein the first side member is disposed on an opposite side of the center member than the second side member and a band member configured to fit around a circumference of a user's head, wherein the band member is coupled to the center member, the first side member and the second side member.