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US-12622477-B2 - Hair extension

US12622477B2US 12622477 B2US12622477 B2US 12622477B2US-12622477-B2

Abstract

Problem Provided is a practical hair extension configured to be very easily attached to head hair (natural hair) and attachment of which on the head hair is less likely to be noticed by other people. Solution A hair extension 1 includes a hair bundle 2 , a double-sided adhesive tape 3 , and a release paper 4 . The hair bundle 2 has a base end including a first hair layer L 1 formed by laterally aligning a plurality of hairs h 1 , h 1 . . . such that base end edges of the plurality of hairs are linearly arranged and bonding vicinities of the base ends of the hairs h 1 , h 1 with an adhesive so as to have a constant adhesive width, and a second hair layer L 2 formed by laminating a plurality of hairs h 2 , h 2 . . . to be laterally aligned on an upper side of the first hair layer L 1 such that base end edges of the plurality of hairs are linearly arranged and bonding vicinities of the base ends of the hairs h 2 , h 2 . . . with an adhesive so as to have an adhesive width narrower than the adhesive width of the first hair layer L 1 . Furthermore, the double-sided adhesive tape 3 is stuck to the first hair layer L 1 .

Inventors

  • Ryuki HIRANO

Assignees

  • Ryuki HIRANO

Dates

Publication Date
20260512
Application Date
20200722
Priority Date
20200121

Claims (10)

  1. 1 . A hair extension comprising: a hair bundle composed with a first hair bundle and a second hair bundle that are a plurality of hairs, a base end that is fixed to a proximal end of the hair bundle; and a double-sided adhesive tape that is stuck to the base end and is configured to attach the hair bundle to natural hairs of a user, wherein the base end of the hair bundle includes: a first base that is a mass of cured resin and has a thin layer shape such that a proximal end of the first hair bundle is retained inside the first base and the hairs of the first hair bundle extend from the first base in a vertical direction and align in a horizontal direction, which is perpendicular to the vertical direction, wherein the first base has a predetermined length in the vertical direction and a predetermined thickness in a thickness direction, which is perpendicular to both the vertical direction and the horizontal direction, and the first base has two surfaces facing in opposite directions to each other, and the double-sided adhesive tape is attached to one of the surfaces of the first base, a second base that is a mass of cured resin and has a thin layer shape such that a proximal end of the second hair bundle is retained inside the second base, and the hairs of the second hair bundle extend from the second base in the vertical direction and align in the horizontal direction wherein the second base has a predetermined length in the vertical direction and a predetermined thickness in the thickness direction, wherein the second base is placed on the other of the surfaces of the first base, which is opposite from the double-sided adhesive tape, the first base and the second base are both made of polyurethane-based resin, the thicknesses of the first base and the second base are constant in the vertical direction and are each ranged from 0.05 mm to 0.4 mm, and the thickness of the second base is smaller than the thickness of the first base, the length of the second base is shorter than the length of the first base, and upper edges of the first base, the second base, and the double-sided adhesive tape in the vertical direction are aligned flush, forming an upper edge of the base end.
  2. 2 . The hair extension according to claim 1 , wherein cutouts are formed at the upper edge of the base end at predetermined intervals in the horizontal direction, and each of the cutouts has a slit that extends away from the upper edge of the base end in the vertical direction such that the slits are arranged in parallel at predetermined intervals in the horizontal direction.
  3. 3 . The hair extension according to claim 2 , wherein the double-sided adhesive tape is formed of polyester-based resin, each of the cutouts has an isosceles triangle shape of which a base is located at the upper edge of the base end and an apex is directed away from the upper edge of the base end in the vertical direction, the slit that corresponds to each of the cutouts extends from the apex of the triangle shape, and a width of the base of the triangle shape in the horizontal direction is approximately the same as a length of the slits in the vertical direction.
  4. 4 . The hair extension according to claim 3 , wherein each of the cutouts has a triangle shape.
  5. 5 . The hair extension according to claim 4 , wherein the thicknesses of the first base and the second base are each ranged from 0.2 mm to 0.4 mm.
  6. 6 . The hair extension according to claim 4 , wherein the proximal end of the first hair bundle is located at the upper edge of the first base, and the first hair bundle penetrates the first base in the vertical direction, and the proximal end of the second hair bundle is located at the upper edge of the second base, and the second hair bundle penetrates the second base in the vertical direction.
  7. 7 . The hair extension according to claim 3 , wherein the thicknesses of the first base and the second base are each ranged from 0.2 mm to 0.4 mm.
  8. 8 . The hair extension according to claim 7 , wherein the proximal end of the first hair bundle is located at the upper edge of the first base, and the first hair bundle penetrates the first base in the vertical direction, and the proximal end of the second hair bundle is located at the upper edge of the second base, and the second hair bundle penetrates the second base in the vertical direction.
  9. 9 . The hair extension according to claim 3 , wherein the proximal end of the first hair bundle is located at the upper edge of the first base, and the first hair bundle penetrates the first base in the vertical direction, and the proximal end of the second hair bundle is located at the upper edge of the second base, and the second hair bundle penetrates the second base in the vertical direction.
  10. 10 . The hair extension according to claim 1 , wherein the proximal end of the first hair bundle is located at the upper edge of the first base, and the first hair bundle penetrates the first base in the vertical direction, and the proximal end of the second hair bundle is located at the upper edge of the second base, and the second hair bundle penetrates the second base in the vertical direction.

Description

TECHNICAL FIELD The present invention relates to a hair extension (hairpiece) attached to natural hair for a purpose such as giving a voluminous look to the head hair. BACKGROUND ART As a conventional hair extension, there has been known a hair extension in which a metal tube is disposed to a base end of a hair bundle to be attached, and the hair extension is attached to natural hair by crushing the tube in a state where the natural hair is internally inserted through the metal tube. There has been developed a hair extension in which an outside of a cylindrical body including a hair bundle immersed in an adhesive is coated with a heat shrinkable tube, and the heat shrinkable tube is heated by an iron and the like in a state where natural hair is internally inserted through the cylindrical body, thereby attaching the hair extension to the natural hair with the shrunk tube and the melted adhesive (Patent Document 1). Furthermore, recently, for easier attaching to the head hair in a shorter time, there has been developed a hair extension of a type of being adhered to natural hair using a double-sided adhesive tape (that is, hair is adhered to one surface of the double-sided adhesive tape, and the other surface of the double-sided adhesive tape is adhered to the natural hair) (Patent Document 2). Patent Document 1: Japanese Unexamined Patent Application Publication No. 2008-202199Patent Document 2: Japanese Registered Utility Model No. 3198852 DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, while the hair extension of the type of being adhered to the natural hair using the double-sided adhesive tape as Patent Document 2 can be very easily attached to head hair (natural hair), there is a problem in that wearing it on the head hair is instantly noticed by other people because the double-sided adhesive tape is seen from a gap in the adhered hair. There is also a problem in that the natural hair is bonded to the double-sided adhesive tape from the gap in the adhered hair. The present invention has an object to solve the above-described problems of the conventional hair extensions and provide a practical hair extension that can be very easily attached to head hair (natural hair) and attachment of which on the head hair is less likely to be noticed by other people. Solutions to the Problems In the present invention, the invention described in claim 1 is a hair extension that includes a hair bundle having a base end and a double-sided adhesive tape stuck to the base end for attaching the hair bundle to natural hairs. The base end of the hair bundle includes a first hair layer formed by laterally aligning a plurality of hairs such that base end edges of the plurality of hairs are linearly arranged and bonding vicinities of the base ends of the hairs with an adhesive so as to have a constant adhesive width, and a second hair layer formed by laminating a plurality of hairs to be laterally aligned on an upper side of the first hair layer such that base end edges of the plurality of hairs are linearly arranged and bonding vicinities of the base ends of the hairs with an adhesive so as to have an adhesive width narrower than the adhesive width of the first hair layer. The double-sided adhesive tape is stuck to the first hair layer. According to the invention described in claim 2, in the invention described in claim 1, the first hair layer and the second hair layer are formed to have constant thicknesses (or approximately constant thicknesses). According to the invention described in claim 3, in the invention described in claim 1 or claim 2, the thicknesses of the first hair layer and the second hair layer are each adjusted to 0.05 mm or more and 0.4 mm or less, and the thickness of the second hair layer is equal to or less than the thickness of the first hair layer. According to the invention described in claim 4, in the invention described in any one of claims 1 to 3, slits are provided in parallel at predetermined intervals at an outer end edge of the double-sided adhesive tape. Effects of the Invention The hair extension according to claim 1 can be very easily attached to the head hair in a very short period using the double-sided adhesive tape (adhering means). Furthermore, since the base end of the hair bundle to which the double-sided adhesive tape is stuck is formed by laminating the second hair layer formed by bonding a plurality of hairs with a narrow width (narrow width along a longitudinal direction of the hair) on the first hair layer formed by bonding a plurality of hairs with a wide width (wide width along the longitudinal direction of the hair) (that is, since the first hair layer is covered with the second hair layer in which the bonding portion is less likely to be noticeable), the double-sided adhesive tape is less likely to be seen from the outside of the base end of the hair bundle, and therefore, its attachment is less likely to be noticed by other people. Additionally, a cas