Hair extension and process for the same

Abstract

A hair extension is disclosed, which can be used repeatedly and has extension hairs that is rarely lost and easy to be attached to and detached from. The hair extension includes a extension hair portion having a plurality of extension hairs and a binding portion for tying one ends of the extension hairs, and the binding portion includes a sheet binding portion for fixing the one ends integrally by melt-and-gluing two synthetic resin sheets with the one ends in-between.

1 . A hair extension comprising a extension hair portion including a plurality of strands of extension hairs and a binding portion for tying one ends of the extension hairs into one, wherein the binding portion comprises a sheet binding portion in which two sheets of synthetic resin overlapped with the one ends in-between are molten and glued so as to fix the one ends into one body. 
     
     
         2 . The hair extension of  claim 1 , wherein the synthetic resin sheet is a polyurethane sheet. 
     
     
         3 . The hair extension of  claim 1 , wherein the extension hair portion comprises a first sub-extension hair portion and a second sub-extension hair portion disposed in layers together with the first sub-extension hair portion, and wherein the sheet binding portion is formed by melting and gluing with neighboring ones a first polyurethane sheet disposed at an outer side of the first sub-extension hair portion opposite to the second sub-extension hair portion, a second polyurethane sheet disposed between the first and second sub-extension hair portions, and a third polyurethane sheet disposed at an outer side of the second sub-extension hair portion opposite to the first sub-extension hair portion. 
     
     
         4 . The hair extension of  claim 1 , wherein the extension hair portion comprises a first sub-extension hair portion, a second sub-extension hair portion disposed in layers together with the first sub-extension hair portion, a third sub-extension hair portion disposed in layers on the second sub-extension hair portion opposite to the first sub-extension hair portion, and the sheet binding portion is formed by melting and gluing with neighboring ones a first polyurethane sheet disposed at an outer side of the first sub-extension hair portion opposite to the second sub-extension hair portion, a second polyurethane sheet disposed between the first and second sub-extension hair portions, a third polyurethane sheet disposed between the second and third sub-extension hair portions, and a fourth polyurethane sheet disposed at an outer side of the third sub-extension hair portion opposite to the second sub-extension hair portion. 
     
     
         5 . The hair extension of  claim 1 , wherein the synthetic resin is a polyurethane sheet with thickness of 0.06˜0.1 mm. 
     
     
         6 . The hair extension of  claim 1 , wherein the extension hairs of the extension hair portion are disposed in a plane. 
     
     
         7 . The hair extension of  claim 4 , wherein in each of the first through third sub-extension hair portions, the extension hairs are disposed in a plane and there are 1 to 5 strands in the direction of thickness. 
     
     
         8 . The hair extension of  claim 1 , wherein in the sheet binding portion are formed holes with intervals. 
     
     
         9 . The hair extension of  claim 2 , wherein in the sheet binding portion are formed holes with intervals. 
     
     
         10 . The hair extension of  claim 3 , wherein in the sheet binding portion are formed holes with intervals. 
     
     
         11 . The hair extension of  claim 4 , wherein in the sheet binding portion are formed holes with intervals. 
     
     
         12 . A process for manufacturing a hair extension, the process comprising:
 a first step for disposing two synthetic resin sheets in layers with one end of a first sub-extension hair portion in-between; and   a first step for melt-and-gluing the one end of the first sub-extension hair portion between the two synthetic resin sheets by melt-and-gluing the two synthetic resin sheets while pressing the two synthetic resin sheets toward each other.   
     
     
         13 . The process of  claim 12 , wherein the synthetic resin sheet is a polyurethane sheet, and further comprising:
 a second step for disposing additional polyurethane sheet on a portion in which a second sub-extension hair portion is stacked in layers on the first sub-extension hair portion and one end of the second sub-extension hair portion is overlapped on the molten and glued portion of the two polyurethane sheets; and   a second step for melt-and-gluing the additional polyurethane sheet by heating while pressing to the molten and glued portion and fixing the second sub-extension hair portion between the additional polyurethane sheet and a portion where the two polyurethane sheets are molten and glued.   
     
     
         14 . The process of  claim 13 , further comprising:
 a third step for disposing a newly added polyurethane sheet on a portion in which a third sub-extension hair portion is stacked in layers on the second sub-extension hair portion and one end of the third sub-extension hair portion is overlapped on the molten and glued portion of the three polyurethane sheets; and   a third step for melt-and-gluing the newly added polyurethane sheet by heating while pressing to the molten and glued portion and fixing the third sub-extension hair portion between the newly added polyurethane sheet and a portion where the three polyurethane sheets are molten and glued.   
     
     
         15 . The process of  claim 12 , wherein the thickness of the synthetic resin is 0.06˜0.1 mm. 
     
     
         16 . The process of  claim 14 , wherein in each of the first through third sub-extension hair portions, the extension hairs are disposed in a plane and there are 1 to 5 strands in the direction of thickness. 
     
     
         17 . The process of  claim 12 , wherein the synthetic resin sheet is polyurethane sheet, and the temperature of the polyurethane sheet in the first step for melt-and-gluing is 150˜160 degrees in Celsius, and the pressure is 30˜50 kg per centimeter squared. 
     
     
         18 . The process of  claim 12 , further comprising a step for forming a plurality of holes with intervals where the synthetic resin sheets stacked in layers are molten and glued. 
     
     
         19 . The process of  13 , further comprising a step for forming a plurality of holes with intervals where the synthetic resin sheets stacked in layers are molten and glued. 
     
     
         20 . The process of  claim 14 , further comprising a step for forming a plurality of holes with intervals where the synthetic resin sheets stacked in layers are molten and glued.