Hair fasteners and methods of manufacture thereof

Abstract

There is disclosed a hair fastener. The hair fastener is in the form of a loop for securing a log of hair within the loop. The hair fastener has an inner elastic core and an outer fabric enveloping the inner elastic core, wherein the elastic core is made of a band with a width of 2 to 6 mm and a thickness of 1 to 3 mm, and made of thermoplastic elastomer (TPE). The hair fastener is adapted to assume a first, default, configuration in which an opening defined and surrounded by the loop has a first area and a second, fully expanded, configuration in which the opening defined and surrounded by the loop has a second area. Due to the physical configuration and material characteristics of the band, the band is elongateable up to 8.5 to 10 times of its original length thus enabling the first area of the loop to expand to the second area by a factor 72.3 to 100.

1 . A hair fastener in the form of a loop for securing a log of hair within the loop, comprising an inner elastic core and an outer fabric enveloping the inner elastic core, wherein the elastic core is made of a band with a width of 2 to 6 mm and a thickness of 1 to 3 mm, and made of thermoplastic elastomer (TPE), wherein the fastener is adapted to assume a first, default, configuration in which an opening defined and surrounded by the loop has a first area and a second, fully expanded, configuration in which the opening defined and surrounded by the loop has a second area, and wherein, due to the physical configuration and material characteristics of the band, the band is elongateable up to 8.5 to 10 times of its original length thus enabling the first area of the loop to expand to the second area by a factor 72.3 to 100. 
     
     
         2 . A hair fastener as claimed in  claim 1 , wherein the tensile strength of the band has a value of 3.02 to 4.08 Mpa. 
     
     
         3 . A hair fastener as claimed in  claim 2 , wherein the tensile modulus of the band has a value of 0.37 to 0.49 Mpa. 
     
     
         4 . A hair fastener as claimed in  claim 3 , wherein the tensile stress of the band at 100% has a value of 0.38 to 0.52 Mpa. 
     
     
         5 . A hair fastener as claimed in  claim 4 , wherein the band has a Shore Hardness A of 23.8 to 32.2. 
     
     
         6 . A hair fastener as claimed in  claim 5 , wherein the maximum pull strength of the band is 57.31N. 
     
     
         7 . A hair fastener as claimed in  claim 6 , wherein the specific gravity of the band has a value of substantially 0.9. 
     
     
         8 . A hair fastener as claimed in  claim 1 , wherein the outer fabric is sufficiently loose to provide room for maximum expansion of the band. 
     
     
         9 . A hair fastener as claimed in  claim 1 , wherein the band resembling a circle has a joint connecting opposite free ends of the band by adhesives and enveloped in the outer fabric. 
     
     
         10 . A hair fastener as claimed in  claim 1 , wherein the band resembling a circle has an integral structure made from one injection molding step free of a joint and enveloped within the outer fabric. 
     
     
         11 . A method of manufacture of a hair fastener as claimed in  claim 1 , comprising a step of forming the elastic core by the thermoplastic elastomer by way of injection molding using a melt flow rate of 7.57 to 10.23.