Method for manufacturing a mascara brush

Abstract

A method for manufacturing a brush for applying a product to the eyelashes and/or eyebrows. The brush includes a core having two branches which are twisted together and bristles clamped between the branches, and the method includes the steps of a) producing a brush blank, of which the envelope surface defines at least one first groove, and b) producing, in the blank obtained at a), at least one second groove intersecting the first one, at least one of the grooves being a helical groove.

1 . A method for manufacturing a brush for applying a product to the eyelashes and/or eyebrows, comprising a core having two branches which are twisted together and bristles clamped between the branches, defining an envelope surface having at least one first helical groove and one second groove intersecting the first, the method comprising:
 a) producing a brush blank, of which the envelope surface defines at least one first groove,   b) producing, in the blank obtained at a), at least the second groove intersecting the first groove.   
     
     
         2 . The method according to  claim 1 , the helical groove being obtained by machining the blank with a relative helical displacement between the tool and the brush. 
     
     
         3 . The method according to  claim 1 , the helical groove being obtained by machining at least one longitudinal groove, then twisting the blank about its longitudinal axis in order to give said groove a helical trajectory. 
     
     
         4 . The method according to  claim 1 , comprising the production of several first grooves. 
     
     
         5 . The method according to  claim 4 , wherein said first grooves are distributed at equal angles about the longitudinal axis of the core. 
     
     
         6 . The method according to  claim 1 , wherein the or at least one of said first grooves have, in cross section, a V-shaped profile open towards the outside. 
     
     
         7 . The method according to  claim 1 , wherein the or each first groove extends at least 180° about the longitudinal axis of the core. 
     
     
         8 . The method according to  claim 1 , wherein said one first groove extends along more than 9/10 of the length of the part of the core carrying the bristles. 
     
     
         9 . The method according to  claim 1 , comprising the production of several second grooves. 
     
     
         10 . The method according to  claim 9 , wherein the second grooves are distributed at equal angles about the longitudinal axis of the core. 
     
     
         11 . The method according to  claim 1 , wherein the or at least one of the second grooves having, in cross section, a V-shaped profile open towards the outside. 
     
     
         12 . The method according to  claim 1 , wherein the one or more second grooves being rectilinear. 
     
     
         13 . The method according to  claim 1 , wherein the one or more second grooves being non-rectilinear. 
     
     
         14 . The method according to  claim 1 , wherein the one or more second grooves being helical. 
     
     
         15 . A brush for applying a product to the eyelashes and/or eyebrows, comprising a core having two branches which are twisted together and bristles held by the core, defining an envelope surface having at least one first helical groove and a second groove intersecting the first one. 
     
     
         16 . The brush according to  claim 15 , comprising several first grooves and at least one second groove or at least one first groove and several second grooves, the grooves defining a grid pattern on the envelope surface on account of their intersections. 
     
     
         17 . Packaging and application device for applying a cosmetic product to the eyelashes and/or eyebrows, comprising:
 a container containing the product to be applied,   an applicator comprising a brush as defined in  claim 20 .   
     
     
         18 . The method of  claim 1 , comprising the production of an uneven number of first grooves. 
     
     
         19 . The method of  claim 1 , wherein the or each first groove extends between a half turn and four turns about the longitudinal axis of the core. 
     
     
         20 . The method according to  claim 1 , comprising the production of an even number of second grooves. 
     
     
         21 . The method according to  claim 9 , the number of second grooves being less than or equal to the number of first grooves. 
     
     
         22 . The method according to  claim 1 , the one or more second grooves intersecting the one or more first grooves with an angle of between 60° and 120°.