Mascara brush

Abstract

Brush for applying a product, in particular a cosmetic product, to the eyelashes or eyebrows, comprising: —a core ( 40 ) extending along a longitudinal axis and comprising two branches that are twisted together, —bristles clamped between the branches of the core ( 40 ), the free end of the bristles defining an envelope surface (S), the envelope surface (S) having at least two ribs delimited by notches ( 30 ) formed by two longitudinally extending flanks, the two flanks of at least one notch comprising flat portions.

1 - 18 . (canceled) 
     
     
         19 . A brush for applying a cosmetic product to the eyelashes or eyebrows, comprising:
 a core extending along a longitudinal axis and comprising two branches that are twisted together; and   bristles clamped between the branches of the core, the free end of the bristles defining an envelope surface, the envelope surface having at least two ribs delimited by notches formed by two longitudinally extending flanks, the two flanks of at least one notch comprising flat portions, the brush having, in cross section, a shape of a cross with four branches, the branches being formed by the ribs.   
     
     
         20 . The brush according to  claim 19 , comprising four notches, the flanks of at least one notch forming between them an angle of between 70° and 110°. 
     
     
         21 . The brush according to  claim 19 , comprising four notches, the flanks of at least one notch forming between them an angle of between 80° to 100°. 
     
     
         22 . The brush according to  claim 19 , comprising four notches, the flanks of at least one notch forming between them substantially a right angle. 
     
     
         23 . The brush according to  claim 19 , at least one notch having substantially a dihedral shape. 
     
     
         24 . The brush according to  claim 19 , in which a ridge of at least one notch at the intersection between two flanks of the notch is situated at a non-zero distance from the core. 
     
     
         25 . The brush according to  claim 24 , the distance being between 0.2 and 2.5 mm. 
     
     
         26 . The brush according to  claim 19 , having in cross section a shape with axial symmetry with respect to the longitudinal axis. 
     
     
         27 . The brush according to  claim 19 , in which the bristles extend longitudinally between a proximal end and a distal end of an applicator part, at least one notch being formed along more than half the length of the applicator part. 
     
     
         28 . The brush according to  claim 27 , wherein at least one notch is formed from one of the ends to the other. 
     
     
         29 . The brush according to  claim 19 , in which the envelope surface has a substantially frustoconical shape, the diameter of the envelope surface decreasing towards the distal end of the brush, at least along more than half the length of the applicator part of the brush. 
     
     
         30 . The brush according to  claim 29 , in which the envelope surface has a substantially frustoconical shape, the diameter of the envelope surface decreasing towards the distal end of the brush along more than 9 tenths of the length of the applicator part of the brush. 
     
     
         31 . The brush according to  claim 19 , in which the notches are identical to each other. 
     
     
         32 . The brush according to  claim 19 , each notch having two flanks of substantially identical width and length. 
     
     
         33 . The brush according to  claim 22 , in which the ridge of at least one notch extends substantially parallel to the longitudinal axis of the core. 
     
     
         34 . The brush according to  claim 19 , in which the ribs have rounded summits at their free end. 
     
     
         35 . The brush according to  claim 19 , the ribs being of the same radial dimension, for a given cross section of the brush. 
     
     
         36 . The brush according to  claim 19 , in which the width of the ribs is between 1.5 mm and 4 mm. 
     
     
         37 . A packaging and application device comprising:
 a container containing a cosmetic product to be applied to the eyelashes or eyebrows; and   the brush according to  claim 19 .   
     
     
         38 . The method for manufacturing the brush according to  claim 19 , comprising the steps of:
 producing a brush blank with a twisted core having a rectilinear longitudinal axis; and   cutting out the bristles in such a way as to form the notches in order to obtain the brush, by milling.   
     
     
         39 . The method according to  claim 38 , the milling being performed by moving a cutting tool parallel to the longitudinal axis of the core. 
     
     
         40 . The method according to  claim 38 , comprising curving or bending the brush, after cutting. 
     
     
         41 . A brush for applying a cosmetic product to the eyelashes or eyebrows, comprising:
 a core extending along a longitudinal axis and comprising two branches that are twisted together; and   bristles clamped between the branches of the core, the free end of the bristles defining an envelope surface, the envelope surface having at least two ribs delimited by notches formed by two longitudinally extending flanks, the two flanks of at least one notch comprising flat portions, the width of the ribs being between 1.5 and 4 mm.   
     
     
         42 . A brush for applying a cosmetic product to the eyelashes or eyebrows, comprising:
 a core extending along a longitudinal axis and comprising two branches that are twisted together; and   bristles clamped between the branches of the core, the free end of the bristles defining an envelope surface, the envelope surface having at least two ribs delimited by notches formed by two longitudinally extending flanks, the two flanks of at least one notch comprising flat portions, the ribs being of the same radial dimension, for a given cross section of the brush.