Stick Of Cosmetic Product Comprising Two Compositions Having A Surface In Relief, Method And Device For Manufacturing Such A Stick Of Cosmetic Product

Abstract

Stick of cosmetic product, in particular of lipstick, comprising two compositions A and B extending along a longitudinal axis, method and device for manufacturing such a stick of cosmetic product, the stick of cosmetic product, the stick of cosmetic product having a side surface presenting a decorative surface portion in relief.

1 . A stick of cosmetic product, in particular of lipstick, comprising two compositions A and B extending along a longitudinal axis, the stick of cosmetic product having a side surface presenting a decorative surface portion in relief. 
     
     
         2 . The stick of cosmetic product according to  claim 1 , wherein the stick of cosmetic product is of the central part-sheath type, the two compositions A and B being arranged relative to one another to form a central part surrounded by a sheath along the longitudinal axis, the sheath having a side surface presenting the decorative surface portion in relief. 
     
     
         3 . The stick of cosmetic product according to  claim 1 , having a beveled free end. 
     
     
         4 . The stick of cosmetic product according to  claim 2  having a beveled free end, wherein the sheath has, at the beveled free end, a constant thickness around the central part. 
     
     
         5 . The stick of cosmetic product according to  claim 3 , wherein at the beveled free end, the central part is concentric with the sheath. 
     
     
         6 . The stick of cosmetic product according to  claim 1 , wherein the decorative surface portion in relief is protruding or recessed. 
     
     
         7 . A method for manufacturing a stick of cosmetic product, in particular of lipstick, comprising two compositions A and B, extending along a longitudinal axis, the stick having a side surface presenting a decorative surface portion in relief, the method including:
 a step of placing a core in a cup having a surface portion in relief,   a step of pouring or injecting a composition A between the core and the cup so as to form a first member,   a step of removing the core from the cup,   a step of pouring or injecting a composition B so as to form a second member, thereby forming a stick of cosmetic product, and   a step of deforming the cup so as to demold the stick of cosmetic product.   
     
     
         8 . The method according to  claim 7 , enabling the manufacture of a stick of cosmetic product, in particular of lipstick, of the central part-sheath type, the two compositions A and B being arranged relative to one another to form a central part surrounded by a sheath along the longitudinal axis, the sheath having a side surface presenting the decorative surface portion in relief, the method including:
 a step of placing a core in a cup having a surface portion in relief,   a step of pouring or injecting a composition A between the core and the cup so as to form a sheath,   a step of removing the core from the cup,   a step of pouring or injecting a composition B into the sheath so as to form a central part surrounded by the sheath, thereby forming said stick of cosmetic product of the central part-sheath type, and   a step of deforming the cup so as to demold the stick of cosmetic product.   
     
     
         9 . The method for manufacturing a stick of cosmetic product according to  claim 7 , further comprising a step W of lubricating the core. 
     
     
         10 . A device for manufacturing a stick of cosmetic product, in particular of lipstick, comprising two compositions A and B, extending along a longitudinal axis, the stick having a side surface presenting a decorative surface portion in relief, the device comprising:
 a base having a cavity formed in the base,   an elastic cup received in the cavity, the cup having a surface in relief,   a core movable in translation between an inserted position in which the core is positioned in the cup, the core coming into contact with the bottom of the cup, and a withdrawn position in which the core is withdrawn from the cup, and   a means for deforming the cup in order to be able to extract a stick of cosmetic product from the cup.   
     
     
         11 . The device according to  claim 10 , wherein the stick of cosmetic product, in particular of lipstick, is of the central part-sheath type, the two compositions A and B being arranged relative to one another to form a central part surrounded by a sheath along the longitudinal axis, the sheath having a side surface presenting the decorative surface portion in relief. 
     
     
         12 . The device according to  claim 10 , wherein
 the cup is of a size smaller than that of the cavity so as to define a space between the cup and the cavity, and   it comprises means for creating negative pressure in the space.   
     
     
         13 . The device according to  claim 10 , wherein the core has an air outlet channel leading between: the end of the core in contact with the inner surface of the cup, and a portion of the core outside the cup when the core is inserted into said cup. 
     
     
         14 . The device according to  claim 10 , further comprising pressure adjustment means for adjusting the pressure of the core in the cup. 
     
     
         15 . The device according to  claim 14 , wherein the pressure adjustment means comprises a spring. 
     
     
         16 . The device according to  claim 14 , further comprising a means for guiding in translation and for centering the core in the cup. 
     
     
         17 . The device according to  claim 16 , wherein the means for guiding in translation and for centering is retractable. 
     
     
         18 . The device according to  claim 16 , wherein the core and the means for guiding in translation and for centering are mounted on a block. 
     
     
         19 . The device according to  claim 17 , further comprising a magnetization means for maintaining in the retracted position the means for guiding in translation and for centering. 
     
     
         20 . The device according to  claim 16 , wherein the means for guiding in translation and for centering comprises a centering ring adapted to engage with a housing provided in the base. 
     
     
         21 . The device according to  claim 10 , comprising a plurality of cavities, a plurality of elastic cups each having a surface in relief, and a plurality of cores, wherein the plurality of cavities are formed in the base, wherein each of the cups is received in each cavity, and wherein each of the cores is movable in translation between an inserted position in which the cores are positioned in the cups and a withdrawn position in which the cores are withdrawn from the cups.