Stick of cosmetic product comprising two compositions having a surface in relief, method and device for manufacturing such a stick of cosmetic product

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 an elastic cup having a surface portion in relief, the core coming into contact with the bottom of the cup,
• 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.

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, for pouring or injecting said composition A between the core and the cup so as to form a first member, the core coming into contact with the bottom of the cup,
• and a withdrawn position in which the core is withdrawn from the cup, for pouring or injecting said composition B so as to form a second member, thereby forming a stick of cosmetic product, and
• a vacuum pump for deforming the cup so as to demold the stick of cosmetic product.