Cosmetic product packaging assembly comprising a container made of cellulose material and a closure element

Abstract

The invention relates to a cosmetic product packaging assembly comprising a container made of cellulose material extending along a longitudinal axis (X) and a closure element (3), wherein the closure element (3) is provided with a sealing element (4) having a radially inner sealing skirt and a radially outer sealing skirt that together define a groove, and wherein, when the closure element (3) closes the container, the neck (21) of the container is partially received in the groove of the sealing element (4) and defines therewith a radially inner interference region, a radially outer interference region and a frontal interference region, said inner interference region and outer interference region having an at least partial overlap in projection on the longitudinal axis (X).

1 . A cosmetic product packaging assembly ( 1 ) comprising:
 a container ( 2 ) extending along a longitudinal axis (X) between a bottom ( 20 ) and a neck ( 21 ), a peripheral wall ( 22 ) connecting said bottom to said neck, said neck ( 21 ) defining an opening (O) and having a radially inner surface ( 23 ) and a radially outer surface ( 24 ) that are connected by a frontal surface ( 25 ) extending in the radial direction, said outer surface ( 24 ) being provided with an axial joining portion ( 26 ), and said inner surface ( 23 ) and said outer surface ( 24 ) each having a smooth axial portion ( 27 ,  28 ) connected to the frontal surface ( 25 );   a closure element ( 3 ) comprising a plate ( 30 ) intended to extend orthogonal to the longitudinal axis (X) when the closure element ( 3 ) closes the container ( 2 ) and having an upper surface ( 31 ) and a lower surface ( 32 ), and a fastening skirt ( 33 ) extending perpendicularly from the lower surface ( 32 ) of the plate ( 30 ) to a frontal surface ( 36 ), said fastening skirt ( 33 ) comprising a radially inner surface ( 34 ) and a radially outer surface ( 35 ) that are connected by the frontal surface ( 36 ), said inner surface ( 34 ) being provided with an axial joining portion ( 37 ) designed to cooperate with the axial joining portion ( 26 ) of the outer surface ( 24 ) of the neck ( 21 ) of the container ( 2 );   wherein at least the neck ( 21 ) of the container ( 2 ), and preferably the majority or even all of the container ( 2 ), comprises a cellulose material;   wherein the lower surface ( 32 ) of the closure element ( 3 ) is provided with a sealing element ( 4 ) comprising a base ( 40 ) having an upper surface ( 41 ) and a lower surface a radially inner sealing skirt ( 43 ) and a radially outer sealing skirt said base ( 40 ) and said sealing skirts ( 43 ,  44 ) defining a groove ( 45 ),   and wherein, when the closure element ( 3 ) closes the container ( 2 ), the smooth axial portions ( 27 ,  28 ) and the frontal surface ( 25 ) of the neck ( 21 ) of the container ( 2 ) are at least partially received in the groove ( 45 ) of the sealing element ( 4 ) and define therewith a radially inner interference region (ZII), a radially outer interference region (ZIE) and a frontal interference region (ZIF), said inner interference region (ZII) and outer interference region (ZIE) having an at least partial overlap (c) in projection on the longitudinal axis (X).   
     
     
         2 . The assembly as claimed in  claim 1 , wherein the overlap (c) in projection on the longitudinal axis (X) of the inner interference region (ZII) and outer interference region (ZIE) has an axial length greater than or equal to 0.5 mm, better still greater than or equal to 1 mm, even better still greater than or equal to 2 mm, in particular between 2 mm and 5 mm, and in particular substantially equal to 2.5 mm. 
     
     
         3 . The assembly ( 1 ) as claimed in  claim 1 , wherein the axial joining portion ( 26 ) of the outer surface ( 24 ) of the neck ( 21 ) of the container ( 2 ) and the axial joining portion ( 37 ) of the inner surface ( 34 ) of the fastening skirt ( 33 ) of the closure element ( 3 ) are threaded portions. 
     
     
         4 . The assembly ( 1 ) as claimed in  claim 1 , wherein one and/or the other of the inner sealing skirt ( 43 ) and outer sealing skirt of the sealing element ( 4 ) has (have) a chamfer ( 46 ) flaring toward the outside of the groove. 
     
     
         5 . The assembly ( 1 ) as claimed in  claim 1 , wherein the base ( 40 ) of the sealing element ( 4 ) is in the form of a disk or ring, of which the upper surface ( 41 ) extends facing the lower surface ( 32 ) of the plate ( 30 ) of the closure element ( 3 ). 
     
     
         6 . The assembly as claimed in  claim 1 , wherein the sealing element ( 4 ) is manufactured separately from the closure element ( 3 ) and subsequently fastened thereto, preferably in a removable manner. 
     
     
         7 . The assembly as claimed in  claim 1 , wherein the closure element ( 3 ) is made of a first material and the sealing element is made of a second material, which is different from the first material. 
     
     
         8 . The assembly as claimed in  claim 1 , wherein the sealing element ( 4 ) is attached to the closure element ( 3 ) by overmolding. 
     
     
         9 . The assembly as claimed in  claim 1 , wherein the cellulose material of which at least the neck ( 21 ) of the container ( 2 ) is made comprises paper, cardboard, paper pulp, cardboard pulp, bamboo or a bamboo derivative or else bagasse, a fibrous residue derived from sugarcane, or a mixture of these materials. 
     
     
         10 . The assembly as claimed in  claim 1 , wherein the sealing element ( 4 ) is made of plastic material, in particular polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), elastomer material, such as styrene-ethylene-butylene-styrene (SEBS), or a mixture of these materials.