Closure device and container equipped with same

Abstract

The invention concerns a method which consists in moulding a plastic cap ( 1 ) and steps which consist in: providing, proximate to an inner surface of base web ( 7 ) of the cap ( 1 ), a first layer ( 6 ) of material impermeable to a predetermined gas or gases and depositing, on said first layer ( 6 ) set in the cap ( 1 ), a second layer ( 8 ) made of an elastic material different from that of the first layer ( 6 ), said second layer ( 8 ) being designed to form the joint, by isolating the first layer from ambient air.

1 . Method for making a closure device in which a cap moulded from plastics material is equipped with a seal adapted to be arranged in abutment against the neck of a container, characterized in that it comprises steps consisting in: 
 positioning, in the vicinity of an inner surface ( 71 ;  271 ;  371 ) of a bottom web ( 7 ;  207 ;  307 ) of said cap ( 1 ;  201 ;  301 ), a first layer ( 6 ;  206 ;  306 ) of material impermeable to a predetermined gas or gases, and    depositing on said first layer, in place in said cap, a second layer ( 8 ;  208 ;  308 ) made of an elastic material and different from the material constituting the first layer, said second layer being intended to form said seal, by isolating said first layer from the ambient atmosphere.    
     
     
         2 . Method according to  claim 1 , characterized in that it comprises a step consisting in overmoulding said second layer ( 8 ;  208 ;  308 ) on said first layer ( 6 ;  206 ;  306 ).  
     
     
         3 . Method according to one of claims  1  or  2 , characterized in that it comprises a step consisting in overmoulding, by injection or by compression, said first layer ( 206 ) against said bottom web ( 207 ).  
     
     
         4 . Method according to one of claims  1  or  2 , characterized in that it comprises a step of positioning (in  102 ) a plate ( 6 ) pre-cutout from a gas-impermeable material, in the vicinity of said web ( 7 ), said plate then being immobilized against said web by the deposit of said second layer ( 8 ).  
     
     
         5 . Method according to one of claims  1  or  2 , characterized in that it comprises a step of projection (F 5 ) of said first layer ( 306 ) on said inner surface ( 371 ) of said bottom web ( 307 ).  
     
     
         6 . Method according to one of the preceding Claims, characterized in that it comprises a prior step (in  101 ) of moulding said cap ( 1 ;  201 ;  301 ), the positioning of said first layer ( 6 ;  206 ;  306 ) and the deposit of said second layer ( 8 ;  208 ;  308 ) being effected continuously immediately after the moulding of said cap.  
     
     
         7 . Closure device comprising a cap moulded by injection or compression from plastics material and equipped with a seal adapted to be arranged in abutment against the neck of a container, characterized in that it comprises a layer ( 6 ;  206 ;  306 ) of material impermeable to a predetermined gas or gases interposed between said seal ( 8 ;  208 ;  308 ) and a bottom web ( 7 ;  207 ;  307 ) of said cap ( 1 ;  201 ;  301 ), said layer being isolated from the ambient atmosphere by said cap and said seal which is made of a material different from that of the layer of material impermeable to a predetermined gas or gases.  
     
     
         8 . Method according to one of  claims 1  to  6  or device according to  claim 7 , characterized in that said layer ( 6 ;  206 ;  306 ) of impermeable material is a layer ( 63 ) of silica oxide, or of carbon in diamond or amorphous form, integrated in a multi-layer complex ( 6 ) disposed against said bottom web ( 7 ) and covered with a layer ( 8 ) of elastic material forming said seal.  
     
     
         9 . Method according to one of  claims 1  to  6  or device according to one of claims  7  or  8 , characterized in that said layer ( 206 ;  306 ) of impermeable material is made of polyvinylchloride (PVC), of polyvinylidene chloride (PVDC), of ethylene vinyl alcohol (EVOH), of polyamide (PA), of polyethylene naphthalate (PEN), polyvinyl acohol (PVA), acrylate copolymer of polyacrylnitrile (PNA) type, polymethylmethacrylate (PPMA), copolymer of butadiene, styrene, bi-oriented polypropylene (BOPP) or in a mixture based on these products.  
     
     
         10 . Method according to one of  claims 1  to  6  or device according to one of  claims 7  to  9 , characterized in that said first layer ( 306 ) comprises a silica oxide, a varnish or a lacquer or is made by metallization.  
     
     
         11 . Method according to one of  claims 1  to  6  or device according to one of  claims 7  to  10 , characterized in that said seal ( 8 ;  208 ) is made of vinyl acetate (EVA), of elastomer, particularly a derivative of polyamide (PA), or copolymer of polyamide and/or of polyether.  
     
     
         12 . Method according to one of  claims 1  to  6  or device according to one of  claims 7  to  11 , characterized in that said seal ( 8 ;  208 ) is made of a material adapted to absorb a gas or gases, preferably a material adapted to absorb oxygen.  
     
     
         13 . Container for liquid, particularly bottle made of plastics material, equipped with a closure device ( 1 - 8 ;  201 - 208 ) according to one of  claims 7  to  12 .