Patent ID: 8431201

Claim:
A plastic cap for a container ( 4 ), which cap ( 1 ), for oxygen-tight sealing of the container ( 4 ), comprises: an integral oxygen-tight liner ( 8 ) to be joined to an opening end surface ( 6 ) of a spout ( 5 ) on the container ( 4 ) and, for attachment to the spout ( 5 ), has a circumferential skirt ( 2 ), which is arranged to surround the spout ( 5 ) and which has an internal annular bead ( 3 ) adapted for snap connection with a corresponding annular groove ( 7 ) in the spout ( 5 ), wherein the integral oxygen-tight liner ( 8 ) having an oxygen-tight intermediate layer ( 83 ), whose side facing the cap ( 1 ) is coated with a first plastic layer ( 81 ) arranged to be permanently joined to the cap ( 1 ) and whose side facing the container ( 4 ) is coated with a second plastic layer ( 82 ) arranged to be temporarily hermetically sealed to said opening end surface ( 6 ), and the integral oxygen-tight liner ( 8 ) and the cap ( 1 ) being joined to each other such that the integral oxygen-tight liner ( 8 ) when removing the cap ( 1 ) from the spout ( 5 ) accompanies the cap ( 1 ), wherein said first plastic layer ( 81 ) is arranged to be permanently joined, when injection-moulding the cap ( 1 ), to the plastic material of the cap ( 1 ), and that the skirt ( 2 ) at the end facing the container ( 4 ) has a radial projection ( 10 ), which serves as a thumb grip and which when opening the container ( 4 ) allows the cap ( 1 ) and the integral oxygen-tight liner ( 8 ) to be bent away from said opening end surface ( 6 ) so that the temporary, hermetic seal between the second plastic layer ( 82 ) of the integral oxygen-tight liner ( 8 ) and the opening end surface ( 6 ) of the spout ( 5 ) is gradually broken, wherein the intermediate layer ( 83 ) of the integral oxygen-tight liner ( 8 ) is made of metal material enabling induction-welding of the cap ( 1 ) to the opening end surface ( 6 ) of the container ( 4 ).