Patent ID: 8256632

Claim:
An opening device for a packaging container, comprising: a neck portion having a projection; and a screw cap, the screw cap having a tubular first part arranged to enclose the neck portion and engage with the same to secure the screw cap to the packaging container and a second part arranged to close the first part at one end thereof, wherein a wall of the first part of the screw cap is provided with a weakening extending in a circumferential direction of the first part and a recess extending in a longitudinal center axial direction of the first part, the recess being arranged to receive the projection of the neck portion, which projection is directly injection-molded in the recess, and wherein a tamper flap of the first part, which tamper flap is defined by the weakening and the recess, is automatically deformable in connection with a first time opening of the packaging container by cap rotation because of an edge of the tamper flap, which edge is defined by a surface of the recess, being initially obstructed in a cap rotation direction by the projection of the neck portion.