| 摘要 |
An easy openable closure device for a packaging container, comprising an outer layer, for instance injection moulded of plastics, and an inner layer, possibly comprising several sublayers, and such that it gives the closure device a specific characteristics as to welding possibilities, gas barrier and light barrier. A first tearing denotation is arranged in the outer layer and merges into a second tearing denotation under a tangentially acute angle, the second denotation extending circumferentially around the closure device. At both sides of the circumferential tearing denotation, the inner layer is sealed to or connected to the outer layer. In the outer layer there is arranged an element having a portion for penetrating the first tearing denotation in the outer layer inside the said sealing region. The strength of the second tearing denotation is lower than the sealing strength between the layers and the latter strength is higher than the tearing strength of the inner layer. |
