| 摘要 |
An easy openable closure device for a packaging container, comprising an outer layer (11), 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 for instance welding possibilities, gas barrier and light barrier. A first tearing denotation (20) is arranged in the outer layer and merges into a second tearing denotation (15) under a tangentially acute angle, said second denotation extending circumferentially around the closure device. At both sides of the circumferential tearing denotation (15), the inner layer (12) is sealed to or connected to the outer layer (11). In the outer layer there is arranged an element (17) having a portion (18) for penetrating the first tearing denotation (20) in the outer layer inside the said sealing region (16, 16 min ). The strength of the second tearing denotation (15) is lower than the sealing strength between the layers and the latter strength is higher than the tearing strength of the inner layer. |
