| 摘要 |
<p>Opening arrangements for packing containers which are manufactured from a flexible material and intended for pressurized contents, e.g., beer, are sometimes in the form of a tear-off cover strip which is sealed to the packing container wall and covers punched out pouring opening. In order to withstand the high internal pressure caused by the contents, the seal between the cover strip and the packing material must be strong, which detrimentally affects the openability of the packing container. By ensuring that the mutual bond between the different layers in the packing laminate is weaker than the seal between the cover strip and the outer layer of the container material, a readily opening packing container is provided, in spite of the seal between the cover strip and the packing laminate being of a strength such that the risk of leakage or unintentional opening is small. By sealing the cover strip in a zone extending around the pouring opening which is at a small distance from the actual pouring opening and by providing -the pouring opening with a "set in" pouring edge, the properties of the opening arrangement are optimized further without increasing the risk of leakage or making the handling more difficult.</p> |
