| 摘要 |
<p>A fluid carton made of cardboard, paper of the like, rendered impervious to fluids by a coating of plastics at least on the inside, has a double-walled triangular flap at least at one side, the inside of the flat communicating with the inside of the carton. A manually engageable double cardboard strip with a sealing seam is provided in the upper triangular wall of the flap and extends from the tip of the flap and into the adjacent upper wall panel of the carton. A weld, which seals the two triangular walls together in a fluid-tight manner, extends substantially transversely to the cardboard strip. At least one of the two triangular walls of the triangular flap is partially punched in along a line adjacent the weld, at the side thereof towards the tip of the triangular flap. The various superposed layers of wall are compressed to almost the same thickness (D) in the region of the weld. Such a weld is provided on both sides of the punched line and runs from one side edge of the triangular flap to the other, substantially in the middle of the flap.</p> |
