| 摘要 |
A method for manufacturing a container having a longitudinal joint where the cut edges are not exposed to the interior of the container. The invention is especially well suited for laminate tubes, i.e. metal foil containing tubes or corresponding high barrier material tubes, preferrably such material where high frequency welding is possible. As a first step, two longitudinal end edges (15, 16) of a tube blank are placed with overlap such that one and the same side of the blank forms abutment surfaces (19, 20) in the region of the overlap and that the blank hereby forms a hollow body. One (16) of the longitudinal edges is placed such that one end portion thereof extends a distance outside the second edge along the entire length of the blank. A seal is obtained in the region of said overlap, between said abutment surfaces (19, 20). Thereafter the overlap and the protruding end portions are folded down against the exterior of the tube body and a further welding operation is carried out, whereafter the region of the longitudinal joint is flattened and finally shaped into correspondence with the said outer contour ot the tube body. |
