| 摘要 |
A method and apparatus for triple roll seaming flanged end closure to a flanged container body. Before the flanges of the end closure and container body are rolled together by a suitably shaped seaming roll, the peripheral portion of the end closure flange is imparted with a frustoconical portion at an angle between about 20 DEG and 50 DEG with respect to the yet undeformed part of the end closure flange followed by a first rolled section which curves substantially around, parallel to the frustoconical zone. The raising of the frustoconical portion and the forming of the first rolled section may be effected substantially simultaneously, either before or after the end closure is positioned in the open end of the container body, in a first tool setup including a single forming roll with parallel entry and exit zone joined through a frustoconical zone connected to a radiused zone. Alternatively the frustoconical zone may be stamped in the press when the flange of the end closure is formed in which case the rolled section is later formed at the free end of the frustoconical portion with a forming roll. |
