Method for forming a rupturable area in a container

A method of making a container wall a part of which is to be openable, the method comprising forming in the wall a path where the wall is to be ruptured, the path being a weakening in the material of the wall connecting the openable and an anchored part which is to remain in place after opening, locating the wall between mould tools, the tool on a first face of the wall including a rupture recess with which the path of weakening registers, and the tool on the other face of the wall defining a bead channel which extends along the length of the path and spans the path and a region of the wall on each side of the path and injecting mouldable material into said bead channel to form a bead adherent to said other face of the wall, to displace those wall regions of the openable and anchored wall parts immediately adjacent the path into the rupture recess in the mould tool to further reduce the strength of the connection between openable and anchored wall parts and to form a seal at the displaced wall regions by adhering to the wall adjacent each displaced region and removing the wall from the mould, the resultant wall being openable by pull on the bead to disconnect the openable and anchored parts of the wall.