Details of a process machine that creates a ‘ledge seal’ on a three-piece tinplate can so that an easy-open aluminium end can be applied without a top ring have been revealed by Blema Kircheis, the German-based manufacturer.
The machine offers the feature of a ledge up to 40mm from the top of the can, enabling items such as spoons or literature to be included in a compartment without contacting powder-based products.
First shown as a concept in 2011 as the RHO III with an inside lip to which the membrane end was applied, the latest version is called RHO V. In the process, a bead is formed in the wall of the can with a depth of 4-6mm which is then flattened to form the ‘ledge’.
Two GAMMA II modular machines are used for each process with six turrets rotating at up to 1,500rpm. A top curl and bottom flange is formed on the body before the deep beading and flattening process.
The cans are then fed to the RHO V machine, which incorporates dual lanes and stations to heat-seal the aluminium membranes. These are blanked and formed from CanSeal Pro, multi-layer polyester-coated aluminium supplied by Amcor.
Leak testing and palletising is provided in a process that runs at up to 300 cans per minute.
More information from Gebrüder Leonhardt GmbH & Co Blema Kircheis, Erdmann-Kircheis-Straße 13, 08280 Aue, Germany. Tel: 49 3771 2780. Website: www.blema.de