Process for manufacturing lids with a closure strip covering at least one pouring hole, in particular such lids for beverage cans
AssigneeSwiss Aluminium Ltd.
InventorsOldrich Stanek, Siegfried Bloeck
Life of this patent
Estimating the term…
Abstract
Lids made of aluminum alloys or ferrous material such as tin plate or tin free steel having at least one stamped out pouring hole and, if desired, at least one hole for air have hot sealed pull-off strips covering the said holes. On the inner side of the lids the region around the holes is pre-treated with an adhesive primer and then coated with a plastisol layer thus providing the cut edges at the holes with protection against attack by the contents of the can.
Claims12
Process for manufacturing a can lid with sealed on closure strip covering at least one pouring hole having cut edges therein which comprises providing said closure strip with polyamide heat sealable surface sealed thereon, sealing said closure strip to the can lid, treating the inner face of the strip and the surrounding region on the inner face of the lid material with an adhesive primer consisting of a solution of a polyacrylic ester, drying said primer, coating the treated region on the inner face of the lid including said cut edges with a plastisol layer , and allowing said plastisol layer to gel with the aid of a heat treatment, whereby said cut edges are not attacked by the can contents.
Dependencies are inferred from the claim text.