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Ring and closure for cans
| Details |
Inventors: Bloeck, Siegfried; Luthi, Rudolf;
Assignee: Swiss Aluminium Ltd. (Chippis, CH)
Primary Examiner: Hall; George T.
Assistant Examiner:
Attorney, Agent or Firm: Bachman and LaPointe
The process of the present invention allows the manufacture of lacquered aluminum or tin-plate rings which have the inner edge thereof bent over outwards so that they are suitable for the closures on cans for foodstuffs. A ring blank made of lacquered sheet is pre-shaped by deep drawing to form the curvature needed for bending over the inner cut edge. The final shaping of the pre-shaped blank into a ring for a can lid takes place, after stamping out the opening, by stretching and bending over the cut edge. When a tear-back membrane is sealed on to the bent-over edge, the ring is suitable as an easyly opened closure for cans for foodstuffs. |
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DETAILED DESCRIPTION The easily opened containers representing the state of the art today as outlined above exhibit, besides their specific advantages, significant disadvantages.
It is the object of the present invention to provide favorably priced, easily opened container which, after opening, does not exhibit sharp edges which represent a risk of injury, can be sterilized, is corrosion resistant towards aggressive contents and is, to a large degree, resistant to mechanical damage can be met with a can having an opening system comprising an aluminum tear-back membrane sealed to a ring for the lid.
The cut edge of the ring produced during the manufacture of the ring and delimiting the size of opening of the can must be turned outwards and the tear-back membrane sealed to the edge which has been folded over.
In principle it is possible after punching out the opening to turn the cut edge outwards by bending it upwards and folding it over.
However it turns out that this calls for a very small radius of curvature because the process involves drawing the metal i.
e.
deformation as a result of elongation of the metal.
Because the radius of curvature is small, the lacquer coating is damaged in the area which is sharply bent over.
If the radius of curvature is increased the elongation properties of the metal are insufficient to prevent tearing of the cut edge during the large increase in diameter which occurs during bending over.
The present invention provides a process for manufacturing lacquered rings for can lids of aluminum or tin-plate in which the inner cut edge is turned outwards and is suitable for sealing on an aluminum membrane which can be pulled off.
The objects of the present invention are attained by providing a blank for a lid ring which is produced from a lacquered sheet and is preformed by deep drawing to form the required curvature for folding over of the inner cut edge.
The final shaping of the ring takes place after punching out the opening by stretching and turning over the cut edge
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Manufacturing Materials 
