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US 10,494,139 B2Granted
Method and device for producing tear-off lids and tear-off lid
AssigneeSoudronic AG
InventorsPascal Gauch, Peter Taiana
Life of this patent
Estimating the term…
Abstract
A tear-off lid with a curled edge of the removal opening is formed such that before the edge is curled, a plastics layer provided as a band of low thickness and preferably only 0.1 mm thickness is applied to the collar of the lid ring. In this way, a good seal of the cut edge of the tear-off lid is produced economically and with the possibility for production at a high rate.
Claims12
A method for producing tear-off lids, wherein
- from a lid blank a lid ring having a central removal opening which is surrounded by a sealing flange is formed by means of a punching process;
- the edge of the central removal opening is formed by drawing to a collar projecting away from the sealing flange;
- the collar is curled at the free end thereof;
- a tear-off film is sealed onto the sealing flange;
- and
- wherein before the curling of the free end of the collar, a band-shaped strip of plastics is applied to the inside of the collar.
3 more elements
Dependencies are inferred from the claim text.