Claims
- 1. A lid for an easy-opening can comprising a laminate of a metal foil (1) and a heat-shrinkable plastics film (2) and including a non-traversing mechanical pre-incision (3) of the metal foil on an outside face, wherein the heat-shrinkable plastics film has on its outside face a continuous depression (4) opposite the pre-incision.
- 2. A lid according to claim 1, wherein the plastics film (2) is a heat-shrinkable resin selected from the group consisting of polyolefin, polyamide and polyester.
- 3. A lid according to claim 2, wherein the plastics material (2) consists of a bi-orientated polypropylene.
- 4. A lid according to one of claims 1 to 3, wherein the thickness e of the film (2) is between about 10 and 100 .mu.m.
- 5. A lid according to one of claims 2 to 3, wherein the residual thickness r of the plastics film (2) is greater than or equal to 2 .mu.m.
- 6. A lid according to claim 5, wherein the residual thickness r of the plastics film (2) is greater than or equal to 5 .mu.m.
- 7. A lid according to one of claims 2 to 3, wherein the width (1) of the depression is less than or equal to 150 .mu.m.
- 8. A lid according to one of claims 1 to 3, wherein the metal foil is an Al alloy selected from the group consisting of series 5000 and 3000 alloy.
- 9. A method of producing an easy-opening lid for a can according to one of claims 1 to 3, comprising the steps of: forming a laminate of a metal foil and a heat-shrinkable plastics film; forming by a source of concentrated heat a non-traversing pre-incision corresponding to a tearing line in an outer surface of the metal foil; forming a depression (4) in the outer surface of the plastics film opposite the tearing line, said depression being formed.
- 10. A lid according to claim 8, wherein the continuous depression (4) is laser beam generated.
Priority Claims (1)
Number |
Date |
Country |
Kind |
90 11634 |
Sep 1990 |
FRX |
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Parent Case Info
This is a continuation of copending application Ser. No. 07/735,852, filed Jul. 25, 1991 now abandoned.
US Referenced Citations (5)
Continuations (1)
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Number |
Date |
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Parent |
735852 |
Jul 1991 |
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