Claims
- 1. A cover (4) to be heat-sealed on the mouth of a product package (1) and extracted therefrom when opening the package, comprising a paper layer (5), a polymer heat-sealing layer (11), and a non-curling polymer support layer (9) forming a barrier against oxygen disposed therebetween, said polymer heat-sealing layer (11) permitting extraction of the cover after said heat sealing on the mouth of said product package, and said polymer support layer (9) including a crystalline polymer component of high degree of crystallization and an amorphous polymer component to render said cover non-curling.
- 2. The cover according to claim 1, wherein the crystalline polymer component (9) is selected from the group consisting of polyamide (PA), polyethylene terephthalate (PET), polypropylene (PP), and ethyl vinyl alcohol copolymer (EVOH).
- 3. The cover according to claim 1, wherein the amorphous polymer component (9) is selected from the group consisting of polyamide (PA), ethylene methacrylic acid copolymer (EMA), and amorphous polyethylene terephthalate (APET).
- 4. The cover according to claim 1, wherein the support layer (9) contains crystalline polyamide and amorphous polyamide.
- 5. The cover according to claim 1, wherein the support layer (9) contains crystalline polyamide and amorphous ethylene methacrylic acid copolymer.
- 6. A cover (4) to be heat-sealed on the mouth of a product package (1) and extracted therefrom when opening the package, comprising a paper layer (5), a polymer heat-sealing layer (11), and a non-curling polymer support layer (9) forming a barrier against oxygen disposed therebetween, said polymer heat-sealing layer (11) permitting extraction of the cover after said heat sealing on the mouth of said product package, wherein the support layer (9) includes a mixture of 20 to 90 wt-% crystalline polymer component of high degree of crystallization, and 10 to 80 wt-% amorphous polymer component to render said cover non-curling.
- 7. The cover according to claim 1, further comprising a polymer binding agent layer disposed between the support layer (9) and the heat-sealed layer (11).
- 8. The cover according to claim 1, wherein the heat-sealed layer (11) includes a mixture of 5 to 60 wt-% styrene-modified ethylene copolymer acting as a release agent, and 40 to 95 wt-% ethylene copolymer acting as an adhesive agent.
- 9. The cover according to claim 1, wherein the crystalline polymer component (9) is selected from the group consisting of polyamide (PA), polyethylene terephthalate (PET), polypropylene (PP), and ethyl vinyl alcohol copolymer (EVOH) and the amorphous polymer component (9) is selected from the group consisting of polyamide (PA), ethylene methacrylic acid copolymer (EMA), and amorphous polyethylene terephthalate (APET).
- 10. The cover according to claim 5, wherein the support layer (9) includes a mixture of 40 to 80 wt-% crystalline polymer component and 20 to 60 wt-% amorphous polymer component.
- 11. The cover according to claim 8, wherein the heat-sealed layer (11) includes a mixture of about 20 wt-% styrene-modified ethylene copolymer and about 80 wt-% ethylene copolymer.
- 12. A cover in combination with a product package having an opening with a periphery along which said cover is to be heat-sealed, the cover comprising:
- a paper layer;
- a polymer heat-sealing layer removably heat sealed to the periphery of the opening of said package; and
- a non-curling polymer support layer impermeable to oxygen and having opposite sides disposed between said paper layer and said polymer heat-sealing layer, said polymer support layer comprising a mixture of a crystalline polymer component and an amorphous polymer component, in amounts preventing curling of said cover prior to heat sealing to said package.
- 13. The combination according to claim 12, wherein the non-curling polymer support layer includes a mixture of 20 to 90 wt-% crystalline polymer component and 20 to 80 wt-% amorphous polymer component.
- 14. The combination according to claim 13, wherein the crystalline polymer component is selected from the group consisting of polyamide (PA), polyethylene terephthalate (PET), polypropylene (PP), and ethyl vinyl alcohol copolymer (EVOH).
- 15. The combination according to claim 14, wherein the amorphous polymer component is selected from the group consisting of polyamide (PA), ethylene methacrylic acid copolymer (EMA), and amorphous polyethylene terephthalate (APET).
Priority Claims (1)
Number |
Date |
Country |
Kind |
942877 |
Jun 1994 |
FIX |
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Parent Case Info
This is a continuation of Ser. No. 08/471,067 filed Jun. 6, 1995 now abandoned.
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4927689 |
Markiewicz |
May 1990 |
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5449552 |
Bochow et al. |
Sep 1995 |
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Continuations (1)
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Number |
Date |
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Parent |
471067 |
Jun 1995 |
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