Claims
- 1. A non-foil lidding laminate comprising:
- a core layer comprising a void-bearing opalescent oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils;
- first and second outer balance layers having substantially the same thickness laminated to the opposite sides of the core layer, said first and second outer balance layers each comprising a nonvoid-bearing polyethylene terephthalate film having a thickness in the range of about 0.25 mils to about 1.5 mils, such thickness being sufficient to balance said core layer to prevent curling of said lidding laminate.
- 2. The lidding laminate of claim 1 including a heat seal layer applied to one of the outer balance layers.
- 3. The lidding laminate of claim 2, wherein said heat seal layer is a hot melt adhesive applied in a pattern to the exterior surface of one of said outer balance layers.
- 4. The lidding laminate of claim 3, wherein said pattern is diamond shaped.
- 5. The lidding laminate of claim 1 wherein said outer balance layers are biaxially oriented.
- 6. The lidding laminate of claim 1 wherein the outer balance layers are laminated to the core layer with a polyurethane laminating adhesive.
- 7. A non-foil lidding laminate for making a die-cut lid to be heat sealed to a polymeric container, said laminate comprising:
- a core layer comprising a void-bearing, opalescent, opaque, oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils;
- first and second outer balance layers having substantially the same thickness and being adhesively laminated to the opposite sides of the core layer, said first and second layers each comprising a nonvoid-bearing biaxially oriented polyethylene terephthalate film having a thickness in the range of about 0.25 to about 1.5 mils; and
- a heat seal layer applied to the exterior of one of the outer balance layers, said heat seal layer comprising a patterned hot melt adhesive for heat sealing a lid die-cut from the laminate to a polymeric container.
- 8. A non-foil lidding laminate comprising:
- a core layer comprising a void-bearing opalescent oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils, said core layer being the sole void-bearing layer in said laminate;
- first and second outer balance layers having substantially the same thickness laminated to the opposite sides of the core layer, said first and second outer balance layers each comprising a polyethylene terephthalate film having a thickness in the range of about 0.25 mils to about 1.5 mils.
- 9. A non-foil laminate for making a die-cut lid to be heat sealed to a polymeric container, said laminate comprising:
- a core layer comprising a void-bearing, opalescent, opaque, oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils, said core layer being the sole void-bearing layer in said laminate;
- first and second outer balance layers having substantially the same thickness and being adhesively laminated to the opposite sides of the core layer, said first and second layers each comprising a biaxially oriented polyethylene terephthalate film having a thickness in the range of about 0.25 to about 1.5 mils; and
- a heat seal layer applied to the exterior of one of the outer balance layers, said heat seal layer comprising a patterned hot melt adhesive for heat sealing a lid die-cut from the laminate to a polymeric container.
- 10. A non-foil lidding laminate comprising:
- a core layer comprising a void-bearing opalescent oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils;
- first and second outer balance layers having substantially the same thickness laminated to the opposite sides of the core layer, said first and second outer balance layers each comprising a nonvoid-bearing polyethylene terephthalate film having a thickness in the range of about 0.25 mils to about 1.5 mils, such thickness being sufficient to balance said core layer to prevent curling of said lidding laminate; and
- a layer of capacitor paper adhered to at least one of said outer balance layers.
- 11. A non-foil lidding laminate for making a die-cut lid to be heat sealed to a polymeric container, said laminate comprising:
- a core layer comprising a void-bearing, opalescent, opaque, oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils;
- first and second outer balance layers having substantially the same thickness and being adhesively laminated to the opposite sides of the core layer, said first and second layers each comprising a nonvoid-bearing biaxially oriented polyethylene terephthalate film having a thickness in the range of about 0.25 to about 1.5 mils;
- a layer of capacitor paper adhered to at least one of said outer balance layers; and
- a heat seal layer applied to the exterior of one of the outer balance layers, said heat seal layer comprising a patterned hot melt adhesive for heat sealing a lid die-cut from the laminate to a polymeric container.
- 12. A non-foil lidding laminate comprising:
- a core layer comprising a void-bearing opalescent oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils, said core layer being the sole void-bearing layer in said laminate;
- first and second outer balance layers having substantially the same thickness laminated to the opposite sides of the core layer, said first and second outer balance layers each comprising a polyethylene terephthalate film having a thickness in the range of about 0.25 mils to about 1.5 mils; and
- a layer of capacitor paper adhered to at least one of said outer balance layers.
- 13. A non-foil laminate for making a die-cut lid to be heat sealed to a polymeric container, said laminate comprising:
- a core layer comprising a void-bearing, opalescent, opaque, oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils, said core layer being the sole void-bearing layer in said laminate;
- first and second outer balance layers having substantially the same thickness and being adhesively laminated to the opposite sides of the core layer, said first and second layers each comprising a biaxially oriented polyethylene terephthalate film having a thickness in the range of about 0.25 to about 1.5 mils;
- a layer of capacitor paper adhered to at least one of said outer balance layers; and
- a heat seal layer applied to the exterior of one of the outer balance layers, said heat seal layer comprising a patterned hot melt adhesive for heat sealing a lid die-cut from the laminate to a polymeric container.
- 14. A lidding laminate comprising:
- a core layer comprising a void-bearing opalescent oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils;
- first and second outer balance layers having substantially the same thickness laminated to the opposite sides of the core layer, said first and second outer balance layers each comprising a nonvoid-bearing polyethylene terephthalate film having a thickness in the range of about 0.25 mils to about 1.5 mils, such thickness being sufficient to balance said core layer to prevent curling of said lidding laminate, and wherein at least one of said outer balance layers is metallized.
- 15. A lidding laminate for making a die-cut lid to be heat sealed to a polymeric container, said laminate comprising:
- a core layer comprising a void-bearing, opalescent, opaque, oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils;
- first and second outer balance layers having substantially the same thickness and being adhesively laminated to the opposite sides of the core layer, said first and second layers each comprising a nonvoid-bearing biaxially oriented polyethylene terephthalate film having a thickness in the range of about 0.25 to about 1.5 mils, and wherein at least one of said outer balance layers is metallized; and
- a heat seal layer applied to the exterior of one of the outer balance layers, said heat seal layer comprising a patterned hot melt adhesive for heat sealing a lid die-cut from the laminate to a polymeric container.
- 16. A lidding laminate comprising:
- a core layer comprising a void-bearing opalescent oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils, said core layer being the sole void-bearing layer in said laminate;
- first and second outer balance layers having substantially the same thickness laminated to the opposite sides of the core layer, said first and second outer balance layers each comprising a polyethylene terephthalate film having a thickness in the range of about 0.25 mils to about 1.5 mils, wherein at least one of said outer balance layers is metallized.
- 17. A laminate for making a die-cut lid to be heat sealed to a polymeric container, said laminate comprising:
- a core layer comprising a void-bearing, opalescent, opaque, oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils, said core layer being the sole void-bearing layer in said laminate;
- first and second outer balance layers having substantially the same thickness and being adhesively laminated to the opposite sides of the core layer, said first and second layers each comprising a biaxially oriented polyethylene terephthalate film having a thickness in the range of about 0.25 to about 1.5 mils, wherein at least one of said outer balance layers is metallized; and
- a heat seal layer applied to the exterior of one of the outer balance layers, said heat seal layer comprising a patterned hot melt adhesive for heat sealing a lid die-cut from the laminate to a polymeric container.
- 18. A non-foil lidding laminate comprising:
- a core layer comprising a void-bearing opalescent oriented polypropylene film having a thickness in the range of about 1.5 to about 7.0 mils;
- first and second outer balance layers having substantially the same thickness laminated to the opposite sides of the core layer, said first and second outer balance layers each comprising a nonvoid-bearing polyethylene terephthalate film having a thickness in the range of about 0.25 mils to about 1.5 mils, such thickness being sufficient to balance said core layer to prevent curling of said lidding laminate,
- said core layer thickness and said balance layer thicknesses selected so as to cooperate to form a structure having sufficient stiffness to be suitable as a lidding laminate.
Parent Case Info
This is a continuation-in-part of copending application Ser. No. 07/746,257, filed Aug. 15, 1991, now abandoned.
US Referenced Citations (17)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
746257 |
Aug 1991 |
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