Insulative container
View Patent ↗An insulated sleeve is provided to be coupled to an outer surface of a cup. The sleeve is formed from an insulative cellular non-aromatic polymeric material having an area of plastic deformation. There are no fractures in the insulative cellular non-aromatic polymeric material so that a predetermined insulative characteristic is maintained in the material.
1. An insulative sleeve for surrounding and embracing an exterior surface of a hot-beverage drink cup to provide a grippable low-temperature thermal barrier that can be gripped by a consumer, the sleeve comprising a sheet comprising insulative cellular non-aromatic polymeric material having localized plastic deformation in the sheet having a plastically deformed first material segment having a first density located in a first portion of the sheet and a second material segment having a second density lower than the first density located in an adjacent second portion of the sheet without fracturing the insulative cellular non-aromatic polymeric material so that a predetermined insulative characteristic is maintained in the sheet,
wherein the insulative cellular non-aromatic polymeric material comprises a polypropylene base resin, at least one nucleation agent, and at least one blowing agent configured to expand the polypropylene base resin to reduce density, and
wherein the insulative cellular non-aromatic polymeric material further comprises a polypropylene secondary resin.
2. The insulative sleeve of claim 1 , wherein the sleeve is arranged to surround a vertical central axis and includes an upright inner tab arranged to extend upwardly along and in spaced-apart relation to the vertical central axis and is configured to provide the first material segment having the first density, an upright outer tab arranged to extend upwardly along and in spaced-apart relation to the vertical central axis and arranged to mate with the upright inner tab along an interface therebetween, and an upright fence arranged to interconnect the upright inner and outer tabs and surround the vertical central axis and configured to provide the second material segment having the second density and cooperate with the upright inner and outer tabs to form the sleeve.
3. The insulative sleeve of claim 2 , wherein the upright inner tab includes an inner surface and an outer surface facing toward the upright outer tab, the upright outer tab includes an inner surface mating with the outer surface of the upright inner tab to define the interface between the upright inner and outer tabs, and the upright outer tab further includes an outer face facing away from the upright inner tab.
4. The insulative sleeve of claim 3 , wherein each of the inner and outer surfaces of the upright inner and outer tabs has an arcuate shape in a horizontal cross-section and subtends an acute angle of less than 20 degrees.
5. The insulative sleeve of claim 2 , wherein the upright fence includes an upright left side edge and an upright right side edge arranged to lie in spaced-apart confronting relation to the upright left side edge and the upright outer tab is configured to have the first density and mate with the upright inner tab to establish a bridge arranged to interconnect the upright left and right side edges of the upright fence and is formed of plastically deformed material having the first density.
6. The insulative sleeve of claim 2 , wherein the upright fence has an inner surface facing toward the vertical central axis and an outer surface facing away from the vertical central axis and surrounding the inner surface of the upright fence and cooperating with the inner surface of the upright fence to define a first thickness therebetween, the upright inner tab includes an inner surface facing toward the vertical central axis and an outer surface facing toward the upright outer tab, the upright outer tab includes an inner surface facing toward the vertical central axis and mating with the outer surface of the upright inner tab to define the interface between the upright inner and outer tabs, and the upright outer tab further includes an outer face facing away from the upright inner tab, the inner and outer surfaces of the upright inner tab cooperate to define a second thickness therebetween that is about half of the first thickness, and the inner and outer surfaces of the upright outer tab cooperate to define a third thickness that is about half of the first thickness.
7. The insulative sleeve of claim 6 , wherein the insulative cellular non-aromatic polymeric material has no fractures so that a predetermined insulative characteristic is maintained in the material.
8. The insulative sleeve of claim 2 , wherein the sleeve further comprises a cellular non-aromatic graphics skin coupled to the insulative cellular non-aromatic polymeric material.
9. The insulative sleeve of claim 8 , wherein the sleeve further comprises an adhesive interposed between the graphics skin and the insulative cellular non-aromatic polymeric material.
10. The insulative sleeve of claim 9 , wherein ink is printed on the graphics skin to provide a graphic design.
11. The insulative sleeve of claim 8 , wherein the graphics skin is biaxially oriented polypropylene.
12. The insulative sleeve of claim 8 , wherein the strip of insulative cellular non-aromatic polymeric material has cells having an average cell aspect ratio in at least one direction in a range of about 1.0 to about 3.0.
13. The insulative sleeve of claim 12 , wherein the second density is in a range of about 0.01 g/cm 3 to about 0.19 g/cm 3 .
14. The insulative sleeve of claim 1 , wherein the sleeve is arranged to surround a vertical central axis and includes an upright inner tab arranged to extend upwardly along and in spaced-apart relation to the vertical central axis and is configured to provide the first material segment having the first density, an upright outer tab arranged to extend upwardly along and in spaced-apart relation to the vertical central axis and arranged to mate with the upright inner tab along an interface therebetween, and an upright fence arranged to interconnect the upright inner and outer tabs and surround the vertical central axis and configured to provide the second material segment having the second density and cooperate with the upright inner and outer tabs to form the sleeve, wherein the sleeve further comprises a cellular non-aromatic graphics skin coupled to the insulative cellular non-aromatic polymeric material, and wherein the blowing agent comprises at least one of carbon dioxide, pentane, butane, and nitrogen.
15. The insulative sleeve of claim 14 , wherein the polypropylene base resin is a polypropylene homopolymer resin.
16. The insulative sleeve of claim 15 , further comprising a polypropylene secondary resin that is a polypropylene homopolymer resin.
17. The insulative sleeve of claim 15 , further comprising a polypropylene secondary resin that is a polypropylene copolymer resin.
18. The insulative sleeve of claim 15 , wherein the sheet of insulative cellular non-aromatic polymeric material has cells having an average cell aspect ratio in at least one direction in a range of about 1.0 to about 3.0.
19. The insulative sleeve of claim 18 , wherein the second density is in a range of about 0.01 g/cm 3 to about 0.19 g/cm 3 .
20. The insulative sleeve of claim 19 , wherein the sleeve is arranged to surround a vertical central axis and includes an upright inner tab arranged to extend upwardly along and in spaced-apart relation to the vertical central axis and is configured to provide the first material segment having the first density, an upright outer tab arranged to extend upwardly along and in spaced-apart relation to the vertical central axis and arranged to mate with the upright inner tab along an interface therebetween, and an upright fence arranged to interconnect the upright inner and outer tabs and surround the vertical central axis and configured to provide the second material segment having the second density and cooperate with the upright inner and outer tabs to form the sleeve, and
wherein the upright fence has an inner surface facing toward the vertical central axis and an outer surface facing away from the vertical central axis and surrounding the inner surface of the upright fence and cooperating with the inner surface of the upright fence to define a first thickness therebetween, the upright inner tab includes an inner surface facing toward the vertical central axis and an outer surface facing toward the upright outer tab, the upright outer tab includes an inner surface facing toward the vertical central axis and mating with the outer surface of the upright inner tab to define the interface between the upright inner and outer tabs, and the upright outer tab further includes an outer face facing away from the upright inner tab, the inner and outer surfaces of the upright inner tab cooperate to define a second thickness therebetween that is about half of the first thickness, and the inner and outer surfaces of the upright outer tab cooperate to define a third thickness that is about half of the first thickness.
21. The insulative sleeve of claim 1 , wherein the blowing agent comprises at least one of carbon dioxide, pentane, and butane.
22. The insulative sleeve of claim 1 , wherein the polypropylene base resin is a polypropylene homopolymer resin, the polypropylene base resin comprises broadly distributed molecular weight polypropylene characterized by a distribution that is unimodal, and the polypropylene base resin is characterized by long-chain branching to provide a predetermined balance of processability and elasticity.
23. The insulative sleeve of claim 1 , wherein the polypropylene secondary resin is a polypropylene homopolymer resin.
24. The insulative sleeve of claim 1 , wherein the polypropylene secondary resin is a polypropylene copolymer resin.
25. The insulative sleeve of claim 1 , wherein the sheet of insulative cellular non-aromatic polymeric material has cells having an average cell aspect ratio in at least one direction in a range of about 1.0 to about 3.0.
26. The insulative sleeve of claim 1 , wherein the second density is in a range of about 0.01 g/cm 3 to about 0.19 g/cm 3 .
27. The insulative sleeve of claim 26 , wherein the second density is in a range of about 0.05 g/cm 3 to about 0.19 g/cm 3 .
28. The insulative sleeve of claim 27 , wherein the sleeve is arranged to surround a vertical central axis and includes an upright inner tab arranged to extend upwardly along and in spaced-apart relation to the vertical central axis and is configured to provide the first material segment having the first density, an upright outer tab arranged to extend upwardly along and in spaced-apart relation to the vertical central axis and arranged to mate with the upright inner tab along an interface therebetween, and an upright fence arranged to interconnect the upright inner and outer tabs and surround the vertical central axis and configured to provide the second material segment having the second density and cooperate with the upright inner and outer tabs to form the sleeve, and
wherein the upright fence has an inner surface facing toward the vertical central axis and an outer surface facing away from the vertical central axis and surrounding the inner surface of the upright fence and cooperating with the inner surface of the upright fence to define a first thickness therebetween, the upright inner tab includes an inner surface facing toward the vertical central axis and an outer surface facing toward the upright outer tab, the upright outer tab includes an inner surface facing toward the vertical central axis and mating with the outer surface of the upright inner tab to define the interface between the upright inner and outer tabs, and the upright outer tab further includes an outer face facing away from the upright inner tab, the inner and outer surfaces of the upright inner tab cooperate to define a second thickness therebetween that is about half of the first thickness, and the inner and outer surfaces of the upright outer tab cooperate to define a third thickness that is about half of the first thickness.