초록 ▼

A can end member has a central panel, a circumferential chuckwall, and a transition wall. The central panel is centered about a longitudinal axis and has a peripheral edge. The curl defines an outer perimeter of the end member. The circumferential chuckwall extends downwardly from the curl to the tr

A can end member has a central panel, a circumferential chuckwall, and a transition wall. The central panel is centered about a longitudinal axis and has a peripheral edge. The curl defines an outer perimeter of the end member. The circumferential chuckwall extends downwardly from the curl to the transition wall. The transition wall connects the chuckwall with the peripheral edge of the central panel. The transition wall has a folded portion extending outwardly relative to the longitudinal axis.

대표청구항 ▼

We claim: 1. An easy open can end member comprising: a central panel positioned about a longitudinal axis, the central panel including a closure member for sealing the end member, a portion of the closure member is retainable to a portion of the central panel once the easy open can end member is op

We claim: 1. An easy open can end member comprising: a central panel positioned about a longitudinal axis, the central panel including a closure member for sealing the end member, a portion of the closure member is retainable to a portion of the central panel once the easy open can end member is opened; a curl defining an outer perimeter of the end member; a circumferential chuckwall extending downwardly from the curl; and a fold directly connected to the chuckwall and joining the chuckwall with the central panel. 2. The easy open can end member of claim 1 wherein the fold extends outwardly relative to the longitudinal axis. 3. The easy open can member of claim 2 wherein the fold further extends upwardly relative to the central panel. 4. The easy open can member of claim 1 wherein the fold has a length less than a length of the curl. 5. The easy open can member of claim 1 wherein the chuckwall extends downwardly from the curl at an obtuse angle and the fold has a thickness that is less than a length of the chuckwall. 6. The easy open can member of claim 1 wherein the fold comprises an annular concave bend extending downwardly from the chuckwall and an annular convex bend extending upwardly from the annular concave bend and interconnected to the central panel. 7. The easy open can end member of claim 6 wherein the fold further comprises a third bend joining the annular convex bend with the central panel. 8. The easy open can end member of claim 7 wherein the third bend has a radius of curvature substantially defined by a lower extent of the annular concave bend. 9. The easy open can end member of claim 1 wherein the fold includes an annular concave portion in engagement with the peripheral edge of the central panel. 10. The easy open can end member of claim 9 wherein the concave annular portion includes an apex, the apex being in engagement with the peripheral edge of the central panel. 11. The easy open can end member of claim 1 wherein the fold further extends upwardly relative to the central panel, the fold having a thickness which is substantially less than a length of the chuckwall. 12. The easy open can end member of claim 1 wherein the closure member comprises a tear panel defined by fracturable score, the tear panel retained to the central panel along a non-scored hinge region. 13. The easy open can end member of claim 1 wherein the central panel further comprises an aperture defined by a flange, and the closure member comprises a flexible metal foil peelably bonded to a portion of the flange. 14. The easy open can end member of claim 13 wherein the flange includes a frustoconical annular surface projecting upwardly from the central panel, the frustoconical annular surface having an upwardly sloping outer surface and an annular inner edge lying substantially in a plane and defining the aperture. 15. The easy open can end member of claim 14 wherein the frustoconical annular surface slopes upwardly at an angle between about 12.5째 and about 30째 to the central panel. 16. The easy open can end member of claim 15 wherein the closure member comprises a metal foil, the closure member extending entirely over the aperture and peelably bonded to the frustoconical annular surface around said aperture. 17. The easy open can end member of claim 16 wherein the closure member is bonded to have a tear/shear force resistance of at least about 25 lb./in. 18. The easy open can end member of claim 17 wherein the tear/shear force resistance is between about 25 and about 75 lb./in. 19. The easy open can end member of claim 16 wherein the closure member material is deformable, and wherein an average diameter of the aperture, the angle of slope of the flange, and the deformability of the material are mutually selected such that the closure member, when subjected to differential pressures up to at least about 90 p.s.i. in the can, bulges upwardly with an arc of curvature such that a line tangent to said arc at said inner edge of said flange lies at an angle to said plane not substantially greater than said angle of slope of the flange outer surface. 20. The easy open can end member of claim 16 wherein the closure member material is deformable, and wherein the average diameter of the aperture, the angle of slope of the flange, and the deformability of the material are mutually selected such that the closure member, when subjected to differential pressures up to at least about 100 p.s.i. in the can, bulges upwardly with an arc of curvature such that a line tangent to the arc at the inner edge of the flange lies at an angle to the plane not substantially greater than the angle of slope of the flange outer surface. 21. The easy open can end member of claim 16 wherein the closure member and the heat seal have a tear/shear force resistance of at least about 75 lb./in., and wherein the average diameter of the aperture and the angle of slope of the flange are mutually selected such that when the closure member is subjected to differential pressure of not more than about 90 p.s.i. within the can, the tear/shear force exerted on the closure member and heat seal does not exceed said tear/shear force resistance. 22. The easy open can end member of claim 16 wherein the closure member and the heat seal have a tear/shear force resistance of at least about 75 lb./in., and wherein the average diameter of the aperture and the angle of slope of the flange are mutually selected such that when the closure member is subjected to differential pressure of not more than about 100 p.s.i. within the can, the tear/shear force exerted on the closure member and heat seal does not exceed the tear/shear force resistance. 23. The easy open can end member of claim 22 wherein the closure member and the heat seal have a tear/shear force resistance of at least about 75 lb./in., and wherein the average diameter of said aperture and said angle of slope of the flange are mutually selected such that when the closure member is subjected to differential pressure of not more than about 90 p.s.i. within the can, the tear/shear force exerted on the closure member and the heat seal does not exceed the tear/shear force resistance. 24. The easy open can end member of claim 23 wherein the closure member and the heat seal have a tear/shear force resistance of at least about 75 lb./in., and wherein the average diameter of the aperture and the angle of slope of the flange are mutually selected such that when the closure member is subjected to differential pressure of not more than about 100 p.s.i. within the can, the tear/shear force exerted on the closure member and heat seal does not exceed the tear/shear force resistance. 25. The easy open can end member of claim 16 wherein the heat seal has a 90째 peel strength between about 8 N and about 20 N. 26. The easy open can end member of claim 16 wherein the annular inner edge is formed with a reverse bead curl. 27. The easy open can end member of claim 26 wherein the reverse bead curl is substantially tangent to the upwardly sloping outer surface of the flange. 28. The easy open can end member of claim 16 wherein the metal foil is aluminum alloy foil. 29. The easy open can end member of claim 28 wherein the aluminum alloy foil has a thickness between about 0.003 inch and about 0. 004 inch. 30. The easy open can end member of claim 16 wherein the heat seal is formed as an annulus surrounding the aperture and having a width between about 0.079 inch and about 0.118 inch. 31. The easy open can end member of claim 16 wherein the closure has a tab portion with a manually graspable free end and an extension overlying said central panel in opposed relation to the tab portion, said heat seal including an annulus surrounding the aperture and a further seal portion bonding the extension to the central panel lid such that the peel force required to separate the extension from the central panel lid is greater than that required to separate the closure member from the central panel at the annulus, whereby the aperture can be opened by peeling back the closure member while the closure member remains secured to the lid by the further seal portion. 32. The easy open can end member of claim 31 including a fragrance-providing material disposed between the closure member and the central panel and surrounded by the heat seal such that when the closure member is subjected to a peel force effective to open the aperture, the fragrance-providing material becomes exposed. 33. The easy open can end member of claim 16 including a fragrance-providing material disposed between the closure member and the central panel and surrounded by the heat seal such that when the closure member is subjected to a peel force effective to open the aperture, the body of fragrance-providing material becomes exposed. 34. An easy open can end member comprising: a central panel centered about a longitudinal axis, the central panel having a peripheral edge; a curl defining an outer perimeter of the end member; a circumferential chuckwall extending downwardly from the curl; and a transition wall connecting the chuckwall with the peripheral edge of the central panel, the transition wall comprising a folded portion comprising a convex annular apex joining a first leg and a second leg, the first leg joining the transition wall with the chuckwall, and the second leg joining the transition wall with the peripheral edge, the convex annular apex located outwardly of a lower portion of the chuckwall. 35. The easy open can end member of claim 34 wherein the central panel includes a stepped-profile along the peripheral edge, the stepped-profile having an upwardly directed concave annular portion integral with an upwardly annular convex portion which is interconnected with the folded portion. 36. An easy open can end member including a stay-on closure member comprising: a central panel centered about a longitudinal axis having a public side and a product side; a curl defining an outer perimeter of the end member; a circumferential chuckwall extending downwardly from the curl; and a transition wall connecting the chuckwall with the peripheral edge of the central panel, the transition wall comprising a fold including a concave annular portion extending downwardly and approaching the peripheral edge of the public side of the central panel. 37. An end member for a container comprising: a central panel positioned about a longitudinal axis; a curl defining an outer perimeter of the end member, the curl having an upper extent located a first distance above the central panel; and a circumferential chuckwall extending upwardly from the central panel at an angle from a vertical line, the chuckwall including a lower portion having a radius of curvature wherein the curl is located at a second distance above an uppermost segment of the lower portion and the first distance is expressed using the following relationship: L CP=Hcurl+RCW(cos θ+sin ψ) L CP=Hcurl+RCW(cos θ-sin ψ) wherein LCP is the first distance, Hcurl is the second distance, RCW is the radius if curvature of the lower portion of the chuckwall, the angle ψ is the angle between the lower portion of the chuckwall and the vertical line, and the angle θ is an angle measured between a line perpendicular to the longitudinal axis and the uppermost segment of the lower portion of the chuckwall. 38. The end member of claim 37 wherein LCP is between 0.180 in. to 0.240 in. 39. The end member of claim 37 wherein the central panel has a diameter between 1.380 in. to 1.938 in. 40. The end member of claim 37 wherein RCW is between 0.085 in. to 0.205 in. 41. An easy open can end member comprising: a central panel positioned about a longitudinal axis, the central panel including a closure member for sealing the end member, a portion of the closure member is retainable to a portion of the central panel once the easy open can end member is opened; a curl defining an outer perimeter of the end member; a circumferential chuckwall extending downwardly from the curl; and a fold located between the chuckwall and the central panel, the fold extending radially outwardly of a lower portion of the chuckwall.