Closures and vessels with closures

1. An apparatus comprising:

a vessel comprising an outlet that comprises:

a rim; and

a first cavity that extends from the rim and comprises an interior surface comprising an inner diameter; and

a closure comprising:

a base portion; and

a male portion that extends from the base portion to form a second cavity and that comprises:

a first portion that extends circumferentially about the second cavity and has a first outer diameter that is larger than the inner diameter when the closure is in a relaxed state, said relaxed state comprising the apparatus in an open configuration with the male portion disposed outside the first cavity;

a second portion that extends circumferentially about the second cavity and has a second outer diameter that is no larger than the inner diameter when the closure is in said relaxed state; and

a third portion that extends circumferentially about the second cavity, is tapered, and is disposed between the first portion and the second portion,

wherein the first portion is disposed between the third portion and the base portion, and

wherein the closure is dimensioned so that when the male portion is inserted in the first cavity with the base portion adjoining the rim, the interior surface of the vessel applies radial compressive force to the first portion that causes the second portion to flare out relative to said relaxed state, said flare out comprising diametrical expansion of the second portion relative to said second outer diameter, said diametrical expansion producing lateral force between the second portion and the interior surface causing the second portion to engage the interior surface and produce a self-energizing seal.

2. The apparatus of claim 1 , wherein the inner diameter is larger than the second outer diameter when the closure is in said relaxed state, and

wherein the interior surface comprises a circumferentially extending projection that is disposed adjacent the rim.

3. The apparatus of claim 1 , wherein the male portion is disposed in the first cavity with the base portion adjoining the rim,

wherein as a result of said interference, the second portion flares out, engages the interior surface, and produces said self-energizing seal, and

wherein the interior surface, the second portion, and the third portion form an enclosed space that extends circumferentially about the second cavity.

4. The apparatus of claim 1 , wherein the male portion comprises a continuous taper that comprises the first portion, the second portion, and the third portion.

5. The apparatus of claim 1 , wherein both the vessel and the closure are formed together, integrally, of a single piece of material with a composition comprising a common polymer.

6. The apparatus of claim 1 , wherein the interior surface of the first cavity comprises pressure venting channels adjacent the rim.

7. The apparatus of claim 1 , wherein the rim comprises a curved contour,

wherein with the apparatus in a closed configuration with the male portion extending into the first cavity, the apparatus further comprises the self-energizing seal,

wherein the self-energizing seal comprises an enclosed gap formed between the male portion and the interior surface, and

wherein the curved contour and the enclosed gap comprise a pressure venting path.

8. The apparatus of claim 1 , wherein the closure and the vessel are arranged so that the male portion extends into the first cavity, with the first portion, the second portion, and the third portion disposed in the first cavity,

wherein the male portion and the interior surface form the self-energizing seal, a second seal, and an enclosed gap, and

wherein the enclosed gap is disposed between the self-energizing seal and the second seal.

9. The apparatus of claim 1 , wherein the vessel is formed of a first unitary piece of material of a composition comprising a polymer, and

wherein the closure is formed of a second unitary piece of material of the composition comprising the polymer.

10. The apparatus of claim 1 , wherein each of the vessel and the closure comprises polyethylene terephthalate.

11. The apparatus of claim 1 , wherein the vessel and the closure are composed of polyethylene terephthalate.

12. The apparatus of claim 1 , wherein the first portion adjoins the base.

13. The apparatus of claim 12 , wherein the third portion adjoins the first portion.

14. The apparatus of claim 13 , wherein the second portion adjoins the third portion.

15. The apparatus of claim 1 , wherein a distal portion of the second portion comprises said self-energizing seal,

wherein the first portion extends along an axis of the apparatus away from the base and to the third portion,

wherein the third portion extends along the axis, from the first portion to the second portion, and

wherein the second portion extends along the axis, from the third portion to the distal portion.

16. The apparatus of claim 1 , wherein each of the vessel and the closure comprises polyethylene terephthalate,

wherein in the closed configuration, the male portion and the interior surface form the self-energizing seal, a second seal, and an enclosed gap, and

wherein the enclosed gap is disposed between the self-energizing seal and the second seal.

17. An apparatus comprising:

a vessel comprising an outlet that comprises:

a rim; and

a first cavity that extends from the rim and comprises an interior surface comprising an inner diameter;

a closure comprising:

a base portion; and

a male portion that extends from the base portion to form a second cavity and that comprises:

a first portion that extends circumferentially about the second cavity;

a second portion that extends circumferentially about the second cavity; and

a third portion that extends circumferentially about the second cavity, is tapered, and is disposed between the first portion and the second portion;

a closed configuration in which each of the first portion, the second portion, and the third portion extends into the first cavity; and

an open configuration in which each of the first portion, the second portion, and the third portion is disposed outside the first cavity,

wherein in the open configuration, the first portion has a first outer diameter that is larger than the inner diameter and the second portion has a second outer diameter that is no larger than the inner diameter, and

wherein in the closed configuration, the interior surface of the outlet diametrically compresses the first portion, produces radial compressive forces and deformation, and causes the first portion to have a third outer diameter that is smaller than the first outer diameter, wherein said radial compressive forces and deformation cause the second portion to press radially outward against the interior surface and form a self-energizing seal.

18. The apparatus of claim 17 , wherein in the open configuration, the second outer diameter is smaller than the inner diameter, and wherein in the closed configuration, the second portion has a fourth outer diameter that comprises the inner diameter of the interior surface of the outlet.

19. An apparatus comprising:

a vessel comprising an outlet that comprises:

a rim; and

an interior surface that extends from the rim and defines a cavity; and

a closure comprising:

a base portion; and

a male portion that extends from the base portion and comprises:

a distally disposed undersized portion;

a proximally disposed oversized portion; and

a tapered portion disposed between the undersized and oversized portions,

wherein an annular space exists between the distally disposed undersized portion and the interior surface when the distally disposed undersized portion is disposed in the cavity and the proximally disposed oversized portion and the tapered portion are disposed outside the cavity, and

wherein when the distally disposed undersized portion, the proximally disposed oversized portion, and the tapered portion are disposed in the cavity, the proximally disposed oversized portion receives radial compressive force from the interior surface that causes the distally disposed undersized portion to diametrically expand into the annular space, press radially outward against the interior surface, and form a seal with the interior surface.

20. The apparatus of claim 19 , wherein the seal comprises a self-energizing seal, and

wherein the vessel comprises inorganic material and the closure comprises thermoplastic material.