TWO-STAGE CONTAINER BASE

Abstract

A blow-molded container including a finish and a base. The finish defines an opening at a first end of the container that provides access to an internal volume. The base includes a diaphragm and a standing surface. The diaphragm extends radially outward from a central push-up portion. The standing surface of the container is at a second end of the container. In response to an internal vacuum caused by hot-filling and closing the container, the diaphragm is configured to move passively from an as-blown first configuration to a second configuration in which the diaphragm is closer to the first end of the container as compared to the as-blown first configuration. The diaphragm is configured to move from the second configuration to an activated third configuration in which the diaphragm is closer to the first end of the container in response to the diaphragm being externally actuated by a tool.

Claims

1. A blow-molded container comprising: a finish defining an opening at a first end of the container that provides access to an internal volume defined by the container; and a base portion including: a diaphragm extending radially outward from a central push-up portion through which a longitudinal axis of the container extends; and a standing surface of the container at a second end of the container that is opposite to the first end; wherein: in response to an internal vacuum caused by hot-filling and closing the container, the diaphragm is configured to move passively from an as-blown first configuration to a second configuration in which the diaphragm is closer to the first end of the container as compared to the as-blown first configuration; and the diaphragm is configured to move from the second configuration to an activated third configuration in which the diaphragm is closer to the first end of the container as compared to the second configuration in response to the diaphragm being externally actuated by a tool.

2. The blow-molded container of claim 1, wherein the diaphragm is concave relative to the standing surface of the container in the as-blown first configuration, and the diaphragm is convex relative to the standing surface of the container in the activated third configuration.

3. The blow-molded container of claim 1, wherein the diaphragm is convex relative to the external standing surface of the container in the as-blown first configuration, and the diaphragm is concave relative to the external standing surface of the container in the activated third configuration.

4. The blow-molded container of claim 1, further comprising an upstanding wall extending from the standing surface towards the first end of the container, the upstanding wall is angled away from a sidewall of the container and towards the central push-up portion; wherein at least a portion of the upstanding wall is configured to move towards the sidewall and subsequently away from the sidewall as the base portion moves from the second configuration to the third configuration

5. The blow-molded container of claim 4, wherein the base portion further includes a hinge between the upstanding wall and the diaphragm, at least a portion of the hinge is configured to move towards the sidewall of the container and subsequently away from the sidewall of the container as the base portion moves from the second configuration to the third configuration.

6. The blow-molded container of claim 1, further comprising an isolation rib circumscribing the central push-up portion and protruding outward from the base portion away from the first end of the container.

7. The blow-molded container of claim 1, wherein the container has a ratio of diaphragm diameter to inversion height of the base portion defined between the standing surface and a peak of the diaphragm in the as-blown first configuration of greater than about 6:1.

8. The blow-molded container of claim 1, wherein the diaphragm includes dimples recessed therein relative to the second end of the container.

9. The blow-molded container of claim 1, wherein the diaphragm continuously curves outward away from the longitudinal axis and the central push-up portion in the as-blown first configuration.

10. The blow-molded container of claim 1, wherein the diaphragm extends linearly outward away from the longitudinal axis and the central pushup portion in the as-blown first configuration.

11. A blow-molded container comprising: a finish defining an opening at a first end of the container that provides access to an internal volume defined by the container; and a base portion at a second end of the container opposite to the first end, the base portion including: an external standing surface of the container at an outer diameter of the base portion; an upstanding wall extending from the external standing surface towards the first end of the container and angled inward away from a sidewall of the container; a central push-up portion at a center of the base portion, a longitudinal axis of the container extends through the central push-up portion; a diaphragm extending between the upstanding wall and the central push-up portion; and a hinge where the diaphragm mates with the upstanding wall; wherein: subsequent to the container being hot-filled an internal vacuum within the container draws the diaphragm from an as-blown first configuration towards the first end of the container to a second configuration; and in response to an external actuation force applied to the diaphragm when in the second configuration, the diaphragm moves from the second configuration to an activated third configuration, the diaphragm is closer to the first end of the container in the activated third configuration as compared to the second configuration.

12. The blow-molded container of claim 11, wherein the diaphragm is concave relative to the external standing surface of the container in the as-blown first configuration, and the diaphragm is at least partially convex relative to the standing surface of the container in the activated third configuration.

13. The blow-molded container of claim 12, wherein the diaphragm is devoid of flat and convex portions in the as-blown first configuration.

14. The blow-molded container of claim 13, wherein the upstanding wall is integrated with the diaphragm.

15. The blow-molded container of claim 11, wherein the diaphragm is convex relative to the external standing surface of the container in the as-blown first configuration, and the diaphragm is concave relative to the standing surface of the container in the activated third configuration.

16. The blow-molded container of claim 11, further comprising an isolation rib circumscribing the central push-up portion and protruding outward from the base portion away from the first end of the container.

17. The blow-molded container of claim 11, wherein the hinge is stationary as the central push-up portion and the diaphragm move towards the first end of the container.

18. The blow-molded container of claim 11, wherein the hinge and the upstanding wall are concave relative to the second end of the container in the as-blown first configuration.

19. The blow-molded container of claim 11, wherein the diaphragm changes shape as the diaphragm moves towards the first end of the container.

20. The blow-molded container of claim 11, wherein the base portion is configured such that the hinge moves towards the sidewall and then away from the sidewall as the base portion is moved from the second configuration to the activated third configuration by the external actuation force.

21. The blow-molded container of claim 11, wherein the base portion is configured such that the hinge remains stationary as the base portion is moved from the second configuration to the activated third configuration by the external actuation force.

22. The blow-molded container of claim 11, wherein the base portion is configured such that an angle of the upstanding wall relative to the sidewall remains constant as the base portion moves from the as-blown first configuration to the second configuration.

23. The blow-molded container of claim 11, wherein the upstanding wall is angled greater than about 20 away from the sidewall of the container towards the central push-up portion.

24. The blow-molded container of claim 11, wherein the container has a ratio of diaphragm diameter to inversion height of the base portion defined between the standing surface and a peak of the diaphragm in the as-blown first configuration of greater than about 6:1.

25. The blow-molded container of claim 11, wherein the diaphragm includes dimples recessed therein relative to the second end of the container.

26. The blow-molded container of claim 11, wherein the diaphragm continuously curves outward away from the longitudinal axis and the central push-up portion in the as-blown first configuration.

27. The blow-molded container of claim 11, wherein the diaphragm extends linearly outward away from the longitudinal axis and the central pushup portion in the as-blown first configuration.

28. A method for filling a blow-molded container comprising: hot-filling the container through an opening defining a finish at a first end of the container such that a base portion at a second end of the container passively moves from an as-blown first configuration to a second configuration in response to internal vacuum forces of the container, a diaphragm of the base portion is closer to the first end of the container in the second configuration than the as-blown first configuration; and applying external force to the base portion when the base portion is in the second configuration to move the base portion from the second configuration to an activated third configuration in which the base portion is closer to the first end of the container as compared to the second configuration.

29. The method of claim 28, further comprising applying the external force with an actuation tool.

30. The method of claim 28, further comprising forming the blow-molded container to have an isolation rib circumscribing the central push-up portion and protruding outward from the base portion away from the first end of the container.

31. The method of claim 28, wherein the container has a ratio of diaphragm diameter to inversion height of the base portion defined between the standing surface and a peak of the diaphragm in the as-blown first configuration of greater than about 6:1.

32. The method of claim 28, wherein moving the base portion from the second configuration to the third configuration moves the base portion from a convex shape to a concave shape relative to an exterior of the base portion.

33. The method of claim 28, wherein the diaphragm retains a concave shape relative to an exterior of the base portion as the diaphragm moves from the second configuration to the third configuration.

34. The method of claim 28, wherein an upstanding wall of the base portion moves towards and away from a sidewall of the container as the diaphragm moves from the second configuration to the third configuration.

35. The method of claim 28, further comprising forming the blow-molded container such that an upstanding wall extends from the external standing surface towards the first end of the container and is angled inward away from a sidewall of the container at an angle that is greater than about 20.

36. The method of claim 28, further comprising forming the blow-molded container such that the diaphragm includes dimples.

37. The method of claim 28, further comprising forming the blow-molded container such that the diaphragm is: continuously concave relative to an exterior of the base portion, and is devoid of flat or convex portions.

Description

DRAWINGS

[0014] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

[0015] FIG. 1 is a side view of a container according to the present teachings;

[0016] FIG. 2 is a plan view of a base portion of the container of FIG. 2;

[0017] FIG. 3A is a cross-sectional view of the base portion of the container of FIG. 1 in an as-blown configuration;

[0018] FIG. 3B is a cross-sectional view of the base portion of the container of FIG. 1 under internal vacuum force;

[0019] FIG. 3C is a cross-sectional view of the base portion of the container of FIG. 1 at a mid-point of activation, and FIG. 3C illustrates external actuation tooling configured to move the base inward to a full positive displacement position (activated position);

[0020] FIG. 3D is a cross-sectional view of the base portion of the container of FIG. 1 in the full positive displacement position (activated position);

[0021] FIG. 4A is a plan view of a base portion of another container according to the present teachings;

[0022] FIG. 4B is a cross-sectional view of the base portion of the container of FIG. 4A;

[0023] FIG. 5A is a plan view of a base portion of an additional container according to the present teachings;

[0024] FIG. 5B is a cross-sectional view of the base portion of the container of FIG. 5A;

[0025] FIG. 6A is a plan view of a base portion of yet another container according to the present teachings;

[0026] FIG. 6B is a cross-sectional view of the base portion of the container of FIG. 6A;

[0027] FIG. 7A is a plan view of a base portion of a further container according to the present teachings;

[0028] FIG. 7B is a cross-sectional view of the base portion of the container of FIG. 7A;

[0029] FIG. 8A is a plan view of a base portion of yet an additional container according to the present teachings;

[0030] FIG. 8B is a cross-sectional view of the base portion of the container of FIG. 8A;

[0031] FIG. 9A is a plan view of a base portion of still another container according to the present teachings;

[0032] FIG. 9B is a perspective view of the base portion of the container of FIG. 9A;

[0033] FIG. 9C is a cross-sectional view of the base portion of the container of FIGS. 9A and 9B;

[0034] FIG. 10A is a cross-sectional view of the base portion of the container of FIGS. 9A-9C showing the container in an as-blown configuration (phantom) and under internal vacuum force (solid lines);

[0035] FIG. 10B is a cross-sectional view of the base portion of the container of FIGS. 9A-9C showing the container in an as-blown configuration (phantom) and a full positive displacement position (activated position); and

[0036] FIG. 11 is a chart of exemplary diaphragm diameter (DD) to base inversion height (h) ratios for different containers according to the present teachings.

[0037] Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.

DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0039] Illustrated throughout the Figures are exemplary blow-molded containers 10, 110, 210, 310, 410, 510, and 610 according to the present teachings. The containers can be any suitable shape and size, such as 20 ounces for example. The containers can be made of any suitable material, such as any suitable blow-molded thermoplastic or bio-resin, including polyethylene terephthalate (PET), high density or low density polyethylene (HDPE, LDPE), polypropylene (PP), polyethylene naphthalate (PEN), a PET/PEN blend or copolymer, and the like, for example. The containers can be formed in any suitable manner, such as by stretch blow-molding.

[0040] The containers each include a lightweight container base portion 40, 140, 240, 340, 440, 540, and 640 for use with hot-fill product applications, such as juice, teas, enhanced water, and the like. As described herein, each of the base portions 40, 140, 240, 340, 440, 540, and 640 use at least two modes of operation to control vacuum and pressure within the filled container. A first mode provides for passive movement of the base under the forces of internal vacuum caused by the hot-fill process and subsequent cooling. A second mode is an active mode that includes application of external force to permanently form a base geometry into the container displacing internal volume to reduce or completely eliminate residual vacuum. Positive pressure in the container may also be achieved to help prevent and fix denting.

[0041] With initial reference to FIGS. 1 and 2, the present teachings provide for a container 10 including a first end 12 and a second end 14, which is opposite to the first end 12. At the first end 12 is a finish 16 defining an aperture 18, which provides access to an internal volume 22 of the container 10. The internal volume 22 of the container 10 is at least partially defined by a shoulder portion 24 and a body portion 26. One or more ribs 28A and 28B can be defined by a sidewall 30 of the container 10.

[0042] With continued reference to FIGS. 1 and 2, and additional reference to FIGS. 3A and 3B, at the second end 14 is a base portion 40. The base portion 40 includes a central push-up portion (also referred to as a center isolation post) 42, which can be at an axial center of the base portion 40. A longitudinal axis L of the container 10 can extend through a center of the push-up portion 42. The base portion 40 can be formed using a counter-stretch rod that is of a standard length or shorter, and over-stroke can be used to advantageously reduce weight of the base portion 40.

[0043] With particular reference to FIGS. 3A and 3B, the push-up portion 42 includes an angled portion (also referred to as an interfacial angled portion) 44, which extends to a diaphragm (also referred to as an inversion ring/radius) 50 of the base portion 40. The diaphragm 50 extends from the central push-up portion 42 to an upstanding wall (also referred to as a primary hemisphere wall) 52. The upstanding wall 52 extends from the diaphragm 50 to a standing surface 54 of the container 10. The base portion 40 generally provides a hinge (also referred to as a transitional radius) 56 where the upstanding wall 52 and the diaphragm 50 meet. An isolation radius 58 is where the diaphragm 50 and the angled portion 44 meet.

[0044] FIG. 3A illustrates the base portion 40 in an as-blown first configuration A. In this first configuration A the diaphragm 50 is curved and is generally convex relative to an exterior of the container 10, such as convex relative to the external standing surface 54 of the container 10. The upstanding wall 52 is angled away from the sidewall 30 towards the longitudinal axis L. The upstanding wall 52 can be at any suitable angle, such as about 30. For example, the upstanding wall 52 can be angled towards the longitudinal axis L from about 15 to about 45. Thus, the upstanding wall 52 can be angled greater than 20 relative to the longitudinal axis L. The upstanding wall 52 is also less than about 0.34 inches tall as measured from the standing surface 54.

[0045] After the container 10 is hot-filled and allowed to cool, an internal vacuum within the container 10 will passively draw the base portion 40 inward towards the first end 12 and to the second configuration B illustrated in FIG. 3B. Specifically, the central push-up portion 42 is drawn along the longitudinal axis L towards the first end 12. The diaphragm 50 also moves towards the first end 12. The diaphragm 50 moves most at the portion thereof proximate to the push-up portion 42. At the hinge portion 56, the diaphragm 50 moves the least, or not at all. A curve radius of the diaphragm 50 is reduced or becomes smaller, and an angle between the upstanding wall 52 and the sidewall 30 generally remains constant as the diaphragm 50 moves from the as-blown first configuration A to the second configuration B. This passive movement of the base portion 40 from the first configuration A of FIG. 3A to the second configuration B of FIG. 3B allows the base portion 40 to respond to the internal vacuum immediately after filling, capping, and cooling (typically in a water spray cooling tunnel), thereby reducing risk of damage to the container 10 as it contacts other containers and tooling on the fill line conveyor.

[0046] With reference to FIG. 3C, external force is applied to the base portion 40 to move the base portion 40 from the second configuration B to the activated third configuration C. This can be done at any time after filling and capping, or after the container 10 has cooled. The external force can be applied in any suitable manner. For example, a tool 80A including a curved surface 82 that generally matches curvature of the diaphragm 50 in the activated third configuration C can be used. A tool 80B can also be used, which is sized and shaped to be received within the central push-up portion 42 in order to apply the external force at the central push-up portion 42.

[0047] As the base portion 40 is forced from the second configuration B to the third configuration C, the central push-up portion 42 and the diaphragm 50 are pushed further towards the first end 12. The diaphragm 50 pivots at the hinge portion 56. The curve radius of the diaphragm 50 may be reduced and the diaphragm 50 may temporarily distort or straighten, as illustrated in FIG. 3C, as the radius of the diaphragm 50 reverses from positive to negative. The change in the curve radius of diaphragm 50 may be either uniform or variable about the circumference of the diaphragm. The upstanding wall 52 is forced towards the sidewall 30 to decrease the angle between the upstanding wall 52 and the sidewall 30.

[0048] As additional force is applied to the diaphragm 50, its position is reversed such that, as illustrated in FIG. 3D, the diaphragm 50 is concave relative to external standing surface 54 of the container 10, and more particularly to a plane extending across the standing surface 54. Furthermore, the upstanding wall 52 will pivot back towards the longitudinal axis L and the angle between the upstanding wall 52 and the sidewall 30 will increase back to, or about to, the original angle between the upstanding wall 52 and the sidewall 30 of the first configuration A. Force of the angle of the upstanding wall 52 acts upon the inverted diaphragm 50 to hold the diaphragm 50 in the position of the activated third configuration C and prevent the diaphragm 50 from returning to the second configuration B or the first configuration A. In addition to or in place of the concave and convex configuration of the diaphragm 50 described above, the diaphragm 50 can be provided with a generally straight or S-shaped cross-section.

[0049] By forcing the base portion 40 to the activated third configuration C and into the internal volume 22 of the container 10, any remaining internal vacuum will be eliminated or nearly eliminated. Positive pressure may also be induced into the container 10 to help prevent and fix denting of the container 10. Such a positive pressure state in the container 10 allows for a lighter weight and thinner sidewall 30 that performs as good as, or better than, heavier containers with residual internal vacuum. The base portion 40 is formed using over-stroke, which leads to a base portion 40 with a lighter weight as compared to prior containers, uniform material distribution, and a reduced thickness of the sidewall 30. A clearance is provided between the standing surface 54 and the rest of the base portion 40 to prevent roll-out past the standing surface 54.

[0050] FIGS. 4A and 4B illustrate another container according to the present teachings at reference numeral 110 in the as-blown first configuration A. The container 110 is substantially the same as the container 10. Therefore, features in common between the container 110 and the container 10 are illustrated using the same reference numbers, but increased by 100. The description the container 10 also applies to the container 110, at least with respect to the common features. Unlike the container 10, the container 110 includes dimples 112 formed in the diaphragm 150, such as to provide the diaphragm 150 with additional strength. Although the dimples 112 are illustrated as round recesses within the diaphragm 150, the dimples 160 can have any other suitable size, configuration, and shape.

[0051] FIGS. 5A and 5B illustrate an additional container according to the present teachings at reference numeral 210 in the as-blown first configuration A. The container 210 is substantially the same as the container 10. Therefore, features in common between the container 210 and the container 10 are illustrated using the same reference numbers, but increased by 200. The description the container 10 also applies to the container 210, at least with respect to the common features. Unlike the container 10, the container 210 includes a diaphragm 250 that is at least substantially straight or linear between the hinge 256 and the central push-up portion 242. Thus, from the central push-up portion 242 the diaphragm 250 extends linearly upward to the hinge 256 and generally away from the standing surface 254.

[0052] FIGS. 6A and 6B illustrate an additional container according to the present teachings at reference numeral 310 in the as-blown first configuration A. The container 310 is substantially the same as the container 10. Therefore, features in common between the container 310 and the container 10 are illustrated using the same reference numbers, but increased by 300. The description the container 10 also applies to the container 310, at least with respect to the common features. Unlike the container 10, the container 310 includes a diaphragm 350 that is at least substantially straight or linear between the hinge 356 and the central push-up portion 342. Thus, from the central push-up portion 342 the diaphragm 350 extends linearly upward to the hinge 356 and generally away from the standing surface 354. The container 310 is therefore substantially similar to the container 210, but includes dimples 360 formed in diaphragm 350, such as to provide the diaphragm 350 with additional strength. Although the dimples 360 are illustrated as round recesses within the diaphragm 350, the dimples 360 can have any other suitable size, configuration, and shape.

[0053] FIGS. 7A and 7B illustrate an additional container according to the present teachings at reference numeral 410 in the as-blown first configuration A. The container 410 is substantially the same as the container 10. Therefore, features in common between the container 410 and the container 10 are illustrated using the same reference numbers, but increased by 400. The description the container 10 also applies to the container 410, at least with respect to the common features. Unlike the container 10, the container 410 includes a central push-up portion 442 with a radius that is enlarged as compared to the radius of the central push-up portion 42. Furthermore, the container 410 includes a diaphragm 450 that is at least substantially straight or linear between the hinge 456 and the central push-up portion 442. Thus, from the central push-up portion 442 the diaphragm 450 extends linearly upward to the hinge 456 and generally away from the standing surface 454. FIGS. 8A and 8B illustrate container 510 in the as-blown first configuration A, which is substantially the same as the container 410, but includes dimples 560 formed in diaphragm 550, such as to provide the diaphragm 550 with additional strength. Although the dimples 560 are illustrated as round recesses within the diaphragm 550, the dimples 560 can have any other suitable size, configuration, and shape.

[0054] With reference to FIGS. 9A-9B, another container according to the present teachings is illustrated at reference numeral 610 in the as-blown first configuration A. The container 610 is substantially similar to the container 10. Therefore, features in common between the container 610 and the 10 are illustrated using the same reference numbers, but increased by 600. The description of the container 10 also applies to the container 610, at least with respect to the common features. Unlike the container 10, the container 610 includes a diaphragm or inversion ring/radius 650 that is concave relative to the standing surface 654 and an exterior of the base portion 40 when the base portion 40 is in the as-blown position A of FIGS. 9B, 9C, and 10A (in phantom), for example. The diaphragm or inversion ring/radius 650 is thus without any flat portions or convex portions, which advantageously provides the base portion 640 with a greater ability to absorb internal vacuum prior to the base portion 640 being mechanically inverted to position C of FIG. 10B by any suitable inversion tool, such as tools 80A or 80B of FIG. 3C. Furthermore, unlike the container 10, the primary hemisphere wall 652 of the container 610 has a radius, and is not a linear upstanding wall.

[0055] The base portion 640 further includes an isolation rib 670. The isolation rib 670 is located at the isolation radius 658 and circumscribes the central push-up portion 42. The isolation rib 670 protrudes outward and allows the geometry of the base portion 640 to flex and absorb internal vacuum prior to the base portion 640 being mechanically inverted to the activated position C of FIG. 10B. As illustrated in FIG. 10B, the as-blown concave diaphragm or inversion ring/radius 650 at position A transitions to being at least partially convex in activated position C between the transitional radius hinge 656 and the isolation rib 670. This convex configuration in the activated position C helps to prevent the base portion 640 from reverting to position B or position A.

[0056] The base portion 640 includes an inversion height h (FIG. 9C) between the standing surface 654 and a peak of the inversion radius/ring 650 (such as at the transitional radius hinge 656). The inversion height h controls the amount of vacuum absorbed by the base portion 640. The inversion height h of the base portion 640 is relatively lower than inversion heights of other containers, such as the containers 10, 110, 210, 310, 410, and 510. The relatively short inversion height h of the base portion 640 allows the base portion 640 to absorb more vacuum when moving from position A to position B, and prior to the base portion 640 being mechanically inverted to position C of FIG. 10B by any suitable inversion tool, such as tools 80A or 80B.

[0057] The inversion height h can be any suitable height, and can depend on the diameter DD (see FIGS. 9C and 10A for example) of the diaphragm 650 and the overall size of the container 610. For example, if the container 610 is a 20 oz container and the diameter DD of the diaphragm 650 is 64 mm, the height h can be 9 mm, and thus the ratio of the diaphragm diameter DD to the height h can be 7.11 mm. If the container 610 is a 20 oz container and the diameter DD of the diaphragm 650 is 67.22 mm, the height h can range from 8 mm to 11.79 mm, and thus the ratio of the diaphragm diameter DD to the height h can be from 5.7 mm to 8.4 mm. If the container 610 is a 20 oz container and the diameter DD of the diaphragm 650 is 66.67 mm, the height h can be 14.42 mm and the ratio of the diaphragm diameter DD to the height h can be 4.623 mm. If the container 610 is a 28 oz or 32 oz container and the diameter DD of the diaphragm 650 is 80.5 mm, the height h can be 12.39 mm or 13.62 mm, resulting in a ratio of the diaphragm diameter DD to the height h being 6.49 mm and 5.91 mm respectively. If the container 610 is a 12 oz container and the diameter DD of the diaphragm 650 is 52.68 mm, the ratio of the diaphragm diameter DD to the height h can be 6.175 mm. As the diaphragm diameter (DD)/height (h) ratio is increased, the vacuum absorption capability of the base 640 is advantageously increased. An exemplary diaphragm diameter (DD)/height (h) ratio is greater than about 6 mm. FIG. 11 illustrates exemplary diaphragm diameter (DD)/height (h) ratios for various containers according to the present teachings.

[0058] The vacuum absorption of the base 640 (or any other suitable base) is the ease in which the diaphragm 650 is able to move to absorb initial vacuum as the diaphragm 650 moves from the first configuration A to the second configuration B, and thus prior to being subject to mechanical activation to move the diaphragm to the third configuration C. As the height h increases, the radius of the transitional radius hinge 656 typically decreases. The smaller the radius at 656, the more force (vacuum) that is required to move the base 640 from the first configuration A to the second configuration B, as compared to if the radius at 656 is larger. Therefore, as the height h increases, the base 640 will absorb less vacuum initially. As the h decreases the radius at 656 increases and the base 640 will move at lower vacuum forces absorbing more vacuum initially. In the second configuration B, when the base 640 is mechanically activated, the smaller height h will have a smaller vacuum absorbing capacity overall. For example, at a height h of 11.79 mm, the base 640 can absorb approximately 20.5 ml of volume. At a height h of 9.6 mm, the base 640 can absorb approximately 15.7 ml of volume. The larger the volume that the base 640 ultimately displaces, the lower the final residual vacuum in the container 610. But the initial force required to move the base 640 with the height h of 9.6 mm to relieve the vacuum prior to mechanical activation (mechanically moving the base 640 to configuration C) will be substantially less than the base 640 with the height h of 11.79 mm. Wall thickness of the container base 640 may change based on container size. As wall thickness decreases, the capacity to absorb vacuum increases.

[0059] The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.