Patent Application
20190337691
The present invention relates generally to a closure having a plug seal configuration that allows the closure to interchangeably be fluidly sealed to container neck finishes while providing pressure-relieving plugs. A common problem is containers being required to contain contents that are under more pressure than the container is designed to safely hold. One solution is to provide a single vent or plug at the interface between the container and a closure for the container. This disclosure describes a closure with multiple plugs between the closure and container.
In one embodiment a closure is centered about a vertical axis. The closure comprises a generally circular top panel having an upper surface, a lower surface and an outer periphery. A skirt extends generally perpendicularly downward from the outer periphery of the top panel. A thread is formed about an inner surface of the skirt.
Three generally annular plugs are attached to and extend downwards from the lower surface of the top panel. The first plug is located radially inwards relative to the outer periphery of the top panel, the second plug is located radially between the first plug and the outer periphery of the top panel, and the third plug is located radially between the second plug and the outer periphery.
In one embodiment, when the closure is coupled to the container inlet each of the three plugs interfaces against a surface of a container inlet. The first plug interfaces against an inner surface near the top of the container inlet, the second plug interfaces against an upper surface of the container inlet, and the third plug interfaces against an outer surface near the tope of the container inlet.
The first plug has an inner surface and an outer surface and extends downwardly from a lower surface of the top panel. The third plug is located radially inwards from and concentric with the outer periphery of the top panel. The outer surface of the first plug is defined by a first portion attached to the lower surface of the top panel and by a second portion attached to and extending downwards from a lowermost portion of the first portion. The first portion extends along a first plane at a first angle relative to the vertical axis and the second portion extends along a second plane at a second angle relative to the vertical axis. The second angle is different than the first angle.
The top panel includes an interior portion that is located radially inwards relative to the third plug. The interior portion of the top panel has a thickness that is less than the thickness of the remaining exterior portion of the top panel. As a result, the interior portion of the top panel requires less pressure to deform than the exterior portion of the top panel. The closure engagement with the container and the closure itself is configured to bear, and in some situations to relieve, pressure exerted by the container's contents. When the container's contents exert a sufficiently high pressure, the interior portion of the top panel deforms upward and away from the container's contents.
In the process of the interior portion of the top panel being deformed, the first plug is correspondingly biased inward towards the central axis of the top panel. As a result, the first plug and the inner surface of the container inlet have a looser seal between each other. As the container's contents exert additional pressure, the interior of the top panel deforms further, and the first plug biases further away from the container inlet, until the container's contents (e.g., the gas at the top of the container) are able to force through the interface between the first plug and the closure.
When sufficient gas has forced its way past the first plug, the pressure in the area between the first and second plugs keeps increasing until gas forces its way through the interface between the second plug and the container. Similarly, when sufficient gas has forced its way past the second plug, the pressure in the area between the second and third plugs keeps increasing until gas forces its way through the interface between the third plug and the container. Gas that has transited past the third plug has escaped the container and closure into the atmosphere.
This application will become more fully understood from the following detailed description, taken in conjunction with the accompanying figures, wherein like reference numerals refer to like elements in which:
Before turning to the figures, which illustrate the exemplary embodiments in detail, it should be understood that the present application is not limited to the details or methodology set forth in the description or illustrated in the figures. It should also be understood that the terminology is for the purpose of description only and should not be regarded as limiting.
Turning to
Skirt 14 is generally annular in cross-section and is substantially perpendicular to the plane defined by top panel 12. As shown in
Located along the inner surface of the skirt 14 is a container engagement structure configured to interact with a corresponding closure engagement structure located on the neck of the container to which the closure 10 is to be sealing applied. As shown in
In some embodiments, closure 10 may further include a tamper evidencing structure configured to provide indication to a user that the initial sealing engagement between the closure 10 and container has been disrupted as a result of the closure 10 being partially or entirely removed from the container. As shown in
As shown in
A sealing ring, or plug 40, extends generally downward from the lower surface of top panel 12. In various embodiments, plug 40 is formed as an annular, uninterrupted, continuous ring or wall extending 360 degrees about the lower surface of the top panel 12. In other embodiments, the plug 40 is defined by a generally circumferentially extending structure formed of two or more wall segments. In such embodiments, each wall segment may be spaced apart from an adjacent wall segment by a portion of the lower surface of the top panel 12 to which no wall segments are attached.
A second ring, or second plug 70, extends generally downward from the lower surface of top panel 12. Plug 70 is located radially inwards relative to the outer periphery of top panel 12, and radially outwards relative to plug 40. In various embodiments, plug 70 is formed as an annular, uninterrupted, continuous ring or wall extending 360 degrees about the lower surface of the top panel 12. In other embodiments, plug 70 is defined by a generally circumferentially extending structure formed of two or more wall segments. In such embodiments, each wall segment may be spaced apart from an adjacent wall segment by a portion of the lower surface of the top panel 12 to which no wall segments are attached.
A third ring, or third plug 80, extends generally downward from the lower surface of top panel 12. Plug 80 is located radially inwards relative to the outer periphery of top panel 12, and radially outwards relative to plug 40 and second plug 70. In various embodiments, plug 80 is formed as an annular, uninterrupted, continuous ring or wall extending 360 degrees about the lower surface of the top panel 12. In other embodiments, plug 80 is defined by a generally circumferentially extending structure formed of two or more wall segments. In such embodiments, each wall segment may be spaced apart from an adjacent wall segment by a portion of the lower surface of the top panel 12 to which no wall segments are attached.
As shown in
In some embodiments, the thickness T1 of central portion 12a of the top panel 12 may be between approximately 0.012 inches and approximately 0.032 inches, more specifically between approximately 0.019 inches and approximately 0.025 inches, and even more specifically approximately 0.022 inches.
In some embodiments, the thickness T2 of the outer portion 12b of the top panel 12 may be between approximately 0.025 inches and approximately 0.045 inches, more specifically between approximately 0.032 inches and approximately 0.038 inches, and even more specifically approximately 0.035 inches.
In some embodiments, the thickness T3 of the wall of the skirt 14 may be between approximately 0.022 inches and approximately 0.042 inches, more specifically between approximately 0.029 inches and approximately 0.035 inches, and even more specifically approximately 0.032 inches.
As will be understood with reference to
Turning to
As shown in
As illustrated in
Referring again to
A transition portion 41c connects the lowermost portion of the middle portion 41b to the uppermost portion of the lower portion 41d of the outer surface 41 of plug 40. As shown in
As further shown in
The inner surface 43 of the plug 40 extends downwards from the lower surface of the top panel 12 and is defined by an upper portion 43a and a lower portion 43b. As illustrated in
Turning again to
In some embodiments, the height H1 of the upper portion 43a of the inner surface 43 of the plug 40 is between approximately 0.080 inches and approximately 0.140 inches, more specifically between approximately 0.100 inches and approximately 0.120 inches, and even more specifically approximately 0.110 inches.
In some embodiments, the height H2 of the lower portion 43b of the inner surface 43 of the plug 40 is between approximately 0.010 inches and approximately 0.090 inches, more specifically between approximately 0.035 inches and approximately 0.065 inches, and even more specifically approximately 0.050 inches.
In some embodiments, the height H3 of the outer surface 41 of the plug 41 is between approximately 0.100 inches and approximately 0.200 inches, more specifically between approximately 0.125 inches and approximately 0.175 inches, and even more specifically approximately 0.147 inches.
In some embodiments, a distance D1 as measured between the uppermost portion of the upper portion 41a of the outer surface 41 of the plug 40 and the portion of the inner surface of the wall of the skirt 14 lying opposite the uppermost portion of the upper portion 41a of the outer surface 41 of the plug 40 is between approximately 0.190 inches and approximately 0.390 inches, more specifically between approximately 0.240 inches and approximately 0.340 inches, and even more specifically approximately 0.290 inches.
In some embodiments, a distance D2 as measured between the radially outermost portion of the transition portion 41c of the outer surface 41 of the plug 40 and the portion of the inner surface of the wall of the skirt 14 lying opposite the radially outermost portion of the transition portion 41c is between approximately 0.170 inches and approximately 0.370 inches, more specifically between approximately 0.220 inches and approximately 0.320 inches, and even more specifically approximately 0.270 inches.
As can be seen in
As shown in
Referring now to
Internal chamber 110 refers to the interior volume of the container and closure 10, as fluidly sealed by the interface between outer surface 41 and the inner surface of the container inlet. First chamber 112 refers to a first volume enclosed by closure 10 and the top of the container inlet. First chamber 112 is fluidly sealed by first fluid seal 48 and second fluid seal 78. Second chamber 114 refers to another volume enclosed by closure 10 and the top of the container inlet. Second chamber 114 is fluidly sealed by second fluid seal 78 and third fluid seal 88.
Upper threading chamber 116 is in fluidly communication with lower threading chamber 118, such as via thread gaps 52 (best shown in
In some situations the contents of the container may exert increased pressure on the container and closure 10. As will be understand, pressure from the contents of the container in chamber 110 will be exerted laterally against the surfaces constraining the pressure. Thus, content pressure will be exerted upwards against central portion 12a of top panel 12. When the amount of pressure exerted against central portion 12a reaches a threshold amount, central portion 12a biases upwards. As a result of central portion 12a biasing upwards, plug 40 biases radially inwards towards the center axis of closure 10.
As will be understood, plug 40 biasing radially inwards may comprise plug 40 physically moving radially inwards towards the center axis 13 of closure 10. Alternatively, plug 40 biasing radially inwards may not involve any physical movement of plug 40 and/or de minimis movement of plug 40, and instead involves a decrease in the compressive force between outer surface 41 and container inlet's inner surface. As a result of that force being reduced, fluid seal 48 becomes correspondingly weaker.
When the pressure of container's contents further sufficiently increases to a second threshold, fluid seal 48 is too weak to prevent contents (e.g., fluid, gasses) escaping from internal chamber 110 to first chamber 112.
As a result of the escaping contents, the internal pressure in chamber 110 is reduced, thus strengthening fluid seal 48 for at least two reasons. First, a lower pressure for contents in chamber 116 means that there is a lower pressure from contents to escape past fluid seal 48. Second, lower pressure in chamber 110 means that central portion 12a of top panel 12 is less deformed, meaning that plug 40 is less biased towards central axis 13.
As contents escape past fluid seal 48 to chamber 112, the pressure in chamber 112 correspondingly increases. When the pressure of chamber 112 sufficiently increases to a third threshold, second fluid seal 78 is too weak to prevent contents (e.g., fluid, gasses) escaping from first chamber 112 to second chamber 114.
As contents escape past fluid seal 78 to chamber 114, the pressure in chamber 114 correspondingly increases. When the pressure of chamber 114 sufficiently increases to a fourth threshold, third fluid seal 88 is too weak to prevent contents (e.g., fluid, gasses) escaping from second chamber 114 to upper threading chamber 116. As observed above, both upper threading chamber 116 and lower threading chamber 118 are in fluid communication with an exterior of the container, such as the atmosphere outside the container.
By these three fluid seals 48, 78 and 88, closure 10 provides a mechanism of multiple fluid seals, arranged in series, to provide a safe method for pressure in the container to be relieved. Therefore, chances of a container experiencing a structural catastrophe (e.g., explosion) are correspondingly reduced.
Although at least one of the embodiments described includes three fluid seals between the internal chamber of the container and the exterior of the container, it will be understood that other configurations of seals may be utilized and still practice the spirit and scope of this disclosure. For example, in various embodiments closure 10 comprises, for example, for first fluid seal 48 and second fluid seal 78 but not third fluid seal 88, first fluid seal 48 and third fluid seal 88 but not second fluid seal 78, second fluid seal 78 and third fluid seal 88 but not first fluid seal 48, only first fluid seal 48, only second fluid seal 78, and only third fluid seal 88.
In various embodiments, the closures 10 discussed herein may be of various sizes intended to seal containers of various sizes and having various contents. In some exemplary embodiments, the closures 10 are configured to seal containers such as metal, glass or plastic containers or bottles for holding liquids, granular materials, food, etc. In various embodiments, the plug 40 of the closures 10 discussed herein are suitable for maintaining a hermetic seal with the container neck finish to which the closure 10 is attached.
Turning to
As J-band 200 extends from tamper band 24, the width of J-band is wider at the top 202 of J-band 200 than it is at the bottom 210 of J-band 200. In one embodiment, the width of J-band steadily and linearly increases along the length of J-band 200. Thus, the difference between the width 204 at the top 202 of J-band 200 and the width 208 at the middle 206 of J-band 200, is the same as the difference between the width 208 at the middle 206 of J-band 200 and the width 208 at the bottom 210 of J-band 200 (best shown in
In various other embodiments, J-band 200 maintains a constant width between bottom 210 and middle 206, and instead from middle 206 to top 202 the width of J-band steadily and linearly increases (best shown in
Pleats 230 are arranged periodically around J-band 200. Pleats 230 include protrusions 232 extending upwards and radially outwards from interior surface 214 of J-band 200. Pleats 230 partially define cavity 234 on the exterior surface 216 of pleat 230. In one embodiment, the width at various points of pleats 230 corresponds to the widths of various points of J-band 200 at similar distances from tamper band 24. Thus, the width of pleat 230 at the furthest point from tamper band 24 is similarly wide as the width of J-band at top 202. Further, the width of pleat 230 at middle of pleat 234 is similarly wide to the width of middle 206 of J-band 200.
J-band 200 further includes drain holes 240, which are arranged periodically around the circumference of J-band 200. Drain holes 240 have width 242, which may be increased by virtue of the varying width of J-band 200 relative to drain holes in closures having J-bands with constant widths.
In various embodiments, closure 10 is configured to seal a container configured to hold consumable or edible products (e.g., beverages, water, food, etc.). In various embodiments, closure 10 is configured to seal a container that is a molded (e.g., blow-molded) thermoplastic beverage container configured to hermetically hold a beverage (e.g., water, juice, fortified or nutrient water, tea, sports drink, energy drink, milk, milk-based beverages, etc.). In other embodiments, closure 10 can be used to seal a wide variety of containers including pouches, jars, metal bottles, paper board cartons, etc.
In various embodiments, the closures 10 discussed herein may be formed from a plastic or polymer material. In various embodiments, the closures 10 may be formed by injection molding or by compression molding. For example, the closures 10 may be injection molded from a polypropylene homopolymer resin. In specific embodiments, the closures 10 may be made from a clear (e.g., translucent or transparent) polypropylene homopolymer resin, or they may be made from a clear random copolymer polypropylene. In various embodiments, the clear material of the closure 10 is such that the engagement structure (e.g., threading 20) is visible from the outside of the closure 10 through skirt 14.
In various exemplary embodiments, the relative dimensions, including angles, lengths and radii, as shown in the Figures are to scale. Actual measurements of the Figures will disclose relative dimensions, angles and proportions of the various exemplary embodiments. Various exemplary embodiments extend to various ranges around the absolute and relative dimensions, angles and proportions that may be determined from the Figures. Various exemplary embodiments include any combination of one or more relative dimensions or angles that may be determined from the Figures. Further, actual dimensions not expressly set out in this description can be determined by using the ratios of dimensions measured in the Figures in combination with the express dimensions set out in this description. It should also be understood that the terminology is for the purpose of description only and should not be regarded as limiting.
It should be understood that the figures illustrate the exemplary embodiments in detail, and it should be understood that the present application is not limited to the details or methodology set forth in the description or illustrated in the figures. It should also be understood that the terminology is for the purpose of description only and should not be regarded as limiting.
Further modifications and alternative embodiments of various aspects of the invention will be apparent to those skilled in the art in view of this description. Accordingly, this description is to be construed as illustrative only. The construction and arrangements, shown in the various exemplary embodiments, are illustrative only. Although only a few embodiments have been described in detail in this disclosure, many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. Some elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. The order or sequence of any process, logical algorithm, or method steps may be varied or re-sequenced according to alternative embodiments. Other substitutions, modifications, changes and omissions may also be made in the design, operating conditions and arrangement of the various exemplary embodiments without departing from the scope of the present invention.
