Tamper-evident closure
A tamper-evident closure system is provided for a container. The system has a body for extending from the container at the container opening. The body defines a dispensing orifice and an attachment surface. The system includes a lid for being moved between a closed position and an open position. An anchor member is provided for being attached to the body attachment surface when the lid is first closed on the body. At least one frangible web initially connects the anchor member with the lid so that the frangible web breaks when the lid is initially lifted from the closed position.
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Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENTNot applicable.
REFERENCE TO A MICROFICHE APPENDIXNot applicable.
TECHNICAL FIELDThis invention relates to a tamper-evident closure system for a container. The invention is particularly suitable for incorporation in a dispensing closure for use with a squeezable container.
BACKGROUND OF THE INVENTION AND TECHNICAL PROBLEMS POSED BY THE PRIOR ARTThere are a variety of types of conventional closures which function generally satisfactorily in applications for which they are designed. One type of prior art closure includes a body or base for being attached to the top of a container. The body defines a dispensing orifice. The system further includes a lid which is mounted on the base or body and which can be lifted up to open the dispensing orifice. See, for example, U.S. Pat. No. 6,644,487.
The U.S. Pat. No. 6,644,487 discloses a design which also includes tamper-evident frangible webs for connecting the lid to the body and for initially preventing the lid from being lifted away from the body unless and until a sufficient lifting force is applied to the lid to break the webs, and such breakage serves as a tamper-evident feature. While such a design offers significant advantages, it would be desirable to provide a further improved tamper-evident closure system.
In particular, it would be desirable to provide an improved design in which the tamper-evident feature can be optionally more strongly integrated into the closure system and/or can be optionally made even more noticeable to the user (before the tamper-evident feature is broken prior to the lid being initially opened, as well as after the tamper-evident feature has been broken and the lid is re-closed).
It would also be advantageous if such an improved tamper-evident closure system could also be adapted for use with a one-piece, unitary closure system as well as with a two-piece, or other multiple-piece, closure system.
It would also be beneficial if such an improved tamper-evident closure system could optionally readily accommodate the connection of the lid to the body with a hinge structure, either a hinge structure that is unitary with both the lid and body, or a two-piece hinge structure that is part of a separately formed lid and separately formed body which can be assembled together.
It would also be advantageous if such an improved tamper-evident closure system could optionally incorporate the tamper-evident feature in a way which does not hinder access to, or obstruct, the front of the lid where a thumb lift tab might be employed.
It would also be desirable to provide a tamper-evident closure system which would not require the use of a freshness seal or liner across the closure or container opening, and that would have a minimum number of components so as to facilitate manufacture and assembly.
It would also be advantageous to provide a closure system with the capability for accommodating optional tamper-evident features between the container and closure system body that can readily indicate to a consumer that the closure system has been initially removed from the container.
It would also be beneficial if a closure system could readily accommodate its manufacture from at least a thermoplastic material, or other material.
It would also be advantageous if such an improved closure system could accommodate bottles, containers, or packages which have a variety of shapes and which are constructed from a variety of materials.
Further, it would be desirable if such an improved system could accommodate efficient, high-quality, high-speed, large volume manufacturing techniques with a reduced product reject rate to produce products having consistent operating characteristics unit-to-unit with high reliability.
BRIEF SUMMARY OF THE INVENTIONThe present invention can be incorporated into a closure system that may include one or more of the above-discussed, desired features.
The present invention provides an improved tamper-evident closure system for a container that has an opening to the container interior. The system can be readily operated by the user to initially open the system.
If desired, the improved system can accommodate a tamper-evident feature that is optionally more strongly integrated into the closure and/or is optionally more readily visible so that the condition or status of the feature (i.e., unbroken or broken) can be easily observed.
The initial opening operation of the inventive, tamper-evident closure system lid does not produce a separate, loose piece which must be discarded. The tamper-evident closure system can be employed with a one-piece or multi-piece closure body and lid design. Further, the tamper-evident closure system readily accommodates the employment of a thumb lift tab on the lid and also readily accommodates a unitary, or multi-piece, hinge structure between the lid and the body. The system also accommodates the use of other, optional, tamper-evident features between the closure body and the container.
According to a first aspect of a presently preferred embodiment of the invention, the tamper-evident feature is more strongly integrated into the closure system by welding. The system includes a body that is either a separate structure for attaching to, and extending from, the container at the container opening or is a unitary extension of the container at the opening.
The body has
-
- (1) at least one orifice for communicating with the container opening, and
- (2) a thermoplastic attachment surface.
A lid is adapted to be disposed on the body for accommodating lifting of the lid relative to the at least one orifice between (1) a closed position over the at least one orifice, and (2) an open position away from the at least one orifice.
An anchor member is provided with a thermoplastic attaching portion for being welded to the body attachment surface when the lid is first in the closed position. In the preferred embodiment, ultrasonic welding is employed.
At least one frangible web extends between the lid and the anchor member for initially connecting the anchor member with the lid, and the web is subsequently broken when the lid is first lifted from the closed position.
According to a second aspect of the invention, a more visible tamper-evident feature in a closure system is provided for a container that has an opening to the container interior. This second aspect of the invention may be provided in the closure system without the above-described first aspect of the invention, or vice versa. The closure system includes a body that is either a separate structure for attaching to, and extending from, the container at the opening or is a unitary extension of the container at the opening. The body has at least one orifice for communicating with the container opening.
A lid is adapted to be disposed in the body for accommodating lifting of the lid relative to the at least one orifice between (1) a closed position over the at least one orifice, and (2) an open position away from the at least one orifice. The lid has a lower edge.
An anchor member is non-removably fixed to the body when the lid is first in the closed position to define a vertical gap between the anchor member and the lid lower edge.
At least one frangible web extends across the gap between the lid lower edge and the anchor member for initially connecting the anchor member with the lid for subsequently being broken when the lid is first lifted from the closed position. The frangible web is highly visible in the gap.
In a most preferred form of the invention, both the above-described first aspect of the invention and the above-described second aspect of the invention are included together in the closure system.
According to yet another aspect of the invention, a method is provided for making a tamper-evident closure system for a container that has an opening to the container interior. The method comprises the steps of:
(A) molding from thermoplastic material a body that
-
- (1) is either a separate structure for attaching to, and extending from, the container at the opening or is a unitary extension of the container at the opening,
- (2) has at least one orifice for communicating with the container opening, and
- (3) has a thermoplastic attachment surface;
(B) molding from thermoplastic material a top structure comprising (1) a lid, (2) an anchor member that has an attaching portion, and (3) at least one frangible web that extends between, and is unitary with, the lid and the anchor member wherein the lid is adapted to be disposed on the body for accommodating lifting of the lid relative to the at least one orifice between (i) a closed position over the at least one orifice, and (ii) an open position away from the at least one orifice;
(C) mounting the top structure on the body with the lid disposed on the body in the closed position and with the anchor member attaching portion located adjacent the body attachment surface; and
(D) welding the anchor member attaching portion to the body attachment surface when the lid is first in the closed position to initially connect the anchor member with the lid so that the at least one frangible web can be subsequently broken when the lid is first lifted from the closed position.
Numerous other advantages and features of the present invention will become readily apparent from the following detailed description of the invention, from the claims, and from the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGSIn the accompanying drawings that form part of the specification, and in which like numerals are employed to designate like parts throughout the same,
While this invention is susceptible of embodiment in many different forms, this specification and the accompanying drawings disclose only some specific forms as examples of the invention. The invention is not intended to be limited to the embodiments so described, however. The scope of the invention is pointed out in the appended claims.
For ease of description, most of the figures illustrating the invention show a closure system in the typical orientation that it would have at the top of a container when the container is stored upright on its base, and terms such as upper, lower, horizontal, etc., are used with reference to this position. It will be understood, however, that the closure system of this invention may be manufactured, stored, transported, used, and sold in an orientation other than the position described.
The closure system of this invention is suitable for use with a variety of conventional or special containers having various designs, the details of which, although not illustrated or described, would be apparent to those having skill in the art and an understanding of such containers. The container, per se, described herein forms no part of, and therefore is not intended to limit, the present invention. It will also be understood by those of ordinary skill that novel and non-obvious inventive aspects are embodied in the described exemplary closure systems alone.
A presently preferred embodiment of a tamper-evident closure system of the present invention is illustrated in
The body 24 of the container 22 may have any suitable configuration, and the upwardly projecting neck 26 may have a different cross-sectional size and/or shape than the container body 24. (Alternatively, the container 22 need not have a neck 26, per se. Instead, the container 22 may consist of just a body with an opening.) The container 22 may have a rigid wall or walls, or may have a somewhat flexible wall or walls.
Although the container, per se, does not necessarily form a part of the broadest aspects of the present invention, per se, it will be appreciated that at least a body portion of the system 20 of the present invention optionally may be provided as a unitary portion, or extension, of the top of the container. However, in the preferred embodiment illustrated, the system 20 is a separate unit (e.g., a closure) which can be either one-piece or multiple pieces, and which is adapted to be removably or non-removably installed on a previously manufactured container 22 that has an opening 28 to the container interior. Hereinafter, the closure system 20 will be more simply referred to as the closure 20.
The closure 20 is adapted to be used with a container 22 having an opening 28 to provide access to the container interior and to a product contained therein. The closure 20 can be used with many materials, including, but not limited to, relatively low or high viscosity liquids, creams, gels, suspensions, mixtures, lotions, pastes, particulates, granular materials, small pieces or items, etc. as constituting a food product, a beverage product, a personal care product, an industrial or household cleaning product, or other compositions of matter (e.g., compositions for use in activities involving manufacturing, commercial or household maintenance, construction, agriculture, etc.).
The container 22 with which the closure 20 may be used would typically be a squeezable container having a flexible wall or walls which can be grasped by the user and squeezed or compressed to increase the internal pressure within the container so as to force the product out of the container and through the opened closure. Such a flexible container wall typically has sufficient, inherent resiliency so that when the squeezing forces are removed, the container wall returns to its normal, unstressed shape. Such a squeezable wall container is preferred in many applications but may not be necessary or preferred in other applications. For example, in some applications it may be desirable to employ a generally rigid container, and to pressurize the container interior at selected times with a piston or other pressurizing system. Also, the interior of the container need not be pressurized at all. Instead, if the closure is large enough, the product could be accessed by reaching through the open closure with a hand, spoon or straw, or the package could be inverted to let the product discharge through the opened closure solely under the influence of gravity.
It is presently contemplated that many applications employing the closure 20 will conveniently be realized by molding some or all of the components of the closure 20 from suitable thermoplastic material or materials. In the preferred embodiment illustrated, the components of the closure could each be molded from a suitable thermoplastic material, such as, but not limited to, polypropylene. The closure components may be separately molded from the same material or from different materials. The materials may have the same or different colors and textures.
As can be seen in
The lid 40 is movable between a closed position over the body as shown in
As can be seen in
As shown in
As can be seen in
As can be seen in
Alternatively, the closure skirt 90 could be provided with some other container connecting means, such as a snap-fit bead or groove (not illustrated) in place of the thread 92 for engaging a container neck groove or bead (not illustrated), respectively. The closure body 30 could also be permanently attached to the container 22 by means of induction melting, ultrasonic melting, gluing, or the like, depending on materials used for the closure body 30 and container 22. The closure body 30 could also be formed as a unitary part, or extension, of the container 22.
The closure body skirt 90 may have any suitable configuration for accommodating an upwardly projecting neck 26 or other portion of the container 22 received within the particular configuration of the closure body 30, and the main part of the container 22 may have a different cross-sectional shape than the container neck 26 and closure body 30.
An optional seal or liner (not illustrated) may be sealed across the top of the container neck 26 or, alternatively, may be sealed across an interior region or underside of the upper portion of the closure body 30. However, if the function of a tamper-evident seal or freshness seal as provided by such a liner is not needed or desired in a particular application, then the liner may, of course, be omitted.
Also, if desired, the closure body 30 may be provided with an interior, annular seal 96 (
In the preferred form of the invention illustrated, the closure body skirt 90 has a generally annular configuration. However, the closure body skirt 90 may have other configurations. For example, the closure body skirt 90 might have a prism or polygon configuration adapted to be mounted to the top of a container neck having a polygon configuration. Such prism or polygon configurations would not accommodate the use of a threaded attachment, but other means of attachment could be provided, such as a snap-fit bead and groove arrangement, or the like. However, if the closure body included a double wall defining a polygon outer skirt and a cylindrical inner attachment wall, then the cylindrical inner attachment wall could be provided with a thread for engagement with a threaded container.
In one preferred form of the invention as shown in
The use of a tamper-evident ring or band 100 is an entirely optional feature of the illustrated embodiment, and it does not form a necessary part of the present invention. Indeed, if the closure body 30 is non-releasably attached to the container neck 26 (as with adhesive, thermal bonding, irreversible snap-fit configurations, etc.), then the tamper-evident ring 100 would provide no additional benefit. Similarly, a tamper-evident ring 100 would provide no additional benefit if the closure body 30 is formed as a unitary molded extension of the container neck 26.
As shown in
With reference to
As can be seen in
According to the present invention, a unique tamper-evident feature is provided for indicating that the lid 40 has been initially moved away from the fully closed configuration (
In the preferred embodiment, there are two anchor members 152--one provided on each side of the lid 40 along the bottom edge of the lid 40, but spaced a distance Y (
In the illustrated preferred embodiment, each anchor member 152 includes a generally vertically inner surface 153 (FIGS. 12,.13, 15, 16, and 17) that faces radially inwardly and that is connected to the lower portion of each frangible web 160. The webs 160 are initially molded simultaneously with, and as part of the unitary top structure that includes, the lid 40 and anchor members 152. Each anchor member 152 is a generally arcuate bar. In other contemplated embodiments (not illustrated), each anchor member need not be an arcuate bar. Each anchor member 152 includes an attaching portion 162 (
In the presently contemplated preferred form of the invention, the manufacturer can readily mold the lid 40, webs 160, and anchor members 152 (with the protuberances 164) together as a single, unitary component (i.e., the top structure), and the manufacturer can separately mold the closure body 30 as another, separate component. The top structure and body 30 may be molded from the same thermoplastic material or from different thermoplastic materials. The lid 40, webs 160, anchor members 152, and body 30 may have the same color and texture or may have different colors and/or textures.
After separately molding the closure body 30 and the top structure (i.e., the lid 40, webs 160, and anchor members 152 with protuberances 164), the two components are assembled by mounting the lid 40 on the closure body 30 so that the lid hinge shaft 132 is received in a snap-fit engagement within the closure body receiving channel 82. The lid 40 is initially closed on the closure body 30 as shown in
A presently preferred method for welding the anchor members 152 to the closure body lower deck 54 employs thermoplastic welding, and preferably thermoplastic welding as effected with ultrasonic energy. The triangular cross section protuberance 164 on the attachment portion 162 at the bottom of each anchor member 152 functions as an energy director for the ultrasonic energy. The ultrasonic energy can be applied with commercial ultrasonic welding equipment which may be of any suitable conventional or special design. Such ultrasonic welding equipment typically includes a suitable horn or engaging member for engaging the outwardly facing, exterior portions of the anchor members 152 and for applying a force against the anchor members 152 in a direction tending to urge the anchor members 152 downwardly toward the closure body lower deck attachment surface 54 at the same time that the ultrasonic equipment transfers ultrasonic energy into and through the anchor members 152. The equipment operating energy, time, force, etc. depend, of course, on the size and mass of the closure top structure components that are to be welded as well as upon the type of thermoplastic material. The detailed design and operation of such ultrasonic welding equipment forms no part of the present invention.
In one presently preferred embodiment, the ultrasonic welding of the anchor members 152 to the closure body lower deck 54 is facilitated by providing the deck 54 with a textured surface. One such suitable textured surface can be provided by conventional etching of the relevant region of the mold steel through a conventional texture mask or plaque. In a preferred embodiment of the closure molded from polypropylene, the surface of the mold at the attachment surface 54 is AISI (American Iron and Steel Institute) type 420 stainless steel with a hardness of 54-64 Rockwell c that has been (1) ferric chloride acid attached to a depth of 0.052 mm. through a plaque or mask designated MT 11050 as sold by Mold Tech (having an office at 279 East Lies Road, Carol Stream, Ill. 60188, U.S.A.), and (2) bead blasted to remove ash residue.
During the welding of the anchor members 152 to the closure body deck 54, the energy director protuberances 164 (which may have a projection of about 0.55 mm. in a presently preferred embodiment) become softened and/or melted along with adjacent portions of the closure body deck 54. The softened or melted protuberances 164 and the softened or melted portions of the closure body deck 54, along with any softened or melted portions of the anchor member 152 adjacent the protuberances 164) fuse and re-solidify after termination of the application of the ultrasonic energy and force. This effects a welding of the thermoplastic material (as schematically designated by reference number 168 in
In the preferred embodiment, the energy deflector protuberances 164 project downwardly about 0.55 mm. After being ultrasonically welded, the melted and fused protuberances 164 loose substantially all of their original height and shape so that the 0.55 mm. gap initially defined by the protuberances 164 is substantially eliminated and reduced to approximately 0 mm.
The assembled, closed, and welded closure 20 may then be shipped to an entity that fills bottles or other containers with a fluent product and then installs the closures 20 on the filled containers.
With reference to
As best seen in
When the user wishes to open the closure, the user applies a generally upwardly directed force to the closure lid thumb lift 128 (
As shown in
Before the lid 40 is lifted for the first time to break the frangible webs 160, the frangible webs 160 provide an indication that the lid 40 has not yet been opened. The user can readily see that the frangible web 160 are not ruptured because the frangible webs 160 span a relatively large gap having the height Y as shown in
Further, the tamper-evident feature of the closure 20 can be enhanced by molding the lid 40, frangible webs 160, and anchor members 152 from a suitable thermoplastic material that changes color after being subjected to a sufficient level of stress. In a preferred embodiment, polypropylene is used for molding the components, and during subsequent rupture of the frangible webs 160, the frangible webs 160 are subjected to sufficient stress to cause “stress whitening” in the region of the break. Thus, if the polypropylene that is used to mold the lid 40, frangible webs 160, and anchor members 152 is tinted or colored so that it initially has a non-white hue, then there will be a lightening or whitening of the color of the material at, and adjacent, the broken surfaces of the frangible webs. This will further aid the user in ascertaining that the webs 160 have been broken.
According to one aspect of the invention, the use of the relatively long frangible webs 160 to span the gap Y provides an enhanced tamper-evident feature regardless of how each anchor member 152 is affixed or connected to the underlying closure body deck 54. Thus, it is not necessary, according to an optional form of the invention, to secure the anchor members 152 to the closure body deck 54 with a thermoplastic weld. Instead, other connection means could be employed, such as, for example, a mechanical interference fit, staking, gluing, etc. If the anchor members 152 are attached to the closure body deck 54 by means other than welding, then the closure components may be made from materials other than weldable thermoplastic materials.
If desired, the frangible webs 160 could be configured to have orientations other than the generally vertical orientation illustrated in
In yet another contemplated embodiment, the frangible webs 160 could be bi-injection-molded onto the lid 40 and anchor members 152 after the lid 40 and anchor members 152 are initially molded. That would permit the webs 160 to be molded from a different material having a different color and/or texture. This would make the frangible webs 160 even more visible to the user.
The structure of the tamper-evident webs 160, in relation to the closure lid 40 and anchor members 152, accommodates ease of molding of the lid 40, webs 160, and anchor members 152, and such molding does not require side action molding components or lifters. Further, the closure 20 functions well with various types of hinge structures, or with no hinge. Additionally, no separate shrink band is required to provide the tamper-evident function that is performed by the frangible webs 160. Opening the lid 40 of the closure 20 does not require the user to break and remove a separate, discardable piece (e.g., shrink band). The tamper-evident function provided by the frangible webs 160 eliminates the need to provide other types of tamper-evident features that may be more expensive or more difficult to use.
Furthermore, the tamper-evident structure provided by the frangible webs 160 (in conjunction with the anchor members 152 and the securement of the anchor members 152 to the closure body 30) accommodates the design of a closure which has high retention strength and which is very secure—especially when the design employs a weld of the anchor members 152 to the closure body 30.
The closure 20 need not be made in two or more separate parts. For example, if desired, the entire closure 20 could be molded as a single, unitary structure with an integral hinge system such as a snap-action hinge, tether hinge, or the like. The detailed design of such a hinge system forms no part of the present invention. Indeed, the present invention contemplates that the lid 40 and closure body 30 could be provided as separate components without any hinge structure so that the lid would not remain attached to the closure body after the assembly is opened.
When the closure 20 is in the full open condition as shown in
It will also be appreciated that the closure system of the present invention need not be provided as a separate closure for a container. The closure body 30 could instead be molded as a unitary part of the container 22. A container could be molded to have (1) an initially open bottom end, (2) a peripheral wall forming an upper end that defines a container top end opening, and (3) a unitary closure body portion extending radially inwardly from the container peripheral wall over the container top end opening so as to form a unitary part of the container top end and so as to define a unitary, top end closure body, including the spout 42 (and optionally including a hinge and lid, if the body, hinge, and lid are to be part of a single, unitary structure). Then, the container could be filled with product through the open bottom end, and the open bottom end could be subsequently sealed closed by appropriate means, such as with thermally assisted deformation or with a separate bottom closure plug or bottom cap.
It will also be appreciated that the closure system of the present invention may include other components, elements, or features. For example, the closure body 30 (
It will be readily apparent from the foregoing detailed description of the invention and from the illustrations thereof that numerous variations and modifications may be effected without departing from the true spirit and scope of the novel concepts or principles of this invention.
Claims
1. A tamper-evident closure system for a container that has an opening to the container interior, said closure system comprising:
- a body that is either a separate structure for attaching to, and extending from, said container at said opening or is a unitary extension of said container at said opening, said body having (1) at least one orifice for communicating with said container opening, and (2) a thermoplastic attachment surface;
- a lid adapted to be disposed on said body for accommodating lifting of said lid relative to said at least one orifice between (1) a closed position over said at least one orifice, and (2) an open position away from said at least one orifice;
- an anchor member having a thermoplastic attaching portion for being welded to said body attachment surface when said lid is first in said closed position; and
- at least one frangible web extending between said lid and said anchor member for initially connecting said anchor member with said lid for subsequently being broken when said lid is first lifted from said closed position.
2. The closure system in accordance with claim 1 further including a welded connection between said attachment surface of said body and said attaching portion of said anchor member.
3. The closure system in accordance with claim 1 in which there are two anchor members each having an attachment portion that includes an energy director having a triangular cross section for facilitating ultrasonic welding of the anchor member to said body attachment surface.
4. The closure system in accordance with claim 1 in which
- a portion of said lid has a skirt with a generally cylindrical exterior surface; and
- each of said frangible webs has an upper portion molded as a unitary extension from said exterior surface of said lid skirt.
5. The closure system in accordance with claim 1 in which each said frangible web has an upper wide portion and a lower narrow portion.
6. The closure system in accordance with claim 1 in which
- a portion of each said anchor member defines a radially inwardly facing surface;
- each said frangible web has a lower portion molded as a unitary extension from said anchor member inwardly facing surface.
7. The closure system in accordance with claim 1 in which
- said closure system is a closure for an end of said container wherein the container end defines said container opening; and
- said closure includes said body, said lid, said anchor member, and said at least one frangible member.
8. The closure system in accordance with claim 7 in which
- said closure is an article that is separate from said container; and
- said body is attachable to said container end over said container opening.
9. The closure system in accordance with claim 1 in which said lid, said anchor member, and said at least one frangible member are molded together from a thermoplastic material to form a unitary structure that is initially separate from said closure body.
10. A tamper-evident closure system for a container that has an opening to the container interior, said closure system comprising:
- a body that is either a separate structure for attaching to, and extending from, said container at said opening or is a unitary extension of said container at said opening, said body having at least one orifice for communicating with said container opening, and a
- a lid adapted to be disposed on said body for accommodating lifting of said lid relative to said at least one orifice between (1) a closed position over said at least one orifice, and (2) an open position away from said at least one orifice, said lid having a lower edge;
- an anchor member non-removably fixed to said body when said lid is first in said closed position to define a vertical gap between said anchor member and said lid lower edge; and
- at least one frangible web extending across said gap between said lid lower edge and said anchor member for initially connecting said anchor member with said lid for subsequently being broken when said lid is first lifted from said closed position.
11. The closure system in accordance with claim 10 in which
- a portion of said lid has a skirt with a generally cylindrical exterior surface; and
- each said frangible web has an upper portion molded as a unitary extension from said exterior surface of said lid skirt.
12. The closure system in accordance with claim 10 in which
- each said frangible web has an upper wide portion and a lower narrow portion; and
- the height of said vertical gap between said anchor member and said lid lower edge is greater than the width of said frangible web upper wide portion.
13. The closure system in accordance with claim 10 in which
- a portion of each said anchor member defines a radially inwardly facing surface; and
- each said frangible web has a lower portion molded as a unitary extension from said anchor member inwardly facing surface.
14. The closure system in accordance with claim 10 in which
- said closure system is a closure for an end of said container wherein the container end defines said container opening; and
- said closure includes said body, said lid, said anchor member, and said at least one frangible member.
15. The closure system in accordance with claim 14 in which
- said closure is an article that is separate from said container; and
- said body is attachable to said container end over said container opening.
16. The closure system in accordance with claim 10 in which said lid, said anchor member, and said at least one frangible member are molded together from a thermoplastic material to form a unitary structure that is initially separate from said closure body.
17. A method for making a tamper-evident closure system for a container that has an opening to the container interior, said method comprising the steps of:
- (A) molding from thermoplastic material a body that (1) is either a separate structure for attaching to, and extending from, said container at said opening or is a unitary extension of said container at said opening, (2) has at least one orifice for communicating with said container opening, and (3) has a thermoplastic attachment surface;
- (B) molding from thermoplastic material a top structure comprising (1) a lid, (2) an anchor member that has an attaching portion, and (3) at least one frangible web that extends between, and is unitary with, said lid and said anchor member wherein said lid is adapted to be disposed on said body for accommodating lifting of said lid relative to said at least one orifice between (i) a closed position over said at least one orifice, and (ii) an open position away from said at least one orifice;
- (C) mounting said top structure on said body with said lid disposed on said body in said closed position and with said anchor member attaching portion located adjacent said body thermoplastic attachment surface; and
- (D) welding said anchor member attaching portion to said body thermoplastic attachment surface when said lid is first in said closed position to initially connect said anchor member with said lid so that said at least one frangible web can be subsequently broken when said lid is first lifted from said closed position.
18. The method in accordance with claim 17 in which
- step (B) includes molding said top structure to have said anchor member that has an attaching portion that includes an energy director having a triangular cross section for facilitating ultrasonic welding of the anchor member to said body attachment surface; and
- step (D) includes utrasonically welding said anchor member to said body attachment surface.
19. The method in accordance with claim 17 in which
- step (B) includes molding a portion of said lid to have a skirt with a generally cylindrical exterior surface and a lower edge;
- step (B) includes molding said anchor member to have an inwardly facing surface; and
- step (B) includes molding each of said frangible webs to (1) have an upper portion molded as a unitary extension from said exterior surface of said lid skirt, (2) have a narrower lower portion molded as a unitary extension from said anchor member inwardly facing surface, and (3) have a length sufficient to create a vertical gap between said anchor member and said skirt lower edge wherein the height of said gap is greater than the width of said web upper portion.
Type: Application
Filed: Nov 8, 2005
Publication Date: May 10, 2007
Applicant:
Inventors: Travis Hoepner (Mukwonago, WI), James Hammond (North Prairie, WI), Cori Blomdahl (Muskego, WI)
Application Number: 11/268,917
International Classification: B65D 39/00 (20060101); B65D 47/00 (20060101); B65D 51/00 (20060101);