KR20140054054A - Wiper packaging incorporating magnetic seal - Google Patents

Abstract

There is provided a storage package for wet wiper sheets, said storage package comprising:
A body substantially impermeable to liquids and vapors, the body having an interior configured to receive and store a plurality of wet wiper sheets pre-wetted with an evaporative solution, the access opening for insertion and withdrawal of the wet wiper sheets, A body;
At least one first sealing element forming a magnet supported on the first support structure at the inner, outer position; And
At least one second sealing element having a complementary magnetic attraction to the first sealing element, the second sealing element being disposed on the second support structure at an inner,
The second support structure may be selectively movable with respect to the first support structure to open and close the access opening and the first support structure may be moved in a state of being disposed in contact with the second support structure in an opposed relationship The first sealing element and the second sealing element cooperatively form a magnetic seal that reversibly seals the entry opening in a closed state by acting through the first and second support structures.
A method of packaging wet wiper sheets is also provided.

Description

Wiper packaging incorporating magnetic seal < RTI ID = 0.0 >

[Cross reference of related application]

This application claims priority to U.S. Provisional Application No. 61 / 514,582, filed August 3, 2011, the contents of which are incorporated herein by reference in their entirety.

The present invention relates generally to a package construction for a cleaning wiping wiper, and more particularly to a cleaning wiping package having a liquid impermeable containment structure, wherein the package has an opening at a location adjacent the periphery of the opening Resealable openings comprising one or more magnetic strips used to selectively seal, thereby preventing evaporation of the solvent or medicament used to prewet the wetting wipes for cleaning.

A wet wiper for cleaning the fabric constitution is known. Such a wet wiper is prewetted with a solvent or other cleaning agent and then stored in an appropriate package. Such a package may have the form of a flexible bell-shaped container that can be opened to allow access to the contained wet wiper. The wet wiper package may have a relatively shallow tray shape with a detachable surface cover or lid.

In use, as the user draws individual wet wipers, the user can access the interior of the wet wiper package multiple times through the mouth opening. When the container is closed during use, evaporation of the solvent or other cleaning agent may be reduced. For example, U.S. Patent No. 6,978,889 discloses a resealable package of this type of prior art, which is incorporated herein by reference in its entirety. Although such a system may be used in a controlled manner, the adhesive force of the detachable adhesive may decrease after multiple uses. Thus, there is still a need for an improved sealing system for flexible storage containers.

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The present invention provides advantages and alternatives over conventional wet wiper sheet package systems by providing a storage package for wet wipers pre-wetted with a solvent to be vaporized. The storage package, together with the access opening, includes at least a pair of attracted strips configured to selectively seal the access opening and having an opposite polarity to prevent or reduce evaporation of the solvent in the sealed state.

According to one exemplary embodiment, the present invention may be implemented in a computer-readable medium, such as /////////////////

[0002] In accordance with one exemplary practice, the present disclosure provides a storage package for wet wiper sheets including a liquid and vapor impermeable body adapted to receive and store a plurality of wet wiper sheets presaturated with a solution subject to evaporation. Adapted for insertion and extraction of the wet wiper seats. At least a first support element is defined as a first support element. At least a second sealing element is a non - magnetized or non - magnetized character. (A). (B). The second support structure is selectively moveable relative to the first support structure to open and close the access opening such that when the first support structure is disposed in contacting and opposing relation to the second support structure, The second sealing element will act through the first supporting structure and the second supporting structure to form a magnetic seal. A method of package wet wiper sheets is also provided.

Other features and advantages of the present invention will become apparent to those of ordinary skill in the art with reference to the following detailed description, claims, and drawings.

Figure 1 shows a schematic perspective view of a flexible containment envelope construction configured to hold wet wiper sheets, wherein the open state of the envelope is shown;
Fig. 2 is a schematic cross-sectional view taken generally along line 2-2 of Fig. 1, wherein the closed state of the envelope is shown;
FIG. 3 is a schematic plan view of an exemplary blank material that may be used to form an exemplary package, such as the one shown in FIGS. 1 and 2;
Figure 4 is a schematic perspective view of a packaging tray configured to hold wet wiper sheets, wherein the closed state of the packaging container is shown;
5 is a schematic cross-sectional view taken along the line 5-5 of FIG. 4 as a whole.
While the present invention has been illustrated and described in connection with certain exemplary and preferred embodiments and procedures, it should be understood that the invention is not limited to those illustrated and described herein. Rather, it is to be understood that the present application is intended to cover all modifications and alternatives that may be broadly included within the spirit and scope of the invention.

Referring to the drawings, like reference numerals have been given to like elements throughout the various views. Referring to Figs. 1-3, an exemplary package for a plurality of wet wiper sheets 10 that may have a single ply or multiple ply construction is shown. It is contemplated that the wet wiper sheets 10 may be formed of a non-woven absorbent textile material or woven knit that has been previously wetted with a solvent or other cleaning agent . The wet wiper sheets have sufficient flexibility to allow folding.

In the embodiment of Figures 1 and 2, the wet wiper sheets 10 may be placed in a flexible containment envelope 12 of a foil laminate or other material known to those skilled in the art The stored foil laminate or other material forms an envelope body that is substantially impermeable to the transmission of liquid and gas. The containment envelope 12 includes a resealable mouth opening 14 (also referred to as a pouch opening or an access opening) The first peripheral edge 16 and the second peripheral edge 18 have an orientation that is substantially opposite to each other along the length of the snout opening 14. 2, each of the first peripheral edge 16 and the second peripheral edge 18 may be formed by folding a receiving envelope material forming the deformable wall against itself, A double layer cuff construction with a pocket between layers is established outward.

2, in the illustrated exemplary arrangement, the first sealing element 20, which is in the form of a magnetic strip, can be disposed in a substantially covered and contained relationship in a pocket below the first peripheral edge 16. [ The second sealing element 22 in the form of a magnetic strip or of a cutting material that can be attracted by the magnetism with respect to the first sealing element 20 is substantially covered in the pocket below the second peripheral edge 18, And the like. Thus, the sealing elements 20, 22 cooperate to form a working magnetic seal, which preferably extends substantially continuously along the entire length of the muzzle opening 14. [ Although the complementary sealing elements 20, 22 are shown to extend substantially to the corresponding heights inside the peripheral edges 16, 18, in practice the magnetic strips are desired in the pocket below the peripheral edges Lt; RTI ID = 0.0 > heights < / RTI >

As shown, the pockets containing the first sealing element 20 and the second sealing element 22 can be closed if necessary. As an example, the folded portion of the envelope material may be adhesively bonded or heat bonded to a portion of the envelope body at a height below the sealing elements 20, 22 to form a surface seal portion 24 . If desired, such surface seal 24 may extend intermittently or continuously around the perimeter of the containment envelope 12. Preferably, the sealing elements 20,22 will be substantially covered by the folded portions of the envelope material, regardless of whether a surface sealing portion is formed, whereby the sealing elements 20,22 And does not form an outer contact surface for the storage envelope 12. [ Thus, the sealing elements 20,22 will be substantially isolated from other surfaces in the environment of use. This segregation of the sealing elements may be advantageous in that it not only maintains the integrity of the sealing elements but also prevents potential contamination of the outer surface from the material forming the sealing elements. In the illustrated exemplary structure, each of the sealing elements 20, 22 is also isolated from the interior of the receiving envelope 12. Thus, in practice, the wet wiper sheets 10 never make physical contact with the material forming the sealing elements 20,22. Thus, the possibility of contamination by the sealing elements is prevented.

As an example, and not for limiting the present invention, at least the first sealing element 20 may be made of a suitable material having a flexible nature and of a determined polarity, for example, a material such as polymeric ferrous oxide As shown in FIG. In an exemplary embodiment, the second sealing element 22 may be formed of a suitable material, such as polymeric iron oxide, having magnetism of opposite polarity to the first sealing element 20. In another exemplary embodiment, the second sealing element 22 may be a non-magnetic metal strip or other material having a magnetic attraction to the first sealing element 22. Each of the complementary sealing elements 20,22 can be secured in position on the surface of the deformable wall of the receiving envelope 12, by any technical means, including adhesives and the like, if desired. Thus, the opposing deformable walls of the containment envelope can form a support surface for the sealing elements 20,22. As will be appreciated, the opposing deformable walls of the containment envelope define the barrier 22 between the sealing elements and the wet wiper sheet 10, and the complementary sealing elements 20, 22 ), It is ensured that the wet wiper sheets 10 only come into contact with the material forming the receiving envelope.

Regardless of the arrangement of the sealing elements 20,22 the sealing elements are characterized by magnetic attraction to each other so that by pressing the first peripheral edge 16 together with the second peripheral edge 18, An effective magnetic seal is obtained that keeps the bell 12 closed (FIG. 2). In the sealed state, evaporation of the fluid wetting the wet wiper sheets can be substantially prevented. In this regard, the combined effective thickness of the envelope material between the sealing elements 20, 22 is such that even when the opposing surfaces of the envelope material are in contact with each other, . Of course, the effective thickness may vary depending on the strength of the magnetic force generated by the opposing sealing elements. In use, when the user manually pulls the first peripheral edge 16 and the second peripheral edge 18 away from each other and applies a shear force, the sealed state is released and the storage envelope 12 can be opened (Figure 1) . If the sealing system of the present invention employs the same film laminate as that used in the conventionally known flexible containment envelopes, evaporation in the sealed state is substantially prevented, so that, despite the periodic opening and closing during use, Is typically less than about 10% of the initial weight, with evaporation losses preferably being less than about 5%, and most preferably less than about 2%.

In the illustrated exemplary structure, the body of the receiving envelope 12 is preferably formed to include an end gusset 30 (only one shown) at each end, A non-gusseted end seam 32 is extended towards the end of the gusset. Such a structure facilitates packaging of relatively large volumes of wet wiper sheets 10 by expansion of the gussets 30, while preventing excess material from being present in the snout openings. For example, such a structure may be formed by folding a symmetrical panel 40 of the foil laminate material shown in Fig. 3 along this split fold line 42, Or by connecting surrounding edges overlapping in some other way to form a three-dimensional structure. Thereby, an envelope having the gusset shown in Figs. 1 and 2 is provided. Of course, any number of different structures may be used as needed.

The use of complementary sealing elements that form magnetic seals for the storage envelope 12 provide a number of advantageous advantages. For example, since the sealing portion has magnetic properties, there is no deterioration (weakening) of the sealing strength after several uses. This is in contrast to the case of adhesive seals or physical seals, which may deteriorate after several uses. Another advantage is that the seal can be easily made even if the user wears gloves. Another advantage is that there is less tendency for particles to occur because there is no sliding contact between different surfaces. In this regard, the reduction in particle generation can be particularly noticeable when the sealing elements 20, 22 are external to the receiving envelope. Another advantage is the ability to maintain chemical compatibility with solvents or other liquids for wetting. In this regard, the advantage of maintaining chemical compatibility is particularly pronounced when the sealing elements 20, 22 are external to the receiving envelope 12, since in this case the foil of the receiving envelope 12 Or only the other base material will come into contact with the solvent or other liquid for wetting. In addition, in such a structure, the seal is formed by face-to-face contact of a foil or other base material forming the storage envelope 12. The entrapment of any volatile emissions is increased because such materials may be impermeable to the solvent.

4 and 5 show another exemplary embodiment of the present invention. In this exemplary embodiment, a wipe container 130 includes a concave tray body 132 and has an integral flange 134 disposed about the upper peripheral edge of the tray body 132 . There is provided an optionally displaceable lid 136 that seats to cover the tray body 132. Both the tray body 132 and the lid 136 are made of polyethylene terephthalate (which is substantially impermeable to any solvent that wets the wet wiper sheets (not shown) PET, Mylar, high density polypropylene, and the like. If desired, the tray body 132 may be operatively connected to the lid 136 along a living hinge 140 or other hinge connection. Meanwhile, the tray body 132 and the lid 136 may be separate from each other regardless of the structure.

As shown, in the exemplary structure, magnetic strips or components of the first sealing elements 150, as described above, extend along the free edges of the lid 136 in a generally horseshoe- As shown in FIG. The constituent parts of the first sealing elements 150 may be formed of a suitable magnetic material such as a polymeric iron oxide or the like forming a magnet and may be formed by a lid forming a supporting structure by any technique, May be fixed at a position on the surface of the substrate 136.

As shown in FIG. 5, the components of the first sealing elements 150 may be covered by an upper cap structure 152. The upper cap structure 152 may be formed of the same material as the lid 136 and may be held in place by any suitable technique, including adhesive closure, melt bonding, and the like. However, other configurations of materials and attachment techniques may also be used. As a final configuration, the upper cap structure 152 may substantially encapsulate the components of the first sealing elements 150. [ Thus, the components of the first sealing elements 150 can be substantially isolated from other surfaces in the environment of use. Such an isolation may be advantageous in that it not only maintains the integrity of the sealing element but also prevents potential contamination from the material forming the constituent parts of the first sealing elements 150. Of course, it is also contemplated that, if necessary, the upper tapped structure can be removed.

As shown, the components of the first sealing elements 150 are arranged to be generally aligned with the surface of the flange 134 when the lid 136 is in the closed state. The components of the second sealing elements 160 may be disposed on the underside of the flange 134. In this regard, the components of the second sealing elements 160 may have a substantially mirror-symmetric pattern with respect to the components of the first sealing elements 150. Thus, in the illustrated exemplary structure, the components of the second sealing elements 160 have a generally horseshoe-shaped pattern. However, other patterns may be used.

In the illustrated embodiment, the components of the second sealing elements 160 may be formed of a suitable magnetic material, such as a polymeric iron oxide or the like, having a polarity opposite to that of the components of the first sealing elements 150. In other exemplary embodiments, the constituent parts of the second sealing elements 160 may be of a non-magnetic metal strip or other material having magnetic attraction to the constituent parts of the first sealing elements 150. It is also contemplated that a combination of a magnetic material and a non-magnetic material may be used in the constituent parts of the first sealing elements 150 and / or in the constituent parts of the second sealing elements 160. The components of the second sealing elements 160 can be secured in place below the flanges 134 that form the support structure by any technique, including adhesives and the like, if desired.

As shown in FIG. 5, the components of the second sealing elements 160 may be covered by a lower cap structure 162. The lower cap structure 162 may be formed of the same material as the tray body 132 and may be held in place by any suitable technique, including adhesive bonding, fusing, and the like. However, other constituent materials and attachment techniques may be used. As a final configuration, the lower cap structure 162 may substantially encapsulate the components of the second sealing elements 160. Thus, the components of the second sealing elements 160 can be substantially isolated from other surfaces in the environment of use. Such an isolation may be beneficial in that it not only maintains the integrity of the sealing element but also prevents potential contamination from the material forming the constituent parts of the second sealing elements 160. [ Of course, it is also contemplated that if desired, the lower tab structure 162 may be removed.

The components of the first sealing elements 150 and the components of the second sealing elements 160 are magnetic attraction so that when the lid 136 is pressed against the flange 134, The result is that the magnetic seal part is formed. In this regard, the combined effective thickness of the flange 134 and the lid 136 between the opposed magnetic strips 150, 160 is such that when the lower portion of the lid 136 contacts the upper surface of the flange 134 The magnetic sealing force is established and maintained. Of course, the effective thickness may vary depending on the strength of the magnetic force generated by the opposing sealing elements. In use, when the user pulls the lid 136 away from the flange 134 to apply a shear force, the sealing relationship is overcome and the container 130 is opened, allowing access to the interior. In this regard, regions outside the sealing elements can be formed with finger tabs that can be grasped by the user during the opening process.

As described above, in the illustrated exemplary arrangement, the complementary sealing elements 150, 160 are configured in a generally horseshoe pattern extending along the front and side edges of the container. In this configuration, the lid 136 may remain attached along the living hinge 140. Thus, the lid 136 can be lifted away from the tray body 132 to expose the access opening, and then the alignment of the opposing sealing elements can be reversed. Of course, any number of different patterns of magnetic strips may be similarly used as needed.

The invention may be better understood with reference to the following non-limiting comparative examples.

- Comparative Example -

Three samples of magnetic closed pouch packages were prepared by placing multiple wet wipers wetted with a mixture of 50% isopropanol and 50% acetone in a pouch. For comparison with the baseline control, a similar set of sample wet wipers were prepared, which were placed in a pouch of the same material construction as the magnetic closure pouch, . Each of the magnetic closing pouches was closed after briefly opening to simulate the withdrawal of the wet wiper once a day for 30 consecutive days, but in order to keep the load constant and to know the load change due to the loss of the solvent due to evaporation, Lt; / RTI > In order to determine the maximum solvent containment in a pouch structure of the same material, the control set of the sealed pouch wet wiper was not opened. The load of each pouch was then measured and recorded from the two sample sets. The analysis was performed by averaging the loads of the three pouches in each sample set and by calculating the change in mean load at the beginning of the test (day 0) for each day on which the measurement was performed. The results are shown in Table 1 below. As can be seen from Table 1, the magnetic sealing pouches recorded a loss of less than 1.5% of the initial weight compared to the completely sealed and unimpeded pouches under the same conditions.

Day (day) Sample load (Kg) Loss load (%) 0 0.8420 0.00% One 0.8416 -0.05% 2 0.8411 -0.11% 3 0.8407 -0.16% 4 0.8403 -0.21% 7 0.8396 -0.29% 8 0.8392 -0.33% 9 0.8386 -0.40% 10 0.8385 -0.42% 11 0.8380 -0.48% 14 0.8371 -0.58% 15 0.8369 -0.61% 16 0.8366 -0.64% 17 0.8361 -0.70% 18 0.8355 -0.77% 21 0.8354 -0.78% 22 0.8345 -0.89% 23 0.8341 -0.94% 24 0.8301 -1.42% 25 0.8329 -1.08% 28 0.8325 -1.12% 29 0.8323 -1.16% 30 0.8318 -1.21% 31 0.8313 -1.27% * Missing part in the order (day) means weekends, at which time no data was collected.

Of course, variations of the foregoing are also within the scope of the present invention. Accordingly, it is to be understood that the invention described herein embraces drawings and / or combinations of two or more of the individual contents mentioned or apparent from or on the above description. All of these various combinations constitute various alternative embodiments of the present invention. It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. The scope of the claims should be construed to cover alternative embodiments and equivalents within the scope of the present invention.

Claims (20)

CLAIMS 1. A containment package for presaturated wiper sheets, the package comprising:
A body substantially impermeable to liquids and vapors, the body having an interior configured to receive and store a plurality of wet wiper sheets pre-wetted with an evaporative solution, the access opening for insertion and withdrawal of the wet wiper sheets, A body;
At least one first sealing element forming a magnet supported on the first support structure at the inner, outer position; And
At least one second sealing element having a complementary magnetic attraction to the first sealing element, the second sealing element being disposed on the second support structure at an inner,
The second support structure may be selectively movable with respect to the first support structure to open and close the access opening and the first support structure may be moved in a state of being disposed in contact with the second support structure in an opposed relationship Wherein the first sealing element and the second sealing element cooperatively form a magnetic seal that reversibly seals the entry opening in a closed state by acting through the first and second support structures. The method according to claim 1,
Wherein the body is an expandable flexible envelope in which an entry opening is located between a first deformable wall of the envelope and a second deformable wall of the envelope, Wherein the wall defines a first support structure for supporting the first sealing element and the second deformable wall forms a second support structure for supporting the second sealing element. 3. The method of claim 2,
Wherein the flexible envelope is formed of a foil laminate material. 3. The method of claim 2,
The first sealing element is a magnetized strip disposed substantially parallel and substantially parallel to a first boundary edge of the access opening across the surface of the first deformable wall away from the interior,
Wherein the second sealing element is a magnetic strip disposed substantially parallel and substantially parallel to a second peripheral edge of the access opening across the surface of the second deformable wall away from the interior. 5. The method of claim 4,
Wherein the first peripheral edge is a folded edge and wherein a portion of the first deformable wall is an edge folded to cover the first sealing element. 6. The method of claim 5,
Wherein a portion of the first deformable wall folded to cover the first sealing element is secured to the body at a location below the first sealing element. 5. The method of claim 4,
Wherein the second peripheral edge is a folded edge, wherein a portion of the second deformable wall is folded to cover the second sealing element. 8. The method of claim 7,
And a portion of the second deformable wall folded to cover the second sealing element is fixed to the body at a position below the second sealing element. The method according to claim 1,
Wherein the body is a flexible envelope and an entry opening is located between the first deformable wall of the envelope and the second deformable wall of the envelope, The first deformable wall defining a first support structure and the second deformable wall defining a second support structure supporting the second seal element,
Wherein each of the first sealing element and the second sealing element comprises a flexible ferromagnetic material having magnetism and the first peripheral edge is a folded edge such that a portion of the first deformable wall covers the first sealing element, Wherein a portion of the first deformable wall folded to cover the first sealing element is fixed to the body at a location below the first sealing element and the second peripheral edge defines a portion of the second deformable wall, Wherein a portion of the second deformable wall folded to cover the second sealing element is secured to the body at a location below the second sealing element. The method according to claim 1,
Wherein the body is a tray having an access opening surrounded by perimeter walls and the flange extending outwardly away from the peripheral wall comprises a first support structure for supporting a first sealing element disposed over a lower portion of the flange, Wherein the detachable lid configured to cover the access opening forms a second support structure that supports a second sealing element disposed over an upper surface of the lid. 11. The method of claim 10,
The removable lid is operably connected to the tray along a living hinge. 12. The method of claim 11,
Wherein the first sealing element comprises a plurality of magnetic strips extending substantially along a first pattern around the periphery of the tray except the living hinge and the second sealing element comprises a plurality of magnetic strips extending substantially around the periphery of the lid except the living hinge, And a plurality of magnetic strips extending along a symmetrical pattern. 11. The method of claim 10,
Wherein the first sealing element is covered by a polymeric cap structure. 11. The method of claim 10,
Wherein the second sealing element is covered by a polymer cap structure. 11. The method of claim 10,
Wherein each of the first sealing element and the second sealing element is covered by a polymer cap structure. A storage package for wet wiper sheets,
A body substantially impermeable to liquids and vapors, the body having an interior configured to receive and store a plurality of wet wiper sheets pre-wetted with an evaporative solution, the openings for insertion and withdrawal of wet wiper sheets, Body;
At least one first magnetic strip disposed adjacent to an edge of the access opening and having a predetermined polarity, the first magnetic strip being supported on an outer surface of the first support structure at an inner, outer position thereof, Comprising: a first magnetic strip; And
At least one second magnetic strip having a polarity opposite to the polarity of the first magnetic strip, the second magnetic strip being disposed at an outer surface of the second support structure at an inner outer position thereof, And a second magnetic strip,
The second support structure may be selectively movable with respect to the first support structure to open and close the access opening and the first support structure may be moved in a state of being disposed in contact with the second support structure in an opposed relationship Wherein the first magnetic strip and the second magnetic strip cooperatively form a magnetic seal that reversibly seals the access opening in a closed state by acting through the first support structure and the second support structure. 17. The method of claim 16,
Wherein the body is an expandable flexible bell, and an entry opening is located between the first deformable wall of the envelope and the second deformable wall of the envelope, the first deformable wall defining a first magnetic strip Wherein the second deformable wall defines a second support structure for supporting the second magnetic strip. 18. The method of claim 17,
The first magnetic strip being disposed substantially parallel and adjacent to the first peripheral edge of the access opening over the surface of the first deformable wall away from the interior,
Wherein the second magnetic strip is disposed substantially parallel and adjacent to a second peripheral edge of the access opening across the surface of the second deformable wall away from the interior. 17. The method of claim 16,
Wherein the body is a tray having an access opening surrounded by peripheral walls and the flange extending outwardly away from the peripheral wall forms a first support structure for supporting a first magnetic strip disposed over a lower portion of the flange, A detachable lid configured to cover the access opening forms a second support structure for supporting a second magnetic strip disposed over an upper surface of the lid,
The removable lid is operatively connected to the tray along a living hinge,
Wherein a plurality of magnetic strips extend along a first pattern around a substantial circumference of the tray excluding the living hinge and a plurality of magnetic strips extend along a substantially symmetrical pattern around a periphery of the lid excluding the living hinge, package. A method of packaging wet wiper sheets,
(a) providing a storage package; And
(b) storing the wet wiper sheets in the storage package,
The storage package comprises:
A body substantially impermeable to liquids and vapors, the body having an interior configured to receive and store a plurality of wet wiper sheets pre-wetted with an evaporative solution, the openings for insertion and withdrawal of wet wiper sheets, Body;
At least one first sealing element forming a magnet supported on the first support structure at the inner, outer position; And
At least one second sealing element having a complementary magnetic attraction to the first sealing element, the second sealing element being disposed on the second support structure at an inner,
The second support structure may be selectively movable with respect to the first support structure to open and close the access opening and the first support structure may be moved in a state of being disposed in contact with the second support structure in an opposed relationship Wherein the first sealing element and the second sealing element cooperatively form a magnetic seal that reversibly seals the entry opening in a closed state by acting through the first and second support structures.

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