CA2663092A1 - Valve element - Google Patents
Valve element Download PDFInfo
- Publication number
- CA2663092A1 CA2663092A1 CA002663092A CA2663092A CA2663092A1 CA 2663092 A1 CA2663092 A1 CA 2663092A1 CA 002663092 A CA002663092 A CA 002663092A CA 2663092 A CA2663092 A CA 2663092A CA 2663092 A1 CA2663092 A1 CA 2663092A1
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- CA
- Canada
- Prior art keywords
- valve element
- base layer
- way valve
- top layer
- semi
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/14—Check valves with flexible valve members
- F16K15/144—Check valves with flexible valve members the closure elements being fixed along all or a part of their periphery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
- B65D77/22—Details
- B65D77/225—Pressure relief-valves incorporated in a container wall, e.g. valves comprising at least one elastic element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2205/00—Venting means
Abstract
The valve element includes a base layer having an aperture disposed there-through and a flexible top layer overlaying and joined to the base layer so as to cover the aperture. The base layer and top layer are further joined so as to provide an expandable and collapsible channel between the aperture and an exit point on the valve element. In its normal condition, to seal closed the valve element, the channel is collapsed and the base and top layer adjacent one- another. To facilitate sealing of the valve element, a semi-rigid sealant material is provided in the channel in sealing contact with the base layer and the top layer. In operation, air entering the aperture displaces the top layer and expands the channel, allowing the air to pass across the semi- solid sealant material and into the environment. The valve element may be used with storage containers, such as food storage bags.
Description
VALVE ELEMENT
FIELD OF THE INVENTION
[0001] The invention relates generally to valve elements and more particularly to multi-ply, one-way valve elements adapted for use with air and similar gasses. The invention fmds particular applicability in the field of flexible storage bags used for storing food items.
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
[0001] The invention relates generally to valve elements and more particularly to multi-ply, one-way valve elements adapted for use with air and similar gasses. The invention fmds particular applicability in the field of flexible storage bags used for storing food items.
BACKGROUND OF THE INVENTION
[0002] One type of one-way valve element commonly used with containers to store coffee beans is a generally planar structure constructed from two or more plies or layers of flexible, thermoplastic film. A first layer or base layer has an aperture disposed there=through while a second layer or top layer is stretched over and joined to the base layer to normally cover the aperture. During evacuation, air is moved through the aperture and displaces the flexible top layer with respect to base layer thereby allowing the evacuating air to escape to the environment.
After evacuation, the resilient top layer returns to its normal position overlying and covering the aperture.
After evacuation, the resilient top layer returns to its normal position overlying and covering the aperture.
[0003] In some embodiments, silicone oil may be applied between the layers to assist in sealing of the valve element. Silicone oils, though, demonstrate liquid-like properties that allows them to leak from the valve element to an adjacent surface. For this reason, the silicone oil cannot be applied during the manufacture of the valve and wound on a roll.
Thus, the silicone oil is applied at the point of attachment of the valve element to the container.
BRIEF SUMMARY OF THE INVENTION
Thus, the silicone oil is applied at the point of attachment of the valve element to the container.
BRIEF SUMMARY OF THE INVENTION
[0004] The invention provides a novel one-way valve element that can be used for evacuating flexible storage bags. The invention also provides a flexible storage bag that employs the novel valve element disclosed herein. The one-way valve element according to the invention is made from multiple plies or layers including a base layer having an aperture disposed through it and a top layer overlying and joined to the base layer so as to cover the aperture. Also, the base layer and top layer are further joined so as to provide an alternately expandable and collapsible channel between the aperture and an exit point on the valve element that communicates with the surrounding environment.
[0005] In use, the valve element is attached to the flexible sidewall of a storage bag such that the aperture aligns with a hole disposed through the sidewall, thereby establishing communication between the valve element and the interior volume. To maintain the sealed integrity of the interior volume, in the valve element's normal condition, the top layer is positioned over the base layer thereby collapsing the channel and simultaneously covering the aperture. During evacuation, air from the interior volume passes through the aperture thus displacing the top tayer with respect to the base layer and thereby expanding the channel. Air then passes via the channel to the exit point on the valve element to escape to the environment.
To assist in forming the seal created between the base layer and the top layer when the channel is in its normally collapsed state, the valve element includes a senii-rigid sealant material located in the channel.
To assist in forming the seal created between the base layer and the top layer when the channel is in its normally collapsed state, the valve element includes a senii-rigid sealant material located in the channel.
[0006] An advantage of the invention is that the semi-rigid material is less susceptible to displacement within or leaking from the valve element during evacuation.
Another advantage is that the semi-rigid material can be applied during manufacture of the valve element thereby eliminating the step of applying silicone oil during construction of the bag.
These and other advantages and features of the invention will become apparent from the detailed description and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Another advantage is that the semi-rigid material can be applied during manufacture of the valve element thereby eliminating the step of applying silicone oil during construction of the bag.
These and other advantages and features of the invention will become apparent from the detailed description and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 is a perspective view of a flexible bag having attached to the sidewall and communicating with the interior volume a one-way valve element designed in accordance with the teachings of the invention.
[0008] Figure 2 is an exploded view of the one-way valve element of Figure 1 illustrated in relationship to the flexible bag.
[0009] Figure 3 is a cross-sectional view of the one-way valve element taken along line A-A
of Figure 1 and illustrating the channel in the normally collapsed configuration.
of Figure 1 and illustrating the channel in the normally collapsed configuration.
[0010] Figure 4 is a cross-sectional view of the one-way valve element taken along line A-A
of Figure 1 and illustrating the channel in the expanded configuration.
of Figure 1 and illustrating the channel in the expanded configuration.
[0011] Figure 5 is an exploded view of another embodiment of a valve element.
[0012] Figure 6 is a cross-sectional view of the valve element of Figure 5 and illustrating the channel in the normally collapsed configuration.
[0013] Figure 7 is a cross-sectional view of the valve element of Figure 5 and illustrating the channel in the expanded configuration.
[0014] Figure 8 is a perspective view of another embodiment of a valve element.
[0015] Figure 9 is a perspective view of the opposite side of the valve element shown in Figure 8.
[00161. Figure 10 is cross-sectional view of the valve element shown in Figure 8.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] Now referring to the drawings, wherein like reference numbers refer to like elements, there is illustrated in FIG. 1 a storage bag 100 for storing items such as food stuffs. In the illustrated embodiment, the storage bag 100 is made from a first sidewall 102 and an opposing second sidewall 104 overlying the first side wall to provide an interior volume 106 therebetween.
The first and second sidewalls 102, 104 are joined along a first side edge 110, a parallel or non-parallel second side edge 112, and a closed bottom edge 114 that extends between the first and second side edges. The first and/or second sidewalls 102, 104 may be made from a flexible or pliable thermoplastic material formed or drawn into a smooth, thin walled sheet. Examples of suitable thermoplastic materials include high density polyethylene (HDPE), low density polyethylene (LDPE), polypropylene (PP), ethylene vinyl acetate (EVA), nylon, polyester, polyamide, ethylene vinyl alcohol, and can be formed in single or multiple layers. The thermoplastic material can be transparent, translucent, opaque, or tinted.
Furthermore, the material used for the sidewalls can be a gas impermeable material. The sidewalls 102, 104 can be joined along the first and second side edges 110, 112 and bottom edge 114 by any suitable process such as, for example, heat sealing.
[0018] For accessing the interior volume 106, the top edges 120, 122 of the first and second sidewalls 102, 104 remain un-joined to define an opening 124. To seal the opening 124, first and second interlocking fastening strips 126, 128 can be attached to the interior surfaces of the respective first and second sidewalls 102, 104. The first and second fastening strips 126, 128 extend generally between the first and second side edges 110, 112 parallel to and spaced below the top edges 120, 122. In other embodiments, the bag 100 can include a movable slider straddling the fastening strips 126, 128 to facilitate occluding and deoccluding of the opening 124.
[0019] To evacuate the storage bag 100 of latent or entrapped air after the opening has been closed, a one-way valve element 130 designed in accordance with the teachings of the invention is provided. The valve element 130 is attached to the first flexible sidewall 102 and communicates with the interior volume 106. In one embodiment, the one-way valve element 130 is configured to open under an applied pressure differential thereby allowing air from the interior volume 106 to escape and to close after elimination or reduction of the pressure differential thereby preventing the ingress of environmental air into the interior volume.
To establish the pressure differential, a vacuum device can be used. For example, as illustrated in FIG. 1, the vacuum device 132 is configured as a hand-held, electrically operated device having a nozzle 134. When activated, the vacuum device draws air from the interior volume 106 through the valve element 130. In other embodiments, the pressure differential can be provided by applying a compressive force to the flexible sidewalls 102, 104 thereby forcing air from the internal volume through the valve element.
[0020] Referring to FIG. 2, the multi-ply valve element 130 includes a base layer 142 and a corresponding top layer 144. The base layer and top layer can be made from any suitable material such as, for example, a flexible, transparent, thermoplastic film.
Additionally, the base layer and the top layer can be made from the same or different materials. The base layer 142 is circular with an aperture 146 disposed through its center such that the base layer appears annular in shape. The top layer 144 is positioned over and secured to the base layer 142 so as to cover the aperture 146. Moreover, the top layer 144 also corresponds in size and shape to the base layer 142 such that the two layers provide a circular periphery 148 for the valve element. Of course, it will be readily recognized that in other embodiments the valve element can have any other suitable shape including any of various polygonal shapes.
[0021] To secure the top layer 144 to the base layer 142, in the embodiment illustrated in FIG. 2, two parallel strips of adhesive 150 are applied to the base layer extending along either side of the aperture 146. The un-adhered portions of the top and base layers 142, 144 are located between the two adhesive strips 150. The un-adhered portions provide an expandable and collapsible channel 152 that extends from the aperture 146 to opposing exit points at the periphery 148 of the valve element 130. The valve element 130 is then adhered by a ring of adhesive 158 (indicated by phantom lines on the underside of the base layer 142) to the flexible bag 100 so as to cover the hole 156 disposed through the first sidewall 102.
Once attached, the aperture 146 should align with the hole 156. Of course, as will be readily apparent to those of slcill in the art, in other embodiments, other suitable joining methods besides or in addition to adhesive can be employed to secure together the base and top layers, and the base layer to the sidewall, for instance, heat sealing.
[0022] Referring to FIG. 3, to prevent air from the environment from entering into the interior volume 106, the channel 152 is normally in a collapsed condition with the top layer covering the aperture 146. During evacuation, air from the internal volume 106 will pass through the hole 156 in the first sidewall 102 and through the aperture 146 in the base layer 142.
This evacuating air partially displaces the top layer 144 from the base layer 142 and thereby places the channel 152 into the expanded condition illustrated in FIG. 4. The air can then pass along the expanded channel 152 formed between the adhesive strips 150 to the periphery of the valve element and escapes to the environment. Once evacuation is completed, the resilient top layer 144 will return to its prior configuration covering and sealing the aperture 146 and thereby collapsing the channel 152.
[0023] In accordance with the invention, to facilitate the functioning of the valve element, a semi-rigid sealant material is included between the base layer and top layer.
More particularly, referring to FIG. 2, the semi-rigid sealant material 160 can be applied onto the base layer 142 between the parallel strips of adhesive 148. Furthermore, the semi-rigid sealant material 160 may extend from proximate the aperture 146 to the exit points at the periphery 148.
[0024] The semi-rigid sealant material may demonstrate rigid characteristics that help it generally retain its shape even when encountering displacement forces. Such a material may be freestanding and will not flow like a liquid. However, the semi-rigid sealant material may also retain some resilient or compressive properties to facilitate sealing between the valve element layers. By way of example, a gel can be employed as a suitable material for the semi-rigid sealant material. Examples of suitable gels include hydrocarbon gels such as Versagel available from Penreco, gel adhesive such as the material designated as 555-8808 available from National Starch and Chemical Company, or the material designated as Lite Loc from National Starch and Chemical Company, petrolatums, and jellies. Typically, such gels include at least one block copolymer that will bind to a liquid such as a mineral oil thereby enabling the oil to become semi-rigid. Additionally, the semi-rigid sealant material can be a thermoplastic elastomer such as Dynaflex available from GLS Corporation. By way of another example, the semi-rigid sealant material may have a hardness, using the Shore 00 hardness scale, in the range of 0 to 70 points.
The hardness may be in a second range of 30 to 70 points. In one embodiment, hardness may be 60 points.
[0025] Referring to FIG. 3, when the channel 152 is in the normally collapsed position, the top layer 144 sealingly contacts the semi-rigid sealant material 160. Thus, as will be appreciated from FIG. 3, the presence of the semi-rigid sealant material 160 offsets the gap that would otherwise exist due to the thickness of the adhesive strips 150. During evacuation, the flexible top layer 144 displaces with respect to the semi-rigid sealant material 160 as well as the base layer 142 thereby providing the expanded channel 152. Due to its semi-rigid characteristics and attachment to the base layer 142, the semi-rigid sealant material 160 will remain in place even as the evacuating air passes across it. It should be appreciated that in other embodiments, if the semi-rigid material 160 demonstrates sufficient flexibility, it can also be applied to and flex with the top layer 144.
[0026] In addition to remaining in place during evacuation, another advantage of the semi-rigid sealant material is that the material may demonstrate a light tact property. The light tact property will facilitate the sealing contact between the semi-rigid sealant material and the displaceable layer, but still allow the channel to expand when a sufficient evacuation force is applied. A fitrther advantage of employing the semi-rigid sealant material is that it can be applied to the base layer at about the same time that adhesive strips are applied. The semi-rigid characteristics will allow the sealant material to remain located between the valve element layers during subsequent processing of the valve element and the storage bag.
[0027] In another embodiment, the semi-rigid material may be used in a flexible valve that consists of only a top layer and is applied over the aperture in the sidewall.
FIG. 5 shows one embodiment of a valve element with the top layer applied over the aperture.
The valve element 230 has a top layer 244. The valve element 230 does not have a base layer. The sidewall 202 has an aperture 256. To secure the top layer 244 to the sidewall 202, two parallel strips of adhesive 250 may be applied to the top layer. The un-adhered portions of the sidewall 202 and top layer 244 are located between the two adhesive strips 250. The un-adhered portions provide an expandable and collapsible channel 252.
[0028] Referring to FIG. 6, to prevent air from the environment from entering into the interior volume 206, the channel 252 is normally in a collapsed condition with the top layer covering the aperture 256. During evacuation, air from the internal volume 206 will pass through the hole 256 in the first sidewall 202. This evacuating air partially displaces the top layer 244 from the sidewall 202 and thereby places the channel 252 into the expanded condition illustrated in FIG. 7. The air can then pass along the expanded channel 252 formed between the adhesive strips 250 to the periphery of the valve element and escapes in the environment. Once evacuation is completed the resilient top layer 244 will return to its prior configuration covering and sealing the aperture 256 and thereby collapsing the channel 252.
[0029] In accordance with the invention, to facilitate the functioning of the valve element, a semi-rigid sealant material is included between the sidewall and the top layer. More particularly, referring to FIG. 5, the semi-rigid sealant material 260 can be applied onto the top layer 244 between the parallel strips of adhesive 250. Furthermore, the semi-rigid sealant material 260 may extend from proximate the aperture 256 to the exit points at the periphery 248.
[0030] Referring to FIG. 6, when the channel 252 is in the normally collapsed position, the top layer 244 sealingly contacts the semi-rigid sealant material 260. Thus, as will be appreciated from FIG. 6, the presence of the semi-rigid sealant material 260 offsets the gap that would otherwise exist due to the thickness of the adhesive strips 250. During evacuation, the flexible top layer 244 displaces with respect to the semi-rigid sealant material 260 as well as the sidewall 202 thereby providing the expanded channel 252. Due to its semi-rigid characteristics and attachment to the top layer 244, the semi-rigid sealant material 260 will remain in place even as the evacuating air passes across it. It should be appreciated that in other embodiments, the semi-rigid materia1260 can be applied to the sidewa11102.
[0031] In an additional embodiment, the semi-rigid sealant material may be used in a rigid valve. Referring to FIGS. 8, 9, and 10, the one-way valve element 300 for use with a storage bag of the foregoing type can include a rigid valve body 310 that cooperates with a movable disk 312 to open and close the valve element. The valve body 310 includes a circular flange portion 314 extending between parallel first and second flange faces 320, 322.
Concentric to the flange portion 314 and projecting from the second flange face 322 is a circular boss portion 318 which terminates in a planar boss face 324 that is parallel to the first and second flange faces. The circular boss portion 318 is smaller in diameter than the flange portion 314 so that the outermost annular rim of the second flange face 322 remains exposed. The valve body 310 canbe made from any suitable material such as a moldable thermoplastic material like nylon, HDPE, high impact polystyrene (HIPS), polycarbonates (PC), and the like. -[0032] Disposed concentrically into the valve body 310 is a counter-bore 328.
The counter-bore 328 extends from the first flange face 320 part way towards the boss face 324. The counter-bore 328 defines a cylindrical bore wal1330. Because it extends only part way toward the boss face 324, the counter-bore 328 forms within the valve body 310 a preferably planar valve seat 332. To establish fluid communication across the valve body 310, there is disposed through the valve seat 332 at least one aperture 334. In fact, in the illustrated embodiment, a plurality of apertures 334 are arranged concentrically and spaced inwardly from the cylindrical bore wall 330.
[0033] To cooperatively accommodate the movable disk 312, the disk is inserted into the counter-bore 328. Accordingly, the disk 312 is preferably smaller in diameter than the counter-bore 328 and has a thickness as measured between a first disk face 340 and a second disk face 342 that is substantially less than the length of the counter-bore 328 between the first flange face 320 and the valve seat 332. To retain the disk 312 within the counter-bore 328, there is formed proximate to the first flange face 320 a plurality of radially inward extending fingers 344. The disk 312 can be made from any suitable material such as, for example, a resilient elastomer.
[0034] Referring to FIG. 10, when the disk 312 within the counter-bore 328 is moved adjacent to the fingers 344, the valve element 300 is in its open configuration allowing air to communicate between the first flange face 320 and the boss face 324. However, when the disk 312 is adjacent the valve seat 332 thereby covering the apertures 334, the valve element 300 is in its closed configuration. To assist in sealing the disk 312 over the apertures 334, a semi-rigid sealant material 360 can be applied to the valve seat 332. In other embodiments, the sealant material 360 may be applied to the disk 312, such as the disk face 342.
Furtherinore, a foam or other resilient member may be placed in the counter-bore 328 to provide a tight fit of the disk 312 and the valve seat 332 in the closed position.
[0035] To attach the valve element 600 to the first sidewall, referring to FIG. 9, an adhesive can be applied to the exposed annular rim portion of the second flange face 322. The valve element 300 can then be placed adjacent the exterior surface of the first sidewall with the boss portion 318 being received through the hole disposed into the sidewall and thereby pass into the internal volume. Of course, in other embodiments, adhesive can be placed on other portions of the valve element, such as the first flange face, prior to attachment to the sidewall.
[0036] All references, including publications, patent applications, and patents, cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.
[0037] The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms "comprising," "having," "including," and "containing"
are to be construed as open-ended terms (i.e., meaning "including, but not limited to,") unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., "such as") provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
[0038] Preferred embodiments of this invention are described herein, including the best mode known to the inventor(s) for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventor(s) expect skilled artisans to employ such variations as appropriate, and the inventor(s) intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as pernlitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
[00161. Figure 10 is cross-sectional view of the valve element shown in Figure 8.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] Now referring to the drawings, wherein like reference numbers refer to like elements, there is illustrated in FIG. 1 a storage bag 100 for storing items such as food stuffs. In the illustrated embodiment, the storage bag 100 is made from a first sidewall 102 and an opposing second sidewall 104 overlying the first side wall to provide an interior volume 106 therebetween.
The first and second sidewalls 102, 104 are joined along a first side edge 110, a parallel or non-parallel second side edge 112, and a closed bottom edge 114 that extends between the first and second side edges. The first and/or second sidewalls 102, 104 may be made from a flexible or pliable thermoplastic material formed or drawn into a smooth, thin walled sheet. Examples of suitable thermoplastic materials include high density polyethylene (HDPE), low density polyethylene (LDPE), polypropylene (PP), ethylene vinyl acetate (EVA), nylon, polyester, polyamide, ethylene vinyl alcohol, and can be formed in single or multiple layers. The thermoplastic material can be transparent, translucent, opaque, or tinted.
Furthermore, the material used for the sidewalls can be a gas impermeable material. The sidewalls 102, 104 can be joined along the first and second side edges 110, 112 and bottom edge 114 by any suitable process such as, for example, heat sealing.
[0018] For accessing the interior volume 106, the top edges 120, 122 of the first and second sidewalls 102, 104 remain un-joined to define an opening 124. To seal the opening 124, first and second interlocking fastening strips 126, 128 can be attached to the interior surfaces of the respective first and second sidewalls 102, 104. The first and second fastening strips 126, 128 extend generally between the first and second side edges 110, 112 parallel to and spaced below the top edges 120, 122. In other embodiments, the bag 100 can include a movable slider straddling the fastening strips 126, 128 to facilitate occluding and deoccluding of the opening 124.
[0019] To evacuate the storage bag 100 of latent or entrapped air after the opening has been closed, a one-way valve element 130 designed in accordance with the teachings of the invention is provided. The valve element 130 is attached to the first flexible sidewall 102 and communicates with the interior volume 106. In one embodiment, the one-way valve element 130 is configured to open under an applied pressure differential thereby allowing air from the interior volume 106 to escape and to close after elimination or reduction of the pressure differential thereby preventing the ingress of environmental air into the interior volume.
To establish the pressure differential, a vacuum device can be used. For example, as illustrated in FIG. 1, the vacuum device 132 is configured as a hand-held, electrically operated device having a nozzle 134. When activated, the vacuum device draws air from the interior volume 106 through the valve element 130. In other embodiments, the pressure differential can be provided by applying a compressive force to the flexible sidewalls 102, 104 thereby forcing air from the internal volume through the valve element.
[0020] Referring to FIG. 2, the multi-ply valve element 130 includes a base layer 142 and a corresponding top layer 144. The base layer and top layer can be made from any suitable material such as, for example, a flexible, transparent, thermoplastic film.
Additionally, the base layer and the top layer can be made from the same or different materials. The base layer 142 is circular with an aperture 146 disposed through its center such that the base layer appears annular in shape. The top layer 144 is positioned over and secured to the base layer 142 so as to cover the aperture 146. Moreover, the top layer 144 also corresponds in size and shape to the base layer 142 such that the two layers provide a circular periphery 148 for the valve element. Of course, it will be readily recognized that in other embodiments the valve element can have any other suitable shape including any of various polygonal shapes.
[0021] To secure the top layer 144 to the base layer 142, in the embodiment illustrated in FIG. 2, two parallel strips of adhesive 150 are applied to the base layer extending along either side of the aperture 146. The un-adhered portions of the top and base layers 142, 144 are located between the two adhesive strips 150. The un-adhered portions provide an expandable and collapsible channel 152 that extends from the aperture 146 to opposing exit points at the periphery 148 of the valve element 130. The valve element 130 is then adhered by a ring of adhesive 158 (indicated by phantom lines on the underside of the base layer 142) to the flexible bag 100 so as to cover the hole 156 disposed through the first sidewall 102.
Once attached, the aperture 146 should align with the hole 156. Of course, as will be readily apparent to those of slcill in the art, in other embodiments, other suitable joining methods besides or in addition to adhesive can be employed to secure together the base and top layers, and the base layer to the sidewall, for instance, heat sealing.
[0022] Referring to FIG. 3, to prevent air from the environment from entering into the interior volume 106, the channel 152 is normally in a collapsed condition with the top layer covering the aperture 146. During evacuation, air from the internal volume 106 will pass through the hole 156 in the first sidewall 102 and through the aperture 146 in the base layer 142.
This evacuating air partially displaces the top layer 144 from the base layer 142 and thereby places the channel 152 into the expanded condition illustrated in FIG. 4. The air can then pass along the expanded channel 152 formed between the adhesive strips 150 to the periphery of the valve element and escapes to the environment. Once evacuation is completed, the resilient top layer 144 will return to its prior configuration covering and sealing the aperture 146 and thereby collapsing the channel 152.
[0023] In accordance with the invention, to facilitate the functioning of the valve element, a semi-rigid sealant material is included between the base layer and top layer.
More particularly, referring to FIG. 2, the semi-rigid sealant material 160 can be applied onto the base layer 142 between the parallel strips of adhesive 148. Furthermore, the semi-rigid sealant material 160 may extend from proximate the aperture 146 to the exit points at the periphery 148.
[0024] The semi-rigid sealant material may demonstrate rigid characteristics that help it generally retain its shape even when encountering displacement forces. Such a material may be freestanding and will not flow like a liquid. However, the semi-rigid sealant material may also retain some resilient or compressive properties to facilitate sealing between the valve element layers. By way of example, a gel can be employed as a suitable material for the semi-rigid sealant material. Examples of suitable gels include hydrocarbon gels such as Versagel available from Penreco, gel adhesive such as the material designated as 555-8808 available from National Starch and Chemical Company, or the material designated as Lite Loc from National Starch and Chemical Company, petrolatums, and jellies. Typically, such gels include at least one block copolymer that will bind to a liquid such as a mineral oil thereby enabling the oil to become semi-rigid. Additionally, the semi-rigid sealant material can be a thermoplastic elastomer such as Dynaflex available from GLS Corporation. By way of another example, the semi-rigid sealant material may have a hardness, using the Shore 00 hardness scale, in the range of 0 to 70 points.
The hardness may be in a second range of 30 to 70 points. In one embodiment, hardness may be 60 points.
[0025] Referring to FIG. 3, when the channel 152 is in the normally collapsed position, the top layer 144 sealingly contacts the semi-rigid sealant material 160. Thus, as will be appreciated from FIG. 3, the presence of the semi-rigid sealant material 160 offsets the gap that would otherwise exist due to the thickness of the adhesive strips 150. During evacuation, the flexible top layer 144 displaces with respect to the semi-rigid sealant material 160 as well as the base layer 142 thereby providing the expanded channel 152. Due to its semi-rigid characteristics and attachment to the base layer 142, the semi-rigid sealant material 160 will remain in place even as the evacuating air passes across it. It should be appreciated that in other embodiments, if the semi-rigid material 160 demonstrates sufficient flexibility, it can also be applied to and flex with the top layer 144.
[0026] In addition to remaining in place during evacuation, another advantage of the semi-rigid sealant material is that the material may demonstrate a light tact property. The light tact property will facilitate the sealing contact between the semi-rigid sealant material and the displaceable layer, but still allow the channel to expand when a sufficient evacuation force is applied. A fitrther advantage of employing the semi-rigid sealant material is that it can be applied to the base layer at about the same time that adhesive strips are applied. The semi-rigid characteristics will allow the sealant material to remain located between the valve element layers during subsequent processing of the valve element and the storage bag.
[0027] In another embodiment, the semi-rigid material may be used in a flexible valve that consists of only a top layer and is applied over the aperture in the sidewall.
FIG. 5 shows one embodiment of a valve element with the top layer applied over the aperture.
The valve element 230 has a top layer 244. The valve element 230 does not have a base layer. The sidewall 202 has an aperture 256. To secure the top layer 244 to the sidewall 202, two parallel strips of adhesive 250 may be applied to the top layer. The un-adhered portions of the sidewall 202 and top layer 244 are located between the two adhesive strips 250. The un-adhered portions provide an expandable and collapsible channel 252.
[0028] Referring to FIG. 6, to prevent air from the environment from entering into the interior volume 206, the channel 252 is normally in a collapsed condition with the top layer covering the aperture 256. During evacuation, air from the internal volume 206 will pass through the hole 256 in the first sidewall 202. This evacuating air partially displaces the top layer 244 from the sidewall 202 and thereby places the channel 252 into the expanded condition illustrated in FIG. 7. The air can then pass along the expanded channel 252 formed between the adhesive strips 250 to the periphery of the valve element and escapes in the environment. Once evacuation is completed the resilient top layer 244 will return to its prior configuration covering and sealing the aperture 256 and thereby collapsing the channel 252.
[0029] In accordance with the invention, to facilitate the functioning of the valve element, a semi-rigid sealant material is included between the sidewall and the top layer. More particularly, referring to FIG. 5, the semi-rigid sealant material 260 can be applied onto the top layer 244 between the parallel strips of adhesive 250. Furthermore, the semi-rigid sealant material 260 may extend from proximate the aperture 256 to the exit points at the periphery 248.
[0030] Referring to FIG. 6, when the channel 252 is in the normally collapsed position, the top layer 244 sealingly contacts the semi-rigid sealant material 260. Thus, as will be appreciated from FIG. 6, the presence of the semi-rigid sealant material 260 offsets the gap that would otherwise exist due to the thickness of the adhesive strips 250. During evacuation, the flexible top layer 244 displaces with respect to the semi-rigid sealant material 260 as well as the sidewall 202 thereby providing the expanded channel 252. Due to its semi-rigid characteristics and attachment to the top layer 244, the semi-rigid sealant material 260 will remain in place even as the evacuating air passes across it. It should be appreciated that in other embodiments, the semi-rigid materia1260 can be applied to the sidewa11102.
[0031] In an additional embodiment, the semi-rigid sealant material may be used in a rigid valve. Referring to FIGS. 8, 9, and 10, the one-way valve element 300 for use with a storage bag of the foregoing type can include a rigid valve body 310 that cooperates with a movable disk 312 to open and close the valve element. The valve body 310 includes a circular flange portion 314 extending between parallel first and second flange faces 320, 322.
Concentric to the flange portion 314 and projecting from the second flange face 322 is a circular boss portion 318 which terminates in a planar boss face 324 that is parallel to the first and second flange faces. The circular boss portion 318 is smaller in diameter than the flange portion 314 so that the outermost annular rim of the second flange face 322 remains exposed. The valve body 310 canbe made from any suitable material such as a moldable thermoplastic material like nylon, HDPE, high impact polystyrene (HIPS), polycarbonates (PC), and the like. -[0032] Disposed concentrically into the valve body 310 is a counter-bore 328.
The counter-bore 328 extends from the first flange face 320 part way towards the boss face 324. The counter-bore 328 defines a cylindrical bore wal1330. Because it extends only part way toward the boss face 324, the counter-bore 328 forms within the valve body 310 a preferably planar valve seat 332. To establish fluid communication across the valve body 310, there is disposed through the valve seat 332 at least one aperture 334. In fact, in the illustrated embodiment, a plurality of apertures 334 are arranged concentrically and spaced inwardly from the cylindrical bore wall 330.
[0033] To cooperatively accommodate the movable disk 312, the disk is inserted into the counter-bore 328. Accordingly, the disk 312 is preferably smaller in diameter than the counter-bore 328 and has a thickness as measured between a first disk face 340 and a second disk face 342 that is substantially less than the length of the counter-bore 328 between the first flange face 320 and the valve seat 332. To retain the disk 312 within the counter-bore 328, there is formed proximate to the first flange face 320 a plurality of radially inward extending fingers 344. The disk 312 can be made from any suitable material such as, for example, a resilient elastomer.
[0034] Referring to FIG. 10, when the disk 312 within the counter-bore 328 is moved adjacent to the fingers 344, the valve element 300 is in its open configuration allowing air to communicate between the first flange face 320 and the boss face 324. However, when the disk 312 is adjacent the valve seat 332 thereby covering the apertures 334, the valve element 300 is in its closed configuration. To assist in sealing the disk 312 over the apertures 334, a semi-rigid sealant material 360 can be applied to the valve seat 332. In other embodiments, the sealant material 360 may be applied to the disk 312, such as the disk face 342.
Furtherinore, a foam or other resilient member may be placed in the counter-bore 328 to provide a tight fit of the disk 312 and the valve seat 332 in the closed position.
[0035] To attach the valve element 600 to the first sidewall, referring to FIG. 9, an adhesive can be applied to the exposed annular rim portion of the second flange face 322. The valve element 300 can then be placed adjacent the exterior surface of the first sidewall with the boss portion 318 being received through the hole disposed into the sidewall and thereby pass into the internal volume. Of course, in other embodiments, adhesive can be placed on other portions of the valve element, such as the first flange face, prior to attachment to the sidewall.
[0036] All references, including publications, patent applications, and patents, cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.
[0037] The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms "comprising," "having," "including," and "containing"
are to be construed as open-ended terms (i.e., meaning "including, but not limited to,") unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., "such as") provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
[0038] Preferred embodiments of this invention are described herein, including the best mode known to the inventor(s) for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventor(s) expect skilled artisans to employ such variations as appropriate, and the inventor(s) intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as pernlitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
Claims (15)
1. A one-way valve element comprising:
a base layer having an aperture disposed therein;
a top layer joined to the base layer and covering the aperture, the top layer and base layer being joined so as to provide an expandable and collapsible channel between the aperture and an exit point on the valve element; and a semi-rigid sealant material in the channel to seal between the top layer and base layer.
a base layer having an aperture disposed therein;
a top layer joined to the base layer and covering the aperture, the top layer and base layer being joined so as to provide an expandable and collapsible channel between the aperture and an exit point on the valve element; and a semi-rigid sealant material in the channel to seal between the top layer and base layer.
2. The one-way valve element of claim 1, wherein the semi-rigid sealant material is a gel.
3. The one-way valve element of claim 2, wherein the gel is selected from the group consisting of a hydrocarbon gel, a gel adhesive, a petrolatum, and a jelly.
4. The one-way valve element of claim 1, wherein the semi-rigid sealant material has a hardness of between about 0 to about 70 points on the Shore 00 hardness scale.
5. The one-way valve element of claim 1, wherein the semi-rigid sealant material is a thermoplastic elastomer.
6. The one-way valve element of claim 1, wherein the valve element including the base layer and the top layer are circular in shape.
7. The one-way valve element of claim 6, wherein the exit point is on the perimeter of the valve element.
8. The one-way valve element of claim 1, wherein the base layer and the top layer are joined by adhesive.
9. The one-way valve element of claim 8, wherein the adhesive is applied in parallel first and second strips extending along either side of the aperture, the channel provided between the adhesive strips.
10. A storage bag comprising:
a first flexible sidewall;
a second flexible sidewall overlaying and joined to the first flexible sidewall to provide an interior volume;
a one-way valve element attached to the first sidewall and communicating with the internal volume, the one-way valve element including a base layer having an aperture disposed therein, the one-way valve element further including a top layer joined to the base layer and covering the aperture, the top layer and base layer being joined so as to provide an expandable and collapsible channel between the aperture and an exit point on the valve element, the valve element further including a semi-rigid sealant material in the channel to normally seal between the top layer and base layer.
a first flexible sidewall;
a second flexible sidewall overlaying and joined to the first flexible sidewall to provide an interior volume;
a one-way valve element attached to the first sidewall and communicating with the internal volume, the one-way valve element including a base layer having an aperture disposed therein, the one-way valve element further including a top layer joined to the base layer and covering the aperture, the top layer and base layer being joined so as to provide an expandable and collapsible channel between the aperture and an exit point on the valve element, the valve element further including a semi-rigid sealant material in the channel to normally seal between the top layer and base layer.
11. The storage bag of claim 10, wherein the semi-rigid sealant material is a gel.
12. The one-way valve element of claim 11, wherein the gel is selected from the group consisting of a hydrocarbon gel, a gel adhesive, a petrolatum, and a jelly.
13. The one-way valve element of claim 10, wherein the semi-rigid sealant material has a hardness of between about 0 to about 70 points on the Shore 00 hardness scale.
14. The one-way valve element of claim 10, wherein the semi-rigid sealant material is a thermoplastic elastomer.
15. A method of evacuating a storage bag comprising:
providing a bag including an interior volume, an opening for accessing the interior volume, a one-way valve element communicating with the interior volume, the valve element having a base layer and a top layer being joined so as to provide an expandable and collapsible channel;
closing the opening;
exhausting air from the interior volume to the environment via the expanded channel;
collapsing the channel; and sealing the channel between the top layer and base layer with a semi-rigid sealant material.
providing a bag including an interior volume, an opening for accessing the interior volume, a one-way valve element communicating with the interior volume, the valve element having a base layer and a top layer being joined so as to provide an expandable and collapsible channel;
closing the opening;
exhausting air from the interior volume to the environment via the expanded channel;
collapsing the channel; and sealing the channel between the top layer and base layer with a semi-rigid sealant material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US72014305P | 2005-09-23 | 2005-09-23 | |
| US60/720,143 | 2005-09-23 | ||
| PCT/US2006/037034 WO2007038299A2 (en) | 2005-09-23 | 2006-09-22 | Valve element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2663092A1 true CA2663092A1 (en) | 2007-04-05 |
Family
ID=37900316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002663092A Abandoned CA2663092A1 (en) | 2005-09-23 | 2006-09-22 | Valve element |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU2006295424A1 (en) |
| CA (1) | CA2663092A1 (en) |
| WO (1) | WO2007038299A2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2196405A1 (en) * | 2008-12-10 | 2010-06-16 | Ling-Chu Su | Vacuum seal bag |
| DE102008054577A1 (en) * | 2008-12-12 | 2010-06-17 | Robert Bosch Gmbh | Pressure relief valve of a housing for an electrical / electronic unit |
| CN203294400U (en) * | 2013-04-27 | 2013-11-20 | 广东中兴塑料纸类印刷有限公司 | Packing device with air releasing valve |
| US9340324B2 (en) | 2013-09-11 | 2016-05-17 | Sunbeam Products, Inc. | Vacuum seal indicator for food preservation bags |
| CO2017005549A1 (en) * | 2017-06-02 | 2017-08-18 | Velez Juan Manuel Estrada | Valve for degassing with positive pressure control, manufacturing methods and packaging containing them |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT971505B (en) * | 1972-12-04 | 1974-05-10 | Goglio L | DEGASSING VALVE FOR FLEXIBLE COUNTERS WITH HERMIC CLOSURE AND CONTAINER FITTED WITH THE VALVE |
| DE3526586A1 (en) * | 1985-07-25 | 1987-02-05 | Bosch Gmbh Robert | PACKAGING CONTAINER WITH RBER PRESSURE VALVE |
| IT1248238B (en) * | 1991-06-18 | 1995-01-05 | Ica Spa | BREATHER VALVE. |
| US5228271A (en) * | 1992-05-28 | 1993-07-20 | Medivators, Inc. | Method and apparatus for compacting soft goods |
| US5584409A (en) * | 1995-09-18 | 1996-12-17 | Chemberlen; Christopher H. | One direction ventilation valves |
| US6090094A (en) * | 1996-10-04 | 2000-07-18 | Microgroup, Inc. | Ball valves and uses thereof including endoscopic surgical instruments |
-
2006
- 2006-09-22 CA CA002663092A patent/CA2663092A1/en not_active Abandoned
- 2006-09-22 WO PCT/US2006/037034 patent/WO2007038299A2/en active Application Filing
- 2006-09-22 AU AU2006295424A patent/AU2006295424A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU2006295424A1 (en) | 2007-04-05 |
| WO2007038299A3 (en) | 2009-04-23 |
| WO2007038299A2 (en) | 2007-04-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |