Plastic bags are used for a variety of purposes including storing food items. Such bags can be made from a thermoplastic sidewall material arranged to provide an interior volume that can receive items for storage via an opening disposed into the sidewall. Often these bags have interlocking closure strips on the rim of the opening of the bag so that it may be sealed once an item has been placed in the bag. These types of bags may also be heat-sealed or glued at the rim of the bag to provide a more permanent closure. Such plastic bags are often made from flexible thermoplastic sheet material so that they can accommodate a variety of shapes and sizes of objects.
A common problem with these types of bags is that once the opening has been closed, latent air may remain trapped in the interior volume of the bag. This causes many problems. First, the latent air trapped in the bag can increase the overall size of the bag which is undesirable and causes difficulties in storing the bag. Additionally, this trapped latent air causes many problems when the item stored in the bag is a food item. The trapped air can cause the stored food items to spoil or dehydrate. When the bag is stored in a freezer, the trapped air can also contribute to freezer burn of the stored food items.
In various aspects, the invention provides a vacuum storage bag with a flexible plastic sidewall configured to provide an interior volume for receiving storage items. To access the interior volume, a resealable opening can be disposed through the sidewall. To remove latent air that is trapped in the interior volume once the opening has been sealed, a valve element can be attached to the sidewall so as to communicate with the interior volume. The valve element allows latent air to be evacuated from the bag once the opening has been sealed. To improve the functionality and the packability of the storage bag, the valve element can be a low profile or compactly sized valve element.
Such a valve element can have various characteristics associated with it. One characteristic of such a valve element is that the valve element can have a low profile wherein the ratio of the height of the valve to the gauge thickness of the sidewall of the bag can be small. A low profile valve element may also be characterized as having a low ratio of height as compared to the surface area of the bag sidewall. The valve element may also be compactly sized wherein the ratio of the maximum width of a sidewall to the maximum width of the valve element is large. Another characteristic of a compact sized valve element is that it may have a high ratio of surface area of the sidewall of the bag to the surface area of the aperture in the bag. Another characteristic of the valve element is that the flexibility of the sidewall of the plastic bag is similar to the flexibility of the valve element. The valve element may also be constructed using a single-ply construction or a multi-ply construction. There are, additionally, other characteristics of a valve element which are discussed and claimed herein.
A benefit of this storage bag is that the advantages offered by a flexible plastic bag are not impaired by a large or inflexible valve element. An additional advantage of these types of bags is that the bags are easier to pack and store. This may lead to reduced cost associated with the manufacturing of these vacuum storage bags. These and other features and advantages of the invention will be apparent from the foregoing drawings and detailed description of the embodiments.
Now referring to the drawings, wherein like reference numbers refer to like elements, there is shown in
The first and second sidewalls can be made from any suitable material such as, for example, high density polyethylene, low density polyethylene, polypropylene, ethylene vinyl acetate, nylon, polyester, and polyamides. The flexible and pliable nature of the thermoplastic material enables the bag to be folded and packaged in a cardboard box with a number of like bags for commercial distribution.
To access the interior volume 106, the top edges 120, 122 of the first and second sidewalls 102, 104 remain unjoined to provide 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 some embodiments, the bag 100 can include a movable slider straddling the fastening strips 126, 128 to facilitate sealing and unsealing of the opening 124. In other embodiments, the bag can include additional or different suitable closure mechanisms for sealing closed the opening.
To evacuate the storage bag 100 of latent or entrapped air after the opening has been closed a one-way valve element 130 is included at an exposed location on the bag. The valve element 130 can be attached to the first flexible sidewall 102 and can communicate with the interior volume 106. The valve element 130 could also be attached to the second sidewall 104.
The one-way valve element 130 can be configured to open under an applied pressure differential thereby allowing air from the interior volume to escape and to close after elimination or reduction of the pressure differential. To establish the pressure differential, a vacuum device can be used. For example, as illustrated in
Referring to
To secure the top layer 144 to the base layer 142, in the embodiment illustrated in
Referring to
In accordance with one aspect of the invention, the valve element 130 can be configured as a low profile valve element. A characteristic of such a valve element is that it has a relatively low or small height dimension 182 as measured from the sidewall surface. The ratio of the valve height 182 to the thickness 184 can be in a first range between about 1:1 to about 20:1, in a second range between about 4:1 to about 10:1, and in a third range between about 4:1 to about 6:1. In one embodiment, the ratio of the valve height 182 to the thickness 184 can be about 4.4:1. With the valve element having a height or thickness comparable to the bag sidewall thickness, the valve element can be sufficiently flexible to enable folding of the bag.
A low-profile valve element can have other characteristics. The bag sidewall 102 can have a sidewall width 190, a sidewall height 192 and a sidewall surface area 183. The sidewall width 190 may be in a first range between about 3 inches (7.620 cm) to about 15 inches (38.1 cm), in a second range between about 5 inches (12.70 cm) to about 12 inches (30.48 cm), and in a third range between about 7 inches (17.78 cm) to about 12 inches (30.48 cm). The sidewall height 192 may be in a first range between about 3 inches (7.62 cm) to about 20 inches (50.8 cm), in a second range between about 5 inches (12.7 cm) to about 15 inches (38.10 cm), and in a third range between about 9 inches (22.86 cm) to about 12 inches (30.48 cm). The surface area 183 may be in a first range between about 0.25 inches2 (1.613 cm2) to about 1 inches2 (6.452 cm2) and in a second range between about 0.30 inches2 (4.916 cm2) to about 0.50 inches2 (8.194 cm2). For example, the bag sidewall 102 can have a width 190 of about 11 inches (27.940 cm) and a height 192 of about 12 inches (30.480 cm) and thus a surface area of about 132 square inches (851.611 sq. cm). The ratio of the area 183 of the first sidewall to the height 182 of the low-profile valve can be in a first range between about 1800:1 to about 30,000:1, in a second range between about 2500:1 to about 15,000:1, and in a third range between about 5000:1 to about 12,000:1. In one embodiment, the ratio of the area 183 of the first sidewall to the height 182 of the low-profile valve 130 can be about 9429:1. As another characteristic, the ratio of the surface area 181 of the low-profile valve element 130 to the height 182 of the low-profile valve element can be in a first range between about 40:1 to about 350:1, in a second range between about 40:1 to about 70:1, and in a third range between about 40:1 to about 60:1. In one embodiment, the ratio of the surface area 181 of the low-profile valve element 130 to the height 182 of the low-profile valve element can be about 43:1.
In another aspect, the characteristics of the valve element 130 can be assessed in comparison to the hole 156 disposed through the sidewall 102. The hole 156 may have a hole width 186 in a first range between about 0.094 inches (0.239 cm) to about 0.500 inches (1.270 cm), in a second range between about 0.125 inches (0.318 cm) to about 0.406 inches (1.031 cm), and in a third range between about 0.156 inches (0.396 cm) to about 0.344 inches (0.874 cm). In one embodiment, the hole width 186 may be about 0.1875 inches (0.476 cm). Another characteristic of the valve element 130 is that the ratio of the hole width 186 of the hole 156 to the valve element height 182 can be in a first range between about 10:1 to about 70:1 and in a second range between about 15:1 to about 20:1. In one embodiment, the ratio of the hole width 186 of the hole 156 to the valve element height 182 can be about 17.9:1.
As another characteristic, the ratio of the valve element height 182 to the width 180 of the valve element 130 can be in a first range between about 0.01:1 to about 0.035:1, and in a second range between about 0.016:1 to about 0.024:1. In one embodiment, the ratio of the valve element height 182 to the width 180 of the valve element 130 can be about 0.018:1.
In another aspect of the invention, the valve element can be compactly sized. For example, the ratio of the width 186 of the hole 156 to the width 180 of the valve element 130 can be in a first range between about 0.010:1 to about 0.035:1, in a second range between about 0.025:1 to about 0.50:1, and in a third range between about 0.15:1 to about 0.35:1. In one embodiment, the ratio of the width 186 of the hole 156 to the width 180 of the valve element 130 can be about 0.24:1. The area 187 of the hole 156 may be in a first range of about 0.007 inches2 (0.045 cm2) to about 0.200 inches2 (1.29 cm2), in a second range between about 0.012 inches2 (0.077 cm2) to about 0.120 inches2 (0.774 cm2), and in a third range between about 0.02 inches2 (0.129 cm2) to about 0.10 inches2 (0.645 cm2). In one embodiment, the hole area 187 may be about 0.028 inches2 (0.181 cm2). As another characteristic, the ratio of the surface area 183 of a sidewall to the area 187 of the hole 156 in the sidewall can be in a first range between about 1000:1 to about 21,000:1, in a second range between about 1500:1 to about 10,000:1, and in a third range between about 3,000:1 to about 7,000:1. In one embodiment, the ratio of the surface area 183 of the sidewall 102 to the area 187 of the hole 156 disposed in the sidewall can be about 4780:1.
As another characteristic, the ratio of the surface area 183 of the sidewall 102 to the surface area 181 of the valve element 130 can be in a first range between about 40:1 to about 750:1, in a second range between about 100:1 to about 300:1, and in a third range between about 150:1 to about 250:1. In one embodiment, the ratio of the surface area 183 of the sidewall to the surface area 181 of the valve element 130 can be about 216.2:1.
Referring to
In other embodiments, the aperture in the base layer may be the same size as the hole in the sidewall. Referring to
In other embodiments, the aperture in the base layer may be misaligned with the hole in the sidewall. Referring to
The low profile or compactly sized valve element of the foregoing type can offer various advantages. For example, the valve element is sized sufficiently small so as to not interfere with packaging and use of the bag. Another advantage is that the sidewall hole through which the valve element communicates with the interior volume can be relatively small, which in turn helps maintain the strength and integrity of the sidewall. Another advantage is that, because of its low height and flexible thermoplastic material, the valve element mimics the flexibility of the bag sidewall material. Hence, the bag can be easily folded or conform around an item located in the interior volume.
Referring to
To secure the valve element 530 to the sidewall 502, in the embodiment illustrated in
The single ply valve element 530 illustrated in
Illustrated in
To secure the single layer 644 to the sidewall 602, in the embodiment illustrated in
The single layer valve element 630 illustrated in
The valve element 730 can have any of the aforementioned characteristics and ratios, including various combinations of those characteristics and ratios. In one embodiment, the valve may have a surface area of 0.425 inches2 (2.742 cm2). Hence, the valve element can be a low profile or compactly sized valve element.
The valve element 830 can have any of the aforementioned characteristics and ratios, including various combinations of those characteristics and ratios. In one embodiment, the valve may have a surface area of 0.425 inches2 (2.742 cm2). Hence, the valve element can be a low profile or compactly sized valve element.
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.
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.
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 permitted 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.
This patent application is a continuation-in-part of copending U.S. patent application Ser. No. 10/880,784, filed Jun. 29, 2004 which is incorporated by reference in its entirety.
Number | Date | Country | |
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Parent | 10880784 | Jun 2004 | US |
Child | 11838601 | Aug 2007 | US |