Insulated shipping bags

Abstract

A collapsible insulated bag designed to allow items retained within an inner pouch thereof to remain within predetermined temperature ranges for predetermined periods of time and wherein the bags are designed to be easily compressed or compacted for storage or shipment to end users. The bags include at least an outer reflective or paper/Kraft based film layer, an intermediate open foam or insulating batt layer, and the inner pouch layer.

Claims

1. An insulated shipping and/or storage bag having a bottom, walls, and an opening generally opposite the bottom, wherein the bag is configurable between a bag configuration and a free standing configuration capable of maintaining a supporting shape when placed on a surface, the bag comprising: an outer layer; an intermediate layer, said intermediate layer being made from an insulating batt of single sheet of material having a generally rectangular shape with cut outs at each of four corners thereof and opposing cut outs generally centrally along opposite side edges of said sheet of material so as to form a middle portion between two side portions each having an end portion on an end opposite said middle portion, said cut outs enabling a free standing configuration whereby said intermediate layer is folded centrally thereof so that said middle portion becomes the bottom, said side portions become the walls, and said end portions cover the opening of the bag and whereby said intermediate layer continuously extends along the bottom and walls and covers the opening of the free-standing configuration of the bag without overlap of said intermediate layer; and an inner layer that is configured to form an article receiving pouch, said inner layer including a cuff in which said end portions of said intermediate layer are received to thereby secure said intermediate layer to said inner layer and to create a seal separating said intermediate layer from the interior of the bag, wherein in the free standing configuration of the bag, said cuff extends over said end portions and along at least a portion of an outer surface of said intermediate layer.

2. The insulated shipping and/or storage bag of claim 1 wherein the inner layer is made of paper.

3. The insulated shipping and/or storage bag of claim 1 wherein the inner layer is made of Kraft based film.

4. The insulated shipping and/or storage bag of claim 1 wherein the insulating batt of the intermediate layer is comprised of a combination of natural fibers.

5. The insulated shipping and/or storage bag of claim 1 wherein the insulating batt of the intermediate layer includes a lofting fiber including one or more of polypropylene, polyester, jute, kenaf, flax, hemp, wool, and cotton.

6. The insulated shipping and/or storage bag of claim 1 wherein the insulating batt of the intermediate layer includes: a. a lofting fiber including one or more of polypropylene, polyester, jute, kenaf, flax, hemp, and cotton; and b. a bi-component binder fiber with low-melt sheath and core, the binder fiber is selected from polylactic acid (PLA), an activated copolyolefin sheath and a polyester core, a copolyester sheath and a polyester core, a crimped fiber with a copolyester sheath and a polyester core.

7. The insulated shipping and/or storage bag of claim 1 further comprising venting means to vent air from between said inner layer and said outer layer to permit the shipping and/or storage bag to be compactly configured for shipment to an end user without allowing air to enter the interior of the bag.

8. The insulated shipping and/or storage bag of claim 7 further comprising covering means for covering said venting means.

9. The insulated shipping and/or storage bag of claim 1 wherein said intermediate layer is between approximately one half inch to one and one half inches in thickness.

10. The insulated shipping and/or storage bag of claim 1 wherein said sheet of material further includes slits extending inwardly from each of said cut outs.

11. The insulated shipping and/or storage bag of claim 1 further comprising sealing means for sealing the opening into the bag.

12. The insulated shipping and/or storage bag of claim 11, wherein said sealing means includes a handle.

13. The insulated shipping and/or storage bag of claim 1, wherein said outer layer is made of paper.

14. The insulated shipping and/or storage bag of claim 1, wherein said outer layer is made of Kraft based film.

15. The insulated shipping and/or storage bag of claim 1, wherein a portion of said cuff extending along at least a portion of an outer surface of said intermediate material layer is secured to an inner surface of said outer layer of the bag.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) A better understanding of the invention will be had with reference to the accompanying drawings wherein:

(2) FIG. 1 is a top front perspective view of one embodiment of the present invention shown in an open position to receive an article or item therein;

(3) FIG. 2 is a cross section taken along line 2-2 of FIG. 1 showing the insulation layers of the thermal insulated shipping and storage bag;

(4) FIG. 2a is the cross section view of FIG. 2 showing the insulated shipping and storage bag in a free standing configuration;

(5) FIG. 3 is a top front perspective view of the embodiment of the invention shown in FIG. 1 with an article placed therein and showing how the insulated shipping and storage bag is self-standing on a support surface;

(6) FIG. 4 is a top plan view of the intermediate foam or insulating batt layer showing cut outs with slits therein to facilitate the free standing nature of the insulated bag when is use.

(7) FIG. 4a is the top plan view of FIG. 4 showing the intermediate foam or insulating batt layer in a folded configuration to enable the free standing nature of the insulated bag;

(8) FIG. 5 is a perspective view of the inner plastic or paper/Kraft based film layer of FIG. 1 formed into a pouch-like structure and showing a cuff thereof frictionally engaging the upper ends of the intermediate foam insulating material or insulating batt material therein;

(9) FIG. 6 is a view similar to FIG. 1 showing one of the insulated bags of the invention with an opening and related closure for use in evacuating and subsequently inflating the bag to permit compact storage and shipment to an end user;

(10) FIG. 7 is a cross section taken along line 7-7 of FIG. 6 showing a tube placed through the opening for reducing the pressure within bag and the open cell foam or insulating batt material therein;

(11) FIG. 8 is a perspective view of a plurality of insulated bags in accordance with the invention being placed within an outer plastic sealable enclosure for shipment to an end user while compactly retained or folded under internal reduced pressure;

(12) FIG. 9 is a cross sectional view similar to FIG. 2 showing an alternate embodiment of the invention; and

(13) FIG. 9A is the cross section view of FIG. 9 showing the alternate embodiment of the insulated shipping and storage bag in a free standing configuration.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(14) With continued reference to the drawings, the invention will be described with respect to several embodiments for insulated and flexible or pliable hot/cold storage and shipping bags. A first embodiment of insulated bag 10 in accordance with the invention is shown in FIGS. 1-4. The insulated bag 10 is a multi-layer structure for storing and shipping temperature sensitive items that is made of at least three layers of thermal insulating materials. In a first embodiment, an outer layer 11 is made of materials known for reflecting radiant heat, are tear resistant, non-porous, leak proof, that can be heat sealed or otherwise welded or sealed with a sterile poly pouch material and that is compatible with conventional printing techniques. Such materials include, but are not limited to, thermoplastic polymers, such as metallic polyethylene terephthalate (METPET), and various metallic foils. As noted, the outer layer 11 can be printed with advertising information or any other indicia as desired.

(15) Alternatively, the outer layer 11 is formed of a paper or Kraft based film which may be treated with a LDPE or like sealant with self-adhesive properties on one or both sides. The outer layer 11 can be printed, heat sealed, or glued.

(16) The outer layer 11 is formed of the above identified materials and is generally rectangular in shape when laid out in a one piece film. The outer layer 11 is preformed into a pouch or bag shape by folding the one piece film along a midline thereof to create a bottom portion 12 with the side edges thereof being welded, heat sealed or otherwise sealed to form opposite side seams 13 thereby creating an opening 14 into the outer layer.

(17) In the first embodiment, an intermediate insulating layer 20, see FIG. 2, is constructed of materials known for having low thermal transfers. Such materials include but are not limited to low density collapsible open cell polyurethane foams, including those foams that exhibit memory to reshape themselves after being deformed. Thus, the insulating layer is made of a collapsible or compressible, memory foam with thermal and cushioning properties. The foam can be die-cast (molded) or cut and shaped to prevent any thermal bridges.

(18) Alternatively, the intermediate insulating layer 20 is made of insulating batt of up to 3 lbs/cubic foot and recovers at least 80 percent of its precompression volume upon decompression. The intermediate insulating layer 20 comprises a fiber structure made of any combination of natural fibers consisting essentially of:

(19) a. a lofting fiber comprising one or more of polypropylene, polyester, jute, kenaf, flax, hemp, wool, and cotton;

(20) b. a bi-component binder fiber with low-melt sheath and core. The binder fiber can be made of polylactic acid (PLA), an activated copolyolefin sheath and a polyester core, a copolyester sheath and a polyester core, a crimped fiber with a copolyester sheath and a polyester core; or

(21) c. a combination of (a) and (b).

(22) Thermal bridges are created when poorly insulated materials are used and allow heat transfer to occur through the material. To prevent thermal bridges, the insulated foam or insulating batt materials must be properly designed and placed to properly insulate the area of concern in which an item to be contained within the insulated bag is to be received. In view of this, in the first embodiment the insulating foam layer 20 is made from a polyurethane or polyurethane-like foam to prevent thermal bridges and to effectively maintain the low thermal transfer needed to assure that any perishable product is maintained at optimal temperatures. In addition to the low thermal properties of the foam, the foam is able to conform to any item enclosed and to thereby become the frame and/or structure of the item. The self-forming foam creates a base or floor, lid and walls for a product when the product is placed therein. The foam also provides a protective cushion for any articles placed within the bags and thus protects against article damage.

(23) In the alternative embodiment, the insulating batt layer 20 is made from a lofting fiber alone or combined with a bi-component binder fiber with low-melt sheath and core to prevent thermal bridges and to effectively maintain the low thermal transfer needed to assure that any perishable product is maintained at optimal temperatures. In addition to the low thermal properties of the insulating batt, the insulating batt is able to conform to any item enclosed and to thereby become the frame and/or structure of the item. The self-forming insulating batt creates a base or floor, lid and walls for a product when the product is placed therein. The insulating batt also provides a protective cushion for any articles placed within the bags and thus protects against article damage.

(24) With reference to FIG. 4, the foam insulating or insulating batt layer 20 may be between approximately one half inch to one and one half inches in thickness and may be of varying densities. The foam or insulating batt layer is in the form of a sheet that is generally rectangular in shape with two ends 21 and 22 being substantially parallel to each other and two long sides 23 and 24 being substantially parallel to each other. The insulating layer has, in each corner, generally rectangular cutout regions 25. Each cutout is defined by two intersecting wall portions 26 and 27 that intersect generally perpendicularly with one another. The cutout regions 25 may include an additional slit 25 extending into the width of the material to facilitate bending. The size of the cut outs 25 may vary depending upon the size of the insulated bag with the function of the cut outs to permit the top of the completed bag to fold at the corners thereof when the layer 20 is folded centrally thereof at A-A to create opposing side walls 28 and 29, see FIG. 5. In addition to the corner cut outs, opposing cut outs 30 are provided centrally of the sides of the intermediate foam or insulating batt layer. The cut outs 30 are rectilinear and their size may also vary, it being the function of these cut outs to facilitate the folding of the bottom 12 of a complete insulated bag to form a generally flat support base for the bag when an item is placed therein and the bag is placed on a support surface S, as is shown in FIG. 3. As with the other cutout regions 25 the cutout regions 30 may include additional slits 30 extending into the width of the material to facilitate bending.

(25) In the first embodiment, the insulated bag 10 also includes an innermost plastic layer 32 that is made of one or more materials known for lower thermal convection. Such materials include polyurethanes, polypropylenes, elastomeric compounds and like materials that are leak-proof, non-porous and food grade and that can be heat sealed or otherwise secured or welded to the outer reflective layer 11.

(26) Alternatively, the insulated bag 10 includes an innermost layer 32 that is made of a paper or Kraft based film which may be treated with LDPE or a similar sealant with self-adhesive properties on one or both sides. The inner layer 32 can be printed, heat sealed, or glued.

(27) In the preferred embodiment of the invention shown in FIG. 1, the inner plastic or paper/Kraft based film layer 32 is formed as a bag or pouch that is only open at a top opening 34 thereof, as is shown in FIG. 2. The pouch is provided with an annular outwardly folded cuff 35 at the opening therein such that the cuff is of a size to frictionally receive and retain upper free end portions 36 and 37 of the opposing side walls 28 and 29 of the intermediate insulated foam or insulating batt. In this manner, the intermediate insulation material is mechanically secured to the inner plastic or paper/Kraft based film layer 32 such that both layers may be simultaneously inserted within the outer reflective or metallic foil, or paper/Kraft based film, layer. This frictional retention of the intermediate layer within the cuff of the inner plastic or paper/Kraft based film layer 32 will also function to retain the intermediate insulating layer in place within the outer layer when the composite insulating bags of the invention are in use and will also substantially seal the inner volume 40 of the insulated bag 10 from the volume or area 38 between the inner layer 32 and the outer layer 11 to thereby prevent contamination of the inner volume 40. In some instances an adhesive or other agent may be used to completely or hermetically seal the upper portions 36 and 37 of the intermediate foam material or insulated batt within the cuff 35 of the inner layer 32.

(28) In some embodiments and as shown in FIG. 2, the upper end of the inner plastic or paper/Kraft based film pouch layer 32 is welded at 41 to the inner surface 42 of the outer layer, at or spaced slightly below the upper edges of the outer layer to hermetically enclose the insulated bag 10 between the inner layer 32 and the outer layer 11.

(29) Although not shown in the drawings, in some embodiments, the inner plastic or paper/Kraft based film pouch-like structures of the inner layers 32 may be heat sealed at their upper open ends 44 after articles or items are placed with the insulated bags 10. In other embodiments, mechanical zip-like closures or double sided tapes may be used to seal the upper ends 44 of the inner plastic or paper/Kraft based film bags after articles or items are placed therein. In yet other embodiments, the inner plastic or paper/Kraft based film bags may not be sealed at the opening 34.

(30) Preferably, the upper ends of the outer reflective or foil, or paper/Kraft based film, bag-like layers 11 are provided with either heat seals or mechanical zip-like locks or friction lock seals. In some embodiments, the seals may be created using friction lock members 50 and 51 that are initially sealed at 52 to the upper edges of the opposing sides of the outer foil or reflective layers. Friction lock member 50 includes a handle 53 that is insertable through an opening 55 in the lock member 51. Lock member 51 is generally u-shaped in cross section, see FIG. 2, with a width of the cross section being such that lock member 50 is frictionally seated therein to seal the members together when the handle 53 is inserted through the opening 55 to thereby seal the bag 10, see FIG. 3.

(31) The insulated bag 10 can be closed using other known conventional methods such as pressure closures, taping closures, flaps with re-sealable taping means, flaps with peel-off taping means, plastic zip-lock fasteners and the like.

(32) Although not shown in the drawing figures, in some embodiments one or more addition foam or insulating batt layers may be inserted between the inner pouch or layer 32 and the outer layer 11 to increase the insulating properties of the insulated bags to increase the length of time products will remain at optimal temperatures.

(33) As previously described, one of the advantages of the present invention is that the insulated bags may be compactly arranged and retained either for storage or shipment to wholesalers or end users to thereby reduce shipping package volumes and thus reducing costs associated with shipping and storage of the bags. With reference to FIG. 8, an embodiment for reducing the volume of a package of the insulated bags 10 of the invention is shown in detail. As shown, one or more insulated bags 10 may be placed within an outer plastic bag 60 have one end with a sealable opening 62. Thereafter, the outer bag is mechanically collapsed, as reflected by the arrow 65, to force most air out of the enclosed insulated shipping bags 10 and the outer bag 60. Thereafter, the outer bag is sealed. In some embodiments, a partial vacuum may be applied within the outer bag to reduce the pressure therein and to reduce the volume of the overall package and the outer bag 60 subsequently sealed.

(34) In another embodiment of the invention and with reference to FIGS. 6 and 7, to facilitate the compact handling and/or folding of the multi-layered insulated shipping and storage bags of the invention for storage or shipment to wholesalers or end users for subsequent use, the interior of the bags 10, and especially the intermediate open cell foam or insulating batt layers 20 are designed to be evacuated by the application of a partial vacuum. Such a vacuum may be applied to the bags through openings 70 between the outer reflective or paper/Kraft based film layer 11 and the intermediate open cell foam or insulating batt material 20 thereof by use of a vacuum tube 72 or by placing the bags 10 within an enclosure under a reduced atmosphere. When the vacuum tube is withdrawn, or the predetermined reduced pressure is obtained within the bags, the outer openings 70 therein are closed by removable adhesive patches or covers 74 to prevent ambient air from entering the bags. The covers or patches include a self stick adhesive 75 on the inner face thereof for use in sealing the openings to prevent inadvertent inflation of the spaces within the bags. When the bags have been at least partially evacuated so that air is removed from the open cell foam or insulated batt and from between the outer reflective or paper/Kraft based film layer and the inner plastic or paper/Kraft based film layer or pouch 32, they are easily stacked or folded into compact configurations for storage or for shipment. When the bags are to be used by an end user, the patches or covers are removed and the bags will automatically expand as ambient air enters the vacuum openings therein. After the bags are inflated, the adhesive patches or covers may be reapplied to prevent contaminants from entering the openings therein. In this regard, when the insulated shipping and storage bags 10 are to be used to ship or store items that must remain sterile, the vacuum processes and inflating processes may take place within sterile enclosures.

(35) With reference to FIG. 9, another embodiment or insulated bag 10 of the invention is disclosed wherein the cuff of the inner layer or pouch 32 associated with the embodiment shown in FIGS. 1 and 2 is not used. In this embodiment, the inner layer or pouch 32 includes an upper free edge 76 that is directly sealed or welded at 78 to the inner surface of the outer or paper/Kraft based film reflective layer 11 below the opening into the bag 10. The bag of this embodiment may be used with the vacuum opening and seals associated therewith as previously described and the materials and the manner of compact shipment or storage including the use of an outer packaging container or pouch may also be the same.