Temperature control pack and method
A temperature control pack for refrigerating a shipping container includes a mass of gel material which is shape-retaining at room temperature, and is configured as a relatively thick rectangular solid. The mass of gel material is enclosed in a first plastic film bag, and also in a second plastic film bag providing a sheath about the first bag, and also enclosing a quantity of air to provide an insulating and cushioning air space between the bags. Especially at the ends of the mass of gel material and surrounding bags, an air cushion space is provided in order to safeguard the plastic bags against bursting caused by “water hammer” effect from dropping, impacts, or jarring of the shipping container. The thick rectangular shape of the mass of gel material, along with the pair of plastic film bags, in combination with the insulating air space, provide a leak-resistant temperature control pack with increased refrigerating endurance.
1. Field of the Invention
The present invention relates generally to an improved temperature control pack, and particularly relates to such a pack which may be frozen and placed along with items requiring sub-ambient temperatures (i.e., refrigeration) into a shipping container. The frozen temperature control pack maintains the items at a refrigerated temperature during shipping, and preserves the items against high ambient temperatures.
2. Related Technology
The use of water ice, dry ice, and so-called gel-packs, or blue-ice packages in order to provide refrigeration for items during shipping has been known for a long time. However, each of these expedients has disadvantages. Water ice melts, and the resulting melt water presents a possibility of soaking into the items being shipped, or of leaking out of the shipping container.
Dry ice does not produce melt water, but it does provide temperatures which are too cold in many cases. The risk in the use of dry ice is that items shipped along with dry ice may be undesirably frozen. As a result, many shipments using dry ice refrigerant must include arrangements to insulate the dry ice from the items being shipped.
Similarly, the so-called “blue-ice packages present a leakage risk, and also may present a moisture hazard to items being shipped, as condensate forms on the blue-ice packages, and may contaminate the shipped items. Additionally, the blue-ice packages themselves present a soiling or spoiling risk, as these packages are subject to leakage and bursting due to the shipping container being dropped or subjected to impacts during shipping. The blue-ice containers generally contain a gel material which can leak out of the packages and soil, contaminate, or spoil items being shipped with the packages. Also, in order to prevent condensate water from contaminating or soiling the items being shipped, it is common for shippers to use a desiccant towel or wrapping about the gel pack to absorb and contain condensation.
SUMMARY OF THE INVENTIONIn view of the deficiencies of the conventional related technology, it is an object of this invention to overcome one or more of these deficiencies.
Particularly, an object for this invention is to provide a temperature control pack with improved endurance compared to an equivalent weight of conventional gel packs.
Another object for this invention is to provide a temperature control pack that is burst resistant.
To this end, the present invention provides a temperature control pack including a mass of gel material, a first bag enclosing this mass of temperature control material, and a second bag enclosing the first bag and a surrounding quantity of air to form an air space between the first bag and the second bag.
Further, the present invention provides a method of making the inventive temperature control pack.
Other objects, features, and advantages of the present invention will be apparent to those skilled in the art from a consideration of the following detailed description of a preferred exemplary embodiment thereof taken in conjunction with the associated figures which will first be described briefly.
While the present invention may be embodied in many different forms, disclosed herein is one specific exemplary embodiment which illustrates and explains the principles of the invention. In conjunction with the description of this embodiment, a method of making the product is described. It should be emphasized that the present invention is not limited to the specific embodiment illustrated. That is, those skilled in the relevant arts will further appreciate that the present invention may be embodied in other specific forms without departing from the spirit or central attributes thereof.
Turning now to
Considering now
Further, the mass 18 is seen in
Next,
Further to the above, it will be seen that the temperature control pack has several features which cooperatively reduce or eliminate bursting of the pack as a result of a shipping container being dropped or subjected to impact or jarring during shipping. It will be understood that such a dropping, impact, or jarring is more likely to cause a bursting of a gel pack late in a shipping transport, rather than early in the trip, because at a later time the gel will be more melted, and will be more fluid. However, the shape-retaining gel mass 18 is less fluid, and is less subject to the formation of a compression wave or surge in the material than is conventional refrigerating gel. That is, a “water hammer” effect is less likely to form in the mass 18 than is the case with conventional gel packs with their more fluid gel material. Of course, this “water hammer” risk is only a concern when the gel pack is melted or nearly melted. Such a surge or wave cannot form in the frozen gel material.
Secondly, the inner and outer bags 20 and 14 tend to reinforce one another so that the likelihood of breakage of either bag is reduced. This effect is assisted by the air space trapped between the bags 14 and 20 which also tends to form an “air pillow” or air cushion of trapped air which mitigates the effect of dropping, impact, or jarring on the gel pack 10. Especially, it is an important feature of the gel pack 10 that the end of mass 18 with seam 24 is piston-like within bag 14, while the opposite ends of bag 14 has a pocket or space (arrowed with the numeral 26 on
All of these factors combine to provide a temperature control pack which has greater refrigerating endurance, is less likely to form condensate water, is less likely to be burst or to leak as a result of dropping, impacts, or jarring of a shipping container, and also has the advantage that it is less likely to freeze of over cool items packed into a shipping container along with the pack 10.
Because the foregoing description of the present invention discloses only particularly preferred exemplary embodiments of the invention, it is to be understood that other variations are recognized as being within the scope of the present invention. Accordingly, the present invention is not limited to the particular embodiment which has been described in detail herein. Rather, reference should be made to the appended claims to define the scope and content of the present invention.
Claims
1. A temperature control pack comprising: a mass of gel material, a first bag enclosing said mass of gel material, and a second bag enclosing said first bag and a surrounding quantity of air to form an air space between said first bag and said second bag.
2. A temperature control pack according to claim 1 wherein said mass of gel material is shape-retaining and is configured at a rectangular solid, and said second bag defines in cooperation with said first bag a pair of opposite air cushion spaces each interposed between an end of said mass of gel material and an end of said second bag.
3. A temperature control pack according to claim 2 wherein said first bag is configured as a tube of plastic film material enclosing said mass of gel material, and said first bag defines a gusseted seam which is heat sealed and lays substantially flat against an end surface of said rectangular solid of shape-retaining gel material.
4. A temperature control pack according to claim 2 wherein said second bag is configured as a tube of plastic film material enclosing said second bag and said mass of gel material, and said second bad defines a transverse heat sealed seam that is spaced from an end of said mass of gel material and from said gusseted seam of said first bag, thus to cooperatively define one of said opposite pair of air cushion spaces.
5. A temperature control pack according to claim 1 wherein said mass of gel material is shape-retaining, and includes about 93 percent water, starch, and a polymer sufficient to render said mass of gel material shape-retaining.
6. A temperature control pack according to claim 1 wherein said mass of gel material has proportions of about 1:3:3.7.
7. A temperature control pack comprising: a mass of gel material which is shape-retaining at room temperature, a first bag sealingly enclosing said mass of gel material, and a second bag sealingly enclosing said first bag and said gel material.
8. A temperature control pack according to claim 7 wherein said second bag defines in cooperation with said first bag an interposed air space confining a quantity of air between said first bag and said second bag.
9. A temperature control pack according to claim 8 wherein said mass of gel material is shape-retaining at room temperature, and includes about 93 percent water, starch, and a polymer sufficient to render said mass of gel material shape-retaining.
10. A temperature control pack according to claim 7 wherein said mass of gel material has proportions of about 1:3:3.7.
11. A method of making a temperature control pack comprising steps of:
- providing a mass of gel material which is shape-retaining at room temperature,
- enclosing said mass of gel material sealingly in a first bag, and
- providing a second bag sealingly enclosing said first bag and said mass of gel material.
12. The method of claim 11 further including the steps of utilizing said second bag to sealingly enclose both said mass of gel material within said first bag, along with a surrounding quantity of air forming an air space between said first bag and said second bag.
13. The method of claim 11 further including the steps of providing for said mass of gel material to be shape-retaining at room temperature, and configuring said mass of gel material as a rectangular solid.
14. The method of claim 11 further including the steps of utilizing said second bag to define in cooperation with said first bag a pair of opposite air cushion spaces each interposed between an end of said mass of gel material and an end of said second bag.
15. The method of claim 11 further including the steps of configuring said first bag as a tube of plastic film material enclosing said mass of gel material, and said first bag defines a gusseted seam which is heat sealed and lays substantially flat against an end surface of said rectangular solid of shape-retaining gel material.
16. The method of claim 15 further including the steps of configuring said second bag as a tube of plastic film material enclosing said first bag and said mass of gel material, and configuring said second bad to define a pair of transverse heat sealed seams that are each spaced from a respective end of said mass of gel material and from said gusseted seams of said first bag, thus to cooperatively define said opposite pair of air cushion spaces.
17. A temperature control pack made according to the method of claim 11.
18. A temperature control pack made according to the method of claim 16.
19. A temperature control pack comprising:
- a mass of gel material which is generally of rectangular solid shape, and is shape-retaining at room temperature, said mass of gel material including water, a starch, and a polymer sufficient to render said gel material shape-retaining at room temperature;
- a first bag of plastic film material enclosing said mass of gel material, said first bag being configured as a tube of plastic film receiving said rectangular mass of gel material, and defining a pair of opposite gusseted heat-sealed seams each laying substantially flat against a respective end surface of said rectangular mass of gel material;
- a second bag enclosing said first bag and a surrounding quantity of air to form an air space between said first bag and said second bag, said second bag also being configured as a tube of plastic film material receiving said first bag and said mass of gel material, and said second bag defining an opposite pair of transverse heat-sealed seams each being spaced from a respective end of said mass of gel material and cooperatively defining a respective air cushion space at a respective end of said temperature control pack.
20. A temperature control pack according to claim 19 wherein said mass of gel material includes about 93 percent water, starch, and polymer sufficient to render said mass of gel material shape-retaining at room temperature.
21. A method of using a temperature control pack, said method comprising steps of:
- providing said temperature control pack with a mass of gel material which is generally of rectangular solid shape, and providing for said mass of gel material to be shape-retaining at room temperature, providing for said mass of gel material to include water, a starch, and a polymer sufficient to render said gel material shape-retaining at room temperature;
- enclosing said mass of gel material in a first bag of plastic film material, configuring said first bag as a tube of plastic film receiving said rectangular mass of gel material, and defining a pair of opposite gusseted heat-sealed seams in said tube of plastic film so that each seam lays substantially flat against a respective end surface of said rectangular mass of gel material;
- providing a second bag of plastic film enclosing said first bag, said mass of gel material, and also a surrounding quantity of air to form an air space between said first bag and said second bag, configuring said second bag also as a tube of plastic film material, and utilizing said second bag to define an opposite pair of transverse heat-sealed seams each being spaced from a respective end of said mass of gel material and cooperatively defining a respective air cushion space at a respective end of said temperature control pack;
- freezing said temperature control pack and packaging the frozen temperature control pack inside of an insulated container along with items to be shipped; and
- utilizing an increased R value provided by said first and second bags in combination with said air space and effective between said mass of gel material and the surroundings of said temperature control pack within the container to both mitigate condensation of water on said temperature control pack, and to increase the refrigerating endurance of said temperature control pack.
22. The method of claim 20 further including the step of providing for said mass of gel material to includes about 93 percent water, starch, and polymer sufficient to render said mass of gel material shape-retaining at room temperature.
23. A temperature control pack comprising: a mass of gel material, a first bag enclosing said mass of gel material, and a second bag enclosing said first bag, and wherein said mass of gel material has proportions of about 1 unit in thickness: to about 3 units in width: to about 3.7 units in length
24. The temperature control pack according to claim 23 wherein said mass of gel material includes about 93 percent water, starch, and polymer sufficient to render said mass of gel material shape-retaining at room temperature.
Type: Application
Filed: Aug 11, 2006
Publication Date: Feb 14, 2008
Inventor: Larry William French (San Clemente, CA)
Application Number: 11/503,467
International Classification: F25D 3/08 (20060101);