PACK FOR HEATING AND COOLING
A thermal pack holding a pair of mixable components, one of which is flowable, to produce a desired exothermic or endothermic reaction is disclosed. The pack is formed of a flexible sheet having two compartments, one for each of the components, separated by a frangible barrier arranged to be broken to enable the components to mix. In one embodiment the pack includes a pair of pull tabs to enable the user to break the frangible barrier. In another embodiment the pack is folded, with the compartments juxtaposed with respect to each other, whereupon the application of pressure to the pack causes the flowable material to apply pressure to the frangible barrier to cause it to rupture.
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This invention relates to heating or cooling packs and more particularly to thermal packs for holding separate ingredients, which when mixed produce either an exothermic or endothermic reaction.
Heating or cooling packs are known for use in a variety of applications including therapy for muscular injury or circulatory problems or heating or cooling food. Such packs typically hold two reactants in separate compartments in the pack until ready for use, at which time a barrier or some other structure separating the compartments is broken or ruptured so that the reactants can be mixed together to produce an endothermic or exothermic reaction. Examples of such thermal packs are disclosed in the following U.S. Pat. Nos.: 3,913,559; 5,611,329; 5,967,308; 6,289,887; and 6,827,080 and in the following published patent applications: US2006/0191272 and US2006/0135016.
While the thermal packs of the prior art are generally suitable for their intended purposes, they nevertheless leave something to be desired from the standpoint of ease of use and effectiveness of operation. In particular, a need exists for a thermal pack that is constructed to facilitate the opening of the compartments holding the reaction-inducing components to effectively intermix those components and thereby produce an even heating or cooling effect across the pack. The subject invention addresses that need.
SUMMARY OF THE INVENTIONOne aspect of this invention is a thermal pack holding a pair of mixable components, one of which is flowable. The pair of mixable components is arranged when mixed to produce either an exothermic or endothermic reaction for heating or cooling, respectively. The thermal pack is formed of a flexible sheet material having a first panel, a second panel, and a pair of pull tabs. One of the pull tabs is connected to the first panel and the other of the pair of pull tabs is connected to the second panel. The first panel is secured to the second panel to form a first compartment and a second compartment located between the panels. The first compartment is isolated from the second compartment by a frangible barrier located between the panels. The first compartment is arranged for holding a first one of the pair of mixable components. The second compartment the arranged for holding a second one of the pair of mixable components. The pair of pull tabs is coupled to the frangible barrier and is arranged to be grasped and pulled apart to break the frangible barrier, whereupon the mixable components can be mixed together to produce the desired exothermic or endotheimic reaction.
Another aspect of this invention is a thermal pack for holding a pair of mixable components like described above. The thermal package of this aspect of the invention is formed of a flexible sheet material having a first panel and a second panel. The first panel is secured to said second panel to form a first compartment and a second compartment. The first compartment is isolated from the second compartment by a frangible barrier located between the panels. The first compartment is arranged for holding a first one of said pair of mixable components. The second compartment is arranged for holding a second one of the pair of mixable components. The second one of the pair of mixable components is flowable, e.g., is a liquid. The thermal pack is folded so that the first and second compartments are disposed overlying each other, whereupon the application of pressure to either the first or second compartment causes the second one of the mixable components to apply pressure to the frangible barrier to cause the frangible barrier to rupture, whereupon the second one of the mixable components engages and mixes with the first one of the mixable components to produce the desired exothermic or endothermic reaction.
Referring now to the various figures of the drawing wherein like reference characters refer to like parts, there is shown at 20 in
The exemplary embodiment of the thermal pack 20 shown in
Any type of flexible sheet material can be used to fabricate the thermal packs of this invention, be it a sheet material of a single layer or of multiple layers. For example, one particularly effective sheet material for the thermal packs of this invention is a lamination consisting of a polyethylene film inside layer forming the surfaces 26A and 28A. The outside surface of the lamination is 48 gauge polyester film (not shown). A layer of aluminum foil (not shown) is interposed between the inside and outside layers.
As mentioned earlier the thermal pack 20 includes a frangible barrier for isolating the two compartments 22 and 24. That barrier is best seen in
The pull tab 30 basically comprises the portion of the pack contiguous with the seal line 34 and is composed of the contiguous and abutting portions of the panel 26. The pull tab 32 comprises an internally folded portion of the panel 28 located at the interface of the compartments 22 and 24. When the pack is in its normally stowed or folded condition, like shown in
By manipulating the pack as will be described in detail later, the user of the pack can grasp the two pull tabs 30 and 32 to pull them apart, which will break, i.e., peel open, the frangible barrier, thereby providing a communicating passageway between the two compartments through which the flowable component can flow to engage and mix with the other component to produce the desired exothermic or endothermic reaction. Before describing the usage of the thermal pack 20 a further discussion of the two compartments 22 and 24 and their contents, 10 and 12, respectively, is in order.
As mentioned earlier one of the compartments is arranged to hold a flowable material, e.g., water in the case of a hot pack making use of quick-lime as the other exothermic-reaction inducing component. In the embodiment of the thermal pack 20 shown that compartment is the compartment 24. The other compartment 22, in the case of a quick-lime/water exothermic pack, serves to hold the quick-lime component 10. Since the quick-lime is dry particulate or powder material, it may tend to clump in the compartment 22 so that there may not be complete mixing of the water with it, thereby producing an uneven exothermic reaction. To overcome this potential problem and in accordance with another aspect of this invention, the dry particulate or powdery component 10 is preferably dispersed into separate portions, each housed in a respective pocket of a compartmentalized (e.g., quilted) insert 44. The insert is itself located in the compartment or pouch 22 of the pack 20.
The insert 44 may be formed of one or two sheets of a porous material, e.g., filter paper, which are sealed together, e.g., heat sealed or joined by an adhesive, along various seal lines to form a quilted body having plural pockets 46 therein. A portion of the dry component 10 is located in each pocket 46 to disperse it throughout the compartment 22. Since the material making up the walls of the insert 44 is porous, when the water 12 enters into the compartment 22 through the broken barrier 42, it can readily reach virtually all of the quick-lime at the same time, thereby resulting in an exothermic reaction that is spread evenly across the entire compartment 22.
The operation of the thermal pack 20 to produce heat or to provide cooling will now be described with reference to
If desired, the pack 20 may include another compartment (not shown) formed of a flexible material and located adjacent the compartment 22, and in which some item or product to be heated or cooled is located. For example, the pack may include an adjacent compartment in which a paper towel, wet wipe or some food product is located. Thus, when the exothermic or endothermic reaction is initiated it either heats/cools the item/product located in the adjacent compartment. The heated or cooled item/product can then be removed from its compartment for use. To facilitate the removal of the heated or cooled item/product the thermal pack 20 may include some means, e.g., tear notches (not shown) or a tear strip (not shown), which enable the compartment in which the heated/cooled item/product is located to be opened to remove it for use.
Referring now to
The compartments 102 and 104 of the thermal pack 100 are fabricated from a pair of wall panels 106 and 108, each formed of a flexible sheet material, like that forming the panels of thermal pack 20. The panel 106 is folded over itself as best seen in
The lower portion of the panel 108 is secured, e.g., welded, to the two overlying folded portions of the panel 106 by a transverse seal line 116, thereby forming the two compartments 102 and 104. The seal line 116 thus forms a barrier between the two compartments 102 and 104 from each other. Like the barrier 40 described above, the barrier 116 is constructed to be frangible so that it can be readily broken to enable the reaction inducing components 10 and 12 in the two compartments 102 and 104 to mix. To that end, a patterned peelable coating 118, e.g., polyethylene EVA copolymer with talc, is applied to either of the abutting surfaces at the seal line 116 as best seen in
In particular, the barrier 116 is designed so that when pressure is applied to the thermal pack, a hydraulic force is produced and propagated through the liquid component, e.g., water, 12 to act against the barrier 116 so that the peelable coating 118 thereat delaminates or peels apart, thereby rupturing the barrier. The water can then flow into the compartment 104, thereby mixing with the component 10, e.g., the quick-lime, located in the plural pockets 46 of the insert 44, to initiate the desired exothermic reaction.
The application of pressure to the compartment 104 can be achieved by disposing the pack 100 on a surface in its folded state, as shown in
In order to facilitate the rupturing of the barrier 116 it is preferably shaped so that the hydraulic force produced on it will be concentrated at one portion to cause it to begin to open thereat, with minimal applied force, and then to propagate along the length of the interface between barrier 116 and the patterned peelable coating 118. To that end, the central portion 120 of the transverse seal line 116 at the interface with the peelable coating is of a tapering shape, e.g., is generally V-shaped, tapering in the direction toward the compartment 102 (toward seal line 110). As should be appreciated by those skilled in the art, other arrangements to concentrate the force at a point on the frangible barrier can be used in lieu of the V-shaped seal portion.
As should be appreciated by those skilled in the art, the thermal packs of this invention are simple in construction, can be fabricated at low cost, yet are very easy to use and enable the quick, effective and even mixing of the reaction-producing components.
Without further elaboration the foregoing will so fully illustrate our invention that others may, by applying current or future knowledge, adopt the same for use under various conditions of service.
Claims
1. A thermal pack holding a pair of mixable components, one of which is flowable, said pair of mixable components being arranged when mixed to produce either an exothermic or endothermic reaction for heating or cooling, respectively, said thermal pack being formed of a flexible sheet material having a first panel, a second panel, and a pair of pull tabs, one of said pair of pull tabs being connected to said first panel, the other of said pair of pull tabs being connected to said second panel, said first panel being secured to said second panel to form a first compartment and a second compartment located between said panels, said first compartment being isolated from said second compartment by a frangible barrier located between said panels, said first compartment being arranged for holding a first one of said pair of mixable components, said second compartment being arranged for holding a second one of said pair of mixable components, said pair of pull tabs being coupled to said frangible barrier and being arranged to be grasped and pulled apart to break said frangible barrier, whereupon said mixable components can be mixed together to produce the desired exothermic or endothermic reaction.
2. The thermal pack of claim 1 wherein said second one of said mixable components is flowable and wherein said package is arranged to be oriented is a desired orientation so that when said frangible barrier is broken and said pack is in said desired orientation said second one of said mixable components flows into engagement with said first one of said mixable components.
3. The thermal pack of claim 1 wherein said sheet material forming said first and second panels is heat sealable, and wherein said first and second panels are heat sealed together to form said first and second compartments.
4. The thermal pack of claim 1 wherein said pack additionally comprises an insert having plural pockets, each of said pockets holding a respective portion of said first one of said mixable components therein.
5. The thermal pack of claim 4 wherein said insert comprises a first panel and a second panel secured together to form said pockets.
6. The thermal pack of claim 5 wherein said first and second panels of said insert are formed of flexible sheet material.
7. The thermal pack of claim 6 wherein said flexible sheet material of said insert is porous.
8. The thermal pack of claim 7 wherein said flexible sheet material of said insert is heat sealable.
9. The thermal pack of claim 1 wherein said pack is normally folded so that said first and second compartments are disposed overlying each other, with one of said pull tabs being disposed between said overlying compartments, and with the other of said pull tabs extending outward from the overlying compartments.
10. The thermal pack of claim 1 wherein said frangible barrier is formed by a peelable heat seal coating,
11. A thermal pack for holding a pair of mixable components, said pair of mixable components being arranged when mixed to produce either an exothermic or endothermic reaction for heating or cooling, respectively, said package being formed of a flexible sheet material having a first panel and a second panel, said first panel being secured to said second panel to form a first compartment and a second compartment, said first compartment being isolated from said second compartment by a frangible barrier located between said panels, said first compartment being arranged for holding a first one of said pair of mixable components, said second compartment being arranged for holding a second one of said pair of mixable components, said second one of said pair of mixable components being flowable, said pack being folded so that said first and second compartments are disposed overlying each other, whereupon the application of pressure to either said first or second compartment causes said second one of said mixable components to apply pressure to said frangible barrier to cause said frangible barrier to rupture, whereupon said second one of said mixable components engages and mixes with said first one of said mixable components to produce the desired exothermic or endothermic reaction.
12. The thermal pack of claim 11 wherein said sheet material forming said first and second panels is heat sealable, and wherein said first and second panels are heat sealed together to form said first and second compartments.
13. The thermal pack of claim 11 wherein said pack additionally comprises an insert having plural pockets, each of said pockets holding a respective portion of said first one of said mixable components therein.
14. The thermal pack of claim 13 wherein said insert comprises a first panel and a second panel secured together to form said pockets.
15. The thermal pack of claim 14 wherein said first and second panels of said insert are formed of flexible sheet material.
16. The thermal pack of claim 15 wherein said flexible sheet material of said insert is porous.
17. The thermal pack of claim 16 wherein said flexible sheet material of said insert is heat sealable.
18. The thermal pack of claim 11 wherein said frangible barrier is of a generally tapering shape, tapering in the direction from said second compartment to said first compartment.
19. The thermal pack of claim 18 wherein said frangible barrier is generally V-shaped.
20. The thermal pack of claim 19 wherein said frangible barrier is formed by a peelable heat seal coating.
Type: Application
Filed: Dec 14, 2010
Publication Date: Jun 14, 2012
Applicant: FRES-CO SYSTEM USA, INC. (Telford, PA)
Inventors: John Sheridan Thomas (Coopersburg, PA), Steven Burl Banko (Woodstown, NJ)
Application Number: 12/967,374
International Classification: B65D 25/04 (20060101);