Microwavable thermal compress and method and use thereof

• US 4,920,964 A
• Filed: 05/31/1988
• Issued: 05/01/1990
• Est. Priority Date: 05/15/1985
• Status: Expired due to Fees

• Current Assignee: Jack Frost Laboratories, Inc.
• Original Assignee: Jack Frost Laboratories, Inc.
• Inventors: Francis, Sam E. Jr.
• Primary Examiner(s): Oechsle, Anton O.
• Application Number:
  US07/200,429
• Time in Patent Office: 700 Days
• Field of Search: 128/402, 128/403, 62/530, 126/204, 156/DIG. 108, 165/46, 426/410, 426/412, 426/415, 383/901
• US Class Current: 607/114
• CPC Class Codes: A61F 2007/0242 heated by microwaves
• CPC Class Codes: A61F 7/02 Compresses or poultices for effecting heating or cooling
• CPC Class Codes: F25D 2303/0822 Details of the element

Abstract

A microwavable thermal pack and a method of heating the pack. The thermal pack is a completely sealed envelope constructed from opposed laminate layers, portions of which are joined by sealed seams. The layers define an inner chamber within which is disposed a heat transfer material. Each of the laminate layers includes a pair of co-extensive inner and outer films contacting each other throughout their surface areas. The films are selected so that the laminate layers of the thermal pack do not pass the heat transfer material during heating of the heat transfer material within the thermal pack which is equivalent to the energy developed by a microwave device operating at full power for a period of time greater than about one minute but less than about four minutes.

Claims

1. A process of microwave heating a thermal pack comprising the steps of:

providing a thermal pack comprising a completely sealed envelope constructed from opposed laminate layers, said layers defining an inner chamber within which is disposed a heat transfer material, said chamber being sealed from the exterior of said thermal pack, each of said laminate layers including a pair of co-extensive inner and outer films contacting each other throughout their surface ares, said films being of dissimilar materials;

applying microwave energy to said pack for heating said heat transfer material to a desired temperature; and

selecting the dissimilar materials so that the laminate layers of said thermal pack do not pass said heat transfer material during heating of said thermal pack and do not rupture or separate at the seams thereof when subjected to said microwave energy which is equivalent to the energy developed by a microwave heating device operating at full power of about 750 watts for a period of time greater than about one minute but less than about four minutes.

2. A process as set forth in claim 1, wherein said dissimilar materials are synthetic resins.

3. A process as set forth in claim 1, wherein said inner film is polyethylene.

4. A process as recited in claim 2, wherein said dissimilar materials are synthetic resins and the outer film is nylon and the inner film is Nylon-Sclair.

5. A process as set forth in claim 1 wherein said outer film is nylon.

6. A process as set forth in claim 5, wherein the outer film has a thickness of one mil and the inner film has a thickness of two mils.

7. A process as set forth in claim 1 wherein said gel includes water and said films are impervious to the passage of steam produced during heating of said gel pack.

15. The process of claim 1, wherein said period of time is less than three minutes.

16. The process of claim 1, wherein said period of time is less than two minutes.

8. A process of treating a surface of a body comprising the steps of:

(a) utilizing an instant chemical thermal pack including unreactive chemicals;

(b) causing said chemicals to react to produce a cold or heated pack;

(c) placing said cold or heated pack in contact with said body to transfer heat thereto;

(d) removing said pack from said body when the temperature of the pack is substantially at ambient;

(e) immediately reheating said pack by microwave energy for a period of time of about 2.0 minutes, and thereafter again placing said heated pack in heat transfer relationship with said body.

9. A microwave thermal pack comprising:

a completely sealed envelope construed from opposed laminate layers portions of which are joined by sealed seams, said layers defining an inner chamber within which is disposed a heat transfer material, said chamber being sealed from the exterior of said thermal pack, each of said laminate layers including a pair of co-extensive inner and outer films contacting each other throughout their surface areas, said films being of dissimilar materials; and

said dissimilar materials being selected so that the laminate layers of said thermal pack do not pass said heat transfer material during heating of the heat transfer material within said thermal pack and do not rupture or separate at the seams thereof when subjected to microwave energy which is equivalent to the energy developed by a microwave heating device operating at full power of about 750 watts for a period of time greater than about one minute but less than about four minutes.

10. An article of manufacture as set forth in claim 9, wherein said dissimilar materials are synthetic resinous films, or a paper layer adhered to a resinous layer or a fabric layer adhered to a resinous layer.

11. An article of manufacture as set forth in claim 10, wherein said resinous layer is selected from the group consisting of polyethylene and polyurethane.

12. An article of manufacture as set forth in claim 9, wherein the inner and outer films of synthetic resins and the inner film is selected from the group consisting of polyethylene and Nylon-Sclair.

13. An article of manufacture as set forth in claim 12, wherein said outer film is nylon.

14. An article of manufacture as set forth in claim 13, wherein the outer film has a thickness of about one mil and the inner film has a thickness of about two mils.

17. The thermal pack of claim 9, wherein said period of time is less than three minutes.

18. The thermal pack of claim 9, wherein said period of time is less than two minutes.

19. A process of microwave heating a thermal pack comprising the steps of:

providing a thermal pack comprising a completely sealed envelope constructed from opposed laminate layers, said layers defining an inner chamber within which is disposed a heat transfer material, said chamber being sealed from the exterior of said thermal pack, each of said laminate layers including a pair of co-extensive inner and outer films contacting each other throughout their surface areas, said films being of dissimilar materials;

applying microwave energy to said pack for heating said heat transfer material to a desired temperature; and

selecting the dissimilar materials so that the laminate layers of said thermal pack do not pass said heat transfer material during heating of said thermal pack and do not rupture or separate at the seams thereof when subjected to said microwave energy which is equivalent to the energy developed by a microwave heating device operating at full power of about 750 watts for a period of time equal to about one minute.

20. A process as set forth in claim 19, wherein said dissimilar materials are synthetic resins.

21. A process as set forth in claim 19, wherein said inner film is polyethylene.

22. A process as set forth in claim 19, wherein the outer film is nylon.

23. A process as recited in claim 20, wherein said dissimilar materials are synthetic resins and the outer film is nylon and the inner film is Nylon-Sclair.

24. A process as set forth in claim 22, wherein the outer film has a thickness of one mil and theinner film has a thickness of two mils.

25. A microwave thermal pack comprising:

a completely sealed envelope constructed from opposed laminate layers, portions of which are joined by sealed seams, said layers defining an inner chamber within which is disposed a heat transfer material, said chamber being sealed from the exterior of said thermal pack, each of said laminate layers including a pair of co-extensive inner and outer films contacting each other throughout their surface areas, said films being of dissimilar materials; and

said dissimilar materials being selected so that the laminate layers of said thermal pack do not pass said heat transfer material during heating of the heat transfer material within said thermal pack and do not rupture or separate at the seams thereof when subjected to microwave energy which is equivalent to the energy developed by a microwave heating device operating at full power of about 750 watts for a period of time equal to about one minute.

26. A microwave thermal pack as set forth in claim 25, wherein said dissimilar materials are synthetic resinous films, or a paper layer adhered to a resinous layer or a fabric layer adhered to a resinous layer.

27. A microwave thermal pack as set forth in claim 26, wherein said resinous layer is selected from the group consisting of polyethylene and polyurethane.

28. A microwave thermal pack as set forth in claim 25, wherein the inner and outer films of synthetic resins and the inner film is selected from the group consisting of polyethylene and Nylon-Sclair.

29. A microwave thermal pack as set forth in claim 28, wherein said outer film is nylon.

30. A microwave thermal pack as set forth in claim 29, wherein the outer film has a thickness of about one mil and the inner film has a thickness of about two mils.