Package having phase change materials and method of use in transport of temperature sensitive payload
The present invention is directed to a transport package which efficiently maintains payload temperature within a predetermined temperature range during delivery through regions having ambient temperatures outside the desired range. The transport package is used for transporting temperature sensitive materials and thermally protecting the materials from cold and hot ambient temperatures in a manner that does not require a power source or other mechanical devices. Aspects of the invention relate to a temperature maintaining packaging system having an outer container, thermal insulation materials and two or more different phase change materials.
1. A package for transporting a temperature sensitive payload comprising:
a container defining an interior volume;
a plurality of insulation panels contained within the interior volume;
a first hollow generally rectangular panel contained within the interior volume, said first hollow panel containing a first phase change material;
a second hollow generally rectangular panel in thermal contact with the first hollow panel, said second hollow panel containing a second phase change material;
preconditioning some of the plurality of phase change material into solid form; and
preconditioning a different some of the plurality of phase material into liquid form,
wherein some of said plurality of phase change material changes phase from liquid to solid above a lower protection temperature and the different some of said plurality of phase change material changes from solid to liquid below a higher protection temperature, said lower and higher protection temperatures defining the temperature range for payload protection.
2. The package of claim 1 wherein the payload is substantially surrounded by one of the plurality of phase change materials.
3. The package of claim 1 wherein the payload is substantially surrounded by two of the plurality of phase change materials.
4. A method for shipping a temperature sensitive payload within an insulated container comprising:
thermally conditioning a first rectangular panel containing one of a plurality of phase change materials to a temperature outside a desired temperature range for thermal protection of a payload within the container;
thermally conditioning a second rectangular panel containing a different one of the plurality of phase change materials to a temperature within the desired temperature range;
inserting the second panel adjacent a payload volume;
inserting the first panel, with said second panel separating the first panel from the payload volume, with said second panel thermally buffering the payload volume from thermal damage from the first panel and;
inserting insulation panels around the payload volume, with both of said first panel and said second panel being positioned between at least one of the insulation panels and the payload volume.
5. The method of claim 4 wherein said conditioning includes obtaining an estimate of temperatures through which the container will pass during transport, and conditioning at least one of the plurality of phase change temperatures based on said estimate.
6. The method of claim 4 wherein the payload is substantially surrounded by one of the plurality of phase change materials.
7. The method of claim 4 wherein the payload is substantially surrounded by at least two of the plurality of phase change materials.
8. A package for transporting a temperature sensitive payload comprising:
a plurality of insulation panels being placed within a container interior;
a plurality of panels containing phase change materials being placed within the container interior, with at least one panel including a phase change material being thermally preconditioned to a temperature outside of a desired thermal protection range of a temperature sensitive payload and at least another panel including a different phase change material being thermally preconditioned to a temperature within the desired thermal protection range, with said second panel thermally buffer the payload from thermal damage from said first panel; and
a payload section sized to receive the temperature sensitive payload, said payload section being defined upon removal of at least some of the plurality of phase change materials from the container upon delivery to a remote location.
9. The package of claim 8 wherein the payload section is defined within one of the plurality of phase change materials.
10. The package of claim 8 wherein the payload section is enclosed by at least two of the phase change materials.
11. The package of claim 8 wherein the insulation and the plurality of phase change materials are provided in separate containers.
12. The package of claim 8 wherein only some of the phase change materials are water-based.