A - Human Necessities – 24 – B
Patent
A - Human Necessities
24
B
A24B 3/18 (2006.01) A23P 1/14 (2006.01) D21B 1/36 (2006.01)
Patent
CA 2060219
A process and apparatus for impregnating a cellular material with liquefied gas at a predetermined pressure for subsequent expansion of the impregnated cellular material including the steps of charging the cellular material into an impregnation vessel, purging the impregnation vessel with inert gas, pressurizing the impregnation vessel with inert gas to the predetermined pressure, transferring liquefied inert gas into the impregnation vessel from a process vessel in which the liquefied gas is stored at the predetermined pressure, soaking the cellular material in the liquefied inert gas for a predetermined time period, transferring unabsorbed liquefied gas from the impregnation vessel to the storage vessel, depressurizing the impregnation vessel by venting the inert gas therefrom and removing the impregnated cellular material from the impregnation vessel, the inert gas used to purge and pressurize the impregnation vessel being taken from a source completely independent of the liquefied inert gas contained in the process vessel. Pressure and temperature variation in the process vessel is minimized by using an external source of inert gas for the purging and pressurization steps.
Gowling Lafleur Henderson Llp
The Boc Group Inc.
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