| 摘要 |
A closed pressure vessel is provided having a cryogenic liquid bath therein utilizing a bath liquid having a low boiling point temperature. Product treatment ingress and egress structure incorporating vapor lock structure is provided for passing a product to be treated into the interior of the vessel from the exterior thereof and from within the vessel to the exterior thereof and the interior of the vessel includes product support structure operative to support a product to be treated within the cryogenic liquid only as long as it is necessary to lower the outer boundary layer, only, of the product to a temperature below the aforementioned boiling point temperature and which is operable to then remove the product being treated from within the bath and, after a predetermined time interval, and in conjunction with the vapor lock structure, past the treated product to the exterior of the vessel, the aforementioned predetermined time interval being as long as necessary to allow the residual heat in the product inwardly of the outer boundary layer thereof to migrate to the outer boundary layer outer surfaces for the purpose of vaporizing any cryogenic liquid remaining on the external surfaces of the product before the product passes from the interior of the vessel to the exterior thereof. Further, cryogenic liquid condensing structure is disposed within the pressure vessel and operative to condense the cryogenic liquid vaporized from the exterior surfaces of the product treated and direct the condensed liquid back to the cryogenic liquid bath.
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