| 摘要 |
An improved method and apparatus for the transformation of a liquid product into flakes by freezing, said method utilizing a cylinder rotating about its own axis and having its outer face passing in succession in front of a station at which a thin layer of said liquid is deposited on said outer face, and a station adapted to scrape-off said thin layer in the frozen state, the cooling being effected inside said cylinder by a refrigerant fluid injected into the interior of said cylinder and adapted to circulate in heat-exchange relation with said cylinder, in which method substantially all the internal volume of said cylinder is caused to participate in the heat-exchange process by injecting a cryogenic liquid as the refrigerant fluid in circulation in a plurality of conduits in heat-exchange with a thermal filling medium occupying substantially all the interstitial space between said conduits and the outer face of said freezing cylinder, the vaporization of said cryogenic liquid and the heating of the vapours being effected in said conduits. The cryogenic liquid may be for example liquid nitrogen.
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