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Device for rapid defreezing of frozen or deep-frozen products
| Details |
Inventors: Barbini, Spartacus; Jolion, Michel;
Assignee: Electricite de France (Service National) (Paris, FR)
Primary Examiner: Reynolds; B. A.
Assistant Examiner: Leung; Philip H.
Attorney, Agent or Firm: Pearne, Gordon, Sessions, McCoy & Granger
Frozen or deep-frozen products transferred by a conveyor system within a furnace are subjected to radiation within the high-frequency or microwave range and to surface cooling which is carried out by electrostatic spraying of the products with cryogenic liquid consisting of liquid nitrogen or Freon R12. |
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DETAILED DESCRIPTION We claim: 1.
A device for defreezing frozen or deep-frozen products comprising: a furnace; a conveyor system comprising a grounded metal support on which the products to be defrozen are mounted and on which said products are passed through said furnace by means of said conveyor system; a generator for producing high-frequency radiation and radiating elements connected to said generator, said radiating elements being distributed in said furnace around the conveyor; means for electrostatic spraying of said products with a cryogenic liquid, said means comprising a cryogenic liquid supply, a sprayer including a cryogenic liquid duct connected to said supply, the distal portion of said duct constituting a bent metallic rod with an opening provided with a spraying cone, a metallic disc being mounted in front of said cone on the downstream side, said rod, said cone, and said disc being connected to a high electrostatic voltage source, said opening being adapted to receive a substantially liquid flow of the cryogenic liquid, said disc cooperating with said cone to disperse the cryogenic liquid into a substantially uniform jet of droplets, said sprayer being mounted at the entrance of said furnace.
2.
A device according to claim 1, wherein the rod of said sprayer has an axis inclined at an angle of a few degrees, with respect to the axis of the furnace, in a forward direction with respect to the motion of the products.
3.
A device according to claim 1, wherein cryogenic liquid flows through the sprayer at a flow rate lower than 1 kilogram per minute.
Description:
It is known that defreezing of deep-frozen or frozen products consists in increasing the temperature of these latter from approximately -18.
degree.
C.
(or lower) to room temperature in order to permit consumption or to facilitate any further treatments which may be required.
Especially in the case of agricultural food products, the abovementioned temperature increase or reheating process can take place in a natural manner by putting the product in contact with a ventilated atmosphere at a suitable temperature (positive, for example) or by immersing it in water which is maintained at a suitable temperature
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