Thawing-apparatus and method to thaw a substance
The present invention relates to a thawing-apparatus, in which a substance is preferably heated. The present invention further relates to a method to thaw a substance with radio-frequency waves.
1 . A thawing apparatus, in which a frozen substance is heated to a temperature in a vicinity of 0° C., wherein the thawing apparatus comprises:
a product chamber, in which the substance is heated;
a plurality of solid-state radio frequency sources that are located around a circumference of the product chamber;
a plurality of chambers disposed around the circumference of the product chamber, one or more of which contain one of the plurality of solid-state radio frequency sources;
a microwave tube/sphere that is disposed around the circumference of the product chamber and that separates the product chamber from the plurality of chambers, wherein a material of the microwave tube/sphere is transparent for microwaves;
a conveyor to transport the substance past the plurality of solid-state radio frequency sources, the conveyor being at least partially transmittable for RF-radiation (Radio Frequency-radiation);
wherein the thawing apparatus comprises a housing in which the product chamber is located, the housing comprises a plurality of openings defined around its circumference, each of the plurality of openings lead to one of the plurality of chambers in which one of the plurality of solid-state radio frequency sources are located, and
a waveguide covering one or more of the plurality of openings and configured to direct the RF-radiation in a direction of the substance.
2 . The thawing apparatus according to claim 1 , wherein the plurality of solid-state radio frequency sources are provided in an array of n columns and m rows, wherein n is an integer >1 and m is an integer ≥1.
3 . The thawing apparatus according to claim 1 , wherein the plurality of solid-state radio frequency sources are provided equidistantly around the circumference of product chamber.
4 . The thawing apparatus according to claim 1 , wherein the thawing apparatus comprises an inlet and an outlet, which are spaced apart from each other.
5 . The thawing apparatus according to claim 1 , wherein the substance is provided as a batch, which is placed in a vicinity of the plurality of solid-state radio frequency sources.
6 . The thawing apparatus according to claim 1 , wherein the thawing apparatus comprises a control system to control at least one of the plurality of solid-state radio frequency sources.
7 . The thawing apparatus according to claim 1 , wherein the thawing apparatus comprises a control system and a sensor that measures at least one property of the substance and/or one property of radiation reflected from the substance, wherein a signal of the sensor is utilized by the control system.
8 . The thawing apparatus according to claim 1 , wherein the thawing apparatus is at least partially isolated by one or more valves.
9 . A production line comprising the thawing apparatus according to claim 1 .
10 . The production line according to claim 9 , wherein the production line comprises a tumbler or a mixer downstream from the thawing apparatus.
11 . The production line according to claim 9 , wherein the production line comprises a cooling means downstream from the thawing apparatus and/or from a tumbler/mixer.
12 . A method of thawing the substance with the thawing apparatus according to claim 1 , wherein radio-frequency waves are provided with one or more of the plurality of solid-state radio frequency sources.
13 . The method according to claim 12 , wherein the substance is transported from an inlet to an exit which are spaced apart and the substance is transported by the conveyor continuously or intermittently.
14 . The method according to claim 12 , wherein one or more sensors are provided which measure one or more properties of the substance and/or radiation reflected from the substance, and optionally one or more signals from the one or more sensors are utilized to control one or more of the plurality of solid-state radio frequency sources.
15 . The method according to claim 12 , wherein the substance is further heated by steam and/or a heated jacket and/or heated carrier of a tumbler or mixer, and mixed under vacuum and/or the substance is cooled after the thawing and/or further heating and/or the substance is subjected to microwave radiation, at least temporarily in a film-cover.
16 . The thawing apparatus according to claim 1 , wherein the thawing apparatus comprises a sensor that measures energy absorbed by the substance to control at least one of the plurality of solid-state radio frequency sources so that a crystallization point of the substance is not exceeded.
17 . The thawing apparatus according to claim 1 , wherein the substance is in contact with an inner circumference of the microwave tube/sphere, at least locally.
18 . The thawing apparatus according to claim 1 , wherein the plurality of openings are spaced about 72 degrees apart or about 90 degrees apart.
19 . A thawing apparatus in which a frozen substance is heated to a temperature in a vicinity of 0° C., wherein the thawing apparatus comprises:
a product chamber, in which the substance is heated;
a plurality of solid-state radio frequency sources that are located around a circumference of the product chamber;
a conveyor to transport the substance past the plurality of solid-state radio frequency sources, the conveyor being at least partially transmittable for RF-radiation (Radio Frequency-radiation),
wherein the thawing apparatus has at least one configuration selected form a group consisting of:
a) a plurality of chambers disposed around the circumference of the product chamber, one or more of which contain one or more of the plurality of solid-state radio frequency sources;
b) a microwave tube/sphere that is disposed around the circumference of the product chamber, that separates the product chamber from the plurality of chambers; and optionally a material of the microwave tube/sphere is transparent for microwaves; and optionally the substance is in contact with an inner circumference the microwave tube/sphere, at least locally;
c) the thawing apparatus comprises a housing in which the product chamber is located, the housing comprises a plurality of openings defined around its circumference, one or more of the plurality of openings lead to one of the plurality of chambers; and optionally the plurality of openings are spaced about 72 degrees apart or about 90 degrees apart;
d) a waveguide covering one or more of the plurality of openings and configured to direct the RF-radiation in a direction of the substance.
20 . The thawing apparatus according to claim 19 , wherein the thawing apparatus comprises one or more sensors that measure energy absorbed by the substance to control at least one of the plurality of solid-state radio frequency sources.