CN107373297A - A kind of method for lifting radio frequency defrosting uniformity - Google Patents
A kind of method for lifting radio frequency defrosting uniformity Download PDFInfo
- Publication number
- CN107373297A CN107373297A CN201710812957.XA CN201710812957A CN107373297A CN 107373297 A CN107373297 A CN 107373297A CN 201710812957 A CN201710812957 A CN 201710812957A CN 107373297 A CN107373297 A CN 107373297A
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- Prior art keywords
- radio frequency
- food
- uniformity
- medium solution
- lifting
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/46—Dielectric heating
- H05B6/62—Apparatus for specific applications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/36—Freezing; Subsequent thawing; Cooling
- A23L3/365—Thawing subsequent to freezing
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- Health & Medical Sciences (AREA)
- Nutrition Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Freezing, Cooling And Drying Of Foods (AREA)
Abstract
A kind of method for lifting radio frequency defrosting uniformity, certain density medium solution is cooled to and frozen food identical temperature；The medium solution is poured into and is not easy by the container of radio frequency Wave heating；Food to be thawed is carried out pre-packaged；Pre-packaged frozen food is immersed into the medium solution；Food is thawed together with whole container and medium solution by radio heater.The present invention develop a kind of application widely complicated form food industrialization radio frequency defrosting uniformity improve scheme, defrosting food quality is improved, can be widely applied to various radio heaters and various frozen food, and medium solution and its repeatable utilization of container, cost is low, easy to operate.The present invention suitable for the corner concentration effect of regular shape food, is not required to complex scenarios such as conventional adjustment battery lead plate distance, battery lead plate sizes simultaneously, is also not required to reduce Thawing Rate to lift heating uniformity.
Description
Technical field
The present invention relates to a kind of method for lifting radio frequency defrosting uniformity.
Background technology
Rf wave is 1-300MHz electromagnetic wave, ion, atom, molecule of the frequency electromagnetic waves by encouraging food product etc.
Microcosmic particle vibrates or rotated so that food product is integrally rapidly heated, and reaches the rapid effect integrally heated.Typical radio frequency
Heater is parallel plate electrode formula (Fig. 1), i.e. two pieces of poles for being placed in parallel frequency electromagnetic waves access caused by radio-frequency signal generator
Plate, heated food are positioned in parallel plate electrode heating chamber, and electromagnetic energy is converted to heat energy in food product, and food is so as to be added
Heat.Radio frequency heating has the characteristics of overall and quick heating, is avoided that traditional heating mode causes to heat because of heating from outside to inside
Speed is slow, so that the quality of processed food has lifting by a relatively large margin, suitable for food drying, defrosting, sterilizing, desinsection, goes out
Most food hot-working fields such as enzyme.
As the development and the improvement of people's living standards of China's food industry and production capacity are limited, substantial amounts of livestock products
Product, aquatic products need import, and refrigeration transportation is often used as the method that food long-time long-distance transportation is effectively ensured.But
Frozen food is split after it need to largely be thawed after transporting to port, sells or is processed further.Thawing mode main at present has
Air thawing and water thawing, in such traditional approach course of defrosting, if the temperature of external heat source is too low to cause thawing rate
Cross the slow used time it is longer cause microbial reproduction too fast, and temperature is too high to cause food quality to deteriorate.Therefore after being thawed for guarantee
Food security and food quality, the new deforst technique that can be ensured food safety with quality need to be introduced.
Radio-frequency technique can still carry out penetrability heating on the premise of frozen food dielectric loss very little, can be to big
Block frozen product is thawed, and thawing rate is fast (10~20 minutes), and uniformity is preferable.Radio frequency thawing equipment the U.S.,
The states such as Japan, Europe a small amount of equipment and commercial application in meat, aquatic products thaw in.But during radio frequency heating
The corner concentration effect of energy, at present radio frequency thawing equipment generally small sized product is frozen just for regular shape frozen product
Become rectangular-shape or be fitted into concentrate in cuboid carton by the accumulation of sheet frozen product and thaw, thawed product quality preservation is equal
It is even.Corner concentration effect refers to that electric field can cross at these when there is two or more surfaces to cross at a certain angle
Edge has been concentrated, and causes the edge rate of heat addition to be far above product centre part.In order to solve corner concentration effect, patent
Document 1 (publication number CN101115406A) elaborates this problem, but only solves the rules such as cuboid, cylinder in partial extent
The homogeneity question that shape frozen food thaws, the temperature of complete irregular frozen food radio frequency course of defrosting can not be applied to
And greater homogeneity lifting.
The content of the invention
1st, technical problems to be solved
To solve the defects of radio frequency defrosting Energy distribution inequality existing for prior art, the present invention provides a kind of lifting radio frequency
The method of defrosting uniformity.
2nd, technical scheme
The purpose of the present invention is mainly realized by following technical scheme.
A kind of method of lifting radio frequency defrosting uniformity of the present invention, comprises the following steps：
1) liquid medium solution is poured into container, and pre-packaged is treated that unfrozen object includes medium solution described in immersing
Container；
2) it will treat that unfrozen object is thawed together with whole container and medium solution by radio heater.
Further, the medium solution be freezing point less than -20 DEG C, low toxicity and during radio frequency heating heating it is fast
Rate, which is less than, treats unfrozen object heating rate.
Further, before step 1), the medium solution is cooled to and treated the close temperature of unfrozen object.
Further, it is described to treat that unfrozen object is food.
Further, the medium solution is ethanol solution.
Further, the ethanol solution concentration is more than 40%.
Further, the described pre-packaged and container is using being not easy by the material of radio frequency heating.
Further, it is described to be not easy to include polypropylene material by the material of radio frequency heating.
Further, the material of the container is Teflon.
3rd, beneficial effect：
Compared with prior art, a kind of beneficial effect of the method for lifting radio frequency defrosting uniformity of the invention is：
Because of common many frozen food, such as whole chicken, bulk pig, ox ketoboidies etc. can not be adjusted to regular shape, in radio frequency
There is poor defrosting uniformity in course of defrosting.The present invention develops a kind of radio frequency of the extensive complicated form food of application
Defrosting uniformity improves scheme, improves defrosting food quality, can be widely applied to various radio heaters and various frozen food,
By the way that food is pre-packaged, food surface is set to be completely immersed in medium solution so that food uniformly heats in all directions, is advantageous to eat
The uniformity that product thaw.And ethanol solution and the repeatable utilization of its container, cost is low, easy to operate.The present invention is simultaneously suitable for rule
The then corner concentration effect of shaped food, it is not required to complex scenarios such as conventional adjustment battery lead plate distance, battery lead plate sizes,
It is not required to reduce Thawing Rate to lift heating uniformity.
Brief description of the drawings
Fig. 1 is parallel plate electrode formula radio heater sketch.
Fig. 2 is ethanol solution as the schematic diagram used around medium in radio frequency course of defrosting.
In figure：1- radio-frequency signal generators, 2- electric pole plates, 3- bottom electrode plates, 4- food, 5- containers, 6- medium solutions.
Embodiment
Hereinafter, the specific embodiment of the present invention is described in detail refer to the attached drawing, detailed according to these
Description, one of ordinary skill in the art can implement the present invention it can be clearly understood that the present invention.Without prejudice to the principle of the invention
In the case of, the feature in each different embodiment can be combined to obtain new embodiment, or is substituted some
Some features in embodiment, obtain other preferred embodiments.
Fig. 1-2 shows the device schematic construction for the method for realizing a kind of lifting radio frequency defrosting uniformity of the present invention.Such as
The frozen food radio frequency defrosting course of work of the invention shown in Fig. 2：Certain density ethanol water is cooled to and eaten with freezing
Product identical temperature, pour into and be not easy in the container 5 by radio frequency Wave heating, pre-packaged frozen food 4 is immersed into ethanol water,
And food is thawed together with whole container 5 and ethanol solution by radio heater.In batch course of defrosting, can directly it beat
Radio heater door is opened, is put into all above-mentioned objects, opens radio heater, sample is taken out until thawing and completing opening door.Even
In continuous formula course of defrosting, all above-mentioned objects can be made while radio heater is carried through by conveyer belt, can also make ethanol water
Solution cycles through heat exchanger, ensures that its temperature is suitable with food temperature.
Operation principle is：Ethanol is polar solvent, and the dielectric loss in radio frequency band is low, it is difficult to by radio frequency Wave heating.
Ethanol solution freezing point more than 40% concentration below -30 DEG C, therefore -20 DEG C of conventional food cryogenic temperature nearby when be still
Liquid, there is the contact good with treating defrosting food.That is, it is desirable to which the freezing point of selected medium solution is eaten less than freezing
The cryogenic temperature of product, then when medium solution is cooled to when the temperature of defrosting food, the medium solution is still liquid, be allowed to
Treat the good contact of defrosting food.In course of defrosting, ethanol solution has completely cut off air and frozen food well, reduces
Corner energy concentration effect, and ethanol solution absorbs few electromagnetic energy in itself, and energy dissipation is minimized, it is raw suitable for industry
Production.
Specific embodiment
It is 285*190*80mm with size3Cuboid polypropylene box, temperature is inside poured into as -30 DEG C, concentration is 60%
Ethanol solution.By a block-shaped irregular 1.5kg or so fresh beef, be frozen in -30 DEG C of refrigerators more than 24 hours until
Sample integrally all reaches -30 DEG C.The beef freezed is vacuum-packed with polypropylene screen, and is put into ethanol solution.By box
It is put into SairemLabotronIn parallel plate electrode formula radio heater, adjustment pole plate spacing is 115mm.Heat time sets
It is set to 5 minutes, after heating terminates, stops radio heater immediately, beef sample is taken out, removes packaging, move to FLIR rapidly
The temperature collection of illustrative plates shooting on surface, section is carried out under SC655 thermal infrared imagers, and calculates Temperature Distribution average and positive and negative deviation representative
Defrosting uniformity.With without using method proposed by the present invention, directly carrying out the beef of radio frequency defrosting under same radio frequency thawing condition
Sample is contrasted.Before application the inventive method, the degree of irregularity of defrosting sample is ± 11 DEG C, using uneven after this method
Even degree is promoted to ± 3 DEG C.
Although above by referring to specific embodiment, invention has been described, and one of ordinary skill in the art should
Work as understanding, in principle disclosed by the invention and scope, configuration disclosed by the invention can be directed to and details makes many modifications.
For example, although this specification describes defreezing method by taking food as an example, the defreezing method obviously can also remove suitable for defrosting
Other freezing objects outside food.Protection scope of the present invention is determined by appended claim, and claim is anticipated
Whole modifications that the equivalent literal meaning of technical characteristic or scope are included in claim is covered.
Claims (9)
- A kind of 1. method for lifting radio frequency defrosting uniformity, it is characterised in that：Comprise the following steps：1) liquid medium solution is poured into container, and by it is pre-packaged treat unfrozen object immerse described in include medium solution appearance Device；2) it will treat that unfrozen object is thawed together with whole container and medium solution by radio heater.
- 2. a kind of method for lifting radio frequency defrosting uniformity as claimed in claim 1, it is characterised in that the liquid medium is molten Liquid be freezing point less than -20 DEG C, low toxicity and during radio frequency heating heating rate be less than treat unfrozen object heating rate.
- A kind of 3. method for lifting radio frequency defrosting uniformity as claimed in claim 2, it is characterised in that before step 1), The medium solution is cooled to and treated the close temperature of unfrozen object.
- 4. a kind of method for lifting radio frequency defrosting uniformity as claimed in claim 3, it is characterised in that described to treat unfrozen object For food.
- 5. a kind of method of lifting radio frequency defrosting uniformity as described in one of claim 1-4 is characterized in that, the medium Solution is ethanol solution.
- 6. a kind of method for lifting radio frequency defrosting uniformity as claimed in claim 5, it is characterised in that the ethanol solution is dense Degree is more than 40%.
- A kind of 7. method for lifting radio frequency defrosting uniformity as claimed in claim 6, it is characterised in that described pre-packaged and institute Container use is stated to be not easy by the material of radio frequency heating.
- 8. a kind of method for lifting radio frequency defrosting uniformity as claimed in claim 7, it is characterised in that described to be not easy by radio frequency The material of heating includes polypropylene material.
- A kind of 9. method for lifting radio frequency defrosting uniformity as claimed in claim 7, it is characterised in that the material of the container For Teflon.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710812957.XA CN107373297A (en) | 2017-09-11 | 2017-09-11 | A kind of method for lifting radio frequency defrosting uniformity |
| PCT/CN2018/103785 WO2019047800A1 (en) | 2017-09-11 | 2018-09-03 | Radio-frequency heating method and radio-frequency heating device |
| US16/804,363 US11751297B2 (en) | 2017-09-11 | 2020-02-28 | Radio frequency heating method and radio frequency heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710812957.XA CN107373297A (en) | 2017-09-11 | 2017-09-11 | A kind of method for lifting radio frequency defrosting uniformity |
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| Publication Number | Publication Date |
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| CN107373297A true CN107373297A (en) | 2017-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710812957.XA Pending CN107373297A (en) | 2017-09-11 | 2017-09-11 | A kind of method for lifting radio frequency defrosting uniformity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019047800A1 (en) * | 2017-09-11 | 2019-03-14 | 上海海洋大学 | Radio-frequency heating method and radio-frequency heating device |
| CN115299488A (en) * | 2022-07-06 | 2022-11-08 | 浙江海洋大学 | Graphene-assisted radio frequency thawing technology for improving fish meat thawing quality |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5534044A (en) * | 1978-09-01 | 1980-03-10 | Hitachi Ltd | Radiofrequency thawing device |
| JP2003332037A (en) * | 2002-05-16 | 2003-11-21 | Mitsubishi Electric Corp | High frequency dielectric heating device and refrigerating apparatus |
| CN1545823A (en) * | 2001-08-23 | 2004-11-10 | 俄勒冈州,由高等教育州委员会代表俄勒 | Variable frequency automated capacitive radio frequency (RF) dielectric heating system |
| CN105940266A (en) * | 2014-12-17 | 2016-09-14 | 皇家飞利浦有限公司 | Method and apparatus for controlling heating of food ingredients |
-
2017
- 2017-09-11 CN CN201710812957.XA patent/CN107373297A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5534044A (en) * | 1978-09-01 | 1980-03-10 | Hitachi Ltd | Radiofrequency thawing device |
| CN1545823A (en) * | 2001-08-23 | 2004-11-10 | 俄勒冈州,由高等教育州委员会代表俄勒 | Variable frequency automated capacitive radio frequency (RF) dielectric heating system |
| JP2003332037A (en) * | 2002-05-16 | 2003-11-21 | Mitsubishi Electric Corp | High frequency dielectric heating device and refrigerating apparatus |
| CN105940266A (en) * | 2014-12-17 | 2016-09-14 | 皇家飞利浦有限公司 | Method and apparatus for controlling heating of food ingredients |
Non-Patent Citations (1)
| Title |
|---|
| 陈智斌等: "《食品加工学》", 31 August 2012 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019047800A1 (en) * | 2017-09-11 | 2019-03-14 | 上海海洋大学 | Radio-frequency heating method and radio-frequency heating device |
| US11751297B2 (en) | 2017-09-11 | 2023-09-05 | Shanghai Ocean University | Radio frequency heating method and radio frequency heating device |
| CN115299488A (en) * | 2022-07-06 | 2022-11-08 | 浙江海洋大学 | Graphene-assisted radio frequency thawing technology for improving fish meat thawing quality |
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Application publication date: 20171124 |
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