GB1595552A - Methods for the heat treatment of products and apparatus for carrying out the method - Google Patents

Methods for the heat treatment of products and apparatus for carrying out the method Download PDF

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Publication number
GB1595552A
GB1595552A GB508878A GB508878A GB1595552A GB 1595552 A GB1595552 A GB 1595552A GB 508878 A GB508878 A GB 508878A GB 508878 A GB508878 A GB 508878A GB 1595552 A GB1595552 A GB 1595552A
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GB
United Kingdom
Prior art keywords
fluid
products
conveyor belt
covering layer
belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB508878A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
John Bean Technologies AB
Original Assignee
Frigoscandia Contracting AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Frigoscandia Contracting AB filed Critical Frigoscandia Contracting AB
Publication of GB1595552A publication Critical patent/GB1595552A/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D25/00—Charging, supporting, and discharging the articles to be cooled
    • F25D25/04—Charging, supporting, and discharging the articles to be cooled by conveyors
    • 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
    • A23L3/16—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials
    • A23L3/18—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials while they are progressively transported through the apparatus
    • A23L3/185—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials while they are progressively transported through the apparatus in solid state
    • 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
    • A23L3/361—Freezing; Subsequent thawing; Cooling the materials being transported through or in the apparatus, with or without shaping, e.g. in form of powder, granules, or flakes
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Food Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Nutrition Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Defrosting Systems (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Structure Of Belt Conveyors (AREA)

Description

(54) IMPROVEMENTS IN OR RELATING TO METHODS FOR THE HEAT TREATMENT OF PRODUCTS AND APPARATUS FOR CARRYING OUT THE METHOD (71) We, FRIGOSCANDIA CON TRACTING AB, a company duly organized and existing under the laws of Sweden, of Fack, S-251 00 HELSING BORG, Sweden, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to a method for heat treatment, such as thawing or cooling/freezing of products, especially food products, by means of a fluid, especially liquid, causing the products to exchange heat.
The invention also relates to an apparatus for carrying out the method.
A type of heat treatment, often operated on an industrial scale, is thawing of deepfrozen food products. For this purpose various methods are used, among which there may be mentioned, for example, treatment with stationary or circulating hot air, circulating cold or hot water and dielectric heating.
However, conventional methods involve obvious drawbacks. Air treatment, for instance, results in drying of the surface layers of the products while direct treatment with water results in leaching and undesired disintegration or dissolution of the product.
In the opposite case, i.e. when lowering the temperature of the products and especially when such a decrease lies within temperature ranges where the produce has not yet passed from a plastic to a solidified state, the problems encountered are very much the same. Thus, for example, air treatment with current of cold air may cause drying and liquid treatment may cause leaching or at least partial disintegration or dissolution of the product at its outer portions.
The method of the present invention is characterised by the following steps:- placing the products on a support in the form of a conveyor belt or like means of high thermal conductivity; covering the products with a thin film web material forming a fluid-tight and flexible covering layer that is movable in parallel with the conveyor belt and has a width greater than that of the products resting on the support; flushing the underside of the support with fluid of a temperature different from that of the products while flushing under pressure also the top side of the covering layer with such a fluid, said covering layer being caused by said flushing closely to follow the surfaces exposed above the belt of the products and adjacent portions of the support under the influence of the mass and movement of the fluid, so as to maximize the area over which heat exchange with the fluid takes place, at the same time as the covering layer prevents the fluid from coming into contact with the product.
The apparatus for carrying out the method is characterised in that it comprises a conveyor belt formed of material of high thermal conductivity which is accessible for flushing with fluid from below as well as from above, and a thin, fluid-tight and flexible covering layer which is placed upon said conveyor belt, covering said products, is movable in parallel therewith and has a width greater than that of the products resting on the conveyor belt.
The method of the invention will be described in more detail hereinbelow with reference to the figures of the accompanying drawings which illustrate by way of example two preferred embodiments of apparatuses for carrying out the method and in which : Figure 1 is a schematic side elevation of one embodiment; Figure 2 is a schematic side elevation of the other embodiment; and Figure 3 is a schematic cross-sectional view to a larger scale on the section station A-A of Figure 1 and 2.
An endless conveyor belt 1 of stainless steel or equivalent material of high thermal conductivity runs over end rollers 2 arranged at either end of a chamber 4, represented by thin lines in the drawings, which is substantially closed but has an opening 3 at either end. The forward run (in the drawing from right to left) of the belt 1, which carries the unwrapped products X, passes through the chamber 4 while the return run passes outside the chamber, as shown. Arranged within the chamber 4, over and under the belt 1, is a number of flushing nozzles 5 for fluid brought to a correct temperature and these are connected to a supply conduit 6 for fluid from a heat exchanger 7, in which the fluid will be given a predetermined temperature. A discharge or return conduit 8 is joined to the sloping bottom of the chamber 4 and via this conduit any liquid spurted out into the chamber is returned to the heat exchanger 7.
A covering layer of thin, water-proof and flexible material is placed on the conveyor belt 1. In the embodiment of Figure 1 the covering layer consists of a web of film 9' which is unrolled from a roller 10, travels in parallel with the conveyor belt 1 and is rolled up on a roller 11. The film web may be of the disposable or reusable type.
In the embodiment of Figure 2 the covering layer is in the form of an endless band 9" passing over end rollers 12.
As is clearly apparent from Figure 3, the covering layer 9', 9" is wider than the conveyor belt 1 so that the covering layer may hang down at the edges of the conveyor belt and also closely follow the surfaces exposed above the belt 1 of the products X.
To prevent brine, meat-juice or like subst ances. from flowing over the belt edges said belt is provided with raised edges 13, suitably in the form of rubber or like beads vulcanized thereon.
As the fluid via the nozzles 5 situated over the belt will be supplied under pressure the covering layer 9',9" will be pressed down against the top side and edge surfaces of the produces X, which gives a large contact surface for the fluid and good heat transfer.
With the apparatus of the invention the products X will be entirely covered by the covering layer which under the influence of the fluid supplied closely follows the configuration of the products. Due to the insignificant thickness of the material of the covering layer the heat transfer between the fluid and the product, and inversely, is not prevented to any provable extent. Since large quantities of fluid can be supplied, deep frozen products can be thawed in a considerably shorter time than that possible with previously known methods, without any risk of leaching or dissolution phenomena.
Certain substances emanating from the products are retained on the belt and cannot mix with the heat treatment fluid, these can be allowed to circulate and recycled. The consumption of fluid, which represents a not insignificant cost item, can thus be kept on an acceptable level.
The illustrated apparatus is primarily intended for use in thawing deep-frozen products but it is obvious that it may just as well be utilised for cooling and/or freezing of products.
The fluid generally used in water.
WHAT WE CLAIM IS: 1. A method for heat treatment of unwrapped products, especially food products, by means of a fluid, especially a liquid which has a temperature different from that of the products and is caused to supply heat to the product or remove heat therefrom, comprising the following steps:- placing the products on a support in the form of a conveyor belt or like means of high thermal conductivity; covering the products with a thin film web material forming a fluid-tight and flexible covering layer that is movable in parallel with the conveyor belt and has a width greater than that of the products resting on the support; flushing the underside of the support with fluid of a temperature different from that of the products while flushing under pressure also the top side of the covering layer with such a fluid, said covering layer being caused by said flushing closely to follow the surfaces exposed above the belt of the products and adjacent portions of the support under the influence of the mass and movement of the fluid, so as to maximize the area over which heat exchange with the fluid takes place, at the same time as the covering layer prevents the fluid from coming into contact with the product.
2. Apparatus for carrying out the method of Claim 1, comprising in combination a conveyor belt formed of material of high thermal conductivity accessible for flushing with fluid from below, a thin film web material forming a fluid-tight and flexible covering layer that is placed above said conveyor belt, covering said products and is movable in parallel therewith and has a width greater than that of the products resting on the conveyor belt to enable it under flushing conditions closely to follow the surfaces exposed above the belt of the said products to hang down at the edges of the conveyor belt and means for passing under pressure fluid into contact with the lower surface of the said conveyor belt and upper surface of the said covering layer.
3. Apparatus according to Claim 2,
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. view to a larger scale on the section station A-A of Figure 1 and 2. An endless conveyor belt 1 of stainless steel or equivalent material of high thermal conductivity runs over end rollers 2 arranged at either end of a chamber 4, represented by thin lines in the drawings, which is substantially closed but has an opening 3 at either end. The forward run (in the drawing from right to left) of the belt 1, which carries the unwrapped products X, passes through the chamber 4 while the return run passes outside the chamber, as shown. Arranged within the chamber 4, over and under the belt 1, is a number of flushing nozzles 5 for fluid brought to a correct temperature and these are connected to a supply conduit 6 for fluid from a heat exchanger 7, in which the fluid will be given a predetermined temperature. A discharge or return conduit 8 is joined to the sloping bottom of the chamber 4 and via this conduit any liquid spurted out into the chamber is returned to the heat exchanger 7. A covering layer of thin, water-proof and flexible material is placed on the conveyor belt 1. In the embodiment of Figure 1 the covering layer consists of a web of film 9' which is unrolled from a roller 10, travels in parallel with the conveyor belt 1 and is rolled up on a roller 11. The film web may be of the disposable or reusable type. In the embodiment of Figure 2 the covering layer is in the form of an endless band 9" passing over end rollers 12. As is clearly apparent from Figure 3, the covering layer 9', 9" is wider than the conveyor belt 1 so that the covering layer may hang down at the edges of the conveyor belt and also closely follow the surfaces exposed above the belt 1 of the products X. To prevent brine, meat-juice or like subst ances. from flowing over the belt edges said belt is provided with raised edges 13, suitably in the form of rubber or like beads vulcanized thereon. As the fluid via the nozzles 5 situated over the belt will be supplied under pressure the covering layer 9',9" will be pressed down against the top side and edge surfaces of the produces X, which gives a large contact surface for the fluid and good heat transfer. With the apparatus of the invention the products X will be entirely covered by the covering layer which under the influence of the fluid supplied closely follows the configuration of the products. Due to the insignificant thickness of the material of the covering layer the heat transfer between the fluid and the product, and inversely, is not prevented to any provable extent. Since large quantities of fluid can be supplied, deep frozen products can be thawed in a considerably shorter time than that possible with previously known methods, without any risk of leaching or dissolution phenomena. Certain substances emanating from the products are retained on the belt and cannot mix with the heat treatment fluid, these can be allowed to circulate and recycled. The consumption of fluid, which represents a not insignificant cost item, can thus be kept on an acceptable level. The illustrated apparatus is primarily intended for use in thawing deep-frozen products but it is obvious that it may just as well be utilised for cooling and/or freezing of products. The fluid generally used in water. WHAT WE CLAIM IS:
1. A method for heat treatment of unwrapped products, especially food products, by means of a fluid, especially a liquid which has a temperature different from that of the products and is caused to supply heat to the product or remove heat therefrom, comprising the following steps:- placing the products on a support in the form of a conveyor belt or like means of high thermal conductivity; covering the products with a thin film web material forming a fluid-tight and flexible covering layer that is movable in parallel with the conveyor belt and has a width greater than that of the products resting on the support; flushing the underside of the support with fluid of a temperature different from that of the products while flushing under pressure also the top side of the covering layer with such a fluid, said covering layer being caused by said flushing closely to follow the surfaces exposed above the belt of the products and adjacent portions of the support under the influence of the mass and movement of the fluid, so as to maximize the area over which heat exchange with the fluid takes place, at the same time as the covering layer prevents the fluid from coming into contact with the product.
2. Apparatus for carrying out the method of Claim 1, comprising in combination a conveyor belt formed of material of high thermal conductivity accessible for flushing with fluid from below, a thin film web material forming a fluid-tight and flexible covering layer that is placed above said conveyor belt, covering said products and is movable in parallel therewith and has a width greater than that of the products resting on the conveyor belt to enable it under flushing conditions closely to follow the surfaces exposed above the belt of the said products to hang down at the edges of the conveyor belt and means for passing under pressure fluid into contact with the lower surface of the said conveyor belt and upper surface of the said covering layer.
3. Apparatus according to Claim 2,
wherein the conveyor belt has raised edges in the form of beads or the like, and the width of the covering layer is greater than that of the conveyor belt so that the edge portions of the former hang down at the edges of the latter.
4. Apparatus according to Claim 2, wherein the film web material consists of an endless film web which is movable in parallel with the conveyor belt.
5. Apparatus according to Claim 2, wherein the film web is movable in parallel with the conveyor belt and is adapted to be unrolled from a supply reel arranged at one end of the conveyor belt and to be collected at the opposite end of the belt.
6. Apparatus according to Claim 2, wherein the part of the conveyor belt supporting the products to be heat reated and the covering layer extend through a chamber which, in addition to upwardly directed fluid nozzles situated below the conveyor belt, has generally downwardly directed nozzles, arranged above the conveyor belt and the covering layer placed on said belt, for flushing with fluid from above, and wherein the chamber is provided with means for collecting and returning spent fluid.
7. Apparatus constructed and adapted to operate substantially as herein described and shown in the figures of the accompanying drawings.
8. Unwrapped products whenever produced by the method of Claim 1.
GB508878A 1977-02-18 1978-02-08 Methods for the heat treatment of products and apparatus for carrying out the method Expired GB1595552A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7701856A SE424802B (en) 1977-02-18 1977-02-18 PROCEDURE FOR DEFINING DEEP-FURNISHED GOODS AND DEVICE FOR CARRYING OUT THE PROCEDURE

Publications (1)

Publication Number Publication Date
GB1595552A true GB1595552A (en) 1981-08-12

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ID=20330500

Family Applications (1)

Application Number Title Priority Date Filing Date
GB508878A Expired GB1595552A (en) 1977-02-18 1978-02-08 Methods for the heat treatment of products and apparatus for carrying out the method

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JP (1) JPS53103260A (en)
CA (1) CA1070131A (en)
DE (1) DE2805131A1 (en)
FR (1) FR2380744A1 (en)
GB (1) GB1595552A (en)
SE (1) SE424802B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2141813A (en) * 1983-05-21 1985-01-03 Star Refrigeration Cooling apparatus
WO1998049505A1 (en) * 1997-04-25 1998-11-05 Frigoscandia Equipment Ab Method and apparatus for surface freezing
US6148618A (en) * 1997-04-25 2000-11-21 Frigoscandia Equipment Ab Method and apparatus for surface freezing
GR1010247B (en) * 2021-07-28 2022-06-09 Ινοκατ Μηχανηματα Τροφικων Εταιρεια Περιορισμενης Ευθυνης, Fast cooling appliance for products

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US4479776A (en) * 1981-07-22 1984-10-30 Smith Donald P Thermal treatment of food products
JPS5655188A (en) * 1979-08-01 1981-05-15 Crepaco Method and apparatus for defreezing frozen article
DE2952544A1 (en) * 1979-12-28 1981-07-30 Société des Produits Nestlé S.A., Vevey DEVICE FOR TREATING A FOOD
JPS5960166A (en) * 1982-09-27 1984-04-06 三菱電機株式会社 Freezer
JPS59109158A (en) * 1982-12-15 1984-06-23 House Food Ind Co Ltd Apparatus for continuous drying of food
JPS59161666A (en) * 1983-03-04 1984-09-12 三菱電機株式会社 Catalytic type continuous freezer
JPS6183853A (en) * 1984-10-01 1986-04-28 日新興業株式会社 Method and device for cargo-handling article to be refrigerated of refrigerator
JPS6354571A (en) * 1986-08-22 1988-03-08 トキワ工業株式会社 Continuous treater for refrigeration treatment, etc. of article
JPS63259366A (en) * 1987-04-14 1988-10-26 株式会社　前川製作所 Method of promoting heat transfer such as refrigeration, heating, drying or the like by jet air current
DE3930934A1 (en) * 1988-11-18 1990-05-23 Waldner Gmbh & Co Hermann Processing small size fruits by defrosting in container - also used for thermal sterilisation and cooling to packaging temp.
JPH02104266A (en) * 1989-07-28 1990-04-17 Mitsubishi Electric Corp Freezing method and apparatus therefor
FR2744884B3 (en) * 1996-02-20 1998-03-20 Dew Roger PRE-COOLING DEVICE FOR TUNNEL FOR FREEZING FOOD PRODUCTS AND PRODUCTS THUS OBTAINED
JP5021587B2 (en) * 2008-08-18 2012-09-12 株式会社東洋製作所 Continuous cooling / freezing equipment
JP6078227B2 (en) * 2011-10-17 2017-02-08 大陽日酸株式会社 Quick freezing apparatus and quick freezing method

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US1773081A (en) * 1927-06-18 1930-08-12 Frosted Foods Co Inc Refrigerating apparatus
GB336632A (en) * 1929-02-06 1930-10-16 Gen Foods Company Improvements in apparatus for freezing or chilling comestibles
FR675717A (en) * 1929-02-06 1930-02-13 Gen Foods Company Improvements to refrigeration devices
GB336634A (en) * 1929-02-06 1930-10-16 Gen Foods Company Improvements in or relating to refrigerating apparatus for comestibles
US2014550A (en) * 1931-01-20 1935-09-17 Frosted Foods Co Inc Refrigerating apparatus
US1953520A (en) * 1931-05-06 1934-04-03 Vogt Instant Frcezers Inc Quick-freezing of comestibles
DE690554C (en) * 1937-02-21 1940-04-27 Linde Eismasch Ag Device for quick freezing of food u. like
GB546876A (en) * 1941-10-24 1942-08-04 Moritz Hirsch An improved process for quick cooling and quick freezing
US2324517A (en) * 1942-04-01 1943-07-20 David W King Apparatus for freezing foodstuffs
US3309835A (en) * 1964-01-23 1967-03-21 Diamond Int Corp Method and apparatus for producing packages with a heat-shrink film
FR1399872A (en) * 1964-06-10 1965-05-21 Device for continuously cooking, blanching or pasteurizing vegetables or fruit
GB1045870A (en) * 1964-11-09 1966-10-19 Fiskeridirektoratets Kjemisk T Improvements in or relating to the freezing of foodstuffs

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2141813A (en) * 1983-05-21 1985-01-03 Star Refrigeration Cooling apparatus
WO1998049505A1 (en) * 1997-04-25 1998-11-05 Frigoscandia Equipment Ab Method and apparatus for surface freezing
US6148618A (en) * 1997-04-25 2000-11-21 Frigoscandia Equipment Ab Method and apparatus for surface freezing
AU728000B2 (en) * 1997-04-25 2001-01-04 Frigoscandia Equipment Ab Method and apparatus for surface freezing
GR1010247B (en) * 2021-07-28 2022-06-09 Ινοκατ Μηχανηματα Τροφικων Εταιρεια Περιορισμενης Ευθυνης, Fast cooling appliance for products

Also Published As

Publication number Publication date
SE424802B (en) 1982-08-16
SE7701856L (en) 1978-08-19
JPS53103260A (en) 1978-09-08
DE2805131C2 (en) 1990-03-29
FR2380744A1 (en) 1978-09-15
JPS6132950B2 (en) 1986-07-30
DE2805131A1 (en) 1978-08-24
CA1070131A (en) 1980-01-22

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