WO2010136217A1 - Food product heat treatment apparatus and method for heat treating food products - Google Patents

Food product heat treatment apparatus and method for heat treating food products Download PDF

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Publication number
WO2010136217A1
WO2010136217A1 PCT/EP2010/003279 EP2010003279W WO2010136217A1 WO 2010136217 A1 WO2010136217 A1 WO 2010136217A1 EP 2010003279 W EP2010003279 W EP 2010003279W WO 2010136217 A1 WO2010136217 A1 WO 2010136217A1
Authority
WO
WIPO (PCT)
Prior art keywords
food product
holding device
back pressure
heat treatment
treatment apparatus
Prior art date
Application number
PCT/EP2010/003279
Other languages
French (fr)
Inventor
Ole Poulsen
Wolfgang Schubert
Original Assignee
Spx Apv Danmark A/S
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 Spx Apv Danmark A/S filed Critical Spx Apv Danmark A/S
Priority to DK10722952.8T priority Critical patent/DK2434912T3/en
Priority to NZ596791A priority patent/NZ596791A/en
Priority to US13/322,919 priority patent/US9375022B2/en
Priority to EP10722952.8A priority patent/EP2434912B1/en
Priority to JP2012512260A priority patent/JP6097561B2/en
Priority to CN2010800302340A priority patent/CN102458161A/en
Publication of WO2010136217A1 publication Critical patent/WO2010136217A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C3/00—Preservation of milk or milk preparations
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C3/00—Preservation of milk or milk preparations
    • A23C3/02—Preservation of milk or milk preparations by heating
    • A23C3/03—Preservation of milk or milk preparations by heating the materials being loose unpacked
    • A23C3/031—Apparatus through which the material is transported non progressively; Temperature-maintaining holding tanks or vats with discontinuous filling or discharge
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C3/00—Preservation of milk or milk preparations
    • A23C3/02—Preservation of milk or milk preparations by heating
    • A23C3/03—Preservation of milk or milk preparations by heating the materials being loose unpacked
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C3/00—Preservation of milk or milk preparations
    • A23C3/02—Preservation of milk or milk preparations by heating
    • A23C3/03—Preservation of milk or milk preparations by heating the materials being loose unpacked
    • A23C3/033—Preservation of milk or milk preparations by heating the materials being loose unpacked and progressively transported through the apparatus
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C3/00—Preservation of milk or milk preparations
    • A23C3/02—Preservation of milk or milk preparations by heating
    • A23C3/03—Preservation of milk or milk preparations by heating the materials being loose unpacked
    • A23C3/033—Preservation of milk or milk preparations by heating the materials being loose unpacked and progressively transported through the apparatus
    • A23C3/0337—Preservation of milk or milk preparations by heating the materials being loose unpacked and progressively transported through the apparatus the milk flowing through with indirect heat exchange, containing rotating elements, e.g. for improving the heat exchange
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C3/00—Preservation of milk or milk preparations
    • A23C3/02—Preservation of milk or milk preparations by heating
    • A23C3/03—Preservation of milk or milk preparations by heating the materials being loose unpacked
    • A23C3/033—Preservation of milk or milk preparations by heating the materials being loose unpacked and progressively transported through the apparatus
    • A23C3/037—Preservation of milk or milk preparations by heating the materials being loose unpacked and progressively transported through the apparatus in direct contact with the heating medium, e.g. steam
    • 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
    • A23L3/001—Details of apparatus, e.g. for transport, for loading or unloading manipulation, pressure feed valves
    • 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
    • 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

Definitions

  • the present invention relates to a food product heat treatment apparatus in accordance with the preamble of claim 1 and a method for heat treating food products in accordance with the preamble of claim 12.
  • a food product heat treatment apparatus in accordance with the preamble of claim 1 is known from EP 0 794 706 Bl, wherein the whole contents thereof is incorporated into the present specification by reference.
  • a food product heat treatment apparatus for heat treatment of heat-sensitive fluid food products, such as whey protein concentrate, baby food and cheese milk, comprising an inlet for supplying the food product, an outlet for discharging the heat treated food product, a holding device downstream the inlet for holding the food product for a specific time at a specific temperature, and a back pressure device downstream the holding device, wherein the back pressure device (24) is a cooled valve, and/or wherein the holding device (23) is a positive displacement holding device and/or a timing device and/or a self cleaning holding device.
  • heat-sensitive fluid food products such as whey protein concentrate, baby food and cheese milk
  • the term cooled valve cannot be interpreted such that the valve is cooled by the heat treted food product passing the valve.
  • the term "cooled valve” is to be understood that the valve comprises means for externally cooling the valve.
  • a cool fluid can be passed through cooling channels provided in the cooled valve.
  • Other means for externally cooling the valve may be provided alternatively and/or in addition thereto.
  • the cooled valve can also be designated as cooling valve or externally cooled valve.
  • the cooled device can be designated as cooling device or externally cooled device.
  • Providing a back pressure device downstream the holding device has the advantage that a pressure drop across the holding device can be avoided or at least essentially be reduced because the pressure at the inlet of the holding device corresponds to the pressure at the outlet thereof. Therefore a slippage of food product through any small passages or gaps bypassing the normal way of travel through the holding device can essentially or almost completely or practically completely eliminated.
  • the holding time of food product bypassing the normal way of travel would be less than the holding time for food product passing the normal way of travel. If there is a considerable amount of food product bypassing the normally way of travel, there would be the need of extending the holding time for all food product in order to ensure that all food product is heat treated sufficiently. Therefore the holding time can be minimized in accordance with the embodiments of the invention because of the absence of a pressure difference across the holding device.
  • Cooling the back pressure device is preferred in order to cool down the food product at the time the food product is leaving the holding device after having been heat treated for the intended short time. There is the advantage that the cooled product will result into less problems with coating and sticking of heat treated food material onto the inner surface of the back pressure device.
  • the holding device is a lobe pump. Due to the positive displacement of the food product through the holding device the time the food product is heat treated in the holding device can be determined with a very high accuracy. In addition it is ensured that the complete food product needs to pass through the holding device because there is no bypass. Accordingly it is possible to minimize the holding time without the risk of an incomplete pasteurization.
  • the back pressure device can be a cooled back pressure device.
  • the cooled back pressure device can be any cooled device that generates a pressure drop, for instance a valve, a venturi tube, an orifice or equivalent means .
  • the holding device can be or comprise a lobe pump and/or a positive pump and/or a positive displacement pump.
  • the holding device can be or comprise a pipe.
  • the holding device can be or comprise a heat exchanger.
  • the heat exchanger can be a scraped surface heat exchanger, which can be or comprise a tubular heat exchanger.
  • the heat exchanger can have other shapes.
  • the holding device can be or comprise a screw transport pump.
  • the screw transport pump can be an extruder or equivalent means.
  • the back pressure device can be or comprise a valve.
  • the valve can be a back pressure valve.
  • the back pressure device can be or comprise a cooled valve.
  • the housing of the valve can be cooled and/or the valve cone can be cooled and/or the shaft of the valve can be cooled and/or the seat of the valve can be cooled.
  • the valve can be a back pressure valve.
  • the back pressure device can be or comprise a displacement pump device.
  • the back pressure device can be a positive displacement pump, for instance a gear pump.
  • the housing of the pump may be cooled.
  • the back pressure device can be directly downstream of the holding device and/or can be integrated in the holding device at the outlet of the holding device .
  • connection or pipe can be provided between the holding device and the back pressure device .
  • the food product heat treatment apparatus can further comprise an infusion heating device upstream of the holding device.
  • an infusion heating device into the holding device, preferably at the inlet thereof.
  • a back pressure device comprising a lobe pump having an integrated cooled valve at its outlet.
  • a method for heat treating a heat-sensitive fluid food product such as whey protein concentrate, baby food and cheese milk, comprising the following steps:
  • back pressure device is or comprises a cooled valve and/or the food product is positively displaced through the holding device.
  • the method of the invention has the advantage that a pressure drop in the holding device is essentially eliminated. Accordingly the holding time in the holding device can be minimized.
  • the back pressure device can be cooled. This has the advantage that sticking of processed food material at the inner surfaces can be further eliminated and preferably be avoided.
  • steam can be injected into the food product before and/or at the time of supplying the food product into holding device.
  • the method can be preformed with an apparatus in accordance with the invention as mentioned above.
  • Fig. 1 is a schematic diagram of a food product heat treatment apparatus in accordance with an embodiment of the invention.
  • Fig. 2 is a schematic diagram of a food product heat treatment apparatus in accordance with another embodiment of the invention.
  • Fig. 3 is a schematic diagram of a food product heat treatment apparatus in accordance with another embodiment of the invention.
  • Fig. 4 is a schematic diagram of a food product heat treatment apparatus in accordance with another embodiment of the invention.
  • Fig.l shows a schematic diagram of a food product heat treatment apparatus for heat treatment of heat-sensitive fluid food products, such as whey protein concentrate, baby food and cheese milk, in accordance with a first embodiment of the invention.
  • the food product heat treatment apparatus comprises a food product inlet 21 for supplying the food product into the food product heat treatment apparatus, a food product outlet 22 for discharging the heat treated food product, a holding device 23 downstream the food product inlet 21 for holding the food product for a specific time at a specific temperature, and a back pressure device 24 located downstream the holding device 23.
  • a cooling device 25 is provided to cool the back pressure device 24 such that a burning and scaling up of the heat treated food product is reduced and preferably avoided.
  • the cooling device comprises a cooling medium inlet 26 and a cooling medium outlet 27.
  • the holding device 23 is a positive displacement holding device and/or a timing device and/or a self cleaning holding device.
  • the holding device is a lobe pump.
  • the holding device 23 can also be or comprise a positive pump, a positive displacement pump of any kind known to the skilled person.
  • the holding device 23 can also be or comprise a pipe.
  • the holding device can be or comprise a heat exchanger to maintain a constant heat treating temperature in the holding device 23.
  • the holding device can also be or comprise a screw transport pump like an extruder. According to the invention any holding device can be used which provides a specific holding time of the food product in the holding device.
  • the back pressure device 24 is a cooled valve.
  • the cooling the valve can be provided as a cooling on the valve housing and/or on the valve cone and/or on the valve shaft.
  • Such cooled valves are known to the skilled person and its integration into for instance a lobe is within the skill and knowledge of the skilled person.
  • the back pressure device 24 can be any preferably cooled device that generates a pressure drop across the back pressure device such that a pressure drop across the holding device can be avoided and/or at least essentially reduced.
  • the back pressure device can be a valve, a venturi tube, an orifice or similar means like a tube having a section with a reduced diameter.
  • the back pressure device 24 can also be or comprise a positive displacement pump.
  • the back pressure device 24 is integrated in the holding device 23 at the outlet thereof.
  • the holding device 24 is a lobe pump and the back pressure device 24 is preferably a cooled valve.
  • Figs. 2 to 4 show schematic diagrams of alternative embodiments of the invention. Same or similar parts are designated with the same reference numerals. Reference is made to the description of the embodiments of Fig. 1. In the following only the differences to the embodiments of Fig. 1 are described.
  • the back pressure device 24 is not integrated into the holding device or immediately following the holding device but connected by connection means 29.
  • an instant infusion device is provided at the holding device 23.
  • hot steam is injected into the food product in order to instantaneously heating up the food product to the desired temperature the food product is to be held in the holding device for a specific time.
  • the embodiments according to the schematic diagram of Fig. 4 corresponds to the combination of the embodiments of Fig. 2 and Fig. 3, i.e. there are provided connection means 29 and the instant infusion heating device 30.
  • Any other heating means for heating up the food product can be used.
  • a heat exchanger can be used to heat the housing of the holding device.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Dairy Products (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • General Preparation And Processing Of Foods (AREA)

Abstract

The invention relates to a food product heat treatment apparatus for heat treatment of heat-sensitive fluid food products, such as whey protein concentrate, baby food and cheese milk, comprising an inlet (21) for supplying the food product, an outlet (22) for discharging the heat treated food product, a holding device (23) downstream the inlet (21) for holding the food product for a specific time at a specific temperature, and a back pressure device (24) downstream the holding device (23) wherein the holding device (23) is a positive displacement holding device and/or a self cleaning holding device. The invention also relates to a method for heat treating a heat-sensitive fluid food product, such as whey protein concentrate, baby food and cheese milk, comprising the following steps: (a) supplying the food product to an inlet (21), (b) heat treating the food product by holding the food product for a specific time at a specific temperature in a holding device (23), (c) providing a back pressure device (24) downstream the holding device (23), and (d) discharging the heat treated food product through an outlet (22), wherein the back pressure device (24) is or comprises a cooled valve and/or the food product is positively displaced through the holding device (23).

Description

Food product heat treatment apparatus and method for heat treating food products
The present invention relates to a food product heat treatment apparatus in accordance with the preamble of claim 1 and a method for heat treating food products in accordance with the preamble of claim 12.
A food product heat treatment apparatus in accordance with the preamble of claim 1 is known from EP 0 794 706 Bl, wherein the whole contents thereof is incorporated into the present specification by reference.
With the known apparatus it is possible to provide a high temperature treatment of the food product for a short time in order to pasteurize the food product. However there may be slight fluctuations of the time the food product is heat treated. Therefore the holding time needs to be extended slightly in order to ensure a sufficient pasteurisation.
Accordingly it is an object of the present invention to provide a food product heat treatment apparatus in accordance with the preamble of claim 1 wherein the holding time can be minimized.
The object of the invention is achieved by a food product heat treatment apparatus in accordance with the features of claim 1 and a method in accordance with the features of claim 12. Preferred embodiments of the invention are disclosed in the dependent claims .
In accordance with embodiments of the invention there is provided a food product heat treatment apparatus for heat treatment of heat-sensitive fluid food products, such as whey protein concentrate, baby food and cheese milk, comprising an inlet for supplying the food product, an outlet for discharging the heat treated food product, a holding device downstream the inlet for holding the food product for a specific time at a specific temperature, and a back pressure device downstream the holding device, wherein the back pressure device (24) is a cooled valve, and/or wherein the holding device (23) is a positive displacement holding device and/or a timing device and/or a self cleaning holding device.
Since the invention is directed to a food product heat treatment apparatus the term cooled valve cannot be interpreted such that the valve is cooled by the heat treted food product passing the valve. On the contrary the term "cooled valve" is to be understood that the valve comprises means for externally cooling the valve. For instance a cool fluid can be passed through cooling channels provided in the cooled valve. Other means for externally cooling the valve may be provided alternatively and/or in addition thereto. The same applies to other cooled devices the heat treated food product is passing through, i.e. such cooled devices are not cooled by the heat treated food product but by external cooling means. With other words, the cooled valve can also be designated as cooling valve or externally cooled valve. Similarly the cooled device can be designated as cooling device or externally cooled device.
Providing a back pressure device downstream the holding device has the advantage that a pressure drop across the holding device can be avoided or at least essentially be reduced because the pressure at the inlet of the holding device corresponds to the pressure at the outlet thereof. Therefore a slippage of food product through any small passages or gaps bypassing the normal way of travel through the holding device can essentially or almost completely or practically completely eliminated. The holding time of food product bypassing the normal way of travel would be less than the holding time for food product passing the normal way of travel. If there is a considerable amount of food product bypassing the normally way of travel, there would be the need of extending the holding time for all food product in order to ensure that all food product is heat treated sufficiently. Therefore the holding time can be minimized in accordance with the embodiments of the invention because of the absence of a pressure difference across the holding device.
Cooling the back pressure device is preferred in order to cool down the food product at the time the food product is leaving the holding device after having been heat treated for the intended short time. There is the advantage that the cooled product will result into less problems with coating and sticking of heat treated food material onto the inner surface of the back pressure device.
In accordance with the preferred embodiment the holding device is a lobe pump. Due to the positive displacement of the food product through the holding device the time the food product is heat treated in the holding device can be determined with a very high accuracy. In addition it is ensured that the complete food product needs to pass through the holding device because there is no bypass. Accordingly it is possible to minimize the holding time without the risk of an incomplete pasteurization.
In accordance with the invention the back pressure device can be a cooled back pressure device.
In accordance with the invention the cooled back pressure device can be any cooled device that generates a pressure drop, for instance a valve, a venturi tube, an orifice or equivalent means .
In accordance with the invention the holding device can be or comprise a lobe pump and/or a positive pump and/or a positive displacement pump.
In accordance with the invention the holding device can be or comprise a pipe.
In accordance with the invention the holding device can be or comprise a heat exchanger.
In accordance with the invention the heat exchanger can be a scraped surface heat exchanger, which can be or comprise a tubular heat exchanger. Alternatively the heat exchanger can have other shapes.
In accordance with the invention the holding device can be or comprise a screw transport pump.
In accordance with the invention the screw transport pump can be an extruder or equivalent means. In accordance with the invention the back pressure device can be or comprise a valve.
In accordance with the invention the valve, can be a back pressure valve.
In accordance with the invention the back pressure device can be or comprise a cooled valve.
In accordance with the invention the housing of the valve can be cooled and/or the valve cone can be cooled and/or the shaft of the valve can be cooled and/or the seat of the valve can be cooled.
In accordance with the invention the valve can be a back pressure valve.
In accordance with the invention the back pressure device can be or comprise a displacement pump device.
In accordance with the invention the back pressure device can be a positive displacement pump, for instance a gear pump. In accordance with the invention the housing of the pump may be cooled.
In accordance with the invention the back pressure device can be directly downstream of the holding device and/or can be integrated in the holding device at the outlet of the holding device .
In accordance with the invention a connection or pipe can be provided between the holding device and the back pressure device . In accordance with the invention the food product heat treatment apparatus can further comprise an infusion heating device upstream of the holding device.
In accordance with the invention it may be possible to integrate an infusion heating device into the holding device, preferably at the inlet thereof.
According to a preferred embodiment there is disclosed a back pressure device comprising a lobe pump having an integrated cooled valve at its outlet.
In accordance with the invention there is provided a method for heat treating a heat-sensitive fluid food product, such as whey protein concentrate, baby food and cheese milk, comprising the following steps:
(a) supplying the food product to an inlet (21),
(b) heat treating the food product by holding the food product for a specific time at a specific temperature in a holding device. ,
(c) providing a back pressure device downstream the holding device, and
(d) discharging the heat treated food product through an outlet (22),
wherein the back pressure device is or comprises a cooled valve and/or the food product is positively displaced through the holding device.
The method of the invention has the advantage that a pressure drop in the holding device is essentially eliminated. Accordingly the holding time in the holding device can be minimized.
In accordance with the invention the back pressure device can be cooled. This has the advantage that sticking of processed food material at the inner surfaces can be further eliminated and preferably be avoided.
In accordance with the invention steam can be injected into the food product before and/or at the time of supplying the food product into holding device.
In accordance with the invention the method can be preformed with an apparatus in accordance with the invention as mentioned above.
The invention will be explained in further detail with reference to the drawings, wherein the following reference numbers are used:
21 food product inlet
22 food product outlet
23 holding device
24 back pressure device
25 cooling device
26 cooling medium inlet
27 cooling medium outlet
28 process flow direction
29 connection means
30 infusion heating device
Preferred embodiments of the invention are shown in the attached drawings: Fig. 1 is a schematic diagram of a food product heat treatment apparatus in accordance with an embodiment of the invention.
Fig. 2 is a schematic diagram of a food product heat treatment apparatus in accordance with another embodiment of the invention.
Fig. 3 is a schematic diagram of a food product heat treatment apparatus in accordance with another embodiment of the invention.
Fig. 4 is a schematic diagram of a food product heat treatment apparatus in accordance with another embodiment of the invention.
Fig.l shows a schematic diagram of a food product heat treatment apparatus for heat treatment of heat-sensitive fluid food products, such as whey protein concentrate, baby food and cheese milk, in accordance with a first embodiment of the invention.
The food product heat treatment apparatus comprises a food product inlet 21 for supplying the food product into the food product heat treatment apparatus, a food product outlet 22 for discharging the heat treated food product, a holding device 23 downstream the food product inlet 21 for holding the food product for a specific time at a specific temperature, and a back pressure device 24 located downstream the holding device 23.
A cooling device 25 is provided to cool the back pressure device 24 such that a burning and scaling up of the heat treated food product is reduced and preferably avoided. The cooling device comprises a cooling medium inlet 26 and a cooling medium outlet 27.
The arrow at top of the Figures indicates the process flow direction 28.
The holding device 23 is a positive displacement holding device and/or a timing device and/or a self cleaning holding device.
Preferably the holding device is a lobe pump. The holding device 23 can also be or comprise a positive pump, a positive displacement pump of any kind known to the skilled person. The holding device 23 can also be or comprise a pipe. The holding device can be or comprise a heat exchanger to maintain a constant heat treating temperature in the holding device 23. The holding device can also be or comprise a screw transport pump like an extruder. According to the invention any holding device can be used which provides a specific holding time of the food product in the holding device.
Preferably the back pressure device 24 is a cooled valve. The cooling the valve can be provided as a cooling on the valve housing and/or on the valve cone and/or on the valve shaft. Such cooled valves are known to the skilled person and its integration into for instance a lobe is within the skill and knowledge of the skilled person.
According to the invention the back pressure device 24 can be any preferably cooled device that generates a pressure drop across the back pressure device such that a pressure drop across the holding device can be avoided and/or at least essentially reduced. For instance the back pressure device can be a valve, a venturi tube, an orifice or similar means like a tube having a section with a reduced diameter. The back pressure device 24 can also be or comprise a positive displacement pump.
According to the preferred embodiment the back pressure device 24 is integrated in the holding device 23 at the outlet thereof. Preferably the holding device 24 is a lobe pump and the back pressure device 24 is preferably a cooled valve.
Figs. 2 to 4 show schematic diagrams of alternative embodiments of the invention. Same or similar parts are designated with the same reference numerals. Reference is made to the description of the embodiments of Fig. 1. In the following only the differences to the embodiments of Fig. 1 are described.
In the embodiments according to the schematic diagram of Fig. 2 the back pressure device 24 is not integrated into the holding device or immediately following the holding device but connected by connection means 29.
In the embodiments according to the schematic diagram of Fig. 3, an instant infusion device is provided at the holding device 23. In the instant infusion device hot steam is injected into the food product in order to instantaneously heating up the food product to the desired temperature the food product is to be held in the holding device for a specific time. The embodiments according to the schematic diagram of Fig. 4 corresponds to the combination of the embodiments of Fig. 2 and Fig. 3, i.e. there are provided connection means 29 and the instant infusion heating device 30.
Any other heating means for heating up the food product can be used. For instance a heat exchanger can be used to heat the housing of the holding device.

Claims

Claims
1. Food product heat treatment apparatus for heat treatment of heat-sensitive fluid food products, such as whey protein concentrate, baby food and cheese milk, comprising
an inlet (21) for supplying the food product,
an outlet (22) for discharging the heat treated food product,
a holding device (23) downstream the inlet (21) for holding the food product for a specific time at a specific temperature, and
a back pressure device (24) downstream the holding device (23)
characterised in that the back pressure device (24) is a cooled valve, and/or in that the holding device (23) is a positive displacement holding device and/or a timing device and/or a self cleaning holding device.
2. Food product heat treatment apparatus according to claim 1, wherein the back pressure device (24) is cooled.
3. Food product heat treatment apparatus according to any of the preceding claims, wherein the holding device (23) is or comprises a lobe pump and/or a positive pump and/or a positive displacement pump.
4. Food product heat treatment apparatus according to any of the preceding claims, wherein the holding device (23) is or comprises a pipe.
5. Food product heat treatment apparatus according to any of the preceding claims, wherein the holding device is or comprises a heat exchanger.
6. Food product heat treatment apparatus according to any of the preceding claims, wherein the holding device (23) is or comprises a screw transport pump.
7. Food product heat treatment apparatus according to any of the preceding claims, wherein the back pressure device (24) is or comprises a valve.
8. Food product heat treatment apparatus according to any of the preceding claims, wherein the back pressure device (24) is or comprises a cooled valve.
9. Food product heat treatment apparatus according to any of the preceding claims, wherein the back pressure device (24) is or comprises a displacement pump device.
10. Food product heat treatment apparatus according to any of the preceding claims, wherein the back pressure device (24) is directly downstream of the holding device and/or integrated at the outlet of the holding device (23) .
11. Food product heat treatment apparatus according to any of the preceding claims further comprising an infusion heating device (30) upstream of the holding device (23).
12. Method for heat treating a heat-sensitive fluid food product, such as whey protein concentrate, baby food and cheese milk, comprising the following steps:
(a) supplying the food product to an inlet (21), (b) heat treating the food product by holding the food product for a specific time at a specific temperature in a holding device (23) ,
(c) providing a back pressure device (24) downstream the holding device (23) , and
(d) discharging the heat treated food product through an outlet (22),
characterised in that: the back pressure device (24) is or comprises a cooled valve and/or the food product is positively displaced through the holding device (23) .
13. Method according to claim 12, further comprising the step of cooling the back pressure device (24) .
14. Method according to claim 12 or 13, wherein steam is injected into the food product before and/or at the time of supplying the food product into holding device.
15. Method according to any of claims 12 to 14 preformed with an apparatus in accordance with any of claims 1 to 11.
PCT/EP2010/003279 2009-05-28 2010-05-28 Food product heat treatment apparatus and method for heat treating food products WO2010136217A1 (en)

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DK10722952.8T DK2434912T3 (en) 2009-05-28 2010-05-28 DEVICE FOR HEAT TREATMENT OF FOOD PRODUCTS AND PROCEDURE FOR HEAT TREATMENT OF FOOD PRODUCTS
NZ596791A NZ596791A (en) 2009-05-28 2010-05-28 Food product heat treatment apparatus and method for heat treating food products
US13/322,919 US9375022B2 (en) 2009-05-28 2010-05-28 Food product heat treatment apparatus and method for heat treating food products
EP10722952.8A EP2434912B1 (en) 2009-05-28 2010-05-28 Food product heat treatment apparatus and method for heat treating food products
JP2012512260A JP6097561B2 (en) 2009-05-28 2010-05-28 Food heat treatment apparatus and food heat treatment method
CN2010800302340A CN102458161A (en) 2009-05-28 2010-05-28 Food product heat treatment apparatus and method for heat treating food products

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EP09007154.9 2009-05-28
EP09007154A EP2255680A1 (en) 2009-05-28 2009-05-28 Food product heat treatment apparatus and method for heat treating food products

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US9615604B2 (en) 2014-02-06 2017-04-11 David Russick Food waste dehydrator

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NZ596791A (en) 2013-12-20
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US9375022B2 (en) 2016-06-28
EP2434912B1 (en) 2016-08-31
DK2434912T3 (en) 2017-01-02
EP2255680A1 (en) 2010-12-01
JP2012527869A (en) 2012-11-12
EP2434912A1 (en) 2012-04-04
CN106942370A (en) 2017-07-14
CN102458161A (en) 2012-05-16

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