EP1355116A1 - Trocknungsvorrichtung und Verfahren zur Trocknung - Google Patents

Trocknungsvorrichtung und Verfahren zur Trocknung Download PDF

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Publication number
EP1355116A1
EP1355116A1 EP03076136A EP03076136A EP1355116A1 EP 1355116 A1 EP1355116 A1 EP 1355116A1 EP 03076136 A EP03076136 A EP 03076136A EP 03076136 A EP03076136 A EP 03076136A EP 1355116 A1 EP1355116 A1 EP 1355116A1
Authority
EP
European Patent Office
Prior art keywords
products
drying
housing
foregoing
order
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.)
Withdrawn
Application number
EP03076136A
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English (en)
French (fr)
Inventor
Wilco Fauth
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.)
Food Technology Noord Oost Nederland BV
Original Assignee
Machinefabriek en Roestvrijstaalindustrie Noord-Oost Nederland BV
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 Machinefabriek en Roestvrijstaalindustrie Noord-Oost Nederland BV filed Critical Machinefabriek en Roestvrijstaalindustrie Noord-Oost Nederland BV
Publication of EP1355116A1 publication Critical patent/EP1355116A1/de
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • F26B17/045—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined the material on the belt being agitated, dispersed or turned over by mechanical means, e.g. by vibrating the belt, by fixed, rotating or oscillating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/08—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being arranged in a sinuous or zig-zag path

Definitions

  • the present invention relates to a drying apparatus for drying for instance vegetables, herbs and/or fruit in combination with a method for drying vegetables, herbs and/or fruit, and to vegetables, herbs and/or fruit which have been dried according to the above stated method.
  • vegetables, herbs and/or fruit are dried, after processing thereof, by means of hot air which is carried over the products.
  • This hot air serves both to dry the products and to discharge the evaporated water.
  • too short a shelf life is obtained to include fresh vegetables in for instance salads or other ready-to-eat, pre-cut fresh products.
  • the present invention has for its object to obviate the above stated problems and provides for this purpose a method for drying products such as vegetables, herbs and/or fruit, in combination with an apparatus for drying products such as vegetables, herbs and/or fruit, comprising:
  • Such an apparatus can dry products to a desired moistness, wherein a longer shelf life of the products is achieved, wherein the products look better than products dried according to the prior art, wherein an energy saving is achieved relative to prior art drying and wherein the products are not damaged, whereby the quality of the end products improves.
  • the apparatus comprises jolting means for shaking the products.
  • jolting means for shaking the products.
  • the transporting means comprise two or more, and preferably three conveyor belts for transporting the products.
  • the length of the apparatus is limited to a predetermined length by applying two or more conveyor belts.
  • the apparatus comprises cooling means for cooling the products with cool air, whereby the temperature of the products is reduced so that the shelf life of the products is improved and the nutrients remain stored therein.
  • the apparatus comprises first, second, third and fourth control means for controlling the fan means, the drying means, the transporting means and the cooling means respectively and which are coupled thereto in order to achieve, if possible, a rapid and energy-saving drying with a high quality of the products.
  • control means for controlling the fan means, the drying means, the transporting means and the cooling means respectively and which are coupled thereto in order to achieve, if possible, a rapid and energy-saving drying with a high quality of the products.
  • the components of the apparatus are embodied where possible in stainless steel for application thereof in the food industry.
  • the apparatus complies with strict standards for the food industry through the use of qualitatively high-grade materials such as stainless steel.
  • the drying means comprise so-called STIR (Selective Transformed Infra-Red) modules for emitting infrared radiation of a predetermined wavelength.
  • STIR Selective Transformed Infra-Red
  • the temperature of the infrared modules is limited to 180 - 270°C so as to minimize the thermal load on the products on the one hand and to improve the shelf life of the products on the other.
  • a sterilizing and cleaning drying of the products is obtained up to a residual moisture content of 0 - 4% during dehydration respectively a surface moistness of 0 - 2% during drying.
  • the present invention provides a method for drying food products such as vegetables, herbs and/or fruit, comprising the steps of:
  • products are dried to a desired moistness, wherein a longer shelf life of the products is achieved, wherein the products look better than products dried according to the prior art, wherein an energy saving is achieved relative to the prior art drying and wherein the products are not damaged, whereby the quality of the dried products improves.
  • a drying apparatus 1 (fig. 1) according to the present invention comprises a housing 2 inside which the drying process takes place.
  • the foodstuffs are introduced into the machine at 4 and carried further into machine 1 via conveyor belt 6, which is embodied in a blue colour so that the distinction between the foodstuffs and the components of the conveyor belt is clear.
  • In the housing is arranged a number of doors 8 which can be opened in order to slide infrared modules 10 in and out of the machine.
  • Infrared modules 10 take an elongate and flat form so that they can be readily arranged above conveyor belt 6.
  • a collecting screen 12 via which screen the food products drop off belt 6 and come to lie on a second conveyor belt 14 located thereunder.
  • This second conveyor belt 14 moves in an opposite direction so that the total length of machine 1 is reduced.
  • a plurality of conveyor belts each one moving in opposite direction to the conveyor belt located thereabove, can be arranged as desired to further reduce the length of drying apparatus 1.
  • infrared modules 10 are once again arranged as desired for emitting infrared radiation so as to evaporate water and dry the products.
  • the food products leave the drying apparatus 1 at 16 and are further transported therefrom for further processing.
  • fans 18, which blow air from outside the machine into the drying apparatus transversely of the direction of movement of the belt in order to cool the foodstuffs and also to discharge moist air.
  • Control boxes 20 are arranged on top of respectively adjacently of housing 2 of the machine to control the speed of jolting units 64,66, the speed of fans 18, the speed of conveyor belts 6, 14 and the energy of infrared modules 10.
  • a perspective rear view of drying apparatus 1 shows, in addition to the components already described above, the two motors 22 and 24 for driving conveyor belts 6 and 14 respectively. Further shown are two electric motors 26 for driving jolting units which are arranged under conveyor belts 6 and 14 for slight shaking of the products on the conveyor belts, which jolting units are elucidated below.
  • extractors On the top side of drying apparatus 1 are arranged extractors with discharge pipes 28 and 30 for extracting in the longitudinal direction of the apparatus moist air which is situated above the conveyor belts, this using fans which are not further shown.
  • the product temperature can be maintained at a predetermined value by controlling the extraction speed in the longitudinal direction.
  • An infrared module 10 (fig. 3) comprises ceramic elements 40 for a normal infrared (IR) respectively for STIR (Selective Transformed Infra-Red), through which run two or more electrically conducting filaments 42.
  • IR normal infrared
  • STIR Selective Transformed Infra-Red
  • the radiation range respectively wavelengths ⁇ predetermined by the ceramic herein remain substantially constant and correspond as far as possible with the absorption capacity (oscillation characteristic) of the water molecules. In this manner the water can be removed more efficiently from biological products during drying at lower temperatures than during drying with convection heat as according to the prior art.
  • a carrier is arranged round filaments 42, preferably a cylindrical tube of ceramic material.
  • another ceramic layer is arranged round the carrier in order to achieve a higher efficiency.
  • Characteristics of the described Selective Transformed Infra-Red element are a high emission number ⁇ and an emission spectrum ⁇ which is readily absorbed by water.
  • the IR power P which can be generated with elements 40 lies in the range of about 1.25 - 25 kW/m 2 .
  • Elements 40 are arranged in a holder 44 with wiring 46 at outer ends thereof for supplying electric power.
  • the reflector 48 of an effectively specular metal such as high-grade steel, which is polished on the surface or the surface of which is gilded. Reflector 48 ensures that IR radiation reaches the products for drying not only directly but also via reflector 48.
  • a protective grid 50 of stainless steel On the visible side of elements 40 is also arranged a protective grid 50 of stainless steel.
  • the whole unit of reflector 48, IR elements 40 and protective grid 50 is arranged in a stainless steel protective hood 52. This latter has an elongate, flat form so that this can slide easily in and out of drying apparatus 1 (fig. 1).
  • the components shown in fig. 3 are arranged in protective hood 52 by glueing, welding or clicking and not used are rivets, pins or screws or other fixing techniques which contaminate easily.
  • the drying unit 10 is constructed such that it can be washed with cleaning methods usual in the food industry using acids, bases and mechanical cleaning means which comply with the hygienic requirements of the food processing industry.
  • a jolting unit consists of a central shaft 62 on opposite sides of which two eccentric shafts 64 and 66 are arranged.
  • shaft 62 rotates, the eccentric shafts 64, 66 alternately make contact with belt 6, whereby this latter is lifted in the order of 10 - 100 mm in order to shake the products 60.
  • the rotation frequency of shaft 62 can be controlled subject to the desired drying and product 60.
  • one or more jolting units with the two shafts 64 and 66 rotating round shaft 62 can be successively arranged.
  • Shafts 62 are driven by an electric motor 26. The power thereof is distributed over the central shafts 62 via transmission mechanism 68.
  • the shafts 62 are mounted in bearing 70.
  • a practical embodiment of drying apparatus 1 comprises 1 - 4 jolting units per metre, wherein the amplitude of the jolting unit is 10 - 100 mm, whereby the foodstuffs are moved in vertical direction in a range of 10 - 200 mm.
  • the jolting unit frequency lies in the range of 0.1 - 10 Hz.
  • the layer thickness of the foodstuff placed on conveyor belt 6 lies in the range of 0 - 200 mm.
  • the intensity of the infrared heat generated by the IR modules lies in the range of 0 - 20 kW/m 2 .
  • the intensity of the aeration via fans 18 and the deaeration via pipes 28 can be controlled, wherein the aeration temperature lies in the range of 0 - 40°C and the moistness of the blown-in air lies in the range of dry to moist air.
  • the drying duration can also be varied from for instance 2 - 120 min.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
EP03076136A 2002-04-19 2003-04-17 Trocknungsvorrichtung und Verfahren zur Trocknung Withdrawn EP1355116A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1020441A NL1020441C2 (nl) 2002-04-19 2002-04-19 Drooginrichting en werkwijze voor het drogen.
NL1020441 2002-04-19

Publications (1)

Publication Number Publication Date
EP1355116A1 true EP1355116A1 (de) 2003-10-22

Family

ID=28673132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03076136A Withdrawn EP1355116A1 (de) 2002-04-19 2003-04-17 Trocknungsvorrichtung und Verfahren zur Trocknung

Country Status (2)

Country Link
EP (1) EP1355116A1 (de)
NL (1) NL1020441C2 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004040198A3 (de) * 2002-10-30 2004-07-29 Ibt Infrabio Tech Gmbh Infrarotstrahler zur thermischen behandlung von gütern, nämlich baukörpern, bauelementen und baustoffen
DE102008008952A1 (de) 2008-02-13 2009-08-20 Biopro Ag Biological Products Verfahren zur Herstellung von Trockenprodukten und Anordnung zur Durchführung des Verfahrens
CN101690607B (zh) * 2009-09-03 2011-05-18 陆文光 脱水蔬菜连续干燥机
ITUA20163805A1 (it) * 2016-05-25 2017-11-25 Panghea Natural And Chemical Innovation S P A Apparecchiatura e metodo per il trattamento termico di materiale di origine vegetale, e materiale di origine vegetale ottenuto mediante detto metodo di trattamento termico
CN116447856A (zh) * 2023-06-09 2023-07-18 盛胜电子科技(广州)有限公司 一种集装箱式煤炭低温烘干机及烘干方法

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2452983A (en) * 1941-12-29 1948-11-02 Dehydration Inc Process of desiccating food products
FR947650A (fr) * 1947-05-20 1949-07-07 Procedes Georges Seurin Soc D étuve à rayonnement infra-rouge
DE965117C (de) * 1941-12-10 1957-05-29 Gen Motors Corp Vorrichtung zur Trocknung feinkoerniger Materialien
US5634281A (en) * 1995-05-15 1997-06-03 Universal Drying Systems, Inc. Multi pass, continuous drying apparatus
EP0780650A1 (de) * 1995-12-21 1997-06-25 Pannevis B.V. Vorrichtung zum Filtrieren,Waschen und Trocknen von einer Feststoff-Flüssigkeitsmischung
NL1008932C1 (nl) * 1998-04-20 1999-10-21 Bijlsma Hercules B V Droger voor vochtige landbouwproducten en werkwijze voor het drogen.
WO2000042372A1 (en) * 1999-01-13 2000-07-20 Cat-Tec Industries, Inc. Agitated bed cooling, drying, or heating apparatus
DE20022157U1 (de) * 2000-11-10 2001-03-22 Advanced Photonics Tech Ag Anordnung zum Trocknen bzw. Kalzinieren eines Schüttgutes
EP1164344A1 (de) * 2000-06-14 2001-12-19 Turatti s.r.l. Vorrichtung zur kontinuierlichen Trocknung von Gemüse, insbesondere von Blattgemüse
DE10132535A1 (de) * 2000-07-22 2002-01-31 Gunnar Reinhardt Trocknungstec Trocknungsverfahren und Einrichtungen zur Verfahrensdurchführung

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965117C (de) * 1941-12-10 1957-05-29 Gen Motors Corp Vorrichtung zur Trocknung feinkoerniger Materialien
US2452983A (en) * 1941-12-29 1948-11-02 Dehydration Inc Process of desiccating food products
FR947650A (fr) * 1947-05-20 1949-07-07 Procedes Georges Seurin Soc D étuve à rayonnement infra-rouge
US5634281A (en) * 1995-05-15 1997-06-03 Universal Drying Systems, Inc. Multi pass, continuous drying apparatus
EP0780650A1 (de) * 1995-12-21 1997-06-25 Pannevis B.V. Vorrichtung zum Filtrieren,Waschen und Trocknen von einer Feststoff-Flüssigkeitsmischung
NL1008932C1 (nl) * 1998-04-20 1999-10-21 Bijlsma Hercules B V Droger voor vochtige landbouwproducten en werkwijze voor het drogen.
WO2000042372A1 (en) * 1999-01-13 2000-07-20 Cat-Tec Industries, Inc. Agitated bed cooling, drying, or heating apparatus
EP1164344A1 (de) * 2000-06-14 2001-12-19 Turatti s.r.l. Vorrichtung zur kontinuierlichen Trocknung von Gemüse, insbesondere von Blattgemüse
DE10132535A1 (de) * 2000-07-22 2002-01-31 Gunnar Reinhardt Trocknungstec Trocknungsverfahren und Einrichtungen zur Verfahrensdurchführung
DE20022157U1 (de) * 2000-11-10 2001-03-22 Advanced Photonics Tech Ag Anordnung zum Trocknen bzw. Kalzinieren eines Schüttgutes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004040198A3 (de) * 2002-10-30 2004-07-29 Ibt Infrabio Tech Gmbh Infrarotstrahler zur thermischen behandlung von gütern, nämlich baukörpern, bauelementen und baustoffen
DE102008008952A1 (de) 2008-02-13 2009-08-20 Biopro Ag Biological Products Verfahren zur Herstellung von Trockenprodukten und Anordnung zur Durchführung des Verfahrens
CN101690607B (zh) * 2009-09-03 2011-05-18 陆文光 脱水蔬菜连续干燥机
ITUA20163805A1 (it) * 2016-05-25 2017-11-25 Panghea Natural And Chemical Innovation S P A Apparecchiatura e metodo per il trattamento termico di materiale di origine vegetale, e materiale di origine vegetale ottenuto mediante detto metodo di trattamento termico
CN116447856A (zh) * 2023-06-09 2023-07-18 盛胜电子科技(广州)有限公司 一种集装箱式煤炭低温烘干机及烘干方法
CN116447856B (zh) * 2023-06-09 2024-05-07 盛胜电子科技(广州)有限公司 一种集装箱式煤炭低温烘干机及烘干方法

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