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EP1113728A1 - Dispositif et procede de conservation des aliments - Google Patents

Dispositif et procede de conservation des aliments

Info

Publication number
EP1113728A1
EP1113728A1 EP99946161A EP99946161A EP1113728A1 EP 1113728 A1 EP1113728 A1 EP 1113728A1 EP 99946161 A EP99946161 A EP 99946161A EP 99946161 A EP99946161 A EP 99946161A EP 1113728 A1 EP1113728 A1 EP 1113728A1
Authority
EP
European Patent Office
Prior art keywords
foods
magnetic field
concentration regions
conveying
concentrating
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Withdrawn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
EP99946161A
Other languages
German (de)
English (en)
Inventor
Hubertus Lelieveld
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.)
Unilever PLC
Unilever NV
Original Assignee
Unilever PLC
Unilever NV
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 Unilever PLC, Unilever NV filed Critical Unilever PLC
Priority to EP99946161A priority Critical patent/EP1113728A1/fr
Publication of EP1113728A1 publication Critical patent/EP1113728A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
    • A23B2/00—Preservation of foods or foodstuffs, in general
    • A23B2/60—Preservation of foods or foodstuffs, in general by treatment with electric currents without heating effect

Definitions

  • the invention relates to an apparatus for preserving foods, comprising generating means for generating a magnetic field.
  • Such an apparatus is known from U.S. Patent 4,424, 079.
  • the generating means are formed by a coil m which an oscillating magnetic field is generated which has a preservative effect on foods.
  • the magnetic field has a frequency between 5 and 500 kHz and an intensity between 2 and 100 T.
  • the generation of such an oscillating magnetic field requires a high-frequency alternating current of high amplitude, which must be generated by means of a suitably dimensioned oscillator- mtensifier combination.
  • Such an mtensifier is relatively expensive and has a high energy consumption.
  • the above frequencies and field intensities generate vigorous vibrations m the apparatus. To enable resistance to these vibrations, this known apparatus must be of mechanically very strong construction.
  • EP 434558 and US 4,065,386 disclose use of series or stacks of annular magnets for preventing or inhibiting growth of bacteria, algea, or protista m a fluid medium. Magnetic field strengths are up to 0.4 T (4000 gauss) .
  • an apparatus of the type mentioned m the opening paragraph is characterized according to the invention by concentrating means for locally concentrating the generated magnetic field m at least two concentration regions, and conveying means for conveying the foods through the concentration regions.
  • This can suitably be achieved by an apparatus (1) for preserving foods (2), comprising generating means (3) for generating a magnetic field, characterized by concentrating means (4) for locally concentrating the generated magnetic field m at least two concentration regions (5) and conveying means (6) for conveying the foods (2) through the concentration regions (5) , wherein the generating means (3) comprises a permanently magnetic body (7) or a magnetizable body (7), wherein said body (7) is not a closed, annular body.
  • the magnetic field generated by the generating means may then, in principle, be a static field, so that no oscillating magnetic field is required.
  • the "oscillation" of the field i.e. the intensity varying with time
  • the "oscillation" of the field is obtained by the movement of the articles to be preserved through a magnetic field with an intensity varying with place.
  • the generating means comprise at least one coil and one magnetizable body.
  • the magnetizable body which is made of, e.g., metal (iron) or a suitable ceramic type, guides the magnetic field generated by the coil and may also serve as concentrating means. It is possible, however, to design the apparatus such that the generating means comprise a permanently magnetic body. In that case, the coils may be omitted, if necessary, although it is possible to use a permanently magnetic body, optionally m combination with a coil.
  • the apparatus according to the invention is advantageously of such design that the concentrating means are formed by protruding elements of the body.
  • a suitable local concentration of the generated magnetic field can be readily achieved with concentrating means which are integral with the (magnetizable or permanently magnetic) body.
  • This can suitably be achieved by an apparatus (1) for preserving foods (2) , comprising generating means (3) for generating a magnetic field, characterized by concentrating means (4) for locally concentrating the generated magnetic field in at least two concentration regions (5) and conveying means (6) for conveying the foods (2) through the concentration regions (5), wherein the concentrating means (4) are formed by protruding elements, and wherein at least 4 protruding elements (4) in total are present.
  • the protruding elements (4) are an integral part with the body (7) .
  • the conveying means may comprise a conveyor belt which passes the foods through the concentration regions at a constant speed.
  • the conveying means may also be arranged to supply the articles such that they fall, while being decelerated or not, through the concentration regions at a constant speed (decelerated) or constantly increasing speed (not decelerated) .
  • Most preferred will be conveying means in the form of a tube or pipe containing a pu pable food product, such as plastic or fluid food product. Examples of such products are sauce, soup, juice, jam, dressings, mayonnaises, spreads, ice cream, tea, milk, coffee etcetera.
  • the invention further provides a process for preserving foods, comprising the generation of a magnetic field, which process is characterized, according to the invention, by locally concentrating the generated magnetic field in at least two concentration regions and conveying the foods through the concentration regions.
  • FIG. 1 diagrammatically shows, in top plan view, a first embodiment of an apparatus according to the invention
  • Fig. 2 diagrammatically shows, in top plan view, a second embodiment of an apparatus according to the invention
  • FIG. 3 diagrammatically shows, in side view, the apparatus of Fig. 2;
  • Fig. 4 diagrammatically shows, in more detail, the principle of the invention.
  • the embodiment of an apparatus 1 for preserving foods 2 which embodiment is diagrammatically shown in Fig. 1 and only by way of example, comprises generating means 3 for generating a magnetic field.
  • the generating means 3 are formed by the body (yoke) 7 of a substantially U-shaped permanent magnet.
  • the body 7 is provided with pairs of protruding elements 4 (e.g. "teeth"- like) , which form concentrating means for locally concentrating the generated magnetic field.
  • pairs of protruding elements 4 e.g. "teeth"- like
  • seven pairs of protruding elements 4 are present, each pair of opposite protruding elements forming a concentration region 5, as will be explained hereinafter with reference to Fig. 4. It will be clear that other numbers of pairs of protruding elements are also possible, e.g. five, ten, fifty or even hundred pairs of protruding elements.
  • the concentration regions (5 in Fig. 4) are in alignment, in accordance with the linear conveyance of the articles (foods) 6. It will be clear that a, for instance, arcuate arrangement of the concentration regions, preferably in combination with an arcuate conveyance of the foods 2, is also possible.
  • the conveying means 6 for conveying the foods 2 through the concentration regions 5 are formed by a conveyor belt.
  • other conveying means 6, such as a roller path or a train of containers may be used as well.
  • Most preferred will be conveying means in the form of a tube or pipe containing a pumpable food product, such as plastic or fluid food product. Examples of such products are sauce, soup, juice, jam, dressings, mayonnaises, spreads, ice cream, tea, milk, coffee etcetera.
  • the protruding elements 4 may be formed by providing in the body 7 such recesses as to yield the protruding elements.
  • the forming of the protruding elements (concentrating means) 4 and the body 7 in one piece has the advantage of yielding a simpler construction and a better magnetic guidance.
  • the apparatus 1 may comprise additional parts, which, however, are not shown in the figures, for clarity's sake.
  • additional protruding elements 4' of an additional body 7' are disposed transversely (or at any other angle) to the protruding elements 4 of the body 7, in a manner such that the additional protruding elements 4 ' are at right angles to the protruding elements 4 (i.e. perpendicular to the plane of the drawing) .
  • the additional protruding elements ' are always staggered with respect to the protruding elements 4. What is thus accomplished is that the concentration regions (5 in Fig.
  • the apparatus 1 of Fig. 2 is shown in Fig. 3 in side view.
  • the generating means 3 comprise, as shown, two magnet configurations each having a body (yoke) 7, 7' and a coil 8, 8' disposed round the respective body.
  • the concentrating means are formed by the ends (protruding elements 4, 4' in Fig. 2) of the bodies 7 and 7'. These ends enclose a concentration space 9 through which the articles (2 in Fig. 2) are conveyed.
  • the concentrating means (pairs of protruding elements 4), in each case, form a concentration region 5 of relatively high magnetic field intensity, while between the concentration regions 5 the magnetic field intensity is relatively low.
  • a passing article is subjected to a varying field intensity, the effect of which corresponds to an oscillating magnetic field.
  • the frequency of the apparent oscillations is determined by the conveying speed of the articles (or other form of food, e.g. liquid) and the mutual distances of the concentration regions.
  • the concentrating means are formed by protruding elements of a body (yoke) , with one or more coils disposed round the body. It is also possible, however, to form local concentration regions with a series of coils (e.g. arranged in parallel), which may or may not each be provided with a yoke, so that the concentrating means and the generating means may essentially coincide.
  • the concentration regions are preferably in a straight line to enable easy conveyance of the foods through these regions. It is also possible, however, to arrange the concentration regions in another configuration, e.g. in a circular arc. It is further possible that an article to be treated (foods etc.) does not traverse all the concentration regions.
  • the apparatus should be provided with cooling means for cooling the magnets.
  • the magnet coils are preferably made of a material which is permanently superconductive at a highest possible temperature.
  • the coils are alternately energized.
  • the foods may be conveyed through the apparatus according to the invention both in packed and in unpacked condition.
  • the foods may also be conveyed manually.
  • the apparatus such that the articles to be treated traverse the magnetic concentration regions while falling.
  • the conveying means are for supplying and discharging the articles and, consequently, only indirectly for the conveyance through the magnetic regions.
  • the falling may be decelerated (e.g. along an inclined surface, i.e. essentially sliding or rolling) or not be decelerated (in the free space).
  • the invention further encompasses a process for preserving foods (2), comprising the generation of a magnetic field, characterized by locally concentrating the generated magnetic field in at least two concentration regions (5) and conveying the foods (2) through the concentration regions (5) .
  • a process for preserving foods (2) comprising the generation of a magnetic field, characterized by locally concentrating the generated magnetic field in at least two concentration regions (5) and conveying the foods (2) through the concentration regions (5) .
  • such process is effected by usage of an apparatus as described herein.
  • the invention further encompasses foodstuffs, preserved according to the invention as disclosed herein.

Landscapes

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

Abstract

Dispositif (1) permettant de conserver les aliments (2), qui comprend des aimants (3, 7) destinés à générer un champ magnétique. Selon l'invention, le dispositif comprend un moyen de concentration (4), qui concentre localement le champ magnétique généré dans au moins deux zones de concentration (5), et un moyen de transport (6), qui transporte les aliments (2) de façon à leur faire traverser lesdites zones (5). Le dispositif permet de faire passer facilement les aliments dans un champ magnétique d'intensité variable et assure leur bonne conservation, le champ généré par les aimants (7) et/ou les enroulements (8) pouvant être statique.
EP99946161A 1998-09-14 1999-09-10 Dispositif et procede de conservation des aliments Withdrawn EP1113728A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99946161A EP1113728A1 (fr) 1998-09-14 1999-09-10 Dispositif et procede de conservation des aliments

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP98203063 1998-09-14
EP98203063 1998-09-14
PCT/EP1999/006727 WO2000015054A1 (fr) 1998-09-14 1999-09-10 Dispositif et procede de conservation des aliments
EP99946161A EP1113728A1 (fr) 1998-09-14 1999-09-10 Dispositif et procede de conservation des aliments

Publications (1)

Publication Number Publication Date
EP1113728A1 true EP1113728A1 (fr) 2001-07-11

Family

ID=8234108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99946161A Withdrawn EP1113728A1 (fr) 1998-09-14 1999-09-10 Dispositif et procede de conservation des aliments

Country Status (3)

Country Link
EP (1) EP1113728A1 (fr)
AU (1) AU5862399A (fr)
WO (1) WO2000015054A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1124449A2 (fr) * 1998-11-04 2001-08-22 Unilever N.V. Procede et appareil de conservation de produits alimentaires
ES2188495T3 (es) * 2000-03-03 2003-07-01 Barilla Alimentare Spa Metodo de desinfeccion de productos comestibles.
SG124314A1 (en) * 2005-02-01 2006-08-30 Esmo Technologies Pte Ltd Device and method for treating a perishable object
GB2524201B (en) * 2012-12-13 2017-07-26 Mars Inc Process for making confections
RU2676136C1 (ru) * 2018-03-27 2018-12-27 федеральное государственное бюджетное образовательное учреждение высшего образования "Ставропольский государственный аграрный университет" Устройство магнитной обработки клубней картофеля перед закладкой на хранение
KR102609896B1 (ko) * 2021-05-25 2023-12-04 최현확 식품 신선도 유지 장치 및 그 제어방법

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1467785A1 (de) * 1963-12-27 1968-12-12 Franz Baake Verfahren und Vorrichtung,um organische Substanzen laenger frisch zu halten-oder schneller in Gaerung zu versetzen
AU495329B2 (en) * 1975-12-10 1978-04-06 Robert Alexander Rigby Algae growth control
NZ231876A (en) * 1989-12-19 1993-02-25 Forrest Scient Research Ltd Fo Magnetic disinfection process and apparatus
WO1995009815A1 (fr) * 1993-10-06 1995-04-13 Water Recovery Plc Appareil a rayons u.v. pour traitement de fluide
US5925324A (en) * 1996-09-30 1999-07-20 Paradigm Technologies Magnetohydrodynamic sterilization method and apparatus
US5837303A (en) * 1997-04-07 1998-11-17 Mark Hayden Method for killing microorganisms in liquids

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0015054A1 *

Also Published As

Publication number Publication date
WO2000015054A1 (fr) 2000-03-23
AU5862399A (en) 2000-04-03

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