EP0886768A1 - Procede et indicateur de cycle gel-degel - Google Patents

Procede et indicateur de cycle gel-degel

Info

Publication number
EP0886768A1
EP0886768A1 EP97928418A EP97928418A EP0886768A1 EP 0886768 A1 EP0886768 A1 EP 0886768A1 EP 97928418 A EP97928418 A EP 97928418A EP 97928418 A EP97928418 A EP 97928418A EP 0886768 A1 EP0886768 A1 EP 0886768A1
Authority
EP
European Patent Office
Prior art keywords
microcapsule walls
indicator
freeze
undergone
color change
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Withdrawn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
EP97928418A
Other languages
German (de)
English (en)
Other versions
EP0886768A4 (fr
Inventor
Amiram Carmon
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0886768A1 publication Critical patent/EP0886768A1/fr
Publication of EP0886768A4 publication Critical patent/EP0886768A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/06—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using melting, freezing, or softening
    • 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
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/008—Alarm devices

Definitions

  • the present invention relates to a method for indicating whether an
  • An object of the present invention is to provide a simple, low cost, and
  • Another object of the invention is to provide an indicator for use in such method.
  • microcapsule walls enclosed within microcapsule walls, and a second material normally separated
  • the first material further including a liquid which, when frozen,
  • the liquid which expands when frozen is water. Also,
  • the indicator includes a rigid housing enclosing the first and second materials and
  • the color change substance in the second material is an
  • the first material provides a weak acid environment
  • freeze-thaw indicator for application to articles, particularly food articles to provide
  • Fig. 1 schematically illustrates one form of freeze-thaw indicator
  • Fig. 2a illustrates one of the microcapsules in the indicator of Fig. 1 in the normal condition of the capsules
  • Fig. 2b illustrates the microcapsule of Fig. 2a, but in its ruptured
  • Figs. 3a, 3b and 3c illustrate three phases in the operation of the
  • Fig. 4 schematically illustrates the indicator of Fig. 1 incorporated in a
  • Fig. 4a is an enlarged sectional view along IVa. Va of Fig. 4.
  • Fig. 4b illustrates a modification in the construction of Fig. 4a.
  • Fig 1 there is illustrated a freeze-thaw sequence
  • the first material 3 includes a liquid which,
  • freeze-thaw sequence Housing 6 enclosing the two materials 3 and 5 is rigid to
  • Fig 3b illustrates the microcapsule walls 4 enclosing the first material
  • microcapsule walls 4 causes the first material to expand and therefore to
  • FIG. 3c illustrates the condition wherein
  • Fig 4 illustrates the freeze-thaw sequence indicator 2 applied to a
  • packaged food article such as a fish or meat product
  • two color- change materials 3, 5, are normally colorless or transparent so that the
  • the rigid housing 11 containing the two materials 3, 5 the rigid housing 11 containing the two materials 3, 5
  • FIG. 4a illustrates another example wherein the
  • the color former substance of the second material 5 is a
  • the substance of the first (encapsulated) material 3 provides a weak acid environment and includes water which expands when frozen to rupture
  • Leucodyes is the name given to colorless chemical substances that
  • the encapsulated material is the water plus weak acid
  • a preferable weak acid environment for the encapsulated material is a water solution of citric acid or acetic acid
  • microcapsule walls In the present invention, the microcapsule walls are ruptured
  • the core liquid preferably water, which is expanded when frozen
  • Microencapsulation is a well established technology used in a variety of materials.
  • microcapsules are based on the polarity between the two immiscible phases, oil and water, which in turn enables the
  • microcapsule walls are of polyurea, and its structural features include the ability to
  • microcapsules flows into the surrounding continuous phase containing the
  • the continuous phase can be, for example, a solution of leucodyes in
  • organic solvents preferably an aromatic oil or ester containing benzene rings
  • a color former such as ones made and
  • the immiscible phase is composed of granules of citric acid
  • a preferred leucodye is one made by Hilton-Davis Corporation of
  • Water-loaded polyurea microcapsules were prepared by making use of
  • citric acid instead of citric acid, there may be also used acetic acid, or other weak
  • encapsulated microcapsules are prepared with cyclohexane in the water
  • immiscible phase is edible, but also the process allows placing microcapsules of
  • microcapsules with each batch containing microcapsules of the same size, but

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Abstract

La présente invention concerne un procédé permettant d'indiquer si un article alimentaire a subi une séquence gel-dégel, et consistant à appliquer sur l'article alimentaire un indicateur comportant un premier matériau (3) enfermé entre des parois en microcapsules (4) et un second matériau (5) séparé habituellement du premier matériau par lesdites parois en microcapsules. Les deux matériaux contiennent des substances qui, lorsqu'elles se rencontrent, produisent un changement de couleur, étant toutefois normalement séparées les unes des autres par les parois en microcapsules. Le premier matériau possède de surcroît un liquide, de l'eau de préférence qui, lorsqu'elle gèle se gonfle suffisamment pour rompre les parois en microcapsules (figure 26). De ce fait, lorsque le premier matériau a subi un cycle gel-dégel, il entre en contact avec le second matériau produisant ce changement de couleur indiquant que l'article alimentaire a fait l'objet d'une séquence gel-dégel.
EP97928418A 1996-07-11 1997-07-08 Procede et indicateur de cycle gel-degel Withdrawn EP0886768A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IL11884096 1996-07-11
IL11884096A IL118840A0 (en) 1996-07-11 1996-07-11 A colored indication for possible spoilage of frozen foods
PCT/IL1997/000229 WO1998002722A1 (fr) 1996-07-11 1997-07-08 Procede et indicateur de cycle gel-degel

Publications (2)

Publication Number Publication Date
EP0886768A1 true EP0886768A1 (fr) 1998-12-30
EP0886768A4 EP0886768A4 (fr) 1999-09-15

Family

ID=11069066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97928418A Withdrawn EP0886768A4 (fr) 1996-07-11 1997-07-08 Procede et indicateur de cycle gel-degel

Country Status (7)

Country Link
EP (1) EP0886768A4 (fr)
JP (1) JP2003519461A (fr)
AU (1) AU757162B2 (fr)
BR (1) BR9711806A (fr)
CA (1) CA2260184A1 (fr)
IL (1) IL118840A0 (fr)
WO (1) WO1998002722A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20000317U1 (de) * 2000-01-08 2001-06-07 Trender, Joachim, Dipl.-Kaufm., 56077 Koblenz Vorrichtung zur bleibenden, dauerhaften Detektion und Darstellung einer Über-/Unterschreitung einer fest vorgegebenen Temperatur
US6679070B1 (en) * 2002-08-29 2004-01-20 Winterlab Method for identifying thawed and refrozen products
DE102006045821A1 (de) * 2006-09-28 2008-04-03 Wötzer, Philipp Anzeigevorrichtung und Gefriergutverpackung
US8430053B2 (en) * 2010-09-30 2013-04-30 Temptime Corporation Color-changing emulsions for freeze indicators
RU2538450C1 (ru) * 2013-10-16 2015-01-10 Игорь Николаевич Кочергин Индикатор холода
JP2015159803A (ja) * 2014-02-28 2015-09-07 三菱レイヨン株式会社 冷凍品が解凍された回数を判別するための核酸及び該核酸を用いた冷凍品が解凍された回数を判別する方法
DE102016005075A1 (de) 2016-04-27 2017-11-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Temperaturüberwachung einer kryokonservierten biologischen Probe
DE102016005078A1 (de) 2016-04-27 2017-11-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zur Temperaturüberwachung einer kryokonservierten biologischen Probe
DE102016005133A1 (de) 2016-04-27 2017-11-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Temperaturüberwachung einer kryokonservierten biologischen Probe
DE102016005070A1 (de) 2016-04-27 2017-11-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zur Temperaturüberwachung einer kryokonservierten biologischen Probe
CN112396949A (zh) * 2019-08-13 2021-02-23 余丽 一种环境友好型低温保护失效提示标签的激活方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177843A (en) * 1964-02-13 1965-04-13 Robert S Geocaris Frozen food indicator
US3786777A (en) * 1970-12-31 1974-01-22 Artech Corp Irreversible warm-up indicator
US3888631A (en) * 1972-04-11 1975-06-10 Oskar Edwin Sturzinger Temperature indicator
US3844718A (en) * 1972-05-01 1974-10-29 H Cohen Frozen food defrosting indicator
US3967579A (en) * 1975-10-29 1976-07-06 Stanton H. Kaye Telltale device
US4022149A (en) * 1976-02-06 1977-05-10 Lee Berger Thaw indicator
US4145918A (en) * 1976-09-07 1979-03-27 Akzona Incorporated Freeze-thaw indicator
US4163427A (en) * 1977-12-05 1979-08-07 Isadore Cooperman Freeze-thaw indicator apparatus
US4327117A (en) * 1980-03-18 1982-04-27 Lenack Roger D Thaw indicator for frozen foods
GB8410548D0 (en) * 1984-04-25 1984-05-31 Ciba Geigy Ag Colourable assembly
US5325721A (en) * 1993-02-17 1994-07-05 Minnesota Mining And Manufacturing Company System for indicating exposure to preselected temperatures or tampering

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9802722A1 *

Also Published As

Publication number Publication date
EP0886768A4 (fr) 1999-09-15
CA2260184A1 (fr) 1998-01-22
AU757162B2 (en) 2003-02-06
IL118840A0 (en) 1996-10-31
JP2003519461A (ja) 2003-06-17
WO1998002722A1 (fr) 1998-01-22
AU3272197A (en) 1998-02-09
BR9711806A (pt) 1999-08-24

Similar Documents

Publication Publication Date Title
AU757162B2 (en) Method and indicator for indicating thawing
EP0250217B1 (fr) Dispositifs sensibles à la température
CA2362037C (fr) Indicateurs de suivi thermique
US4327117A (en) Thaw indicator for frozen foods
AU2002329716B2 (en) Changed condition indicator
US4163427A (en) Freeze-thaw indicator apparatus
US4022149A (en) Thaw indicator
DK1228366T3 (en) Full historical time-temperature indicator system
US3888631A (en) Temperature indicator
EP1560009A1 (fr) Dispositif d'affichage indiquant la temperature
US2971852A (en) Temperature telltale
AU2002329716A1 (en) Changed condition indicator
GB1212859A (en) Method and apparatus for indicating the condition of deep-freeze products, particularly foods
CN103210289A (zh) 下临界温度指示设备
US2716065A (en) Telltale for frozen food packages
EP2413118A1 (fr) Système indicateur de température-temps basé sur des changements de couleur irréversibles et procédé correspondant
JP2001500969A (ja) 食品を適切に加熱するための表示器およびその構築方法
GB2064768A (en) Device indicating excess temperature
EP2764339A2 (fr) Étiquette intelligente indiquant une température et procédé associé
JPH06504125A (ja) 液晶累積線量計用の改良容器
JPH01134219A (ja) 温度履歴検知材
JPS6118966B2 (fr)
GB2203244A (en) Indicator for monitoring the temperature of chilled or frozen products
JPS59122921A (ja) 解凍表示材
GB2108074A (en) Preservation and projection of active substances

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19981002

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

RAX Requested extension states of the european patent have changed

Free format text: LT PAYMENT 990127;LV PAYMENT 990127;SI PAYMENT 990127

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 19990804

AK Designated contracting states

Kind code of ref document: A4

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20050201