WO2011060933A1 - Indicateur de température pour l'affichage optique d'une température inférieure à la température ambiante - Google Patents

Indicateur de température pour l'affichage optique d'une température inférieure à la température ambiante Download PDF

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Publication number
WO2011060933A1
WO2011060933A1 PCT/EP2010/007010 EP2010007010W WO2011060933A1 WO 2011060933 A1 WO2011060933 A1 WO 2011060933A1 EP 2010007010 W EP2010007010 W EP 2010007010W WO 2011060933 A1 WO2011060933 A1 WO 2011060933A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
temperature indicator
indicator according
heat
film
Prior art date
Application number
PCT/EP2010/007010
Other languages
German (de)
English (en)
Inventor
Gernot Ludescher
Erhard Lengfeldner
Original Assignee
On Point Indicators Gmbh
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 On Point Indicators Gmbh filed Critical On Point Indicators Gmbh
Priority to EP10785342A priority Critical patent/EP2502039A1/fr
Publication of WO2011060933A1 publication Critical patent/WO2011060933A1/fr

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
    • G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance

Definitions

  • Temperature indicator for visual indication of a temperature below the
  • the invention relates to a device for the visual display of a temperature of a specimen below the room temperature with protection against the action of undesirable disturbance temperatures.
  • W0102168A1 an indicator of a transparent laminate with one or more color-changing thermochromic materials is described.
  • Layer structure has at least one substantially gas-impermeable or UV light-impermeable layer.
  • a disadvantage of the cited document, however, is that a UV filter layer is needed to protect the underlying thermochromatic layer against UV light.
  • a gas-tight encapsulation is needed to protect the temperature-sensitive layer against the action of gases.
  • the disadvantage is given that the temperature-indicating element is not covered by an insulation space and therefore a thermally conductive contact with the overlying layers is given.
  • This has the disadvantage that a temperature effect on one of the upper cover layers is introduced directly in the form of heat conduction to the temperature indicator, which therefore leads to a false indication.
  • This means that such a temperature indicator is not suitable when it comes to the fact that incorrect influences (disturbance temperatures), such. B. an external heat radiation, a warming light radiation or the like should not lead to a false report.
  • CONFIRMATION COPY or comes from the outside, be registered directly on the heat-conducting cover layers on the temperature indicator, which therefore leads to a false report.
  • WO9924799A1 discloses a device for detecting the thawing of frozen food, wherein released liquid water is checked during thawing.
  • the device consists of a laminated layer composite, wherein at least one permeable layer, preferably paper, is used, and the indicator material provides water for the color change when a predetermined temperature is exceeded.
  • the temperature indicator is not suitable for displaying an unwanted indication of a temperature change that is not originated by the DUT.
  • the invention is therefore compared to this document, the object to provide a temperature indicator for displaying a temperature of a specimen below the room temperature, which does not lead to a false reading when exposed to outside higher temperatures and therefore only indicates a temperature of the DUT itself is generated, on which the temperature indicator is attached. External heat radiation or temperature influences should not lead to a false indication of the temperature indicator.
  • a feature of the invention is therefore that an external external influence, which does not come from the device under test itself, does not lead to a false indication of the temperature indicator.
  • the present description distinguishes between a disturbing temperature acting on the indicator from the outside and opposite the surface of the specimen, which should not lead to a false indication of the indicator and a measuring or detection temperature of a specimen to act on the temperature indicator without interference by the disturbance temperature .
  • An essential feature of the invention is therefore that the surface to be detected is connected directly or via good heat-conducting layers with the temperature or temperature to be detected layer or substrate and that on the, the layer or the substrate side facing away from an insulating layer is arranged in the form of a heat insulator which prevents the action of a disturbing heat (unwanted heat, leading to the false indication of the indicator) on the temperature indicator.
  • the heat insulator is formed as an air cavity, which is filled with a heat-insulating gas or a good heat-insulating liquid or solid substance.
  • a laminate with at least one color-changing material and an overlying, at least partially transparent layer or at least partially transparent film is used.
  • This layer need not be gas impermeable, but only a spacing to the color changing material needs to be achieved, and this layer must also be UV transparent.
  • the invention describes a temperature indicator whose structure delays the temperature difference between a substrate and the ambient temperatures such that an underlying temperature-sensitive layer preferably reacts to the substrate temperature without the influence of the ambient temperature.
  • Temperature-sensitive layers especially when they move below room temperature, have the disadvantage that the temperature is manipulated by external influences in such a way that it is no longer possible to detect the real object temperature. Likewise, heat is applied in the short term during physical contact or other heat sources, so that a falsified measurement result is achieved.
  • the indicator substance is arranged in a recess which faces away from the test object, wherein the recess provides a shelter, which is formed as poor as possible thermally conductive. For this reason, it is preferred if the recess is filled with a sealing gas or air or vacuum, so that this medium, which is to prevent the heat transfer from the recess to the indicator substance, is held as possible sealing in this recess.
  • a good and effective heat transfer from the test specimen to the indicator substance is achieved from one side, and from the opposite side a heat transfer to the indicator substance is to be prevented.
  • the recess is filled with a poorly heat-conductive material, in particular a gas or air or even a vacuum or other, optically at least semi-permeable material, such.
  • a heat-insulating gel a heat-insulating liquid or heat-insulating solids.
  • Such heat-insulating hollow body are preferably formed as (heat insulating trained) glass bubbles, which fill the recess.
  • the height of the recess is to be optimized in relation to the thickness of the indicator substance. It is to be achieved that the insulating cavity surrounds the indicator substance from the side facing away from the test object in order to achieve good thermal insulation there. Accordingly, it is not necessary for the solution that the recess is rectangular in profile. It can also be arcuate.
  • the wall boundary of the recess may also be formed in the form of a protective cap, which is sealingly mounted on the surface of the specimen and below which the indicator substance is applied directly to the specimen.
  • the invention assumes that the temperature of the test object or of the test object surface is always lower than the ambient temperature in which the test object is arranged. This means that the specimen is always colder than the ambient temperature and that the heat rays acting on the indicator away from the side facing away from the specimen should not lead to a false reading, but that only the lower temperature of the specimen is displayed correctly.
  • the indicator substance should always be from its nominal value below room temperature, i. H. are in direct thermal contact with the cooler DUT.
  • the invention accordingly relates to a device by which the temperature difference between a test specimen and ambient temperatures is delayed such that an underlying temperature-sensitive layer (irreversible) perceives it preferably only to the striglingstemperatur without influence of the ambient temperature, wherein the thermoreactive layer in fixed contact to the observing DUT is and is separated by an atmospheric protective layer to the environment.
  • the temperature-sensitive device reacts to fluctuating temperatures, wherein the indicator side faces the object to be measured and is covered or surrounded by a gaseous protective layer and is protected against unwanted thermal interference.
  • thermo-reactive substance has a thermal protection, which retards a thermal equilibrium between two different temperature poles.
  • Figure 1 schematically a section through a first embodiment of a
  • FIG. 2 the plan view of the temperature indicator according to FIG. 1
  • FIG. 4 shows an embodiment modified in comparison to FIG
  • FIG. 7 shows a fourth modification.
  • the schematic section through a device () is shown on the surface (9) of an object (0).
  • the surface (9) and the object (10) exemplify a container in the form of a bottle or a bag, or a box, or a package, or other temperature-sensitive test specimen, wherein the surface (9) the surface of a film or a molded article, and the object may be a liquid or a pasty substance or a food and the like.
  • the surface (9) can also be directly the surface of the object (10).
  • the temperature indicator (1) has a temperature-sensitive, irreversibly color-changing indicator substance (2).
  • the indicator substance (2) is applied on the surface of a carrier substrate film (5).
  • a carrier substrate film (5) is provided, for example and preferably, with an adhesive composite layer (8) and a non-adhesive protective film of non-stick-equipped plastic or paper with a spacer film (3).
  • the spacer film (3) can already have the recess (13) or the recess (13) is in each case only after the assembly the substrates (5, 3) produced by means of a band steel cutting tool or roller cutting tool or by laser or Schneidpiotter.
  • both elements (3, 4) can be manufactured from one part, for example by deep drawing or embossing or injection molding.
  • the air space (12) comes about and allows the longest possible decoupling of the outside temperature (15) from the object surface temperature (9).
  • This decoupling is to ensure that the indicator material (2) when touching the surface of the temperature indicator, for example with a finger, does not directly assume the finger temperature by thermal conduction.
  • this decoupling also applies to the transport of the object (10) with the device (1) through a space with a temperature above the activation temperature.
  • the air space (12) on the other side must be largely transparent, so that the color of the indicator material can be visually or automatically recognized depending on the state.
  • the atmospheric protective layer (12) delays the thermal equilibrium between the temperature of the object (10) and the object surface (9) and thus of the indicator material (2) and the ambient temperature (15), so that a brief increase in the ambient temperature (15) no change in color Episode has.
  • the spacer element (3) can be formed from a closed-cell or open-cell foam-like film of a few tenths of a thickness to about 5 mm in thickness, preferably 0.3 to 3 mm in thickness, and can have one or both sides Adhesive composite layer (6, 7) are performed.
  • Adhesive composite layer (6, 7) are performed.
  • the spacer member (3) may also be formed of a cardboard-like material or a composite laminate.
  • the spacer element (3) has to be provided with a covering layer (4) or covering film (4), and thereby the insulating air space (12) or the atmospheric protective layer (12) is produced above the indicator (2).
  • the cover layer (4) is made for example of a thin transparent plastic film of PET, PETG, oPP, PVC, PP, PMMA, PC, PE or a compound film of the plastics mentioned. Thicknesses of 9 ⁇ to 200 ⁇ , preferably 30 ⁇ to 100 ⁇ used.
  • the film (4) can be designed graphically and in color on the underside or the upper side, and thus instructions for the application of the device (1) can be realized graphically.
  • the indicator material (2) should in any case be in heat-conducting contact with the surface (9) of the object (10).
  • the substrate layer (5) or the substrate film (5) is very thin with about 9 ⁇ to about 150 ⁇ , in particular 30 ⁇ to 100 ⁇ and preferably selected from a thermoplastic and the adhesive layer (8) is only a few 1 ⁇ to 20 ⁇ Thickness.
  • the indicator material (2) can also be arranged on the underside of the substrate film (5) and the adhesive composite layer (8) can be arranged above or recessed. However, it must always be ensured that the indicator substance (2) remains visually recognizable.
  • thermally conductive material Polymethylmethyacrylat is used, which is filled with Leitruß.
  • metal powder filled PMMA can be used with metal powder filled PMMA.
  • the thermally conductive material can be prepared by melting a mixture of 10 to 20 wt .-% nickel and / or silver powder and the corresponding amount of PMMA powder.
  • electrically conductive plastic for example metal ions doped polyacetylene or polythiophene can be used as the conductive material.
  • Metals such as stainless steel, copper or metallized foil are used.
  • FIG. 3 shows an enlarged sectional representation through the situation according to FIG.
  • the air space or cavity should be filled as possible with a poorly heat-conductive material such. B. with an air, a noble gas, a protective gas or a vacuum. It is important that an incident in the direction of arrow 17 on the top of the temperature indicator heat radiation, the z. B. meets the top layer 4, only very much delayed and registered with low heat conduction efficiency according to arrow 18 in the cavity 12.
  • the cavity 12 is always cooled from the side of the specimen 9, 10 in the direction of arrow 19 with high thermal conductivity and high efficiency, so that the low temperature influence in the direction of arrow 18, which could lead to an increase in temperature in the interior of the air space 12, not up to Surface of the indicator substance 2 comes.
  • the indicator substance is in good heat-conducting contact with the surface of the object 10 and in poor heat-conducting contact with the environment of the object 10th
  • FIG. 4 shows, as a modified embodiment, that the recess 13 can also be delimited by a cap 15 on the wall side, which is formed from any heat-insulating material, such as, for example, As a heat-insulating plastic or a laminate, said cap 15 must be at least partially optically transparent to observe the color change of the indicator substance 2 from the outside.
  • a cap 15 on the wall side which is formed from any heat-insulating material, such as, for example, As a heat-insulating plastic or a laminate, said cap 15 must be at least partially optically transparent to observe the color change of the indicator substance 2 from the outside.
  • FIG. 5 shows, as a further exemplary embodiment, that it can be provided that a concave recess 16, in which the indicator substance 2 is formed, is arranged in the object surface 9.
  • the substrate layer 5 or substrate film can also be dispensed with, and according to the exemplary embodiment according to FIG. 5, the indicator substance 2 can be applied directly to the object surface 9.
  • FIG. 6 shows, as a further exemplary embodiment, that the heat-insulating structure according to FIG. 5 can also be omitted on the side of the indicator substance 2 facing away from the object surface and that the structure only consists of a cover layer 4 or of a cover film, but which nevertheless has a recess 13 with an air space 12 around the indicator substance 2 forms to complete this heat-insulating upwards, while down to take place in the direction of the object surface optimized heat transfer.
  • FIG. 7 shows, for all the exemplary embodiments mentioned, that the air space 12 in the recess 13 can also be designed as an insulator filling 21, wherein this insulator filling can be designed as a heat-insulating gel, liquid or solid.
  • the insulator filling 21 consists of hollow glass spheres 22, wherein each glass hollow sphere from about 5 prn to several 100 ⁇ diameter and also has thermally well insulated properties due to the hollow sphere property.
  • the temperature indicator can be made of a transparent blister or a deformable film or by injection molding. Drawing temperature indicator

Abstract

L'invention concerne un indicateur de température à changement de couleur thermochromique pour l'affichage optique d'une température d'un objet inférieure à la température ambiante, destiné à détecter la température de surface de cet objet, caractérisé en ce que la surface à détecter est reliée directement ou au moyen de couches ayant une bonne conductivité thermique à la surface dont la température doit être détectée, et en ce que le côté opposé à la surface comporte une couche d'isolation sous la forme d'un isolateur thermique empêchant l'action d'une source de chaleur parasite (action non souhaitée d'une source de chaleur entraînant une indication erronée de l'indicateur).
PCT/EP2010/007010 2009-11-19 2010-11-18 Indicateur de température pour l'affichage optique d'une température inférieure à la température ambiante WO2011060933A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10785342A EP2502039A1 (fr) 2009-11-19 2010-11-18 Indicateur de température pour l'affichage optique d'une température inférieure à la température ambiante

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009053927.1 2009-11-19
DE102009053927A DE102009053927A1 (de) 2009-11-19 2009-11-19 Temperaturindikator für die optische Anzeige einer Temperatur unterhalb der Raumtemperatur

Publications (1)

Publication Number Publication Date
WO2011060933A1 true WO2011060933A1 (fr) 2011-05-26

Family

ID=43608575

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/007010 WO2011060933A1 (fr) 2009-11-19 2010-11-18 Indicateur de température pour l'affichage optique d'une température inférieure à la température ambiante

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Country Link
EP (1) EP2502039A1 (fr)
DE (1) DE102009053927A1 (fr)
WO (1) WO2011060933A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10378970B2 (en) * 2015-02-24 2019-08-13 Prasidiux, Llc Thermochromic liquid crystal temperature indicator
DE202021106105U1 (de) 2021-11-09 2021-12-14 Feli-X GmbH Holding i.G. Kronkorken

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999024799A1 (fr) 1997-11-11 1999-05-20 Intec S.R.L. Dispositif permettant de detecter, d'evaluer et de signaler la decongelation de denrees alimentaires congelees et surgelees
WO2001002168A1 (fr) 1999-07-05 2001-01-11 Array Displays Ab Lamine transparent comprenant des materiaux pouvant changer de couleur, un filtre uv et une couche impermeable au gaz
US20030029373A1 (en) * 2001-08-10 2003-02-13 Isadore Cooperman Changed condition indicator
WO2004050506A1 (fr) * 2002-12-03 2004-06-17 Henry Norrby Emballage de stockage de produits aux fins de conservation, procede de marquage de l'emballage, et indicateur de temperature pour l'emballage
WO2010002168A2 (fr) 2008-07-01 2010-01-07 팅크웨어(주) Procédé et système de fourniture de services photographiques de surveillance de sécurité

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Publication number Priority date Publication date Assignee Title
FR2110505A5 (fr) * 1970-10-20 1972-06-02 Tricoire Jean
DE2617046A1 (de) * 1975-06-23 1977-01-20 Robert Dr Hill Einrichtung fuer die anzeige der thermischen vergangenheit eines produktes und verfahren zu seiner aktivierung
GB9002990D0 (en) * 1990-02-09 1990-04-04 Liquid Crystal Devices Ltd Liquid crystal thermometer
US6284078B1 (en) * 1994-11-22 2001-09-04 Medical Indicators, Inc. Method for preparing an improved liquid crystal clinical thermometer
DE19912529A1 (de) * 1999-03-19 2000-09-28 Nikolaus Vogels Vorrichtung zur Dokumentation einer Kühlkettenunterbrechung bei Kühl- bzw. Tiefkühlprodukten
DE202004020579U1 (de) * 2004-07-01 2005-10-13 Fissler Gmbh Gerät zum thermischen Behandeln von Gegenständen, Materialien oder Massen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999024799A1 (fr) 1997-11-11 1999-05-20 Intec S.R.L. Dispositif permettant de detecter, d'evaluer et de signaler la decongelation de denrees alimentaires congelees et surgelees
WO2001002168A1 (fr) 1999-07-05 2001-01-11 Array Displays Ab Lamine transparent comprenant des materiaux pouvant changer de couleur, un filtre uv et une couche impermeable au gaz
US20030029373A1 (en) * 2001-08-10 2003-02-13 Isadore Cooperman Changed condition indicator
WO2004050506A1 (fr) * 2002-12-03 2004-06-17 Henry Norrby Emballage de stockage de produits aux fins de conservation, procede de marquage de l'emballage, et indicateur de temperature pour l'emballage
WO2010002168A2 (fr) 2008-07-01 2010-01-07 팅크웨어(주) Procédé et système de fourniture de services photographiques de surveillance de sécurité

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Publication number Publication date
DE102009053927A1 (de) 2011-05-26
EP2502039A1 (fr) 2012-09-26

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