WO2005104064A2 - Measurement of exposure to a control temperature - Google Patents

Measurement of exposure to a control temperature Download PDF

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Publication number
WO2005104064A2
WO2005104064A2 PCT/FR2005/050221 FR2005050221W WO2005104064A2 WO 2005104064 A2 WO2005104064 A2 WO 2005104064A2 FR 2005050221 W FR2005050221 W FR 2005050221W WO 2005104064 A2 WO2005104064 A2 WO 2005104064A2
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WO
WIPO (PCT)
Prior art keywords
porous strip
porous
reservoir
pusher
strip
Prior art date
Application number
PCT/FR2005/050221
Other languages
French (fr)
Other versions
WO2005104064A3 (en
Inventor
Galdino Barbieri
Original Assignee
Galdino Barbieri
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 Galdino Barbieri filed Critical Galdino Barbieri
Priority to EP05748678A priority Critical patent/EP1747436A2/en
Publication of WO2005104064A2 publication Critical patent/WO2005104064A2/en
Publication of WO2005104064A3 publication Critical patent/WO2005104064A3/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
    • G01K3/04—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values in respect of time

Definitions

  • the present invention relates to a device for detecting and quantitatively measuring the exposure of an object to a temperature control taking into account the duration of this exposure, consisting of an envelope comprising
  • the quantitative detection and measurement device is intended to monitor the passage of a control temperature which must not be exceeded or which must only be exceeded for a determined period, ie that is to say to detect the passage of this control temperature and, preferably also to measure the duration during which the device has remained above this control temperature.
  • a control temperature which must not be exceeded or which must only be exceeded for a determined period, ie that is to say to detect the passage of this control temperature and, preferably also to measure the duration during which the device has remained above this control temperature.
  • This device (FIG. 1 a) very schematically consists of an indicator surface 1 represented by a graduated scale or a graduation with patterns or drawings.
  • the indicator surface is covered by a strip of porous material 2, opaque or of very reduced transparency when it is not impregnated or wetted by the migrating material whereas, its parts impregnated with migrating material, are transparent and reveal the parts of the indicator surface located below.
  • the device also comprises a reservoir 3 containing a dose of migrating material 4. This material, which changes state or viscosity at the control temperature, is brought into contact with the porous strip 2. As soon as the detection device is at a temperature t greater than the control temperature te, the migrating material changes state and permeates the porous material 2 while progressing there as long as it remains in this state, that is to say as long as its temperature remains greater than the control temperature te.
  • the porous strip 2 constitutes a migration path and the impregnated part becomes transparent or at least translucent to reveal the corresponding part of the indicator surface.
  • the porous strip 2 is, where appropriate, covered by a cover 5 defining windows 51, 52 distributed along the migration path and revealing the porous strip which, in the initial state, opaque, hides the indicator surface below.
  • FIG. 1b shows the implementation of the detection device which, by assumption, has been exposed to a temperature t greater than the control temperature te. Under these conditions, the migrating material contained in the reservoir 3 has gradually impregnated the porous strip 2 and has propagated by capillary action at a determined speed, depending on the characteristics of the migrating material, the porous material and the temperature at which it is exposed.
  • the migrating material progresses in the porous strip but as soon as the temperature of the device drops below the control temperature, the migrating material changes state, freezes and progresses in the porous strip 2 is stopped.
  • the impregnated part 21 of the porous strip 2 is represented by a thick line.
  • the shaded graduations 11, 12, 13, 14 will thus be visible through the strip 2 in the windows 51, 52. According to the information to be provided by the detection and measurement device, all the migration path from the indicating surface is visible which allows to follow, continuously, the evolution of the migration path.
  • FIG. 2 schematically shows such a detection device and its envelope 6 or support which receives the various constituent elements, namely the indicator surface 1, the strip of porous material 2 and the reservoir 3 containing the dose of migrating material 4.
  • This envelope 6 is obviously transparent at least locally. The case if necessary, it can directly integrate the viewing windows (not shown).
  • the reservoir 3 containing the dose of migrating material 4 is placed at the initial end 20 of the porous strip 2 and of the indicator surface 1.
  • This indicator surface 1 and the porous strip 2 form the migration path represented here as a straight path .
  • the object of the present invention is to provide a device for detecting and quantitatively measuring the exposure of an object to a control temperature, of the above type, of simple manufacture, of setting in easy work allowing a wide distribution of the device for applications, in particular domestic ones like the control of the respect of the cold chain or the monitoring of the good functioning of a refrigerator. Description and advantages of the invention To this end, the present invention relates to a device for quantitative detection and measurement of the type defined above, characterized by
  • a pusher integrated into the wall of the envelope at least partially surrounding the porous strip, located at the level of the reservoir, and deforming between * a neutral, stable shape, not bringing into contact the irrigant material and the porous strip , and * an active, stable form, bringing the migrating material into contact with the porous strip, the irreversible deformation of the pusher between its neutral form and its active form being effected with effort.
  • integrating the means for triggering the operation of the device in the envelope of the device or a part of this envelope this facilitates manufacture by reducing the number of parts and automating the assembly.
  • This pusher which cannot pass from its neutral position or form to its position or active form that by a transformation of form requiring that one exerts a certain effort, there is generally no risk of being accidentally deformed and, consequently, d ; be rendered unusable.
  • the detector according to the invention can be stored, transported or shipped in good conditions without being brought to a particular temperature, that is to say it can be at room temperature, without the migrating material cannot be brought into contact with the porous strip and render the device unusable.
  • the device before being triggered, in order to avoid any erroneous recording, the device can first be put at low temperature, for example at the product storage temperature, before itself is triggered.
  • the pusher has a convex neutral shape and a concave active shape.
  • the reservoir containing the dose of migrating material can be produced in different ways.
  • the reservoir is a porous material soaked with a dose of migrating material
  • - the pusher is located to the right of the reservoir and the initial end of the porous strip
  • the pusher is in its active form, it presses the reservoir against the end of the porous strip to allow passage of the migrating material in the porous strip.
  • This embodiment of the device facilitates mass production and metering of the migrating material since reservoirs made of porous material soaked with migrating material can be produced separately from the assembly of the device, that is to say from the installation of the tank, pusher and indicator surface with the porous strip.
  • the reservoir is an enclosure containing a dose of migrating material, and placed at the right of the initial end of the porous strip, and the pusher provided with a point facing the enclosure, at the right of the latter.
  • the pusher pierces the enclosure of the migrating material to allow it to pass through the porous strip.
  • the device according to the invention is produced particularly simply in the form of a label comprising - a support layer provided with the indicating surface,
  • the device according to the invention can also be produced as a label allowing automatic detection of a temperature overshoot or an extended stay at an unauthorized temperature, the label comprising
  • the device in particular in the form of a label associated with a product, will prohibit the reading of the bar code or the interpretation of the bar code since this bar code will be deformed by the disturbing element appearing and simulating a barcode stroke.
  • the device according to the invention can be produced in large series in the form of pre-printed sheets constituting the support layer provided with indicator surfaces for each device, and receiving the porous strip, also distributed in the form of a pre-cut sheet and finally, an upper layer. covering the porous strip and the support layer to form the housing for the porous material pellet loaded with the dose of migrating material.
  • This tablet will be previously placed in the housings of the upper layer, the latter being for example shaped by thermoforming. After assembly, the strip is cut into labels. As the housing forming the reservoir or containing the pellet of porous material charged with the dose of migrating material remains away from the porous strip, whatever the physical state of the migrating material, as this is not in contact with the porous strip, there is no triggering of the device.
  • the manufacturing, assembly and cutting of the detector devices are operations which can be carried out entirely at ambient temperature whatever the control temperature.
  • it is not necessary to assemble the detection devices at a temperature below the control temperature which, for low control temperatures, such as those which must be observed in frozen products or products of this type, constitutes constraints which are particularly troublesome for industrial processes for mass production of inexpensive products.
  • this manufacturing can be done at room temperature, it is not necessary to install temperature-controlled enclosures and to make the manufacturing equipment work at very low temperatures; this considerably reduces the manufacturing cost and makes it possible to obtain detection devices at a cost favorable to their wide distribution.
  • FIG. 1 shows, in its parts a and b, a block diagram of a device detection and quantitative measurement of the exposure of an object to a control temperature according to the general principles of the prior art, showing in its part a, the device in neutral position and in its part b, the device after detection a temperature overshoot during a given period,
  • FIG. 2 is a view of the temperature detection device and its envelope, the assembly being in the neutral position
  • FIG. 3a-5b show schematically three embodiments of a device according to the invention by limiting the drawing to the main part of the device without showing the entire development of the migration path
  • Figure 3a shows a first mode for producing a quantitative detection and measurement device according to the invention in neutral position
  • FIG. 3b is a view similar to that of FIG. 3a, after triggering of the quantitative detection and measurement device
  • FIG. 4 shows analogously to FIGS. 3a, 3b, in its part a, an embodiment of the quantitative detection and measurement device in neutral position and, in its part b, the implementation of the device
  • FIG. 5 shows, in its parts a and b, as before, another embodiment of a device for detecting and quantitatively measuring the exposure of an object to a control temperature, in the neutral position in its part a and in the active position in its part b,
  • FIG. 6 is a sectional view of a detection and measurement device according to the invention, in the form of a label
  • FIG. 7 is a perspective view of another embodiment of a detection and measurement device in the form of a label bearing a bar code.
  • FIGS. 3a-5b show a detection and measurement device according to the invention, limited to the left part as it appears by example in Figure 2 corresponding to the initial end of the migration path without showing all of its development.
  • the device 100 comprises an envelope 106 receiving an indicating surface 101, shown here by a scale or graduations.
  • This surface 101 is covered on the visible side '(represented by an eye O) by a strip of porous material 102 initially opaque, the assembly thus defining the migration path.
  • a reservoir 103 containing a dose of migrating material 104 is placed near the porous strip 102 but initially not in contact with the latter.
  • a cover 105 is provided which releases a window 151 above the migration path.
  • the reservoir 103 containing the dose of migrating material 104 is placed above the initial end 120 of the migration path, that is to say above the corresponding end of the indicator surface 101 and of the porous strip 102.
  • the casing 106 comprises a pusher 107 of convex shape with respect to the outside when the pusher is in its neutral position (or shape) or inactive position shown in the Figure 3a. At this time, the pusher 107 does not activate the reservoir 103 and the latter is separated from the porous strip 102 so that the migrating material 104 remains confined in the reservoir 103 and cannot pass into the porous strip 102 and there migrate.
  • the push-button is actuated 107 to forcibly deform it and change it from its neutral form ( Figure 3a) to its active form 107a ( Figure 3b).
  • the pusher is retained in its neutral form by its shape resistance.
  • To pass it in its active form 107a it is necessary to exert a certain effort (arrow A) of deformation to pass the metastable position. This effort depends for example on the characteristics of the material or, more generally, on the mechanical characteristics of the pusher.
  • This transformation is irreversible, the pusher being deformed from one form to another passing through a form or a metastable state so that it is forced towards its active position and it is retained there.
  • the pusher 107a in the active position presses the reservoir 103 of the dose of migrating material 104 against the porous strip 102 so that, if the control temperature is exceeded, the migrating material 104 passes by capillary action in the porous strip 102 and impregnates it progressing there as a function of the temperature of the device and the duration during which the device is exposed to this temperature above the control temperature.
  • the impregnation of the porous strip 102 by the migrating material makes the porous strip transparent. This state is shown diagrammatically in FIG.
  • FIG. 4 shows a variant 200 of the device of the invention according to FIG. 3.
  • the porous strip 202 is not placed between the indicator surface 201 and the reservoir 203 at the level of the initial end of the path migration but above the tank 203, under the pusher 207 which is of the same nature as that of FIG. 3, integrated into the material of the envelope 206.
  • the porous strip In the neutral position (FIG. 4a), the porous strip is not in contact with the reservoir 203 containing the dose of migrating material 204 and the pusher has a convex shape with respect to the outside.
  • the pusher 207 is depressed as indicated in arrow A, by deforming the pusher with effort, it is passed into its shape or active position 207a, concave with respect to the outside.
  • FIG. 5 shows, in its parts a and b, another embodiment of the detection and measurement device 300 according to the invention.
  • the pusher 307 integrated in the casing 306 has a shape analogous to that described above: a convex shape, curved outward in the neutral position, stable and a concave shape facing the inside of the pregnant in active, stable position.
  • the transition from the neutral position to the active position is made by exerting a certain effort (arrow A).
  • the pusher 307 comprises a pin 308 which, in the neutral position, does not touch the reservoir 303 containing the dose of migrating material 304. In the active position, the pin 308 pierces the reservoir 303 thus allowing the migrating matter to pass through the porous strip 302 when the temperature conditions are established (temperature higher than the control temperature).
  • FIG. 6 shows in schematic section an embodiment in the form of a label of a quantitative detection and measurement device.
  • This label 400 shown in section, consists of a support surface 401 carrying, for example, the indicator surface in the form of a graduation.
  • This support surface 401 is covered with a strip of porous material 402 and the assembly is covered by an upper layer 406 forming the envelope.
  • This upper layer 406 is bonded or welded to the support surface 401.
  • the upper layer defines a boss 407 containing a pellet 403 forming a reservoir, impregnated with the dose of migrating material.
  • the end of this label 400 includes an orifice 410 for the passage of a fastener 411 represented by a circle, for example to fix the label to a product.
  • the support 401 can also be provided with an adhesive zone, for example with a double-sided adhesive covered on its external face with a peelable layer to allow the label 400 to be affixed to a product or object of which one wishes to control the temperature evolution.
  • the arrow A placed above the boss 407 indicates the triggering of the pressure detection device on the boss 407 to deform the boss 407 remanently and bring the pin 403 in contact with the porous strip 402 and trigger the operation of the detector.
  • the label 400 thus represented can be produced in large series and at room temperature, by the use of a tablecloth preprinted containing the indicative surfaces of the labels to be manufactured; strips of porous material are placed on this sheet, then the upper layer, preformed with housings previously provided with soaked pellets, is put in place. This upper layer is then sealed to the lower layer by trapping the porous strip and the pellets impregnated with doses of migrating material. Finally, the assembly is cut to give unit labels or batches of labels.
  • This manufacturing technique is very similar to printing techniques or techniques for manufacturing “blister” envelopes.
  • FIG. 7 shows, in perspective view, another form of detection and measurement label 500 according to the invention. This label has the structure of that of FIG.
  • the envelope covering 506 the migration path formed by the indicator surface covered by the strip of porous material 502 is opaque and only has a window 551 in one place. specific.
  • the top of the label has a bar code 510.
  • the indicator surface is provided with a print in the form of a bar code line, at window 551.
  • the line of the indicator surface does not appear through window 551 and the bar code 510 can be read normally. But if the label has exceeded the control temperature and the migrant has migrated into the strip of porous material up to the level of window 551, the strip which has become transparent reveals the bar code line in the window.
  • This bar code line is a disturbing element because it is added to the other lines of the bar code and makes it impossible to read the bar code.
  • This simple means makes it possible to automatically detect a label which may or may not have exceeded the control temperature for a fixed period. This duration can be very short depending on the migration path. This allows automatic removal of products that have exceeded the control temperature. In the case of the example of an automatic checkout, the barcode of the product cannot be read and the product will therefore be automatically rejected.

Abstract

The invention relates to a device for the detection and quantitative measurement of the exposure of an object to a control temperature, taking account of the duration of said exposure. The inventive device consists of a casing comprising an indicator surface (101) and a tank (103) containing a dose of migrating material (104). According to the invention, the migrating material (104) is contained in a tank (103) which is initially separated from the porous strip (102). In addition, a push element (107) is built into the wall of the casing (106) at the tank (103), said casing surrounding the porous strip (102) at least partially. The aforementioned push element deforms between a stable neutral position (107), in which the migrating material (104) is not brought into contact with the porous strip (107), and a stable active form (107a), in which the migrating material (104) is brought into contact with the porous strip (102), and the irreversible deformation of the push element (107) between the neutral form and the active form thereof occurs with force (A).

Description

« Dispositif de détection et de mesure quantitative de l'exposition d'un objet à une température de contrôle » Domaine de l'invention La présente invention concerne un dispositif de détection et de mesure quantitative de l'exposition d'un objet à une température de contrôle avec prise en compte de la durée de cette exposition, formé d'une enveloppe comprenant“Device for detecting and quantitatively measuring the exposure of an object to a control temperature” Field of the invention The present invention relates to a device for detecting and quantitatively measuring the exposure of an object to a temperature control taking into account the duration of this exposure, consisting of an envelope comprising
- une surface indicatrice, couverte du côté visible par une bande en une matière poreuse initiale- ment opaque formant un chemin de migration,- an indicator surface, covered on the visible side by a strip of initially opaque porous material forming a migration path,
- un réservoir contenant une dose de matière migrante changeant d'état à une température supérieure ou égale à la température de contrôle et se propageant alors par capillarité à une vitesse déterminée dans la bande poreuse pour la rendre transparente par imprégnation progres- sive pour laisser apparaître par transparence la surface indicatrice- a reservoir containing a dose of migrating material changing state at a temperature greater than or equal to the control temperature and then propagating by capillary action at a determined speed in the porous strip to make it transparent by progressive impregnation to reveal by transparency the indicator surface
Etat de la technique Le dispositif de détection et de mesure quantitative est destiné à surveiller le passage d*une température de contrôle que l'on ne doit pas dépasser ou qui ne doit être dépassée que pendant une durée déter- minée, c'est-à-dire détecter le passage de cette température de contrôle et, de préférence aussi mesurer la durée pendant laquelle le dispositif a séjourné au-dessus de cette température de contrôle. On connaît déjà un tel dispositif de détection et de mesure quantitative de l'exposition d'un objet à une température de contrôle. Ce dispositif (figure la) se compose très schématiquement d*une surface indicatrice 1 représentée par une échelle graduée ou une graduation avec des motifs ou des dessins. Du côté visible, la surface indicatrice est couverte par une bande de matière poreuse 2, opaque ou de transparence très réduite lorsqu'elle n'est pas imprégnée ou mouillée par la matière migrante alors que, ses parties imprégnées de matière migrante, sont transparentes et laissent apparaître les parties de la surface indicatrice situées en dessous. Le dispositif comprend également un réservoir 3 contenant une dose de matière migrante 4. Cette matière, qui change d'état ou de viscosité à la température de contrôle, est mise en contact avec la bande poreuse 2. Dès que le dispositif de détection est à une température t supérieure à la température de contrôle te, la matière migrante change d'état et imprègne la matière poreuse 2 en y progressant aussi longtemps qu'elle reste dans cet état, c'est-à-dire aussi longtemps que -sa température reste supérieure à la température de contrôle te. La bande poreuse 2 constitue un chemin de migration et la partie imprégnée devient transparente ou au moins translucide pour laisser apparaître la partie correspondante de la surface indicatrice. Pour simplifier la lecture, la bande poreuse 2 est, le cas échéant, couverte par un cache 5 définissant des fenêtres 51, 52 réparties le long du chemin de migration et laissant apparaître la bande poreuse qui, à l'état initial, opaque, cache la surface indicatrice se trouvant en dessous. La figure lb montre la mise en œuvre du dispositif de détection qui par hypothèse a été exposé à une température t supérieure à la température de contrôle te. Dans ces conditions, la matière migrante contenue dans le réservoir 3 a imprégné progressivement la bande poreuse 2 et s'est propagée par capillarité à une vitesse déterminée, dépendant des caractéristiques de la matière migrante, de la matière poreuse et de la température à laquelle elle est exposée. Lorsque la température atteint ou dépasse la température de contrôle, la matière migrante progresse dans la bande poreuse mais dès que la température du dispositif passe en dessous de la température de contrôle, la matière migrante change d'état, se fige et sa progression dans la bande poreuse 2 est arrêtée. La partie imprégnée 21 de la bande poreuse 2 est représentée par un trait épais. Les graduations ombrées 11, 12, 13, 14 seront ainsi visibles à travers la bande 2 dans les fenêtres 51, 52. Suivant l'information que doit fournir le dispositif de détection et de mesure, tout le chemin de migration de la surface indicatrice est visible ce qui permet de suivre, de façon continue, l'évolution du chemin de migration. Il est également possible de visualiser certains stades d'évolution de manière à rendre la détection ou la visualisation plus facile et plus simple ; ainsi la surface indicatrice comporte par exemple des zones de couleurs ou des pictogrammes au droit des fenêtres de visualisation pour souligner le degré d'évolution de la durée d'exposition. La figure 2 montre schématiquement un tel dispositif de détection et son enveloppe 6 ou support qui reçoit les différents éléments constitutifs, à savoir la surface indicatrice 1, la bande de matière poreuse 2 et le réservoir 3 contenant la dose de matière migrante 4. Cette enveloppe 6 est évidemment transparente au moins localement. Le cas échéant, elle peut intégrer directement les fenêtres de visualisation (non représenté). Le réservoir 3 contenant la dose de matière migrante 4 est placé au niveau de rextrémité initiale 20 de la bande poreuse 2 et de la surface indicatrice 1. Cette surface indicatrice 1 et la bande poreuse 2 forment le chemin de migration représenté ici comme un chemin droit. En fait, il peut également s'agir du développement d'un chemin enroulé en spirale ou en arc de cercle ou selon un autre tracé, par exemple en méandres sui- vant l'encombrement ou la compacité que peut ou doit présenter le dispositif de détection et de mesure. But de l'invention La présente invention a pour but de réaliser un dispositif de détection et de mesure quantitative de l'exposition d'un objet à une tempê- rature de contrôle, du type ci-dessus, de fabrication simple, de mise en œuvre facile permettant une large diffusion du dispositif pour des appE- cations, en particulier domestiques comme le contrôle du respect de la chaîne du froid ou la surveillance du bon fonctionnement d'un réfrigérateur. Exposé et avantages de l'invention A cet effet, la présente inventipn concerne un dispositif de détection et de mesure quantitative du type défini ci-dessus caractérisé parSTATE OF THE ART The quantitative detection and measurement device is intended to monitor the passage of a control temperature which must not be exceeded or which must only be exceeded for a determined period, ie that is to say to detect the passage of this control temperature and, preferably also to measure the duration during which the device has remained above this control temperature. Such a device for detecting and quantitatively measuring the exposure of an object to a control temperature is already known. This device (FIG. 1 a) very schematically consists of an indicator surface 1 represented by a graduated scale or a graduation with patterns or drawings. On the visible side, the indicator surface is covered by a strip of porous material 2, opaque or of very reduced transparency when it is not impregnated or wetted by the migrating material whereas, its parts impregnated with migrating material, are transparent and reveal the parts of the indicator surface located below. The device also comprises a reservoir 3 containing a dose of migrating material 4. This material, which changes state or viscosity at the control temperature, is brought into contact with the porous strip 2. As soon as the detection device is at a temperature t greater than the control temperature te, the migrating material changes state and permeates the porous material 2 while progressing there as long as it remains in this state, that is to say as long as its temperature remains greater than the control temperature te. The porous strip 2 constitutes a migration path and the impregnated part becomes transparent or at least translucent to reveal the corresponding part of the indicator surface. To simplify reading, the porous strip 2 is, where appropriate, covered by a cover 5 defining windows 51, 52 distributed along the migration path and revealing the porous strip which, in the initial state, opaque, hides the indicator surface below. FIG. 1b shows the implementation of the detection device which, by assumption, has been exposed to a temperature t greater than the control temperature te. Under these conditions, the migrating material contained in the reservoir 3 has gradually impregnated the porous strip 2 and has propagated by capillary action at a determined speed, depending on the characteristics of the migrating material, the porous material and the temperature at which it is exposed. When the temperature reaches or exceeds the control temperature, the migrating material progresses in the porous strip but as soon as the temperature of the device drops below the control temperature, the migrating material changes state, freezes and progresses in the porous strip 2 is stopped. The impregnated part 21 of the porous strip 2 is represented by a thick line. The shaded graduations 11, 12, 13, 14 will thus be visible through the strip 2 in the windows 51, 52. According to the information to be provided by the detection and measurement device, all the migration path from the indicating surface is visible which allows to follow, continuously, the evolution of the migration path. It is also possible to visualize certain stages of evolution so as to make detection or visualization easier and simpler; the indicator surface thus includes, for example, color zones or pictograms at the right of the viewing windows to underline the degree of evolution of the duration of exposure. FIG. 2 schematically shows such a detection device and its envelope 6 or support which receives the various constituent elements, namely the indicator surface 1, the strip of porous material 2 and the reservoir 3 containing the dose of migrating material 4. This envelope 6 is obviously transparent at least locally. The case if necessary, it can directly integrate the viewing windows (not shown). The reservoir 3 containing the dose of migrating material 4 is placed at the initial end 20 of the porous strip 2 and of the indicator surface 1. This indicator surface 1 and the porous strip 2 form the migration path represented here as a straight path . In fact, it may also be the development of a path wound in a spiral or in an arc of a circle or according to another layout, for example in meanders depending on the size or compactness that the device can or must have. detection and measurement. OBJECT OF THE INVENTION The object of the present invention is to provide a device for detecting and quantitatively measuring the exposure of an object to a control temperature, of the above type, of simple manufacture, of setting in easy work allowing a wide distribution of the device for applications, in particular domestic ones like the control of the respect of the cold chain or the monitoring of the good functioning of a refrigerator. Description and advantages of the invention To this end, the present invention relates to a device for quantitative detection and measurement of the type defined above, characterized by
- un réservoir contenant la matière migrante initialement séparé de la bande poreuse, et- a reservoir containing the migrating material initially separated from the porous strip, and
- un poussoir intégré à la paroi de l'enveloppe entourant au moins partiellement la bande poreuse, situé au niveau du réservoir, et se déformant entre * une forme neutre, stable, ne mettant pas en contact la matière i- grante et la bande poreuse, et * une forme active, stable, mettant en contact la matière migrante et la bande poreuse, la déformation irréversible du poussoir entre sa forme neutre et sa forme active se faisant avec effort. Comme le dispositif selon l'invention intégrant le moyen de déclenchement du fonctionnement du dispositif dans l'enveloppe du dispositif ou une partie de cette enveloppe, cela facilite la fabrication par réduction du nombre de pièces et rautomatisation de l'assemblage. Ce poussoir, qui ne peut passer de sa position ou forme neutre à sa position ou forme active que par une transformation de forme nécessitant que l'on exerce un certain effort, il ne risque pas en général d'être déformé accidentellement et, par suite, d;être rendu inutilisable. Le détecteur selon l'invention peut se stocker, se transpor- ter ou s'expédier dans de bonnes conditions sans être mis à une température particulière, c'est-à-dire qu'il peut être à la température ambiante, sans que la matière migrante ne risque d'être mise au contact de la bande poreuse et de rendre le dispositif inutilisable. De même, avant son déclenchement, pour éviter tout enre- gistrement erroné, le dispositif peut être d'abord mis à basse température, par exemple à la température de conservation de produits, avant que lui- même ne soit déclenché. Ce n'est qu'après sa mise en température qu'il est ainsi possible de le déclencher par actionnement et déformation du poussoir. De plus, comme la déformation du poussoir est irréversible, le dispositif de détection ne risque pas de se neutraliser de manière intempestive alors qu'il doit être dans son état actif. D'une manière particulièrement avantageuse, vis-à-vis de l'extérieur du dispositif, le poussoir a une forme neutre convexe et une forme active concave. Le réservoir contenant la dose de matière migrante peut être réalisé de différentes manière. Une réalisation avantage est caractérisée en ce que- a pusher integrated into the wall of the envelope at least partially surrounding the porous strip, located at the level of the reservoir, and deforming between * a neutral, stable shape, not bringing into contact the irrigant material and the porous strip , and * an active, stable form, bringing the migrating material into contact with the porous strip, the irreversible deformation of the pusher between its neutral form and its active form being effected with effort. Like the device according to the invention integrating the means for triggering the operation of the device in the envelope of the device or a part of this envelope, this facilitates manufacture by reducing the number of parts and automating the assembly. This pusher, which cannot pass from its neutral position or form to its position or active form that by a transformation of form requiring that one exerts a certain effort, there is generally no risk of being accidentally deformed and, consequently, d ; be rendered unusable. The detector according to the invention can be stored, transported or shipped in good conditions without being brought to a particular temperature, that is to say it can be at room temperature, without the migrating material cannot be brought into contact with the porous strip and render the device unusable. Likewise, before being triggered, in order to avoid any erroneous recording, the device can first be put at low temperature, for example at the product storage temperature, before itself is triggered. It is only after it has warmed up that it is thus possible to trigger it by actuation and deformation of the pusher. In addition, as the deformation of the pusher is irreversible, the detection device does not run the risk of neutralizing itself in an untimely manner when it must be in its active state. In a particularly advantageous manner, with respect to the exterior of the device, the pusher has a convex neutral shape and a concave active shape. The reservoir containing the dose of migrating material can be produced in different ways. An advantageous embodiment is characterized in that
- le réservoir est une matière poreuse imbibée d'une dose de matière migrante, et - le poussoir est situé au droit du réservoir et de l'extrémité initiale de la bande poreuse, et lorsque- the reservoir is a porous material soaked with a dose of migrating material, and - the pusher is located to the right of the reservoir and the initial end of the porous strip, and when
- le poussoir est dans sa for e active, il presse le réservoir contre extrémitê de la bande poreuse pour permettre le passage de la matière migrante dans la bande poreuse. Cette réalisation du dispositif facilite la fabrication en série et le dosage de la matière migrante puisque des réservoirs en matière poreuse imbibés de matière migrante peuvent être réalisés séparément de l'assemblage du dispositif, c'est-à-dire de la mise en place du réservoir, du poussoir et de la surface indicatrice avec la bande poreuse. Suivant une caractéristique avantageuse, le réservoir est une enceinte contenant une dose de matière migrante, et placée au droit de extrémitê initiale de la bande poreuse, et le poussoir muni d'une pointe en regard de l'enceinte, au droit de celle-ci et de l'extrémité initiale de la bande poreuse ; en position active, le poussoir perce l'enceinte de la matière migrante pour lui permettre le passage dans la bande poreuse. Le dispositif selon l'invention se réalise particulièrement simplement sous la forme d'une étiquette comprenant - une couche de support munie de la surface indicatrice,- The pusher is in its active form, it presses the reservoir against the end of the porous strip to allow passage of the migrating material in the porous strip. This embodiment of the device facilitates mass production and metering of the migrating material since reservoirs made of porous material soaked with migrating material can be produced separately from the assembly of the device, that is to say from the installation of the tank, pusher and indicator surface with the porous strip. According to an advantageous characteristic, the reservoir is an enclosure containing a dose of migrating material, and placed at the right of the initial end of the porous strip, and the pusher provided with a point facing the enclosure, at the right of the latter. and from the initial end porous tape; in the active position, the pusher pierces the enclosure of the migrating material to allow it to pass through the porous strip. The device according to the invention is produced particularly simply in the form of a label comprising - a support layer provided with the indicating surface,
- une bande poreuse couvrant la surface indicatrice,- a porous strip covering the indicator surface,
- une couche supérieure couvrant la bande poreuse et la couche de support et formant un réservoir en relief logeant une pastille de matière poreuse chargée de la dose de matière migrante, * cette pastille étant fixée au fond du réservoir pour ne pas être au contact avec la bande poreuse (position neutre), * ce réservoir étant déformable de manière rémanente en position active et mettant alors la pastille en contact avec la bande poreuse. Le dispositif selon l'invention peut également être réalisé comme étiquette permettant une détection automatique d'un dépassement de température ou d'un séjour prolongé à une température non autorisée, l'étiquette comprenantan upper layer covering the porous strip and the support layer and forming a raised reservoir housing a pellet of porous material charged with the dose of migrating material, * this pellet being fixed to the bottom of the reservoir so as not to be in contact with the porous strip (neutral position), * this reservoir being deformable in a remanent manner in the active position and then bringing the pellet into contact with the porous strip. The device according to the invention can also be produced as a label allowing automatic detection of a temperature overshoot or an extended stay at an unauthorized temperature, the label comprising
- une couche de support munie de la surface indicatrice,- a support layer provided with the indicating surface,
- une bande poreuse couvrant la surface indicatrice, - une couche supérieure couvrant la bande poreuse et la couche de support et formant un réservoir en relief logeant une pastille de matière poreuse chargée de la dose de matière migrante, * cette pastille étant fixée au fond du réservoir pour ne pas être au contact avec la bande poreuse en position neutre, et * ce réservoir étant déformable de manière rémanente en position active, mettant alors la pastille en contact avec la bande poreuse. Ainsi grâce à l'invention, le dispositif notamment en forme d'étiquette associée à un produit, interdira la lecture du code à barres ou l'interprétation du code à barres puisque ce code à barres sera déformé par l'élément perturbateur apparaissant et simulant un trait du code à barres. Toutefois, si le produit auquel est associé le dispositif n'a pas dépassé la température de contrôle, l'élément perturbateur du dispositif n'apparaîtra pas dans la fenêtre et le code à barres sera interprété normalement. Le produit muni du dispositif pourra alors être automatiquement considéré comme n'ayant pas dépassé la température de contrôle. Inversement, au cas où cette température de contrôle est dépassée et que l'élément perturbateur apparaît comme barre supplémentaire du code à barres, le lecteur ne pourra interpréter ce code à barres et rejettera le produit associé à ce dispositif. Ce contrôle est particulièrement simple et surtout, il s'applique à toutes les formes de codes à barres du fait de l'introduction d'un élément perturbateur interdisant l'interprétation du code à barres lorsque cet élément perturbateur est apparent. Le dispositif selon l'invention peut se fabriquer en grandes séries sous la forme de nappes préimprimées constituant la couche de support munie des surfaces indicatrices pour chaque dispositif, et recevant la bande poreuse, également répartie sous forme de nappe prédécoupée et enfin, une couche supérieure couvrant la bande poreuse et la couche de support pour former le logement de la pastille de matière po- reuse chargée de la dose de matière migrante. Cette pastille sera préalablement placée dans les logements de la couche supérieure, celle-ci étant par exemple mise en forme par thermoformage. Après assemblage, la bande est découpée en étiquettes. Comme le logement formant le réservoir ou contenant la pastille de ma- tière poreuse chargée de la dose de matière migrante reste écarté de la bande poreuse, quel que soit l'état physique de la matière migrante, comme celle-ci n'est pas en contact avec la bande poreuse, il n'y a pas déclenchement du dispositif. En d'autres termes, la fabrication, l'assemblage et le découpage des dispositifs détecteurs sont des opérations qui peuvent se faire intégralement à la température ambiance quelle que soit la température de contrôle. Ainsi, il n'est pas nécessaire d'assembler les dispositifs de détection à une température inférieure à la température de contrôle ce qui, pour des températures de contrôle basses, comme celles que doivent respecter les produits congelés ou produits de ce type, constitue des con- traintes particulièrement gênantes pour les procédés industriels de fabrication en grandes séries de produits peu coûteux. Inversement, comme cette fabrication peut se faire à la température ambiante, il n'est pas nécessaire d'installer des enceintes mises en température et de faire travailler l'équipement de fabrication à des températures très basses ; cela réduit considérablement le coût de fabrication et permet l'obtention de dispositifs de détection à un coût favorable à leur grande diffusion. Dessins La présente invention sera décrite ci-après de manière plus détaillée à l'aide de modes de réalisation représentés dans les dessins annexés dans lesquels : - la figure 1 montre, dans ses parties a et b, un schéma de principe d'un dispositif de détection et de mesure quantitative de l'exposition d'un objet à une température de contrôle selon les principes généraux de l'art antérieur, montrant dans sa partie a, le dispositif en position neutre et dans sa partie b, le dispositif après détection d'un dépasse- ment de température pendant une durée donnée,- a porous strip covering the indicator surface, - an upper layer covering the porous strip and the support layer and forming a raised reservoir housing a pellet of porous material charged with the dose of migrating material, * this pellet being fixed to the bottom of the reservoir so as not to be in contact with the porous strip in the neutral position, and * this reservoir being deformable remanently in the active position, then bringing the pellet into contact with the porous strip. Thus thanks to the invention, the device in particular in the form of a label associated with a product, will prohibit the reading of the bar code or the interpretation of the bar code since this bar code will be deformed by the disturbing element appearing and simulating a barcode stroke. However, if the product with which the device is associated has not exceeded the control temperature, the device's disturbing element will not appear in the window and the barcode will be interpreted normally. The product fitted with the device can then be automatically considered as not having exceeded the control temperature. Conversely, if this control temperature is exceeded and the disturbing element appears as an additional bar of the bar code, the reader will not be able to interpret this bar code and will reject the product associated with this device. This control is particularly simple and above all, it applies to all forms of bar codes due to the introduction of a disturbing element prohibiting the interpretation of the bar code when this disturbing element is apparent. The device according to the invention can be produced in large series in the form of pre-printed sheets constituting the support layer provided with indicator surfaces for each device, and receiving the porous strip, also distributed in the form of a pre-cut sheet and finally, an upper layer. covering the porous strip and the support layer to form the housing for the porous material pellet loaded with the dose of migrating material. This tablet will be previously placed in the housings of the upper layer, the latter being for example shaped by thermoforming. After assembly, the strip is cut into labels. As the housing forming the reservoir or containing the pellet of porous material charged with the dose of migrating material remains away from the porous strip, whatever the physical state of the migrating material, as this is not in contact with the porous strip, there is no triggering of the device. In other words, the manufacturing, assembly and cutting of the detector devices are operations which can be carried out entirely at ambient temperature whatever the control temperature. Thus, it is not necessary to assemble the detection devices at a temperature below the control temperature which, for low control temperatures, such as those which must be observed in frozen products or products of this type, constitutes constraints which are particularly troublesome for industrial processes for mass production of inexpensive products. Conversely, as this manufacturing can be done at room temperature, it is not necessary to install temperature-controlled enclosures and to make the manufacturing equipment work at very low temperatures; this considerably reduces the manufacturing cost and makes it possible to obtain detection devices at a cost favorable to their wide distribution. Drawings The present invention will be described below in more detail with the aid of embodiments represented in the appended drawings in which: - Figure 1 shows, in its parts a and b, a block diagram of a device detection and quantitative measurement of the exposure of an object to a control temperature according to the general principles of the prior art, showing in its part a, the device in neutral position and in its part b, the device after detection a temperature overshoot during a given period,
- la figure 2 est une vue du dispositif de détection de température et de son enveloppe, l'ensemble étant en position neutre,FIG. 2 is a view of the temperature detection device and its envelope, the assembly being in the neutral position,
- les figures 3a-5b montrent schématiquernent trois modes de réalisation d'un dispositif selon l'invention en limitant le dessin à la partie princi- pale du dispositif sans montrer tout le développement du chemin de migration, * la figure 3a montre un premier mode de réalisation d'un dispositif de détection et de mesure quantitative selon l'invention en position neutre, * la figure 3b est une vue analogue à celle de la figure 3a, après déclenchement du dispositif de détection et de mesure quantitative, * la figure 4 montre de façon analogue aux figures 3a, 3b, dans sa partie a, un mode de réalisation du dispositif de détection et de mesure quantitative en position neutre et, dans sa partie b, la mise en œuvre du dispositif, * la figure 5 montre, dans ses parties a et b, comme précédemment, un autre mode de réalisation d'un dispositif de détection et de mesure quantitative de l'exposition d'un objet à une température de contrôle, en position neutre dans sa partie a et en position active dans sa partie b,- Figures 3a-5b show schematically three embodiments of a device according to the invention by limiting the drawing to the main part of the device without showing the entire development of the migration path, * Figure 3a shows a first mode for producing a quantitative detection and measurement device according to the invention in neutral position, * FIG. 3b is a view similar to that of FIG. 3a, after triggering of the quantitative detection and measurement device, * FIG. 4 shows analogously to FIGS. 3a, 3b, in its part a, an embodiment of the quantitative detection and measurement device in neutral position and, in its part b, the implementation of the device, * FIG. 5 shows, in its parts a and b, as before, another embodiment of a device for detecting and quantitatively measuring the exposure of an object to a control temperature, in the neutral position in its part a and in the active position in its part b,
- la figure 6 est une vue en coupe d'un dispositif de détection et de mesure selon l'invention, en forme d'étiquette,FIG. 6 is a sectional view of a detection and measurement device according to the invention, in the form of a label,
- la figure 7 est une vue en perspective d'un autre mode de réalisation d'un dispositif de détection et de mesure en forme d'étiquette portant un code à barres.- Figure 7 is a perspective view of another embodiment of a detection and measurement device in the form of a label bearing a bar code.
Description de modes de réalisation préférentiels Les figures 3a-5b montrent un dispositif de détection et de mesure selon l'invention, limité à la partie gauche tel qu'il apparaît par exemple à la figure 2 correspondant à l'extrémité initiale du chemin de migration sans montrer tout son développement. Selon le premier mode de réalisation (figures 3a, 3b), le dispositif 100 comprend une enveloppe 106 recevant une surface indica- trice 101, schématisée ici par une échelle ou des graduations. Cette surface 101 est couverte du côté visible' (figuré par un oeil O) par une bande en matière poreuse 102 initialement opaque, l'ensemble définissant ainsi le chemin de migration. Un réservoir 103 contenant une dose de matière migrante 104 est placé à proximité de la bande poreuse 102 mais initialement non en contact avec celle-ci. Enfin, il est prévu un cache 105 dégageant une fenêtre 151 au-dessus de chemin de migration. Le réservoir 103 contenant la dose de matière migrante 104 est placé au-dessus de l'extrémité initiale 120 du chemin de migration, c'est-à-dire au-dessus de l'extrémité correspondante de la surface indica- trice 101 et de la bande poreuse 102. Au droit du réservoir 103, l'enveloppe 106 comporte un poussoir 107 de forme convexe vis-à-vis de l'extérieur lorsque le poussoir est dans sa position (ou forme) neutre ou position non activée représentée à la figure 3a. A ce moment, le poussoir 107 n'actionne pas le réser- voir 103 et ce dernier est séparé de la bande poreuse 102 de sorte que la matière migrante 104 reste confinée dans le réservoir 103 et ne peut passer dans la bande poreuse 102 et y migrer. Pour mettre en œuvre le dispositif de détection 100, par exemple associé à un produit dont on veut contrôler le dépassement de la température de contrôle te correspondant à une température de conservation, une fois le dispositif de détection 100 mis en place, on actionne le poussoir 107 pour le déformer de force et le faire passer de sa forme neutre (figure 3a) à sa forme active 107a (figure 3b). Le poussoir est retenu dans sa forme neutre par sa résis- tance de forme. Pour le faire passer dans sa forme active 107a, il faut exercer un certain effort (flèche A) de déformation pour passer la position métastable. Cet effort dépend par exemple des caractéristiques de la matière ou, plus généralement, des caractéristiques mécaniques du poussoir. Cette transformation est irréversible, le poussoir étant déformé d'une forme à l'autre en passant par une forme ou un état métastable de sorte qu'il est forcé vers sa position active et il y est retenu. Le poussoir 107a en position active appuie le réservoir 103 de la dose de matière migrante 104 contre la bande poreuse 102 de sorte que, si la température de contrôle est dépassée, la matière migrante 104 passe par capillarité dans la bande poreuse 102 et l'imprègne en y progressant en fonction de la température du dispositif et la durée pendant laquelle le dispositif est exposé à cette température supérieure à la température de contrôle. L'imprégnation de la bande poreuse 102 par la matière migrante rend la bande poreuse transparente. Cet état est schématisée à la figure 3b qui montre la matière poreuse remplacée sur la partie initiale de sa longueur par un trait continu épais 121 figurant son imprégnation. Toute la partie de la bande poreuse (partie représentée par un trait continu) est transparente ou au moins translucide et, dans tous les cas, du côté visible, elle laisse apparaître la surface indicatrice. Dans le cas représenté, cette surface apparaît à travers la fenêtre 151. En l'absence de fenêtre, toute la graduation de la surface indicatrice 101 couverte par le trait continu 121 représentant la partie devenue transparente de la bande poreuse est visible. La figure 4 montre une variante 200 du dispositif de l'invention selon la figure 3. Dans cette variante, la bande poreuse 202 n'est pas placée entre la surface indicatrice 201 et le réservoir 203 au niveau de l'extrémité initiale du chemin de migration mais au-dessus du réservoir 203, sous le poussoir 207 qui est de même nature que celui de la figure 3, intégré dans la matière de l'enveloppe 206. En position neutre (figure 4a), la bande poreuse n'est pas en contact avec le réservoir 203 contenant la dose de matière migrante 204 et le poussoir a une forme convexe vis-à-vis de l'extérieur. Lorsqu'on enfonce le poussoir 207 comme l'indique la fLè- che A, en déformant avec effort le poussoir, on le fait passer dans sa forme ou position active 207a, concave vis-à-vis de l'extérieur. Dans cette position active stable, le poussoir 207a applique la bande poreuse 202 contre le réservoir 203 contenant la dose de matière migrante. Si alors le dispositif est exposé à une température supérieure à la température de contrôle, la matière migrante passe du réservoir dans la bande poreuse 202 et y migre progressivement en fonction de la durée d'exposition, comme cela a été expliqué ci-dessus. La partie imprégnée de la bande 202 est figurée par un trait épais 221. La détection et la mesure quantitative de l'exposition de l'objet à une température supérieure à la température de contrôle se font dans les mêmes conditions que ce qui a été décrit ci-dessus à propos de la figure 3. La figure 5 montre, dans ses parties a et b, un autre mode de réalisation du dispositif de détection et de mesure 300 selon l'invention. Dans ce cas, le poussoir 307 intégré dans l'enveloppe 306 a une forme analogue à celle décrite ci-dessus : une forme convexe, bombée vers l'extérieur en position neutre, stable et une forme concave tournée vers l'intérieur de l'enceinte en position active, stable. Le passage de la po- sition neutre à la position active se fait en exerçant un certain effort (flèche A). Mais en variante des modes de réalisation précédents, le poussoir 307 comporte une broche 308 qui, en position neutre, ne touche pas le réservoir 303 contenant la dose de matière migrante 304. En position active, la broche 308 perce le réservoir 303 permettant ainsi à la a- tière migrante de passer dans la bande poreuse 302 lorsque les conditions de température sont établies (température supérieure à la température de contrôle). Les autres parties du dispositif 300 identiques à celles des modes de réalisation sont identifiées par des références analogues mais leur description ne sera pas répétée. La figure 6 montre en coupe schématisée un mode de réalisation en forme d'étiquette d'un dispositif de détection et de mesure quantitative. Cette étiquette 400, représentée en coupe, se compose d'une surface de support 401 portant, par exemple, la surface indicatrice sous la forme d'une graduation. Cette surface de support 401 est recouverte d'une bande de matière poreuse 402 et l'ensemble est couvert par une couche supérieure 406 formant l'enveloppe. Cette couche supérieure 406 est collée ou soudée à la surface de support 401. La couche supérieure délimite un bossage 407 contenant une pastille 403 formant réservoir, imprégnée de la dose de matière migrante. L'extrémité de cette étiquette 400 comporte un orifice 410 pour le passage d'une attache 411 figuré par un cercle, par exemple pour fixer l'étiquette à un produit. Le support 401 peut également être muni d'une zone adhésive, par exemple d'un adhésif double face couvert sur sa face extérieure d'une couche pelable pour permettre de coller l'étiquette 400 sur un produit ou objet dont on veut contrôler l'évolution de la température. La flèche A placée au-dessus du bossage 407 indique le déclenchement du dispositif de détection par pression sur le bossage 407 pour déformer le bossage 407 de manière rémanente et mettre la pas- tille 403 en contact avec la bande poreuse 402 et déclencher le fonctionnement du détecteur. L'étiquette 400 ainsi représentée peut se fabriquer en grande série et à température ambiante, par l'utilisation d'une nappe préimprimée contenant les surfaces indicatrices des étiquettes à fabriquer ; sur cette nappe on place des bandes de matière poreuse, puis on met en place la couche supérieure, prêformée avec des logements munis préalablement de pastilles imbibées. Cette couche supérieure est ensuite scellée à la couche inférieure en emprisonnant la bande poreuse et les pastilles imprégnées de doses de matière migrante. Enfin, l'ensemble est découpé pour donner des étiquettes unitaires ou des lots d'étiquettes. Cette technique de fabrication est très voisine des techniques d'impression ou techniques de fabrication d'enveloppes « blister ». La figure 7 montre, en vue en perspective, une autre forme d'étiquette de détection et de mesure 500 selon l'invention. Cette étiquette a la structure de celle de la figure 6, sauf que l'enveloppe couvrant 506 le chemin de migration formé par l , surface indicatrice couverte par la bande de matière poreuse 502 est opaque et ne comporte qu'une fenêtre 551 à un endroit précis. Le dessus de l'étiquette porte un code à barres 510. La surface indicatrice est munie d'une impression à la forme d'un trait de code à barres, au niveau de la fenêtre 551. Lorsque l'étiquette 500 a été déclenchée et n'a pas dépassé la température de contrôle, le trait de la surface indicatrice n'apparaît pas à travers la fenêtre 551 et le code à barres 510 se lit normalement. Mais si l'étiquette a dépassé la température de contrôle et que le produit migrant a migré dans la bande de matière poreuse jusqu'au niveau de la fenêtre 551, la bande devenue transparente laisse apparaître le trait de code à barres dans la fenêtre. Ce trait de code à barres constitue un élément perturbateur car il s'ajoute aux autres traits du code à barres et rend impossible la lecture du code à barres. Ce moyen simple permet de détecter d'une manière automatique une étiquette ayant ou non dépassée la température dé contrôle pendant une durée fixée. Cette durée peut être très courte en fonction du chemin de migration. Cela permet ainsi d'écarter automatiquement les produits ayant dépassé la température de contrôle. Dans le cas de l'exemple d'une caisse automatique, la lecture du code à barres du produit ne pourra pas se faire et le produit sera ainsi automatiquement rejeté. Description of preferred embodiments FIGS. 3a-5b show a detection and measurement device according to the invention, limited to the left part as it appears by example in Figure 2 corresponding to the initial end of the migration path without showing all of its development. According to the first embodiment (FIGS. 3a, 3b), the device 100 comprises an envelope 106 receiving an indicating surface 101, shown here by a scale or graduations. This surface 101 is covered on the visible side '(represented by an eye O) by a strip of porous material 102 initially opaque, the assembly thus defining the migration path. A reservoir 103 containing a dose of migrating material 104 is placed near the porous strip 102 but initially not in contact with the latter. Finally, a cover 105 is provided which releases a window 151 above the migration path. The reservoir 103 containing the dose of migrating material 104 is placed above the initial end 120 of the migration path, that is to say above the corresponding end of the indicator surface 101 and of the porous strip 102. In line with the reservoir 103, the casing 106 comprises a pusher 107 of convex shape with respect to the outside when the pusher is in its neutral position (or shape) or inactive position shown in the Figure 3a. At this time, the pusher 107 does not activate the reservoir 103 and the latter is separated from the porous strip 102 so that the migrating material 104 remains confined in the reservoir 103 and cannot pass into the porous strip 102 and there migrate. To implement the detection device 100, for example associated with a product for which it is desired to control the exceeding of the control temperature te corresponding to a storage temperature, once the detection device 100 is in place, the push-button is actuated 107 to forcibly deform it and change it from its neutral form (Figure 3a) to its active form 107a (Figure 3b). The pusher is retained in its neutral form by its shape resistance. To pass it in its active form 107a, it is necessary to exert a certain effort (arrow A) of deformation to pass the metastable position. This effort depends for example on the characteristics of the material or, more generally, on the mechanical characteristics of the pusher. This transformation is irreversible, the pusher being deformed from one form to another passing through a form or a metastable state so that it is forced towards its active position and it is retained there. The pusher 107a in the active position presses the reservoir 103 of the dose of migrating material 104 against the porous strip 102 so that, if the control temperature is exceeded, the migrating material 104 passes by capillary action in the porous strip 102 and impregnates it progressing there as a function of the temperature of the device and the duration during which the device is exposed to this temperature above the control temperature. The impregnation of the porous strip 102 by the migrating material makes the porous strip transparent. This state is shown diagrammatically in FIG. 3b which shows the porous material replaced over the initial part of its length by a thick continuous line 121 showing its impregnation. The whole part of the porous strip (part represented by a solid line) is transparent or at least translucent and, in all cases, on the visible side, it reveals the indicator surface. In the case shown, this surface appears through the window 151. In the absence of a window, the entire graduation of the indicator surface 101 covered by the solid line 121 representing the part that has become transparent of the porous strip is visible. FIG. 4 shows a variant 200 of the device of the invention according to FIG. 3. In this variant, the porous strip 202 is not placed between the indicator surface 201 and the reservoir 203 at the level of the initial end of the path migration but above the tank 203, under the pusher 207 which is of the same nature as that of FIG. 3, integrated into the material of the envelope 206. In the neutral position (FIG. 4a), the porous strip is not in contact with the reservoir 203 containing the dose of migrating material 204 and the pusher has a convex shape with respect to the outside. When the pusher 207 is depressed as indicated in arrow A, by deforming the pusher with effort, it is passed into its shape or active position 207a, concave with respect to the outside. In this stable active position, the pusher 207a applies the porous strip 202 against the reservoir 203 containing the dose of migrating material. If the device is then exposed to a temperature higher than the control temperature, the migrating material passes from the reservoir into the porous strip 202 and migrates there gradually as a function of the duration of exposure, as has been explained above. The impregnated part of the strip 202 is represented by a thick line 221. The detection and the quantitative measurement of the exposure of the object to a temperature above the control temperature are carried out under the same conditions as that which has been described. above with reference to FIG. 3. FIG. 5 shows, in its parts a and b, another embodiment of the detection and measurement device 300 according to the invention. In this case, the pusher 307 integrated in the casing 306 has a shape analogous to that described above: a convex shape, curved outward in the neutral position, stable and a concave shape facing the inside of the pregnant in active, stable position. The transition from the neutral position to the active position is made by exerting a certain effort (arrow A). However, as a variant of the previous embodiments, the pusher 307 comprises a pin 308 which, in the neutral position, does not touch the reservoir 303 containing the dose of migrating material 304. In the active position, the pin 308 pierces the reservoir 303 thus allowing the migrating matter to pass through the porous strip 302 when the temperature conditions are established (temperature higher than the control temperature). The other parts of the device 300 identical to those of the embodiments are identified by similar references but their description will not be repeated. FIG. 6 shows in schematic section an embodiment in the form of a label of a quantitative detection and measurement device. This label 400, shown in section, consists of a support surface 401 carrying, for example, the indicator surface in the form of a graduation. This support surface 401 is covered with a strip of porous material 402 and the assembly is covered by an upper layer 406 forming the envelope. This upper layer 406 is bonded or welded to the support surface 401. The upper layer defines a boss 407 containing a pellet 403 forming a reservoir, impregnated with the dose of migrating material. The end of this label 400 includes an orifice 410 for the passage of a fastener 411 represented by a circle, for example to fix the label to a product. The support 401 can also be provided with an adhesive zone, for example with a double-sided adhesive covered on its external face with a peelable layer to allow the label 400 to be affixed to a product or object of which one wishes to control the temperature evolution. The arrow A placed above the boss 407 indicates the triggering of the pressure detection device on the boss 407 to deform the boss 407 remanently and bring the pin 403 in contact with the porous strip 402 and trigger the operation of the detector. The label 400 thus represented can be produced in large series and at room temperature, by the use of a tablecloth preprinted containing the indicative surfaces of the labels to be manufactured; strips of porous material are placed on this sheet, then the upper layer, preformed with housings previously provided with soaked pellets, is put in place. This upper layer is then sealed to the lower layer by trapping the porous strip and the pellets impregnated with doses of migrating material. Finally, the assembly is cut to give unit labels or batches of labels. This manufacturing technique is very similar to printing techniques or techniques for manufacturing “blister” envelopes. FIG. 7 shows, in perspective view, another form of detection and measurement label 500 according to the invention. This label has the structure of that of FIG. 6, except that the envelope covering 506 the migration path formed by the indicator surface covered by the strip of porous material 502 is opaque and only has a window 551 in one place. specific. The top of the label has a bar code 510. The indicator surface is provided with a print in the form of a bar code line, at window 551. When the label 500 has been triggered and has not exceeded the control temperature, the line of the indicator surface does not appear through window 551 and the bar code 510 can be read normally. But if the label has exceeded the control temperature and the migrant has migrated into the strip of porous material up to the level of window 551, the strip which has become transparent reveals the bar code line in the window. This bar code line is a disturbing element because it is added to the other lines of the bar code and makes it impossible to read the bar code. This simple means makes it possible to automatically detect a label which may or may not have exceeded the control temperature for a fixed period. This duration can be very short depending on the migration path. This allows automatic removal of products that have exceeded the control temperature. In the case of the example of an automatic checkout, the barcode of the product cannot be read and the product will therefore be automatically rejected.

Claims

R E V E N D I C A T I O N S 1°) Dispositif de détection et de mesure quantitative de l'exposition d'un objet à une température de contrôle avec prise en compte de la durée de cette exposition, formé d'une enveloppe comprenant - une surface indicatrice (301), couverte du côté visible par une bande (302) en une matière poreuse initialement opaque, formant un chemin de migration, CLAIMS 1) Detection and quantitative measurement device of the exposure of an object to a control temperature with taking into account the duration of this exposure, formed of an envelope comprising - an indicator surface (301), covered on the visible side by a strip (302) of an initially opaque porous material, forming a migration path,
- un réservoir (303) contenant une dose de matière migrante (304) changeant d'état à une température supérieure ou égale à la température de contrôle (te) et se propageant alors par capillarité à une vitesse déterminée dans la bande poreuse (302) pour la rendre transparente par imprégnation progressive pour laisser apparaître par transparence la surface indicatrice (301), dans lequel - la matière migrante (304) est contenue dans un réservoir (303) initialement séparé de la bande poreuse (302), et- a reservoir (303) containing a dose of migrating material (304) changing state at a temperature greater than or equal to the control temperature (te) and then propagating by capillary action at a determined speed in the porous strip (302) to make it transparent by progressive impregnation in order to allow the indicator surface (301) to appear by transparency, in which - the migrating material (304) is contained in a reservoir (303) initially separated from the porous strip (302), and
- un poussoir (307) intégré à la paroi de l'enveloppe (306) entourant au oins partiellement la bande poreuse (302), situé au niveau du réservoir (303), et se déformant entre * une forme neutre, stable (307), ne mettant pas en contact la matière migrante (304) et la bande poreuse (302), et * une forme active, stable, mettant en contact la matière migrante et la bande poreuse, la déformation irréversible du poussoir entre sa forme neutre et sa forme active se faisant avec effort, caractérisé en ce que le réservoir (303) est une enceinte contenant une dose de matière migrante (304), placée au droit de l'extrémité initiale de la bande poreuse (302), et le poussoir est muni d'une pointe (308) en regard de l'enceinte, au droit de celle-ci et de rextrémitê initiale de la bande poreuse, et en position active, le poussoir perce l'enceinte de la matière migrante pour lui permettre le passage dans la bande poreuse.- A pusher (307) integrated into the wall of the envelope (306) partially surrounding the porous strip (302), located at the level of the reservoir (303), and deforming between * a neutral, stable form (307) , not bringing the migrating material (304) into contact with the porous strip (302), and * an active, stable form, bringing the migrating material into contact with the porous strip, the irreversible deformation of the pusher between its neutral form and its active form being made with effort, characterized in that the reservoir (303) is an enclosure containing a dose of migrating material (304), placed in line with the initial end of the porous strip (302), and the pusher is provided with a point (308) opposite the enclosure, in line with the latter and the initial re-end of the porous strip, and in the active position, the pusher pierces the enclosure of the migrating material to allow it to pass through the porous strip.
2D) Dispositif selon la revendication 1, caractérisé en ce que vis-à-vis de l'extérieur du dispositif, le poussoir (107) a une forme neutre convexe et une forme active (107a) concave.2 D ) Device according to claim 1, characterized in that vis-à-vis the outside of the device, the pusher (107) has a neutral convex shape and an active shape (107a) concave.
3°) Dispositif selon la revendication 1, caractérisé en ce que3 °) Device according to claim 1, characterized in that
- le réservoir (403) est une matière poreuse imbibée d'une dose de matière migrante, etthe reservoir (403) is a porous material soaked with a dose of migrating material, and
- ce réservoir est placé au droit de l'extrémité initiale de la bande po- reuse (402), etthis reservoir is placed in line with the initial end of the porous strip (402), and
- le poussoir (407) est situé au droit du réservoir et de l'extrémité initiale de la bande poreuse (402), etthe pusher (407) is located to the right of the reservoir and the initial end of the porous strip (402), and
- dans sa forme active, le poussoir presse le réservoir (403) contre rextrémitê de la bande poreuse (402) pour permettre le passage de la matière migrante dans la bande poreuse.- In its active form, the pusher presses the reservoir (403) against re-extremity of the porous strip (402) to allow the passage of the migrating material in the porous strip.
4°) Dispositif selon la revendication 1, caractérisé en ce qu' il se présente sous la forme d'une étiquette (400) comprenant - une couche de support (401) munie de là surface indicatrice,4 °) Device according to claim 1, characterized in that it is in the form of a label (400) comprising - a support layer (401) provided with there indicative surface,
- une bande poreuse (402) couvrant la surface indicatrice (401),- a porous strip (402) covering the indicator surface (401),
- une couche supérieure (406) couvrant la bande poreuse (402) et la couche de support (401) et formant un poussoir (407) en relief logeant une pastille de matière poreuse (403) chargée de la dose de matière i- grante, * cette pastille (403) étant fixée au fond du réservoir pour ne pas être au contact avec la bande poreuse (position neutre), * ce poussoir étant déformable de manière rémanente en position active et mettant alors la pastille (403) en contact avec la bande po- reuse (402).an upper layer (406) covering the porous strip (402) and the support layer (401) and forming a pusher (407) in relief housing a pellet of porous material (403) charged with the dose of irrigating material, * this pellet (403) being fixed to the bottom of the reservoir so as not to be in contact with the porous strip (neutral position), * this pusher being deformable in a remanent manner in the active position and then putting the pellet (403) in contact with the porous strip (402).
5°) Dispositif selon la revendication 1, caractérisé en ce que le dessus couvrant la bande poreuse (502) définissant le chemin de mi- gration et muni d'un code à barres (510) muni et comporte une fenêtre (551) au droit d'un élément perturbateur similaire à un trait du code barres prévu sur la surface indicatrice et rendu visible lorsque la matière migrante a progressé le long de la bande poreuse jusqu'à l'élément perturbateur pour le faire apparaître dans la fenêtre (551) à la suite du code à barres (510) et constituer avec celui-ci un code qui ne peut plus être lu comme un code à barres. 5 °) Device according to claim 1, characterized in that the top covering the porous strip (502) defining the migration path and provided with a bar code (510) provided and has a window (551) at right of a disturbing element similar to a bar code line provided on the indicating surface and made visible when the migrating material has progressed along the porous strip to the disturbing element to make it appear in the window (551) at following the bar code (510) and constitute with it a code which can no longer be read as a bar code.
PCT/FR2005/050221 2004-04-09 2005-04-08 Measurement of exposure to a control temperature WO2005104064A2 (en)

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FR0403754 2004-04-09
FR0403754A FR2868840B1 (en) 2004-04-09 2004-04-09 DEVICE FOR DETECTION AND QUANTITATIVE MEASUREMENT OF THE EXPOSURE OF AN OBJECT AT A CONTROL TEMPERATURE

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Cited By (1)

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FR3007834A1 (en) * 2013-06-26 2015-01-02 Galdino Barbieri DEVICE FOR DETECTING THE EXPOSURE OF AN OBJECT AT A TEMPERATURE TO BE TESTED WITH ACCOUNT OF THE EXPOSURE PERIOD

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FR2896311B1 (en) * 2006-01-18 2008-03-21 Galdino Barbieri DETECTOR FOR EXCEEDING A LIMITED TEMPERATURE
FR2912504B3 (en) * 2007-02-12 2009-04-17 Galdino Barbieri DEVICE FOR DETECTING AND MEASURING THE EXPOSURE OF AN OBJECT AT A TEMPERATURE TO BE CONTROLLED.
EP2368100A2 (en) * 2008-11-26 2011-09-28 Jean Pierre Viguie Device capable of indicating that at least one temperature threshold has been reached and/or exceeded
FR3006441A1 (en) * 2013-06-03 2014-12-05 Galdino Barbieri UPLINK TEMPERATURE INDICATOR

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FR2868840A1 (en) 2005-10-14
EP1747436A2 (en) 2007-01-31
WO2005104064A3 (en) 2006-01-12
FR2868840B1 (en) 2006-11-10

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