FR2939772A1 - PACKAGING SUITABLE TO CHANGE ASPECT - Google Patents

Abstract

The invention relates to a package (1) having at least one visible face of a wall comprising: - at least one conductive layer (4) formed of resistive electrically conductive material and extending on the wall forming an electrical circuit of activation and being adapted to heat up by the Joule effect under the effect of the electric current, - at least one layer (2) thermochromic, visible from the outside of the package and extending at least partly in the vicinity at least one such conductive layer (4) said thermochromic layer (2) being adapted to present an appearance in the presence of an electric current flowing in said conductive layer (4) which is different from that in the absence of electric current flowing in said conductive layer (4).

Description

PACKAGING SUITABLE TO CHANGE ASPECT

The invention relates to a packaging such as a bottle for perfume or cosmetics, adapted to be able to change its appearance and to obtain a surprising visual effect at least in a certain state of the packaging and / or during its use and / or in other circumstances. Such packaging can be used for example in perfumery (spray bottles, hoods, cases, mascaras, lipstick sticks ...), telephony (front and back shells of mobile phones), stationery (body and cap of pens ), in the automobile (automotive interior decorating components), and in the packaging of spirits (bottles and corks) ... Various devices and methods for providing a visual effect when using perfumery or cosmetics.

FR 2 908 502 discloses a bottle equipped with a graphic pattern illumination device controlled by a push button. Such a solution is limited in its applications to the case of translucent packaging capable of transmitting and guiding the light waves produced by the packaging during its use. This solution involves being able to guide the light emitted into the thickness of the walls of the bottle. The purpose of the invention is therefore to propose a package that can present, in particular during its use, a new surprising visual effect related to a change in surface appearance, in particular of transparency and / or of color, of at least one part of visible wall. outside and of a different nature than in the document evoked. The invention also aims at such a packaging likely to present a new surprising visual effect that can form one or more pattern (s) of great diversity of shapes, especially with forms of great complexity, which can be visible (s) from an outer face or from a plurality of outer faces of the package, and compatible with all kinds of walls (including opaque 2 2939772). The invention also aims to provide such a package, especially a bottle, whose outer surface may be flat, smooth, or corrugated, having regular period corrugations, or irregular ripples. The invention also aims to provide such a package that can also be adapted to remain compatible with a good grip by a user. In particular, the invention aims at providing such a packaging in which the surprising visual effect is generated by a decor that generates no extra thickness or only a small excess thickness, perfectly integrated in said packaging and not substantially modifying, in any other way, the shape said packaging, nor its size, its ergonomics, nor its mode of use. The invention also aims at providing such a packaging having a decor having an improved mechanical strength, especially with respect to impacts, but also a chemical resistance, particularly with respect to fluids. The invention also aims to achieve all these objectives at lower cost, by proposing a low cost packaging, which can be achieved by a simple and inexpensive process, requiring a small number of steps, and using means usual and inexpensive. The invention aims more particularly at providing a package that can be manufactured respecting the cost, quality, safety and reliability constraints required for operation on an industrial scale. To do this, the invention relates to a package having at least one visible face of a wall and comprising: at least one layer, called conductive layer, formed of resistive electrically conductive material and extending over a surface portion of electrically insulating material of said wall, said conductive layer having two ends and forming, between these two ends, an electrical activation circuit in which an electric current can flow when both ends are themselves powered by a power source 30 electrical connection to which they are connected, said conductive layer being adapted to heat up by Joule effect under the effect of this electric current, - at least one layer, said thermochromic layer, visible from outside the packaging and extending at least partly in the vicinity of at least one conductive layer adapted to be able to drive, by heating by ef Joule fet, an aspect modification of said thermochromic layer, said thermochromic layer comprising a thermochromic material adapted to have a visually observable appearance whose state depends on the electric current flowing in said conductive layer with which it is associated, this aspect in the presence of an electric current flowing in said conductive layer being different from that in the absence of electric current flowing in said conductive layer. The invention therefore consists of a package comprising a decoration (resulting from the combination of at least one thermochromic layer and / or at least one conductive layer and / or of said visible wall face of electrically insulating material) , which changes appearance depending on the establishment of an electric current, the latter being generated by an activation command according to a state of the packaging and / or the mere fact of the use of the packaging and / or following a specific maneuver of the user. This decoration may be at least partly of the visually imperceptible type in the absence of activation and visually perceptible by the user after activation, or conversely at least partly of the type visually perceptible by the user in lack of activation and visually imperceptible by the user after activation. Advantageously and according to the invention, at least one conductive layer extends outside and against an outer face of electrically insulating material of a peripheral wall of the package, and at least one thermochromic layer extends outside of said conductive layer with which it is associated, so that this thermochromic layer extends outside the package. This thermochromic layer then protects the conductive layer 30 underlying attacks of the external environment. However, alternatively or in combination, nothing prevents to provide a thermochromic layer extending inside a transparent or translucent wall of the package. Thus, advantageously and according to the invention, at least one thermochromic layer extends inside and against an inner face of electrically insulating material of a translucent or transparent wall, and at least one conductive layer extends within said thermochromic layer with which it is associated. The power supply of such a conductive layer can be achieved by a connection through said wall of the package, or by a power supply itself arranged, as well as the electrical circuit. activation, inside the package (the inner side with respect to said wall). Similarly, a package according to the invention may have a single thermochromic layer, or on the contrary a plurality of thermochromic layers, different or different, having changes in appearance under identical or different conditions (especially for electrical intensities). and / or different temperatures) so as to achieve varied decorations, for example multicolored whose colors change depending on the conditions of use and / or activation of the different (s) layer (s) conductor (s) ) associated. Moreover, nothing prevents the provision within the same thermo-chromic layer 20 of several thermo-chromic materials of distinct characteristics, for example whose appearance changes occur at different temperatures, so that the appearance of the package according to the invention changes continuously as the Joule effect is heated by the conductive layer. Advantageously and according to the invention, at least one thermochromic layer 25 is made of a material adapted to present a reversible modification of visually observable appearance as a function of the state of the electric current flowing in said conductive layer. Thus, the change of appearance is reversible, so that when the activation by the electric circuit ceases, said appearance change ceases or fades and the packaging returns to its original appearance. However, there is nothing to prevent providing, alternatively or in combination, at least one thermochromic layer adapted to present an irreversible modification of appearance. Simply choose an ink or thermochromic varnish irreversible type. For example, this irreversible modification can be activated at the first opening of the package, meaning that it is no longer a conductive layer formed of a resistive conductive material having an electrical resistivity can be adapted to dissipate by Joule effect a amount of heat capable of causing a visible change of at least one adjacent thermochromic layer. In particular, it turns out that such a visible change of a thermochromic layer can in fact be obtained even with a conductive layer of relatively low thickness, especially less than 100 m. Typically, in a package according to the invention, said resistive conductive material forming said conductive layer has an electrical resistivity greater than 3.10-5 am. Furthermore, advantageously, a package according to the invention comprises at least one thermally insulating layer extending facing at least one conductive layer associated with a thermochromic layer, said thermally insulating layer being disposed opposite said thermochromic layer with respect to the conductive layer. Such a thermally insulating layer promotes the heating of the thermochromic layer and accelerates the change of appearance during activation. Such a thermochromic layer may be formed for example of a varnish comprising thermochromic liquid crystals. Advantageously and according to the invention, at least one conductive layer is formed of a conductive ink ribbon printed on said wall (at least the surface receiving this conductive layer is of electrically insulating material), said ribbon having a thickness between 2 gm and 25 m. Such a printed conductive layer, in particular by screen printing, makes it possible to obtain a surprising surprising effect without appearing substantially in relief on the surface of the package. Thus, in a package according to the invention, the decor can be made with a sufficiently small thickness, at least partly outside the package without being perceptible by the user. A conductive layer formed of a ribbon of width and of a substantially constant thickness may be adapted to produce an electrical and / or thermal effect of substantially uniform intensity on the portion of the thermochromic layer opposite the electrical circuit formed by this conductive layer. Each thermochromic layer is arranged with respect to at least one conductive layer to which it is associated so as to be activated under the effect of the electric current, according to the nature of said thermochromic layer. In particular, in some embodiments of a package according to the invention, at least one thermochromic layer is superimposed on contact with at least one conductive layer. In other embodiments, at least one thermochromic layer is superimposed on at least one conductive layer, but with at least one intermediate layer preventing direct contact between these two thermochromic and conductive layers. For example, an electrically insulating intermediate layer may be provided, if necessary, between a conductive layer and a thermochromic layer whose appearance change is activated by the heat produced by joule effect by the conductive layer. In an alternative embodiment of a package according to the invention, a conductive layer is disposed in direct contact with a superimposed thermochromic layer. The transfer of heat emitted by the Joule effect from the conductive layer is then directly and efficiently between the conductive layer and the thermochromic layer without any element being interposed and does not oppose this heat transfer. However, in another variant, it is also possible to interpose a layer of an electrically insulating material and / or colored, and preferably non-insulating thermal, between the conductive layer and the thermochromic layer. For example, said thermochromic layer is formed of an electrically insulating thermo-chromic varnish. Advantageously, the varnish of the thermochromic layer is a colored varnish that may be discolored upon activation of the electrical circuit. In particular, advantageously and according to the invention, at least one thermochromic layer is adapted to be opaque in the absence of electric current flow in said conductive layer associated therewith, and to become at least partially translucent-in particular transparent in the presence of an electric current flowing in said conductive layer. In this way, when the electrical circuit is activated, not only does the thermochromic layer itself change in appearance, but it also reveals any underlying light and / or color effects. Advantageously, a package according to the invention comprises a DC power source and at least one switch adapted for, in the closed position, connecting said power supply source to the two ends of each conducting layer, and in the open position isolating both ends of each conductive layer from said power source. In addition, advantageously a package according to the invention comprises, for each conductive layer, two metal connection terminals bonded to said insulating wall electrically connected respectively to said ends of the conductive layer, and adapted to be connected to said power source electric when closing the switch. Advantageously and according to the invention, these terminals are flat metal plates, for example copper, less than 100 m thick. In particular, these terminals are adapted to not be perceptible to the touch by the user, even when they are arranged outside of said wall of the package. Preferably, said terminals are not covered with a thermochromic layer. Advantageously and according to the invention, the packaging further comprises at least one electrical capacitance (capacitor (s)) connected in series with respect to said power supply source. Such a capacitance makes it possible to store the electrical energy and thus to restore a higher energy for a shorter duration to the activation of the circuit. A package according to the invention can be of various kinds.

In particular, it is a bottle whose outer wall is made of a material chosen from glass and rigid synthetic polymeric materials. Other applications are possible. The invention also relates to a packaging characterized in combination by all or some of the characteristics mentioned above or below. Other objects, features and advantages of the invention will appear on reading the following description which refers to the appended figures representing preferred embodiments of the invention, given solely by way of non-limiting examples, and in which: FIG. 1 is an exploded schematic perspective view of a packaging at rest according to the invention; FIG. 2 is an exploded schematic perspective view of a package in use according to the invention; FIG. 3 is a diagrammatic sectional view of a detail of the upper part of the wall of the package along the line III-III of FIG. 1, at a connection terminal of a conductive layer; FIG. 4 is a diagram of an electrical circuit for activating a package according to the invention, FIGS. 5a to 5e are schematic views showing various steps of a method of realizing an embodiment of a device. packa e according to the invention, and FIG. 5f represents this packaging in use. A packaging according to the invention shown diagrammatically in FIG. 1 comprises, in the example shown, a bottle 1 adapted to contain a quantity of liquid or pasty composition, in particular a cosmetic composition such as a perfume. This bottle 1 comprises a so-called rigid or semi-rigid external insulating wall 12 consisting of a molded rigid or semi-rigid electrically insulating material, in particular a thermoplastic synthetic material, for example chosen from a polyolefin, a vinyl polymer, a polyamide, polystyrene, polycarbonate, polymethacrylate or polypropylene- or glass. Alternatively, the electrically insulating wall 12 may be formed of an electrically conductive metallic material coated with a layer of electrically insulating material. The wall 12 of the bottle 1 delimits an internal chamber 14 intended to receive the composition to be dispensed, and an upper neck 15 of radial dimensions reduced with respect to the width of the upper part of the chamber 14. The neck 15 receives a manual dispensing pump 16 of the composition contained in the chamber 14, this pump being screwed onto the neck 15 and associated with a plunger tube 17. The pump 16 can be actuated by a push button 18 movable downwards in translation and / or rotation, guided along the axis of the neck 15 and the pump 16 and with respect to a cover 19 fixed to the upper part 20 of the bottle 1 by any suitable means of rigid attachment such as bonding and / or elastic locking (for example of the type with ribs and / or pins and / or hooks, and grooves and / or grooves and / or recesses and / or conjugate lights) or other. When the user moves the button 18 down, he actuates the pump 16 and thus causes the dispensing of the product contained in the bottle via a dispensing orifice 28 formed through the wall of this button 18 pusher. In the example of Figure 1, the main lateral part of the rigid wall 12 is prismatic, but this shape is of course not mandatory, the bottle 1 may have any other general shape, for example cylindrical of revolution around the axis of the neck 15, frustoconical, ovoid, curved, pyramidal or any other regular or irregular geometric shape. The cover 19 is adapted to cover the entire upper part of the bottle 1 and therefore has the same width as the upper part of the bottle 1. The cover 19 is formed of a rigid shell, for example molded rigid plastic. Two metal terminals 5, for example made of copper or another metal or electrically conductive metal alloy, are glued on the top of the wall 12 of the bottle 1, so as to project upwardly with respect to the upper part of the vial, for the electrical connection of a layer 4 Io conductive. In the example shown, these metal terminals 5 are formed of two thin copper plates (for example having a thickness of about 50 m) serving as plugs male connection. A printed circuit board 21 is mounted inside the

cover 19, fixed to the latter, for example by gluing and / or using screws (not shown). In Figure 1, this plate 21 is shown dissociated from the cover 19 for purposes of illustration.

The plate 21 is provided with a central recess 22 to allow its passage around the neck 15. A stack 23 is mounted on the face

upper plate 21. It also carries connecting terminals 29, conjugate terminals 5 glued to the wall of the bottle, so as to establish an electrical connection with the latter when the cover 19 is mounted on the wall 12. In the In the example shown, the connection terminals 29 are female recesses able to receive the pads forming the male terminals 5.

A first terminal 24 of the battery 23 is connected to a switch 27, itself connected to a terminal of a series capacitor 25 whose other terminal is connected to one of the two terminals 29 of connection. The second terminal 26 of the battery 23 is connected to the other connection terminal 29. The switch 27 may be formed of a simple flexible blade extending above and away from the first

terminal 24 of the battery 23, so that this flexible blade can be moved down to the contact with the first terminal 24 of the battery 23, by the push button 18, which comprises a tab 30 coming into contact with this flexible blade when it is itself actuated downwards for dispensing the product contained in the bottle. As a result, when the button 18 push is operated

downwards, the two connection terminals 29 are fed by the battery 23 via the capacitor 25.

The conductive layer 4 is formed of a printed track on the outer face of electrically insulating material of the wall 12 so as to extend longitudinally between the two terminals 5 while forming a certain pattern, in the form of a ribbon in the example represent. This conductive track 4 can

be carried out in particular by screen printing based on a colorless conductive ink composition, glue or varnish, chosen for example from the conductive adhesive sold under the reference Elecolit 340 by Eleco (Gennevilliers, France) or inks or varnishes charged with metallic conductive particles and / or graphite. The thickness of the conductive track 4 is advantageously less than 100 m, especially between 2 m and 25 m, for example of the order of 10 m. The conductive layer 4 extends longitudinally continuously between the two terminals 5 so as to form an electrical circuit without rupture. The two ends 3 of the conductive layer 4 are deposited and electrically connected to the connection terminals 5. The conductive layer 4 can be produced by screen printing with a traditional screen printing machine of complex shapes, for example as sold under the reference Dubuit 329 or Dubuit 159 by the company Machines Dubuit (Noisy-le-Grand, France). Furthermore, it should be noted that if the wall 12 delimiting the chamber 14 of the bottle is not itself an electrically insulating material, nothing prevents to provide a coating of electrically insulating material on the wall 12 before print the conductive layer 4. A layer 2 of thermochromic varnish is applied to the outer face of the insulating wall 12, at least overlapping the conductive layer 4. This layer 2 of thermo-chromic varnish is formed of a thermochromic material, that is to say a material whose color and / or transparency varies as a function of temperature. In the example shown, this layer 2 thermochromic varnish covers the entire surface of the outer face of the wall 12. It does not cover the entire surface of the terminals 5, so that the protruding portion of these terminals 5 can be connected to the terminals 29 of the electrical supply circuit carried by the cover 19. To do this, preferably, the terminals 5 are covered with a protective adhesive coating before applying the varnish forming the layer 2 thermochromic. The thermochromic layer 2 can be applied by a traditional in-line varnishing machine. The thermochromic varnish may be of the hot polymerization type, for example by heating at 60 ° C. for 25 minutes. Advantageously, the thermochromic layer 2 is deposited so as to have an average thickness of less than 100 m, especially between 5 m 20 m, for example of the order of 12 .mu.m.

For example, use is made of a blue opaque thermochromic varnish comprising thermochromic microcapsules such as the thermochromic varnish marketed under the name Eclipse by The Alsa Corporation (Vernon, California, USA) or a blue opaque thermochromic varnish comprising liquid crystals such as commercialized thermochromic varnish

under the name Xposure by The Alsa Corporation (Vernon, California, USA). For example, a thermochromic varnish having a temperature range between 5 ° C and 80 ° C is chosen.

When the user presses the push button 18, the tab 30 actuates the switch 27 which closes the electrical circuit. This results in a

power supply of the conductive layer 4 and Joule heating of the latter. This heating produces a local modification of the portion of the thermochromic layer 2 covering said conductive layer 4, this part becoming at least partially transparent. The color of the conductive layer 4 then becomes apparent to the user and draws an attractive pattern and

surprising on the surface of the bottle 1 during its use. When the user stops pressing the pushbutton 18, the activation electrical circuit opens, the conductive layer 4 is no longer powered, and the thermochromic layer 2 resumes its initial appearance by masking the formed pattern by the conductive layer 4.

In a variant not shown of a package according to

the invention, it is possible to interpose a layer of thermally conductive colored material between the conductive layer 4 and the layer 2 of thermo-chromic varnish. Thus, when using the packaging according to the invention, the color of the colored material appears.

In another variant not shown of a packaging according to the invention, the layer 2 of thermo-chromic varnish incorporates different thermochromic materials and / or is formed by a juxtaposition of several layers of different compositions, these different materials. and / or layers having different transition temperatures. Thus, in this variant, according to the energy released by joule effect by the conductive layer 4 and / or depending on the external heating of the bottle in the user's hand, different areas appear colored during the transition of the varnish thermochromic.

Moreover, if necessary, it is possible to provide a thermally insulating layer (variant not shown) covering all or part of the thermochromic layer 2, that is to say extending in the opposite direction, with respect to this thermochromic layer 2, of the conductive layer 4. Such a thermally insulating layer may be formed for example of a single clear colorless varnish. It may be arranged outside the thermochromic layer 2 only facing the conductive layer 4, or on the contrary all around the entire wall 12 of the bottle. This thermally insulating layer makes it possible to prevent heat losses to the outside and favors the effectiveness of heating the thermo-chromic varnish 2 by the Joule effect induced by the conductive layer 4.

A package according to the invention may be manufactured according to the following method, an embodiment of which for a glass flask is shown in FIGS. 5a to 5e, in which:

in a first step (FIG. 5a), the two disjoint terminals 5 of an activation circuit are affixed by bonding to the upper part of the outer face of the wall 12 of the bottle, then,

in a second step (FIG. 5b), at least one conductive layer 4 is deposited by forming an electrically conductive contact with the two terminals 5 and the ends 3 of this conductive layer 4 and so as to form a conductive circuit on the surface of the insulating wall 12 and then

in a third step (FIG. 5c), depositing a thermochromic layer 2 covering at least part of said conductive layer 4 and not covering the terminals 5, the latter being protected beforehand by protective coating, then, in a fourth step (Figures 5d and 5e), we assemble the

cover 19 on the bottle, and electrically connect the electrical supply circuit

comprising at least one battery 23 and a switch 27, at terminals 5 for supplying the conductive layer 4. In the example shown, the thermochromic layer 2 covers the entire outer surface of the flask. Nothing prevents us from providing, on the contrary, that this layer covers only the conductive track 4, or that it covers this conducting track 4 and only a part of the outer surface of the

bottle. As indicated above, the electrical connection between the electric supply circuit and the terminals 5 is obtained simply by mounting the cover 19 on the upper part 20 of the wall 12 of the bottle 1, the terminals 5 and penetrating into the terminals 29 of this circuit.

A decor thus formed by a conductive layer 4 and a thermochromic layer 2 deposited outside the wall 12 of a bottle provides a very surprising effect without generating substantially extra thickness.

As shown in FIG. 5f, when pressing the push-button 18, the thermochromic layer 2 becomes at least translucent,

in particular transparent, facing the conductive track 4 and a decor appears corresponding to the trace of the conductive layer 4.

It should be noted that the same package 1 according to the invention may have a single decoration thus obtained, or conversely (variants not shown) a plurality of such decorations distributed on the surface of the package 1. It is indeed

it is possible to provide several conductive layers 4. It is also possible to provide separate thermochromic layers 2, located on one (or more) layer (s) conductor (s) to provide different effects or the opposite the same effect.

The various conductive layers that may be provided may be powered by the same electrical circuit and the same switch, or on the contrary by separate electrical circuits and / or separate switches.

A package according to the invention may also comprise, as a variant or in combination (not shown), such a decor provided on the side

inside the wall 12, that is to say in the chamber 14, since the appearance variation obtained by activation of the electrical circuit and visible from the outside, in particular through the thickness of the wall 12 which is then transparent or translucent. In this case, a conductive layer is formed on the inner face (of electrically insulating material) of the wall 12, and a thermochromic layer is

superimposed on the inner side to this conductive layer. The power supply of this conductive layer can then be obtained either by an electric supply circuit disposed inside the enclosure of the package; either from an electrical supply circuit similar to that described above disposed outside the wall 12, but with electrical connectors passing through the wall

12 to be connected to the ends of the conductive layer.

Furthermore, the activation of the power supply of each conductive layer 4 may result from the simple use of the packaging according to the invention, as in the embodiment described above and shown in the figures. However, any other form of activation control may be considered,

for example a specific switch actuated when tearing a seal of non-use preclusion, or a switch actuated by the opening of a cover or the removal of a cover ...

Also, if in the preferred embodiment described above and shown, it is expected that the conductive layer 4 is normally

not supplied with electric current, and become energized by the use of the packaging, nothing prevents the provision on the contrary at least one conductive layer connected to an electrical circuit that normally feeds it permanently , a switch allowing, in specific circumstances, for example when using the package, to remove this power supply by opening the circuit.

Similarly, the thermochromic layer 2 can also change its appearance by becoming transparent or translucent when activating the electric supply circuit as described above, or conversely change color and / or become more opaque because of this power supply.

The invention applies in particular but not exclusively to the decoration of packaging for cosmetic products, for example to the decoration of the perfume bottle. EXAMPLE: On a 50 ml glass perfume bottle of parallelepipedal shape, adapted to receive a protective cover 19 provided with an activation button 18 for activating a spraying device, it is adhered to an upper planar portion of the outer surface of the envelope of the flask, two flat copper terminals 5 of a thickness substantially of the order of 50 m. A layer of colorless conductive adhesive having a thickness substantially of the order of 10 m, and forming a pattern, the two ends of which are each in electrically conductive contact, is then deposited by screen printing on the outer face of the wall 12 of the glass vial. with the two terminals 5. The glue is allowed to dry at ambient temperature or a drying step is carried out in an oven, for example at 60 ° C. for 2 hours. A removable mask is applied to the outer surface of the two planar terminals. A thermochromic varnish of blue color is then applied, the transition temperature of which is 31.degree. The varnish is applied to the entire accessible outer surface of the wall 12 of the bottle, and then heated at a temperature of 60 ° C. for about 25 minutes, so that the varnish covers the outer surface of the wall 12 and extends over a thickness of about 12 m.

After polymerization of the thermochromic varnish, the bottle appears colored in blue over its entire apparent surface and only the slight relief created by the underlying screen printing of the conductive layer 4 is possibly perceptible. The removable masks are then removed from the terminals 5 and the power supply circuit is mounted in the cover 19 of the bottle. The supply circuit 30 includes a 1.5V low voltage flat cell and is constructed as described above. When the user exerts pressure on the push button 18 of the bottle, there is a discoloration of the thermochromic varnish in the area of the thermochromic layer superimposed on the conductive layer 4, thus revealing the topology of this conductive layer 4 . As soon as the user releases the pressure on the push button 18, the thermochromic layer 2 regains its initial color, masking the conductive layer 4. 17

Claims (1)

CLAIMS1 / Packaging (1) having at least one visible face of a wall and comprising: - at least one layer, called the conductive layer (4), formed of resistive electrically conductive material and extending over a surface portion of electrically material insulation of said wall, this conductive layer (4) having two ends (3) and forming, between these two ends (3), an electrical activation circuit in which an electric current can flow when the two ends (3) are -same powered by a power source (23) to which they are connected, said conductive layer (4) being adapted to heat up by the Joule effect under the effect of this electric current, - at least one layer, called thermochromic layer (2), visible from the outside of the package and extending at least partly in the vicinity of at least one conductive layer (4) adapted to be able to drive, by heating by e Joule effect, an appearance modification of said thermochromic layer (2), said thermochromic layer (2) comprising a thermochromic material adapted to have a visually observable appearance whose state depends on the electric current flowing in said layer (4) conductive with which it is associated, this aspect in the presence of an electric current flowing in said layer (4) conductor being different from that in the absence of electric current flowing in said layer (4) conductor. 2 / A package according to claim 1, characterized in that at least one conductive layer (4) extends outside and against an outer face of electrically insulating material of a peripheral wall of the package, and in that at least one thermochromic layer (2) extends outside said conductive layer (4) with which it is associated, so that said thermochromic layer (2) extends outwards of the packaging. 3 / A package according to one of claims 1 or 2, characterized in that at least one layer (2) thermochromic extends inside and against an inner face of electrically insulating material of a wall 19 2939772 translucent or transparent, and in that at least one conductive layer (4) extends inside said thermochromic layer (2) with which it is associated. 4 / A package according to one of claims 1 to 3, characterized in that at least one layer (2) thermochromic is a material 5 adapted to have a reversible change of appearance visually observable depending on the state electrical current flowing in said conductive layer (4). 5 / A package according to one of claims 1 to 4, characterized in that at least one thermochromic layer (2) is adapted to be opaque in the absence of electric current flow in said layer (4) conductor associated with it, and to become at least partially translucent in the presence of an electric current flowing in said conductive layer (4). 6 / Packaging according to one of claims 1 to 5, characterized in that at least one layer (2) thermochromic is superimposed on the contact of at least one layer (4) conductive. 7 / Package according to one of claims 1 to 6, characterized in that it comprises at least one thermally insulating layer extending facing at least one conductive layer (4) associated with a layer (2) thermo chromic, said thermally insulating layer being disposed opposite said thermochromic layer (2) with respect to the conductive layer (4). 8 / package according to one of claims 1 to 7, characterized in that at least one layer (4) conductive is formed of a ribbon (4) of conductive ink printed on said wall, said ribbon having a thickness 25 between 2 m and 25 m. 9 / A package according to one of claims 1 to 8, characterized in that it comprises a source (23) DC power supply and at least one switch (27) adapted for, in the closed position, connect said source (23) power supply at both ends (3) of each conductive layer (4), and, in the open position, isolating the two ends (3) of each conductive layer (4) of said power source (23). electric. 10 / A package according to claim 9, characterized in that it comprises, for each layer (4) conductive, two terminals (5) of metal connection bonded to said wall (12) electrically connected respectively to said ends (3) of the conductive layer (4), and adapted to be connected to said power source (23) at the closing of the switch (27). 11 / Packaging according to one of claims 9 or 10, characterized in that it further comprises at least one capacitor (25) electrically connected in series with respect to said source (23) of power supply. 12 / Packaging according to one of claims 1 to 11, characterized in that it is a bottle whose outer wall (12) is made of a material selected from glass and rigid polymeric synthetic materials.