METHOD AND INSTALLATION OF INTERIOR DECORATION FOR A GLASS-WALLED CONTAINER

Abstract

Method and installation for the interior decoration of a glass-walled container. The invention relates to a method for decorating a container (1) having a glass wall (2) delimiting a cavity (3) within which the container (1) is intended to contain a product, said wall (3) being translucent or transparent and having an inner face (4) facing said cavity (3), the method being characterized in that it comprises: a step of applying, on the inner face (4) of the wall (2) of the container (1), at least one first layer (14) of at least one first liquid composition, said first liquid composition being applied in a pattern formed of one or more lines (15) and / or bands using a rotating centrifugal disc spray head, and a step of hardening the first layer (14) to form an interior decorative coating (19) including said pattern. Methods and installations for decorating containers.Figure for the abridged version: Fig. 4.

Description

Title of the invention: METHOD AND INSTALLATION OF INTERIOR DECORATION OF A GLASS-WALLED CONTAINER

[0001] The present invention relates to the general field of packaging, and more specifically to hollow bodies with a glass wall, such as bottles or jars, forming containers intended to hold a product, such as in particular a liquid, viscous or pasty cosmetic product, and for example liquid body perfume.

[0002] The present invention relates more specifically to a method of decorating a container having a glass wall delimiting a cavity within which the container is intended to contain a product, said wall being translucent or transparent and having an internal face located opposite said cavity.

[0003] The present invention also relates to a decoration installation for a container having a glass wall delimiting a cavity within which the container is intended to contain a product, said wall being translucent or transparent and having an internal face located opposite said cavity.

[0004] The present invention also relates to a container provided with a glass wall delimiting a cavity within which the container is intended to contain a product, said wall being translucent or transparent and having an inner face located opposite said cavity.

[0005] In the primary packaging sector for cosmetic products, such as skincare creams or body perfumes, the use of glass for containers is particularly valued, given the generally high-quality image consumers associate with glass, and the objective qualities of transparency, robustness, and mechanical and chemical stability of this material. Therefore, all or almost all liquid body perfumes, and in particular perfumes considered "high-end" or "luxury," are contained in glass bottles. The aesthetic qualities of a perfume bottle are also extremely important for the overall commercial appeal of a fragrance.In this context, it is therefore essential to offer a container whose aesthetics are very clearly different from those of the competition, and which presents a particularly attractive and valuable character for the cosmetic product contained in the container.

[0006] In this respect, it is known to use various decorative techniques for glass bottles, these techniques most often relying on the application of a coating, generally colored, whether it is a substantially uniform coating applied on the entire exterior (or sometimes interior) surface of the bottle, or with a coating in the form of a printed design, for example, screen-printed onto the glass wall of the bottle. Such external coatings, however, generally have the disadvantage of being particularly susceptible to external damage (impacts, scratches, scrapes, etc.), which can significantly degrade the container's appearance. Another known container decoration technique involves applying a colored coating to the inside of a transparent container, which is then visible to the consumer through the outside of the container.However, given the complexity of optimally applying a decorative coating to the inside of a container, and particularly to a container with a complex geometry such as a bottle, the decorative effects achievable are generally limited to a uniform, more or less opaque, color on the inner surface of the container wall, unless complex and costly additional marking or engraving techniques, such as laser engraving, are used on the applied colored coating. Furthermore, while such an internal coating has the advantage of being resistant to external mechanical stresses, it can sometimes prove chemically incompatible with certain particularly aggressive cosmetic products, such as body perfumes, and gradually degrade under their influence, which has a clearly detrimental effect on the container's appearance.

[0007] The objects assigned to the invention are therefore intended to remedy the problem set out above and to propose a new decoration process and a new decoration installation, which make it possible to obtain in a simple and effective way a container which is particularly attractive from an aesthetic point of view.

[0008] Another object of the invention aims to propose a new decoration process which makes it possible to obtain a container capable of stably and durably holding a product, and in particular a cosmetic product which is relatively aggressive from a chemical point of view.

[0009] Another object of the invention aims to propose a new decoration process which is suitable for industrial implementation.

[0010] Another object of the invention aims to propose a new decoration process which is easy and inexpensive to implement.

[0011] Another object of the invention aims to propose a new decorating installation which, while allowing to obtain in an industrial way a particularly aesthetic container.

[0012] Another object of the invention aims to provide a new container which is particularly attractive from an aesthetic point of view.

[0013] Another object of the invention aims to provide a new container capable of stably and durably holding a product, and in particular a cosmetic product that is relatively aggressive from a chemical point of view.

[0014] Another object of the invention aims to propose a new container which is suitable for industrial production.

[0015] The objects assigned to the invention are achieved using a method for decorating a container provided with a glass wall delimiting a cavity within which the container is intended to contain a product, said wall being translucent or transparent and having an inner face located opposite said cavity, the method being characterized in that it comprises: - an application step, on the inner face of the container wall, of at least one first layer of at least one first liquid composition, said first liquid composition being applied in a pattern formed of one or more line(s) and / or band(s) using a rotating centrifugal disc spray head introduced inside said cavity, and - a hardening stage of the first layer to form an interior decorative coating including said pattern.

[0016] The objects assigned to the invention are also achieved using a container decoration installation having a glass wall delimiting a cavity within which the container is intended to contain a product, said wall being translucent or transparent and having an inner face located opposite said cavity, said installation being characterized in that it comprises a rotating centrifugal disc spray head and is designed and configured to implement a decoration process according to the invention.

[0017] The objects assigned to the invention are further reached by means of a container provided with a glass wall delimiting a cavity within which the container is intended to contain a product, said wall being translucent or transparent and having an internal face located opposite said cavity, said container being characterized in that said internal face is provided with an internal decorative coating including a pattern formed of one or more line(s) and / or band(s).

[0018] Other features and advantages of the invention will become apparent and will be described in more detail upon reading the following description, with reference to the accompanying drawings, which are given solely by way of illustrative and non-limiting examples, including:

[0019] [Fig-1] illustrates, according to a schematic perspective view, an example of a container concerned by the decoration process and installation according to the invention. In this example, the container is in this case a bottle, illustrated open;

[0020] [Fig.2] illustrates, according to a schematic cross-sectional view, one embodiment of certain operations which are advantageously included in the decoration process according to the invention;

[0021] [Fig.3] illustrates, according to a schematic cross-sectional view, one embodiment of other operations which are advantageously included in the decoration process according to the invention;

[0022] [Fig.4] illustrates, according to a schematic perspective view, an embodiment of a container obtained using a decoration process according to the invention from the container of [Fig. 1], which container thus decorated is shown closed by a stopper. [Fig. 4] illustrates, as such, an embodiment of a (decorated) container according to the invention;

[0023] [Fig.5] illustrates, according to a schematic perspective view, another mode of production of a container obtained using a decoration process according to the invention from the container of [Fig. 1], which container thus decorated is shown closed by a stopper. [Fig. 5] illustrates, as such, another embodiment of a (decorated) container according to the invention;

[0024] [Fig.6] illustrates, according to a schematic side view, one embodiment of a part of a decoration installation according to the invention for decorating the container of the [Fig.1].

[0025] The invention relates firstly to a method for decorating a container 1 having a glass wall 2 delimiting a cavity 3 within which the container 1 is intended to contain a product or substance. Preferably, said container 1 is intended to contain a cosmetic product. While this may be a powdered or granular cosmetic product (makeup, foundation, etc.), it is preferably a liquid cosmetic product (body perfume, nail polish, lotion, etc.), or a viscous or pasty cosmetic product (skincare cream, etc.). Even more preferably, the container 1 concerned by the invention is intended to contain, in particular, a cosmetic product consisting of an alcoholic liquid, such as a body perfume (typically containing more than 50% alcohol by volume).

[0026] The wall 2 of the container 1 of the invention has an inner face 4, located opposite the cavity 3, and an opposing outer face 5. Typically, the wall 2 of the container 1 defines a base 6 (or foot) and a side wall 7 of the container 1, which extends from and around the periphery of said base 6. Advantageously, the wall 2 of the container 1 defines an opening 8 that connects the cavity 3 to the outside, and through which the product can be extracted from said cavity 3. Advantageously, the container 1 extends along a principal axis of extension A-A' between said base 6 and said opening 8. In a preferred embodiment, illustrated by example in the figures, the container 1 is a bottle, intended, for example, to hold a body fragrance. The wall 2 of the container 1 then advantageously forms a The constriction of cavity 3, which defines the opening 8 connecting cavity 3 to the outside, and whose dimensions are relatively small compared to the dimensions of cavity 3. The lateral wall 7 of the container 1 thus typically defines a body 9, which extends from the bottom 6 and is continued by shoulders 10 constricting cavity 3. Said shoulders 10 are themselves extended by a narrow neck 11 (considering the respective dimensions of cavity 3) whose internal diameter then defines said opening 8. The invention is not, however, limited to a bottle, and the container 1 can, for example, constitute a jar, or any other type of container.The opening 8 of the container 1 is advantageously designed to be closed by means of a suitable closing device 12, consisting, for example, of a stopper, a lid, a seal, or a device for dispensing or applying the product, such as a dispensing pump, a spray head, or a rotating applicator ball. For this purpose, the wall 2 of the container 1 advantageously includes a ring 13, which projects from the side wall 7 (for example, at the neck 11), and which is shaped and configured to cooperate with the closing device 12, for example, by screwing, crimping, snapping, etc.

[0027] According to the invention, the wall 2 of the container 1 is translucent or transparent in the visible spectrum for the human eye. As previously stated, the wall 2 of the container 1 is made of glass, and more specifically, mineral glass. Preferably, the glass constituting the wall 2 of the container 1 is silica glass, for example, soda-lime glass or borosilicate glass. Even more preferably, the glass constituting the wall 2 of the container 1 is white or extra-white mineral glass (according to the usual definitions in the field of mineral glass), and therefore transparent and colorless in the visible spectrum for the human eye. The glass constituting the wall 2 may optionally include or be made of PCR glass, that is, glass including recycled glass. Advantageously, the wall 2 of the container 1 constitutes a monolithic piece of mineral glass, that is, a single piece, which defines within it the cavity 3.Container 1 can therefore advantageously be a molded glass container, manufactured in one piece using any known glassmaking process (blown-blown, pressed-blown, etc.).

[0028] As will be described in more detail below, the decoration process according to the invention comprises an application step, on the inner face 4 of the wall 2 of the container 1, of at least one first layer 14 of at least one first liquid composition. During said application step, the first liquid composition is applied, in accordance with the invention, in a pattern formed of one or more lines 15 and / or bands 16 using a rotating centrifugal disc spray head 17 (or projection head) 18 introduced into said cavity 3, typically through said opening 8 providing access to the latter. The The decoration method according to the invention further comprises, preferably after the application step of the first layer 14, a step of hardening said first layer 14 to form an internal decorative coating 19 including said pattern. Comprising at least said first layer 14 thus hardened, said internal decorative coating 19 advantageously adheres to the inner face 4 of the wall 2 of the container 1.

[0029] The invention is therefore essentially based on the idea of ​​decorating a glass-walled container 1 2 by creating an interior decorative coating 19, visible from outside the container 1 through its transparent or translucent wall 2, which includes a pattern formed of line(s) 15 and / or band(s) 16. The use of a spray head 17 with a rotating centrifugal disc 18 introduced inside said cavity 3 of the container 1 allows the simple and efficient obtaining of particularly clear and defined line(s) 15 and / or band(s) 16, and therefore of an interior decorative coating 19 with a particularly successful aesthetic effect.

[0030] Herein, the term "line" preferably means a substantially continuous and elongated mark, preferably substantially straight, and of very small width, particularly in relation to the dimensions of the inner face 4 of the glass wall 2 of the container 1. By extension, the term "strip" preferably means a substantially continuous and elongated mark, preferably straight, and whose width is greater than that of a line. Typically, as will be explained later, a strip can advantageously correspond to a plurality of contiguous lines produced by spraying the same first liquid composition using a spray head 17 with a rotating centrifugal disc 18.Advantageously, a line as defined by the invention thus has a width that is typically between 0.1 mm and 1 mm, and preferably between 0.2 mm and 0.6 mm, while a band as defined by the invention has a width that is typically strictly greater than 1 mm and that can, for example, be up to one or more centimeters (for example, 1.1 cm). In any event, the implementation of a first layer of the same first liquid composition, using a spray head 17 with a rotating centrifugal disc 18, which would homogeneously cover substantially the entire inner face 4 of the wall 2 of the glass container 1, or at least substantially the entire inner face 4 of the side wall 7 of the container 1, does not fall within the scope of the present invention.

[0031] It thus becomes possible, thanks to the process of the invention, to generate in a simple and efficient manner a new range of particularly aesthetic decorative effects, by playing in particular on the number, position, orientation and / or color of the line(s) 15 and / or band(s) 16 forming the pattern of the interior decorative coating 19. It is thus particularly conceivable to create a decorative coating interior 19 by applying, using only the spray head 17 with a rotating centrifugal disc 18, a first liquid composition of a given color and / or nature, or by applying, on the contrary, a plurality of first liquid compositions of different colors and / or natures, so as to obtain a pattern formed of a plurality of different lines 15 and / or bands 16. In the case of a plurality of lines 15 and / or bands 16, made from a single first liquid composition or from a plurality of different first liquid compositions, it is possible to ensure that the lines 15 and / or bands 16 are parallel to each other, or that they have different orientations and / or that they intersect.

[0032] The rotating centrifugal disc spray head 17 18 (or rotating disc spray head, or projection head) is a spraying device that is usually intended and used for applying coatings covering substantially the entire surface of an object. Thus, the invention is based here on a new way of implementing such a spraying device for applying an interior decorative coating 19 including a pattern with line(s) 15 and / or band(s) 16, and more specifically for decorating the interior of a container 1 with a translucent or transparent glass wall 2.The general operating principle of the spray head 17 with a rotating centrifugal disc 18 is typically as follows: the first liquid composition is injected and deposited onto the surface of the rotating centrifugal disc 18, typically via a tubular pole 20 at one end of which the spray head 17 is arranged. Under the effect of the rotation of the rotating centrifugal disc 18, the first liquid composition spreads over the surface of the rotating centrifugal disc 18 and is sprayed into fine droplets at the peripheral edge of the rotating centrifugal disc 18. Under the effect of the centrifugal force generated by the rotation of the rotating centrifugal disc 18, these droplets then describe rectilinear trajectories, in a substantially radial direction, around the rotating centrifugal disc 18.The advantage of such a rotating centrifugal disc 18 lies in the fact that the droplets are sprayed along average trajectories substantially inscribed in a plane PI of average extension of the rotating centrifugal disc 18, so that they are deposited in the form of a line on the surface of the inner face 4 of the wall 2 of the container 1. By modulating, in particular, the rotational speed of the rotating centrifugal disc 18, the feed rate of the spray head 17 of the first liquid composition, or even the viscosity of the latter, it has been observed that such a spray head 17 with a rotating centrifugal disc 18 allows the formation of a much sharper and better-defined line than with a conventional spray nozzle designed to spray a liquid in the form of a spray cone. Capable of projecting fine droplets of the first liquid composition, the spray head... The rotating centrifugal disc 18, 17, is advantageously designed and configured to spray said first liquid composition in the form of droplets with a size preferably between 10 µm and 50 µm. The rotating centrifugal disc 18 is preferably symmetrical, and / or preferably has a smooth peripheral edge.

[0033] According to one embodiment shown in the figures, the spray head 17 with a rotating centrifugal disc 18 is designed and configured to spray said first liquid composition at 360°. Advantageously, the spray head 17 is free of any cover or shield that would locally interpose itself between a peripheral edge of the rotating centrifugal disc 18 and the inner face 4 of the wall 2 of the container 1. According to this embodiment, it is thus possible to obtain one or more lines 15 and / or strips 16 closed upon themselves. According to another embodiment, the spray head 17 with a rotating centrifugal disc 18 can, on the contrary, be designed and configured to spray said first liquid composition over an angular portion of less than 360°.To this end, the spray head 17 may advantageously include a hood (or cover or mask) arranged to be interposed, at least locally, between the peripheral edge of the rotating centrifugal disk 18 and the inner face 4 of the wall 2 of the container 1. The hood is then designed and configured to define an angular portion of spraying with a desired value (and therefore less than 360°). For example, the spray head 17 may include a hood that externally encloses the rotating centrifugal disk 18, at least radially, and in which a spray slot of chosen dimensions is provided.In operation, the rotating centrifugal disc 18 thus sprays the first liquid composition radially through 360°, but only a portion of the first sprayed liquid composition passing through the spray slot reaches the surface of the inner face 4 of the wall 2 of the container 1, while the remainder of the first sprayed liquid composition is intercepted by the hood (and preferably collected for reuse). According to this variant, it is therefore possible to obtain one or more lines 15 and / or strips 16 that are not closed upon themselves.

[0034] Preferably, said first layer is applied directly to the bare glass of the inner face 4 of the wall 2 of the container 1. The first liquid composition is thus applied by spraying directly onto the glass, without an intermediate layer (or "undercoat"). However, it is alternatively conceivable that an intermediate layer (for example, an adhesion primer, a decorative layer, or any other surface treatment) be applied to the bare glass and that the first layer of the first liquid composition be applied over this intermediate layer. In such a case, however, an intermediate layer would then be provided at least locally translucent or transparent, so that the pattern remains at least partly visually perceptible from outside the container 1.

[0035] As will be discussed later, the first liquid composition may advantageously comprise a curable liquid base material and a coloring substance (pigment(s) and / or dye(s)), so that the first liquid composition is advantageously colored. Depending on the nature of the first liquid composition chosen, and in particular depending on the nature of the curable liquid base material it comprises, the curing step of the first layer of composition may advantageously include one or more operations of solidification by cooling, drying / desolvation, polymerization and / or crosslinking of said first liquid composition of the first layer applied to the inner face 4 of the wall 2 of the container 1.

[0036] Advantageously, and as schematically illustrated in example in [Fig.2], the step of applying the first layer 14 comprises the following successive operations: a) the rotating centrifugal disc 18 of the spray head 17 is positioned inside the cavity 3 of the container 1 in a predetermined relative position of the rotating centrifugal disc 18 and the container 1; b) the rotating centrifugal disc 18 is set in rotation, if the rotating centrifugal disc 18 is not already rotating; c) then the spray head 17 is supplied with first liquid composition for a predetermined time (for example for 2 s), the rotating centrifugal disc 18 being held positioned in said predetermined relative position, to form a line of first liquid composition on the inner face 4 of the wall 2 of the container 1.

[0037] Advantageously, said predetermined relative position corresponds, within the framework of operation a), to a given relative inclination of the rotating centrifugal disk 18 and the container 1 and to a predetermined altitude of the rotating centrifugal disk 18 inside the cavity 3 of the container 1 along the principal extension axis A-A' of the latter. By relative inclination of the rotating centrifugal disk 18 and the container 1, advantageously means a particular inclination of the average extension plane PI of the rotating centrifugal disk 18 with respect to the principal extension axis A-A' of the container 1. For the sake of simplicity, it is advantageous to provide that the container 1 is held stationary during the step of applying the first layer 14, while the spray head 17 is movable, typically translating along a translation direction B-B' parallel to or coinciding with the principal extension axis A-A' of the container 1.Regarding operation b), it is understood that this can be omitted if the rotating centrifugal disk 18 is already rotating. For example, the rotating centrifugal disk 18 can be set in rotation during operation a). This. This scenario is particularly advantageous as it accelerates the implementation of the decoration process, since operation c) can be initiated immediately after operation a). Since operation c) follows operation b), or at the very least, the rotation of the rotating centrifugal disc 18, the first composition is supplied to the spray head 17 during operation c) while the rotating centrifugal disc 18 is already in rotation. As a result, the first liquid composition is immediately sprayed towards the inner face 4 of the wall 2 of the container 1 after reaching the surface of the rotating centrifugal disc 18, thus limiting the risk of smears and uncontrolled spraying of droplets and contributing to excellent definition and sharpness of the first applied layer 14.Advantageously, the predefined duration of supplying the spray head 17 with the first composition is chosen according to the quantity of first liquid composition to be sprayed, and therefore in particular according to the thickness of the first layer 14 to be applied. It is further understood here that, for a first liquid composition of a given color, it is possible to form a more or less visible colored line 15 by modulating the quantity of first liquid composition sprayed.

[0038] Preferably, the first-coat application step 14 includes, after operation c), an operation d) during which the rotating centrifugal disc 18 is kept rotating for a predetermined time (for example, for 2 or 3 seconds), while still being held in said predetermined relative position, to wring out the rotating centrifugal disc 18 ([Fig. 3]). Performed once the predetermined time for supplying the spray head 17 with the first liquid composition has elapsed, i.e., once the supply of the first liquid composition has stopped, operation d) (or "wringing operation") advantageously aims to wring out, or purge, the rotating centrifugal disc 18 in order to limit the risk of unintentional dispersion of drops or droplets of the first liquid composition into the cavity 3 of the container 1 once the rotation of the rotating centrifugal disc 18 has stopped.

[0039] Advantageously, the step of applying the first coat 14 comprises, subsequent to operation c) and preferably after operation d), an operation e) in which the rotation of the rotating centrifugal disc 18 is stopped and the rotating centrifugal disc 18 is then removed from the spray head 17 out of the cavity 3 of the container 1 ([Fig. 3]). The rotation of the rotating centrifugal disc 18 is thus stopped before the rotating centrifugal disc 18 is extracted from the cavity 3 of the container 1. This advantageously prevents the unintentional spraying or falling into the cavity 3 of the container 1 of drops or droplets of the first liquid composition that might remain at the spray head 17, and This is despite the possible performance of operation d) mentioned above. Still with the aim of minimizing the risk of accidental spraying or falling of drops or droplets of the initial liquid composition, the first-coat application step may advantageously include, once the rotating centrifugal disc 18 of the spray head 17 has been removed from the cavity 3 of the container 1 (and preferably after the rotation of the rotating centrifugal disc 18 has been stopped during operation e) mentioned above), an operation f) of purging the spray head 17. Performing such a purging operation f) is particularly useful when the spray head 17 is intended to be used later for the application step of the process according to the invention on another container 1 to be decorated.Typically, said purging operation f) can be carried out by rotating the rotating centrifugal disc 18 without supplying the spray head 17 with the first liquid composition, and optionally by supplying the spray head 17 with a pressurized purging gas (or gas mixture).

[0040] The step of applying the first layer 14 as described above, with in particular its cycle of operations a), b), c), preferably d), preferably e), and preferably f), advantageously makes it possible to obtain in a simple, efficient and repeatable way a pattern formed of a line 15, or at least including a line 15, as in the example illustrated in [Fig.4].

[0041] If it is desired to obtain a pattern formed of, or comprising, a plurality of (distinct) lines 15 from the same initial liquid composition, the step of applying the first layer 14 may advantageously include a plurality of successive cycles of operations a), b), c), and preferably d), each new instance of operation a) corresponding to a different predetermined relative position of the rotating centrifugal disk 18 and the container 1 (and, for example, to a different altitude of the rotating centrifugal disk 18 inside the cavity 3 of the container 1). Once the desired number of successive cycles of operations a), b), c), and preferably d) have been performed, the step of applying the first layer 14 may then advantageously include an instance of operation e), followed preferably by an instance of operation f) of purging the spray head 17.It is thus possible, for example, to obtain a pattern formed of, or comprising, a "non-solid band" made up of a plurality of 15 distinct lines, juxtaposed parallel but not contiguous, from the same first liquid composition.

[0042] In the case where it is desired to obtain a pattern formed of, or comprising, lines 15 of different colors and / or materials, the step of applying the first layer 14 may then comprise a plurality of cycles of successive operations a), b), c), preferably d), preferably e), and preferably f). Each new instance of operation a) will then correspond to a predetermined relative position. different from the rotating centrifugal disc 18 and the container 1 (and for example at a different altitude of the rotating centrifugal disc 18 inside the cavity 3 of the container 1), each new instance of operation c) implementing a first liquid composition of a different color and / or nature. The first liquid composition(s) can then be sprayed using the same spray head 17 with rotating centrifugal disc 18 for each cycle, or conversely using a plurality of spray heads 17 with rotating centrifugal disc 18.

[0043] As already mentioned above, it is also possible to obtain using the decoration process according to the invention a pattern which is formed by or which includes, additionally or alternatively, one or more strip(s) 16, as in the example illustrated in [Fig.5].

[0044] According to one variant, it is possible to apply the first layer 14 of the first liquid composition in the form of a strip 16 to the surface of the inner face 4 of the wall of the container 1 by providing that the step of applying the first layer 14 includes, in place of operation c) described above, an operation c') in which the spray head 17 is supplied with the first liquid composition for a predetermined time, the rotating centrifugal disc 18 and the container 1 being progressively moved relative to each other from said predetermined relative position to another predetermined relative position, thus forming a strip 16 of the first liquid composition on the inner face 4 of the wall 2 of the container 1.Typically, these predetermined relative positions can correspond, for a given relative inclination of the rotating centrifugal disk 18 and the container 1, to two different altitudes of the rotating centrifugal disk 18 inside the cavity 3 of the container 1 along the principal extension axis A-A' of the latter. Thus, during operation c'), the rotating centrifugal disk 18 and the container 1 are moved relative to each other along the principal extension axis A-A' of the container 1 between two different altitudes of the rotating centrifugal disk 18 inside the cavity 3 of the container 1, so as to continuously spray the first liquid composition and thus form a band 16 whose width is defined as a function of the difference between these altitudes.Operations a), b), and, where applicable, operations d), e) and / or f) then remain advantageously identical to the description given above, except that operation d) then corresponds to an operation d') during which the rotating centrifugal disk 18 is still kept in rotation for a predefined time (for example for 2 s or 3 s), while still being held positioned in said other predetermined relative position, to wring out the rotating centrifugal disk 18. However, to obtain a particularly sharp and well-defined strip 16 according to this variant, it may be necessary to implement a relative displacement of the rotating centrifugal disk 18. and of container 1 very slowly, and therefore at a speed potentially incompatible with an industrial production of decorated containers, in particular to limit a risk of undesirable parasitic misting of the first liquid composition under the effect of the relative displacement.

[0045] Therefore, according to another variant for forming a band 16 on the surface of the inner face 4 of the wall of the container 1, it may be more advantageous to provide that the step of applying the first layer 14 includes - in addition to operations a), b) and c) previously described for the production of line(s) 15 and subsequent to operation c), and preferably at the end of operation d) if applicable - at least one instance of an operational sequence during which: - the rotating centrifugal disc 18 is moved from the spray head 17 and / or the container 1 in order to position the rotating centrifugal disc 18 inside the cavity 3 of the container 1 in another predetermined relative position of the rotating centrifugal disc 18 and the container 1, - then we repeat said operations a), b), c), and preferably also d), for said other predetermined relative position, to form another line of first liquid composition on the inner face 4 of the wall 2 of the container 1.

[0046] Said other predetermined relative position is then chosen such that said other line thus formed is contiguous to at least one previously formed line (and preferably without this other line being entirely superimposed on a previously formed line). According to this embodiment, a band 16 is therefore advantageously formed sequentially, incrementally, in the form of a plurality of contiguous lines made from the same initial liquid composition, and not continuously by scanning the surface of the inner face 4 of the wall 2 of the container 1, as in the case of the embodiment described above. Depending on the number of instances of said operational sequence, and therefore the number of contiguous lines formed, it is thus possible to form a band 16 of varying width.

[0047] Typically, the displacement of the rotating centrifugal disc 18 of the spray head 17 and / or the container 1 can consist, for a given relative inclination of the rotating centrifugal disc 18 and the container 1, of a translation of the rotating centrifugal disc 18 and the container 1 relative to each other along the main extension axis A-A' of the container 1 between two different altitudes of the rotating centrifugal disc 18 inside the cavity 3 of the container 1, for example in increments of 0.5 mm. Thus, said predetermined relative positions can correspond to two different altitudes of the rotating centrifugal disc 18 inside the cavity 3 of the container 1 along the main extension axis A-A' of the latter. It is also possible to provide that the rotational speed of the rotating centrifugal disc 18 and / or the predefined duration of supply of the spray head 17 be different between two successive instances, so as to create a visual gradient effect between the contiguous lines constituting a band 16.

[0048] Advantageously, the step of applying the first layer 14 includes, subsequent to the last of operations c), the operation e) already described above in which the rotation of the rotating centrifugal disc 18 is stopped and then the rotating centrifugal disc 18 is removed from the spray head 17 out of the cavity 3 of the container 1. Advantageously, the step of applying the first layer 14 may further include, once the rotating centrifugal disc 18 of the spray head 17 has been removed from the cavity 3 of the container 1 (and preferably after the rotation of the rotating centrifugal disc 18 has been stopped during the operation e) above), the operation f) of purging the spray head 17 already described above.

[0049] As previously described in the case of a pattern formed of line(s) 15, it is perfectly conceivable to obtain a pattern formed of, or comprising, a plurality of (distinct) bands 16 of the same color and / or nature, or of different colors and / or natures, by repeating the operations and operational sequence described above using the same initial liquid composition or initial liquid compositions of different colors and / or natures. It is understood that it is also obviously possible to obtain a pattern formed of both one or more lines 15 and one or more bands 16, which line(s) and band(s) may or may not be of the same color and / or nature.

[0050] Advantageously, the first liquid composition contains a sol intended to (i.e., formulated to, designed to) form a solid material by sol-gel process (or "sol-gel material"), i.e., according to a sol-gel synthesis process. The first liquid composition thus advantageously forms a substantially homogeneous liquid mixture containing at least one sol, as a curable liquid base material, and preferably at least one coloring substance (pigment(s) and / or dye(s)). In other words, the first liquid composition is then a composition at least partly based on sol-gel. Sol-gel processes are well known as such, so it is not necessary to describe in more detail here the reaction mechanisms they employ. Preferably, this sol comprises a silica precursor.

[0051] In this case, the hardening step of the first layer 14 advantageously aims to finalize the gelation of the soil, if necessary, and then to dry the gel thus obtained, in order to obtain a solid sol-gel material advantageously forming all or part of a matrix of the hardened first layer 14. For this purpose, the hardening step of the first layer 14 may include a baking operation (by (for example, in a drying oven or furnace) the container 1 thus coated with the first layer 14, at a temperature and for a time sufficient to properly harden the applied first layer 14. The temperature and baking time obviously depend on the dimensions of the container 1, the thickness of the first layer 14 applied to the inner face 4 of its wall 2, and the nature of the first liquid composition used. For example, the baking operation of the first layer 14 may consist of placing the container 1 thus coated with the first layer 14 in a drying oven at a temperature between 120 °C and 200 °C, for a sufficient baking time, for example, 90 minutes at a baking temperature of 145 °C.

[0052] The addition of a ground, in varying quantities, to the initial liquid composition advantageously allows for obtaining, after the hardening step of the first layer 14, a hardened first layer 14 that exhibits excellent physicochemical resistance, particularly against aggressive products such as, in particular, a cosmetic product made from an alcoholic liquid. An interior decorative coating 19 formed by, or at least comprising, such a hardened first layer 14 can therefore advantageously be placed in direct contact with the product that the cavity 3 of the container 1 is intended to receive. Furthermore, the addition of a ground allows for obtaining a hardened first layer 14 that exhibits excellent adhesion to the inner face 4 of the wall 2, particularly when the first layer 14 is applied directly to said inner face 4.This leads to the production of a robust, decorated container 1, whose interior decorative coating 19 does not disintegrate with use. However, the invention is not limited to the implementation of a first liquid composition containing a ground, and it is entirely conceivable that the first liquid composition could contain another suitable curable liquid base material, such as a lacquer or a synthetic organic resin. In this case, the curing step of the first layer 14 may generally include polymerization and / or crosslinking and / or drying and / or desolvation of said curable liquid base material.

[0053] Preferably, during the application step of the first layer 14, the spray head 17 with a rotating centrifugal disc 18 is supplied with the first liquid composition at a flow rate substantially between 2 ml / h and 10 ml / h (milliliters per hour), and even more preferably between 3 ml / h and 7 ml / h. Choosing such a flow rate advantageously allows the first liquid composition to be sprayed in a particularly uniform and regular manner. The flow rate can be chosen differently, within the ranges preferably mentioned above, depending on whether a line 15 or a band 16 is desired, and depending on the viscosity of the first liquid composition. Preferably, the spray head 17 is supplied with the first composition using A peristaltic pump (not shown) allows for particularly fine and consistent control of the flow rate of the initial liquid composition. Advantageously, such a peristaltic pump comprises a head, for example circular, inside which is arranged a flexible tube through which the fluid to be pumped (here, the initial liquid composition) flows. The flexible tube is deformed by a rotor equipped with rollers, which compress it against the circular head to drive the fluid forward. Advantageously, the internal diameter of the flexible tube is chosen to be less than or equal to 1 mm, for example, 0.5 mm. Preferably, the peristaltic pump can be set to a frequency between 0.3 and 1 kHz, even more preferably between 0.4 and 0.6 kHz, for example, a frequency of 0.58 kHz for an internal diameter of 0.5 mm in the flexible tube.

[0054] Advantageously, the rotational speed of the rotating centrifugal disc 18 during the application step of the first layer 14 (and in particular during operation c) mentioned above) is chosen to be less than or equal to 60,000 rpm (revolutions per minute), and even more advantageously equal to approximately 40,000 rpm. Indeed, it has been observed that an excessively high rotational speed of the rotating centrifugal disc 18 is likely to cause an undesirable misting phenomenon of the first liquid composition, which is detrimental to the sharpness of the line(s) 15 and / or band(s) 16 formed.

[0055] It has been observed that the viscosity of the first liquid composition can influence the ease of application of the first coat 14, as well as the quality of the resulting interior decorative coating 19. Indeed, a very low viscosity of the first liquid composition can promote unwanted misting of the first liquid composition inside the cavity 3 of the container 1, which impairs the definition and sharpness of the pattern formed. Conversely, an excessively high viscosity of the first liquid composition is likely to lead to a lack of regularity and homogeneity in its spraying, or even undesirable heating and / or clogging of the spray head 17.It is therefore advantageous for the first liquid composition to have a viscosity between 14 ± 3 s and 35 ± 8 s, and preferably equal to 20 ± 5 s (seconds), measured using a kinematic viscosity measuring cup according to AFNOR No. 4 (standardized measuring cup, whose flow orifice has a diameter of 4 mm, according to the flow stop method). This advantageously corresponds to a viscosity between approximately 31 cSt and approximately 69 cSt (centistokes).

[0056] Advantageously, the method for decorating the container 1 may further comprise, after the step of applying the first layer 14: - a step of applying, on the inner face 4 of the wall 2 of the container 1, a second layer 21 of a second liquid composition, said second layer 21 being applied so as to overlap at least part of said first layer 14; and - a hardening step of the second layer 21 to form said interior decorative coating 19 including said pattern.

[0057] The interior decorative coating 19 obtained using the decoration process according to the invention is therefore, in this case, a multilayer coating comprising said first and second layers 14, 21, the first layer 14 defining said pattern, the second layer 21 overlapping at least part of the first layer 14 so as to extend beyond the latter. The line(s) 15 and / or band(s) 16 of the pattern formed by applying the first layer 14 are thus covered by the second layer 21, which extends on either side of said line(s) and / or band(s). Non-limiting examples of decorated containers 1 that can be obtained in this way are illustrated in [Fig. 4] where the pattern is formed by a line 15, and in [Fig. 5] where the pattern is formed by a band 16.

[0058] It should be noted here that the terms "first" and "second" are used in this description of the invention simply as qualifying adjectives to avoid any confusion between the applied layers and their respective corresponding liquid compositions. The use of the terms "first" and "second" therefore does not imply any particular technical limitation of the invention. In particular, the use of the term "first" does not necessarily imply the existence of associated items of a higher order or rank. The first layer 14 and the first liquid composition(s) can, moreover, be referred to herein as "base layer" 14 and "base liquid composition(s)," respectively, while the second layer 21 and the second liquid composition can be referred to as "top layer" 21 and "top liquid composition(s)," respectively.

[0059] The application step of said second layer 21 can be carried out in any known and suitable manner, for example using a conventional spray nozzle (or decorating gun) inserted into the cavity 3 of the container 1 and supplied with a second liquid composition. For example, said spray nozzle can be a spray nozzle designed and configured to project a lateral jet of fine droplets in the form of a spray cone towards the inner face 4 of the wall 2 of the container 1. Obviously, the second liquid composition intended to form the second layer 21 is chosen to be different from the liquid composition(s) intended to form the first layer 14, so that the second layer 21 does not obstruct the visibility of the pattern of the first layer 14 through the transparent or translucent wall 2 of the container 1.

[0060] Said second layer 21, or cover layer, can advantageously play a protective role for the first layer 21 which it covers at least partially and / or contribute to the decorative effect of the interior decorative coating 19.

[0061] Preferably, the second layer 21 is applied so as to substantially completely cover the inner face 4 of the wall 2 of the container 1. Thus, the first layer 14 and the pattern it defines are completely covered by the second layer 21, which also extends so as to cover all the remaining surface of the inner face 4 of the wall 2 of the container 1 that is not already covered by the first layer 14. Such complete coverage makes it possible, in particular, to best protect the first layer 14 against the risk of detachment, or delamination, of the latter from the inner face 4 of the wall 2 of the container 1, for example under the action of infiltration of the product contained in the cavity 3 between the first layer 14 and the surface of said inner face 4.Such complete coverage also makes it possible to best protect the second layer 21 itself against a similar risk of detachment, for example under the action of an infiltration of the product contained in the cavity 3 between the first and second layers 14, 21 and / or between the second layer 21 and the surface of the inner face 4 of the wall 2 of the container 1. .

[0062] According to an embodiment in which the second layer 21 is intended to contribute to the decorative effect, the first and second liquid compositions are colored compositions of different colors. Advantageously, the first and second liquid compositions each contain, in addition to a hardenable liquid base material (which may or may not be identical), at least one different coloring substance (dye and / or pigment). Depending on the choice of colors, it is thus advantageously possible to obtain particular aesthetic effects, for example, highlighting the pattern with lines 15 and / or bands 16 defined by the first layer 14 by means of a contrast effect between the respective colors of the first and second liquid compositions applied.According to another variant in which the second layer 21 is intended to contribute to the decorative effect of the interior decorative coating 19, it is conceivable that the first liquid composition(s) used for the first layer 14 is / are, on the contrary, colorless, and therefore substantially transparent or translucent, while the second liquid composition is a colored composition. The pattern with line(s) 15 and / or band(s) 16 defined by the first layer 14 is then advantageously likely to appear by visual distortion of the appearance of the second layer 21 when the interior decorative coating 19 is seen through the wall 2 of the container 1.

[0063] According to yet another variant, in which the second layer 21 is not intended this time to contribute to the decorative effect but solely to protect the The first layer 14, the first liquid composition(s) used for the first layer 14 is / are colored, while the second liquid composition is colorless. The decorative effect of the interior decorative coating 19 is then generated by the single pattern of lines 15 and / or bands 16 defined by the first layer 14, visible through the wall 2 of the container 1, the second layer 21 remaining essentially invisible when the interior decorative coating 19 is viewed through the wall 2 of the container 1.

[0064] It is also possible to provide the container 1 thus coated by the first layer 14 and optionally the second layer 21 with an inner pocket (for example made of plastic) which has its own mechanical strength and is positioned inside the container 1, in the cavity 3, so that said first and second layers 14, 21 are interposed between the inner pocket and the wall 2. The inner pocket thus inserted into the container 1 is intended to receive within it the cosmetic product intended to be contained by the container 1. This makes it possible to avoid direct contact between said cosmetic product and said layer(s) 14, 21, thus protecting the latter.

[0065] Preferably, the second liquid composition (colored or not) contains a sol intended to (i.e., formulated for, designed to) form a solid material by sol-gel process (or "sol-gel material"), i.e., according to a sol-gel synthesis process. The second liquid composition thus advantageously forms a substantially homogeneous liquid mixture containing at least one sol, as a curable liquid base material, and optionally at least one coloring substance (pigment(s) and / or dye(s)). In other words, the second liquid composition is then a composition at least partly based on sol-gel. Preferably, it is a sol comprising a silica precursor.The addition of a ground, in varying quantities, to the second liquid composition advantageously results, after the hardening stage of the second layer 21, in a hardened second layer 21 exhibiting excellent physicochemical resistance, particularly to aggressive products such as cosmetics containing alcohol. An interior decorative coating 19 incorporating such a hardened second layer 21 can therefore be advantageously placed in direct contact with the product intended for the cavity 3 of the container 1. Furthermore, the addition of a ground allows for a hardened second layer 21 with excellent adhesion to the inner face 4 of the wall 2.Moreover, this improves the adhesion of the second layer 21 to the first layer 14 when the first liquid composition used for the latter itself contains a sol intended to form a solid material via a sol-gel reaction, as previously considered. This thus contributes to obtaining a container. 1. A particularly robust decorative coating 19 does not disintegrate with use. The hardening step of the second layer 21 advantageously aims in this case to finalize the gelation of the ground, if necessary, and then to dry the resulting gel, in order to obtain a solid sol-gel material advantageously forming all or part of a matrix of the hardened second layer 21. However, the invention is not limited to the implementation of a second liquid composition containing a ground, and it is entirely conceivable that the second liquid composition could contain another suitable hardenable liquid base material, such as, for example, a lacquer or a synthetic organic resin. In this case, the hardening step of the second layer 21 may generally consist of polymerization and / or crosslinking and / or drying and / or desolvation of said hardenable liquid base material.

[0066] Advantageously, the hardening steps of the first and second layers are carried out simultaneously. In other words, the second layer of the second liquid composition is applied while the first layer of the first liquid composition(s) is still wet, having not yet hardened. The hardening step of the first layer and the hardening step of the second layer are then carried out simultaneously, once the application step of the second layer is complete. This simplifies and speeds up the implementation of the decoration process. Implementing such simultaneous hardening steps proves all the more advantageous and straightforward when the hardenable liquid base materials of the first and second liquid compositions are chosen to be similar, if not identical (for example, both the first and second liquid compositions must contain a base).Indeed, the hardening stages of the first and second layers 14, 21 can then be advantageously combined.

[0067] In the case where the hardening steps of the first and second layers are carried out simultaneously, it may be advantageous to provide that the decoration process includes a preheating step of the glass wall 2 of the container 1, to a temperature (above ambient temperature) preferably between 50 °C and 70 °C (for example equal to 60 °C), prior to the application step of the first layer 14. Indeed, such preheating of the glass wall 2 can advantageously make it possible to "set" the first liquid composition sprayed on the inner face 4 of the wall 2 of the container 1, so as to prevent the pattern defined by the first layer 14 from deforming, spreading, under the effect of the subsequent application of the second layer 21 of the second liquid composition, which could be detrimental to the visual appearance of said pattern.In addition or alternatively, for the same purposes, a pre-hardening step of the first layer 14 could be provided, in order to "fix" the latter, before. the application of the second layer. Such a pre-curing step can, for example, be carried out by passing the container 1 through a heating tunnel (hot air, infrared, etc.). Optionally, the decoration process could include such a preheating step for the glass wall 2 of the container 1, at a temperature (above ambient temperature) preferably between 50 °C and 70 °C (for example, 60 °C), prior to the application of the first layer 14, even if a second layer application step 21 is not implemented. Indeed, this can prove advantageous, particularly in the case of creating a band 16, to limit the risk of deformation (burring) of the band 16 during its formation under the effect of gravity.

[0068] The invention also relates, as such, to a decoration installation for a container 1 as already described above, that is to say, a container 1 having a glass wall 2 delimiting a cavity 3 within which the container 1 is intended to contain a product, which wall 2 is translucent or transparent and has an inner face 4 located opposite said cavity 3. Comprising at least one spray head 17 with a rotating centrifugal disc 18, which advantageously conforms to the description given above, the installation according to the invention is designed and configured to implement the decoration process according to the invention, as the latter has been described above.

[0069] More specifically, the decoration installation includes an application device for applying, to the inner face 4 of the wall 2 of the container 1, at least one first layer 14 of at least one first liquid composition, as previously described. An embodiment of the application device for said first layer 14 is schematically illustrated as an example in [Fig. 6].Intended to implement the application step of the first layer 14 of the process according to the invention, said application device comprises said spray head 17 with rotating centrifugal disc 18, and it is designed and configured to introduce the latter into the cavity 3 of the container 1, and to apply said first liquid composition, using said spray head 17 with rotating centrifugal disc 18, according to a pattern formed of one or more line(s) 15 and / or band(s) 16, as explained previously in connection with the decoration process according to the invention.

[0070] The decoration installation further includes a curing device (not shown) for curing the first layer 14 thus applied, and thereby forming an interior decorative coating 19 including said pattern, in accordance with the explanations already given above. Said curing device is intended to carry out the curing step of the first layer 14 of the process according to the invention.

[0071] Advantageously, the first-coat application device 14 is designed and configured to perform all or part of the operations and operational sequence (or at least to enable their performance) described above in the decoration process. In particular, the first-coat application device 14 is advantageously designed and configured to position the rotating centrifugal disc 18 of the spray head 17 inside the cavity 3 of the container 1 in a predetermined relative position of the rotating centrifugal disc 18 and the container 1, and preferably also to subsequently move the rotating centrifugal disc 18 of the spray head 17 and / or the container 1 in order to position the rotating centrifugal disc 18 inside the cavity 3 of the container 1 in another predetermined relative position of the rotating centrifugal disc 18 and the container 1.Furthermore, the first-coat application device 14 is advantageously designed and configured to control the starting and stopping of the rotation of the rotating centrifugal disc 18, preferably at a rotational speed of 60,000 rpm or less, and preferably around 40,000 rpm. In addition, the first-coat application device 14 is designed and configured to supply the spray head 17 with the first liquid composition for a predetermined duration, and then to stop supplying the spray head 17. Accordingly, the first-coat application device 14 includes a supply source (not shown) for the first liquid composition, connected via fluidic communication to the spray head 17 with the rotating centrifugal disc 18.Advantageously, the decoration installation (and more specifically the first-coat application device 14) includes a peristaltic pump (not shown) connected to the spray head 17 to supply the latter with the first liquid composition, for the aforementioned advantages of using such a pump within the scope of the invention. As already described above in its design and operating principles, the peristaltic pump is typically connected at its inlet via fluidic communication with the first liquid composition supply source, and is connected at its outlet via fluidic communication with the spray head 17. Of course, it remains possible to use another known and suitable type of pump to supply the spray head 17 with a chosen quantity and / or at a chosen flow rate of the first liquid composition.

[0072] Advantageously, the first layer application device 14 includes a control unit (not shown) for controlling the execution, preferably in an automated manner, of all or part of the operations and operational sequence described above of the decoration process, and their possible repetition.

[0073] As schematically illustrated in example in [Fig. 6], the decoration installation (and more specifically the first-coat application device 14) comprises preferably a tubular pole 20, which extends longitudinally in a mean extension direction C-C', and at one end of which is arranged the spray head 17 with a rotating centrifugal disc 18. The decoration installation (and more specifically the first coat application device 14) advantageously includes a support 22 for holding the container 1, preferably stationary relative to the ground, at least for the time required to apply the first coat 14 of the first liquid composition, using said first coat application device 14. Preferably, the support 22 is designed to self-center the container 1 and thus hold the latter in position, which in particular prevents the rotating centrifugal disc 18 from coming into unintentional contact with the ring 13, especially if the container 1 is rotated.Advantageously, said first-layer application device 14 includes a gantry or frame 23 (or an arm), to which the tubular pole 20 is attached, and an actuator (such as a jack, not shown) for moving the frame 23 and the tubular pole 20 in translation along a translation direction B-B' which is preferably parallel or coincident with the average extension direction C-C' of the tubular pole 20, and for positioning the rotating centrifugal disc 18 inside the cavity 3 of the container 1 held by the support 22, in a predetermined relative position of the rotating centrifugal disc 18 and the container 1.Typically, said predetermined relative position can thus correspond to a given relative inclination of the rotating centrifugal disc 18 and the container 1 and to a predetermined altitude of the rotating centrifugal disc 18 inside the cavity 3 of the container 1 along the principal extension axis A-A' of the latter. Said given altitude can then be reached by a translational movement of the tubular pole 20 carrying the spray head 17 with rotating centrifugal disc 18 along said translational direction B-B' (as indicated by a double arrow in [Fig. 6]), said first-coat application device 14 being advantageously designed so that said translational direction B-B' is parallel or coincident with the principal extension axis A-A' of the container 1.

[0074] Preferably, the rotating centrifugal disk 18 is tiltable relative to the tubular pole 20. This makes it possible to modify an angle of inclination α between the average extension direction C-C' of the tubular pole 20 and the average extension plane PI of the rotating centrifugal disk 18. Complementarily or alternatively, the support 22 of the container 1 may be provided to be tiltable relative to the tubular pole 20. This makes it possible to modify an angle of inclination θ3 between the average extension direction C-C' of the tubular pole 20 and a support plane P2 of the container 1 by said support 22 (the maximum value of the angle of inclination θ3 being dependent on the diameter of the opening 8 of the container 1). Thus, one and / or the other of the predetermined relative positions of the rotating centrifugal disk 18 and of the container 1 mentioned above can correspond, in addition to a given altitude of the rotating centrifugal disk 18 in the cavity 3 of the container 1, to a particular inclination of the plane PI of average extension of the rotating centrifugal disk 18 with respect to the main extension axis A-A' of the container 1. This particular inclination can be advantageously modified by a modification of the angle of inclination a between the average extension direction C-C' of the tubular pole 20 and the plane PI of average extension of the rotating centrifugal disk 18, or by a modification of the angle of inclination [3 between the average extension direction C-C' of the tubular pole 20 and a support plane P2 of the container 1, or even by a combined modification of these two angles of inclination a, [3.It is understood that it is thus possible to form a pattern comprising one or more line(s) 15 and / or band(s) 16 which extend obliquely with respect to the main extension axis A-A' of the container 1 (and not only orthogonally as in the examples illustrated in the figures).

[0075] Preferably, in order to implement the corresponding additional steps of the decoration process described above (or at least to allow their implementation), the decoration installation further comprises: - an application device designed and configured to apply to the inner face 4 of the wall 2 of the container 1, a second layer 21 of a second liquid composition, such that said second layer 21 overflows at least part of the first layer 14 previously applied; and - a hardening device for hardening the second layer 21 and thus forming said interior decorative coating 19 including said pattern.

[0076] Typically, the device for applying the second coat 21 may include a conventional spray nozzle (or decorating gun), suitable for insertion into the cavity 3 of the container 1, and a supply of the second liquid composition to the spray nozzle. For example, said spray nozzle may be a spray nozzle designed and configured to project a lateral jet of fine droplets in the form of a spray cone towards the inner face 4 of the wall 2 of the container 1. Preferably, the device for applying the second coat 21 is designed and configured to apply the second coat 21 so that it substantially completely covers the inner face 4 of the wall 2 of the container 1. The device for curing the second coat 21 may be of any known type suitable for the nature of the second liquid composition.

[0077] Advantageously, in order to simplify the design of the installation and the breakdown of the decoration process using the latter, the first-layer curing device 14 and the second-layer curing device 21 are designed and configured to simultaneously cure said first and second Layers 14 and 21 are applied after the second layer 21 has been applied over the first layer 14, the latter not yet having hardened. Advantageously, the hardening device for the first layer 14 and the hardening device for the second layer 21 are combined. They thus form a single hardening device, which simplifies the design and implementation of the decorative installation and reduces its footprint.

[0078] Advantageously, the decoration installation may include a device for preheating the glass wall 2 of the container 1 to bring said wall 2 to a temperature preferably between 50 °C and 70 °C (for example to 60 °C) prior to the application of the first layer 14 by the device for applying said first layer 14.

[0079] The invention further relates, as such, to a container 1 having a glass wall 2 delimiting a cavity 3 within which the container 1 is intended to contain a product, said wall 2 being translucent or transparent and having an inner face 4 facing said cavity 3, which inner face 4 is provided with an internal decorative coating 19 including a pattern formed (or at least comprising) of one or more lines 15 and / or bands 16. The container 1 according to the invention, or "decorated container," can be obtained by the decoration process according to the invention described in detail above, and preferably is obtained directly by this decoration process. Consequently, the preceding description concerning the decoration process (and / or the corresponding decoration installation) also applies in full to the container 1 or "decorated container."Preferably, the container 1 is intended to hold a liquid, viscous or pasty cosmetic product in said cavity 3, in particular a cosmetic product formed by an alcoholic liquid such as a body perfume. Two examples of embodiments of a container 1 according to the invention, which here more specifically constitutes a bottle, a vial or a flask, are illustrated by way of example in Figures 4 and 5.

[0080] Advantageously, as illustrated in examples in Figures 4 and 5, the interior decorative coating 19 is a multilayer coating comprising a first coating layer 14 that defines said pattern, and a second coating layer 21 that overlaps at least a portion of said first coating layer 14. According to one embodiment, the first and second coating layers 14, 21 of the interior decorative coating 19 are colored and of different colors (Figures 4 and 5). According to another embodiment, the first coating layer 14 is colorless, while the second coating layer 21 is colored. According to yet another embodiment, the first coating layer 14 is colored, while the second coating layer 21 is colorless.

[0081] Preferably, the interior decorative coating 19 of the container 1 comprises a solid material (or "sol-gel material", hybrid or not) produced by a sol-gel process, preferably silica-based, at least in the outermost of its first and second coating layers 14, 21. As explained previously in connection with the decoration process, the presence of such a sol-gel material gives the interior decorative coating 19 excellent physicochemical resistance, particularly to aggressive products, such as a cosmetic product made from an alcoholic liquid. The interior decorative coating 19 can therefore advantageously come into direct contact with the cosmetic product without risk of it disintegrating during use.

Claims

Demands

1. A method for decorating a container (1) having a glass wall (2) delimiting a cavity (3) within which the container (1) is intended to contain a product, said wall (3) being translucent or transparent and having an inner face (4) situated opposite said cavity (3), the method being characterized in that it comprises: • a step of applying, on the inner face (4) of the wall (2) of the container (1), at least one first layer (14) of at least one first liquid composition, said first liquid composition being applied in a pattern formed of one or more line(s) (15) and / or band(s) (16) using a spray head (17) with a rotating centrifugal disc (18) introduced inside said cavity (3), and • a step of hardening the first layer (14) to form an internal decorative coating (19) including said pattern.

2. A method according to the preceding claim, characterized in that the step of applying the first layer (14) comprises the following successive operations: a) the rotating centrifugal disc (18) of the spray head (17) is positioned inside the cavity (3) of the container (1) in a predetermined relative position of the rotating centrifugal disc (18) and the container (1); b) the rotating centrifugal disc (18) is set in rotation, if the rotating centrifugal disc (18) is not already rotating; c) then the spray head (17) is supplied with first liquid composition for a predetermined time, the rotating centrifugal disc (18) being held positioned in said predetermined relative position, to form a line of first liquid composition on the inner face (4) of the wall (2) of the container (1).

3. A method according to the preceding claim, characterized in that the step of applying the first layer (14) comprises, after operation c), an operation d) during which the rotating centrifugal disk (18) is still kept rotating for a predetermined duration, while always being maintained positioned in said predetermined relative position.

4. A method according to any one of claims 2 and 3, characterized in that the step of applying the first layer (14) comprises, subsequent to operation c) and preferably after operation d), at least one instance of an operational sequence during which: • the rotating centrifugal disc (18) is moved from the spray head (17) and / or the container (1) in order to position the rotating centrifugal disc (18) inside the cavity (3) of the container (1) in another predetermined relative position of the rotating centrifugal disc (18) and the container (1), • then operations a), b), c), and preferably also d), are repeated for said other predetermined relative position, to form another line of first liquid composition on the inner face (4) of the wall (2) of the container (1),said other predetermined relative position being chosen such that said other line thus formed is contiguous to at least one previously formed line.

5. A method according to any one of claims 2 to 4, characterized in that the step of applying the first layer (14) comprises, subsequent to operation c) or the last of operations c), an operation e) in which the rotation of the rotating centrifugal disc (18) is stopped and then the rotating centrifugal disc (18) is removed from the cavity (3) of the container (1).

6. A method according to any one of the preceding claims, characterized in that said first layer is applied directly to the bare glass of the inner face (4) of the wall (2) of the container (1).

7. A method according to any one of the preceding claims, characterized in that, during the first layer application step (14), the rotating centrifugal disc spray head (17) (18) is supplied with first liquid composition at a flow rate of between 2 ml / h and 10 ml / h, preferably between 3 ml / h and 7 ml / h.

8. A method according to any one of the preceding claims, characterized in that said first liquid composition has a viscosity between 14+3 s and 35 +8 s, and preferably equal to 20 ± 5 s, measured using a kinematic viscosity measuring cup according to AFNOR No.

4.

9. A process according to any one of the preceding claims, characterized in that the first liquid composition contains a sol intended to form a solid material by sol-gel process.

10. A method according to any one of the preceding claims, characterized in that it further comprises, subsequent to the step of applying the first layer (14): • a step of applying, on the inner face (4) of the wall (2) of the container (1), a second layer (21) of a second liquid composition, said second layer (21) being applied so as to overhang at least a part of said first layer (14); and • a step of hardening the second layer (21) to form said internal decorative coating (19) including said pattern.

11. Method according to the preceding claim, characterized in that the second layer (21) is applied so as to substantially cover the inner face (4) of the wall (2) of the container (1).

12. A process according to any one of claims 10 and 11, characterized in that the second liquid composition contains a sol intended to form a solid material by sol-gel method.

13. A method according to any one of claims 10 to 12, characterized in that the first and second liquid compositions are colored compositions of different colors.

14. A method according to any one of claims 10 to 13, characterized in that the hardening steps of the first layer (14) and the second layer (21) are carried out simultaneously.

15. A method according to any one of the preceding claims, characterized in that it comprises a step of preheating the glass wall (2) of the container (1) to a temperature preferably between 50 °C and 70 °C, prior to the first layer application step (14).

16. Installation for decorating a container (1) having a glass wall (2) delimiting a cavity (3) within which the container (1) is intended to contain a product, said wall (2) being translucent or transparent and having an inner face (4) situated opposite said cavity (3), said installation being characterized in that it comprises a spray head (17) with a rotating centrifugal disc (18) and is designed and configured to implement a decorating process according to any one of claims 1 to 15.

17. Decoration installation according to the preceding claim, characterized in that it comprises a tubular pole (20) at one end of which is arranged the spray head (17), the rotating centrifugal disc (18) being preferably tiltable relative to the tubular pole (20).

18. Decoration installation according to the preceding claim, characterized in that it comprises a support (22) for holding the container, preferably in a fixed position relative to the ground, said support (22) being preferably tiltable relative to the tubular pole (20).

19. A decoration installation according to any one of claims 16 to 18, characterized in that it comprises a peristaltic pump connected to the spray head (17) to supply the latter with the first liquid composition.

20. Container (1) having a glass wall (2) delimiting a cavity (3) within which the container (1) is intended to contain a product, said wall (2) being translucent or transparent and having an inner face (4) situated opposite said cavity (3), said container (1) being characterized in that said inner face (4) is provided with an internal decorative coating (19) including a pattern formed of one or more line(s) (15) and / or band(s) (16).

21. Container (1) according to the preceding claim, characterized in that the interior decorative coating (19) is a multilayer coating comprising: 31 • a first coating layer (14) which defines said pattern, and • a second coating layer (21), which overlaps at least part of said first coating layer (14).

22. Container (1) according to the preceding claim, characterized in that the first and second coating layers (14, 21) are colored and of different colors.

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