FR2655756A1 - Display panel; method of fixing and removing a poster glued onto such a panel and support for at least one such panel - Google Patents

Abstract

The present invention relates to display by gluing on a substantially rigid panel, by means of a glue which is reversible by means of a solvent. The panel (1) is permeable to the said glue and to the said solvent, between its front face (6) and its reverse face (7), in a way substantially distributed over the whole of the respective extent of the latter, either because it consists of a flexible, isotropic, substantially inextensible assembly (22) of intersecting wires defining meshes (25) between them, this assembly (22) being stretched on a rigid frame (11), or because it is produced in the form of a homogeneous, flexible, isotropic, substantially inextensible sheet (20), given a multitude of perforations (21) also stretched on a rigid frame (11), or because it is produced in the form of a homogeneous plate, inherently substantially rigid, given a multitude of perforations. Such a panel makes it possible to enhance the anchoring of the poster, facilitates unbonding by allowing application of the solvent by the reverse of the panel, and can be produced in a sufficiently light form to allow the gluing and ungluing of the posters to be performed in the workshop, thus limiting on-site attention to a minimum.

Description

I The present invention relates to a display panel, of the type

  substantially rigid, having a front intended to receive a poster by gluing by means of a reversible glue and to authorize the take-off of the poster by means of a solvent of said glue, as well as a method of installation and removal of '' a poster stuck by means of a reversible adhesive on the front of such a panel, and a support for at least one such panel when the latter has two rectilinear edges, mutually parallel, intended

  to be oriented substantially vertically.

  The present invention relates more particularly to outdoor display, it being understood that it could also find

  its application in sheltered display.

  A widely used display technique consists of manually sticking a paper poster, possibly formed of a juxtaposition of several elements, on a rigid and heavy panel, for example made of sheet steel, wood or more rarely polyester, placed irremovable on the exhibition site; for this purpose, an adhesive is applied, generally consisting of a colloidal aqueous solution of starch or cellulose derivatives, either to the back of the poster which is then placed on the panel using a brush either on the panel

  itself before applying the poster on it.

  This known display technique lends itself to the installation of posters of any dimension on supports of any dimension taking into account the possibility of juxtaposing several elements constituting the poster and ensures between the poster and the panel a sufficiently fastening

  intimate so that the latter can communicate his own characteristics to the poster

  ticks of rigidity and mechanical resistance, that is to say an outfit that the poster does not have in itself, but it causes nuisances inherent in the in situ use of liquid glue, which is difficult to '' avoid splashes and spills on the ground, the need to use scraping to remove a poster before putting another, and the production of waste paper resulting from such scraping; in addition, this technique has the disadvantage of prolonged exposure of operators to bad weather and to the dangers of automobile traffic, and that of prolonged occupation of the public highway by operators and their

parked vehicle.

  These drawbacks are at least partially avoided by implementing another display technique, which has appeared more recently, consisting in placing a paper poster inside a box, the front of which can be opened for this purpose, is glazed to protect the poster; the latter is retained in the box by weakly mechanical means such as a localized pinch or an adhesive also localized; this localized retention, by weak mechanical means, locally weakens the poster and allows it to crease under the effect of humidity variations, insofar as no panel contributes to the resistance and rigidity of the poster as is the case when implementing the previously commented technique; these drawbacks limit the format of the posters that can thus be put up; weight requirements of the glass facade also limit this format, it being understood that the absence of any panel ensuring cohesion to the poster generally made of paper does not allow the latter to be exposed directly to the weather and therefore imposes the use of such a glass facade, even if it is also true that the glass facade has the disadvantage of detracting from the visual rendering of the poster due to the risk of parasitic reflections and the presence of raindrops on the front of this glass facade, that is to say

condensation on the back of it.

  In addition, to a lesser degree than the display technique described above, this technique requires a prolonged presence of operators, thus exposed for a prolonged period to bad weather and traffic and occupying prolonged time on public roads, particularly in

  of their parked vehicle.

  The aim of the present invention is to propose a new

  display technique overcomes these disadvantages.

  To this end, the present invention provides a display panel, of substantially rigid type, having a front intended to receive a poster by gluing by means of a reversible glue and to authorize the take-off of the poster by means of a solvent for said adhesive, characterized in that it is permeable to said adhesive and to said solvent, between its front and its back, in a manner distributed substantially over all of the respective areas of the latter; according to a preferred embodiment, the panel has for this purpose a multitude of holes passing through it from front to back, said holes being distributed substantially over all of the respective areas of said front and said back, and may have at least at the level of said front a cumulative area of the order of 40% to 50% of the area of said front, approximately, these figures being

  indicated by way of nonlimiting example.

  It is easy to see that such a panel, by its substantial rigidity and by the possibility of sticking a poster in a distributed manner on its front, gives the poster, even if the latter is made of paper, sufficient hold so that it is possible to expose it directly to the weather, without the protection of a glazed facade, which eliminates the drawbacks inherent in the presence of such a facade; in particular, the direct vision of the poster preserves the visual rendering of the latter and the dimensions of the panel, that is to say of the poster likely to be there

  affixed, are not limited by weight requirements.

  In addition, the permeability of the panel to the adhesive makes it easier to anchor the latter, that is to say also to anchor the poster to the panel, and the permeability of the latter to a solvent. glue allows much easier and faster takeoffs by

  intervention with solvent from the back of the panel.

  To this end, the present invention also provides a method of placing and removing a poster pasted by means of a reversible adhesive on the front of a panel according to the invention, characterized by the succession of steps consisting in: a ) coat the front of the panel with said glue, making the latter penetrate between the front and back of the panel, b) apply the poster against the front of the panel, c) allow the said glue to dry, and, when the poster must be peeled off, d) apply a solvent for the said glue to the back of the panel, making it penetrate to the front of the latter, to dissolve the said glue to the front of the panel,

e) remove the poster thus released.

  Naturally, the solvent thus applied can consist simply of water possibly added with a detergent, if the adhesive

  used is soluble in water after drying.

  It is easy to see that the possibility of taking off in this way by applying a solvent to the back of the panel, the solvent of which easily gains on the front, makes it possible to considerably facilitate takeoff since the glue is simultaneously reached over the entire surface. mutual contact between the poster and the front of the panel; takeoff is considerably accelerated and it can be dispensed with a scraping generating abundant waste insofar as it becomes possible to "peel" the poster in its entirety, or even to hunt it in its entirety by applying the solvent under pressure on the back

of the panel.

  These possibilities limit the presence time of operators and their vehicle if they take place in situ; moreover, insofar as the display panel is necessarily made lighter by the presence of the holes in comparison with a traditional display panel, and can therefore be handled and transported easily, it becomes possible to envisage a bonding and take-off of the posters in the workshop, in optimal conditions of comfort and security, by limiting the times of presence of the operators and their vehicle to the time necessary to assemble or dismantle the panels in relation to a support, meanwhile placed permanently in situ, on support means specifically provided for this purpose and for example formed by an assembly of uprights anchored in the ground and crossbeams connecting them mutually, or on pre-existing support means and for example constituted by a wall . When the exhibition site lends itself to it and when the display panel according to the invention has two rectilinear edges, mutually parallel, of determined length, intended to be oriented substantially horizontally, the support may comprise at least a set of two substantially horizontal slideways, mutually integral, having substantially horizontally a dimension substantially equal to said determined length and defining towards each other a respective substantially horizontal channel, having a U-section in any vertical plane to receive substantially horizontal sliding l 'one, respectively, of said edges; such an embodiment, directly inspired by supports used for the reception of traditional type display panels having small dimensions, however, leads to a certain difficulty in handling the panel in particular when it is engaged in the slides, in particular when this panel has large dimensions and even if, with equal dimensions, the realization of the panel in accordance with the present invention makes it possible to lighten it

  considerably and, therefore, to make it more manageable.

  To remedy this drawback, that is to say to facilitate the positioning of the panels according to the invention on their support or their disassembly relative to this support, the present invention provides a simple and economical support for at least one display panel according to the invention which has two rectilinear edges, mutually parallel, of determined length, intended to be oriented substantially vertically; this support is characterized in that it comprises on the one hand at least a set of two substantially vertical slides, mutually integral, having substantially vertically a dimension substantially equal to said determined length and defining towards each other a respective channel substantially vertical, having a U-shaped section in any horizontal plane and open downwards at the respective lower ends of said slides to receive the substantially vertical sliding of one, respectively, of said edges, and on the other hand means d obturation of said lower end of at least one of said slides, said closure means being mounted movable relative to said slides between a closure position of said lower end and a release position thereof and may be temporarily immobilized with respect to said slides at least in said position for closing the said lower end; said shutter means may advantageously include a flat frame articulated around a substantially horizontal axis at the ends

  respective upper of said slides, between a sensitive orientation-

  vertical ment in which it frames said slides and has opposite the lower ends thereof, under said lower ends, a substantially horizontal flange closing the latter down, and an oblique orientation relative to the vertical and in which said flange releases said lower ends downwards, said frame being able to be immobilized temporarily with respect to said slides at least in said substantially vertical orientation, so

  aesthetic, efficient and simple to carry out.

  Such a support can be mounted movable relative to the ground on said specifically provided or pre-existing support means, to facilitate the introduction of a panel between the slides or the extraction of this panel out of the slides, but, so particularly simple, it is preferably intended to be placed in a fixed position above a floor, in which case said specifically provided or preexisting support means provide rigid support for said slides relative to said floor and preserve between said respective lower ends slides and the ground a distance which, measured substantially vertically, is at least

  equal to said determined length.

  The same support can receive a single panel according to the invention, or receive several; for example, according to a preferred embodiment, it comprises two copies of said set of two slides and respective mutually independent closure means, each slide of one of the games being juxtaposed with a respective slide of the other of said games, to support two display panels facing back against back, each of the two display panels protecting the

  back of the other view and weather panel.

  However, especially when nothing protects from the weather.

  ries the back of a panel according to the invention, it is preferable to implement the method according to the invention by causing, during step a) or b), the passage of an excess of glue on the back of the panel, through it, to better anchor the glue and, with it, the poster on the panel, this excess glue is then preferably smoothed between steps b) and c) to offer less grip to inclement weather when the adhesive used is soluble in water after drying; a particularly effective mutual anchoring of the poster and of the panel is thus obtained, without taking off the poster presenting great difficulties even in the case of a water-soluble adhesive since it is possible to project this water and any pressurized additives on the back of the panel to dissolve the glue when desired, even if it has been dosed so as to withstand bad weather which only involves low water spray pressures; in addition, when it is planned to practice bonding or take-off in the workshop, take-off can be practiced by dipping in a solvent bath. Naturally, numerous embodiments of a display panel according to the invention can be envisaged; in particular, the rigidity of this panel may be inherent, in which case the panel may be formed of a homogeneous plate, inherently substantially rigid, provided with a multitude of perforations, each of which constitutes one of said holes; the panel can also be produced from a component that does not have its own rigidity and from a component that stiffens the first-mentioned component; thus, the panel can be formed from a homogeneous, flexible, isotropic, substantially inextensible sheet, provided with a multitude of perforations each of which constitutes one of said holes, and with a rigid frame which borders said sheet on all sides and of which said sheet is made integral, in a substantially continuous manner, in the stretched state, or else of a flexible, isotropic, substantially inextensible assembly, of flexible, substantially inextensible, streaked threads defining between them a multitude of meshes each of which constitutes the 'one of said holes, and a rigid frame which borders said assembly on all sides and of which said assembly is made integral, substantially continuously, in the stretched state; said yarns can be metallic, or of textile type, chosen from natural yarns and synthetic yarns, preferably monofilaments; in particular, good results have been obtained in tests by producing the panel from a taffeta of monofilament polyester yarns with a diameter of between 90 and 100 micrometers, at a rate of approximately 34 threads per linear centimeter, glued using '' a single or two-component polyurethane adhesive on a frame constructed of welded aluminum tubes, and using for the postering of the poster on the panel an aqueous solution, between 5 and 15% of dry extract, alcohol partially hydraulic polyvinilic additionally including a nonionic antifoam, a preservative and a slip agent, the resistance of the assembly to water being able to be adjusted to the desired level by incorporating monoaldehyde or dialdehyde, or alternatively amnoplast and take-off of the poster being carried out by immersion in a non-ionic, non-foaming detergent bath and rinsing with a pressurized water jet; naturally, these indications are given by way of nonlimiting example.

  Other characteristics and advantages of the invention emerge-

  from the description below, relating to some examples not

  limiting of implementation, as well as the attached drawings which form part

integral to this description.

  Figure 1 shows a perspective view of a first

  exemplary embodiment of a display panel according to the invention.

  Figure 2 shows a perspective view of a second embodiment of a display panel according to the invention, two variants of which are illustrated respectively in the upper half

  left and in the lower right half of this figure 2.

  Figures 3, 4, 5 show, in vertical section views, greatly enlarged, of the alternative embodiment illustrated in the lower right half of Figure 2, respectively the gluing of the panel, the

  putting a poster on it and taking off this poster.

  FIG. 6 shows, in a perspective view with partial cutaway, a support designed to receive two display panels according to the invention oriented back against back, the respective corresponding frames occupying a release orientation of the

  lower ends of slides.

  Figure 7 shows a support view in section through a substantially vertical plane, one of the frames being illustrated mainly in the same orientation as in Figure 6 while the other frame is illustrated in its orientation corresponding to the shutter of the lower ends of the corresponding slides. Reference will firstly be made to FIGS. 1 and 2, where a panel according to the invention I has been illustrated having a generally rectangular shape, between two rectilinear edges 2 and 3 mutually parallel, generally intended to be oriented substantially vertically, and two rectilinear edges 4 and 5 also mutually parallel but perpendicular to the two previously mentioned edges 2 and 3, which edges

  4 and 5 are generally intended to be oriented substantially horizontal-

  mentally, and to be turned downward and upward respectively; between these edges 2, 3, 4, 5, the panel 1 has two main flat, rectangular faces, mutually parallel and turned opposite to each other, on the basis of a face 6 constituting its front, intended to receive

  a poster by collage, and a side 7 constituting its back.

  According to the present invention, the panel 1 is permeable, between its front 6 and its back 7, to at least one glue capable of being used to stick a poster on its front 6, namely generally an adhesive constituted by a macromolecule giving in a solvent medium (in particular but not exclusively an aqueous medium) colloidal solutions, or dispersions, or adhesive emulsions whose dry film is reversible by impregnation of a solvent (including water); the panel according to the invention is also permeable to this solvent between its front and back, its permeability to the adhesive as to the solvent being distributed substantially over all of the respective areas of its front

6 and its back 7.

  To this end, the panel 1 could be porous but, both for reasons of simplicity and economy of manufacture of the panel, for reasons of mechanical strength thereof, for reasons of effectiveness of bonding and for for reasons of ease and speed of take-off, it is preferred that the panel 1 has a multitude of holes passing through it from front 6 to back 7, said holes being distributed substantially over all of the respective areas of said front 6 and said back 7 and having a cumulative area such that, at the same time, they offer maximum permeability to the glue and to the solvent and leave between them a sufficient area of the front 6 for the latter to display, taking into account the presence of a intermediate adhesive film, a support comparable to a continuous support, that is to say capable of effectively joining each point of the poster to the front 6 of the panel, by means of the p glue ellicle, to communicate on the poster, without discontinuity, the mechanical qualities in particular of rigidity of the panel 1; it has been determined that holes having at least at the level of front 6 a cumulative area of the order of 40% to 50% of the area of said front 6, approximately, make it possible to reconcile these two imperatives in the case of use , as an adhesive, of an aqueous colloidal solution of starch or cellulose derivatives, but these figures are given only for

non-limiting example.

  Naturally, several embodiments of such a panel 1 having distributed holes can be provided, and there is illustrated in FIG. 1 a first embodiment according to which the panel 1 as just described is formed of a homogeneous plate 8, inherently substantially rigid and for example formed of a metal sheet, such as a steel or aluminum sheet, or a plate of a synthetic material such as polyester possibly reinforced with glass fibers, these examples being in no way limiting; the edges 2, 3, 4, 5 of the panel 1 are in this case constituted by a peripheral edge 9 of the plate 8, which constitutes the front 6 and the back 7 of the panel 1 by two rectangular, plane, mutually parallel faces bordered by this

peripheral edge 9.

  In the case of such an embodiment of a panel according to the invention 1, the permeability of the adhesive and of the solvent between the front 6 and the back 7 of the panel 1 is ensured by a multitude of perforations 10, for example cylindrical of revolution around respective axes (not referenced) perpendicular to the faces of the plate 8 constituting respectively the front 6 and the back 7 of the panel 1, which perforations 10 are distributed uniformly over all of the respective expanses of these faces and

  lead into both of them.

  According to another embodiment of a panel 1 according to the invention, two variants of which are illustrated in FIG. 2 to which reference will now be made, the panel 1 derives its rigidity from a rigid frame 11, whose general shape is rectangular and which in particular constitutes the straight edges 2, 3, 4, 5 of the panel; in the example illustrated, this frame 11 is formed by a welded assembly of four rectilinear tubes 12, 13, 14, 15 of square and rectangular section, for example of aluminum, which are distributed in two mutually perpendicular sets of two parallel tubes two by two, each of these tubes 12, 13, 14, 15 constituting by a rectangular face, planes a respective edge 2, 3, 4, 5 of the panel 1; optionally, as shown in dashed lines in FIG. 2, the frame It can be internally stiffened by spacers which, by way of nonlimiting example, can be made of straight metal tubes, of the same kind and of the same type. section that the tubes 12, 13, 14, 15 on which these spacers are then welded; in the example illustrated, four spacers 16, 17, 18, 19 are shown, each of which rigidly connects two adjacent tubes among the tubes 12, 13, 14, 15, it being understood that other arrangements could be adopted without the we

  is therefore outside the scope of the present invention.

  In the case of this embodiment, the front 6 and the back 7 of the panel 1 are constituted by means which are in themselves flexible, but

  however isotropic and substantially inextensible, rigidified by solidarity

  substantially continuous, in the stretched state, with the frame 11.

  According to a first variant illustrated in the upper left half of FIG. 2, these means consist of a homogeneous sheet 20, for example constituted by a thin metal sheet or, preferably, by a sheet of a synthetic material such as a polyester or a material of the type sold under the brand "MYLAR", two sides of which respectively define the front 6 and back 7 of the panel 1 and which is made permeable to glue and to the solvent, between the two aforementioned faces, by a multitude perforations 21 distributed uniformly over the entire extent of said faces of the sheet 20; naturally, it would not be departing from the scope of the present invention to choose materials different from the materials indicated above for producing the sheet 20, the perforations 21 being in each case adapted, in their shape and size, to the material constituting the sheet 20 and which may consist, for example, of micro-perforations in the case of a sheet of "MYLAR" when it may be perforations of larger section, for example of the order of several square millimeters, in the case of a sheet 20 consisting of a thin polyester plate, these figures

  being indicated by way of nonlimiting example.

  According to another variant, illustrated in the lower right half of FIG. 2, the flexible, isotropic, substantially inextensible means defining the front 6 and the back 7 of the panel are formed by an assembly 22 of flexible, substantially inextensible, streaked strands defining between them a multitude of meshes 25 establishing the desired permeability to the adhesive and to the solvent between two faces of the assembly 22 constituting respectively the front 6 and the back 7 of the panel 1; the wires can be metallic, in which case the assembly 22 is a mesh or a trellis; they can also be of textile type, chosen from natural threads and synthetic threads, preferably monofilaments, in which case the assembly 22 is preferably a fabric of taffeta type, in which warp threads 23 and threads intersect of

  frame 24 (Figures 3 to 5, relating to this alternative embodiment).

  By way of nonlimiting example, good test results have been obtained by using as assembly 22 a taffeta of monofilament polyester yarns with a diameter between 90 and 100 μm, at a rate of approximately 34 threads per centimeter linear, corresponding to an open area, that is to say to a cumulative area of the meshes, reduced to the area of the front 6, of the order of 42%; Naturally, it would not go beyond the ambit of the present invention to use wires of another nature and / or of another diameter and / or a different number of wires per linear centimeter and / or offering a different open surface.

  To communicate a flatness in particular on the front 6 of the sheet 20 or of the assembly 22 by mutual securing, the components of this frame 11, namely the tubes 12 to 15 and, possibly 16 to 19 in the example illustrated, present at less than one side of the frame 11 oriented like the front 6 of the panel of the respective flat faces, mutually coplanar, complementing each other without discontinuity at least as regards the components of the frame It constituting the edges 2, 3, 4, 5 of the panel 1, namely the tubes 12, 13, 14, 15 in the example illustrated; specifically, in this example, these tubes 12 to 15 have respective faces not referenced plane, mutually coplanar, oriented like the front 6 of the panel 1 and together constituting a planar annular face 26 continues, directly adjacent to the edges 2, 3, 4, 5 of panel 1 as shown in Figure 7 which illustrates a panel according to the embodiment of Figure 2, in its variant illustrated in the lower right half thereof; the other possible components of the frame 11, namely in the illustrated example the possible spacers 16 to 19, are completely set back with respect to this face 26, coplanar to which they however preferably have respective faces, in a manner not illustrated. but easily conceivable by a skilled person. Incidentally, we note that in order to facilitate the mounting of the panel 1 in a support of a type which will be described later with reference to Figures 6 and 7, the frame It has opposite the annular face 26, it that is to say in an orientation similar to that of the back 7 of the panel 1, another annular face 27 also planar, parallel to the annular face 26 and defined as the latter by respective faces of these components constituting the edges 2 to 5 of the panel, that is to say of the tubes 12 to 15 in the example illustrated, the other possible components of the frame 11 such as the spacers 16 to 19 being preferably set back with respect to this face 27, coplanar with which they can however have respective faces, in a manner not illustrated but

  easily conceivable by a skilled person.

  As shown in FIG. 7, the assembly 22 or, not illustrated, the sheet 20 is applied flat by its face constituting the back 7 of the panel 1 against the face 26 of the frame II which, thus, borders this face of the assembly 22 or the sheet 20 over its entire periphery and, preferably, the assembly 22 or the sheet 20 is further folded over the edges 2, 3, 4, 5 of the panel 1, until the face 27 thereof which however remains clear, as shown in Figure 7 in connection with the assembly 22; mutual securing of the assembly 22 or of the sheet 20 and of the frame It is provided as continuously as possible for example by bonding to the entire annular face 26 of the frame 11 and, depending on the mode of implementation preferred illustrated in Figure 7, at the edges 2, 3, 4, 5 of the panel 1 which are thus formed not directly by the tubes 12, 13, 14, 15 but indirectly by the latter, through the 'assembly 22 or sheet 20; by way of nonlimiting example, in the case of an assembly 22 produced in the form of a taffeta of monofilament polyester yarns of the type indicated above, good results have been obtained by ensuring bonding to the frame 11, then produced by welded assembly of aluminum tubes, using a polyurethane adhesive one or two component, other bonding materials that can be used without departing from the scope of the present invention and the bonding can be replaced by other joining methods and in particular by welding when the materials

  respective assembly 22 or sheet 20 and the frame It is suitable.

  It will be noted that when adopting the embodiment of a panel 1 according to the invention which is illustrated in FIG. 2, on the one hand the back 7 of the panel is set back towards the front 6 of it by relative to the face 27 of the frame II and on the other hand the perforations 21 or the meshes 25 are closed in all areas of contact with the frame II; the value of this shrinkage and the proportion of perforations 21 or meshes 25 thus closed remain low enough, however, not to adversely affect the possibilities offered by a panel according to

  the invention, listed in the preamble.

  These possibilities are expressed in particular in terms of new possibilities for placing and removing a poster affixed to the panel 1, which will now be described in more detail in relation to FIGS. 3 to 5 which illustrate a panel according to the invention produced in accordance with FIG. 2, and more precisely in accordance with the variant illustrated in the lower right half thereof, it being understood that the variant illustrated in the upper left half of this figure 2

  and the embodiment of Figure I offer similar possibilities.

  Reference will first be made to FIG. 3, which illustrates the gluing of a panel 1 according to the invention, of which only part of the assembly 22 of warp threads 23 and of threads has been illustrated. frame 24 defining between them meshes 25, which assembly constitutes the front 6 and the back 7 of the panel 1 During this gluing, the front 6 of the panel 1 is coated with an appropriately chosen glue, reversible by impregnation by means of '' a solvent, by making this glue 28 penetrate between the front 6 and the back 7 of the panel 1 by the meshes 25 of the assembly 22 (or by the perforations 21 of the sheet 20, or also by the perforations 10 of the plate 8 respectively, not illustrated but easily understood by a person skilled in the art), preferably until the appearance of an excess of glue on the back 7 of the panel 1, generally in the form of studs 29 located in line with the meshes 25 (or perforations 21, or perforations 10 respectively nt), so that the glue 28 does not only have the shape of a thin film 30 covering the front 6 of the panel 1, but the shape of an interpenetrated mass

continuously with the latter.

  This gluing operation can be carried out by any means known to a person skilled in the art, and in particular by means of a brush or a roller applied against the front 6 of the panel 1; however, preferably, it is performed by means of a nozzle 31 projecting the glue 28,

  preferably added with a foaming agent, on the front 6 of panel 1.

  Then, as shown in FIG. 4, the poster 32 is applied to the film 30 of glue 28 previously formed, which is smoothed by any suitable means such as a brush 33 by applying a push towards the front 6 of the panel. 1, which accentuates the abovementioned penetration of the glue into the meshes 25 (or the perforations 21, or the perforations 10) thereof and, possibly, causes this penetration in particular until the appearance of an excess of glue on reverse 7 of panel 1 in case it did not take place during the gluing operation

  proper Simultaneously with the smoothing of the poster 32 or later

  this smoothing, but while the glue is not yet dry and in the event that we caused the appearance of an excess of glue on the back 7 of the panel 1, we also smooth this excess for example by means of a squeegee 34 applied to the back 7 of the panel, so that the localized studs 29 of glue are thereby flattened on the back 7 of the panel 1, joining together so that the warp threads 23 and weft 24 (or the material of the sheet 20 between the perforations 21, or that of the plate 8 between the perforations 10) are at least partially or, preferably, completely enveloped by the adhesive 28 which, after drying, thus ensures an anchoring effective of poster 32 on panel 1 and thus best communicates to poster 32 the mechanical characteristics

of this panel 1.

  FIG. 5 illustrates the assembly formed by the panel 1, the poster 32 and the adhesive 28 after drying of the latter and further illustrates a particularly advantageous mode of take-off, accessible

  when using a display panel according to the present invention.

  Due to the permeability of the latter between its front and back, it is possible to take off by applying a solvent 35 of glue 28 on the back 7 of the panel 1 and by making this solvent 35 penetrate to the front 6 of that -this, to dissolve all of the glue 28 including at

  level of this recto 6 of the panel 1 and thus release then removed the poster 32.

  The application of the solvent 35 by the front 7 of the panel 1 can be carried out by various means, and in particular by coating in a manner not illustrated but easily conceivable by a person skilled in the art, or by spraying by means of an appropriate nozzle 36; it can also be carried out by soaking the assembly formed by the panel 1 and by the poster 32 if this panel 1 is removably supported on the exhibition site and can therefore be transported to the workshop; in such a case, it is advantageously possible to combine soaking in the solvent, as a first operation capable of causing an impregnation of the adhesive in solvent, at its core, and a spraying of solvent under pressure by the back 7 of the panel 1, causing the expulsion of the glue in a direction from the back 7 towards the front 6 of the panel 1, as well as the expulsion of the poster 32, without it being necessary to scrape and tear the latter; naturally, the use of a water-soluble adhesive considerably facilitates these

  takeoff operations due to the possibility of using water,

  addition of detergent, as solvent.

  Reference will now be made to FIGS. 6 and 7 where an exemplary embodiment of a support suitable for easy installation and dismantling of a panel according to the invention has been illustrated, in order to allow

  thus practice bonding as take-off in the workshop.

  This support 37 is intended to be permanently fixed to the ground 38 on the exhibition site and, for this purpose, has for example two rigid uprights 39, 40 rectilinear, substantially vertical, embedded in the ground 38 at their lower end and connected mutually rigidly at their upper end, by a rigid cross-member 41 rectilinear, substantially horizontal; in an intermediate zone between their upper ends and their lower ends, in practice at a distance from the cross member 41 close to the length 1 of the edges 2 and 3 of a panel 1 intended to be oriented substantially vertically, the two uprights 39 and 40 are also mutually rigidly connected by a rigid cross-member 4 2 rectilinear, substantially horizontal and parallel to the cross-member 41; the cross member 42 is itself distant from the ground 38, in a substantially vertical direction, by a distance close to 1 or greater than

  1, for reasons which will emerge from the following description.

  The rigid assembly formed by the two uprights 39 and 40 and by the crosspieces 41 and 42 has a common mean plane 43, substantially vertical, which constitutes a general plane of symmetry for the assembly of the support 37, which also has another plane, substantially vertical,

  of symmetry, which is not referenced but is oriented perpendicular-

  lie at crosspieces 41 and 42, midway between the two uprights 39 and 40.

  In a substantially horizontal direction, parallel to the crosspieces 41 and 42, the latter are mutually spaced by a distance close to the length L of the edges 4 and 5 of the panel 1, intended to be

  oriented substantially horizontally.

  In mutually symmetrical positions relative to the plane 43, respectively on either side thereof, each upright 39, bears integrally, between the crosspieces 41 and 42, two respective substantially vertical slides 44, 45 (upright 39, respectively on either side of the plane 43), 46, 47 (upright 40, respectively on the same side thereof as the slide 44 and on the same side thereof as the slide 45), each of these slides having when '' it is seen in section by any substantially horizontal plane a U-section determined by a substantially vertical flat core such as 48, perpendicular to the plane 43, and by two substantially vertical flat wings such as 49, 50, mutually parallel and parallel to the plan 43; the references 48, 49, 50 apply to the slide 44 but the slides 45, 46, 47 are strictly identical to it; by one of its wings, such as 49, each of the slides 44, 45, 46, 47 is applied in solidarity against the corresponding amount respectively 39 (slides 44 and 45) or 40 (slides 46 and 47) while its other wing such as 50 is further away

  from the plane 43 that the aforementioned wing such as 49, the distance separating mutual-

  Lement these wings 49 and 50 perpendicular to the plane 43 being substantially equal to the thickness e of a panel 1, defined as the distance mutually separating the faces of the plate 8 defining respectively the front 6 and back 7 of the panel 1 if l '' we refer to the embodiment illustrated in Figure 1 or as the distance mutually separating the face 27 of the frame 11 and the face of the sheet 20 or the assembly 22 constituting the front 6 of the panel 1 if one is refers to the embodiment of Figure 2; moreover, if one refers to two slides located on the same side of the plane 43 (slides 44 and 46, on the one hand, and slides 45 and 47, on the other hand), the respective wings such as 49 and 50

  of these slides face each other and their souls such as 48 are respective-

  ment more distant from each other, the distance separating these cores 48 substantially horizontally being substantially equal to the length L of the edges 4 and 5 of a panel so that two slides thus located on the same side of the plane 43 define one towards l 'another a respective channel 51, substantially vertical, adapted to receive the substantially vertical sliding one, respective, of the edges 2 and 3 of a panel 1 whose cores such as 48 of the slides marry these edges 2 and 3, whose wings such as 50 of these slides follow zones of front 6 closely located in the immediate vicinity of these edges 2 and 3, and whose wings such as 49 of slides follow similar zones of front 6, if one refers to the mode of embodiment illustrated in FIG. 1, or of the face 27 if one refers

  in the embodiment of FIG. 2.

  In a substantially vertical direction, each of the slides 44, 45, 46, 47 has a dimension substantially equal to the length 1 of one of the edges 2 and 3 of a panel 1, so that the latter can thus be integrally engaged and retained in two slides located on the same side of the plane 43, in practice so that the edges 5 and 6 of the panel 1 are located respectively at the level of the

  cross member 41 and at cross member 42.

  It is easily understood that, due to the arrangements which have just been described, the support 37 illustrated in FIGS. 6 and 7 is capable of simultaneously receiving two panels 1, arranged respectively on either side of the plane 43, parallel to the latter. , so that the back of one is placed opposite the back of the other, but it is understood that it would not go beyond the scope of the present invention by transposing the arrangements illustrated in Figures 6 and 7 with a view to producing a support capable of receiving a single panel, in particular against a wall replacing the assembly formed by the uprights 39, 40 and by the crosspieces 41 and 42 or integrally carrying such an assembly whose uprights 39, 40 would be shortened to a dimension just sufficient to mutually connect the crosspieces 41 and 42, or on the contrary a support capable of receiving more than two panels, and / or several panels mutually juxtaposed to produce a display of th dimension

particularly important.

  Naturally, it could be conceived that the respective channels such as 51 of the different slides 44, 45, 46, 47 are permanently closed at the lower ends such as 53 of the latter but open permanently, or with the possibility of temporary closure, at the level of their upper ends such as 52 in order to allow a panel 1 to be introduced into two slides placed on the same side of the plane 43 or to extract such a panel from these slides by the ends

  respective superiors such as 52 of these.

  However, such a choice would frequently drive operations

  teurs to work at great heights, particularly inconvenient, even dangerous, and it is preferred in accordance with the present invention that the channels such as 51 of the different slides 44, 45, 46, 47 are open at the lower ends such that 53 of the latter, whose upper ends such as 52 may remain open or be closed, by placing these lower ends such as 53 at a distance from the ground 38, measured substantially vertically, at least equal to the length 1 of one of the edges 2 and 3 of the panel 1, so that the introduction of such a panel into two slides located on the same side of the plane 43, or the extraction of such a panel out of these slides, can

be done from the bottom.

  Provisional sealing means of the respective lower ends such as 53 of the slides 44, 45, 46, 47 are nevertheless provided.

  to retain a panel in the respective corresponding slides.

  Different embodiments of such closure means could be envisaged, but FIGS. 6 and 7 illustrate a particularly simple embodiment, further contributing to the aesthetics of the

support 37.

  In the case of this embodiment are provided, respect-

  on both sides of plan 43, to close at will respectively

  the respective lower ends of the runners 44 and 46 and the

  respective lower ends of slides 45 and 47, two frames

  identical flat elements 54, 55 situated respectively on either side of the plane 43, with respect to which they can occupy several orientations by articulation around respective substantially horizontal axes 56, 57, mutually parallel and symmetrical one of the other with respect to the plane 43, on the crosspiece 41 and more precisely in an upper zone thereof, at the level of the upper ends such as 52 of the slides

44, 45, 46, 47.

  More specifically, each frame 54, 55 comprises a flat annular strip 58, 59 which, in one of the orientations thus accessible by rotation about the respective axis 56, 57 relative to the cross member 41, is oriented substantially vertically as is illustrated respectively in phantom and in solid line in Figure 7, to be placed opposite a continuous peripheral area of the front 6 of the panel 1 and frame the assembly formed by such a panel 1 and by the slides 44 , 46 or 45, 47 receiving it; the dimensioning of the frames 58 and 59 for this purpose is apparent from the normal aptitudes of a person skilled in the art; each strip 58, 59 thus delimits a window 60, 61 authorizing a direct view of the essentials of the front 6 of the panel 1 and of the poster 32 pasted thereon, the effective holding of the poster by the panel making it possible to dispense with glazing of window 60, 61 and eliminating the drawbacks

  inherent in the presence of such glazing.

  Furthermore, each frame 54, 55 has, integral with the respective strip 58, 59 and opposite the respective window, 61 relative to the latter, a respective continuous peripheral flange 62, 63 oriented at right angles. relative to the respective strip 58, 59 and having in particular a respective upper zone 64, 65 oriented substantially horizontally in the aforementioned orientation of the frames 58, 59 to cover the upper ends such as 52 of the slides 44, 45, 46, 47 as well as the upper edge 5 of the panel 1 ensuring the connection between the strip 58, 59 and the respective axis 56, 57 of articulation on the cross member 41, and a respective lower zone 66, 67 also oriented horizontally in said orientation of the frames 58 , 59, in which this zone is placed immediately under the lower ends such as 53 of the slides 44, 45, 46, 47 and of the edge 4 of a panel 1 engaged in these, for emp prevent the latter from emerging from below; in the aforementioned orientation, the frames 58, 59 are retained by respective latches such as 68, 69, carried by the respective lower zones 66, 67 of the respective flanges 62, 63 and cooperating, for example by means of respective hooks 70, 71, with counterparts arranged on the crosspiece 42, for example in the form of lights 72, 73 thereof, respectively; each edge 62, 63 moreover has two lateral zones which are not referenced which, in the above-mentioned orientation, run along the two slides situated respectively on the same side of the plane 43

  that framing considered, by souls such as 48 of these slides.

  When you want to remove a panel 1 from the respective slides-

  corresponding, simply unlock the respective framing-

  corresponding 58, 59, to make it leave the above-mentioned orientation for an oblique orientation with respect to the plane 43, as illustrated with reference to the two frames in FIG. 6 and with regard to the frame 54 in FIG. 7, which releases the lower ends such as 53 of the corresponding slides downwards as well as the corresponding panel 1 and makes it possible to let the latter descend by gravity, to then replace it with another panel preferably provided beforehand with a poster before to bring the frame 54, 55 in an orientation such that it again closes the lower ends such as 53 of the slides downwards and retains the substitution panel against any fall. Not illustrated but easily conceivable by a person skilled in the art, the support 137 which has just been described could be replaced by a support which, instead of having at least one pair of substantially vertical slides for receiving a panel according to the invention by its edges 2 and 3, would have at least a pair of substantially horizontal slides for receiving a panel according to the invention by its edges 4 and 5, then received at substantially horizontal sliding in said slides; for this purpose, the latter would have substantially horizontally a dimension substantially equal to L and would define towards each other a respective substantially horizontal channel, having in any vertical plane a U-shaped section open at least at one of the ends of this channel, the extreme openings of the channels of the two slides being identically oriented to allow the introduction or removal of a panel by relatively horizontal relative sliding; this section could advantageously be defined by respective flat, substantially horizontal cores,

  mutually parallel, mutually spaced substantially vertical-

  ment by a distance substantially corresponding to 1, and by a respective pair of substantially vertical flat wings, mutually parallel, mutually spaced substantially horizontally by a distance corresponding substantially to e, the two wings of each slide being projecting towards the 'other slide relative to the corresponding core respectively. It will be noted that due to the reduced weight of a panel according to the invention, in comparison with a traditional rigid display panel, of equivalent size, it is thus possible to dismantle one panel and replace another without having to resort to this effect to mechanical lifting means, and this in a wide range of panel dimensions

display.

  Naturally, a person skilled in the art will readily understand that the modes of implementation which have just been described constitute only non-limiting examples, with respect to which many variants can be provided without departing from the scope of the present invention.

Claims (12)

  1 display panel, of substantially rigid type, having a front intended to receive a poster (32) by gluing by means of a reversible glue (28) and to authorize the take-off of the poster (32) by means of a solvent (35) for said glue (28), characterized in that it is permeable to said glue (28) and to said solvent (35), between its front (6) and its back (7), in a distributed manner   substantially over all of their respective areas.   2 panel according to claim 1, characterized in that it has a multitude of holes (10, 21, 25) passing through the front (6) to the back (7), said holes (10, 21, 25) being distributed substantially on the   all of the respective areas of said front (6) and said back (7).   3 panel according to claim 2, characterized in that said holes (10, 21, 25) have at least at said recto (6) a cumulative area of the order of 40% to 50% of the area of said recto (6 ), about.   4 panel according to any one of claims 1 to 3,   characterized in that it is formed of a homogeneous plate (8), inherently substantially rigid, provided with a multitude of perforations (10) including   each constitutes one of said holes.   Panel according to any one of claims I to 3,   characterized in that it is formed from a homogeneous sheet (20), flexible, isotropic, substantially inextensible, provided with a multitude of perforations (21) each of which constitutes one of said holes, and a rigid frame ( I 1) which borders said sheet (20) on all sides and of which said sheet (20) is   made integral, substantially continuously, in the stretched state.   6 panel according to any one of claims 1 to 3,   characterized in that it is formed of an assembly (22) flexible, isotropic, substantially inextensible, of son (23, 24) flexible, substantially inextensible, interspersed defining between them a multitude of meshes (25) each of which constitutes one of said holes, and a rigid frame (11) which borders said assembly (22) on all sides and of which said assembly (22)   is made integral, substantially continuously, in the stretched state.   7 panel according to claim 6, characterized in that   said wires (23, 24) are metallic.   8 panel according to claim 6, characterized in that said son (23, 24) are of textile type, chosen from natural son and   synthetic yarns, preferably monofilaments.   9 panel according to claim 8, characterized in that   said assembly (22) is a taffeta of monofilament polyester yarn (23, 24)   ment with a diameter between 90 and 100 micrometers, at a rate of 34   threads approximately per linear centimeter.   Method of installing and removing a poster glued with reversible adhesive (28) on the front (6) of a panel (1) according to   any one of claims 1 to 9,   characterized by the succession of steps consisting in a) coating the front (6) of the panel (1) by means of said glue (28) by making it penetrate between the front (6) and the back (7) of the panel (1 ), b) apply the poster (32) against the front (6) of the panel (1), c) allow the adhesive to dry (28), and, when the poster (32) must be peeled off, d) apply a solvent (35) of said glue (28) on the back (7) of the panel (1) by making it penetrate to the front (6) of the latter, to dissolve said glue (28) to the front of the panel ( 1),   e) remove the poster (32) thus released.   Il Method according to claim 10, characterized in that, during step a) or b), causing the passage of an excess (29) of glue   (28) on the back (7) of the panel (1), through the latter.   12 panel according to claim 11, characterized in that   smoothes said excess (29) of glue (28) between steps b) and c).   13 Support for at least one display panel (1) according to   any one of claims 1 to 12 having two edges   rectilinear (23), mutually parallel, of determined length (2), intended to be oriented substantially vertically, characterized in that it comprises on the one hand at least one set of two slides (44, 45, 46, 47) substantially vertical, mutually   united, having a substantially vertical dimension substantially-   ment equal to said determined length (1) and defining towards each other a respective substantially vertical channel (51) having a U-shaped section   in any horizontal plane and open downwards at the extreme level   respective lower halves (53) of said slides (44, 45, 46, 47) for receiving the substantially vertical sliding one, respective, of said edges (23), and on the other hand means (54, 55) for closing from said lower end (53) of at least one of said slides (44, 45, 46, 47), said closure means (54, 55) being mounted movable relative to said slides (44, 45, 46, 47) between a closed position of said lower end (53) and a release position thereof and can be immobilized temporarily with respect to said slides (44,, 46, 47) at least in said closed position said end lower (53).   14 Support according to claim 13, characterized in that said closure means (54, 55) comprise a flat frame (54, 55) articulated around a substantially horizontal axis (56, 57) at the respective upper ends (52) of said slides (44, 45, 46, 47), between a substantially vertical orientation in which it frames said slides (44, 45, 46, 47) and has opposite lower ends (53) thereof, under said lower ends (53), a substantially horizontal flange (62, 63) closing the latter downwards, and an oblique orientation relative to the vertical and in which said flange (62, 63) releases said lower ends (53) downwards, said frame (58, 59) being able to be immobilized temporarily with respect to said slides (44, 45, 46, 47) at least in said orientation substantially vertical.   Support according to any one of claims 13 and 14,   characterized in that it is intended to be placed in a fixed position above a floor (38) and for this purpose has means (39, 40, 41, 42) for rigid support of said slides (44, 45, 46, 47) relative to said ground (38), said means (39, 40, 41, 42) of rigid support preserving between said respective lower ends (53) of the slides (44, 45, 46, 47) and the ground (38) a distance which, measured substantially vertically, is at least   equal to said determined length (1).   16 Support according to any one of claims 13 to 15,   characterized in that it comprises two copies of said set of two slides (44, 45, 46, 47) and respective sealing means (54, 55) mutually independent, each slide (44, 45, 46, 47) of one of the games being juxtaposed with a respective slide (44, 45, 46, 47) of the other of said games, to support two display panels (1) oriented back (7) against back (7).