EP0613114A1 - Adhesive-free display means - Google Patents

Abstract

The invention relates to an aqueous mixture for wetting a display on paper comprising a thickener and a film-forming agent. It also relates to a support panel for a poster wetted with the aqueous mixture. Finally the invention relates to a method of placing a paper poster on a support panel without adding glue in situ.

Description

The present invention relates to the field of display, in particular advertising, and more particularly an aqueous mixture for wetting a paper poster, a poster support panel wetted by means of the above-mentioned aqueous mixture, and a method of implementation. of a poster on a support panel as mentioned above.

In the field of display panels, in particular for advertising purposes, we first sought to promote the take-off of the posters after an advertising campaign.

Thus, document EP-A-0 357 651 describes a means of fixing a poster by partial bonding to facilitate takeoff. According to this document, there is on the paper a uniform layer of hydrophobic materials promoting takeoff. Then there is a layer of an adhesive bonding product. At the end, the adhesive occupies only about 10% of the total surface glued. The steps for pre-processing paper using this method are long. However, in operation, the time between which the display receives the posters and the start of the display campaign is very short, or even zero. In fact such a process is not, or at least more, suitable.

According to document FR-A-2 423 272, the panel is treated with a paint containing granules and then is covered with a repellant. The poster is then glued only on a plurality of spherical surfaces of the granules although it is completely glued. The disadvantage of this method comes from the fact that the inter-sphere spaces fill up as and when display / display cycles. Eventually, the one-off collage effects are canceled and the completely glued poster adheres to the entire surface of the panel.

Document FR-A-2 069 573 relates for its part to a liquid adhesive composition containing hydrophobic particles so as to promote the take-off of the posters.

All these methods have a major drawback in that after removal of the poster, traces of paper and / or glue remain on the support panel.

Document FR-A-2 460 314 provides that there are between the panel and the display two distinct layers, one containing a nonionic polymer and the other a bionic polymer so as to ensure a reaction to the water when the poster took off. It is therefore necessary that the poster is sheltered from the rain, otherwise it risks peeling off on its own.

A first object of the invention is therefore constituted by a solution making it possible to leave a support panel free from any trace of paper and glue or the like after easy and rapid removal of the poster both in dry weather and in wet weather and not requiring significant poster preparation time.

In addition, the installation of a poster on a support panel requires the use of a long-handled broom, hitherto soaked with a liquid glue to spread on the support panel both before the installation of the poster only after the poster has been placed. Obviously, this results in a drop of liquid glue in line with the support panel, constituting thus, especially on sidewalks, poorly clean areas, particularly dangerous since they are slippery and cause environmental degradation. The fact remains that the displays have acquired a safe, fast and efficient technical gesture through the use of the long-handled broom.

To overcome the problem relating to glue drops, support panels have been developed allowing posters to be fixed without glue, for example by simple pinching, but these panels require the installation of protective glazing in front of the poster. Others have developed glue-permeable panels allowing the posters to be glued and taken off in the workshop as described in document FR-A-2 655 756. In all cases, the cost of the display is high. makes necessary manipulations.

A second object of the present invention is a solution making it possible to place a poster on a support panel according to the gestures and with the tools usually used by displays, but without using liquid glue in situ. The present invention achieves the two aforementioned objects and therefore presents considerable progress in the art.

According to a first aspect, the invention relates to an aqueous mixture for wetting a poster comprising in percentage by weight, between 3 and 15% of a film former chosen from the family of synthetic resins in aqueous dispersion, percentage indicated for a dry extract about 50%, and a thickener as a percentage by weight such that it gives the finished product a viscosity of between 10² and 10⁵ mPa.S (milliPascals X seconds).

Advantageously, the mixture can comprise, alone or as a mixture, a wetting agent, a peelable agent, an agent for protecting the film-forming agent against freezing, a preservative, a coalescing agent, and a water-repellent agent.

According to a second aspect, the invention relates to a poster support panel favoring the installation and take-off of posters wet in the aforementioned aqueous mixture. According to the invention, the panel is covered with a non-stick surface layer, that is to say at very low surface tension, chosen so that the force, applied perpendicular to the panel, necessary to separate the poster from the panel. , or between 0.01 and 0.2 N.cm⁻¹.

According to a third aspect, the invention relates to a method of placing a poster on a support panel as described above, the method comprising a step of wetting the folded poster and a step of placing the poster. on the support panel. According to the invention, the wetting step is carried out in the workshop in a bath comprising the above-mentioned aqueous mixture and the laying step is carried out without the addition of glue. Preferably, the folded poster is enclosed wet in a sealed package after the wetting step and before the fitting step. Thus it may take several days between the wetting step and the laying step.

The invention will be better understood and other objects, advantages and characteristics thereof will appear more clearly on reading the following description of a preferred embodiment given without limitation.

As previously indicated, the aqueous mixture for wetting the poster comprises a thickener and a film-forming agent. According to the invention, the aqueous wetting mixture comprises in percentage by weight between 3 and 15% of a film-forming agent chosen from the family of synthetic resins in aqueous dispersion, percentage given for a dry extract of approximately 50%, and a thickener. weight percentage as it gives the mixture a viscosity between 10² and 10⁵ mPa.S.

The thickener can be in particular, but not limited to, xanthan gum. Xanthan gum is a polysaccharide of natural origin obtained by fermentation in pure culture. In solution in water, the molecules of xanthan gum in the form of semi-rigid rods, become entangled and combine to form a complex network. This complex network is weakly bonded and the molecules constituting it can gradually be dissociated from each other under the effect of a shear force. Xanthan gum is generally used for its qualities as a suspending agent and as a thickener. In addition, as will be seen later, in cooperation with the support panel according to the invention, this xanthan gum makes it possible, when the poster is placed on the panel, to provide the glide necessary for adjusting the poster on the panel while ensuring a primary adhesion allowing the installation of the poster in the presence of strong wind. Xanthan gum has other advantages such as in particular the fact that it promotes the homogeneity over time of the aqueous wetting mixture by delaying the sedimentation of the film-forming agent.

An example of xanthan gum is marketed under the brand "RHODOPOL" by RHONE POULENC CHIMIE (Paris, France). With such a xanthan gum "RHODOPOL" the percentage by weight for the aqueous wetting mixture is between 0.1 and 0.7% to fall substantially within the desired viscosity range.

In addition xanthan gum "RHODOPOL" has the advantage of having a viscosity which decreases according to the agitation of the mixture in which it is found. Thus, during the step of wetting the folded posters, it is advantageous to create a stirring movement of the aqueous mixture. As a result, the viscosity of the mixture decreases and the penetration of the mixture into the folds of the poster is more effective and requires a shorter bathing time.

The film former is a synthetic resin in aqueous dispersion, chosen from the group of vinyl and acrylic derivatives, homopolymers or copolymers.

It may, for example, be vinyl acetates homopolymers plasticized or not, vinyl acetate copolymers maleic ester, acrylic or versatic, or styrene acrylic ester or butadiene, or terpolymers of acrylic acetate versatate or equivalent.

In an exemplary embodiment, the film former is an aqueous copolymer dispersion based on vinyl acetate and ethylene with a dry extract of the order of 60% as sold under the brand "VINAPASS EP 17" by the company WACKER .

In another embodiment, the film former is an aqueous copolymer dispersion without plasticizer. base of vinyl acetate and ethylene with a dry extract of about 50% as marketed under the brand "MOWILITH DM 140" by the company HOECHST.

In another exemplary embodiment, the film-forming agent is a mixture of several resins and in particular a mixture of the two previously mentioned resins.

Such a film former constitutes, in fact, a binder which dries naturally and cannot be rehydrated. The presence of xanthan gum, or equivalent, which is a hydrophilic product, in the aqueous mixture of the invention, makes it possible to maintain the humidity of the paper poster during the entire storage time before the display. Although generally used for bonding applications, the film-forming agent in the proportions indicated, namely between 3 and 15% of the aqueous mixture by weight for a dry extract of approximately 50%, poorly performs a bonding function. In fact, in the present application, it can be seen that a folded poster wetted in the aqueous mixture according to the invention and stored in a sealed place shows no trace of bonding paper on paper, due to the high humidity maintained in particular. by xanthan gum, or equivalent. However, as soon as the poster is placed on the appropriate support panel, and it begins to dehydrate, there is effective bonding paper on paper in the overlapped areas, any attempt to dissociate these areas causing tearing paper. Likewise, the sticking of a strip wet with the mixture on a poster already placed is effective after dehydration.

The above-mentioned aqueous mixture may further comprise a surfactant which is a wetting agent. This agent wetting facilitates the impregnation of the folded poster. It also ensures good sliding of the paper on the panel, in combination with the thickener. This gliding is necessary during the fine positioning of the poster panels. This agent also facilitates takeoff of the poster in wet weather by limiting adhesion.

In a nonlimiting embodiment, this wetting agent can be an ethoxylated nonylphenol sold under the brand "IGEPAL NP 10" by the company RHONE POULENC.

In another embodiment, the wetting agent used is a linear base alcohol sold under the trademark "ANTAROX FM 63" by the company RHONE POULENC. This wetting agent has the advantage of less foaming and preserving poster printing inks.

In these embodiments, the percentages by weight in the mixture of the wetting agent of the "IGEPAL NP 10" or of the "ANTAROX FM63" type are between 0.2 and 1%.

Advantageously, the mixture according to the invention comprises a coalescing agent. This agent has the function of facilitating the formation of the resin film by contributing to the welding of all the grains of the dispersion, especially at low temperature.

In a nonlimiting embodiment, this coalescing agent is butyldiglycol. Its proportion in the mixture is between 0 and 2% by weight of film-forming agent. Thereby the film forming temperature can be lowered significantly below 0 ° C.

The mixture according to the invention can also comprise a peelable agent. This agent facilitates the display without disturbing the adhesion of the poster.

In a nonlimiting embodiment, this peelable agent can be a product sold under the brand "ADDITOL VXL 1105" by the company HOECHST. The percentage by weight of a peelable agent of the "ADDITOL VXL 1105" type in the mixture is between 1 and 5% of the weight of film-forming agent.

Advantageously, the mixture according to the invention comprises a water repellency agent to facilitate the removal of the poster in wet weather and to prevent the paper from being too brittle. In this nonlimiting embodiment, the water-repellent agent can be a product sold under the brand "NOPCO 1097 A" by the company SIDOBRE SINNOVA. The percentage by weight of a water-repellent agent of the "NOPCO 1097 A" type in the mixture is between 0.3 and 2% depending on the intensity of the desired effect.

Advantageously, the mixture according to the invention is protected from attack by microorganisms by a preservative.

In a nonlimiting embodiment, the preservative is a food type preservative, therefore harmless to the user of the mixture. It protects the mixture from bacterial degradation greatly amplified by heat.

This preservative may for example be the preservative sold under the brand "METATIN 603K" by the company SCPI. In this case the percentage by weight of the preservative type "METATIN 603K" in the mixture is between 0.05 and 0.2%.

If the mixture according to the invention is used under temperature conditions below zero degrees celsius the gel substantially degrades the adhesive power of the film former and this permanently, even after thawing.

So as to guard against such a drawback both for the wetting mixture and on the panel before drying, the mixture may advantageously contain protection against freezing of the film-forming agent. In one embodiment, it is possible to use a protection sold under the brand "STABIGEL" by the company BOURRIGEAUD. The percentage by weight of "STABIGEL" type gel protection in the mixture is approximately 10% of the weight of dry resin extract.

In order to protect against freezing of the water contained in the mixture, calcium chloride is added to the mixture. The advantage of such an anti-freeze compared to a methanol-type anti-freeze is that it does not leak the printing inks from the poster.

• 0,3% de gomme xanthane "RHODOPOL" ;
• 5% de dispersion copolymère d'acétate de vinyle et d'éthylène "MOWILITH DM 140", 50% d'extrait sec ;
• 0,2% d'agent coalescent "BUTYLDIGLYCOL" ;
• 0,8% d'agent mouillant "IGEPAL NP 10" ;
• 0,2% d'agent protecteur du gel "STABIGEL D" ;
• 0,1% de conservateur "METATIN 603 K" ;

   et en pourcentage de poids de dispersion copolymère "MOWLITH DM 140" :
   - 2% d'agent de pelabilité "ADDITOL VXL 1105" ;
   le complément à 100% du mélange étant de l'eau.In a nonlimiting embodiment given by way of example, the mixture may preferably comprise substantially as a percentage by weight of the mixture:

• 0.3% "RHODOPOL" xanthan gum;
• 5% dispersion of copolymer of vinyl acetate and ethylene "MOWILITH DM 140", 50% of dry extract;
• 0.2% of "BUTYLDIGLYCOL" coalescing agent;
• 0.8% "IGEPAL NP 10" wetting agent;
• 0.2% protective agent for the gel "STABIGEL D";
• 0.1% "METATIN 603 K"preservative;

and as a percentage by weight of the "MOWLITH DM 140" copolymer dispersion:
- 2% peelable agent "ADDITOL VXL 1105";
the balance to 100% of the mixture being water.

Can also be added to this mixture of calcium chloride acting as an antifreeze for water, in percentage by weight depending on the temperature of use and / or a water-repellent agent.

According to the invention, the panel is covered with a non-stick surface layer, that is to say at very low surface tension, chosen so that the force, applied perpendicular to the panel, necessary to separate the poster from the panel, is between 0.01 and 0.2 N.cm⁻¹.

According to one embodiment, the support panel is constituted by a galvanized sheet, the face on which the poster will be applied is previously treated. This treatment normally includes a degreasing phase of this face, then the deposition of a bonding layer intended to attack the galvanized sheet on the surface. This bonding layer is generally produced using a phosphorus-based compound. This primer is then coated with a layer of decorative polyurethane paint and, before this layer is completely dried, with a silicone polyurethane acrylic varnish. The use of a polyurethane decorative paint makes it possible on the one hand to make the support panel attractive when it does not have a poster and, on the other hand, to promote the adhesion of the repellent varnish which, by its very nature , is difficult to apply. The treatment is completed by drying in the oven. An example of adhesion primer is sold under the brand name "BECKRYPRIM"; an example of polyurethane paint is sold under the brand name "BECKRYLAC" and an example of a suitable repellent varnish is sold under the name "Anti-graffiti varnish: reference JA 2368 VF"; these three products being marketed by BECKER INDUSTRIE (Montbrison, France).

Other products such as methylphenyl silicone resins, polytetrafluoroethylene or polyethylene coatings, polyester powder paints heavily loaded with waxes, can be used (methylphenile silicone resins: "RHODORSIL RESINE 6405 from RHONE POULENC).

In a preferred embodiment, the product used is a polyamide resin known under the brand "RILSAN" (polyamide 11 powder) and sold by ATOCHEM Puteaux France.

The reference chosen is: RILSAN ES BLANC 1477 MAC 3. For installation, the support panel in galvanized sheet is degreased with chlorinated solvents. Then the face intended to receive the poster is shot blasted (roughness SA 1/2). A primer based on 50% of 204 A and 50% of 104 B is applied with a layer thickness of 5 to 8 microns. Finally, RILSAN ES is applied, with a thickness of 110 to 140 microns. The support sheet is then baked in an oven at 200 ° C for 1/4 hour.

We know that the lifespan of an advertising-type poster is around 10 days and that we may prefer to remove the poster at the end of this lifespan, even if another poster should not be placed in its place and leave the paint on the support panel visible. Thus, the support panel can present variable indications or even a design pleasant to the view.

• Une étape de mouillage de l'affiche préalablement pliée est effectuée en atelier dans un mélange aqueux selon l'invention;
• Ensuite, de façon favorable, l'affiche pliée est stockée dans un emballage étanche, de manière à maintenir l'affiche pliée dans une atmosphère présentant un taux d'hygrométrie élevé, évitant une déshydratation rapide du produit de mouillage;
• L'affiche pliée emballée est amené sur le site du panneau-support au début de la campagne d'affichage, puis posée simplement sur le panneau selon le procédé habituel à l'aide d'un balai pourvu d'un long manche favorisant le dépliage et le réglage par simple glisse sur le panneau, mais sans adjonction de colle. Les différentes parties de l'affiche sont disposées comme usuellement à recouvrement pour former l'affiche complète.

According to a third aspect, the invention relates to a method of displaying a poster on such a support panel. According to this process:

• A step of wetting the previously folded poster is carried out in the workshop in an aqueous mixture according to the invention;
• Then, in a favorable manner, the folded poster is stored in a sealed package, so as to keep the folded poster in an atmosphere having a high humidity level, avoiding rapid dehydration of the wetting product;
• The folded packaged poster is brought to the site of the support panel at the start of the poster campaign, then simply placed on the panel according to the usual method using a broom provided with a long handle favoring unfolding. and adjustment by simply sliding on the panel, but without adding glue. The different parts of the poster are arranged as usual with overlap to form the complete poster.

The step of wetting the folded poster will advantageously comprise stirring the aqueous wetting mixture based on xanthan gum in order to fluidize said mixture and thus obtain better impregnation of the heart of the folded poster in a time d much shorter immersion.

Advantageously, the wet poster ready for installation will contain between 0.15 and 0.25 liter.m² of mixture, depending on the quality of the paper and the degree of drainage. Preferably, the wet poster ready for installation will contain 0.2 liter.m² of mixture.

Watertight storage can be individual storage in a plastic bag or grouped in a watertight box comprising all or part of the posters intended to be placed in the same laying tour.

In the case of temperatures well below 0 ° C, the poster installer may advantageously, before installation, coat using the installation brush, the panel with a solution having a high concentration of calcium chloride.

After the poster has dried, it adheres perfectly to the support panel.

At the end of the advertising campaign or prior to the installation of a new poster, the poster can be removed by peeling or using a squeegee made of a material capable of not scratching the surface of the panel. The remarkable effect of the invention is that the traces of the aqueous mixture of the wetting remain adherent to the poster paper, due to the strong affinity of the wetting product for the paper, while the support panel remains absolutely clean and ready for a new installation, without trace neither of the torn off paper, nor of any adhesive product.

It is thus found that there was no need for glue in situ to ensure the adhesion of the poster. Therefore, obviously the area under the support panel remains clean of any dangerous trace, without any degradation of the environment.

Although only a few embodiments of the invention have been described, it is obvious that any modification made in the same spirit by a person skilled in the art, would not go beyond the scope of the present invention as defined here.

For example, the proportions of the constituent components of the mixture have been given in relation to the products given as examples. It is obvious that the use of equivalent products but not having the same concentration or the same dry extract does not depart from the scope of the invention. The new proportions are then obviously calculated by simple rule of three with the products given as an example in the description as a reference.

For example 3 to 15% of a film former with 50% dry extract is equivalent to 6 to 30% of a film former with 25% dry extract.

Claims (20)

Aqueous mixture for wetting a paper poster, characterized in that it comprises, in percentage by weight, between 3 and 15% of a film former chosen from the family of synthetic resins in aqueous dispersion, percentage given for a dry extract of of the order of 50%, and a thickener as a percentage by weight in the mixture such that it gives the mixture a viscosity of between 102 and 10⁴ mPa.s. Aqueous mixture according to claim 1 characterized in that the thickener is a xanthan gum having a percentage by weight in the mixture of between 0.1 and 0.7% of the mixture, and preferably of the order of 0.3%. Aqueous mixture according to either of Claims 1 and 2, characterized in that the said film-forming agent is a synthetic resin in aqueous dispersion, chosen from the group of vinyl and acrylic derivatives, homopolymers or copolymers, in particular from a group comprising vinyl acetates homopolymers , vinyl acetate copolymers, maleic, acrylic or versatic ester, styrene acrylic or butadiene ester, terpolimers of acrylic acetate versatate, polyvinyl alcohol, or mixtures thereof. Aqueous mixture according to any one of Claims 1 to 3, characterized in that the film-forming agent is an aqueous copolymer dispersion without plasticizer based on vinyl acetate and ethylene having a percentage by weight of mixture on the order of 5% , percentage given for a dry extract of 50%. An aqueous mixture according to any one of the preceding claims, characterized in that it further comprises at least one component chosen from surfactants, water-repellent agents, coalescing agents, peelers, preservatives, protectors against film-forming gel, anti-freeze, or mixture thereof. Aqueous mixture according to any one of the preceding claims, characterized in that it further comprises at least one surfactant or wetting agent, in particular of ethoxylated nonylphenol type or linear base alcohol having a percentage by weight of between 0.2 and 1% of the mixture, and preferably of the order of 0.8%. Aqueous mixture according to any one of the preceding claims, characterized in that it also comprises at least one coalescing agent of the butyldiglycol type having a percentage by weight of between 0% and 2% of the film-forming agent, and preferably of order of 1%. Aqueous mixture according to any one of the preceding claims, characterized in that it further comprises at least one peelable agent facilitating the disallowing without disturbing the adhesion of the poster, this peelable agent having a percentage by weight included between 1 and 5% of the weight of film-forming agent, and preferably of the order of 2%. Aqueous mixture according to any one of the preceding claims, characterized in that it further comprises at least one preservative, in particular of the food type, protecting the mixture from degradation by microorganisms, this preservative having a percentage by weight of between 0.05 and 0.2% of the mixture, and preferably of the order 0.1%. Aqueous mixture according to any one of the preceding claims, characterized in that it further comprises at least one protection against freezing of the film-forming agent, said protection having a percentage by weight of approximately 10% of the dry extract of the film-forming agent in the mixture. Aqueous mixture according to any one of the preceding claims, characterized in that it further comprises at least one anti-freeze for the water in the mixture, of the calcium chloride type. Aqueous mixture according to any one of the preceding claims, characterized in that it also comprises at least one water-repellent agent having a percentage by weight of between 0.3 and 2% of the mixture and preferably of the order of 0, 5%. Support panel for posters wetted by means of an aqueous mixture according to any one of the preceding claims, characterized in that it is provided with a non-stick surface layer such that the dry poster dissociates from the panel -support under the action of a force, perpendicular to the support panel, between 0.01 and 0.2 N.cm⁻¹, and preferably of the order of 0.1 N.cm⁻¹. Support panel according to claim 13 characterized in that the non-stick layer is chosen from silicone resins; polyamide resins, silicone polyurethane acrylic varnishes, polyester powder paints heavily loaded with wax, methylphenile silicone resins, polytetrafluoroethylene or polyethylene coatings. Method of displaying a poster on a support panel, characterized in that it comprises: - A step of wetting the poster in a wetting mixture according to any one of claims 1 to 11 carried out in the workshop; a step of packaging the wet folded poster in a sealed package; - a possible stage of storage of the folded, wet, and packaged poster until the start of the installation campaign; - a glue-free installation step of the unpacked and wet poster in situ, according to the usual unfolding and adjustment techniques for the poster; and - a drying step for the poster displayed. A method according to claim 15 characterized in that, during the wetting step, the mixture undergoes mechanical or manual stirring. Method according to claim 15 or 16 characterized in that the poster at the end of the wetting step contains between 0.15 and 0.25 liter.m⁻² of mixture, and preferably 0.2 liter.m⁻². Method according to any one of Claims 15 to 17, characterized in that several wet folded posters are packed in the same waterproof case. Process according to any one of Claims 15 to 18, characterized in that it comprises, in the event of temperatures below 0 ° C of the support panel, a step prior to the step of placing the poster where the support panel is coated with an aqueous solution with a high concentration of calcium chloride or equivalent using the laying brush. A method according to any one of claims 15 to 19 characterized in that at the end of the advertising campaign or prior to the installation of a new poster, the poster is removed by simple peeling using a squeegee produced in a material that does not scratch the surface of the backing board.