FR2702073A1 - Display device without glue. - Google Patents

Abstract

The invention relates to an aqueous mixture for wetting a poster on paper comprising xanthan gum and a film former. It also relates to a support panel treated in particular by coating with a layer of polyurethane paint and a layer of repellent varnish. Finally, the invention relates to a method of placing a paper poster on a support panel without adding glue in situ.

Description

DISPLAY DEVICE WITHOUT GLUE

  The present invention relates to the field of display including advertising, and more particularly an aqueous wetting mixture of a paper poster, a wet poster board-support panel with the aforementioned aqueous mixture, and a method of setting

  place a poster on a support panel as mentioned above.

  In the field of billboards especially for advertising purposes, it was first sought to promote

  the takeoff of the posters after an advertising campaign.

  Thus, the document EP-A-0 357 651 describes a means of fixing a poster by partial gluing to facilitate takeoff. According to this document, there is available on the paper a uniform layer of hydrophobic materials favoring take-off. a layer of a bonding adhesive product At the end, the adhesive does not occupy

  approximately 10% of the total area glued.

  According to the document FR-A-2 423 272, the panel is treated with a paint containing granules and is then coated with a repellent product. The poster is then glued on a plurality of spherical surfaces of the granules. it is fully glued Document FR-A-2 069 573 relates for its part a liquid adhesive composition containing hydrophobic particles so as to promote the take-off of the posters FR-A-2 460 314 provides that it is available between the sign and the poster

  two separate layers, one containing a non-

  ionic and the other a bionic polymer so as to ensure a reaction to water during the take-off of the poster. All these methods have a major disadvantage in that after removal of the poster, there remain

  traces of paper and / or glue on the support panel.

  A first object of the invention is thus constituted by a solution allowing to leave a support panel free of any trace of paper and glue or other after removal of the poster both in dry weather than by

humid weather.

  In addition, the installation of a poster on a sign-

  support requires, so far, the use of a long-handled broom soaked with a liquid glue spread on the support panel both before the installation of the poster after the installation of the poster It results obviously a drop of liquid glue to the right of the support panel, thus constituting, especially on the sidewalks, bad-clean areas, particularly dangerous since slippery and determining a degradation of the environment to overcome this problem, we developed panels -support to fix posters without glue, for example by simply pinching, but these panels require the installation of a protective glass in front of the poster Others have developed glue permeable panels to achieve the collage and the lift-off

  posters in the workshop as described in document FR-A-

  2,655,756 In all cases, the cost of the display is

  high because of the necessary manipulations.

  The present invention has for its second object a

  solution to put a poster on a sign-

  without the aid of liquid glue in situ The present invention achieves the two aforementioned objects and therefore has

  a considerable advance in art.

  According to a first aspect, the invention relates to an aqueous wetting mixture of a poster comprising, as a percentage by weight, between 0.1 and 0.7% of xanthan gum and between 5 and 15% of a film-forming agent chosen from the family. synthetic resins in aqueous dispersion Preferably, this mixture comprises of the order of 0.4% xanthan gum and 10% of the film-forming agent. Preferably, this film-forming agent is a vinyl binder. In addition, it can

  include a solvent plasticizer of the base film former.

  Finally, the mixture may also comprise a surfactant, a bactericidal preservative, an anti-freeze or mixtures of

these components.

  According to a second aspect, the invention relates to a poster-support panel promoting the installation and take-off of wet posters in the aforementioned aqueous mixture. According to the invention, the panel is constituted by a galvanized sheet successively coated with a layer of bonding, a layer of a primer, a layer of decorative paint and a layer of a varnish

  repellent such as a silicone polyurethane varnish.

  According to a third aspect, the invention relates to a

  method of setting up a poster on a sign-

  support as described above, the method comprising a step of pre-wetting the folded poster and a step of placing the poster on the support panel According to the invention, the pre-wetting step is performed in the workshop in a bath comprising the aforementioned aqueous mixture

  and the laying step is performed without adding glue.

  Preferably, the poster is enclosed pre-wetted in a sealed package after the pre-wetting step and before the laying step Thus it may take several days

  between the pre-wetting step and the laying step.

  The invention will be better understood and other purposes, advantages and features thereof will appear more

  clearly on reading the following description of a

  preferred embodiment given without limitation.

  As previously indicated, the aqueous wetting mixture of the poster, comprises xanthan gum and a film-forming agent. 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, entangle and combine to form a complex network This complex network is weakly bonded and the molecules constituting it can progressively be dissociated

  each other under the effect of a shearing force.

  Xanthan gum is generally used for its suspending agent qualities and as a thickener. In its application to the aqueous wetting mixture of a paper poster, the very fine molecules of the xanthan gum are partially absorbed by the paper. Furthermore, as will be seen later, in cooperation with the support panel according to the invention, this xanthan gum allows during the installation of the poster on the panel to ensure the glide and ad hoc adherence of the poster on the panel An example of xanthan gum is marketed under the brand name "RHODOPOL" by RHONE POULENC

CHEMISTRY (Paris, France).

2702073

  The film-forming agent is chosen from the family of synthetic resins in aqueous dispersion. It may, for example, be vinyl acetate homopolymers, whether plasticized or not, vinyl acetate maleic, acrylic or versatic vinyl acetate copolymers, or styrene acrylic ester or butadiene, or terpolymers of acetate versatate

acrylic or equivalent.

  In an exemplary embodiment, the film-forming agent is a nonionic aqueous dispersion of vinyl acetate homopolymer viscous and unplasticized as used to ensure a bond, for example marketed under the trademark "RHODOPAS" by RHONE POULENC CHIMIE (Paris La

Defense, France).

  Such a film-forming agent constitutes, in fact, a binder which dries naturally and can not be rehydrated. The presence of xanthan gum, which is a hydrophilic product, in the aqueous mixture of the invention makes it possible to maintain the hygrometry of the poster by paper paper for all the time required Although generally used for adhesive applications, the film-forming agent in the proportions indicated, ie between 5 and 15% of the aqueous mixture by weight, does not provide a bonding function.

  effect in the present application, that a poster

  wetted in the aqueous mixture which has been described, can be folded without there being any trace of paper bonding paper, because of the high humidity maintained by particular xanthan gum However, since the poster is placed on the appropriate support panel, and that it has dehydrated, there is effective paper-to-paper bonding in the overlapping areas, any attempt to separate these areas causing tearing of the paper. When the film-forming agent is an unplasticized binder, it may be advantageous to add a plasticizer in an amount equal to or less than the binder. Such plasticizers may be chosen from the group comprising phthalates, maleates, sebacates, trimellitates or equivalent and The essential advantage of the presence of a solvent plasticizer of the base binder is that it allows a certain flexibility to the filmogene; and in addition, promotes the adherence of the poster on the

  support panel and its subsequent removal.

  As is customary, the aforementioned aqueous mixture may further comprise a surfactant which is a wetting agent, a bactericidal type preservative, in particular

  if the aqueous mixture is kept for several days, an anti-

  methanol-type gel or, preferably, calcium chloride, if the mixture is used in an environment likely to reach low temperatures, and

mixtures thereof.

  According to another aspect of the invention, the

  support is conventionally constituted by a galvanized sheet, the face on which the poster will be applied is previously treated This treatment normally comprises a degreasing phase of this face, then the deposition of a bonding layer intended to attack in surface galvanized sheet This layer of attachment is usually made using a compound based on phosphorus Then the face intended to receive the poster is coated with a layer of a primer adhesion, then a layer of decorative paint and, before drying of this layer, a repellent varnish, for example a silicone polyurethane acrylic varnish, because of its durability The use of a decorative polyurethane paint allows on the one hand to make the support panel attractive when it is devoid of poster and, secondly, to promote the adhesion of the repellent varnish which, by its very nature, is difficult to apply The treatment is completed by oven drying An example of adhesion primer is marketed under the trademark "BECKRYPRIM"; an example of polyurethane paint is marketed under the trademark "BECKRYLAC" and an example of suitable repellent varnish is marketed under the name "Antigraffiti varnish: reference JA 2368 VF"; these three products being marketed by BECKER INDUSTRIE (Montbrison,

  France) and BICHON SA (Montbrison, France).

  We know that the lifespan of an advertising type poster is of the order of 10 days and that we can prefer after this lifetime remove the poster, even if another poster should not be put in its place and leave the paint of the support panel visible. Thus, the support panel may have variable indications.

  or even a drawing pleasing to view.

  We thus obtain a method of setting up a poster on such a support panel. According to this method, a pre-wetting step of the previously folded poster is carried out in the workshop in the aqueous mixture which has just been described. in a favorable manner, the poster is enclosed in a sealed plastic bag-like packaging, so as to maintain the poster in an atmosphere with a high hygrometry rate, avoiding rapid dehydration of the wetting product. folded poster is then brought to the site of the support panel possibly after a few days of storage The poster is then removed from the bag and simply placed on the panel according to the usual method using a broom provided with a long handle promoting the unfolding by simply sliding on the panel, but without adding glue The different parts of the poster are arranged as usually overlapping to form the complete poster . After drying the poster, it adheres

perfectly to the support panel.

  At the end of the advertising campaign, the poster is removed by peeling by simple dry scraping. The remarkable effect of the invention is that the traces of the aqueous mixture of the wetting remain adherent to the paper of the poster, because the molecules of xanthan gum

  were absorbed by the paper, while the

  The support remains absolutely clean and ready for a new installation, without any trace of paper torn off, or any other

adhesive product.

  It can thus be seen that there was no need for glue in situ to ensure the adherence of the poster. Therefore, of course, the area under the support panel remains clean of any dangerous trace, without degradation.

none of the environment.

  Although only the preferred embodiment of the invention has been described, it is obvious that any modification made in the same spirit by those skilled in the art would not be outside the scope of the present invention.

as defined here.

Claims (9)

  An aqueous wetting mixture of a paper poster characterized in that it comprises, in percentage by weight, between 0.1 and 0.7% of xanthan gum and between 5 and% of a film former selected from the family of resins   synthetic in aqueous dispersion.   2 aqueous mixture according to claim 1 characterized in that it comprises, preferably, of the order 0.4% xanthan gum.   3 aqueous mixture according to claim 1 or 2, characterized in that it comprises, preferably, of the order 10% of said film-forming agent.   4 aqueous mixture according to one of claims 1   characterized in that said film-forming agent is a binder selected from the group consisting of homopolymeric vinyl acetates, maleic, acrylic or versatic vinyl acetate copolymers, acrylic or butadiene ester styrene, acrylic versatate acetate terpolimers, polyvinyl alcohol, or mixtures thereof.   Aqueous mixture according to claim 4 characterized in that it further comprises a solvent plasticizer of said binder in an amount less than or equal to that said binder.   Aqueous mixture according to claim 5 characterized in that said plasticizer is selected from the group consisting of phthalates, maleates,   sebacates, trimellitates and mixtures thereof.   Aqueous mixture according to any one of   preceding claims characterized in that   further comprises at least one component selected from surfactants, bactericidal preservatives and   antifreezes, and mixtures thereof.   8 Signpost for wet posters using the   aqueous mixture according to any one of the claims   previous, said panel being constituted by a galvanized sheet characterized in that it is successively coated: a bonding layer, a layer of a bonding primer, a layer of a decorative paint , and a layer of a repellent varnish.   9 support panel according to claim 8 characterized in that said repellent varnish is a silicone polyurethane.   Method of setting up a poster on a support panel, comprising a pre-wetting step and a laying step of the sign on said support panel, characterized in that the pre-wetting step is performed in a workshop in a bath comprising an aqueous mixture according to any one of claims 1 to 7; and   that the laying step is performed without adding glue.   11 Process according to claim 10 characterized in that, between the pre-wetting step and the laying step, the poster is enclosed pre-wetted in a sealed package.