WO2011004171A1

WO2011004171A1 - Window display panel

Info

Publication number: WO2011004171A1
Application number: PCT/GB2010/050747
Authority: WO
Inventors: John Pitt
Original assignee: Agripaflex Limited
Priority date: 2009-07-06
Filing date: 2010-05-07
Publication date: 2011-01-13

Abstract

The invention provides a display system (200, 300) for a window, comprising a mesh display panel (202) having display information, for example an advertisement, printed on one side and a number of adhesive fasteners (204, 304) adapted to adhere the panel to the internal surface of a window (320), such that the display information can be seen from outside the window. The mesh display panel (202) is a woven mesh having apertures and a porosity of at least 10%, and the adhesive fasteners (204, 304) comprise adhesive strips having a carrier (100), a first high tack adhesive (102) which penetrates into the apertures of the mesh and adheres the adhesive strip to the panel (202), and a second low tack adhesive (104) adapted to adhere to the window (320). The first adhesive (102) has a tack measured by the loop tack test of DIN EN 1945 greater than that of the second adhesive (104), or a peel strength according to DIN EN 1939 greater than that of the second adhesive (104). The panel (202) can be easily removed and replaced, since when peeling the panel from the window the adhesive fasteners (204, 304) remain attached to the panel and leave no residue on the window. The mesh includes apertures so that the mesh is not opaque, and a person inside a building (330) can see through the mesh on a window to the outside. However, from outside the building (330) the display information is clearly visible.

Description

Window Display Panel

The present invention is directed to a display system or assembly for displaying information on a transparent or translucent surface such as a window, glass door or the like.

It is known to provide graphic displays for windows and the like which display information or an image when viewed in one direction but at the same time minimise disruption to the view or light passing through the display in the opposite direction. Such displays are known as "see- through" or "one-way" displays and are commonly used for advertising, information displays and signage. The displays are based on self- adhesive transparent plastic films, which can have information printed on one or both sides thereof. Once printed, the film is adhered to a suitable transparent or translucent panel such as a window or a glass door panel, for example. Thus, where a single sided display is applied to a window in a telephone box or a taxi, for example, the occupant inside has a relatively uninterrupted view out but passers-by will view the image printed on the other side of the display. Alternatively, the display may have different images printed on either side of the film, but those images are only visible from their respective sides of the film.

As they are self-adhesive, such display films can be difficult to apply unless by experienced and skilled personnel. If the film is not applied correctly, air bubbles can be left between the film and the surface to which it is being applied, detracting from the appearance of the display. A further problem is that the films typically leave residue on the glass when they are removed. This residue is unsightly and must then be cleaned off. The application and removal of such films therefore involves an amount of time and effort which may be unjustified if the display is intended to be on view for only a short period of time. Additionally, it is near-impossible to peel off these films as one complete panel. Thus, it is not normally possible to reuse the film again once it has been removed from the glass, as it has usually been torn or crumpled during the removal process. Such films are therefore only intended for a single use.

It is known to place posters in windows. Posters are normally printed on paper and may be adhered to a window by adhesive tape. The poster may be adhered to the inside of the window, so that the information printed on the poster is visible from the outside of the window. However such posters suffer from the disadvantage that they obscure visibility through the window from the inside. Moreover when it is dark outside, it can be difficult to read or see the information printed on the poster, even if the interior of the building behind the window is illuminated.

It is an aim of the present invention to obviate or mitigate one or more of the aforementioned disadvantages.

According to a first aspect of the present invention there is provided a display system for a window, the system comprising:

a mesh display panel having display information printed on at least one side thereof; and

a fastening means comprising a plurality of adhesive fasteners adapted to adhere the panel to a surface of a window;

wherein the mesh display panel is a woven mesh having a porosity of at least 10%, and

wherein the adhesive fasteners comprise adhesive strips having a first adhesive on a first side adhering the adhesive strip to the panel and having a second adhesive on a second side adapted to adhere to the surface of a window, the first adhesive having a higher tack than the second adhesive.

The display information may comprise text, images, an advertisement, or a combination thereof.

The mesh includes apertures. The porosity is defined as the proportion of the total surface area of the mesh which comprises apertures which are open to air.

The porosity may be in the range 10% to 50%, preferably in the range 20% to 40%. If the porosity is too large the display information is not clearly visible. The first adhesive may at least partially penetrate into the apertures of the mesh.

The second adhesive on the second side adapted to adhere to the surface of a window may be adapted to permit removal and re-adhesion of the mesh display panel to a window. The adhesive fasteners may include a release paper covering the second adhesive on the side adapted to adhere to the window. The release paper may include a tab portion adapted to aid removal of the release paper from the adhesive strip. Preferably the first adhesive has a tack measured by the loop tack test of DIN EN 1945 greater than that of the second adhesive. Preferably the first adhesive has a peel strength according to DIN EN 1939 greater than that of the second adhesive. The first adhesive may have a tack measured by the loop tack test of DIN EN 1945 of between 20 and 80 N/12.5 cm. The first adhesive may have a peel strength according to DIN EN 1939 of between 18 and 35 N/25 mm. The second adhesive may have a tack measured by the loop tack test of DIN EN 1945 of between 1 and 10 N/12.5 cm. The second adhesive may have a peel strength according to DIN EN 1939 of between 7 and 13 N/25 mm. The display system may further comprise a window to which the mesh display panel is secured. The mesh panel may be secured to the inner or outer surface of the window.

The adhesive fasteners may be substantially transparent.

The mesh display panel may have an upper edge, a lower edge and a pair of lateral edges, and the adhesive fasteners may be provided at the upper and lower edges. In particular, the panel may comprise two adhesive fasteners, which extend substantially along the upper and lower edges respectively.

The mesh display panel may be of woven or knitted polyester or other suitable fabric coated with PVC. The spacing of the fibres in the fabric is such that even after coating apertures remain in the mesh to give the required porosity. Typically the mesh display panel may contain apertures of at least 0.5mm² in area.

The mesh display panel may be cut from a larger roll of mesh material. The mesh display panel may have untreated cut edges. According to a second aspect of the invention there is provided a method of mounting a display system according to the first aspect in a window, the method comprising:

using the adhesive fasteners to secure the mesh display panel to a surface of a window in a structure enclosing a space.

The space may be a building structure, a room in a building or the interior of a vehicle. The panel may be secured to an internal surface of a window and may be arranged on the window such that the display information is printed on the side adjacent the window and is visible from outside the window.

Alternatively the panel may be secured to an external surface of a window and may be arranged on the window such that the display information is printed on the side facing away from the window and is visible from outside the window.

The method may include the step of illuminating the space, such that the display information is visible from outside the window, for example to people outside the building or vehicle, through illumination by light passing through the apertures in the mesh.

In an alternative arrangement, the panel may be secured to an external surface of a window and may be arranged on the window such that the display information is printed on the side facing away from the window and is visible from inside the window and from within the space, such as a room or vehicle. Alternatively the panel may be secured to an external surface of a window and may be arranged on the window such that the display information is printed on the side adjacent the window and is visible from inside the window and from within the space, such as a room or vehicle.

Preferred embodiments of the present invention will now be described by way of example only with reference to the accompany drawings, in which:

Fig 1 shows a display system according to the invention in a window;

Fig 2 shows the display panel of the system of Fig 1 ; and

Figs 3 and 4 show further embodiments of display panels which can be used in the system of Fig 1 ;

Fig 5 shows a display system according to a further embodiment the invention in a window;

Fig 6 shows the display panel of the system of Fig 5; and

Fig 7 is a partial cross-sectional view through the panel of Fig 1.

Referring to Figs 1 and 2 there is shown an embodiment of a display system according to the invention.

In Fig 1 there is shown a view from inside a building looking out of a window frame 210, in which are mounted two windows. The left hand window 220 has a mesh display panel 200 affixed to the inside of the glass. The mesh display panel 200 is shown in Fig 2, and comprises a cut rectangular panel of mesh 202. The mesh may be a coated mesh fabric such as seemee® mesh supplied by Verseidag-lndutex GmbH. Suitable meshes are seemee® premium B3127 and extra B3131. Typically the mesh is a woven or knitted polyester fabric coated with PVC, which allows the mesh to be printed. The image can be any image, for example a licensed image of a footballer (as shown) or film character, photograph, campaign poster, advertisement, slogan etc. The mesh includes apertures so that the mesh is not opaque, and a person inside the building can see through the mesh to the outside. However the image on the display panel remains visible to the person inside the building, if the panel is orientated with the image to the inside, as shown in Fig 1. Alternatively the panel 200 can be orientated so that the image faces outside. In such circumstances, the side of the panel with the image is adhered directly to the glass of the window 220. In such circumstances, a viewer outside the building can see the printed image, but cannot see easily into the building. A person inside the building can continue to see through the mesh display panel to the outside.

If the room is illuminated and it is dark outside, a viewer outside can still see the image, because light passing through the apertures in the mesh 202 tends to illuminate the image printed on the external face of the mesh panel 200.

The mesh panel 200 is secured to the glass of the window 220 by adhesive fasteners. In Fig 2 the adhesive fasteners 204 are lengths of double sided pressure sensitive adhesive tape. The construction of the tape can be seen more clearly in Fig 7, which shows the tape 204 adhered to the mesh 202. The warp fibres 242 of the mesh 202 are shown in cross section, while the weft fibres are visible behind.

The double-sided pressure sensitive adhesive tape 204 includes a transparent carrier 100 and two different adhesives 102, 104. The carrier 100 is typically a polyester or PET film of between 10 and 20 μm

thickness. Alternatively the carrier material may be PVC or polypropylene. The first adhesive 102 adapted to adhere to the mesh panel 202 is a dispersion acrylic adhesive, typically between 5 and 250 μm thickness, preferably between 50 and 100 μm thickness. Typically the adhesive should be applied at a coating weight of at least 70 g per m², and tests have shown that a coating weight in the range of 100 to 125 g per m² produces a satisfactory bond with the mesh panel. The second adhesive 104 adapted to adhere to the surface of the window 220 comprises a resin modified solvent-based acrylic adhesive, typically between 5 and 250 μm thickness, preferably between 30 and 100 μm thickness. The second adhesive 104 is covered by a release paper 206, typically between 50 and 150 μm thickness, preferably between 60 and 100 μm thickness. Any suitable release paper can be used, for example PE-coated paper, crepe, or a film liner such as PP, HPDE or PET.

The adhesive tape 204 is supplied in roll form, and the first adhesive is on the open side of the tape, so that the tape can be cut to length and placed on the edge of the mesh sheet 202, for example by an automatic cutting and rolling machine.

The tape allows clean and residue-free release from one side, where the second adhesive 104 contacts the glass window, while the formulation of the first adhesive 102 on the open side of the adhesive tape is

"aggressive" so that the first adhesive has a relatively high tack. Typically the tack measured by the loop tack test of DIN EN 1945 is between 20 and 80 N/12.5 cm. Typically, depending on the particular mesh substrate used, the peel strength according to DIN EN 1939 after short-term storage (10 minutes) at room temperature is between 18 and 35 N/25 mm. It can even increase slightly after storage.

The second adhesive 104 has a relatively low tack. Typically the tack measured by the loop tack test of DIN EN 1945 is between 1 and 10 N/12.5 cm. Typically the peel strength according to DIN EN 1939 after short-term storage (10 minutes) at room temperature is between 7 and 13 N/25 mm. At the same time the second adhesive 104 shows high cohesion, thus making this side easily removable from many materials without leaving any residues.

The weaker, low tack second adhesive 104 is typically prepared by radical copolymerisation of acrylic monomers in solvent with the help of a starter and addition of a catalyst/curing agent. Suitable pressure sensitive adhesive materials comprise those including at least one copolymerized monofunctional (meth)acrylic acid ester of a nontertiary alcohol in which the alkyl group contains about 4 - 14 carbon atoms on average in an amount between about 50 and 85 weight-%.

In addition the pressure sensitive second adhesive 104 can contain at least one co-polymerized, mono-functional, ethylenically unsaturated reinforcing monomer in an amount between about 10 and 30 weight-%.

The expression "monofunctional (meth)acrylic acid ester" refers to a mono(meth)acrylic monomer or a monomer containing one (meth)acrylic functionality. Especially useful examples of monofunctional (meth)acrylic acid esters are, among others, 2-methylbutyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, isooctyl acrylate or n-decyl acrylate.

Monofunctional reinforcing monomers are, among others, (meth)acrylic acid or a (meth)acrylate like 2-hydroxyethyl acrylate or methacrylate isobornyl acrylate, 2-phenoxyethyl acrylate, cyclohexyl acrylate, phenyl acrylate or t-butyl acrylate. By way of example only, other monomers which may be used are (meth)acrylamide or a vinyl ether. Useful curing agents in the production of the pressure sensitive adhesive are mixtures of liquid polyfunctional isocyanates.

The adhesive mass is produced by mixing the different monomers in the desired proportions and by then polymerizing this mixture in a suitable organic solvent such as tertiary butyl alcohol, isopropyl acetate, ethyl acetate, cyclohexane or acetone or the like, alone or mixed with another with the addition of a suitable catalyst or starter for the radical

polymerisation, for example an azo compound or a peroxide.

The high tack first adhesive 102 mass is typically formed as a high solids, low viscosity and low VOC aqueous acrylate copolyomer emulsion on the basis of a carboxyl groups containing acrylic acid ester and vinyl ester. It is characterised by an excellent tackifier response, further increasing its adhesion to a variety of surfaces while maintaining great cohesion. The adhesive has a very good adhesion on corrugated paper, low energy surfaces like rigid and filmic HDPE and LDPE, polypropylene, polyester and rigid PVC, making it particularly suitable for PVC coated polyester mesh. The combination of tack, cohesion and adhesion, as well as the wide temperature range of usage, makes the adhesive mass especially desirable for permanent display panel applications. Its natural adhesion and tack is enhanced by the use of an aqueous, solvent free resin dispersion based on rosin acid. Use of this dispersion prevents discoloration of the adhesive. Adhesion may with individual fibres in the mesh may also be improved by partial foaming of the first adhesive 102.

The first adhesive 102 mainly consists of nontertiary alkyl acrylates of alkanols of 8 to 12 carbon atoms and of acrylates or methacrylates of alkanols of 1 to 4 carbon atoms and/or vinyl esters of carboxyl ic acids of 2 to 4 carbon atoms and/or (meth)acrylonithle and/or styrene. Particularly suitable nontertiary alkyl acrylates of alkanols of 8 to 12 carbon atoms are isooctyl acrylate, 2-ethylhexyl acrylate, n-decyl acrylate, n-octyl acrylate or n-dodecyl acrylate. Particularly important vinyl esters of carboxylic acids of 2 to 4 carbon atoms are those of straight chain carboxylic acids, for example vinyl avetate, vinyl propionate or vinyl-n butyrate, but mixtures of such vinyl esters may also be used.

The first adhesive 102 may further contain minor amounts of common additives like wetting agents, fillers and colorants, thickeners, defoamers, emulgators or stabilizers.

The panel 200 is supplied with one side of the tape already adhered to the mesh 202, and the other side of the tape 204 covered by a release paper 206. The tape 204 is typically 10 or 20 mm in width, although any suitable width of tape may be used. In order to fix the panel 200 to the window

220, the release paper 206 is pulled away from the adhesive fastener 204 at the top of the panel, and the top of the panel is located on the glass of the window 220. The panel 200 is then pulled down flat before pulling the release paper 206 at the bottom of the panel adhering the bottom fastener 204 to the glass of the window 220.

The first adhesive 102 on the side of the adhesive tape 204 closest to the mesh 202 has a higher tack than the second adhesive 104 which is adapted to adhere to the window. This has the advantage that if the panel 200 is removed from the window 220, the adhesive tape will remain adhered to the mesh 202, and will not remain on the glass, so that the display panel 200 can be reused. The release paper 206 may include a tab portion to aid removal of the paper. If a conventional double sided tape is used to adhere a mesh panel to a window, removal of the panel from the window by peeling will leave the tape bonded to the window. This is particularly so when a printed mesh panel is adhered to a window with the printed side of the mesh facing the glass. The printed side of a printed mesh is generally flatter than the non- printed side, and the apertures in the mesh mean that there is significantly less contact area between the mesh and the tape than between the window and the tape. Consequently it is not possible to re-use a mesh panel and conventional double side tape. If the panel were to be re-used after peeling from a window, it would be necessary to re-apply adhesive tape to the mesh panel. In contrast the panel according to the present invention allows re-use of the panel without the need for re-applying new adhesive, because the first adhesive remains bonded to the mesh during peeling of the panel from a window. The second adhesive does not leave a residue on the window.

Figs 3 and 4 show alternative arrangements of adhesive fasteners on the mesh display panel of the invention. In Fig 3 four small adhesive fasteners 212, which may be short lengths of a double-sided pressure sensitive adhesive tape 204 as described above with reference to Figs 1 and 2, are placed at each corner of the panel 200. This arrangement would be suitable for the small display panel.

In the arrangement of Fig 4 a row of discrete fasteners 214, similar to the fasteners 212 in Fig 3, is arranged at the top of the panel, and a similar row of fasteners 214 is arranged at the bottom the panel. Since this panel is particularly long, additional adhesive fasteners 216, also similar to fasteners 212, are provided at intermediate points along the lateral edges of the display panel 200. Referring to Figs 5 and 6 there is shown a further embodiment of a display system according to the invention. In Fig 5 there is shown a view from outside a car showroom building 330 in which two large windows 320, 322. Each window 320, 322 has a large mesh display panel 300 affixed to the inside of the glass. The mesh display panel 300 is shown in Fig 6, and comprises a cut rectangular panel of mesh 202 of the same fabric as described above with reference to Figs 1 and 2. In this example the image is an advertisement provided on the side of the mesh 202 closest to the window 320, 322. The mesh includes apertures so that the mesh is not opaque, and a person inside the building can see through the mesh to the outside. However from outside the building the image is clearly visible, particularly in daylight or when illuminated from outside.

If the room is illuminated from inside and it is dark outside, a viewer outside can still see the image, because light passing through the apertures in the mesh 202 tends to illuminate the image printed on the external face of the mesh panel 300.

The mesh panel 300 is secured to the glass of the window 320, 322 by adhesive fasteners. In Fig 6 the adhesive fasteners 204 are lengths of double sided pressure sensitive adhesive tape, whose construction is described above with reference to Figs 1 and 2. Two lengths of tape 204 are provided at the top and bottom edges of the panel 300 respectively. In this case, because the panel is large, typically between 1 and 3 m high, additional fasteners 304, of the same construction as the horizontal fasteners 204, are optionally provided at one or more intermediate positions on each of the long vertical sides.

The mesh panel 300 can be secured to the window 320, 322 without the need for particular skill. Typically the mesh panel 300 is supplied in rolled up form with the fasteners 204, 304 already secured to the mesh panel by the first adhesive 102, and with the second adhesive 104 covered by a release paper 206. First the release paper 206 is removed from the top fastener 204, and the top edge of the panel 300 is placed on the window, starting at one side and pressing the panel 300 against the window progressively to the other side. The panel 300 is then unrolled and allowed to hang against the window. If the panel is not vertical, the top fastener 204 can be pulled away from the window and repositioned. Then the release paper 206 is removed from the bottom fastener 204, and the bottom edge of the panel 300 is placed on the window, starting at one side and pressing the panel 300 against the window progressively to the other side, while pulling the bottom edge of the panel down to keep the panel 300 flat against the window. If additional side fasteners 304 are provided, the release paper 206 is removed from the side fasteners 304, and the side edges of the panel are secured against the window. The nature of the low tack second adhesive 104 means that the panel 300 can readily be peeled away from the window to allow repositioning. When the panel 300 is no longer required, it can be peeled away from the window, rolled up and stored for later re-use.

Typically the mesh display panel 200 is supplied to the user in rolled up form. It can be readily cut from a large roll of mesh material, since it requires no special treatment to the edges. All four edges of the panel may be formed by simple cutting. If the panel 200 is too large for the window in which it is to be used, a user may simply trim the panel using a knife or household scissors.

The mesh includes apertures. The porosity is defined as the proportion of the total surface area of the mesh which comprises apertures which are open to air. For example if an area of panel 1 m by 1 m has a total area of apertures of 0.3m², then the porosity of the panel is defined as 30%.

If the porosity of the mesh panel is too low, that is the percentage area of the panel which comprises apertures is too low, then it becomes difficult to see through the panel, and the illumination effect described above for a user viewing a panel from outside an illuminated room is not achieved. If the porosity of the mesh panel is too high, that is the percentage area of the panel which comprises apertures is too high, then it is difficult to print a clear visible image on the fabric mesh.

It has been found that a porosity of at least 10% and not more than 50% is required, to achieve the combination of a clear, visible image and to allow a person inside a building to see through the panel to the outside. Good results are achieved with a porosity of between 20 and 40%, and excellent results are achieved with a mesh of 25% porosity. The apertures in the mesh should be large enough to prevent the apertures filling during the PVC coating process. Ideally at least some of the apertures in the panel should be at least 0.5mm² in area.

When the mesh display panels are designed for use inside a window, they are not subject to extremes of weather, for example high winds and rain, and so it has been found that relatively small areas of adhesive fastener are required to mount a panel permanently to a window. PVC coated meshes are particularly suitable for flat windows, since they are resistant to creasing and tearing, so that a panel can be displayed at a particular season, and taken down and rolled up after use, and reused the following year without damage. Small panels can be provided flat; for example promotional posters can be provided as magazine inserts. Many possible uses for the mesh display panel of the invention are envisaged. Panels can be used as advertising panels on shop windows or other commercial premises, or on windows of vehicles, with the panel applied to the inside of the window and with the image facing outward. Panels can be used to decorate windows in a home or vehicle, either by mounting with the image to the glass in order to convey a message to those outside, for example a seasonal greeting, or to provide a decorative or informative image, for example a sports poster or a periodic table, for those inside the room while still allowing light into the room and allowing occupants of the room to look out, in which case the image is applied on the side of the panel away from the glass.

Preferably the adhesive fasteners are substantially transparent or nearly transparent, so that they do not obscure the printed area when they are applied on the printed side of the mesh, as in outward facing panels. If transparent adhesives are used, then the fastening means remains invisible to those viewing the panel. Moreover transparent adhesives will not interfere with the illumination of an image on the mesh by light passing through the mesh.

The adhesive fasteners may be of any suitable adhesive in addition to those described above. A low tack second adhesive 104 suitable for windows may be bonded to the mesh 202 by any suitable higher strength first adhesive 102, for example one which requires a solvent or heat for activation. Double sided tape or adhesive transfer tape may be used, with or without a backing.

These and other modifications and improvements may be incorporated without departing from the scope of the present invention.

Claims

1. A display system for a window, the system comprising:

wherein the mesh display panel is a woven mesh having apertures and a porosity of at least 10%, and

2. A display system according to claim 1 , wherein the porosity of the woven mesh is in the range 20% to 40%.

3. A display system according to claim 1 or 2, wherein the first adhesive at least partially penetrates into the apertures of the mesh.

4. A display system according to any preceding claim, wherein the second adhesive is adapted to permit removal and re-adhesion of the mesh display panel to a window.

5. A display system according to any preceding claim, wherein the first adhesive has at least one of a tack measured by the loop tack test of DIN EN 1945 greater than that of the second adhesive and a peel strength according to DIN EN 1939 greater than that of the second adhesive.

6. A display system according to claim 5, wherein the first adhesive has a tack measured by the loop tack test of DIN EN 1945 of between 20 and 80 N/12.5 cm, and

the second adhesive has a tack measured by the loop tack test of DIN EN 1945 of between 1 and 10 N/12.5 cm.

7. A display system according to claim 5 or 6, wherein

the first adhesive has a peel strength according to DIN EN 1939 of between 18 and 35 N/25 mm, and

the second adhesive has a peel strength according to DIN EN 1939 of between 7 and 13 N/25 mm.

8. A display system according to any preceding claim, further comprising a window to which the mesh display panel is secured.

9. A display system according to any preceding claim, wherein the panel comprises two adhesive fasteners, which extend substantially along the upper and lower edges respectively.

10. A display system according to any preceding claim, wherein the mesh display panel is cut from a larger roll of mesh material and has untreated cut edges.

11. A method of mounting a display system according to any of claims 1 to 10, the method comprising:

arranging the mesh display panel on an internal surface of a window in a structure enclosing a space, such that the display information is printed on the side adjacent the window and is visible from the external side of the window, and using the adhesive fasteners to secure the mesh display panel to the internal surface of the window.

12. The method of claim 11 , wherein the method may include the step of illuminating the space, such that the display information is visible from outside the window through illumination by light passing through the apertures in the mesh.

13. A method of mounting a display system according to any of claims 1 to 10, the method comprising:

arranging the mesh display panel on an internal surface of a window in a structure enclosing a space, such that the display information is printed on the side facing away from the window and is visible from inside the space, and

using the adhesive fasteners to secure the mesh display panel to the internal surface of the window.