WO2013066166A1

WO2013066166A1 - Covering material for architectural structures

Info

Publication number: WO2013066166A1
Application number: PCT/NL2012/050752
Authority: WO
Inventors: Dirk Johannes Van Schellebeek
Original assignee: Ubbink B.V.
Priority date: 2011-10-31
Filing date: 2012-10-30
Publication date: 2013-05-10
Also published as: NL2007679C2

Abstract

Covering material for architectural structures, particularly for roof structures, comprising a layer of plastically deformable metal mesh having mesh-shaped openings that is accommodated between a first silicone-based sheet and a second silicone-based sheet, wherein the first sheet and the second sheet are glued together by means of a cured filling silicone-based adhesive.

Description

Covering material for architectural structures

BACKGROUND OF THE INVENTION

The invention relates to a covering material for architectural structures.

A known covering material for architectural structures is composed of a layer of bituminous material in which a layer of plastically deformable metal mesh is accommodated. The known covering material has excellent sealing properties, however the bituminous material stiffens at lower temperatures as a result of which the covering material is more difficult to process then.

It is an object of the invention to provide a new generation of covering material for architectural structures that can be processed and used in a wide range of temperatures.

SUMMARY OF THE INVENTION

According to one aspect the invention provides a covering material for architectural structures, particularly for roof structures, comprising a layer of plastically deformable metal mesh having mesh-shaped openings that is accommodated between a first silicone- based sheet and a second silicone-based sheet, wherein the first sheet and the second sheet are glued together by means of a cured filling silicone-based adhesive. The first sheet and the second sheet and the filling adhesive are silicone-based. This material retains its elasticity and temperature resistance in a wide range of temperatures, as a result of which the covering material can be processed in low and high temperatures, meaning in all seasons.

In one embodiment the first sheet and the second sheet are made of a silicone rubber.

In one embodiment the first sheet and the second sheet are made of a water vapour permeable silicone rubber.

In one embodiment the main component of the first sheet and the second sheet is cured or cross- linked polysiloxanes.

In one embodiment the main component of the first sheet and the second sheet is peroxide cross- linked polysiloxanes.

In one embodiment the first sheet and the second sheet have a percentage by weight of polysiloxanes of at least 50%, preferably at least 60%.

In one embodiment the first sheet and/or the second sheet have a thickness of 0.3-0.5 mm.

In one embodiment the first sheet and/or the second sheet have a Shore A Durometer index of 30-50, preferably a Shore A Durometer index of 40 with a plus or minus 5 margin.

In one embodiment the first sheet and/or the second sheet have an elasticity with a modulus 100% (M100) that is smaller than 1.0 Megapascal, preferably smaller than 0.75 Megapascal.

In one embodiment the first sheet and/or the second sheet have a tensile strength of less than 10 Megapascal .

In one embodiment the cured adhesive forms a silicone rubber.

In one embodiment the cured adhesive forms a water vapour permeable silicone rubber. In one embodiment the main component of the cured adhesive is cured or cross-linked polysiloxanes .

In one embodiment the adhesive cures on the basis of alcohol, meaning that it is alkoxy-curing . This type of adhesive adheres particularly well to said first sheet and the second sheet of which the main component is of a peroxide cross-linked polysiloxanes.

In one embodiment the adhesive is neutrally curing, meaning that it is oxym-curing.

In one embodiment the adhesive cures on the basis of acetic acid.

In one embodiment the adhesive has a percentage by weight of polysiloxanes of at least 50%, preferably at least 60%.

In one embodiment the adhesive extends through the mesh-shaped openings and is adhered to the first sheet and the second sheet.

In one embodiment the cured adhesive fully fills up the space between the first sheet and the second sheet that has not been taken up by the metal mesh, as a result of which the adhesion is uniform and detachment of the sheet and the adhesive is counteracted also when extreme bending forces are exerted on the covering material.

In one embodiment the metal mesh is manufactured out of a metal plate that has been incised at the location of the openings to be formed and has subsequently been stretched for transforming the incisions into the openings bounded by metal strips, while tilting the metal strips out of and with respect to the main plane of the metal plate, wherein on at least one of the main planes of the metal mesh the tips of the tilted metal strips present there have been flattened in order to form surfaces that are parallel to the main plane of the metal mesh, wherein the metal mesh is subjected to a tempering treatment to enhance the plastic deformability of the metal mesh. Such metal mesh shows a dead-fold behaviour as a result of which the covering material can easily be brought into its final shape in the work.

In one embodiment the parts of the first sheet and the second sheet that extend in between the flattened surfaces are at least partially receded in the openings .

According to a second aspect the invention provides a method for manufacturing a covering material for architectural structures, particularly for roof structures, by means of a roller assembly, wherein the covering material comprises a layer of plastically deformable metal mesh having mesh-shaped openings that has been accommodated between a first silicone-based sheet and a second silicone-based sheet, wherein the first sheet and the second sheet are glued together by means of a cured filling silicone-based adhesive, wherein the roller assembly comprises a first pressure roller and a second pressure roller that extend parallel to each other, wherein the method comprises supplying in a converging manner and passing the first sheet and the second sheet having the metal mesh in between them, in between the first pressure roller and the second pressure roller, wherein the adhesive is applied as a curing viscous mass between the first sheet and the second sheet and is confined between the first sheet and the second sheet when passing the first and the second sheet having the metal mesh in between them, synchronously in between the first pressure roller and the second pressure roller.

The first pressure roller and second pressure roller bring the first sheet and second sheet with the metal mesh and the curing adhesive in between them simultaneously together, as a result of which the adhesive is able to initiate adhesion on the first sheet and second sheet. In that way the covering material already acquires its final shape, after which after passing the rollers the adhesive is able to cure further . In one embodiment the viscous mass is excessively present in front of the first pressure roller and the second pressure roller, so that air inclusions are counteracted and the adhesive is able to completely fill the space between the first sheet and the second sheet around the metal mesh in order to achieve a homogeneous product.

In one embodiment the first pressure roller and the second pressure roller have an elastically compressible casing with a smooth circumferential surface, wherein the circumferential surfaces are at a mutual distance from each other that is smaller than the final height of the covering material, wherein the circumferential surfaces are locally elastically pressed in at the locations where the first sheet and the second sheet are situated against the metal mesh and the circumferential surfaces press the first sheet and the second sheet situated beside it toward the mesh-shaped openings while elastically deforming the first sheet and the second sheet.

In one embodiment thereof the first pressure roller and the second pressure roller press the first sheet and the second sheet toward the mesh-shaped openings up to an externally measured mutual distance that is at least 10% of the final height of the covering material. In that way the adhesive is used economically and the processing speed is optimised with regard to the final hardening time of the adhesive.

In one embodiment at least one of the first pressure roller and the second pressure roller is provided with two circle-cylindrical outer circumferential surfaces having a circle-cylindrical inner circumferential surface of a smaller diameter in between, wherein the outer circumferential surfaces run against the circumferential surface of the other pressure roller and the inner circumferential surface is at a fixed distance from the circumferential surface of the other roller. The staggered position of this roller bounds a slit between the first pressure roller and the second pressure roller through which slit the first sheet and the second sheet having the metal mesh in between them are able to pass, wherein an excess of the curing mass can remain present in front of the rollers. Said excess can continuously be replenished.

The aspects and measures described in this description and the claims of the application and/or shown in the drawings of this application may where possible also be used individually. Said individual aspects may be the subject of divisional patent applications relating thereto. This particularly applies to the measures and aspects that are described per se in the sub claims.

SHORT DESCRIPTION OF THE DRAWINGS

The invention will be elucidated on the basis of a number of exemplary embodiments shown in the attached drawings, in which:

Figure 1A shows an example of an architectural structure in which a strip of covering material according to an embodiment of the invention is incorporated;

figures IB and 1C shows a detail and a cross- section of the strip of covering material according to figure 1A;

figures 2A-2E shows the steps of a first method for obtaining a part of the strip of covering material according to figures 1A-1C;

figure 3 shows a second method for obtaining the strip of covering material according to figures 1A- 1C by means of a first roller assembly according to the invention; and

figure 4 shows the second method for obtaining the strip of covering material according to figures 1A- 1C by means of a second roller assembly according to the invention.

DETAILED DESCRIPTION OF THE DRAWINGS

Figure 1A shows an architectural structure, in this example a roof structure 9 that is provided with a tiled roof cover 90 and a dormer window 91 that is upright from the tiled roof cover 90 and has a straight lower beam 92 at the lower side of the window frame. Below the lower beam 92 a strip of covering material 1 according to an embodiment of the invention is shown. The strip of covering material 1 sits partially over the upper part of the abutting row of tiles and follows the undulating form there. The strip of covering material 1 having a constant width Q of in this example 20 cm and a height H3 of approximately 2.8 mm forms a water-retaining transition between the dormer window 91 and the tiled roof cover 90.

Figures IB and 1C show the individual strip of covering material 1 that is straight elongated in direction L as well as a cross-section thereof. The composition and internal structure of the strip of covering material 1 is the same over the entire surface. The strip of covering material 1 comprises an aluminium stretch metal mesh 14 that is confined between a first silicone-based sheet 22 and a second silicone-based sheet 23. The first sheet 22 and the second sheet 23 are glued together by means of a filling silicone-based adhesive 26.

The first sheet 22 and the second sheet may be transparent or be provided with a colour of their own. The first sheet 22, as the sight side of the covering material 1, can be provided with a particular colour that suits the application of the covering material 1, for instance deep red like tiles or grey like a counter flashing. The second sheet 23 may have a neutral colour .

The first sheet 22 and the second sheet 23 have the same chemical and mechanical properties. The first sheet 22 and second sheet 23 are made of a silicone rubber. The main component of the first sheet

22 and the second sheet 23 is peroxide cross-linked polysiloxanes. The first sheet 22 and the second sheet

23 have a percentage by weight of polysiloxanes of at least 60%. The first sheet 22 and the second sheet 23 are vapour permeable. The first sheet 22 and the second sheet 23 have a thickness of 0.3-0.5 mm. The first sheet 22 and the second sheet 23 have a Shore A Durometer index of 40 having a plus or minus 5 margin. The first sheet 22 and the second sheet 23 have an elasticity with a modulus 100% (M100) of less than 0.75 Megapascal .

After curing the filling adhesive 26 is a silicone rubber. The adhesive 26 can be transparent or be provided with a colorant. The main component of the material is cured or cross-linked polysiloxanes. The adhesive has a percentage by weight of polysiloxanes of at least 60%. The adhesive 26 adheres well to the first sheet 22 and the second sheet 23 as they are both silicone-based. The transitions of the cured adhesive to the first sheet 22 and the second sheet 23 can be visually discerned. In the silicone material the covering material 1 has a multi-layered structure formed by the first sheet 22, the adhesive 26 and the second sheet 23. There has been no mixing between the polymer chains of the first sheet 22 and the second sheet 23 on the one hand and the polymerising monomers of the adhesive 26 on the other hand. The adhesive 26 cures on the basis of alcohol or it is alkoxy-curing . This adheres particularly well to the peroxide cured first sheet 22 and second sheet 23. Alternatively the adhesive 26 is neutrally curing or oxym-curing. Alternatively the adhesive cures on the basis of acetic acid .

Due to their silicone basis the first sheet 22, the second sheet 23 and the adhesive 26 have special properties, namely resistance against temperatures over 80 degrees Celsius, excellent flexible properties both at high temperatures and at low temperatures below -10 degrees Celsius and a good resistance against moisture. Silicones are inorganic and thus provide no breeding ground for biological growth or biological film formation. This renders the covering material 1 applicable and pliable worldwide in all seasons.

The strip of covering material 1 is obtained by successively carrying out two methods. The first method is elucidated on the basis of figures 2A-E and a second method is elucidated on the basis of figure 3.

The first method regards the manufacturing of the aluminium stretch metal mesh 14. Taken as starting point is an elongated aluminium plate 10 as shown in figure 2A. Said figure shows the situation after the first step of the first method, in which the aluminium plate 10 is provided with several rows of short incisions 11 in the transverse direction, wherein the one row is staggered with respect to the next row. Figure 2B shows the situation in which the aluminium plate 10 has been pulled apart in opposite longitudinal directions A, wherein the incisions 11 are deformed into diamond-shaped openings 13 by approximation. In that way a stretch metal mesh 14 is created that is built up from integrally formed meandering strips 15 of aluminium material that in between them define the diamond-shaped openings 13.

As schematically shown in figure 2C in cross- section, the stretch metal mesh 14 has been deformed as a result of pulling it apart in the longitudinal direction, particularly between the diamond-shaped openings 13 where a tilting of the strips 15 has taken place. As a result of said tilting the stretch metal mesh 14 comprises sharp first tips 16 at the upper side of the aluminium plate 10 and sharp second tips 17 at the lower side of the aluminium plate 10. The height HI between the first tips 16 and the second tips 17 is approximately 2.3 mm.

In figure 2C a stamping device 5 is shown, comprising a first fixed stamp 51 and a second stamp 52 that is movable in direction B. With its second tips 17 the stretch metal mesh 12 is placed on the first fixed stamp 51. In figure 2D the situation is shown in which the second stamp 52 is moved in direction B up to height H2. The stretch metal mesh 14 is then slightly flattened between the first stamp 51 and the second stamp 52. The flattening can also be carried out between rollers.

Figure 2E shows the stretch metal mesh 12 after flattening, wherein the sharp first tips 16 and the sharp second tips 17 according to figure 4C have been flattened into flat first tip areas 18 and flat second tip areas 19, respectively, that extend parallel to the straight main plane of the stretch metal mesh 14. In that case the diamond-shaped openings 13 can be slightly reduced in size, but more importantly the height H2 has been reduced with respect to the height HI in figure 2C into a considerably smaller size, in this example approximately 1.8 mm. Subsequently the stretch metal mesh 14 is tempered in a heat treatment of approximately 300 degrees Celsius or higher, which treatment is known per se, in order to provide the aluminium material with high plastic properties.

The second method regards the composition of the covering material 1 by means of a first roller assembly 6 as schematically shown in figure 3 or a second roller assembly as schematically shown in figure 4.

The first roller assembly 6 as shown in figure 3 comprises a first pressure roller 30 about a first driving shaft 31 and a second pressure roller 33 about a second driving shaft 34. The driving shafts 31, 34 extend parallel to each other and are driven in an opposing manner by means of a drive that is not further shown.

The first pressure roller 30 is made of a stiff rubber and has a smooth, straight circle- cylindrical circumferential surface 32. The second pressure roller 33 is also made of a stiff rubber and has two similar smooth, straight circle-cylindrical outer circumferential surfaces 35 and a smooth straight circle-cylindrical inner circumferential surface 36 of a smaller diameter. The outer circumferential surfaces 36 of the second pressure roller 33 have the same diameter as the circumferential surface 32 of the first pressure roller 30. Said circumferential surfaces 36, 32 are firmly abutting, under local bias of the rubber. The inner circumferential surface 35 of the second roller 33 is thus kept at a fixed distance from the circumferential surface 32 of the first pressure roller 30. In this example said distance is 2.5 mm.

Underneath it, the first roller assembly 6 comprises a first guide roller 40 about a third driving shaft 41 and a second guide roller 44 about a fourth driving shaft 43. The driving shafts 41, 43 extend parallel to each other and are driven in an opposing manner by means of a drive that is not further shown. The guide rollers 40, 44 are made of a stiff rubber and have a smooth, straight circle-cylindrical circumferential surface 42, 45 of the same diameter. Said circumferential surfaces 42, 45 are at a distance of a few millimetres from each other. The driving shafts 31, 34, 41, 43 are bearing mounted in a frame that is not further shown.

When carrying out the second method by means of the first roller assembly 6 the first sheet 22 and the second sheet 23 with the stretch mesh 14 in between them are synchronously supplied from their own first supply roll 63, second supply roll 62 and third supply roll 20, respectively, in direction C between the pressure rollers 30, 33. The sheets 62 and the stretch mesh 14 converge and end up in the space that is on the one side bounded by the inner circumferential surface 35 and the transitional edges to the outer circumferential surfaces 36 of the second roller 33, and on the other side by the circumferential surface 32 of the first roller 30. The fixed height of said space is adjusted to the height H2 of the stretch mesh 14 and the height H3 of the final covering material 1 such that the first sheet 22 and the third sheet 23 are pressed against the flat first tip areas 18 and flat second tip areas 19, respectively, while locally elastically pressing in the material of the pressure rollers 30, 33, and that the first sheet 22 and second sheet 23 in between them are smoothly pressed inwards. This pressing in of the first sheet 22 and the second sheet 23 regards at least 10% of the final height H3 of the covering material 1.

Upstream of the pressure rollers 30, 33 a viscous mass of adhesive 26 that is starting to cure is constantly supplied. The viscous mass forms a first creamy accumulation 64 between the first sheet 22 and the stretch mesh 14 and a second creamy accumulation 65 between the stretch mesh 14 and the second sheet 23. The accumulations 64, 65 extend over the full width of the inner circumferential surface 35 of the second pressure roller 30 and are in fluid connection with each other via the diamond-shaped openings 13 in the stretch mesh 14. The adhesive 26 in that case fully fills up the space between the sheets 22, 23 that has not been taken up by the stretch mesh 14. After passing by the pressure rollers the adhesive 26 has obtained a sufficiently large initial adhesion to the sheets 22, 23 for the sheets to remain attached in the condition as acquired between the pressure rollers 30, 33. The accumulations 64, 65 are constantly refreshed by new supply of viscous mass to the accumulations 64, 65 and discharge of the adhesive 26 that has ended up between the sheets 22, 23 by passing by the pressure rollers 30, 33. Locally pressing in the first sheet 22 and the second sheet 23 between first tip areas 18 and flat second tip areas 19, respectively, ensures that the adhesive 26 is incorporated economically and fully filling between the first sheet 22 and second sheet 23. This optimises the curing time and thus the processing time of the production process.

The web of covering material 1 that has left the pressure rollers 30, 33 has acquired the final shape of the covering material 1, but the adhesive 26 still needs to cure fully. The curing may take place by cutting the web into elongated strips of a regular commercial length and storing these strips, or by winding the web onto a roll 46. For the purpose of storage the web is passed through the guide rollers 40, 44 in order to apply a thin protective foil 66 from its own supply roll 61 onto one side. Said protective foil 66 prevents that windings situated on each other or the strips that have been cut to commercial lengths and stacked onto each other, adhere to one another.

The second roller assembly 106 as shown in figure 4 differs only partially from the first roller assembly 6 described above. The corresponding parts have the same reference numbers. Only the different parts will be discussed below.

The second roller assembly 106 comprises a third pressure roller 133 about a second driving shaft 34. The third pressure roller 133 is made of a stiff rubber and comprises smooth, straight circle- cylindrical circumferential surface 135 of the same diameter as the first pressure roller 30. The first driving shaft 31 and the second driving shaft 34 are at a fixed mutual distance from each other, such that the circumferential surfaces 32, 135 in unloaded condition are at a mutual distance from each other of in this example 2.5 mm as well.

The second roller assembly 106 furthermore comprises a first transfer roller 168 about a fifth driving shaft 169 and a second transfer roller 172 about a sixth driving shaft 171. The transfer rollers 168, 173 have a smooth, straight circle-cylindrical circumferential surface along which the first sheet 22 and second sheet 23, respectively, run in the path between the supply rolls 63, 62 and the pressure rollers 30, 133. Above the transfer rollers 168, 172 the adhesion dispensers 170, 173 are positioned by which means viscous adhesive 23 can be dispensed in direction D over the full width of the transfer rollers 168, 172. The transfer rollers 178, 172 and the adhesive dispensers 170, 173 are made of a material on which the silicon-based adhesive will not adhere, such as polyethylene (PE) , polypropylene (PP) _r polyoxymethylene (POM) and polytetrafluoroethylene (PTFE) .

When carrying out the second method by means of the second roller assembly 106 the viscous adhesive dispensers 170, 173 constantly supply a viscous mass of the adhesive 26 that has started to cure onto the transfer rollers 168, 172. The transfer rollers 168, 172 apply the adhesive 26 firmly as covering layers 166, 167 onto the sides of the first sheet 22 and second sheet 23 that face each other. Subsequently the first sheet 22 and the second sheet 23 are firmly pressed against the stretch mesh 14 by the pressure rollers 30, 133, again while locally elastically pressing in the material of the pressure rollers 30, 33 in order to push the first sheet 22 and the second sheet 23 between the flat first tip areas 18 and flat second tip areas 19 smoothly inwards. Said pressing in of the first sheet 22 and second sheet 23 again regards at least 10% of the final height H3 of the covering material 1. Straight in front of the pressure rollers 30, 33 the adhesive 26 can be present in a limited third creamy accumulation 164 between the first sheet 22 and the stretch mesh 14 and a limited second creamy accumulation 165 between the stretch mesh 14 and the second sheet 23, which just suffices to fully fill up the space between the sheets 22, 23 that has not been taken up by the stretch mesh 14.

The above description is included to illustrate the operation of preferred embodiments of the invention and not to limit the scope of the invention. Starting from the above explanation many variations that fall within the spirit and scope of the present invention will be evident to an expert.

Claims

1. Covering material for architectural structures, particularly for roof structures, comprising a layer of plastically deformable metal mesh having mesh-shaped openings that is accommodated between a first silicone-based sheet and a second silicone-based sheet, wherein the first sheet and the second sheet are glued together by means of a cured filling silicone-based adhesive.

2. Covering material according to claim 1, wherein the first sheet and the second sheet are made of a silicone rubber.

3. Covering material according to claim 1 or 2, wherein the first sheet and the second sheet are made of a water vapour permeable silicone rubber.

4. Covering material according to any one of the preceding claims, wherein the main component of the first sheet and the second sheet is cured or cross- linked polysiloxanes .

5. Covering material according to any one of the preceding claims, wherein the main component of the first sheet and the second sheet is peroxide cross- linked polysiloxanes.

6. Covering material according to any one of the preceding claims, wherein the first sheet and the second sheet have a percentage by weight of polysiloxanes of at least 50%, preferably at least 60%.

7. Covering material according to any one of the preceding claims, wherein the first sheet and/or the second sheet have a thickness of 0.3-0.5 mm.

8. Covering material according to any one of the preceding claims, wherein the first sheet and/or the second sheet have a Shore A Durometer index of 30- 50, preferably a Shore A Durometer index of 40 with a plus or minus 5 margin.

9. Covering material according to any one of the preceding claims, wherein the first sheet and/or the second sheet have an elasticity with a modulus 100% (M100) that is smaller than 1.0 Megapascal, preferably smaller than 0.75 Megapascal.

10. Covering material according to any one of the preceding claims, wherein the first sheet and/or the second sheet have a tensile strength of less than 10 Megapascal.

11. Covering material according to any one of the preceding claims, wherein the cured adhesive forms a silicone rubber.

12. Covering material according to any one of the preceding claims, wherein the cured adhesive forms a water vapour permeable silicone rubber.

13. Covering material according to any one of the preceding claims, wherein the main component of the cured adhesive is cured or cross-linked polysiloxanes .

14. Covering material according to any one of the preceding claims, wherein the adhesive cures on the basis of alcohol, meaning that it is alkoxy-curing .

15. Covering material according to any one of the preceding claims, wherein the adhesive is neutrally curing, meaning that it is oxym-curing.

16. Covering material according to any one of the preceding claims, wherein the adhesive cures on the basis of acetic acid.

17. Covering material according to any one of the preceding claims, wherein the adhesive has a percentage by weight of polysiloxanes of at least 50%, preferably at least 60%.

18. Covering material according to any one of the preceding claims, wherein the adhesive extends through the mesh-shaped openings and is adhered to the first sheet and the second sheet.

19. Covering material according to any one of the preceding claims, wherein the cured adhesive fully fills up the space between the first sheet and the second sheet that has not been taken up by the metal mesh .

20. Covering material according to any one of the preceding claims, wherein the metal mesh is manufactured out of a metal plate that has been incised at the location of the openings to be formed and has subsequently been stretched for transforming the incisions into the openings bounded by metal strips, while tilting the metal strips out of and with respect to the main plane of the metal plate, wherein on at least one of the main planes of the metal mesh the tips of the tilted metal strips present there have been flattened in order to form surfaces that are parallel to the main plane of the metal mesh, wherein the metal mesh is subjected to a tempering treatment to enhance the plastic deformability of the metal mesh.

21. Covering material according to claim 20, wherein the parts of the first sheet and the second sheet that extend in between the flattened surfaces are at least partially receded in the openings.

22. Covering material provided with one or more of the characterising measures described in the attached description and/or shown in the attached drawings .

23. Method for manufacturing a covering material for architectural structures, particularly for roof structures, by means of a roller assembly, wherein the covering material comprises a layer of plastically deformable metal mesh having mesh-shaped openings that has been accommodated between a first silicone-based sheet and a second silicone-based sheet, wherein the first sheet and the second sheet are glued together by means of a cured filling silicone-based adhesive, wherein the roller assembly comprises a first pressure roller and a second pressure roller that extend parallel to each other, wherein the method comprises supplying in a converging manner and passing the first sheet and the second sheet having the metal mesh in between them, in between the first pressure roller and the second pressure roller, wherein the adhesive is applied as a curing viscous mass between the first sheet and the second sheet and is confined between the first sheet and the second sheet when passing the first and the second sheet having the metal mesh in between them, synchronously in between the first pressure roller and the second pressure roller.

24. Method according to claim 23, wherein the viscous mass is excessively present in front of the first pressure roller and the second pressure roller.

25. Method according to claim 23 or 24, wherein the first pressure roller and the second pressure roller have an elastically compressible casing with a smooth circumferential surface, wherein the circumferential surfaces are at a mutual distance from each other that is smaller than the final height of the covering material, wherein the circumferential surfaces are locally elastically pressed in at the locations where the first sheet and the second sheet are situated against the metal mesh and the circumferential surfaces press the first sheet and the second sheet situated beside it toward the mesh-shaped openings while elastically deforming the first sheet and the second sheet .

26. Method according to claim 25, wherein the first pressure roller and the second pressure roller press the first sheet and the second sheet toward the mesh-shaped openings up to an externally measured mutual distance that is at least 10% of the final height of the covering material.

27. Method according to any one of the claims 23-26, wherein at least one of the first pressure roller and the second pressure roller is provided with two circle-cylindrical outer circumferential surfaces having a circle-cylindrical inner circumferential surface of a smaller diameter in between, wherein the outer circumferential surfaces run against the circumferential surface of the other pressure roller and the inner circumferential surface is at a fixed distance from the circumferential surface of the other roller .

28. Method provided with one or more of the characterising measures described in the attached description and/or shown in the attached drawings.