FR2851956A1 - COATED TEXTILE SHEET - Google Patents

Abstract

Sheet (1) of coated textile, characterized in that its surface comprises at least one strip (10, 11) having a lower coefficient of friction than the rest of its surface (3).

Description

COATED TEXTILE SHEET

  Technical field The invention relates to the field of coated textiles, in particular used in tensile structures such as tents, marquees and other modular constructions, but also as cladding or roofing. The invention relates more particularly to specific provisions making it possible to facilitate the positioning of this type of canvas in rigid supports, while retaining good properties of resistance to soiling and to ultraviolet rays. 10 Previous techniques In order to make tents or capitals based on stretched fabrics, a set of metal structures generally forming pillars and a frame between which the fabrics are stretched is used. Among these various methods of attachment, there is known that which consists in equipping the edges of the fabrics with elements called "ropes" comprising a rod extending on the edge of the canvas. This rod is introduced into a groove made in one of the metal beams of the rigid structure.

  In practice, these ropes are made from elements added to the canvas at its edges. More specifically, a textile tape is folded over itself so as to trap the retaining rod. This tape generally has a coated face, typically of PVC, and a textile face, for example based on polyester. This ribbon is welded by its coated side at its edges, trapping the edge of the canvas.

  There are multiple drawbacks to this technique.

  First of all, the fact of using an added element, and generally on the edge 30 of canvas, inevitably causes extra thicknesses at this level. More precisely, at the level of the headline, the overall thickness of the fabric comprises that of the fabric itself, to which is added that of the two layers of tape of the headline. It follows problems of rigidity of the fabric and difficulties of handling.

  The solutions in which a material different from that of the fabric is used to manufacture rope slings are not satisfactory. Indeed, it is obviously understood that from an aesthetic point of view the juxtaposition of two materials harms the perception of the homogeneity of the canvas. In addition, the use of materials having a low coefficient of friction such as, for example, polyester is not satisfactory, since polyester, and more generally textiles, are sources of accumulation of dirt or mold, which degrade very strongly the visual aspect of the canvas at its edges.

  In addition, the sensitivity of polyester to ultraviolet radiation is a factor which causes premature wear of the lines made from polyester. A problem which the invention proposes to solve is that of facilitating the sliding of the fabrics when they are placed in a rigid frame, while retaining excellent properties of resistance to soiling, and more generally excellent visual qualities. . SUMMARY OF THE INVENTION The invention therefore relates to a coated textile sheet which is characterized in that its surface comprises at least one strip having a lower coefficient of friction than the rest of its surface. In other words, the invention consists in producing zones on the coated textile sheets which, when they are folded back on themselves, will present towards the outside a surface which has a low coefficient of friction, in particular with respect to aluminum. In this way, the sliding of this zone folded back on itself and trapping the retaining rod is improved, compared to the solutions in which the ropes are made from the same coated textile.

  In practice, the invention can be used in two different ways.

  Thus, in a first type of application, the strip or strips of lower coefficient of friction may be located near the edges of the sheet, so as to allow the flap of the edge of the sheet to be folded over, and thus forming the headline directly from the sheet.

  In this case, the sheet after manufacture comprises a zone folded back on itself which traps a rod, and the strip of lower coefficient of friction 10 is located on all or part of the external surface of the folded zone which traps the rod, and which is intended to come into contact with the groove receiving the canvas.

  In another type of application, the characteristic sheet may comprise several strips of low coefficient of friction, arranged in parallel, so as to allow the production of independent elements, obtained by cutting this sheet. Ribbons are thus obtained which are then folded back on themselves to trap the rod. Each strip therefore has a strip of lower coefficient of friction which is located over all or part of the outer surface of the area of the strip trapping the rod.

  In other words, it is possible according to the invention to produce sheets which integrate one or more zones which will form, after making, the future ropes. It is also possible to produce independent elements 25 forming slings intended to be attached to existing fabrics.

  In practice, the strip of lower coefficient of friction can be obtained in different ways.

  Thus, it is possible to deposit on the coated textile sheet a layer of additional material, having the width of the desired strip. This additional layer can be made from different materials, and in particular based on polytetrafluoroethylene, but without being limited to this material.

  In other embodiments, the strip of lower coefficient of friction can be produced by the total or partial absence of one of the layers present on the rest of the surface of the sheet.

  The absence of this specific layer can be obtained by the fact that part of the thickness of the sheet is removed, for example by a trimming operation. It is also possible to produce the characteristic strip during the manufacture of the coated textile sheet, avoiding depositing part of the thickness of the coating layer at the point where it is desired to produce the strip more low coefficient of friction.

  It is in particular possible to produce a deposit of lesser thickness, which covers the textile core, but leaves a portion of the woven threads flush, so as to take advantage of the low coefficient of friction of the textile core, and in particular when it is produced polyester.

Brief description of the figures

  The manner of carrying out the invention, as well as the advantages which ensue therefrom, will emerge clearly from the description of the embodiment which follows, with the support of the appended figures in which: coated textile sheet 25 according to the invention.

  FIG. 2 is a cross-sectional view of an alternative embodiment of FIG. 1.

  Figure 3 is a cross-sectional view of the sheet of Figure 2 after making the ropes.

  Figure 4 is a cross-sectional view of a coated textile sheet according to another embodiment of the invention.

  FIG. 5 is a cross-sectional view of a sling forming element produced from a ribbon extracted from the sheet of FIG. 4.

  Figure 6 is a cross-sectional view of a fabric equipped with the rope of Figure 5, placed in a rigid structure.

  Manner of Carrying Out the Invention As already mentioned, the invention relates to coated textiles which are intended to be placed in rigid structures, preferably being kept under transverse tension.

  In general, a coated textile (1) comprises a textile core (2) covered, on each of its faces, with a coating layer (3, 4), based on polymeric material, for example polychloride of vinyl (PVC).

  In practice, the textile core can for example be made of polyester threads.

  In the form illustrated in FIG. 1, the sheet (1) of coated textile comprises two strips (10, 11) produced on the upper face (6) of the upper coating layer (3). These strips (10, 11) are in the example illustrated in FIG. 1 made near the edges (12, 13) of the sheet 1.

  As already mentioned, these strips (10, 11) can be produced according to different operating modes. Thus, in a first embodiment, it is possible to create its strips on an existing coated textile sheet, by trimming allowing a fraction of the thickness of the coating layer (3) to be eliminated. .

  This trimming can be carried out using abrasive wheels which can equip specific machines, or else be placed at the outlet of the coating machines, upstream from the winding.

  The trimming depth is determined as a function of the thickness of the coating layer, and it may for example be sufficient to allow a slight portion of the threads of the textile core to be exposed, in particular at the level where the woven threads are most prominent. In this way, the value of the coefficient of friction of the strip (11) is then influenced by the nature of the threads of the textile core, and this in a direction of decreasing this coefficient.

  As already mentioned, the characteristic strips (10, 11) can also be produced not by removing material, but by a total or partial absence of deposition of the coating layer. This coating layer (3) can itself be produced by the superposition of a plurality of elementary layers, some of which are not deposited at the location of the strips (10, 11).

  It is possible, for example, to deposit the elementary coating layer 15 which makes it possible to almost completely cover the textile reinforcement (3), without however forming any additional thickness. In this case, the threads of the textile core are flush with this elementary layer.

  In another embodiment illustrated in FIG. 2, the strips (20, 21) 20 can be produced by depositing a layer of additional material having a low coefficient of friction. This material can for example be polytetrafluoroethylene (PTFE), or more generally any material having a better coefficient of friction with respect to aluminum than that of PVC. In practice, this additional layer can be deposited during the coating operation, so that it integrates into the coating layer, and therefore is flush with the latter, without forming any additional thickness.

  In the form illustrated in FIGS. 1 and 2, the strips (10, 11, 20, 21) do not extend to the edge of the sheet itself, but delimit the borders having the same structure as the central portion of the sheet.

  However, in other variants not shown, provision may be made, to facilitate manufacture, for the characteristic strips to extend to the edge (12, 13).

  The sheet illustrated in Figure 2 can then be made to make the canvas illustrated in Figure 3. This canvas has rods (24, 25) which are trapped in flaps of the edges of the sheet (1). More specifically, the edge edges (22, 23) are folded down under the underside (4), where they are welded to trap the rods (24, 25). This welding is carried out by the contact 10 of the portions of the lower face (4), on either side of the strips (20, 21).

  In this way, the characteristic bands (20, 21) surround the area trapping the rod (24, 25). It is this outer face trapping the rod which comes into contact with the walls of the grooves in which the edges of the fabric slide when it is put in place.

  Of course, the dimensions of the characteristic strips (20, 21) can be adapted as a function of the diameter of the rod to be trapped. It is also possible to split each of the characteristic bands into two or more bands, so as to arrange them only in the contact zones between the groove and the fabric, and in particular at the level of the internal faces of the bulged zones receiving the rods.

  The embodiments described above correspond to the production of 25 ropes from the edges of the fabric folded back on themselves. However, the invention also makes it possible to produce ropes independent of the fabric, and as illustrated in FIG. 4.

  Thus, a coated textile sheet (30) illustrated in FIG. 4 can undergo a treatment allowing it to define several characteristic bands (31,33,35,37).

  These strips can be produced as already mentioned either by adding a layer of specific material, or by removing part of the coating layer or else by depositing only part of the upper coating layer.

  These different bands (31, 33, 35, 37) are separated by zones (32, 34, 36, 38) in which the coated textile has its nominal composition and thickness.

  Thereafter, the coated textile (30) is cut into several parallel ribbons (50) each comprising a characteristic strip (31, 33, 35, 37), and approximately half of the zone of nominal thickness (32, 34, 36) separating two consecutive characteristic bands.

  Each of these ribbons (50) can then be folded back on itself to trap a rod (54) so that the outer face of this ribbon is formed by the characteristic strip (33), of lower coefficient of friction. The two nominal thickness portions (32, 34) are then welded at the level of a zone (52) allowing the portions (32, 34) to be released for their repositioning at the edge of a fabric.

  This implementation illustrated in Figure 6 in which the fabric (51) is equipped with ropes (50) formed of the ribbon trapping the rod (54). As already mentioned, the dimensions and the arrangement of the characteristic strip or strips 25 on the headline can be optimized. Indeed, it may be useful to have the characteristic bands only in the areas of the rope which will come into contact with the surface of the groove (61), produced in the profile (60). These contact zones (55, 56) are essentially located on the internal face of the rod (54).

  It appears from the above that the fabrics equipped with rope are either independent or integrated, in accordance with the invention, have multiple advantages, and in particular: * the reduction in the coefficient of friction in the areas where the rope comes into contact with the sliding groove; * when it is constituted by a flap of the edge of the canvas itself, the headline then obviously has the same mechanical and aesthetic properties as the rest of the canvas, which is advantageous in terms of resistance to soiling and the like external factors, as well as aesthetically; * the rope has the same reaction to fire classification as the rest of the canvas, which is a major advantage compared to the reported rope 10 generally made of PVC and polyester; * the extra thickness at the headline is reduced compared to existing solutions, which facilitates the operations of placing the fabric in rigid structures.

Claims (7)

  1 / Sheet (1) of coated textile, characterized in that its surface comprises at least one strip (10, 11) having a lower coefficient of friction than the rest of its surface (3).   2 / sheet according to claim 1, characterized in that the strip or strips (10, 11) of lower coefficient of friction is located near a selvedge (12, 13) of the sheet.   3 / sheet according to claim 1, characterized in that it comprises several strips (31, 33, 35, 37) of lower coefficient of friction arranged in parallel.   4 / sheet according to claim 1, characterized in that the strip (21) of lower coefficient of friction is formed by an additional layer deposited on its surface.   5 / sheet according to claim 1, characterized in that the strip (10, 11) of lower coefficient of friction is formed by the total or partial absence of a layer present on the rest of the surface.   6 / sheet according to claim 2, characterized in that it comprises at the level of at least one selvedge (12, 13) a region folded back on itself to trap a rod (24, 25), the strip (20 , 21) having a lower coefficient of friction being located over all or part of the outer surface of the folded area trapping the rod (24, 25).   7 / element produced by a ribbon obtained from a textile sheet according to claim 3, folded back on itself to trap a rod (24), the strip (33) of lower coefficient of friction being located on all or part of the external surface of the zone of the ribbon trapping the rod (24).