Textile anti-skid device for pneumatic tires and method for producing same

Abstract

The present invention relates to an anti-skid device (1) for a vehicle wheel and an associated method of manufacturing the same, the anti-skid device (1) comprising a band (2) having a closed circumferential development line (100) configured to be mounted on a tire (99) of the wheel to surround and cover at least the tread of the tire (99), and a fastening system (9) associated with the band (2) for securing the band to the wheel, the band (2) being made from a warp-knitted fabric (3) having a main knit direction (101) arranged substantially parallel to the circumferential development line (100).

Description

[Technical Field]

[0001] The present invention relates to an anti-skid device for vehicle wheels and to an associated manufacturing process. [Background technology]

[0002] Anti-skid devices for vehicle wheels are known which comprise a textile band attached to the tire of the wheel.

[0003] Such anti-skid devices are typically used, for example as an alternative to chains, to promote the grip of the wheels on the rolling surface in certain road conditions, such as in snow and / or ice, but also in mud, gravel, sand, etc.

[0004] Patent document 1, in the same name as the applicant of the present application, discloses an anti-skid device for vehicle wheels, comprising a band made of a textile material having a plurality of ribs arranged in relief, substantially perpendicular to the rolling direction of the tire, when the device is attached to the tire. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] European Patent No. 1888353 (B2) [Patent Document 2] Japanese Patent No. 5167137 (B2) (related to Patent Document 1) Summary of the Invention [Problem to be solved by the invention]

[0006] "Substantially perpendicular" to geometric elements (e.g., straight lines, lines, planes, surfaces, etc.) means that these elements (or their tangents) form angles within the range of 90° + / - 15°, preferably 90° + / - 10°, including the extreme angles.

[0007] "Substantially parallel" to a geometric element means that the element (or its tangent) forms an angle in the range 0° + / - 15°, preferably 0° + / - 10°, including the extreme angles.

[0008] The terms "radial" and "axial" are used with reference to directions (substantially) perpendicular and (substantially) parallel, respectively, to the central axis of the closed circumferential development line of the band, which, in use, substantially coincides with the axis of rotation of the tire on which the device is mounted.

[0009] The applicant has found it advantageous to manufacture anti-skid devices by a warp knitting process (e.g., where a plurality of individual yarns are fed to the knitting zone with yarns that are substantially parallel to one another and the paths of the individual yarns in the knitted fabric are, on average, substantially parallel to the main knitting direction) compared to a weft knitting process (e.g., where the knitted fabric is made from a single yarn and the yarn develops in the fabric substantially perpendicular to the direction of growth of the fabric).

[0010] "Main knit direction" means the direction of growth of a warp-knitted fabric during warp knitting (i.e., the direction in which the warp yarns of the fabric simultaneously grow and unfold). Typically, the fabric is wound parallel to the main knit direction as it is produced. The main knit direction is curved (e.g., circumferential) when the fabric is formed into a non-planar shape (e.g., the tubular shape of an anti-skid device).

[0011] The applicant has also recognized that the manufacturing process for anti-skid devices could be improved in several respects.

[0012] For example, the applicant has observed that in the anti-skid device described in Patent Document 1, the raised ribs (or more generally, knitted warp threads) created by the fabric itself following the warp knitting process are arranged according to (i.e., (substantially) parallel to) the main knitting direction. This entails that in order to achieve a device in which, when the device is mounted on a tire, the raised ribs (or more generally, knitted warp threads) are arranged substantially perpendicular to the rolling direction of the tire, it is necessary to cut the roll of fabric in the direction of its height, i.e., perpendicular to the main knitting direction, so as to obtain the maximum dimension of the fiber bands.

[0013] In addition to this, the applicant has also found that further process and / or product constraints must be respected, such as the need to manufacture fiber bands of different lengths (with different circumferential developments) to cover the full range of tire sizes in circulation, the need to limit fabric scrap, and / or the need to limit the maximum height of the rolls depending on the maximum dimensions manageable by the various machines used to realize the bands, such as, for example, fabric heat stabilization ovens and fabric roll cutting machines.

[0014] Therefore, in order to optimize the process conditions according to all the aforementioned constraints, the production of multiple dough rolls with different heights between them is employed.

[0015] Furthermore, if the band has a length that exceeds the maximum height allowed for the roll, it is necessary to join two (or more) pieces of fabric obtained from different rolls (each roll having a height equal to the length of the band piece).

[0016] However, initially using fabric rolls of different heights complicates warehouse management, for example in terms of storage and / or handling of the rolls, and also leads to a lower utilization yield of the fabric knitting machine and stationary ovens for the same working time and / or consumption in the case of rolls of lower height (for example the entire available front part of the machine is not used).

[0017] Furthermore, joining pieces of different lengths to create a single fabric band also requires the presence of at least one additional stitch along the band relative to the seam intended to close the band itself (to achieve circumferential deployment of the anti-skid device), resulting in a larger (more extensive) process.

[0018] The applicant has therefore addressed the problem of producing an anti-skid device for vehicle wheels in an industrially efficient and / or simple and / or economical process, while maintaining the desired anti-skid qualities imparted on the tire and / or the structural robustness of the anti-skid device itself.

[0019] According to the Applicant, the aforementioned problem is solved by an anti-skid device and related manufacturing process (manufacturing method) according to the appended claims and / or having one or more of the following characteristics: [Means for solving the problem]

[0020] According to one aspect, the present invention relates to an anti-skid device for a wheel of a vehicle, said anti-skid device comprising: a band having a closed circumferential development line, the band being shaped to be attached to a tire for surrounding and covering at least the tread of the tire on a wheel; a fastening system associated with the band and structured to secure the band to the wheel; Equipped with The band is made from a warp knitted fabric having a main knitting direction, which is arranged (substantially) parallel to the circumferential development line of the band.

[0021] According to another aspect, the present invention relates to a process for manufacturing an anti-skid device for a wheel of a vehicle, said process comprising: warp knitting a warp knit fabric having a main knitting direction; cutting bands from the warp knitted fabric, the bands having a primary deployment direction substantially parallel to the primary knitting direction; Joining opposite ends of the band relative to a main direction of deployment of the band to achieve a closed circumferential deployment line of the band, the band being shaped to be mounted on a tire of a wheel and to surround and cover at least one tread of the tire; associating a fastening system with the band, the fastening system being structured to secure the band to the wheel; Includes.

[0022] The applicant has surprisingly found that by arranging the main knitting direction of the fabric substantially parallel to the rolling direction of the tire (as opposed to the orthogonal arrangement as in the prior art), the anti-skid device imparts the desired skid resistance properties to the tire, while at the same time making it possible to modify the manufacturing process so that, upon cutting, the fabric bands can be cut from the fabric roll in such a way that the maximum dimension of the band is arranged (substantially) parallel to the main knitting direction, i.e. (substantially) orthogonal to the height of the roll, thereby reducing or even eliminating the above-mentioned problems.

[0023] In fact, in this way, the height of the fabric roll is no longer a limitation for the band fabric roll, which can therefore extend in a single piece parallel to the knitting direction regardless of the desired longitudinal length, thus avoiding further stops in sewing separate pieces.

[0024] Furthermore, by adjusting the width of the bands according to the height (and not the length) of the rolls, it is possible to limit the number of different types of fabric rolls (divided by height) that can be provided in the warehouse, even achieving the possibility of producing and storing only rolls with the same height, simplifying warehouse management and at the same time improving the utilization yield of the machines used (e.g. looms and / or stationary ovens) and / or the cutting yield (e.g. limiting scrap).

[0025] For example, in practice, as tire sizes vary, tread widths vary to a lesser extent with each change in circumference, and therefore fewer band width classes (i.e., groups) are generally sufficient to cover all different tire sizes. Therefore, roll heights must be designed to accommodate a smaller range of band width variability. Additionally, the smaller band width dimension relative to longitudinal length allows for a greater number of width combinations to be realized for a given fabric roll height, allowing for optimized placement of different bands within the roll's surface extension and limiting fabric scrap.

[0026] The present invention in either or both of the above aspects may have one or more of the preferred features listed below.

[0027] Preferably, the warp knitted fabric comprises a plurality of first fiber yarns and a plurality of second fiber yarns knitted together.

[0028] Preferably, each first and / or second fiber thread is a continuous thread of synthetic material, more preferably polypropylene (PP) or polyethylene terephthalate (PET). In this way, the service life of the device is improved compared to, for example, the use of natural fibers, which may deteriorate over time.

[0029] Preferably, each of the first and / or second fiber yarns is a multifilament fiber yarn, more preferably containing (at least) 100 filaments, even more preferably (at least) 120 filaments (and up to 120 filaments), so that they are provided with the desired robustness.

[0030] Preferably, each first fiber yarn has a fineness (ie, length to weight ratio) of 700 denier or more, more preferably 800 denier or more, and / or 1300 denier or less, more preferably 1200 denier or less.

[0031] Preferably, each second fiber yarn has a fineness of 1200 denier or more, more preferably 1300 denier or more, and / or 1800 denier or less, more preferably 1700 denier or less.

[0032] Preferably, each first fiber yarn has a tenacity of 2 g / denier or more, more preferably 3 g / denier or more, and / or 6 g / denier or less, more preferably 5 g / denier or less.

[0033] Preferably, each second fiber yarn has a tenacity of 3 g / denier or more, more preferably 4 g / denier or more, and / or 7 g / denier or less, more preferably 6 g / denier or less.

[0034] The applicant has found that the aforementioned characteristics mentioned for the first and second fiber yarns make it possible to obtain a fiber material having desired properties, for example in terms of lightness, robustness, abrasion resistance, etc.

[0035] In a particularly preferred embodiment, the warp knitted fabric (and / or the further fabrics and / or the single fabric described further below) is made using a loom with (at least) two tie bars, more preferably a Raschel type linear loom, each tie bar equipped with (at least) lead hooks with a fineness equal to 6 needles per inch, in a "tricot" type weave, more preferably with anti-running properties, and preferably a "Raschel" type weave, preferably with anti-running properties. The realization of this type of fabric has proven to be particularly advantageous in terms of process efficiency and / or the resulting fabric properties, for example for anti-skid purposes.

[0036] Preferably, the warp knitted fabric is heat stabilized. Preferably, the process includes heat stabilizing the warp knitted fabric (e.g., via a stenter), more preferably before cutting bands from the fabric. In this way, the dimensional stability of the fabric is improved, making it easier to cut to size.

[0037] Preferably, said warp knitted fabric comprises a plurality of raised ribs arranged (substantially) parallel to the main knitting direction.

[0038] Preferably, the plurality of ribs are made by warp knitting, more preferably by (directly) knitting one or more second textile yarns onto one or more first textile yarns.

[0039] Typically, the ribs are present only on a first surface of the warp knitted fabric. Preferably, the second surface, opposite the first surface of the warp knitted fabric, is substantially flat.

[0040] Preferably, the first surface is positioned radially inward (i.e., facing the tire when the device is mounted). In other words, in contrast to the prior art, the rib preferably does not contact the rolling surface in use. Indeed, the applicant has surprisingly found that a substantially flat second surface effectively performs the anti-skid function.

[0041] Preferably, the band has a thickness (preferably in the non-ribbed areas) of at least 0.2 mm, more preferably at least 0.25 mm, and / or at most 0.4 mm, even more preferably at most 0.35 mm, so that the band is light and at the same time sufficiently robust.

[0042] Preferably, the fastening system is arranged on (at least) one (more preferably both) axial edges of the band, and preferably comprises (at least) an elastic element with circumferential extension (more preferably a pair of elastic elements arranged on axially opposite parts of the band).

[0043] Preferably, the fastening system comprises (at least) one flexible strip (more preferably each a pair of flexible strips) with a respective closed circumferential deployment line. Preferably, the (each) flexible strip is connected to the band at a (respective) axial edge of the band. Preferably, the elastic element is fixed to the flexible strip at its free edge. This facilitates fastening of the device to the wheel, for example by contracting the flexible strip relative to the tire under the action of an elastic body.

[0044] Preferably, the(r) flexible strip is(are) made from a further warp knitted fabric.

[0045] Preferably, the further (knitted) fabric has a visual appearance different from that of the fabric, in this way, even if there is a single seamless fabric between the band and the strip and no circumferential seam (as described below), the user can easily recognize the separation line between the band and the(respective) strip and verify the correct positioning of the band and / or strip relative to the tread and / or sidewall of the tire thanks to their different visual appearance, i.e., distinguishable from one another, thereby facilitating correct positioning of the anti-skid device on the tire.

[0046] In one embodiment, the further fabric has a color different from the color of the fabric, for example the further fabric comprises one or more fiber threads having a color different from the respective color of each fiber thread of the fabric, In this way the aforementioned difference in visual appearance between the band and the strip is achieved in a simple and effective way.

[0047] In one embodiment, alternatively to or in combination with the immediately preceding embodiment, the additional fabric has a different structure from that of the aforementioned fabric, for example, the additional fabric has a wider mesh net structure than the aforementioned fabric, e.g., a large mesh net structure with through-openings, and / or comprises one or more fiber yarns (e.g., with the same type of weave, i.e., the same knitting process) that have a different, more preferably higher, fineness than the corresponding fiber yarns of the aforementioned fabric. In this way, the aforementioned difference in visual appearance between the band and the strip is realized in a simple and effective manner. In addition, the large mesh and / or lightweight mesh net structure makes the additional fabric of the strip lighter and / or more flexible than the fabric of the band, thus promoting curling of the strip under the action of an elastic body for the benefit of resistance.

[0048] Preferably, the further fabric has a further main knitting direction (substantially) parallel to the main knitting direction. Preferably, the further warp-knitted fabric of the (each) flexible strip is integral with the warp-knitted fabric of the band (e.g., there is no circumferential seam between the band and the strip). Preferably, the process comprises warp-knitting the further warp-knitted fabric integrally with the warp-knitted fabric, more preferably weaving a single warp-knitted fabric comprising alternating portions made of warp-knitted fabric and portions made of further warp-knitted fabric along a direction perpendicular to the main knitting direction. Preferably, cutting the band also comprises cutting from the single fabric two strips of further fabric located on opposite portions of the band, for example by making separate cuts substantially parallel to the main knitting direction along the two portions of the further fabric. The arrangement of the main knitting direction along the circumferential development of the band also makes it possible to realize, in the same structurally coherent and continuous warp-knitted fabric, sections with differentiated treatments and / or sections with fiber yarns of different colors and / or finenesses, used for different functions (e.g., for the functions of the band and strip(s) respectively), without interrupting the knitting process (avoiding the need to fasten additional fabrics to the knitted fabric, e.g., by sewing). In this way, the process is versatile while remaining simple and / or fast and / or cheap.

[0049] Preferably, the mesh net structure of the further fabric has rectangular, more preferably square, through-openings, which is thus easy to achieve, particularly by warp knitting.

[0050] Preferably, one or more (more preferably each) of the through openings has a major deployed dimension (e.g., the larger side of a rectangle, or the side of a square) of 2 mm or more, more preferably 4 mm or more, and / or 7 mm or less, more preferably 5 mm or less, which balances the robustness of the mesh netting structure with vacuum strength. [Brief explanation of the drawings]

[0051] [Figure 1]1 shows a schematic representation of an anti-skid device according to the invention mounted on a tire of a wheel. [Figure 2] 2 shows a schematic diagram of the details of the apparatus of FIG. 1; [Figure 3] 3 shows a photograph of a detail of a warp knitted fabric that can be used in an anti-skid device according to the invention. DETAILED DESCRIPTION OF THE INVENTION

[0052] The features and advantages of the present invention will become more apparent from the following detailed description of some embodiments thereof, given by way of example and not of limitation, with reference to the accompanying drawings, in which:

[0053] An anti-skid device for wheels of a vehicle (not shown) is designated in the figure by the reference numeral 1.

[0054] The anti-skid device 1 includes a band 2 having a closed circumferential development line 100 that is shaped to be attached to a tire 99 on a wheel so as to surround and cover at least the tread (the portion that comes into contact with the road surface) of the tire. Illustratively, the band 2 entirely covers only the tread of the tire.

[0055] Illustratively, in use, the band's circumferential development line 100 lies substantially along the circumferential development of the tire and is therefore substantially parallel to the tire's rolling direction 200 (represented by the double arrow).

[0056] The band 2 is illustratively made from a warp knit fabric 3 having a main knitting direction 101 arranged parallel to a circumferential development line 100 (i.e. parallel to the rolling direction of the tire 99).

[0057] The present invention comprises a band made entirely of warp knit fabric; A band comprising a warp-knitted fabric and one or more inserts joined to the fabric (e.g., having extensions of the warp-knitted fabric that are not necessarily continuous along the entire circumferential line of deployment). The company intends to achieve both of these goals.

[0058] Figure 3 shows, by way of example, a photograph of a warp-knitted fabric adapted to make the band 2 of an anti-skid device according to the invention. By way of example, the warp-knitted fabric 3 shown in Figure 3 is made with a "tricot" type anti-run weave.

[0059] In operation, this type of fabric can be advantageously made by using a "Raschel" type linear loom with a loom equipped with two tie bars, each tie bar equipped with a lead hook having a fineness equal to 6 needles per inch.

[0060] Other examples of warp knit fabrics are the "Milanese" type weave and the "Raschel" type weave.

[0061] Illustratively, the warp knitted fabric 3 comprises a plurality of first textile yarns 4 and a plurality of second textile yarns 5 knitted together. In the photograph of Figure 3, the first textile yarns 4 are illustratively shown in light colors, and the second textile yarns 5 are illustratively shown in dark colors. Illustratively, the main knitting direction 101, on average, substantially corresponds to the direction in which the second textile yarns 5 unfold.

[0062] Illustratively, each of the first and second fiber yarns is a continuous yarn of synthetic material, for example polypropylene (PP), illustratively a multifilament fiber yarn with 120 filaments.

[0063] Illustratively, the first fiber yarns are different from the second fiber yarns. Specifically, each first fiber yarn 4 illustratively has a fineness equal to about 1000 denier and a tenacity equal to about 4 g / denier. Illustratively, each second fiber yarn 5 illustratively has a fineness equal to about 1500 denier and a tenacity equal to about 5 g / denier.

[0064] Illustratively, in Figure 2, the warp-knitted fabric 3 comprises a plurality of ribs 6 in relief arranged parallel to the main knitting direction 101. Illustratively, the plurality of ribs 6 are made directly by the warp-knitted fabric 3 following the warp-knitting manufacturing process; more particularly, each rib 6 is illustratively realized by a second fiber yarn 5 interwoven with a plurality of first fiber yarns 4. Illustratively, the ribs 6 are present only on a first side 7 of the warp-knitted fabric 3 (typically the side corresponding to the "back" side of the fabric), which is shown schematically and partially in Figure 2.

[0065] Illustratively, band 2 comprises a second surface 8 (shown in the photograph of FIG. 3) opposite (opposite) first surface 7. Illustratively, second surface 8 is substantially flat. Illustratively, the corrugations present on second surface 8, which are in fact realized by the first and / or second fiber yarns and which intertwine with one another to achieve a warp-knitted fabric, all have ridges of substantially the same height and substantially uniformly spaced apart, ensuring that second surface 8 is substantially planar overall (unlike first surface 7, where ribs rise above the rest of the fabric below).

[0066] Illustratively, the first surface 7 is positioned radially inward, i.e., facing the tire 99 when the device is mounted. In other words, the rib 6 is not in contact with the rolling surface but rather with the tread of the tire.

[0067] Illustratively, the band 2 has a thickness (e.g., in the area without ribs) equal to about 0.3 mm. Illustratively, the ribs 6 have a height, compared to the remainder of the first face 7, equal to about 0.8 mm.

[0068] The anti-skid device 1 further comprises a fastening system 9 associated with the band 2 and structured to secure the band to the wheel.

[0069] Illustratively, the fastening system 9 is disposed at both axial edges 20 of the band 2. More particularly, the fastening system 9 illustratively comprises a pair of flexible strips 10 (only one visible in FIG. 1 ), each having a respective closed circumferential deployment line. Illustratively, each flexible strip 10 is coupled to the band 2 at a respective axial edge 20 of the band 2.

[0070] Illustratively, the fastening system 9 comprises a pair of elastic elements (not shown) arranged on axially opposing portions of the band 2, each elastic element being secured to a respective flexible strip 10 at a free edge 21 of the flexible strip (e.g., sewn to the flexible strip or inserted into a pocket made along the edge of the flexible strip).

[0071] Illustratively, each flexible strip 10 is made from a further warp knitted fabric having a large mesh netting structure (not shown) with individual main knitting directions parallel to the main knitting direction 101 and through openings.

[0072] Illustratively, the further warp knit fabric of each flexible strip is integral with the warp knit fabric of band 2 .

[0073] Illustratively, the large mesh netting structure has substantially square openings of about 4 mm.

[0074] In one embodiment, the further fabric may have the same type of weave as the warp knitted fabric 3 .

[0075] In one embodiment, the further fabric may be made from fibre yarns of a different colour and / or fineness than the fibre yarns of fabric 3.

[0076] Illustratively, the manufacturing process (manufacturing method) of the anti-skid device 1 includes first warp knitting (eg, by means of the aforementioned Raschel loom) a warp knitted fabric 3 having a main knitting direction 101 .

[0077] Illustratively, the process further comprises warp knitting a further warp-knitted fabric integrally with the warp-knitted fabric (i.e., in the knitting process). More particularly, in a preferred embodiment, the process comprises weaving a single warp-knitted fabric comprising alternating (e.g., interleaved) portions made from said warp-knitted fabric 3 and portions made from said further warp-knitted fabric along a direction perpendicular to the main knitting direction 101.

[0078] Illustratively, there is then provided a thermal stabilization of the warp knitted fabric or single fabric (for example through a stenter).

[0079] Thus, exemplarily, it is provided that the bands 2 are cut from the warp-knitted fabric with their main unfolding direction (not shown) substantially parallel to the main knitting direction 101. In other words, one or more cuts (typically two cuts for each anti-skid device) are made substantially along the main knitting direction.

[0080] The band 2 is cut in such a way that the width of the shape to be cut (e.g., a rectangle) is, exemplarily, the full width of the section made from warp-knitted fabric 3 (making up band 2) and a portion (e.g., about half) of the width of each section of further warp-knitted fabric (making up the two transverse flexible strips) individually arranged on the side of the section made from warp-knitted fabric. The length of the shape (arranged parallel to the main knitting direction) is exemplarily established depending on the size of the tire for which the anti-skid device is intended.

[0081] Thus, it is exemplarily provided that opposing ends of the band are joined (e.g., by stitching) relative to the main direction of deployment of the band to achieve a closed circumferential deployment line of the band, and at the same time, it is exemplarily provided that opposing ends of a portion made from a further warp knitted fabric are also joined (e.g., by stitching) to achieve the flexible strip 10.

[0082] Finally, to complete the fastening system 9, it is provided by way of example that each elastic element is coupled to a separate flexible strip. [Explanation of symbols]

[0083] 1 Anti-skid device 2 bands 3 Warp knit fabric 4. A plurality of first fiber yarns 5. A plurality of second fiber yarns 6. Relief ribs 7 First side of warp knit fabric 8 Second side of warp knit fabric 9 Fastening System 10 flexible strip 99 Tires 100 Circumferential development line 101 Main knitting direction

Claims

1. An anti-skid device (1) for a wheel of a vehicle, comprising: a band (2) having a closed circumferential development line (100), the band (2) being configured to be attached to a tire (99) of the wheel so as to surround and cover at least the tread of the tire; a fastening system (9) associated with said band (2) and structured to secure said band (2) to said wheel; Equipped with The band is made from a warp knitted fabric (3) having a main knitting direction (101), The anti-skid device, wherein the main weaving direction (101) is arranged substantially parallel to the circumferential development line (100) of the band (2).

2. The warp knitted fabric (3) comprises a plurality of first fiber yarns (4) and a plurality of second fiber yarns (5) knitted together; each of the first textile thread (4) and / or the second textile thread (5) is a continuous thread made of a synthetic material, said continuous thread preferably being made of polypropylene or polyethylene terephthalate; 2. An anti-skid device according to claim 1, wherein each of the first textile thread (4) and / or the second textile thread (5) is a multifilament textile thread comprising at least 100 filaments.

3. Each of the first fiber yarns (4) has a fineness of 700 denier or more and 1300 denier or less and a tenacity of 2 g / denier or more and 6 g / denier or less, Each of the second fiber yarns (5) has a fineness of 1200 denier or more and 1800 denier or less and a tenacity of 3 g / denier or more and 7 g / denier or less, 3. An anti-skid device according to claim 2, wherein the warp-knitted fabric (3) is thermally stabilized.

4. The warp-knitted fabric (3) comprises a plurality of raised ribs (6) arranged substantially parallel to the main knitting direction (101); The plurality of ribs (6) are formed by the warp-knitted fabric (3), the ribs (6) are present only on a first surface (7) of the warp-knitted fabric (3), and a second surface (8) of the warp-knitted fabric (3) opposite to the first surface (7) is substantially flat; 4. An anti-skid device according to any one of claims 1 to 3, wherein the first surface (7) is arranged radially inward and the band (2) has a thickness of 0.2 mm to 0.4 mm.

5. 5. An anti-skid device according to any one of claims 1 to 4, wherein the fastening system (9) is arranged on at least one axial edge (20) of the band (2), the fastening system (9) comprising at least one elastic element with a circumferential development.

6. The fastening system (9) comprises at least one flexible strip (10) having a respective closed circumferential development line, the flexible strip (10) being connected to the band (2) at an axial edge (20) of the band (2); 6. An anti-skid device according to claim 5, wherein the elastic element is fixed to the flexible strip (10) at a free edge (21) of the flexible strip (10).

7. the flexible strip (10) is made from a further warp-knitted fabric, the further warp-knitted fabric of the flexible strip (10) being integral with the warp-knitted fabric (3) of the band (2); 7. The anti-skid device according to claim 6, wherein the further warp-knitted fabric has a large-mesh net structure with through-openings and a further main knitting direction substantially parallel to the main knitting direction (101), the large-mesh net structure having rectangular openings, one or more of the through-openings having a main deployed dimension of between 2 mm and 7 mm.

8. The warp knitted fabric (3) is made with a "tricot" type weave, preferably with anti-running properties, on a Raschel type linear loom having a loom with at least two binding bars; 8. An anti-skid device according to any one of claims 1 to 7, wherein each tie bar comprises a lead hook having a fineness equal to at least 6 needles per inch.

9. A method for manufacturing an anti-skid device (1) for a wheel of a vehicle, comprising the steps of: A step of warp knitting a warp knitted fabric (3) having a main knitting direction (101); cutting bands (2) from said warp knitted fabric (3) having a main deployment direction substantially parallel to said main knitting direction (101); a joining step of joining both ends of the band (2) that are opposite each other with respect to the main direction of deployment of the band (2) to achieve a closed circumferential deployment line (100) of the band (2), the band (2) being configured to be mounted on a tire (99) of the wheel to surround and cover at least the tread of the tire (99); associating said band (2) with a fastening system (9) structured to fix said band (2) to said wheel; The method comprising:

10. The method includes a step of thermally stabilizing the warp knitted fabric (3) before cutting the bands (2) from the warp knitted fabric, and 10. The method according to claim 9, wherein the method comprises warp knitting a further warp knit fabric which is integral with the warp knit fabric (3).

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