FABRIC TAPE

Description

[0001] The invention relates to a fabric belt, in particular a forming fabric, for a machine for producing and / or processing a fibrous web, comprising an upper fabric layer with upper longitudinal threads and upper transverse threads interwoven with these, and a lower fabric layer with lower longitudinal threads and lower transverse threads interwoven with these, wherein the two fabric layers are arranged one above the other in such a way that, when the fabric belt is used as intended, the upper fabric layer faces the fibrous web and the lower fabric layer faces away from the fibrous web, wherein the upper longitudinal threads are unevenly spaced from one another.

[0002] Such fabric belts have been used very successfully as so-called SSB (sheet support binding) forming fabrics in the paper and board manufacturing industry since the mid-1990s. The multi-layer structure of the fabric belt offers the advantage that the upper longitudinal and transverse threads can be thinner than the lower longitudinal and transverse threads. This allows them to provide the finest and smoothest possible surface for the fibrous web, while the thicker lower longitudinal and transverse threads absorb the tensile forces acting on the fabric in the longitudinal and transverse directions and can withstand the wear to which the fabric belt is exposed when it is guided over fixed dewatering elements in the machine, such as suction boxes.

[0003] If the fabric belt has a weave pattern that includes an identical number of upper and lower longitudinal threads, an upper longitudinal thread is usually arranged above each lower longitudinal thread. This is also referred to as "on-stacking." The upper and lower longitudinal threads are essentially all spaced identically from each other. Such a weave pattern offers the advantage of minimal drainage resistance from the longitudinal threads and thus leads to particularly good formation of the fibrous web. However, if the drainage rate becomes too high, there is a risk that too many fillers will be washed out.

[0004] In a well-known alternative weaving pattern, the upper longitudinal threads are arranged exactly above the gap between two adjacent lower longitudinal threads. This is referred to as "off-stacking." Although in this case, all upper and lower longitudinal threads are essentially equally spaced from each other, the water escaping from the fibrous web can no longer be drained as directly through the fabric belt. This reduces the drainage rate and results in fewer fillers being washed out. However, the reduced drainage rate can lead to an undesirable reduction in production speed.

[0005] Furthermore, fabric belts, in particular in the form of SSB forming fabrics, in which the number of upper longitudinal threads differs from the number of lower longitudinal threads, in particular is greater, have been known for some time. As a result, the upper longitudinal and transverse threads can be made even finer than the lower longitudinal and transverse threads in order to offer the fibrous web an even smoother contact surface. A fabric belt of this generic type is shown, for example, in Fig. 1d of the document WO 2013 / 160391 A1. The longitudinal threads are arranged next to one another in different groups, namely first groups, each formed from a lower longitudinal thread and an upper longitudinal thread arranged above it, and second groups, each formed from a lower longitudinal thread and two upper longitudinal threads arranged above it.To minimize undesirable hydraulic marking properties, which are primarily caused by the lower longitudinal threads, the lower longitudinal threads are spaced essentially identically from each other. However, this results in the upper longitudinal threads being spaced differently from each other, which is not optimal in terms of the topographical marking properties of the fabric tape. However, this allows the advantages of "on-stacking" and "off-stacking" to be combined.

[0006] The object of the present invention is to further improve the marking properties of the generic fabric tape just described. In particular, it appears desirable to further develop a generic fabric tape so that it retains its low hydraulic marking properties as much as possible, as well as combining the advantages of "on-stacking" and "off-stacking" while simultaneously optimizing its topographical marking properties.

[0007] The object is achieved by a fabric tape having the features according to claim 1. Further advantageous features are mentioned in the dependent claims.

[0008] According to the invention, the generic fabric tape described at the outset is characterized in that the upper longitudinal threads are arranged such that their average spacings have the following sequence, which is continuously repeated in the transverse direction of the fabric tape: wide spacing, wide spacing, narrow spacing, wherein the difference between an average wide spacing and an average narrow spacing corresponds to at least 50% of a diameter of an upper longitudinal thread.

[0009] It has surprisingly been found that such a sequence of spacing between the upper longitudinal threads has a very beneficial effect on the markings in the fibrous web. Although the upper longitudinal threads are not all spaced identically from one another, topographical markings in the fibrous web are thus difficult or impossible to detect. Rather, the different spacing of the upper longitudinal threads appears to contribute advantageously to masking hydraulic diagonal markings caused by the weave pattern of the lower fabric layer. In any case, the fabric tape according to the invention can be used to produce fibrous webs of very good quality in terms of uniform formation.

[0010] Particularly with SSB forming fabrics, it can happen that the upper longitudinal threads do not run completely straight in the longitudinal direction of the fabric belt, but rather exhibit a kind of undulating movement to the left and right, i.e., towards the side edges of the fabric belt. This undulating movement is caused by the binding threads, which, if they are transverse threads, sometimes push the upper longitudinal threads to the right and sometimes to the left, depending on which side of the upper longitudinal thread they dip downwards. For this reason, the distance between two upper longitudinal threads - viewed in the longitudinal direction of the fabric - is not always necessarily constant. To account for this circumstance, the present application refers to the "average distance" between two adjacent longitudinal threads.In other words, if the spacing varies in the longitudinal direction of the fabric tape, particularly if a wavy line is present, a straight longitudinal thread should be assumed, arranged on the center line of the wavy line. This "average" spacing of the upper longitudinal threads can be adjusted during the manufacturing process of the fabric tape. Such fabric tapes are usually woven flat, heat-set, and then spliced ​​on a seaming machine to form an endless tape. In flat weaving, the longitudinal threads correspond to the warp threads, and the transverse threads to the weft threads. The spacing of the warp threads can be adjusted in the so-called reed.

[0011] Furthermore, the average spacing values ​​of the two wide spacings may not be exactly identical to each other. The average value of the first wide spacing in the above-described sequence of: wide spacing, wide spacing, narrow spacing may be slightly smaller or slightly larger than the average value of the second wide spacing. If this is the case, then at least for the wide spacing with the larger average spacing value, the difference between this average wide spacing and the average narrow spacing should correspond to at least 50% of the diameter of an upper longitudinal thread.For the other wide spacing having the smaller average spacing value, however, it should preferably apply that the difference between this average wide spacing and the average narrow spacing corresponds to at least 20% of a diameter of an upper longitudinal thread.

[0012] As is common with most of these woven tapes, all upper longitudinal threads preferably have the same cross-sectional shape and the same diameter. If, in exceptional cases, this cross-sectional shape is not circular but, for example, flattened, the diameter should be the diameter of a circular cross-sectional shape with the same cross-sectional area. The same applies analogously to the lower longitudinal threads.

[0013] During the heat-setting process, which every flat-woven fabric belt must undergo for a forming fabric application to enable the subsequent splice seam, the warp threads, originally deployed as stretched, straight monofilaments in the longitudinal direction, undergo a transformation, in particular plastic deformation, at elevated temperatures and under tensile stress at the intersection points with the weft threads, also originally deployed as stretched, straight monofilaments in the transverse direction. Since tensile stress is exerted specifically on the warp threads during the heat-setting process, they flatten slightly under the influence of temperature and tensile stress. If, for the purposes of this invention, circular cross-sectional shapes of the warp threads are referred to, this flattening and the associated deviation from the circular shape are disregarded. Instead, a circular cross-sectional shape with an equivalent cross-sectional area is assumed.

[0014] To provide the smoothest possible surface for the fibrous web, the upper longitudinal threads preferably have a smaller diameter than the lower longitudinal threads. In particular, the diameter of the upper longitudinal threads can be only between 40% and 60% of the diameter of the lower longitudinal threads. For example, the diameter of the upper longitudinal threads can be between 0.07 mm and 0.30 mm and / or the diameter of the lower longitudinal threads can be between 0.15 mm and 0.50 mm.

[0015] It may be preferred that the wide spacing be between 100% and 300% of the diameter of an upper longitudinal thread and / or that the narrow spacing be between 30% and 125% of the diameter of an upper longitudinal thread. Tests have shown that this has produced very satisfactory results with regard to the formation of the fibrous web. Even if the spacing between two immediately adjacent upper longitudinal threads in the longitudinal direction of the fabric belt is not constant, but rather the upper longitudinal thread follows a wavy line, for example, the first and / or second spacing preferably always remain within the aforementioned range(s).

[0016] A first embodiment of the fabric tape according to the invention provides that the ratio of upper warp threads to lower warp threads in the fabric tape is 1:1, with the lower warp threads preferably being spaced identically from one another. For example, a group of longitudinal threads consisting of a lower longitudinal thread and an upper longitudinal thread arranged directly above it (on-stacked) can be adjacent to a group of longitudinal threads consisting of a lower longitudinal thread and an upper longitudinal thread, which, however, is not arranged exactly above the lower longitudinal thread (off-stacked).

[0017] A second, alternative embodiment of the fabric tape according to the invention provides that the weave pattern of the fabric tape is repeated in repeats, wherein the upper longitudinal threads and the lower longitudinal threads are arranged in each repeat in several groups, with a first group and a second group and at least one further group from the first and / or second group, wherein each first group is formed from an upper longitudinal thread and a lower longitudinal thread arranged below it, and each second group is formed from an upper longitudinal thread and two lower longitudinal threads arranged below it. Preferably, the fabric tape consists exclusively of such first and second groups with regard to its longitudinal threads.Furthermore, it may be preferred that the upper and lower longitudinal threads in each group are not offset from one another or are only slightly offset from one another when viewed in a vertical projection onto the fabric layers, so that a maximum free space of half the diameter of an upper longitudinal thread is formed between them. The quotient of the number of upper longitudinal threads to the number of lower longitudinal threads is preferably not an integer. Within a repeat, there may be one or more repeat units, i.e. a fixed sequence, of first and second groups of longitudinal threads, wherein the group repeat sequence should preferably be a maximum of 15.

[0018] In addition to the uneven spacing of the upper longitudinal threads according to the invention, uneven spacing of the lower longitudinal threads can also be advantageous. In particular, it can be provided that a first distance between two immediately adjacent lower longitudinal threads is greater than a second distance between two immediately adjacent lower longitudinal threads, wherein the difference between the first distance and the second distance is between 25% and 200% of a diameter of an upper longitudinal thread. The inventors have surprisingly discovered that, contrary to popular opinion, it can be advantageous with regard to the hydraulic marking properties of the fabric tape if the lower longitudinal threads are not always arranged at the same distance relative to one another.They explain this observation by stating that a significant portion of the hydraulic marking property is attributable to regular hydraulic diagonal markings, which are significantly reduced by lower longitudinal threads, which can be arranged at irregular intervals. The uneven spacing of the lower longitudinal threads works synergistically with the inventive uneven spacing of the upper longitudinal threads to mask or prevent regular hydraulic diagonal markings, which are primarily caused by the weave pattern of the lower fabric layer.

[0019] It can be provided that the two lower longitudinal threads of a second group have the second distance from each other, while the two lower longitudinal threads of a first group and a second group immediately adjacent to this first group and / or the two lower longitudinal threads of two immediately adjacent first groups have the first distance.

[0020] A third, alternative embodiment of the woven tape according to the invention provides that the weave pattern of the woven tape is repeated in repeats, wherein the upper longitudinal threads and the lower longitudinal threads are arranged in several groups in each repeat, with a first group and a second group, wherein the first group is formed from an upper longitudinal thread and a lower longitudinal thread arranged below it, and the second group is formed from two upper longitudinal threads and a lower longitudinal thread arranged below it. Preferably, the woven tape consists exclusively of such first and second groups with regard to its longitudinal threads. More preferably, the repeat comprises as many first as second groups.Furthermore, it may be preferred that the upper and lower longitudinal threads in each group are not offset from one another or are only slightly offset from one another when viewed in a vertical projection onto the fabric layers, so that a maximum free space of half the diameter of an upper longitudinal thread is formed between them. The quotient of the number of upper longitudinal threads to the number of lower longitudinal threads is preferably not an integer. Within a repeat, there may be one or more repeat units, i.e. a fixed sequence, of first and second groups of longitudinal threads, wherein the group repeat sequence should preferably be a maximum of 15.

[0021] Furthermore, it has proven advantageous if the difference between the average wide spacing between two directly adjacent upper longitudinal threads and the average narrow spacing between two directly adjacent upper longitudinal threads is a maximum of 200%, preferably a maximum of 150%, of the diameter of an upper longitudinal thread. Excessively large differences otherwise pose the risk of visually perceptible topographical markings in the fibrous web.

[0022] As already described above with regard to known SSB forming fabrics, it is preferably also provided in the fabric belt according to the invention that the first and second fabric layers are connected to one another by binding threads arranged in pairs. These binding threads can extend in the transverse direction of the fabric belt. Furthermore, the two binding threads of the respective binding thread pair can be interwoven with upper and lower longitudinal threads in an interchangeable manner and can cross each other when changing from interweaving with upper longitudinal threads to interweaving with lower longitudinal threads and vice versa, forming preferably at least two crossing points.

[0023] Preferably, the upper fabric layer is formed by interweaving the upper longitudinal threads with the upper transverse threads and the binding threads, while the lower fabric layer is formed by interweaving the lower longitudinal threads with the lower transverse threads. This means that the binding threads are an integral part of the upper fabric layer and contribute nothing to the lower fabric layer, but merely connect it to the upper fabric layer.

[0024] According to a preferred embodiment of the invention, the weave pattern of the upper fabric layer forms a plain weave. This is particularly uniform with the smallest possible repeat unit. Unlike other weaves, it is particularly free of weave burrs extending in a diagonal direction. Thus, a plain weave of the upper fabric layer does not reinforce the hydraulic diagonal marking, which is responsible for the lower fabric layer.

[0025] Further advantageous features of the invention are explained using exemplary embodiments with reference to the following drawings. They show: Fig. 1 a schematic representation of a first embodiment of a fabric tape according to the invention, Fig. 2 a schematic representation of a second embodiment of a fabric tape according to the invention, and Fig. 3 a schematic representation of a third embodiment of a fabric tape according to the invention.

[0026] Figure 1shows a schematic view of a first embodiment of a fabric tape according to the invention. Only the upper longitudinal threads 01-03 and the lower longitudinal threads U1-U3, which together form a repeating unit WE, are visible, but not the upper transverse threads interwoven with the upper longitudinal threads 01-03 to form an upper fabric layer, the lower transverse threads interwoven with the lower longitudinal threads U1-U3 to form a lower fabric layer, and the binding threads connecting the upper fabric layer to the lower fabric layer. The binding threads are preferably an integral part of the weave pattern, in particular a plain weave, of the upper fabric layer, whereas they do not contribute to the weave pattern of the lower fabric layer.

[0027] The fabric band is composed of repeating repeats. With regard to the upper longitudinal threads 01-03 and the lower longitudinal threads U1-U3, a repeat can in principle consist of exactly one single repeat unit WE. However, a repeat often comprises several such repeat units WE. It should be noted that a repeat is defined not only by the longitudinal threads, but also by the cross threads and binding threads. If the upper fabric layer is a plain weave, which is preferred, a repeat must have an even number of upper longitudinal threads. Since the repeat unit WE in the first embodiment according to Figure 1 has three upper longitudinal threads 01-03, the repeat must comprise an integer multiple of the repeat units WE, i.e. at least two repeat units WE.

[0028] In the present first embodiment, a repeating unit WE is formed from three groups of longitudinal threads, namely three first groupsI,each comprising only one upper longitudinal thread O1-O3 and one lower longitudinal thread U1-U3. Between the first upper longitudinal thread O1 and the second upper longitudinal thread O2 there is a first, relatively wide distance a1. The same relatively wide distance a1 is also located between the second upper longitudinal thread O2 and the adjacent third upper longitudinal thread O3. In contrast, the distance a2 between the third upper longitudinal thread O3 and the adjacent upper longitudinal thread O1 of a next repeating unit is significantly narrower. This results in a sequence of the distances of the upper longitudinal threads O1-O3 in the transverse direction of the woven tape of wide distance a1, wide distance a1, narrow distance a2, with this sequence repeating continuously in the transverse direction. According to the invention, the difference between the average wide distance a1 and the average narrow distance a2 is at least 50% of the diameter of the upper longitudinal threads O1-O3.In the present embodiment, all upper longitudinal threads have the same circular first cross-section, while all lower longitudinal threads have the same circular second cross-section. Furthermore, in the present embodiment, the two wide distances a1 have the same average value for the sake of simplicity. However, this is not mandatory.

[0029] In this first embodiment, the lower longitudinal threads U1-U3 essentially all have the same distance A1 from each other.

[0030] Figure 2shows a schematic view of a second embodiment of a fabric tape according to the invention. Here, only the upper longitudinal threads 01-03 and the lower longitudinal threads U1-U4, which together form a repeating unit WE, are visible, but not the upper transverse threads interwoven with the upper longitudinal threads 01-03 to form an upper fabric layer, the lower transverse threads interwoven with the lower longitudinal threads U1-U4 to form a lower fabric layer, and the binding threads connecting the upper fabric layer to the lower fabric layer. The binding threads are preferably again an integral part of the weave pattern, in particular a plain weave, of the upper fabric layer, whereas they do not contribute to the weave pattern of the lower fabric layer.

[0031] This fabric band is also composed of repeating repeats. With regard to the upper longitudinal threads 01-03 and the lower longitudinal threads U1-U4, a repeat can in principle consist of exactly one single repeat unit WE. However, a repeat often comprises several such repeat units WE. It should be noted that a repeat is defined not only by the longitudinal threads, but also by the cross threads and binding threads. If the upper fabric layer is a plain weave, which is preferred, a repeat must have an even number of upper longitudinal threads. Since the repeat unit WE in the second embodiment is also according to Figure 2 has three upper longitudinal threads 01-03, the repeat must comprise an integer multiple of the repeat units WE, i.e. at least two repeat units WE.

[0032] In the present second embodiment, a repeating unit WE is formed from three groups of longitudinal threads, namely a first group I, comprising only one upper longitudinal thread O1 and one lower longitudinal thread U1, a second group comprising one upper longitudinal thread O2 and two lower longitudinal threads U2 and U3, and a further first group I,comprising only one upper longitudinal thread O3 and one lower longitudinal thread U4. Between the first upper longitudinal thread O1 and the second upper longitudinal thread O2 there is a first, relatively wide distance a1. The same relatively wide distance a1 is also located between the second upper longitudinal thread O2 and the adjacent third upper longitudinal thread O3. In contrast, the distance a2 between the third upper longitudinal thread O3 and the adjacent upper longitudinal thread O1 of a next repeating unit is significantly narrower. This results in a sequence of the distances of the upper longitudinal threads O1-O3 in the transverse direction of the woven tape of wide distance a1, wide distance a1, narrow distance a2, with this sequence repeating continuously in the transverse direction. According to the invention, the difference between the average wide distance a1 and the average narrow distance a2 is at least 50% of the diameter of the upper longitudinal threads O1-O3.

[0033] In this second exemplary embodiment, the lower longitudinal threads U1-U4 have different distances from one another. There is a first, relatively large distance A1 between the first lower longitudinal thread U1 and the second lower longitudinal thread U2, as well as between the third lower longitudinal thread U3 and the fourth lower longitudinal thread U4, whereas there is a second, relatively small distance A2 between the second lower longitudinal thread U2 and the third lower longitudinal thread U3. The first, relatively wide distance A1 is also located between the fourth lower longitudinal thread U4 and a first lower longitudinal thread U1 of an immediately adjacent repeating unit. Thus, in this exemplary embodiment, with regard to the spacing of the lower longitudinal threads, there is a continuously repeating sequence of first distance, second distance, first distance, first distance in the transverse direction of the fabric tape.

[0034] In this exemplary embodiment, all upper longitudinal threads 01-03 have the same circular cross-section relative to one another, and all lower longitudinal threads U1-U4 have the same circular cross-section relative to one another, albeit larger. Furthermore, in the present exemplary embodiment, the two wide distances a1 have the same average value for the sake of simplicity. However, this is not mandatory.

[0035] For example, the dimensions in this embodiment can be selected as follows: Diameter of upper longitudinal threads O1-O4: 0.14mm Diameter of lower longitudinal threads U1-U3: 0.19mm first distance A1: 0.095mm first distance A2: 0.049mm Distance a1: 0.2645mm Distance a2: 0.145mm

[0036] This results in a length of the repeating unit WE of 1.094 mm. The difference between the first distance A1 and the second distance A2 is 0.046 mm, which corresponds to 33% of the diameter of the upper longitudinal threads.

[0037] It should also be noted in general that the spacing, especially the spacing a1 and a2 between the upper longitudinal threads 01-03, does not have to be constant across the entire length of the fabric tape. These can also become narrower and wider again. Therefore, the respective average spacing should be taken into account.

[0038] Figure 3shows a schematic view of a third embodiment of a fabric tape according to the invention. Here, only the upper longitudinal threads 01-03 and the lower longitudinal threads U1-U2, which together form a repeating unit WE, are visible, but not the upper transverse threads interwoven with the upper longitudinal threads 01-03 to form an upper fabric layer, the lower transverse threads interwoven with the lower longitudinal threads U1-U2 to form a lower fabric layer, and the binding threads connecting the upper fabric layer to the lower fabric layer. The binding threads are preferably again an integral part of the weave pattern, in particular a plain weave, of the upper fabric layer, whereas they do not contribute to the weave pattern of the lower fabric layer.

[0039] This fabric band is also composed of repeating repeats. With regard to the upper longitudinal threads 01-03 and the lower longitudinal threads U1-U2, a repeat can in principle consist of exactly one single repeat unit WE. However, a repeat often comprises several such repeat units WE. It should be noted that a repeat is defined not only by the longitudinal threads, but also by the cross threads and binding threads. If the upper fabric layer is a plain weave, which is preferred, a repeat must have an even number of upper longitudinal threads. Since the repeat unit WE in the third embodiment is also according to Figure 3 has three upper longitudinal threads 01-03, the repeat must comprise an integer multiple of the repeat units WE, i.e. at least two repeat units WE.

[0040] In the present third embodiment, a repeating unit WE is formed from two groups of longitudinal threads, namely a first group I,comprising only one upper longitudinal thread O1 and one lower longitudinal thread U1, and a second group comprising two upper longitudinal threads O2 and O3 and one lower longitudinal thread U2. Between the first upper longitudinal thread O1 and the second upper longitudinal thread O2 there is a first, relatively wide distance a1. The same relatively wide distance a1 is also located between the third upper longitudinal thread O3 and the adjacent first upper longitudinal thread O1 of an adjacent repeating unit WE. In contrast, the distance a2 between the second upper longitudinal thread O2 and the adjacent upper longitudinal thread O3 is significantly narrower. This results in a sequence of the distances of the upper longitudinal threads 01-03 in the transverse direction of the fabric tape of wide distance a1, wide distance a1, narrow distance a2, with this sequence repeating continuously in the transverse direction.According to the invention, the difference between the average wide distance a1 and the average narrow distance a2 is at least 50% of the diameter of the upper longitudinal threads 01-03.

[0041] In this third exemplary embodiment, the lower longitudinal threads U1 and U2 have different distances from one another. A first, relatively large distance A1 exists between the second lower longitudinal thread U2 and the first lower longitudinal thread U1 of an adjacent repeating unit WE, whereas a second, relatively small distance A2 exists between the first lower longitudinal thread U1 and the second lower longitudinal thread U2 within this repeating unit WE.

[0042] In this exemplary embodiment, all upper longitudinal threads 01-03 have the same circular cross-section relative to one another, and all lower longitudinal threads U1 and U2 have the same circular cross-section relative to one another, albeit larger. Furthermore, in the present exemplary embodiment, the two wide distances a1 have the same average value for the sake of simplicity. However, this is not mandatory.

Claims

1. Fabric tape, in particular forming screen, for a machine for producing and / or processing a fibrous web comprising an upper fabric layer with upper longitudinal threads and upper transverse threads interwoven with the latter, and a lower fabric layer with lower longitudinal threads and with lower transverse threads interwoven with the latter, wherein the two fabric layers are disposed on top of one another in such a manner that, in the intended use of the fabric tape, the upper fabric layer faces the fibrous web and the lower fabric layer faces away from the fibrous web, wherein the upper longitudinal threads are unevenly spaced apart from one another, characterized in that the upper longitudinal threads are disposed in such a manner that their average spacings have the following sequence, which is repeated continuously in the transverse direction of the fabric tape: wide spacing, wide spacing, narrow spacing, wherein the difference between an average wide spacing and an average narrow spacing corresponds to at least 50% of a diameter of an upper longitudinal thread.

2. Fabric tape according to Claim 1, characterized in that the wide spacing is between 100% and 300% of a diameter of an upper longitudinal thread, and / or in that the narrow spacing is between 30% and 125% of a diameter of an upper longitudinal thread.

3. Fabric tape according to Claim 1 or 2, characterized in that the ratio of upper warp threads to lower warp threads in the fabric tape is 1:1, wherein the lower warp threads are preferably spaced identically apart from one another.

4. Fabric tape according to Claim 1 or 2, characterized in that the weaving pattern of the fabric tape repeats itself in repeats, wherein the upper longitudinal threads and the lower longitudinal threads are disposed in several groups in each repeat, with a first group and a second group and at least another of first and / or second group, wherein each first group is formed from an upper longitudinal thread and disposed therebelow a lower longitudinal thread, and each second group is formed from an upper longitudinal thread and disposed therebelow two lower longitudinal threads.

5. Fabric tape according to Claim 4, characterized in that the two lower longitudinal threads of a second group have the mutual second spacing from one another, while the two lower longitudinal threads of a first group and of a second group directly adjacent thereto, and / or the two lower longitudinal threads of two first groups directly adjacent thereto, have the first spacing.

6. Fabric tape according to Claim 1 or 2, characterized in that the weaving pattern of the fabric tape repeats itself in repeats, wherein the upper longitudinal threads and the lower longitudinal threads are disposed in several groups in each repeat, with a first group and a second group, wherein the first group is formed from one upper longitudinal thread and disposed therebelow a lower longitudinal thread, and the second group is formed from two upper longitudinal threads and disposed therebelow one lower longitudinal thread.

7. Fabric tape according to one of Claims 4 to 6, characterized in that a first spacing between two directly adjacent lower longitudinal threads is greater than a second spacing between two directly adjacent lower longitudinal threads, wherein the difference between the first spacing and the second spacing is between 25% and 200% of a diameter of an upper longitudinal thread.

8. Fabric tape according to one of the preceding claims, characterized in that the difference between the average wide spacing between two directly adjacent upper longitudinal threads and the average narrow spacing between two directly adjacent upper longitudinal threads is a maximum of 200%, preferably a maximum of 150%, of a diameter of an upper longitudinal thread.

9. Fabric tape according to one of the preceding claims, characterized in that the first and the second fabric layer are connected to one another by binding threads disposed in pairs.

10. Fabric tape according to Claim 9, characterized in that the binding threads extend in the transverse thread direction.

11. Fabric tape according to Claim 9 or 10, characterized in that the two binding threads of the respective pair of binding threads are interwoven so as to mutually alternate with upper and lower longitudinal threads, and intersect one another when changing from interweaving with upper longitudinal threads to interweaving with lower longitudinal threads, and vice versa, while forming intersection points.

12. Fabric tape according to Claim 11, characterized in that each pair of binding threads provides at least two intersection points per repeat.

13. Fabric tape according to one of Claims 9 to 12, characterized in that the upper fabric layer is formed by interweaving the upper longitudinal threads with the upper transverse threads and the binding threads, and the lower fabric layer is formed by interweaving the lower longitudinal threads with the lower transverse threads.

14. Fabric tape according to one of the preceding claims, characterized in that the upper fabric layer forms a plain weave.