EP2425045A1

EP2425045A1 - Fabric, in particular for an airbag

Info

Publication number: EP2425045A1
Application number: EP10719913A
Authority: EP
Inventors: Norbert Huber; Thomas Eschbach
Original assignee: Global Safety Textiles GmbH
Current assignee: Global Safety Textiles GmbH
Priority date: 2009-04-30
Filing date: 2010-04-30
Publication date: 2012-03-07
Also published as: US20120058699A1; CN102459730A; JP2012525508A; MX2011011440A; DE102009019638A1; CA2760593A1; KR20120016259A; WO2010124876A1

Abstract

A fabric is described, in particular for an airbag, consisting at least partially of hollow filament yarns (K, S) made of a polymer material, wherein the fabric has a cover factor DG, according to Professor Walz, that is equal to the cover factor when using solid filament yarns of the same diameter.

Description

Fabric, in particular for an airbag

The present invention relates to a fabric, in particular for an airbag, which consists at least partially of hollow filament yarns of polymer material.

Such fabrics are known, for example, from the European patent EP 0 616 061 B1 by AKZO, wherein the contact or filter fabrics disclosed there are woven with different thread densities and different yarn diameters. This initially has the disadvantage that the tissue is still too heavy despite the use of hollow fibers. At this point, the ever-increasing demands of the automobile manufacturers on weight reduction do not need to be particularly addressed.

The full and hollow fibers woven in the woven fabric disclosed therein have the same denier, since the inventor assumed that the required high air permeability and the high-strength fabric required full and hollow fibers of the same yarn strength and therefore the same material mass in cross section. Due to the resulting different diameters of full filaments and hollow fibers resulting in processing both types of thread to a textile surface a restless and unevenly thick fabric with different thread density at full filaments (higher thread density) and hollow fibers (thread density lower). It is also unfavorable that such fabrics are difficult to coat evenly. The use of hollow fibers also increases, among other things, the fabric thickness and leads to voluminous airbags with the disadvantage of a higher packing volume. The fabrics according to EP 0 616 061 B1 also have, in regions, a different fabric density and thus also an uneven air permeability. This gives the for calculation - -

the tissue density (in contrast to the calculation in EP O 616 061 B1) correctly applied method according to Prof. Walz. A non-uniform air permeability is very unfavorable for a fabric for an airbag, since the determination of the "service life" of the airbag, so the time in which it remains inflated, so its real task is not reliable possible.

It is known to increase the heat capacity of fabrics with hollow fibers or hollow fibers containing them. In order to utilize this effect, EP 0 616 061 B1 uses hollow fiber yarn and full-fiber yarns of different thickness, which leads to the disadvantages already mentioned above.

In addition, EP 0 616 061 B1 complains that a hollow area fraction of over 40% leads to a stiffening of the fiber and thus to a deterioration of the foldability of the airbag fabrics and exemplifies that the yarns wholly or partially composed of hollow fibers have a yarn denier of 200 - 1100 dtex exhibit. Smaller titers are problematic in terms of production performance, and larger titers can not be used because of the then severely deteriorated foldability of the airbag fabrics.

Important to mention is that here the production of hollow filaments by the retention of Garntiters and an addition of the respective lumen takes place, d. h., As a result, the polymer composition in the hollow filament sheath is equal to the polymer mass in the full filament. The lumen is added and increases the thread diameter. As a result, fewer threads / cm are required in the constructions described in EP 0 616 061 B1. The integration (ondulation) of the thicker yarns and thus the resistance to the pulling apart of the weave of warp and weft threads are, however, lower. Furthermore, the thicker the thread walls (annular surface) are, the more rigid the hollow filaments are, and thus - this is a disadvantage - they offer greater resistance to undulation.

The present invention has the object to provide a fabric for an airbag, in which the disadvantages of the prior art are avoided or at least greatly reduced.

The object is achieved according to the invention with a fabric, in particular for an airbag, which at least partially consists of hollow filament yarns of polymer material and is characterized in that the fabric has a fabric density DG ₁ calculated according to Prof. Walz, which is equal to the fabric density when using full filament yarns of the same diameter. The fabric according to the invention advantageously makes it possible to make targeted use of a property of hollow filaments by increasing the heat capacity or the heat resistance of the fabric with a consistently high density (LD) and high comb extraction force, and with lower weight compared to known fabrics. Advantageously, in the use of hollow fiber yarns and full fiber yarns according to the invention, the stiffness, the fabric thickness and the fabric density remain constant. The Kammausziehkraft (measure of the seam strength) increases advantageously even. The fabric according to the invention is particularly suitable for air bags or airbags for passenger restraint systems in vehicles and aircraft.

The fabric according to the invention is lighter than a similar fabric except for the hollow fibers due to the fact that the diameter of hollow fiber yarns and full fiber yarns is the same, the weight reduction corresponding to the lumen percentage. Fortunately, the packing density of an airbag produced from the fabric according to the invention remains constant, which is why changes in module dimensions when using the fabric according to the invention are not required. Another significant advantage results from the fact that the lower fabric weight allows advantageously improved mass acceleration during the highly dynamic inflation process. In addition, the hollow fibers of the same diameter z. B. process in combination with full threads advantageously to a uniform textile surface.

The present invention is based on a fabric construction in which

the Gamtiter of the hollow filaments decreases with increasing lumen% set,

- the yarn diameter, the thread and the fabric density remain the same,

the walls of the ring surfaces of the hollow filaments become thinner with increasing lumen% set and

- the formula: Lumen -% - reduction = weight reduction applies.

Definition "Lumen% set": The lumen percentage indicates the proportion of the lumen of a hollow filament in relation to the total cross section of the hollow filament.

Accordingly, in the case of fabrics known from the prior art, there is a (negative) increase in the stiffening of the hollow filaments as the surface area of the hollow fibers increases. - A -

Part is known to be recorded in the inventive design principle with increasing lumen a thinner Ringflächenwandung, which fortunately does not increase the bending stiffness of the hollow filaments.

With the thinner Ringflächenwandung the binding of the threads of the same diameter as in full filaments. In highly dense fabrics, the hollow filaments, which are round per se, will form the respective deflection by oval bending at the setting points, whereby the resistance to the comb separation advantageously increases (more frictional resistance).

For example, according to the invention hollow filaments in a thread sequence (warp and / or weft) of solid to hollow filaments, z. B. 1 thread full filament and 1 filament hollow filament are woven.

When using the fabric according to the invention, it is also possible advantageously to use a hollow thread as an embroidery stitch (see German Patent DE 101 15 890 B2) in thermally stressed zones of a one-piece woven airbag (so-called one-piece woven, OPW). This is therefore only possible with the fabric according to the invention, since due to the same diameter of all threads an intolerable thick-thin effect with uneven fabric or OPW surface can be avoided.

In an advantageous embodiment of the invention, the fabric is characterized in that the hollow filament yarns have a lower titer than full filament yarns of the same diameter and the same polymer, which has many advantages discussed below. Thus, the rigidity, the fabric thickness and the fabric density are constant. This simplifies the production of uniform fabrics (see above). Also, the comb pull-out force (measure of seam strength) is higher than comparable fabrics made from solid filaments.

In a further advantageous embodiment of the invention, the fabric is characterized in that it has full filament yarns of the same diameter and the same polymer, and in that the hollow filament yarns are arranged at predefined points of a weave repeat in warp and / or weft and in weave construction opposite to canvas L1 / 1 with higher thread density than in a L1 / 1 weave construction are involved. This advantageously allows the technological and design technology targeted arrangement of hollow fiber yarns in z. B. thermally critical areas of a tissue or OPW.

In a further advantageous embodiment of the invention, the fabric is characterized in that it has full filament yarns of the same diameter and the same polymer, and that the hollow fibers as embroidery in particularly thermally stressed zones of a one-piece woven airbag (so-called one-piece-woven, ie OPW) are arranged and in relation to canvas L1 / 1 higher-weave weave construction and with higher thread density than in a L1 / 1 Web construction are involved.

In a further advantageous embodiment of the invention, the fabric is characterized in that the hollow area content of the hollow fiber yarns is in the range of greater than or equal to 20%. This hollow area fraction has been found in experiments to be particularly favorable.

In a further advantageous embodiment of the invention, the tissue is characterized in that the tissue density according to Prof. Walz [DG%] is greater than 100%. The resulting strength of the fabric is of particular advantage in an airbag used as a safety component.

In a further advantageous embodiment of the invention, the tissue is characterized in that the tissue density according to Prof. Walz [DG%] is greater than 105%.

In a further advantageous embodiment of the invention, the fabric is characterized in that the weight of the fabric is lower when using hollow filaments compared to solid filaments in the amount of the lumen percentage. This lower weight compared with the fabric variants known from the prior art allows a particularly advantageous improved mass acceleration during the highly dynamic inflation process of the airbag.

In a further advantageous embodiment of the invention, the tissue is characterized in that the relevant for determining the tissue density according to Prof. Walz effective titer to the induced shrinkage is above the initial titer. - -

In a further advantageous embodiment of the invention, the fabric is characterized in that hollow fibers are embroidered in embossed areas in thermally stressed zones of a one-piece woven airbag (so-called one-piece woven fabric, OPW).

In a further advantageous embodiment of the invention, the fabric is characterized in that the polymer material is polyester and a) the yarn diameter (d), b) the thread density per cm, c) the fabric density DG, calculated according to Prof. Walz, d) the fabric thickness and e) the fabric weight is that of a nylon 6,6 full filament web.

The fabric of the invention can thus be advantageously prepared with polyester yarns with hollow filaments, the higher specific gravity of the polyester compared to the currently used material polyamide due to the invention achievable weight reduction of about 21% is compensated by a correspondingly selected lumen of the hollow fibers.

In a further advantageous embodiment of the invention, the fabric is characterized in that it has a thread density which is the same as when using VoII filament of the same diameter and the same Webkonstruktion.

In a further advantageous embodiment of the invention, the fabric is characterized in that it has a fabric thickness which is the same as when using Vollfilamentgamen same diameter and the same Webkonstruktion.

In a further advantageous embodiment of the invention, the fabric is woven as OPW fabric with single-layered and double-layered regions, characterized in that it has substantially elongated tubular structures or tubes running in the warp or weft direction, the single-layered regions containing hollow filaments.

Both in the preceding description and with reference to tables A and B, exemplary embodiments are shown in the area of high-density, uncoated fabric. The use of hollow filaments made of polymer material whose lumen% rate corresponds to the reduction of the garnet titer and thus the yarn diameter is the same as that of the corresponding vole filament with a higher titer by the lumen% set is shown in further advantageous embodiments. gene of the invention possible, for example as a tubular tissue with running in the warp or weft direction Tubes. Here, advantageously two-day woven tubes are executed because of the high tensile load with solid filaments in the direction of tensile stress. The single layer areas contain hollow filaments for the purpose of weight saving. Depending on the function, the thread system running transversely to the tubes (usually the weft threads) can be designed either in solid or in hollow filaments or in alternating thread sequence.

In yet another advantageous embodiment of the invention, the fabric is characterized in that the transverse to the tubes thread system is executed either in solid or in hollow filaments.

In yet another advantageous embodiment of the invention, the tissue is characterized in that the transverse to the tubes thread system is executed in alternating thread sequence.

In yet another advantageous embodiment of the invention, the fabric is characterized in that the tubular structures or tubes are formed in the warp and weft direction of hollow filaments and the single-layer areas are formed in particular in the direction of special tensile stress of solid filaments. This fabric offers the following advantages: If the tubes have to fulfill the function of a special thermal resistance or insulation, the tubes are produced in the warp and weft direction from hollow filaments. The single-layer intermediate region is then advantageously in the direction of special tensile stress of solid filaments.

Hollow filament fabrics according to the invention have a uniform surface (without thick-thin effects). They are therefore ideal for coating. A coated hollow filament fabric is given a specific additional function by the coating, the coating weight being compensated by the reduction of the basis weight of the carrier fabric (hollow filament fabric). In addition, the oval filament lying in the bond point leads to a larger adhesive surface for the coating composition.

The fabrics of solid or hollow filaments according to the invention with the same density, thickness and, above all, comb pull-out force are suitable for ready-to-use mixing. The seam construction is not affected. At the here described NEN exemplary embodiments are either the substitution of full filaments by hollow filaments or a web technical mixing assembly.

For clarification, it is stated that the tissue according to the invention also means a one-piece woven airbag (so-called one-piece-woven, OPW). Thus, an airbag can be produced from a flat fabric according to the invention having hollow fibers of the same thickness, in warp-knit warp and / or weft with solid fibers or in OPW technology.

The denier of a yarn is defined by the weight of 10,000 m thread length in grams (dtex). Consequently, the titer is calculated from the base area - with hollow filaments only from the ring area around the cavity - the thread mass multiplied by the specific weight and the length of 10,000 m.

The thread diameter d of hollow fibers is calculated from the total base area F _R mg plus F e_um _e n according to the following formula:

dtex

Fges or ring ~ [mm J g / cm ³ x 10,000

Taking into account the lumen percentage [Lumen%], the total area Fg _is calculated in mm ² from F _Rιng . The thread diameter d is calculated on the basis of the formula according to Prof. Walz for the calculation of the fabric density as follows:

V Fges d = [m _m ]

0.885

The terminology of various terms used here is to be understood as follows: Hollow fiber yarns are hollow yarns or synthetic filament yarns with filaments which are hollow inside, with a hollow area proportion based on the total cross-sectional area of the filaments.

The fabric density [DG] according to Prof. Walz is defined in "The Fabric Density I" and "The Fabric Density II" in the publication "Textilpraxis" of 1947, pages 330 to 366, Robert Kohlhammer-Verlag, Stuttgart, Germany. The calculation of the - -

DG requires the determination of the yarn counts, the settings and the knowledge of the density of the pulp used. The calculation of the fabric density DG% according to Prof. Walz:

Fabric density DG% = (d _k + d _s) ^{2 •} _k ^• f _s f

In this case: d _k / d _s = substance diameter of the warp or weft yarn in mm; f _k / f _s = number of warp threads or weft threads per cm;

The substance diameters of the filaments made of solid filaments are calculated as follows:

Vdtex _ks dks = [mm]

88.5 ^• V-density g / cm ³

{The above formula applies only to plain weaves (fabric density I). If there are other higher-binding bindings other than the plain weave - ie weaves or weave constructions higher than the canvas L1 / 1 - then the calculated fabric densities should be multiplied by certain factors (eg twill 2: 1 = 0.70, twill 2) : 2 = 0.56, twill 3: 1 = 0.56, twill 4: 4 = 0.38, satin 1: 4 = 0.49, Panama 2: 2 = 0.56), thus obtaining the fabric density II .}

Interpretation of the calculation of the tissue density according to the formula of Prof. Walz:

1. Effective titre:

The effective titer is calculated for the full thread from the circular area and the hollow thread from the ring area.

2nd thread diameter:

The thread diameter (d) is relevant for the calculation of the fabric density and, in the case of hollow filaments, results from the total cross-sectional area (ring area + hollow area).

3. Correlation of thread thickness, thread density and binding:

The area requirement per bond point (at L1 / 1) results in mm ² from (d _k + d _s ) ² . The quotient of 100 mm ² : (d _k + d _s ) ² corresponds to the max. possible number of binders points per cm ² = 100%. The product of / _k x / _s corresponds to the number of bond points reached per cm ² .

The following embodiments are supported by FIGS. 1 to 4 for the purpose of illustration.

Fig. 1 shows schematically a section of a woven cartridge.

Fig. 2 shows schematically an example of a homogeneous polymer plate.

Fig. 3 shows schematically an example of a "sandwich plate".

Fig. 4 shows schematically the integration of hollow filaments in the warp and weft directions.

Fig. 5 shows schematically an example of a Tubativgewebes with running in the warp or weft direction Tubes in a first embodiment.

Fig. 6 shows schematically another example of a tubular fabric with running in warp or weft direction Tubes in a second embodiment.

Fig. 1 shows schematically a section of a woven cartridge for the binding L 1/1 and the associated sectional image seen in warp and weft direction.

The formula for calculating the fabric density (DG%) according to Prof. Walz is derived from:

100 xf _κ xf _s = DG%

100

(d _κ + ds) ² x f κ x fs = DG%

The yarn diameter (d) is the geometrically correct value in [mm] in approach, ie, the substance diameter in solid filaments and the total diameter of ring and hollow surface (F _ges ) in hollow filaments.

EP 0 616 061 B1 teaches that even with a hollow area fraction of 20%, an increase in the thermal resistance of about 175% occurs. This statement is based on following calculation model: The assumed area of 1 m ² with a weight of 210 g / m ² is divided by the specific gravity in g / m ³ . The result (FIG. 2) is the thickness dv of a homogeneous polymer plate of 1 m ² , in the example given, of 0.18 mm for PA 6.6.

Fig. 2 shows an example of a homogeneous polymer plate of 1 m ² area.

The wall thickness thus obtained is divided by the coefficient of thermal conductivity (λ), to obtain as a result the thermal resistance Rw [K / W] of the solid surface. The thermal resistance (Rw) of the hollow surfaces is according to the same principle, for. B. charged at 20% lumens with two different media.

Fig. 3 shows an example of a "sandwich plate" of 1 m ² , in which the "outer walls" A enclosing the lumen L of "thickness" 0.036 mm have a thickness ie of 0.09 mm.

From the sum of Rw of the wall + Rw of the hollow surface results in about 175% higher thermal resistance compared to the solid surface. Comparing the thermal resistance of a solid filament to that of a 20% lumen hollow filament calculated with the same parameters results in a relative increase in Rw of> 300% in the package. In both models, the heat transfer is assumed to be vertical or radial to the wall surface.

The model of EP 0 616 061 B1 is based on a closed polymer plate, but the design features of a textile surface (binding, ondulation) are not taken into account.

By contrast, the model according to the present invention is based on the geometrically correct structure of the package, but only detects the heat transfer in the radial direction. Taking into account the fabric construction (incorporation of the package, type of binding, DG-%), the direction of heat application is different with respect to the package, ie radially to axially. In addition, it must be considered that under radial heat application, the thermal resistance in the annular surface is less than in the lumen and therefore the direction of the heat application is not rectilinear. 4 shows the integration of hollow filaments K and S, shown in sections, in the warp and weft directions schematically shown in section as plain weave (L 1/1). In the case of an application of heat perpendicular to the textile surface in the direction of arrow V, the heat transfer takes place correspondingly differently to the course of the thread.

This leads to the following advantageous result: If both full filaments and hollow filaments are processed in a textile surface, or in OPWs, then on thermally stressed surfaces, the hollow filaments are preferably also used in high-tensile weave constructions, e.g. B. Panama in possibly higher weaving density or thread density enter (fabric density II).

Fig. 5 shows schematically an example of a tubular tissue with running in the warp or weft direction Tubes in a first embodiment. Tubes with full filaments shown by way of example in the form of honeycombs "honeycombed" in the drawing direction bear the reference numeral 2. Single-layer intermediate regions with hollow filaments in the pulling direction lying between the tubes 2 are denoted by 4. The associated transverse filament system hollow filament bears the reference numeral 6.

FIG. 6 schematically shows an example of a tubular tissue with tubes running in warp or weft direction in a second embodiment. There, by way of example, tubes with hollow filaments in the warp and weft directions shown in a honeycomb shape are provided with the reference numeral 12. Between the tubes 12 of the embodiment according to Fig. 6 lying single-layer intermediate regions with solid filaments in the pulling direction are designated 14. The associated transverse filament system with hollow filaments carries the reference numeral 16.

In order to show how the invention can be carried out, it is briefly explained below with reference to exemplary embodiments.

Exemplary embodiments I and II follow Table A

Table A above shows a comparison of a standard article (full fibers only) with two embodiments I and II (hollow fibers only) of the fabric according to the invention. The substitution of full filaments by hollow filaments of the same polymer in a uniformly dense textile surface at the same filament diameter (d) leads to a lower titer and a lower tissue weight by the lumen percentage.

The high-density fabric "standard article" (prior art) consists of polyamide 6.6 (PA 6.6) full filaments and is to be substituted in the same fabric density by a surface construction at least partially of PA 6.6 hollow filaments.

The tightness of the fabric is needed because of the LD in connection with uncoated insert and high seam strength (comb extraction force). In terms of strength and weight, the fabric is over-engineered according to standard articles.

Embodiment I

Embodiment I starts from an existing PA 6.6 yarn in titre dtex 380/72 with 20% lumen. Taking into account the specific shrinkage values - the induced shrinkage is in a defined ratio to the nominal shrinkage (hot air shrinkage of the yarn) and is dependent on the finishing process - is over the specified fabric density of 106.4% according to Prof. Walz on the basis of the thread diameter in the finished fabric (after shrinking) set the corresponding thread density of the finished product (22 x 22 Fd / cm).

The square meter weight, calculated from thread density, incorporation and effective titer (after shrinkage), is lower by the percentage of the lumen (lumen%), and the maximum tensile forces in N / 5cm are correspondingly reduced.

Due to its density, the fabric has the required seam strength (comb extraction force). Exemplary embodiment II

In the exemplary embodiment II, a fabric of PA 6.6 hollow filaments having exactly the same parameters (DG%, thread diameter, thread density) of the finished fabric is produced according to the "standard article." Starting from the required effective titer and taking into account the shrinkage value (triggered) Shrinkage) is determined retrograde the nominal titer as the starting value for the required yarn.

The reduction of the square meter weight corresponds to the lumen percentage, and the maximum tensile forces in the warp and weft direction are reduced by the same percentage to approximately the same absolute values due to the different yarn counts in the warp and weft directions. In view of a biaxial tensile load of the tissue, this equivalence is advantageous. With the exemplary embodiment II, the substitution of the so-called standard fabric under improved technical conditions of use (no longer "over engineered", lighter) by a hollow filament fabric is possible.

Embodiment III

In the following, another exemplary embodiment IM is explained in Table B, wherein the known "standard article from PA 6.6 using polyester hollow filaments with the same finished fabric parameters is readjusted. The procedure corresponds to the exemplary embodiment II. Thus, it is also possible to prove that the material polyester can be used more cost-effectively for airbag fabrics.

The fabric (standard article) in a dense construction of PA 6.6, dtex 470, 22 x 21 with DG = 106.4% in L 1/1 should have the same density and the same thread thickness (thread diameter) using a corresponding PES hollow filament Thread produced.

Substitution of solid filaments by hollow filaments of another polymer in a uniform dense textile fabric results in equal denier and fabric weight at the same filament diameter (d) and a lumen percentage which is the percentage difference in specific gravity of both polymers. See Table B. Table B

The use of the 20% lumen PES hollow fiber (cavity in the fiber) makes it possible to produce a fabric of the same density despite the higher specific gravity (+ 21%) in the same weight class.

Taking into account different yarn and shrinkage values and incorporation conditions, the following formula applies: weight reduction = lumen -%.

The use of hollow filaments of the same diameter in textile surfaces made of full filaments (mixed build) results in the same binding construction (eg canvas L1 / 1) same fabric thickness with simultaneous weight reduction. In zones subject to particularly high thermal stress, the filament density for hollow filaments can be correspondingly increased by higher-binding construction with constant fabric density (DG II).

Examples:

a) Flat woven fabric with 1 thread full filament and 1 filament hollow filament alternately in the warp and weft directions. The fabric becomes lighter with the same remaining structure.

b) Flat woven fabric with predefined locations with hollow filament entry in a higher-weave weave construction serves for improved heat resistance. Entry in chain and / or shot.

c) Use of hollow filaments as embroidery in OPW - possibly in a higher-weave weave construction - for the purpose of improving thermal resistance.

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Claims

claims

1. fabric, in particular for an airbag, which consists at least partially of Hohlfilamentgamen of polymer material, characterized in that the fabric has a fabric density DG, calculated according to Prof. Walz, which is equal to the fabric density when using full filament yarns of the same diameter.

2. Fabric according to claim 1, characterized in that the hollow filament yarns have a lower titer than Vollfilamentgame same diameter and the same polymer.

3. fabric according to claim 1 or 2, characterized in that the fabric weight in the range of hollow filaments used for their lumen percentage is less than when using solid filaments.

A fabric according to claim 1, 2 or 3, characterized in that the weave construction (weave) is L1 / 1 or higher.

5. A fabric according to claim 4, characterized in that it comprises Vollfilamentgar- ne same diameter and the same polymer, and that the hollow filament yarns are arranged at predefined locations of a Web Repeat in warp and / or weft and in relation to L1 / 1 higher weave weave and with higher thread density than in a L1 / 1 weave construction are involved.

6. A fabric according to claim 4, characterized in that it comprises full filament yarns of the same diameter and the same polymer, and in that the hollow fibers are embroidered in thermally stressed zones of a piece woven airbag (so-called one-piece woven fabric, OPW). are arranged and bound in relation to L1 / 1 higher-weave weave construction and with higher thread density than in a L1 / 1 weaving construction.

7. A fabric according to any one of claims 1 to 6, characterized in that the hollow area proportion or lumen percentage of hollow filament yarns is 20% or higher.

8. Fabric according to one of the preceding claims, characterized in that the fabric density according to Prof. Walz [DG%] is greater than 100%.

9. A fabric according to claim 8, characterized in that the fabric density according to Prof. Walz [DG%] is greater than 105%.

10. A fabric according to any one of the preceding claims, characterized in that the hollow filament yarns and the full filament yarns are polyester yarns.

11. A fabric according to claim 1, wherein the polymer material is polyester, characterized in that a) the yarn diameter (d), b) the thread density per cm, c) the fabric density DG, calculated according to Prof. Walz, d) the fabric thickness and e ) the fabric weight is equivalent to that of a nylon 6,6 full filament web.

12. A fabric according to any one of the preceding claims, characterized in that the fabric has a uniform Kammausziehkraft.

13. A fabric according to any one of the preceding claims, characterized in that it has a thread density which is equal to or higher than when using solid filaments of the same diameter and the same weave construction.

14. A fabric according to any one of the preceding claims, characterized in that the fabric has a fabric thickness which is equal to or greater than when using full filament yarns of the same diameter and the same weave construction.

15. A fabric according to any one of the preceding claims, which is woven as OPW fabric with single-layer and two-ply areas, characterized in that it has in the warp or weft direction extending substantially elongated tubular structures or tubes, wherein the single-layer areas contain hollow filaments.

16. A fabric according to claim 15, characterized in that the transverse to the tubes thread system is executed either in solid or in hollow filaments.

17. A fabric according to claim 15, characterized in that the transverse to the tubes thread system is executed in alternating thread sequence.

18. A fabric according to claim 15, characterized in that the tubular structures or tubes are formed in the warp and weft direction of hollow filaments and the single-layer areas are formed in particular in the direction of special tensile stress of solid filaments.

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