EP1888824A1

EP1888824A1 - Flat woven textile structure

Info

Publication number: EP1888824A1
Application number: EP06753648A
Authority: EP
Inventors: Hans-Albert Graefe; Thomas Eschbach; Holger Saint-Denis; Thomas Dede; Jörg RUSCHULTE
Original assignee: Global Safety Textiles GmbH
Current assignee: Global Safety Textiles GmbH
Priority date: 2005-05-17
Filing date: 2006-05-16
Publication date: 2008-02-20
Also published as: WO2006122752A1; CN101189375A; JP2008540237A; CA2608786A1; DE102005022567A1

Abstract

The invention relates to a flat woven textile structure for use as airbag fabric which is characterized by cross weaves, and to a mesh fabric which consists of stationary warp threads (21) and regular weft threads (23) and which is not undulated. The cross weaves are carried out in such a manner that the right-hand threads (22) have a lower titer than the stationary warp threads (21) and the regular weft threads (23), and that the stationary warp threads (21) and regular weft threads (23) are held and linked one on top of the other in a nonslip manner.

Description

Woven textile fabric

The present invention relates to a woven fabric for use as an airbag fabric and an airbag for passenger restraint systems for water, land, air and space vehicles made using such a fabric. ^■

The requirements for airbag systems in motor vehicles, especially airbags as such, are constantly increasing. Due to the ever smaller design space available in vehicles airbags are required, which make minimal space requirements in the folded state. At the same time, the demands on the technical properties of airbag fabrics are increasing. These include the sliding resistance, the so-called Kammausziehkraft and the increase of the so-called tear strength in airbag fabrics.

For airbag base fabric with reduced thread density intended for coating should also have an increased slip resistance and low design strain.

According to the German patent DE 197 31 797 C2 (TRW) an air bag for occupant protection devices in vehicles is proposed, which has the peculiarity that it consists wholly or partly of a under the action of hot gases superficially carbonized fabric or knitted fabric.

In addition, there is a need for non-slip filter fabrics for use in side panels in passenger birches (so-called window technology). The invention has for its object to provide solutions for the requirements outlined above.

The object is achieved by a woven textile fabric for use as an airbag fabric, which is characterized in that it has leno weaves. Such a fabric can be produced, for example, with a weaving machine described in DE 103 07 489 B3 (Dornier). Such a woven fabric is due to its leno bindings with significantly increased slip resistance (Kammausziehkraft) produced, especially for thinner fabrics, such as dtex 235. Thus, their use for airbag systems with little space are significantly improved. At the same time the tear propagation force is significantly improved on the one hand by the possible lower thread density and on the other hand by the leno weave itself.

In an advantageous development of the sheet according to the invention this is characterized by leno weaves and plain weaves, the ratio of leno weaves to plain weaves is less than 1. This has the particular advantage that the combination of the plain weaves as the densest possible bonds and the leno weaves as the strongest bonds allows ideal conditions for high slip resistance and tear propagation force at the same time realizable air permeability.

In another advantageous embodiment of the invention, the fabric is designed so that the ratio of double or multiple weft yarns to single weft yarns is less than 1. Thus, the slip resistance or comb extraction force can be further improved. Tissue stability is also increasing.

A textile fabric with a ratio of leno weaves to linen weaves of 1/7 has proven to be particularly advantageous.

In another advantageous embodiment of the invention, there was a woven fabric, which is characterized by, consisting of upright and regular weft, fabric grid, which is without Ondulation that of leno threads, which have a lower titer than the uprights and weft , is held on top of each other. This is particularly advantageous in the case of so-called coating base fabric, which is produced with reduced thread density, which due to the construction according to the invention has an increased slip resistance with a smaller design strain. A coated conventional canvas fabric with a thread titer of, for example woven dtex 235, due to the ondulation has a 5 - 10% design strain. Initiated by the airbag internal pressure in the event of a crash, the design strain will first perforate the coating applied to the airbag, and as a result the gas outflow will be unplanned and occur earlier. A textile fabric according to the invention, which may also be called a hybrid leno fabric, has practically only the material expansion of the fabric grid resulting from the stiffening and weft threads. The fabric grid lies on top of each other without undulation, held in place by the leno threads.

Another advantageous development of the sheet according to the invention is characterized by additional carbonizable weft threads, in particular viscose threads whose titer is higher than the titre of the regular weft threads. With a densely-knit hybrid fabric having a carbonizable surface described herein, a heat-resistant airbag fabric, e.g. according to EP 0 893 311 A3 (Dornier).

According to the invention, it is also possible to change the ratio of the thread thickness from core to leno warp threads in order to increase or maximize the weft density. This results in a tissue surface determined by the undulating weft yarn with its corresponding advantages. Finally, with another inventive development of the invention, it is possible to create a fabric which, in the weft direction, has alternating regions lying behind one another in canvas and leno weaves. This advantageously makes it possible to produce a sliding filter fabric described in EP 0 477 521 B1 (PHP) for use in side panels in passenger bags (windowing technology).

Advantageously, inventive fabrics have the peculiarity that the steherund canvas binding threads have the same denier, in particular dtex 235, and the leno threads a lower denier, in particular dtex 110. This results in a balanced and space-saving, fulfilling all requirements surface fabric. A fabric according to the invention with carbonizable weft threads having a denier of 1220 dtex is particularly advantageous in that this construction permits a special surface suitable for carbonization with simultaneous symmetry of the supporting basic structure of the fabric.

In a further particularly advantageous embodiment of the fabric according to the invention, this is characterized by additional weft threads which have additional heat-protection properties (eg by using carbonizable threads). - A -

In a particularly advantageous embodiment of the fabric according to the invention this is characterized by a basis weight of less than 180g / m ² , a thread density warp / weft less / equal to 220/220 / dm, a maximum tensile force greater than / equal to 2500N / 5cm and a Kammausziehkraft greater / equal 200N.

In a further advantageous embodiment of the sheet according to the invention this is characterized in that the fabric grid is a symmetrical fabric grid. This can positively influence the carrier function during coating and / or lamination.

Finally, the object according to the invention is achieved by an airbag for passenger restraint systems for vehicles by water, by land, in the air and in space, which is produced by a fabric according to one of the above-described advantageous embodiments of a woven textile fabric according to the invention.

For a better understanding of the invention, this will be briefly described below with reference to some embodiments with the aid of drawings.

Fig. 1 shows a schematic view of an embodiment of a sheet according to the invention as a simple Dreheripstop.

Fig. 2 shows a schematic view of another exemplary embodiment of the sheet according to the invention as a reinforced Dreherripstop.

Fig. 3 shows a schematic view of a hybrid rotary fabric according to the invention.

Fig. 4 shows a schematic view of the fabric of FIG. 3 according to the section

FROM.

FIG. 5 shows a schematic view of a carbon fiber hybrid hybrid fabric with embroidery stitching in section. FIG.

Fig. 1 shows a simple Dreherripstopgewebe with Steherfäden 1, leno thread 2 and weft threads 3. The exemplary fabric shown here according to the invention has the following thread sequence: A ground thread 1 from a (not shown) warp beam I, a leno thread of a warp beam (not shown) II, Rietlücke 5, seven warp threads as plain weave of a (not shown) warp beam II (area 4) and so on. The shot sequence is 1/1 linear. In an exemplary embodiment shown herein, the uprights and canvas binding threads have the same denier, e.g. B. dtex 235. A leno warp 2 shown here, hardened on the warp beam II (same incorporation) has a lower titer, z. B. dtex 110. The weft thread 3 and the canvas chain of the area 4 have dtex 235. As can be seen clearly from FIG. 1, the ground thread 1 is exclusively in the shallow fold, while the leno thread 2 mutually bonds in the high shed. It can be clearly seen that the ratio of leno weaves to plain weaves is less than 1 and here exactly 1/7. Due to the configuration of the sheet according to the invention described here, the slip resistance (Kammausziehkraft) is improved. In the warp direction, the weft threads on each eighth warp thread 1 (standing thread) are additionally bound by the leno thread 2. In the weft direction (transverse to the plane of the drawing) the leno threads 2 stop the shifting of the plain weave warp threads (area 4). The tear propagation force in the weft direction is improved by the integrated leno threads 2.

Fig. 2 shows schematically greatly simplified a reinforced Dreherripstopgewebe. In order to further improve a thinner airbag fabric in the specification features of comb pull-out force and tear propagation force, the reinforced ripstop shown here is proposed. It can be seen again on both sides of the representation of the ground thread 1, which is fixed by the leno thread 2. In contrast to the embodiment shown in FIG. 1, the sheet shown here has a reporting double weft 13, which is woven rapportwise in the canvas base fabric 14. The yarn sequence shown here and the yarn thicknesses correspond to the conditions according to the fabric of FIG. 1. The firing sequence is six times 1/1-shot and once 2/1-shot (double shot). By this construction, the tear propagation force in the warp direction is further improved by the double shots. The Kammausziehkraft is the same according to the embodiment of FIG. 1 assume.

3 shows a hybrid leno fabric designed as a coating base fabric with reduced thread density, non-slip and with a lower design strain. It is a symmetrical fabric grid in Halbdreherbindung. In cases where the heat capacity of an uncoated fabric, which is necessarily thin because of the small installation space available, is insufficient, a coating must be carried out, for example, with silicone. A coated conventional linen fabric, e.g. For example, in dtex 235, without ondulation, there is a 5 - 10% eternal design strain. Triggered by the airbag internal pressure in the event of a crash, the design strain will first perforate the coating, and the gas outflow will be unplanned and start earlier. A shown in Fig. 3 hybrid leno fabric has practically only the material expansion of the resulting fabric from standing and weft fabric grid. It can be seen in Fig. 3 ground thread 21, which are fixed by leno thread 22 with the involvement of weft yarns 23.

Fig. 4 shows the sheet according to Fig. 3 according to section A-B. The ground threads 21 and the weft threads 23 form a fabric grid, which without Überdulation, held by the leno threads 22 against sliding over each other. Here, the fabric construction is as follows: The ground yarns 21 are supplied from a warp beam I (not shown), for example, in the thickness dtex 235, while the leno threads 22 are supplied from a warp beam II (not shown) in the thickness dtex 110. The weft yarns 23 are supplied in a thickness of dtex 235. In the embodiment of a fabric according to FIG. 3, the thread density in warp and weft can be influenced by the ratio of the yarn thicknesses of ground thread 21 to leno thread 22, wherein the symmetry of the fabric must always be taken into account. The finer the titer of the leno thread 22 is selected, the denser the mesh fabric can be adjusted. Another parameter here is the warp tension, which can be set differently in terms of process by the two-dimensional weaving (warp beam I and warp beam II). The lowest thread density results when a standing thread and a leno thread have the same titer. In this case (not shown here) results in a classic leno fabric, which in the warp direction has an ondulation (incorporation), whereas the weft straight, d. H. incorporates without or with minimal ondulation.

FIG. 5 shows, by way of example, a hybrid leno fabric with embroidery weft suitable for carbonization (DE 101 15 890 A1, BST Safety Textiles). It is to be carried out according to the invention, a dense Hygienwebe mit Karbonisierfläche eg for the purpose of implementing the invention according to EP 0 893 311 A3 (TRW) for producing a heat-resistant airbag fabric. In the case of a woven textile fabric according to the invention, it is possible to change the ratio of the thread thickness from core to leno thread in order to increase or maximize the weft density. This creates a tissue surface determined by the undulating weft yarn. The sectional construction according to FIG. 5 is intended to illustrate how a special surface suitable for carbonization can be achieved with simultaneous symmetry of the supporting basic construction of the fabric. The fabric exemplified in Fig. 5 is constructed as follows: Chain:

1st warp thread: ground thread 31, dtex 235, 22 thread / cm, from warp beam I

2. Warp thread: leno warp 32, dtex 78, 22 thread / cm, from warp beam II

Shot:

1st weft: weft 33, dtex 235, 22 thread / cm

2. Weft: weft 33Z, dtex 1220, for example viscose, 11 thread / cm

(for example, embroidery)

Shot sequence: 2 threads, dtex 235

1 thread, dtex 1220 (embroidery)

The fabric base construction shown in FIG. 5 consists of 22 by 22 threads, dtex 235, for example polyamide. The leno warp 32 is chosen as fine as possible in order to increase the weft density. Viscose weft 33Z (cellulose) is suitable for carbonization. The additionally registered weft threads 33Z can serve heat protection both over the entire surface and partially as part of the weft repeat and increase the resistance of the fabric to thermal stress.

Claims

A woven fabric for use as an airbag fabric, characterized by leno weaves, and a fabric grid composed of upright warp yarns (21) and regular weft yarns (23), which is without undulation, said leno bindings being made such that by said leno yarns (22), which have a lower denier than the upright warp yarns (21) and the weft yarns (23), the upright warp yarns (21) and the regular weft yarns (23) are held on top of each other and connected.

2. A fabric according to claim 1, characterized by additional carbonizable weft yarns (33Z), in particular viscose yarns whose titer is higher than the denier of the regular weft yarn (33).

A sheet according to claim 1 or 2, characterized in that the denier of the additional weft yarn (33Z) is substantially higher than the denier of the regular weft yarns (33).

4. A sheet according to claim 1, 2 or 3, characterized by in the weft direction alternating areas in screen and leno bindings.

5. Sheet material according to claim 4, characterized in that the uprights and linen binding threads the same denier, in particular dtex 235 and the leno threads a contrast lower titer, in particular dtex 110 have.

6. A fabric according to any one of the preceding claims, characterized by carbonizable weft yarn with a titer of dtex 1220th

7. The sheet according to any one of the preceding claims, characterized by additional weft threads (33Z), which have additional heat protection properties.

8. A sheet according to any one of the preceding claims, characterized by a basis weight of less than 180g / m ² , a thread density warp / weft less than / 220/220 / dm, a maximum tensile force equal to or greater 2500N / 5cm and a Kammausziehkraft greater than or equal to 200N ,

9. A fabric according to any one of claims 3 to 8, characterized by linen and leno weaves, wherein the ratio of leno weaves to plain weaves is less than 1.

10. The sheet material according to claim 9, characterized in that the ratio of leno weaves to plain weaves is 1 to 7.

11. The sheet according to any one of claims 3 to 10, characterized in that the ratio of double or multiple weft thread (13) to single weft thread (3) is less than 1.

12. Sheet material according to one of the preceding claims, characterized in that the fabric grid is a symmetrical fabric grid.

13. Airbag for vehicle restraint systems for vehicles by water, by land, in the air and in space, characterized by a fabric according to one of the preceding claims.