Title of Invention	AIRBAG FABRIC
Abstract	Woven fabric for airbags with warp and weft yarns, the weft yarns in the fabric being respectively formed, at least predominantly, by at least two yarns extending next to one another, characterized in that at least one of the yarns extending next to one another is an intermingled multifilament yarn, some of the filaments of the multifilament yarn being intermingled with some of the filaments of the neighbouring yarns. (DE) Gewebe für Airbags mit Kett- und Schussgarnen, wobei zumindest überwiegend die Schussgarne im Gewebe jeweils aus mindestens zwei nebeneinander verlaufenden Garnen gebildet sind, dadurch gekennzeichnet, dass mindestens eines der nebeneinander verlaufenden Garne ein verwirbeltes Multifilamentgarn ist, wobei einige der Filamente des Multifilamentgarns mit einigen Filamenten der benachbarten Garne verwirbelt sind.

Title of Invention

AIRBAG FABRIC

Abstract

Woven fabric for airbags with warp and weft yarns, the weft yarns in the fabric being respectively formed, at least predominantly, by at least two yarns extending next to one another, characterized in that at least one of the yarns extending next to one another is an intermingled multifilament yarn, some of the filaments of the multifilament yarn being intermingled with some of the filaments of the neighbouring yarns. (DE) Gewebe für Airbags mit Kett- und Schussgarnen, wobei zumindest überwiegend die Schussgarne im Gewebe jeweils aus mindestens zwei nebeneinander verlaufenden Garnen gebildet sind, dadurch gekennzeichnet, dass mindestens eines der nebeneinander verlaufenden Garne ein verwirbeltes Multifilamentgarn ist, wobei einige der Filamente des Multifilamentgarns mit einigen Filamenten der benachbarten Garne verwirbelt sind.

Full Text	Airbag Fabric Description The invention relates to an airbag fabric with warp and weft yams, at least most of the weft yarns in the fabric each comprising at least two contiguous yarns. A fabric of this type is known from, for example, DE 198 07 572 A1. It is generally known that simultaneous insertion of two or more weft yarns into the same shed results in the inserted weft yarns having different lengths and/or different yarn tension, so that simultaneous insertion of the weft yarns gives rise to highly inhomogeneous fabrics that are not suitable for airbag production. DE 198 07 572 A1 therefore recommends that the weft yarns be inserted in succession into the same shed in the production of airbag fabrics. If the weft yams are inserted into the shed in succession, the weaving efficiency is naturally reduced. The object of the present invention is to provide an economically produced airbag fabric with warp and weft yams in which at least most of the weft yarns comprise at least two contiguous yarns. This object is achieved by an airbag fabric with warp and weft yarns in which at least most of the weft yarns comprise at least two contiguous yarns, distinguished in that at least one of the contiguous yarns is an intermingled multifilament yarn, some filaments of the multifilament yarn being intermingled with some filaments of the yams adjacent to it. Because at least one weft yarn is an intermingled multifilament yarn, it is ensured that contiguous weft yams remain as, and retain the character of, discrete yarns. Because individual filaments of a weft yarn are intermingled with individual filaments of the weft yarn adjacent to it, such yams can now be jointly and simultaneously inserted into the shed. It is therefore clear that the fabric of the invention can be produced more economically. The fabric of the invention can be produced by, for example, using as weft threads yarns that have previously been intermingled with one another, of which at least one must be an already intermingled yarn. It is considerably more cost effective to use the process described in DE 196 53 028 C1, where the weft yam, prior to intermediate storage, is intermingled with an intermingling unit. To obtain the fabric of the invention, it is necessary merely to feed simultaneously into the intermingling unit described in DE 196 53 028 CI those yarns of the fabric that are to be inserted alongside one another into the shed. This intermingling ensures that the contiguous yarns have at least approximately the same length and the same tension after insertion into the shed, and that, because at least one of these yarns had previously been intermingled, the yarns in the finished fabric are still recognisable as distinct, contiguous yarns, so that the fabrics are comparable with those in which adjacent weft threads have been inserted in succession. The fabrics of the invention are however distinguished from known fabrics in that at least some filaments of the contiguous weft yarns are intermingled with one another. The object of the invention is also achieved by a fabric having at least one upper and at least one lower fabric, the upper and lower fabrics being intenA/oven in selected regions to form a single fabric, wherein at least most of the weft threads in the upper and lower fabrics comprise at least two contiguous yarns, characterised in that at least one of the contiguous yarns is an intermingled multifilament yarn, some filaments of the multifilament yarn being intermingled with some filaments of the yarns adjacent to it. These fabrics also have the advantages described above. In the fabric of the invention it has proved particularly advantageous if 5 to 25% of the filaments of each of the contiguous yarns are intermingled with one another. Extensive trials have shown that for intermingling in which fewer than 5% of the filaments of one yarn are intermingled with fewer than 5% of the filaments of a second yarn, the cohesion of the two yarns is insufficient for both yarns to be inserted jointly into the shed. If more than 25% of the filaments of the contiguous yarns are intermingled, the yarns lose their discrete identity as the number of intermingled filaments of contiguous yarns increases. For the fabric of the invention, it is particularly advantageous if ail contiguous weft yarns are intermingled multifilament yarns. The weft yarns that are used and intermingled can all be of the same material, such as a polyamide or a polyester However, for fine tuning of specific properties in the fabric of the invention it can also be advantageous to intermingle yarns of different materials with one other. The fabrics of the invention are distinguished particularly in that the warp and/or weft yarns have a linear density of 235 to 700 dtex and/or in that the individual filaments of the warp and/or weft yarns have a linear density not exceeding 5 dtex. Yarns such as are described in, for example, EP 0 738 793 A1 are particularly suitable for producing the fabric of the invention. Airbag Fabric Claims 1. An airbag fabric with warp and weft yarns in which at least most of the weft yarns in the fabric comprise at least two contiguous yarns, characterised in that at least one of the contiguous yarns is an intermingled multifilament yarn, some filaments of the multifilament yarn being intermingled with some filaments of the yarns adjacent to it. 2. Fabric having at least one upper and at least one lower fabric, the upper and lower fabrics being interwoven in selected regions to form a single fabric, wherein at least most of the weft threads in the upper and lower fabrics comprise at least two contiguous yarns, characterised in that at least one of the contiguous yarns is an intermingled multifilament yarn, some filaments of the multifilament yarn being intermingled with some filaments of the yarns adjacent to it. 3. Fabric according to Claim 1 or 2, characterised in that 5 to 25% of the filaments of each of the contiguous yarns are intermingled with one another. 4. Fabric according to Claims 1 to 3, characterised in that all contiguous weft yarns are intermingled multifilament yarns. 5. Fabric according to one or more of Claims 1 to 4, characterised in that warp and/or weft yarns have a linear density of 235 to 700 dtex. 6. Fabric according to one or more of Claims 1 to 5, characterised in that the individual filaments of the warp and/or weft yarns have a linear density not exceeding 5 dtex. 7. Fabric according to one or more of Claims 1 to 5, characterised in that the warp yarns as well as each of the contiguous weft yarns have the same linear density.

Full Text

Airbag Fabric
Description
The invention relates to an airbag fabric with warp and weft yams, at least most of the weft yarns in the fabric each comprising at least two contiguous yarns.
A fabric of this type is known from, for example, DE 198 07 572 A1. It is generally known that simultaneous insertion of two or more weft yarns into the same shed results in the inserted weft yarns having different lengths and/or different yarn tension, so that simultaneous insertion of the weft yarns gives rise to highly inhomogeneous fabrics that are not suitable for airbag production. DE 198 07 572 A1 therefore recommends that the weft yarns be inserted in succession into the same shed in the production of airbag fabrics. If the weft yams are inserted into the shed in succession, the weaving efficiency is naturally reduced.
The object of the present invention is to provide an economically produced airbag fabric with warp and weft yams in which at least most of the weft yarns comprise at least two contiguous yarns.
This object is achieved by an airbag fabric with warp and weft yarns in which at least most of the weft yarns comprise at least two contiguous yarns, distinguished in that at least one of the contiguous yarns is an intermingled multifilament yarn, some filaments of the multifilament yarn being intermingled with some filaments of the yams adjacent to it.

Because at least one weft yarn is an intermingled multifilament yarn, it is ensured that contiguous weft yams remain as, and retain the character of, discrete yarns. Because individual filaments of a weft yarn are intermingled with individual filaments of the weft yarn adjacent to it, such yams can now be jointly and simultaneously inserted into the shed. It is therefore clear that the fabric of the invention can be produced more economically.
The fabric of the invention can be produced by, for example, using as weft threads yarns that have previously been intermingled with one another, of which at least one must be an already intermingled yarn. It is considerably more cost effective to use the process described in DE 196 53 028 C1, where the weft yam, prior to intermediate storage, is intermingled with an intermingling unit. To obtain the fabric of the invention, it is necessary merely to feed simultaneously into the intermingling unit described in DE 196 53 028 CI those yarns of the fabric that are to be inserted alongside one another into the shed. This intermingling ensures that the contiguous yarns have at least approximately the same length and the same tension after insertion into the shed, and that, because at least one of these yarns had previously been intermingled, the yarns in the finished fabric are still recognisable as distinct, contiguous yarns, so that the fabrics are comparable with those in which adjacent weft threads have been inserted in succession. The fabrics of the invention are however distinguished from known fabrics in that at least some filaments of the contiguous weft yarns are intermingled with one another.
The object of the invention is also achieved by a fabric having at least one upper and at least one lower fabric, the upper and lower fabrics being intenA/oven in selected regions to form a single fabric, wherein at least most of the weft threads in the upper and lower fabrics comprise at least two contiguous yarns, characterised in that at least one of the contiguous yarns is an intermingled multifilament yarn, some filaments of the multifilament yarn being intermingled with

some filaments of the yarns adjacent to it. These fabrics also have the advantages described above.
In the fabric of the invention it has proved particularly advantageous if 5 to 25% of the filaments of each of the contiguous yarns are intermingled with one another. Extensive trials have shown that for intermingling in which fewer than 5% of the filaments of one yarn are intermingled with fewer than 5% of the filaments of a second yarn, the cohesion of the two yarns is insufficient for both yarns to be inserted jointly into the shed. If more than 25% of the filaments of the contiguous yarns are intermingled, the yarns lose their discrete identity as the number of intermingled filaments of contiguous yarns increases.
For the fabric of the invention, it is particularly advantageous if ail contiguous weft yarns are intermingled multifilament yarns. The weft yarns that are used and intermingled can all be of the same material, such as a polyamide or a polyester However, for fine tuning of specific properties in the fabric of the invention it can also be advantageous to intermingle yarns of different materials with one other.
The fabrics of the invention are distinguished particularly in that the warp and/or weft yarns have a linear density of 235 to 700 dtex and/or in that the individual filaments of the warp and/or weft yarns have a linear density not exceeding 5 dtex. Yarns such as are described in, for example, EP 0 738 793 A1 are particularly suitable for producing the fabric of the invention.

Airbag Fabric
Claims
1. An airbag fabric with warp and weft yarns in which at least most of the weft yarns in the fabric comprise at least two contiguous yarns, characterised in that at least one of the contiguous yarns is an intermingled multifilament yarn, some filaments of the multifilament yarn being intermingled with some filaments of the yarns adjacent to it.
2. Fabric having at least one upper and at least one lower fabric, the upper and lower fabrics being interwoven in selected regions to form a single fabric, wherein at least most of the weft threads in the upper and lower fabrics comprise at least two contiguous yarns, characterised in that at least one of the contiguous yarns is an intermingled multifilament yarn, some filaments of the multifilament yarn being intermingled with some filaments of the yarns adjacent to it.
3. Fabric according to Claim 1 or 2, characterised in that 5 to 25% of the filaments of each of the contiguous yarns are intermingled with one another.
4. Fabric according to Claims 1 to 3, characterised in that all contiguous weft yarns are intermingled multifilament yarns.
5. Fabric according to one or more of Claims 1 to 4, characterised in that warp and/or weft yarns have a linear density of 235 to 700 dtex.

6. Fabric according to one or more of Claims 1 to 5, characterised in that the
individual filaments of the warp and/or weft yarns have a linear density not
exceeding 5 dtex.
7. Fabric according to one or more of Claims 1 to 5, characterised in that the warp
yarns as well as each of the contiguous weft yarns have the same linear
density.

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Patent Number

272981

Indian Patent Application Number

5519/CHENP/2007

PG Journal Number

20/2016

Publication Date

13-May-2016

Grant Date

06-May-2016

Date of Filing

30-Nov-2007

Name of Patentee

POLYAMIDE HIGH PERFORMANCE GMBH

Applicant Address

KASINOSTRASSE 19-21, D-42103, WUPPERTAL, GERMANY.

Inventors:

#	Inventor's Name	Inventor's Address
1	KOHNEN, RALF	ENNERDALE DRIVE 78, CHESHIRE, CONGLETON CW12 4FL

PCT International Classification Number

D03D 1/02

PCT International Application Number

PCT/EP2006/004527

PCT International Filing date

2006-05-13

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	05011877.7	2005-06-02	EUROPEAN UNION