Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Woven fabric – Including strand which is of specific structural definition
Patent
1999-06-28
2000-11-28
Edwards, Newton
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Woven fabric
Including strand which is of specific structural definition
428397, 428399, D01F 600
Patent
active
061535451
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to industrial woven fabrics, especially for airbags, consisting of a filament yarn comprising coarse and fine thermoplastic filaments and having a yarn linear density between 30 and 1000 dtex, and to a process for producing the filament yarn.
2. Prior Art
Industrial woven fabrics, especially airbag woven fabrics, are produced using filament yarns composed of polyamides or polyesters and having a yarn linear density between about 50-750 denier (56-830 dtex), according to JP-A-01-104848. Such yarns can also consist of mixtures of different raw materials. Air permeability has been reduced in various ways. One way is to coat the woven fabrics with an elastomer. Such woven fabrics are generally stiff, heavy and complicated to produce. Owing to the high production costs, the reduced foldability and the limited recyclability, this solution has not been found to be very suitable. Another proposal is the production of uncoated woven fabrics in a closer weave and/or adapted finishing processes. With regard to foldability and weight, however, these wovens were not satisfactory. Air permeability can also be improved by calendering the woven fabrics, but this has the disadvantage of additional process steps and of impairment to the mechanical properties such as tenacity and tear strength in the warp and weft directions.
The production of a mixed linear density yarn having a yarn linear density of 50 to 800 dtex is also known from EP-A-0 022 065. The yarn, produced using a spinneret having different holes for coarse and fine filaments, is false twist textured and is said to exhibit a spunlike effect. It is intended for loose textile applications. It consists of a core filament group having a relatively coarse linear density and a sheath filament group having a relatively fine linear density, which surrounds the core group, and also not more than two further filaments having a filament linear density between 4.0 and 10 dtex. The spunlike yarn is not suitable for producing woven fabric possessing low air permeability and good tear strength.
Optimization in the direction of lower air permeability on the one hand and good foldability and low weight on the other have hitherto only been possible to a limited extent, since a high tensile strength and a (especially for airbags) high tear strength is not ensured. More particularly, lighter woven constructions exhibit a particularly high loss of tear strength.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a woven fabric which exhibits low air permeability, is light and supple and which nonetheless exhibits improved tensile strength, especially improved tear strength.
It is a further object to provide a process for producing the filament yarn.
This object is achieved according to the invention when the coarse filaments of the filament yarn have a filament linear density of 5 to 14 dtex, especially of 5.5 to 8 dtex, preferably 6 to 8 dtex, and the fine filaments have a filament linear density of 1.5 to 5 dtex, especially 2.5 to 4 dtex, preferably 3 to 4 dtex.
It was surprisingly found that a mixed linear density yarn having a yarn linear density between 30 and 1000 dtex, preferably between 200 and 950 dtex, i.e. a yarn consisting of a mixture of relatively fine and relatively coarse individual filaments, is particularly suitable particularly for the industrial use for airbag woven fabric with regard to the combination of air permeability and hence filtration capability, softness and foldability.
The coarse filaments contribute to improving the tensile strength and hence the tear strength. The fine filaments ensure good foldability and hence lower flexural stiffness and hence better softness and suppleness. These advantages, especially the softness and the suppleness, result in better foldability in the case of both uncoated and coated woven fabrics. The mixture of coarse and fine filaments contributes to a lower air permeability through the arrangement of the indiv
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Hurschler Franz
Lalonde Remi
Edwards Newton
Rhodia Filtec AG
Striker Michael J.
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