EP2503038B1 - Tissu pour airbag et procédé de fabrication du tissu - Google Patents

Tissu pour airbag et procédé de fabrication du tissu Download PDF

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Publication number
EP2503038B1
EP2503038B1 EP11169951.8A EP11169951A EP2503038B1 EP 2503038 B1 EP2503038 B1 EP 2503038B1 EP 11169951 A EP11169951 A EP 11169951A EP 2503038 B1 EP2503038 B1 EP 2503038B1
Authority
EP
European Patent Office
Prior art keywords
yarn
filaments
air
fabric
warp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11169951.8A
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German (de)
English (en)
Other versions
EP2503038A1 (fr
Inventor
Hugh Finn
Ralf Koehnen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Autoliv Development AB
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Autoliv Development AB
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Publication date
Application filed by Autoliv Development AB filed Critical Autoliv Development AB
Priority to EP11169951.8A priority Critical patent/EP2503038B1/fr
Publication of EP2503038A1 publication Critical patent/EP2503038A1/fr
Application granted granted Critical
Publication of EP2503038B1 publication Critical patent/EP2503038B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/02—Inflatable articles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/58—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads characterised by the coefficients of friction
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M23/00—Treatment of fibres, threads, yarns, fabrics or fibrous goods made from such materials, characterised by the process
    • D06M23/08—Processes in which the treating agent is applied in powder or granular form

Definitions

  • THIS INVENTION relates to a method for manufacturing an air-bag, and in particular concerns a method for weaving a fabric for use in the production of air-bags.
  • vehicle air-bags are generally formed from woven nylon fabric.
  • the fabric is typically manufactured by drawing a number of parallel warp yarns from a reel, and weaving weft yarns across the warp yarns, generally at right angles thereto.
  • a first weft yarn will be woven into the warp yarn so that it passes over and under alternate warp yarns.
  • the next weft yarn will be introduced so that it passes over the warp yarns that the first weft yarn passed under, and vice versa.
  • the warp yarns are subject to friction and abrasion as they pass through the loom, through coming into contact with neighbouring yarns and against components of the loom. It is therefore necessary to protect the warp yarns from damage during the weaving process.
  • each warp yarn from a relatively large number of filaments (for example, around 140 filaments). These filaments are extruded and gathered together to form the yarn, and the yarn is nipped at periodic intervals to form points of entanglement. These periodic entanglement points may be provided at a spacing of around 20 to 30 per metre of yarn.
  • the warp yarns then have coating applied to protect them during the weaving process.
  • This coating is known as the "size”, and is applied by passing the yarn through a size bath.
  • the size may form around 0.5 to 2% by weight of the finished yarn.
  • the size is removed from the fabric during a scouring process, in which chemicals are applied to the fabric to dissolve the size and wash the size away.
  • US5236775 and EP0442373 disclose an airbag fabric made of a synthetic yarn.
  • the synthetic yarn is a high-tenacity polyester filament yarn having filaments of less than 4 dtex and a yarn count within the range from 250 to 550 dtex.
  • the fabric itself in contrast to the conventional polyamide fabrics, is uncoated and is preferably made by weaving unsized yarns.
  • the fabric need not be calendered. It has been found that this fabric of fine-filament high-tenacity polyester yarn, although uncoated, does meet the airbag fabric requirements such as low air permeability, low fabric weight, low fabric thickness and high fabric strength.
  • EP0095537 discloses a high twist polyester multifilament yarn having a twist of a twist multiplier K within a range between 15,000 and 25,000, made from polyester filaments consisting essentially of a copolymer of two or more monomers selected from the group consisting of ethylene terephthalate, trimethylene terephthalate and tetramethylene terephthalate and/or a blend of two or more polymers of the respective monomers and having a breaking elongation of not more than 60% and shrinkage in boiling water of not more than 6%.
  • a woven or knitted crepe fabric obtained by employing such a high twist yarn has a desirable pebble configuration.
  • US2245641 discloses a composite yarn and a fabric made from the composite yarn.
  • the yarn is twisted by at least 10-12 turns per inch (per 2.5 cm).
  • US5183703 discloses belt strap for safety belts which is to have outer surfaces of as low friction as possible so that it can run through the safety belt system with as little friction as possible.
  • the warp threads which are woven into the belt strap, have filaments of at least 15 dtex, particularly 17 dtex.
  • the warp threads are, in one embodiment, untwined and tangled at certain points with compressed air, whereby the tangled points can be spaced from one another by 5 to 15 cm. In another embodiment the warp threads are twined only slightly, namely with 30 to 50 twists per metre thread length.
  • JPH06184856 discloses a conventional low air-permeable woven fabric and its production.
  • an air-bag as defined in claim 1 hereinafter.
  • a yarn 1 which is suitable for use as a warp yarn in embodiments of the present invention.
  • the yarn 1 is formed from a number of individual filaments 2 which are twisted together to form the yarn 1.
  • Either "S" or "Z"-twists i.e. right-or left-handed twists) may be used to form the yarn 1.
  • the yarn 1 consists of a bundle of around 96 to 120 filaments 2.
  • the number of filaments 2 in the yarn 1 may be as high as 180 or even higher, however.
  • the degree of twist of the yarns 2 is between around 40 and 200 turns per metre of the yarn 1. If the degree of twist is less than around 40 turns per metre, it has been found that there is generally insufficient consolidation of the filaments 2 that make up the yarn 1.
  • the degree of twist is greater than around 200 turns per metre, it has been found that the resulting yarn becomes too heavy, stiff and unwieldy to be woven effectively into a fabric. In addition the high level of twist will reduce the throughput of the twisting machine, thus increasing the cost.
  • the filaments 2 forming the yarn are extruded in the normal (or any suitable) manner, and are nipped at periodic intervals to form entanglement points.
  • the bundle of filaments is then sent to a twisting machine, which twists the filaments together to form the yarn 1.
  • the yarn 1 may be passed through a size bath so that a suitable finish or lubricant can be applied to the yarn 1.
  • the finished yarn 1 is then wound on to a bobbin, which can then be used to transport the yarn 1 to its destination.
  • the yarn 1 is then used as warp yarns in a weaving process to form a fabric, as discussed above.
  • Figure 2 shows a close-up view of a region of woven fabric 3 embodying the present invention.
  • Figure 2 is a schematic figure and the size and spacing of the yarns forming the fabric 3 is exaggerated for the purpose of clarity.
  • the fabric 3 is formed from a series of warp yarns 4, which run vertically in figure 2 , and weft yarns 5, which run horizontally in figure 2 .
  • each warp yarn 4 passes alternately over and under each alternate weft yarn 5 that is encountered along the length of the warp yarn 4.
  • each weft yarn 5 passes alternately over and under each warp yarn 4 that is encountered along the length of the weft yarn 5.
  • Each warp yarn 4 is formed from a bundle of twisted filaments, as shown in figure 1 .
  • Each weft yarn 5 is substantially untwisted, comprising a bundle of filaments which are generally parallel to one another, and have a degree of twist which is less than about 5 turns per metre.
  • Fabrics embodying the present invention will have warp yarns that are more robust, in which the filaments forming the warp yarns hold together more readily, and are more resistant to damage through friction and abrasion during the weaving process. This means that a reduced amount of size, or no size, may be applied to the warp yarns prior to the weaving process beginning, thus reducing the cost of the finished fabric, both in the amount of size that has to be added to the warp yarns prior to weaving and also in the degree of scouring that needs to be performed to remove the size from the fabric after weaving has been completed.
  • Polyester is stiffer than nylon, and periodic entanglements cannot be applied to polyester as effectively. Periodic entanglements can generally only be applied to polyester yarns with a frequency of around 9 to 20 entanglements per metre. Also, because the filaments forming the yarn are stiffer, the entanglement points do not bind the filaments together as reliably.
  • the size that is used for coating nylon yarns can generally not be applied directly to polyester yarns.
  • the size required to coat polyester yarns is more expensive, and present scouring machines are not configured to remove this size effectively. It is therefore desirable to use as little size as possible, or no size, and as discussed above a reduction in the required amount of size can be achieved by forming the warp yarns from twisted filaments.
  • the weft yarns are substantially untwisted. This is because the weft yarns are, in general, not subject to friction and/or abrasion to the same degree as warp yarns during the weaving process, and are not as prone to breakage of filaments. The twisting stage, which inevitably increases the cost of yarn, need therefore not be applied to the weft yarns.
  • weft yarns do not have any size applied thereto.
  • the weft yarns may have a relatively small amount of finish or lubricant, for instance around 0.5% of "spin finish" from the manufacturing stage.
  • one or both of the warp and weft yarns are formed to have a density of around 400 to 600 decitex.
  • the decitex may be considerably higher, for instance up to around 1800 decitex, or may be lower, for instance around 167 decitex.
  • fabrics embodying the present invention will find utility in various forms of vehicle air-bag, including (but not limited to) internal passenger protection air-bags and external pedestrian protection air-bags.
  • Embodiments of the invention provide air-bag modules including air-bags formed entirely or partially from fabrics as described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Woven Fabrics (AREA)
  • Air Bags (AREA)

Claims (8)

  1. Coussin gonflable de sécurité formé à partir d'un tissu (3) qui est formé à partir de fils de chaîne et de trame entrelacés (1, 4 ; 5) qui sont agencés pour être sensiblement perpendiculaires les uns aux autres, dans lequel les fils de chaîne (1, 4) sont formés à partir de multiples filaments qui sont torsadés ensemble pour former les fils de chaîne (1, 4), avec un degré de torsion d'environ 40 tours par mètre, caractérisé en ce que les fils de trame (5) sont sensiblement non torsadés, et dans lequel le degré de torsion des fils de trame (5) est inférieur à environ 5 tours par mètre.
  2. Coussin gonflable de sécurité selon la revendication 1, dans lequel chaque fil de chaîne successif (1, 4) est formé à partir de filaments qui sont torsadés ensemble.
  3. Coussin gonflable de sécurité selon la revendication 1 ou la revendication 2, dans lequel les fils de chaîne (1, 4) ont des points d'enchevêtrement périodiques, au niveau desquels les filaments formant les fils (1, 4) sont enchevêtrés ensemble.
  4. Coussin gonflable de sécurité selon la revendication 3, dans lequel moins d'environ 20 points d'enchevêtrement par mètre de fil de chaîne (1, 4) sont formés.
  5. Procédé de formation d'un coussin gonflable de sécurité, comprenant :
    la formation de fils de chaîne (1, 4) par :
    la fourniture d'un faisceau de filaments (2) ;
    le rassemblement du faisceau de filaments (2) ; et
    la torsion des filaments (2) ensemble, selon un degré de torsion d'environ 40 tours par mètre, pour former le fil (1, 4) ;
    la fourniture d'une pluralité de fils de trame (5) qui sont sensiblement non torsadés, dans lequel le degré de torsion des fils de trame (5) est inférieur à environ 5 tours par mètre ;
    le tissage des fils de chaîne et de trame (1, 4 ; 5) ensemble pour former un tissu (3), de sorte que les fils de chaîne et de trame (1, 4 ; 5) sont agencés pour être sensiblement perpendiculaires les uns aux autres ; et
    la formation d'un coussin gonflable de sécurité à partir du tissu (3).
  6. Procédé selon la revendication 5, comprenant en outre l'étape d'application de points d'enchevêtrement périodiques au faisceau de filaments (2), avant l'étape de torsion, les filaments (2) étant enchevêtrés les uns avec les autres au niveau des points d'enchevêtrement.
  7. Module de coussin gonflable de sécurité comprenant un coussin gonflable de sécurité selon l'une quelconque des revendications 1 à 4.
  8. Véhicule comprenant un module de coussin gonflable de sécurité selon la revendication 7
EP11169951.8A 2011-03-23 2011-06-15 Tissu pour airbag et procédé de fabrication du tissu Active EP2503038B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11169951.8A EP2503038B1 (fr) 2011-03-23 2011-06-15 Tissu pour airbag et procédé de fabrication du tissu

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11159477.6A EP2503037B1 (fr) 2011-03-23 2011-03-23 Étoffe pour une utilisation dans la fabrication d'un airbag gonflable
EP11169951.8A EP2503038B1 (fr) 2011-03-23 2011-06-15 Tissu pour airbag et procédé de fabrication du tissu

Publications (2)

Publication Number Publication Date
EP2503038A1 EP2503038A1 (fr) 2012-09-26
EP2503038B1 true EP2503038B1 (fr) 2022-10-26

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP11159477.6A Active EP2503037B1 (fr) 2011-03-23 2011-03-23 Étoffe pour une utilisation dans la fabrication d'un airbag gonflable
EP11169951.8A Active EP2503038B1 (fr) 2011-03-23 2011-06-15 Tissu pour airbag et procédé de fabrication du tissu

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Application Number Title Priority Date Filing Date
EP11159477.6A Active EP2503037B1 (fr) 2011-03-23 2011-03-23 Étoffe pour une utilisation dans la fabrication d'un airbag gonflable

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2245641A (en) * 1938-11-09 1941-06-17 Celanese Corp Composite yarn and fabric made of or containing such yarn
US5183703A (en) * 1989-06-30 1993-02-02 Johann Berger Belt strap for safety belts
JPH06184856A (ja) * 1992-06-02 1994-07-05 Kanebo Ltd 低通気性織物及びその製造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761346A (en) * 1969-12-29 1973-09-25 Owens Corning Fiberglass Corp Composite linear material and process of making such material
DE3270843D1 (en) * 1982-06-02 1986-06-05 Teijin Ltd High twist polyester multi-filament yarn and fabric made therefrom
JPS6228435A (ja) * 1985-07-23 1987-02-06 中興化成工業株式会社 吸音材
DE4004216A1 (de) * 1990-02-12 1991-08-14 Hoechst Ag Gewebe fuer einen airbag
US5236775A (en) * 1990-02-12 1993-08-17 Hoechst Aktiengesellschaft Fabric for airbag
US6790796B2 (en) * 2001-10-05 2004-09-14 Albany International Corp. Nonwovens forming or conveying fabrics with enhanced surface roughness and texture
AU2003298642A1 (en) * 2002-12-09 2004-06-30 Milliken And Company Treatment of filament yarns to provide spun-like characteristics and yarns and fabrics produced thereby
US20050186873A1 (en) * 2004-02-24 2005-08-25 Milliken & Company Treated textile substrate and method for making a textile substrate
EP2500454B1 (fr) * 2011-03-16 2015-05-13 Autoliv Development AB Etoffe pour une utilisation dans la fabrication d'un airbag gonflable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2245641A (en) * 1938-11-09 1941-06-17 Celanese Corp Composite yarn and fabric made of or containing such yarn
US5183703A (en) * 1989-06-30 1993-02-02 Johann Berger Belt strap for safety belts
JPH06184856A (ja) * 1992-06-02 1994-07-05 Kanebo Ltd 低通気性織物及びその製造方法

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Publication number Publication date
EP2503037A1 (fr) 2012-09-26
EP2503037B1 (fr) 2021-04-28
EP2503038A1 (fr) 2012-09-26

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