EP2687628B1 - Améliorations de ou relatives à un matériau d'airbag - Google Patents

Améliorations de ou relatives à un matériau d'airbag Download PDF

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Publication number
EP2687628B1
EP2687628B1 EP12176952.5A EP12176952A EP2687628B1 EP 2687628 B1 EP2687628 B1 EP 2687628B1 EP 12176952 A EP12176952 A EP 12176952A EP 2687628 B1 EP2687628 B1 EP 2687628B1
Authority
EP
European Patent Office
Prior art keywords
yarns
recycled
air
bag
new
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
EP12176952.5A
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German (de)
English (en)
Other versions
EP2687628A1 (fr
Inventor
David Stow
Hugh Finn
Jean Francois Prat
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
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Priority to EP12176952.5A priority Critical patent/EP2687628B1/fr
Publication of EP2687628A1 publication Critical patent/EP2687628A1/fr
Application granted granted Critical
Publication of EP2687628B1 publication Critical patent/EP2687628B1/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

Definitions

  • air-bags are generally formed from polymer materials, such as nylon or polyester, which are manufactured directly from new, "virgin” sources. It is recognised that such materials will have the best mechanical characteristics and reliability. However, as those skilled in the art will know, these sources are invariably derived from oil. Manufacturers of such air-bags are therefore at the mercy of significant and unpredictable price fluctuations. At the same time, all industries are under pressure to reduce the quantity of oil that is consumed, since oil is a finite resource, and the search for, and extraction of, new sources of oil can cause many different types of harm to the Earth's environment.
  • US2012/015573 discloses a coating fabric for airbags where an elastomer is coated to at least one side of textile constituted from synthetic fiber filament, which is characterized in that the coating weight of the resin is as small as 10 to 20 g/m 2 and an average resin thickness of the head top in the textile surface is 4.0 ⁇ m to 12.0 ⁇ m in both directions of warp and weft and that the average value of burning speed measured according to FMVSS 302 is not more than 60 mm/min in both directions of warp and weft and the maximum value thereof is not more than 1.2-fold to the average value in both directions of warp and weft.
  • US5865464 discloses an uncoated hollow weave air bag composed of a hollow weave fabric in which the circumferential periphery of the hollow part shaping the bag body is joined by a band of one layer bind weave, the hollow weave air bag satisfying the conditions [1] - [3] below: [1] the weave constituting cloth A forming the hollow part of the bag body is a plain weave and the cover factor of cloth A being 2000 ⁇ K ⁇ 2300, [2] the weave constituting cloth B which is the other cloth forming said hollow part, and the ratio of gas permeability at a pressure of 19.6 kpa for cloth B (qB) to that of cloth A (qA), qB/qA satisfies a relation 1 ⁇ qB/qA ⁇ 2.2, [3] an opening for attachment of the gas generator is provided in part of cloth B.
  • the air bag can be produced in a simplified manufacturing process and is light weight, less bulky and excellent in its safe inflation characteristics.
  • one aspect of the present invention provides a fabric for use in forming a vehicle air-bag, the fabric being formed from a plurality of yarns, at least some of the yarns being formed partially or entirely from recycled polymer material, wherein the yarns comprise first and second sets of yarns which are arranged substantially at right angles to one another, wherein the proportion of recycled material in the first set of yarns is greater than that in the second set of yarns.
  • the yarns are elongate yarns.
  • some of the yarns are formed substantially from recycled polymer material.
  • At least some of the yarns are formed from material which is a blend of new polymer material and recycled polymer material.
  • the fabric comprises a mixture of new yarns and blended yarns.
  • some of the yarns are formed substantially entirely from material derived from new polymer material.
  • the first set of yarns is formed substantially entirely from new polymer sources, and the second set of yarns is formed substantially entirely from recycled polymer sources.
  • the proportion of new and recycled yarns is around 50/50.
  • the proportion of new and recycled yarns is between 50/50 and 20/80
  • the proportion of new and recycled yarns is between 50/50 and 80/20.
  • the fabric comprises a mixture of blended yarns and recycled yarns.
  • the yarns of the first set of yarns are blended yarns, having a first mix of new and recycled material
  • the yarns of the second set of yarns are blended yarns, having a separate second different mix of new and recycled material.
  • Another aspect of the present invention provides an air-bag formed from a fabric according to any of the above.
  • a further aspect of the present invention provides a method of manufacturing an air-bag, comprising the steps of: providing a plurality of first yarns and a plurality of second yarns, the proportion of recycled polymeric material in the second yarns being greater than the proportion of recycled polymeric material in the first yarns; selecting a first region or yarn direction of the air-bag, and a second region or yarn direction of the air-bag, wherein the first region or yarn direction is expected to be exposed, during deployment of the air-bag, to greater forces than the second region or yarn direction; and forming the air-bag so that the second region comprises the second yarns, or the second yarns lie in the second yarn direction of the air-bag and the first region comprises the first yarns, or the first yarns lie in the first yarn direction of the air-bag.
  • figure 1 shows a schematic view of a fabric embodying the present invention.
  • recycled polymer material may perform reasonably well in injection moulding
  • recycled polymer materials generally perform less well in extrusion procedures, such as those used to form the yarns from which air-bag fabrics are woven.
  • the fabric 1 includes a plurality of warp fibres or yarns 2, which are substantially parallel with one another and are interwoven with a plurality of weft fibres or yarns 3.
  • the fibres 2,3 are interwoven so that, as each warp fibre 2 is followed along its length, it passes alternately over and under successive weft fibres 3 that are encountered. Similarly, as each weft fibre 3 is followed along its length, it passes alternately under and over successive warp fibres 2 that are encountered.
  • the warp fibres 2 comprise substantially equal numbers of first warp fibres 2a, which are formed from a polymer material derived from a new or “virgin” polymer source (hereafter referred to as "new polymer materials”), and second warp fibres 2b, which are formed substantially entirely from recycled polymer material.
  • weft fibres 3 also comprise a substantially even mix of first weft fibres 3a, which are formed substantially entirely from new polymer material, and second weft fibres 3b, which are formed substantially entirely from recycled polymer material.
  • the fabric 1 is formed generally from a nylon material.
  • the second warp fibres 2b and the second weft fibres 3b may be formed from pellets of recycled nylon, for instance obtained from recycled items such as mechanical machine parts, bearings and so on.
  • the fabric 1 may be formed substantially from a polyester material.
  • the second fibres 2b and the second weft fibres 3b may be formed from, for example, material recovered from recycling PET bottles and the like.
  • the proportion of fibres derived from new polymer material may need be as high as 80%, with the remaining 20% of fibres being formed substantially entirely from recycled polymer materials.
  • yarns may be formed from a polymer material which comprises a blend of new material and recycled material.
  • the new and recycled polymer material can be mixed and melted so that the materials are combined and blended together, and the resulting material can then be extruded to form yarns that can be used to weave fabric.
  • fabric may be formed from warp and weft yarns, all of which are formed from blended new and recycled polymeric material.
  • the proportions of the blend are substantially the same in all of the fibres.
  • a fabric may be woven from a mixture of blended fibres and fibres formed substantially entirely from new polymer material.
  • the proportion of new fibres to blended fibres may be around 50%. However, depending upon the proportions of the blend used, and the purpose for which the air-bag is required, the proportion of blended fibres may be as great as 80%, or as little as 20%.
  • a fabric may be woven from a combination of blended fibres and fibres which are formed substantially entirely from recycled polymer sources.
  • the strength of such a fabric may be reduced compared to other fabrics disclosed herein, depending on the proportions of the blend that is used to make the blended fibres.
  • fabrics formed in this way may perform acceptably for certain applications.
  • the proportion of blended fibres may be as high as 80%, or as low as 20%.
  • a fabric may be formed from a combination of new fibres, blended fibres and recycled fibres.
  • the proportion of each type of fibre that is used will depend upon the required strength of the fabric, and the proportions of the blend. It is anticipated that the proportion of each type of fibre may be between 10% and 50%. For instance, an example fabric may comprise 10% new fibres, 50% blended fibres and 40% recycled fibres.
  • manufacturers may be provided with three types of fibre, i.e. new fibres, blended fibres having a standard blending proportion and recycled fibres.
  • these yarns can be mixed in the required proportions to achieve the necessary strength, whilst maximising the amount of recycled material used in the fabric, and also balancing the use of the three types of yarn, so that stocks of any particular type of yarn are not depleted disproportionately quickly.
  • a fabric may be formed from at least two different types of blended yarn, with the proportion of blending in each type of yarn being different.
  • a fabric may be formed from a mix of relatively strong blended fibres, comprising 80% of material from new polymer sources and 20% of material from recycled polymer sources, and relatively weak blended fibres, comprising 80% of material from recycled polymer sources and only 20% from new polymer sources.
  • the proportion of strong blended fibres in the mix may be as high as 80%, or as low as 20%.
  • fabrics may be formed from a combination of new fibres, at least two different types of blended fibres, and recycled fibres.
  • the skilled person will, from the discussion set out in this document, be able to establish how to compose a fabric of this type effectively.
  • the mechanical properties of the air-bag in a first region, or in a first direction are of particular importance.
  • the air-bag in the case of an inflatable curtain (IC)-type side air-bag, the air-bag generally unrolls downwardly from the ceiling line of the vehicle, to form an inflated curtain between the interior of the vehicle wall and a vehicle occupant.
  • IC inflatable curtain
  • This type of air-bag is particularly useful in protecting occupants during a side collision or roll-over event.
  • the strength (i.e. tenacity) of the fibres which extend in the forwards-backwards direction of the vehicle is of greater importance than the strength of the fibres which run in the vertical direction.
  • the fibres used to form the weft fibres may be different to those used to form the warp fibres.
  • the proportion of different types of fibres may be different, or the blended materials used in some or all of the fibres may be different.
  • the warp fibres of a fabric may be those which substantially lie in the forward-backward direction of the vehicle, when the air-bag is deployed, and the weft fibres are those that are arranged substantially in the vertical direction. It will be understood that, in this arrangement, the strength of the warp fibres is of greater importance than the that of the weft fibres.
  • the warp fibres may all, or substantially all, be formed from new polymer material, while the weft fibres may comprise a mix of new and recycled fibres, for instance a 50/50 mix.
  • some or all of the warp fibres may be formed from a material which comprises a blend of around 80% of material from new polymer sources, with around 20% of polymer from recycled polymer sources.
  • the weft fibres may comprise a blend which is around 80% of polymer from recycled polymer sources, and only 20% from new polymer sources.
  • the proportion of blended fibres to new fibres and/or the proportion of recycled material that comprises the fibres can influence the mechanical properties of the resulting fabric.
  • the overall proportion of recycled material, per unit weight of the yarns is greater in the warp or weft fibres than in the other of the warp/weft fibres.
  • embodiments of the present invention may provide fabrics which are practical and appropriate for use in forming vehicle air-bags, while helping to reduce costs and/or minimise the unpredictability of costs, and also reducing environmental damage and depletion of fossil resources.

Landscapes

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

Claims (13)

  1. Tissu destiné à la formation d'un coussin gonflable de sécurité pour véhicule, le tissu étant constitué d'une pluralité de fils (2, 3), au moins certains des fils (2b, 3b) étant constitués partiellement ou entièrement de matériau polymère recyclé, les fils comprenant des premier et deuxième ensembles de fils agencés sensiblement à angle droit les uns par rapport aux autres, caractérisé en ce que la proportion de matériau recyclé du premier ensemble de fils est supérieure à celle du deuxième ensemble de fils.
  2. Tissu selon la revendication 1, dans lequel certains des fils sont constitués sensiblement de matériau polymère recyclé.
  3. Tissu selon la revendication 1 ou 2, dans lequel au moins certains des fils sont constitués de matériau consistant en un mélange de matériau polymère neuf et de matériau polymère recyclé.
  4. Tissu selon la revendication 3, comprenant un mélange de fils neufs et de fils mélangés.
  5. Tissu selon l'une quelconque des revendications précédentes, dans lequel certains des fils sont constitués entièrement de matériau dérivé de matériau polymère neuf.
  6. Tissu selon l'une quelconque des revendications précédentes, dans lequel le premier ensemble de fils est constitué entièrement à partir de sources de polymère neuf, et le deuxième ensemble de fils est constitué entièrement à partir de sources de polymère recyclé.
  7. Tissu selon la revendication 6, dans lequel la proportion de fils neufs et de fils recyclés est d'environ 50/50.
  8. Tissu selon la revendication 6 ou 7, dans lequel la proportion de fils neufs et de fils recyclés se situe entre 50/50 et 20/80
  9. Tissu selon la revendication 6 ou 7, dans lequel la proportion de fils neufs et de fils recyclés se situe entre 50/50 et 80/20.
  10. Tissu selon la revendication 3 à 4, comprenant un mélange de fils mélangés et de fils recyclés.
  11. Tissu selon l'une quelconque des revendications 3, 4 ou 10, dans lequel les fils du premier ensemble de fils sont des fils mélangés présentant un premier assemblage de matériau neuf et recyclé, et les fils du deuxième ensemble de fils sont des fils mélangés présentant un deuxième assemblage différent, distinct, de matériau neuf et recyclé.
  12. Coussin de sécurité gonflable constitué d'un tissu selon l'une quelconque des revendications précédentes.
  13. Procédé de fabrication d'un coussin de sécurité gonflable, comprenant les étapes consistant à :
    fournir une pluralité de premier fils et une pluralité de deuxième fils, la proportion de matériau polymère recyclé présente dans les deuxièmes fils étant supérieure à la proportion de matériau polymère recyclé présente dans les premiers fils ;
    la sélection d'une première région ou direction des fils du coussin de sécurité gonflable, et d'une deuxième région ou direction des fils du coussin de sécurité gonflable, la première région ou direction des fils étant destinée à être exposée, au cours du déploiement du coussin de sécurité gonflable, à des forces supérieures à celles appliquées dans la deuxième région ou direction des fils ; et la formation du coussin de sécurité gonflable de manière que la deuxième région comprenne les deuxièmes fils ou que les deuxièmes fils se trouvent dans la deuxième direction des fils du coussin de sécurité gonflable, et de manière que la première région comprenne les premiers fils ou bien que les premiers fils se trouvent dans la première direction des fils du coussin de sécurité gonflable.
EP12176952.5A 2012-07-18 2012-07-18 Améliorations de ou relatives à un matériau d'airbag Active EP2687628B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12176952.5A EP2687628B1 (fr) 2012-07-18 2012-07-18 Améliorations de ou relatives à un matériau d'airbag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12176952.5A EP2687628B1 (fr) 2012-07-18 2012-07-18 Améliorations de ou relatives à un matériau d'airbag

Publications (2)

Publication Number Publication Date
EP2687628A1 EP2687628A1 (fr) 2014-01-22
EP2687628B1 true EP2687628B1 (fr) 2018-11-14

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ID=46548284

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EP12176952.5A Active EP2687628B1 (fr) 2012-07-18 2012-07-18 Améliorations de ou relatives à un matériau d'airbag

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023131904A1 (fr) 2022-01-10 2023-07-13 Inv Performance Materials, Llc Tissu pour coussin gonflable de véhicule

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995020507A1 (fr) * 1994-01-28 1995-08-03 Asahi Kasei Kogyo Kabushiki Kaisha Sac gonflable
PT2436836T (pt) * 2009-05-29 2017-05-19 Toyo Boseki Tecido de base revestido para airbag e método para a sua produção

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023131904A1 (fr) 2022-01-10 2023-07-13 Inv Performance Materials, Llc Tissu pour coussin gonflable de véhicule

Also Published As

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EP2687628A1 (fr) 2014-01-22

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