JP4144441B2 - Airbag cover and airbag storage member - Google Patents
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- JP4144441B2 JP4144441B2 JP2003170412A JP2003170412A JP4144441B2 JP 4144441 B2 JP4144441 B2 JP 4144441B2 JP 2003170412 A JP2003170412 A JP 2003170412A JP 2003170412 A JP2003170412 A JP 2003170412A JP 4144441 B2 JP4144441 B2 JP 4144441B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、機械的特性、軽量コンパクト性を同時に兼ね備え、かつ収納作業性に優れたエアバッグカバーおよびそれからなるエアバッグ収納部材に関するものである。
【０００２】
【従来の技術】
近年、各種交通機関、特に自動車の事故が発生した際に、乗員の安全を確保するために、種々のエアバッグが開発され、その有効性が認識され、急速に実用化が進んでいる。それらは前突から乗員を保護する運転席用エアバッグ、助手席用エアバッグ、さらに乗員の下肢部を保護するニーエアバッグがあり、側突から乗員を保護するサイドエアバッグやカーテンエアバッグも普及している。
【０００３】
このようなエアバッグは、車両の衝突時にバッグを膨張させ、乗員の動きを拘束し衝突の衝撃から乗員を保護する。構成としては、ガス発生器であるインフレータ、ガスにより膨張するエアバッグ、および収納部材からなる。
【０００４】
車両に搭載されるエアバッグは、所定に折り畳まれた後、癖付けを施し形崩れしないようにした後、収納部材に入れられ組み立てられる。
【０００５】
しかし、エアバッグの折り畳み容量は、折り畳み直後と癖付け後で異なり、折り畳み直後はエアバッグ基布に折り癖がついておらず、その基布の折り畳み反発により収納、組み立て作業が困難になる問題がある。
【０００６】
その問題を解決するため、折り畳まれたエアバッグ基布をおさえる不織布を用い折り畳み反発を解消する方法が開示されているが（例えば、特許文献１参照。）、不織布を単にエアバッグカバーとして取り付けているだけでは、エアバッグを車輌に装着している間の基布の折り畳み反発の抑制という点では十分なものではなかった。さらに、エアバッグカバーとして使用する合成樹脂シート、フィルム、不織布および織布等のシート状体を用い、折り畳み後のエアバッグの露出あるいは突出防止の面でシート形状を改善したものが開示されているが、エアバッグカバーとしての優れたシート状体の機械的特性や使用方法は開示されておらず、軽量コンパクト性や収納作業性に優れていないのがこれまでの実状であり、その技術の開示すらなかった（例えば、特許文献２、３参照。）。
【０００７】
【特許文献１】
特開平８−２４４５４５号公報
【０００８】
【特許文献２】
特開平７−２１５１５６号公報
【０００９】
【特許文献３】
特開平９−１１８１８７号公報
【００１０】
【発明が解決しようとする課題】
本発明は、かかる従来のエアバッグカバーの欠点に鑑み、機械的特性、軽量コンパクト性を同時に兼ね備え、かつ収納作業性に優れたエアバッグカバーおよびそれからなるエアバッグ収納部材を提供せんとするものである。
【００１１】
【課題を解決するための手段】
本発明は、かかる課題を解決するために、次のような手段を採用する。すなわち、
（１）タテ方向の引張強力をヨコ方向の引張強力で割った引張強力比が１．８〜５の範囲内にあり、タテ方向、ヨコ方向いずれかの引張強力が１００ｃＮ／５ｃｍ以上であり、かつ、目付が３０〜１３０ｇ／ｍ２の範囲内にある布帛からなることを特徴とするエアバッグカバー。
（２）タテ方向の引張強力をヨコ方向の引張強力で割った引張強力比が２〜４の範囲内にあることを特徴とする、前記（１）に記載のエアバッグカバー。
（３）１０５℃雰囲気下で４００時間放置後の引張強力および引裂強力の保持率が８０％以上であることを特徴とする、前記（１）または（２）に記載のエアバッグカバー。
（４）不織布からなることを特徴とする、前記（１）〜（３）のいずれかに記載のエアバッグカバー。
（５）不織布がポリエステルからなることを特徴とする前記（４）に記載のエアバッグカバー。
（６）前記（１）〜（５）のいずれかに記載のエアバッグカバーを用いたエアバッグ収納部材。
【００１２】
【発明の実施の形態】
本発明における合成繊維としては、繊維形成性ポリマーであれば特に限定されることはなく、一般的に用いられるポリオレフィン、ポリアミド、ポリエステル、ポリアクリロニトリルあるいはそれらの共重合体などを使用することができ、それらの中でもエアバッグ搭載車輌が地球上で通常使用されるあらゆる環境、例えば砂漠地帯のような高温地や薬品を積載し使用するような環境に耐え得るよう、耐熱性、あるいは耐アミン性に優れたポリエステルあるいはそれらの共重合体などか実用上好ましく使用される。かかる繊維には、原糸の製造工程や加工工程での生産性あるいは特性改善のために通常使用されている各種添加剤を含んでもよい。たとえば熱安定剤、酸化防止剤、光安定剤、平滑剤、帯電防止剤、可塑剤、増粘剤、顔料、難燃剤などを含有せしめることができる。
【００１３】
本発明のエアバッグカバーとしては、織物、不織布などのようなエアバッグカバーとしての引張強力、引裂強力等の機械的特性を満足するものであれば良い。その中でも軽量化、低コストの面から不織布であることが特に好ましい。
【００１４】
本発明のエアバッグカバーには、引張強力のタテ方向とヨコ方向との強力比が１．８〜５の範囲内にあることが機械的特性面および収納コンパクト性面を両立させるため必要であり、好ましくは２〜４の範囲内がよい。エアバッグの収納組み立て作業時に実施される、エアバッグカバーを一方向に引張りながら折り畳んだバッグを覆う作業において、その引張方向は高い引張強力が必要であるが、引張方向と直交する方向はそれほどの引張強力は必要ではなく、本発明の範囲内にすることにより、エアバッグカバーのトータル目付が軽量化でき、収納コンパクト性、コスト面で優位になる。引張強力比が１．８未満であると、一方向の引張強力は他方ほど必要ではないにもかかわらず、引張強力が高い方向と同程度の引張強力であるということであり、結果としてトータルの目付が大きくなり軽量コンパクト性に劣る。また、逆に引張強力比が５より大きいとタテ方向とヨコ方向の引張強力に差が生じ、エアバッグ展開時にカバーを容易に破断するためにヨコ方向などに切れ目を施す場合等は展開前に切れ目が容易に切れてしまい折り畳んだエアバッグ基布が突出する恐れがあり、エアバッグカバーとしての折り畳んだエアバッグ基布を抑える機能を果たすことができない可能性がある。
【００１５】
本発明におけるエアバッグカバーは目付が３０〜１３０ｇ／ｍ2の範囲内にあることが、軽量コンパクト性および機械的特性面を両立させるために好ましく、さらに好ましくは５０〜１００ｇ／ｍ2の範囲内にあるのが良い。目付が３０ｇ／ｍ2未満であると、収納組み立て作業時に実施されるカバーを一方向に引張って折り畳んだバッグを覆う作業において、カバーが破断しやすくなり、折り畳んだエアバッグ基布を抑える機能を果たすことができない恐れがあり、良くない。また、目付が１３０ｇ／ｍ2より大きいと、エアバッグカバーが嵩高くなり収納コンパクト性面で問題が生じる。
【００１６】
また、本発明のエアバッグカバーは１０５℃雰囲気下で４００時間放置後の引張強力および引裂強力の保持率が８０％以上であることが自動車安全部材としての機械的特性の面で特に必要であり、さらには保持率が９０％以上であることが好ましい。測定には通常使用の高温乾燥機を使用し、基布を１０５℃の雰囲気下で４００時間乾燥機に放置後、取り出し、温度２０℃、湿度６０％で２４時間放置した後に測定を行う。エアバッグは長期間車両に搭載され、高温下で使用されることから、強力の保持率が８０％未満であれば、エアバッグ基布が展開前にエアバッグカバーから突出し、エアバッグ展開時の展開性能が不均一になる恐れがあり、良くない。本発明における高温処理後の強力保持率を満足させるためには、原糸の製造工程、加工工程において熱安定剤、酸化防止剤、あるいは難燃剤を含有させることが重要となる。
【００１７】
また、本発明のエアバッグカバーは、サイドエアバッグ、ニーエアバッグ、助手席用エアバッグの収納部材に適しているが、運転席用エアバッグ、後部座席用エアバッグなどの収納部材にも使用することができる。
【００１８】
本発明のエアバッグカバーおよびエアバッグ収納部材の特徴は、機械的特性、軽量コンパクト性を満足しつつ、特に収納作業性に優れているという点にある。
【００１９】
【実施例】
次に実施例により、本発明をさらに詳しく説明する。なお、実施例中における各種評価は、下記の方法に従って行なった。
引張強力 ：ＪＩＳ Ｌ１０９６（８．１２．１Ａ法）に基づき、織物幅は５ｃｍ、引張つかみ間隔２０ｃｍ、、引張速度１００ｍｍ／ｍｉｎで引っ張った時の破断強力を測定した。
破断伸度 ：ＪＩＳ Ｌ１０９６（８．１２．１Ａ法）に基づき、求めた。
引裂強力 ：ＪＩＳ Ｌ１０９６（８．１５．２Ａ−２法）に基づき、引張速度２００ｍｍ／ｍｉｎで引っ張ったときの引裂強力を求めた。
目付 ：タテ１ｍ、ヨコ１ｍの不織布の重量を測定し、目付を求めた。
熱老化試験 ：高温乾燥機にて１０５℃雰囲気下で、４００時間放置後、取り出し、温度２０℃、湿度６０％で２４時間放置した後に基布の引張強力および引裂強力を測定した。
【００２０】
実施例１
融点が２６０℃のポリエステル繊維８０重量％とイソフタル酸を共重合成分とする融点が２３０℃のポリエステル繊維２０重量％との比率で混合した混繊繊維と、さらにこの混繊繊維と同じポリマーを用いて低融点成分（融点が２３０℃のポリエステル繊維）を鞘部として１５重量％、芯部は高融点成分（融点が２６０℃のポリエステル繊維）を８５重量％とした芯鞘型複合繊維とを各々１：１の割合で２．２デシテックスの連続フィラメントを補集し、目付３５ｇ／ｍ2の不織布シートを得た。
【００２１】
【表１】
表１から明らかなように、得られた不織布はタテ方向とヨコ方向との引張強力比が３．７であり、目付が小さいにもかかわらず、十分な引張強力を有しており、エアバッグカバーとしての収納組み立て作業性に優れていた。また、自動車をとりまく環境変化に対応した熱老化試験後の強力保持率も良好であった。
【００２３】
比較例１
実施例１と同一の原料を用い、繊度が５．６デシテックス、不織布の目付を２０ｇ／ｍ2とした。得られた不織布はタテ方向とヨコ方向との引張強力比が４．６であったが、十分な引張強力を有しておらず、収納組み立て作業時に基布が破れる結果となった。したがって、作業性に劣っており、エアバッグカバーとして十分なものでなかった。
【００２４】
実施例２
融点２６０℃のポリエステル繊維を用いて３．３デシテックスの連続フィラメントを補集し、目付５５ｇ／ｍ2の不織布シートを得た。
【００２５】
表１から明らかなように、得られた不織布はタテ方向とヨコ方向との引張強力比が２．３であり、目付が小さいにもかかわらず、十分な引張強力を有しており、エアバッグカバーとしての収納組み立て作業性に非常に優れていた。また、自動車をとりまく環境変化に対応した熱老化試験後の強力保持率も良好であった。
【００２６】
比較例２
実施例２と同様のポリエステル繊維を用いて３．３デシテックスの連続フィラメントを補集し、目付５１ｇ／ｍ2の不織布シートを得た。
【００２７】
表１から明らかなように、得られた不織布はタテ方向とヨコ方向との引張強力比が１．５であり、目付が実施例２とほぼ同等であるにもかかわらず、厚みが増え嵩高くなり、かつ実施例２に比べタテ方向の引張強力が低いことから、エアバッグカバーとしての収納組み立て作業性に劣っていた。
【００２８】
実施例３
実施例２と同様のポリエステル繊維を用いて２デニールの連続フィラメントを補集し、目付７０ｇ／ｍ2の不織布シートを得た。
【００２９】
表１から明らかなように、得られた不織布はタテ方向とヨコ方向との引張強力比が２．６であり、目付が小さいにもかかわらず、十分な引張強力を有しており、エアバッグカバーとしての収納組み立て作業性に非常に優れていた。また、自動車をとりまく環境変化に対応した熱老化試験後の強力保持率も良好であった。
【００３０】
比較例３
目付５５ｇ／ｍ2のタイベック(TYVEK)(登録商標）不織布を使用する。
【００３１】
表１から明らかなように、タイベック不織布はタテ方向とヨコ方向との引張強力比が０．９であり、目付が実施例３とほぼ同等であるにもかかわらず、十分な引張強力を有しており、エアバッグカバーとしての収納組み立て作業性に優れていた。しかし、熱老化試験後の引裂強力保持率が６２％と非常に低いため、エアバッグが車両に搭載されている間にエアバッグカバーが引き裂かれ、エアバッグ展開が正常に行われない恐れがあり良くない。
【００３２】
実施例４
実施例２と同様のポリエステル繊維を用いて３．３デシテックスの連続フィラメントを補集し、目付１３０ｇ／ｍ2の不織布シートを得た。
【００３３】
表１から明らかなように、得られた不織布はタテ方向とヨコ方向との引張強力比が１．８であり、十分な引張強力を有しており、エアバッグカバーとしての収納組み立て作業性に非常に優れていた。また、自動車をとりまく環境変化に対応した熱老化試験後の強力保持率も良好であった。
【００３４】
【発明の効果】
本発明によれば、機械的特性および軽量コンパクト性を同時に兼ね備え、かつ収納作業性に優れたエアバッグカバーおよびそれからなるエアバッグ収納部材を提供することができるので、エアバッグによる乗員保護システムを普及促進させることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an airbag cover having both mechanical characteristics and lightweight compactness and excellent storage workability, and an airbag storage member comprising the same.
[0002]
[Prior art]
In recent years, various types of airbags have been developed to ensure the safety of passengers in the event of accidents in various transportation facilities, especially automobiles, and their effectiveness has been recognized, and their practical application is rapidly progressing. They include driver airbags that protect passengers from frontal crashes, passenger airbags, knee airbags that protect the lower limbs of passengers, and side airbags and curtain airbags that protect passengers from side impacts. It is popular.
[0003]
Such an airbag inflates the bag when the vehicle collides, restrains the movement of the occupant, and protects the occupant from the impact of the collision. The configuration includes an inflator that is a gas generator, an airbag that is inflated by gas, and a storage member.
[0004]
An airbag mounted on a vehicle is folded into a predetermined shape, and is then brazed so as not to lose its shape, and is then put into a storage member and assembled.
[0005]
However, the folding capacity of an airbag is different from that immediately after folding and after brazing. Immediately after folding, there is no fold on the airbag base fabric, which makes it difficult to store and assemble due to the folding back of the base fabric. is there.
[0006]
In order to solve the problem, there is disclosed a method for eliminating folding repulsion using a nonwoven fabric that holds a folded airbag base fabric (see, for example, Patent Document 1), but the nonwoven fabric is simply attached as an airbag cover. However, it was not sufficient in terms of suppressing the folding and rebounding of the base fabric while the airbag was mounted on the vehicle. Further, a sheet having a sheet shape improved in terms of preventing the airbag from being exposed or protruding after being folded using a sheet-like body such as a synthetic resin sheet, a film, a nonwoven fabric, and a woven fabric used as an airbag cover is disclosed. However, the mechanical properties and usage of an excellent sheet-like body as an air bag cover are not disclosed, and the actual situation so far is that it is not excellent in lightweight compactness and storage workability. Not even (see, for example, Patent Documents 2 and 3).
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 8-244545
[Patent Document 2]
JP-A-7-215156
[Patent Document 3]
JP-A-9-118187
[Problems to be solved by the invention]
In view of the shortcomings of the conventional airbag cover, the present invention is to provide an airbag cover that has both mechanical characteristics and light weight and compactness, and has excellent storage workability, and an airbag storage member comprising the airbag cover. is there.
[0011]
[Means for Solving the Problems]
The present invention employs the following means in order to solve such problems. That is,
(1) The tensile strength ratio obtained by dividing the tensile strength in the vertical direction by the tensile strength in the horizontal direction is in the range of 1.8 to 5, and the tensile strength in either the vertical direction or the horizontal direction is 100 cN / 5 cm or more. and the airbag cover, characterized in that the basis weight is made of a fabric in the range of 30~130g / m 2.
(2) The airbag cover according to (1) above, wherein a tensile strength ratio obtained by dividing the tensile strength in the vertical direction by the tensile strength in the horizontal direction is in the range of 2 to 4 .
(3) The airbag cover according to (1) or (2) above, wherein a retention rate of tensile strength and tear strength after being left in a 105 ° C. atmosphere for 400 hours is 80% or more .
(4) The airbag cover according to any one of (1) to (3), which is made of a nonwoven fabric .
(5) The airbag cover according to (4), wherein the nonwoven fabric is made of polyester .
(6) An airbag housing member using the airbag cover according to any one of (1) to (5).
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The synthetic fiber in the present invention is not particularly limited as long as it is a fiber-forming polymer, and generally used polyolefin, polyamide, polyester, polyacrylonitrile or a copolymer thereof can be used, Among them, heat resistance or amine resistance is excellent so that it can withstand any environment in which airbag-equipped vehicles are normally used on the earth, such as high-temperature areas such as desert areas and environments where chemicals are loaded and used. Polyester or copolymers thereof are preferably used practically. Such fibers may contain various additives usually used for improving the productivity or properties in the production process and processing process of the raw yarn. For example, a heat stabilizer, antioxidant, light stabilizer, smoothing agent, antistatic agent, plasticizer, thickener, pigment, flame retardant and the like can be included.
[0013]
The airbag cover of the present invention may be any as long as it satisfies mechanical properties such as tensile strength and tear strength as an airbag cover such as woven fabric and nonwoven fabric. Among these, non-woven fabrics are particularly preferable from the viewpoint of weight reduction and low cost.
[0014]
In the airbag cover of the present invention, it is necessary for the strength ratio between the vertical direction and the horizontal direction of the tensile strength to be in the range of 1.8 to 5 in order to achieve both mechanical characteristics and storage compactness. , Preferably in the range of 2-4. In the operation to cover the folded bag while pulling the airbag cover in one direction, which is performed at the time of storing and assembling the airbag, the tensile direction requires a high tensile strength, but the direction perpendicular to the tensile direction is not so much. The tensile strength is not necessary, and by making it within the scope of the present invention, the total weight of the airbag cover can be reduced, and the storage compactness and cost are superior. If the tensile strength ratio is less than 1.8, the tensile strength in one direction is not necessary as much as the other, but the tensile strength is about the same as the direction in which the tensile strength is high. Larger weight per unit and inferior in weight and compactness. Conversely, if the tensile strength ratio is greater than 5, there will be a difference in the tensile strength between the vertical and horizontal directions. There is a possibility that the cut is easily cut and the folded airbag base fabric may protrude, and the function of suppressing the folded airbag base fabric as the airbag cover may not be achieved.
[0015]
The airbag cover of the present invention preferably has a basis weight in the range of 30 to 130 g / m 2 in order to achieve both lightweight compactness and mechanical characteristics, and more preferably in the range of 50 to 100 g / m 2 . It is good to be in. When the weight per unit area is less than 30 g / m 2 , the cover is easily broken when the cover is folded by pulling the cover in one direction at the time of storage and assembly work, and the function of suppressing the folded airbag base fabric is provided. There is a fear that it cannot be done, and it is not good. On the other hand, if the basis weight is larger than 130 g / m 2 , the airbag cover becomes bulky, which causes a problem in terms of storage compactness.
[0016]
In addition, the airbag cover of the present invention is required to have a tensile strength and tear strength retention ratio of 80% or more after being left in a 105 ° C. atmosphere for 400 hours in terms of mechanical characteristics as an automobile safety member. Furthermore, the retention is preferably 90% or more. For the measurement, a commonly used high-temperature dryer is used, and the base fabric is left in a dryer for 400 hours in an atmosphere of 105 ° C., then taken out and left for 24 hours at a temperature of 20 ° C. and a humidity of 60%. Since the airbag is mounted on the vehicle for a long period of time and used at high temperatures, if the strength retention is less than 80%, the airbag base fabric protrudes from the airbag cover before deployment, There is a possibility that the deployment performance will be uneven, which is not good. In order to satisfy the strength retention after the high temperature treatment in the present invention, it is important to contain a heat stabilizer, an antioxidant, or a flame retardant in the raw yarn manufacturing process and processing process.
[0017]
The airbag cover of the present invention is suitable as a storage member for side airbags, knee airbags, and passenger airbags, but is also used for storage members such as driver airbags and rear seat airbags. can do.
[0018]
The air bag cover and the air bag housing member of the present invention are characterized in that they are particularly excellent in workability while satisfying mechanical properties and light weight and compactness.
[0019]
【Example】
Next, the present invention will be described in more detail with reference to examples. Various evaluations in the examples were performed according to the following methods.
Tensile strength: Based on JIS L1096 (8.12.1A method), the breaking strength was measured when the fabric width was 5 cm, the tension grip interval was 20 cm, and the tensile speed was 100 mm / min.
Breaking elongation: determined based on JIS L1096 (8.12.1A method).
Tear strength: Based on JIS L1096 (8.15.2A-2 method), the tear strength when pulled at a tensile speed of 200 mm / min was determined.
Unit weight: The weight of a nonwoven fabric of 1 m in length and 1 m in width was measured to determine the basis weight.
Thermal aging test: After leaving in a high-temperature dryer at 105 ° C. for 400 hours, taking out and leaving at a temperature of 20 ° C. and a humidity of 60% for 24 hours, the tensile strength and tear strength of the base fabric were measured.
[0020]
Example 1
Using a mixed fiber mixed at a ratio of 80% by weight of polyester fiber having a melting point of 260 ° C. and 20% by weight of polyester fiber having a melting point of 230 ° C. using isophthalic acid as a copolymer component, and further using the same polymer as the mixed fiber And a core-sheath type composite fiber in which the low melting point component (polyester fiber having a melting point of 230 ° C.) is 15% by weight as the sheath, and the core is 85% by weight of the high melting point component (the polyester fiber having a melting point of 260 ° C.). A continuous filament of 2.2 dtex was collected at a ratio of 1: 1 to obtain a nonwoven fabric sheet having a basis weight of 35 g / m 2 .
[0021]
[Table 1]
As is apparent from Table 1, the obtained nonwoven fabric has a tensile strength ratio of 3.7 in the vertical direction and in the horizontal direction, and has a sufficient tensile strength even though the basis weight is small. Excellent storage and assembly workability as a cover. Moreover, the strength retention after the heat aging test corresponding to the environmental change surrounding the automobile was also good.
[0023]
Comparative Example 1
The same raw material as in Example 1 was used, the fineness was 5.6 dtex, and the basis weight of the nonwoven fabric was 20 g / m 2 . Although the obtained nonwoven fabric had a tensile strength ratio of 4.6 in the vertical direction and in the horizontal direction, it did not have sufficient tensile strength, resulting in the base fabric being torn during storage assembly work. Therefore, it is inferior in workability and is not sufficient as an airbag cover.
[0024]
Example 2
It was collected and continuous filaments of 3.3 dtex using the polyester fiber of melting point 260 ° C., to obtain a nonwoven fabric sheet having a basis weight of 55 g / m 2.
[0025]
As is apparent from Table 1, the obtained nonwoven fabric has a tensile strength ratio of 2.3 in the vertical direction and the horizontal direction, and has a sufficient tensile strength even though the basis weight is small. The storage assembly workability as a cover was very excellent. Moreover, the strength retention after the heat aging test corresponding to the environmental change surrounding the automobile was also good.
[0026]
Comparative Example 2
Using the same polyester fibers as in Example 2, 3.3 dtex continuous filaments were collected to obtain a nonwoven fabric sheet having a basis weight of 51 g / m 2 .
[0027]
As is apparent from Table 1, the obtained nonwoven fabric has a tensile strength ratio of 1.5 in the vertical direction and in the horizontal direction, and although the basis weight is substantially the same as in Example 2, the thickness increases and the bulk is high. Since the tensile strength in the vertical direction is lower than that in Example 2, the storage assembly workability as an airbag cover was inferior.
[0028]
Example 3
Using the same polyester fiber as in Example 2, 2 denier continuous filaments were collected to obtain a nonwoven fabric sheet having a basis weight of 70 g / m 2 .
[0029]
As is clear from Table 1, the obtained nonwoven fabric has a tensile strength ratio of 2.6 in the vertical direction and the horizontal direction, and has a sufficient tensile strength even though the basis weight is small. The storage assembly workability as a cover was very excellent. Moreover, the strength retention after the heat aging test corresponding to the environmental change surrounding the automobile was also good.
[0030]
Comparative Example 3
A TYVEK (R) non-woven fabric having a basis weight of 55 g / m < 2 > is used.
[0031]
As is clear from Table 1, the Tyvek nonwoven fabric has a tensile strength ratio of 0.9 in the vertical direction and in the horizontal direction, and has a sufficient tensile strength even though the basis weight is almost the same as in Example 3. It was excellent in storage assembly workability as an airbag cover. However, since the tear strength retention after the heat aging test is very low at 62%, the airbag cover may be torn while the airbag is mounted on the vehicle, and the airbag may not be deployed normally. Not good.
[0032]
Example 4
A 3.3 dtex continuous filament was collected using the same polyester fiber as in Example 2 to obtain a nonwoven fabric sheet having a basis weight of 130 g / m 2 .
[0033]
As is apparent from Table 1, the obtained nonwoven fabric has a tensile strength ratio of 1.8 in the vertical direction and in the horizontal direction, has sufficient tensile strength, and is easy to store and assemble as an airbag cover. It was very good. Moreover, the strength retention after the heat aging test corresponding to the environmental change surrounding the automobile was also good.
[0034]
【The invention's effect】
According to the present invention, it is possible to provide an airbag cover and an airbag storage member comprising the airbag cover that have both mechanical characteristics and light weight and compactness at the same time. Therefore, an occupant protection system using an airbag is widely used. Can be promoted.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003170412A JP4144441B2 (en) | 2003-06-16 | 2003-06-16 | Airbag cover and airbag storage member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003170412A JP4144441B2 (en) | 2003-06-16 | 2003-06-16 | Airbag cover and airbag storage member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2005001622A JP2005001622A (en) | 2005-01-06 |
| JP4144441B2 true JP4144441B2 (en) | 2008-09-03 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003170412A Expired - Fee Related JP4144441B2 (en) | 2003-06-16 | 2003-06-16 | Airbag cover and airbag storage member |
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| JP (1) | JP4144441B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4977633B2 (en) * | 2008-01-18 | 2012-07-18 | 倉敷繊維加工株式会社 | Airbag cover, manufacturing method thereof, and airbag storage member |
| JP7409566B1 (en) | 2022-07-29 | 2024-01-09 | 東レ株式会社 | Long-fiber nonwoven fabric, airbag packaging material containing the same, and method for producing long-fiber nonwoven fabric |
| WO2024024215A1 (en) * | 2022-07-29 | 2024-02-01 | 東レ株式会社 | Long fiber nonwoven fabric, airbag package including same, and method for producing long fiber nonwoven fabric |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07215156A (en) * | 1994-01-28 | 1995-08-15 | Ikeda Bussan Co Ltd | Air bag cover for air bag device |
| US5496056A (en) * | 1995-02-21 | 1996-03-05 | Morton International, Inc. | Automotive passenger air bag module cushion fold |
| JP3357939B2 (en) * | 1995-08-21 | 2002-12-16 | 豊田合成株式会社 | Airbag device |
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2003
- 2003-06-16 JP JP2003170412A patent/JP4144441B2/en not_active Expired - Fee Related
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| JP2005001622A (en) | 2005-01-06 |
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