JPH10264759A - Panel with built-in airbag - Google Patents
Panel with built-in airbagInfo
- Publication number
- JPH10264759A JPH10264759A JP9090053A JP9005397A JPH10264759A JP H10264759 A JPH10264759 A JP H10264759A JP 9090053 A JP9090053 A JP 9090053A JP 9005397 A JP9005397 A JP 9005397A JP H10264759 A JPH10264759 A JP H10264759A
- Authority
- JP
- Japan
- Prior art keywords
- airbag
- panel
- airbag cover
- resin
- built
- 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.)
- Pending
Links
- 229920001971 elastomer Polymers 0.000 claims abstract description 23
- 239000005060 rubber Substances 0.000 claims abstract description 23
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 18
- 239000000057 synthetic resin Substances 0.000 claims abstract description 18
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 11
- -1 polypropylene Polymers 0.000 claims abstract description 9
- 229920005604 random copolymer Polymers 0.000 claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 8
- 229920001577 copolymer Polymers 0.000 claims abstract description 7
- 229920013716 polyethylene resin Polymers 0.000 claims abstract description 7
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 7
- 239000004743 Polypropylene Substances 0.000 claims abstract description 6
- 229920001155 polypropylene Polymers 0.000 claims abstract description 6
- 239000000155 melt Substances 0.000 claims abstract description 5
- 150000001336 alkenes Chemical class 0.000 claims description 7
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 7
- 239000002649 leather substitute Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 239000010985 leather Substances 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 2
- 239000002344 surface layer Substances 0.000 abstract 2
- 239000000463 material Substances 0.000 description 13
- 238000000465 moulding Methods 0.000 description 10
- 229920002397 thermoplastic olefin Polymers 0.000 description 5
- 238000003776 cleavage reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002480 mineral oil Substances 0.000 description 4
- 230000007017 scission Effects 0.000 description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004711 α-olefin Substances 0.000 description 3
- 229920001400 block copolymer Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 239000012748 slip agent Substances 0.000 description 2
- 229920006132 styrene block copolymer Polymers 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- BXOUVIIITJXIKB-UHFFFAOYSA-N ethene;styrene Chemical group C=C.C=CC1=CC=CC=C1 BXOUVIIITJXIKB-UHFFFAOYSA-N 0.000 description 1
- 229920005676 ethylene-propylene block copolymer Polymers 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 239000010690 paraffinic oil Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002742 polystyrene-block-poly(ethylene/propylene) -block-polystyrene Polymers 0.000 description 1
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 230000037380 skin damage Effects 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Air Bags (AREA)
- Instrument Panels (AREA)
Abstract
Description
【０００１】[0001]
【技術分野】本発明は，エアバッグ装置を取り付けたエ
アバッグ内蔵パネルに関し，特にエアバッグカバーの外
表面に装飾用表皮を被覆してなるエアバッグ内蔵パネル
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel with a built-in airbag to which an airbag device is attached, and more particularly to a panel with a built-in airbag in which an outer surface of an airbag cover is covered with a decorative skin.
【０００２】[0002]
【従来技術】近年，多くの自動車には，エアバッグ装置
が取り付けられている。図３に示すごとく，エアバッグ
装置９は，衝突時に膨らんで乗員を衝撃から保護するエ
アバッグ９２と，エアバッグ９２を収納するエアバッグ
カバー９１と，エアバッグ９２に瞬時にガスを送り込む
インフレータ９３と，衝撃時における車両減速度を感知
しエアバッグの作動，非作動を判別するエアバッグセン
サ（図示略）とからなる。エアバッグカバー９１の略中
央部には凹所９１１が設けられており，エアバッグ膨張
時には凹所９１１よりエアバッグカバー９１が開裂す
る。図５に示すごとく，エアバッグ装置９は，例えば，
助手席の前面に位置するインストルメントパネル６に取
り付けられている。2. Description of the Related Art In recent years, many automobiles are equipped with an airbag device. As shown in FIG. 3, the airbag device 9 includes an airbag 92 that inflates at the time of a collision to protect the occupant from an impact, an airbag cover 91 that stores the airbag 92, and an inflator 93 that instantaneously sends gas to the airbag 92. And an airbag sensor (not shown) that senses the deceleration of the vehicle upon impact to determine whether the airbag is operating or not. A recess 911 is provided substantially at the center of the airbag cover 91, and the airbag cover 91 is torn from the recess 911 when the airbag is inflated. As shown in FIG. 5, the airbag device 9 is, for example,
It is attached to an instrument panel 6 located in front of the passenger seat.
【０００３】エアバッグカバーは，エアバッグの膨張時
に開裂しなければならない。一方，自動車内装パネル
は，機械的強度の高い材質であることが要求される。そ
のため，エアバッグカバーは，自動車内装パネルとは異
なる材質で成形されている。[0003] The airbag cover must be torn when the airbag is inflated. On the other hand, automobile interior panels are required to be made of a material having high mechanical strength. Therefore, the airbag cover is formed of a material different from that of the automobile interior panel.
【０００４】ところで，図３，図５に示すごとく，エア
バッグカバー９１をインストルメントパネル６と一体成
形することにより，製造工程の簡略化及び製造コストの
削減，更にはこれらの表面に装飾用表皮５を被覆して，
意匠性の向上を図ることが提案されている。As shown in FIGS. 3 and 5, the airbag cover 91 is integrally formed with the instrument panel 6, thereby simplifying the manufacturing process and reducing the manufacturing cost, and furthermore, decorating the decorative surface on these surfaces. Cover 5
It has been proposed to improve the design.
【０００５】上記インストルメントパネル６の成形方法
を説明すると，図４に示すごとく，まず，２色成形用の
金型７を用い，そのキャビティ７０内に，装飾用表皮５
をインサート表皮として配置する。次いで，キャビティ
７０のゲート７１１からパネル用材料としてＴＰＯ（ポ
リオレフィン系熱可塑性エラストマー）を注入し，エア
バッグカバー成形部を除いてキャビティ７０内をパネル
用材料６０で満たし，硬化させる。[0005] The method of forming the instrument panel 6 will be described. First, as shown in FIG.
Are placed as insert skins. Next, TPO (polyolefin-based thermoplastic elastomer) is injected as a panel material from the gate 711 of the cavity 70, and the inside of the cavity 70 is filled with the panel material 60 except for the airbag cover molding portion and cured.
【０００６】次いで，金型７を反転して，ゲート７１２
から，エアバッグカバー成形用のキャビティ７１内にカ
バー用材料９０を注入し，硬化させる。これにより，図
３，図５に示すごとく，装飾用表皮５により被覆された
インストルメントパネル６が得られる。Next, the mold 7 is turned over and the gate 712 is turned on.
Then, the cover material 90 is injected into the cavity 71 for molding the airbag cover, and is cured. As a result, as shown in FIGS. 3 and 5, the instrument panel 6 covered with the decorative skin 5 is obtained.
【０００７】エアバッグカバーは，低・高温時における
インフレーション性能を満足させる必要がある。特に，
低温時（−４０℃）のインフレーション性能を満足させ
ることの必要性から，一般に多量のゴム成分が添加され
る（特開平５−３８９９６号，特開平８−２３６３号，
特開平８−３４３０４号等）。The airbag cover needs to satisfy the inflation performance at low and high temperatures. Especially,
In general, a large amount of a rubber component is added due to the necessity of satisfying the inflation performance at a low temperature (−40 ° C.) (JP-A-5-38996, JP-A-8-2363,
JP-A-8-34304, etc.).
【０００８】[0008]
【解決しようとする課題】しかしながら，上記カバー用
材料は，成形時に流動性が悪い。そのため，カバー用材
料は，キャビティ７１内に高圧で注入しなければならな
い。そのため，装飾用表皮５の表面に無理な力が加わ
り，装飾用表皮５に伸び，破損等のダメージを受けるこ
とがある。However, the above-mentioned cover material has poor fluidity during molding. Therefore, the cover material must be injected into the cavity 71 at a high pressure. For this reason, an excessive force may be applied to the surface of the decorative skin 5 to extend the decorative skin 5 and be damaged or damaged.
【０００９】一方，流動性を向上させるため，パラフィ
ン系オイル等の鉱物油を添加することが知られている
が，本願の目的としているエアバッグカバーの外表面に
装飾用表皮が被覆されている構成体においては，使用中
にエアバッグカバーに添加された鉱物油が表皮側に徐々
に移行し，表皮が膨潤により変形する，膨らむ，又はエ
アバッグカバーの低温性能が悪化する等の耐久性能に問
題がある。On the other hand, it is known to add a mineral oil such as a paraffinic oil in order to improve the fluidity, but the decorative surface is coated on the outer surface of the airbag cover, which is the object of the present application. In the structure, the mineral oil added to the airbag cover during use gradually moves to the skin side, and the skin is deformed by swelling, swells, or the low-temperature performance of the airbag cover deteriorates. There's a problem.
【００１０】本発明はかかる従来の問題点に鑑み，装飾
用表皮にダメージを与えることなく，自動車内装パネル
との一体成形が可能で，かつ耐久性能に優れたエアバッ
グ内蔵パネルを提供しようとするものである。The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an airbag built-in panel which can be integrally formed with an automobile interior panel without damaging the decorative skin and has excellent durability. Things.
【００１１】[0011]
【課題の解決手段】請求項１の発明は，自動車内装パネ
ルのエアバッグ収納部にエアバッグ作動時に開裂するエ
アバッグカバーを設けてなり，かつ，該エアバッグカバ
ーの外表面には，自動車内装パネルの外表面に連続形成
した，装飾用表皮を設けてなるエアバッグ内蔵パネルに
おいて，上記エアバッグカバーは，メルトフローレート
が５ｇ／１０分〜５０ｇ／１０分であり，かつ，動的粘
弾性ｔａｎδのピーク値の温度が−３５℃以下の合成樹
脂を成形してなり，また，上記合成樹脂は，ポリプロピ
レン樹脂又はポリエチレン樹脂の一方又は双方からなる
オレフィン系樹脂２０〜８０重量％と，スチレン系共重
合体ゴム又はオレフィン系ランダム共重合体ゴムの一方
又は双方からなるゴム成分８０〜２０重量％とからなる
ことを特徴とするエアバッグ内蔵パネルである。According to a first aspect of the present invention, an airbag cover is provided in an airbag storage portion of an automobile interior panel, the airbag cover being opened when the airbag is activated. In the airbag built-in panel provided with a decorative skin continuously formed on the outer surface of the panel, the airbag cover has a melt flow rate of 5 g / 10 min to 50 g / 10 min and a dynamic viscoelasticity. A synthetic resin having a peak tan δ temperature of −35 ° C. or less is molded. The synthetic resin is composed of 20 to 80% by weight of an olefin resin composed of one or both of a polypropylene resin and a polyethylene resin, and a styrene resin. A rubber component comprising 80 to 20% by weight of one or both of a copolymer rubber and an olefin random copolymer rubber. Is an airbag built-in panel.
【００１２】本発明のエアーバッグ内蔵パネルにおい
て，エアバッグカバーの材料は，メルトフローレート及
び動的粘弾性ｔａｎδのピーク値の温度が上記の範囲内
にあり，かつ上記の組成を有する合成樹脂である。その
ため，自動車内装パネルとの一体成形が可能である。In the airbag built-in panel according to the present invention, the material of the airbag cover is a synthetic resin having a melt flow rate and a peak temperature of dynamic viscoelasticity tan δ within the above ranges and having the above composition. is there. Therefore, it can be integrally formed with an automobile interior panel.
【００１３】また，成形時の流動性が良い。それ故，金
型のキャビティ内に装飾用表皮を予め配置しておき，そ
のキャビティ内に上記合成樹脂を注入したとき，装飾用
表皮に無理な力が加わらない。従って，装飾用表皮に，
伸び，破損等のダメージを与えることなく成形できる。Also, the fluidity during molding is good. Therefore, when the decorative skin is previously arranged in the cavity of the mold and the synthetic resin is injected into the cavity, no excessive force is applied to the decorative skin. Therefore, for the decorative skin,
It can be formed without giving damage such as elongation and breakage.
【００１４】また，例えば−３５℃といった低温環境に
おいても，エアバッグの膨張時に円滑に開裂して，エア
バッグを乗員へ向けて円滑に膨らませることができ，乗
員を衝突時の衝撃から保護することができる。Further, even in a low temperature environment of, for example, -35 ° C., the airbag can be smoothly torn at the time of inflation, and the airbag can be smoothly inflated toward the occupant, thereby protecting the occupant from an impact at the time of collision. be able to.
【００１５】本発明において，エアバッグカバーの合成
樹脂のメルトフローレート（以下，ＭＦＲともいう。）
は，２３０℃，２．１６ｋｇ／ｃｍ2 荷重時の値であ
る。そして，ＭＦＲが５ｇ／１０分未満の場合には，成
形時の流動性が低下し，装飾用表皮にダメージを与え
る。逆に，ＭＦＲが５ｇ／１０分を越える場合には，エ
アバッグカバーの耐衝撃性が低下する場合がある。ま
た，エアバッグカバーの合成樹脂の動的粘弾性ｔａｎδ
のピーク値の温度が−３５℃よりも高い場合には，例え
ば−３５℃の低温環境下でエアバッグカバーが円滑に開
裂しない場合がある。In the present invention, the melt flow rate of the synthetic resin of the airbag cover (hereinafter, also referred to as MFR).
Is a value at 230 ° C. and a load of 2.16 kg / cm 2 . If the MFR is less than 5 g / 10 minutes, the fluidity during molding is reduced, and the decorative skin is damaged. Conversely, if the MFR exceeds 5 g / 10 minutes, the impact resistance of the airbag cover may decrease. Also, the dynamic viscoelastic tanδ of the synthetic resin of the airbag cover
If the temperature of the peak value is higher than −35 ° C., the airbag cover may not be opened smoothly in a low temperature environment of −35 ° C., for example.
【００１６】本発明のエアバッグカバーの合成樹脂は，
ポリプロピレン樹脂又はポリエチレン樹脂の一方又は双
方からなるオレフィン系樹脂２０〜８０重量％と，スチ
レン系共重合体ゴム又はオレフィン系ランダム共重合体
ゴムの一方又は双方からなるゴム成分８０〜２０重量％
の材料構成において，ＭＦＲが５〜５０，ｔａｎδのピ
ーク温度が−３５℃以下を満足させることが必要であ
る。The synthetic resin of the airbag cover according to the present invention comprises:
20 to 80% by weight of an olefin resin composed of one or both of a polypropylene resin and a polyethylene resin, and 80 to 20% by weight of a rubber component composed of one or both of a styrene-based copolymer rubber and an olefin-based random copolymer rubber
It is necessary to satisfy the MFR of 5 to 50 and the peak temperature of tan δ of −35 ° C. or less in the material constitution of the above.
【００１７】上記材料構成において本特性を満足したう
えで，更に流動性及び／又は低温性をより向上させたい
場合には，耐久性能を害されない範囲内において少量の
鉱物油，可塑剤，滑剤，スリップ剤を添加してもよい。
好ましい範囲は鉱物油，可塑剤の場合は３０重量部以
下，更に好ましくは２０重量部以下，滑剤，スリップ剤
の場合は２重量部以下，更に好ましくは１重量部以下で
ある。In order to further improve the fluidity and / or low-temperature properties while satisfying the above characteristics in the above-mentioned material constitution, a small amount of mineral oil, plasticizer, lubricant, A slip agent may be added.
The preferred range is 30 parts by weight or less, more preferably 20 parts by weight or less for mineral oils and plasticizers, and 2 parts by weight or less, more preferably 1 part by weight or less for lubricants and slip agents.
【００１８】また，上記ポリプロピレン樹脂としては，
例えば，ＭＦＲが１０〜２００で，プロピレンのホモポ
リマーのほかに，プロピレンとエチレン又はプロピレン
と炭素数Ｃ4 〜Ｃ12のα−オレフィンとのブロック又は
ランダム共重合体があげられる。特に好ましい例は，エ
チレン含量１〜２０重量％，ＭＦＲ２５〜１００のエチ
レン−プロピレンブロック共重合体である。これによ
り，上述のエアバッグカバーの効果をより一層高めるこ
とができる。Further, as the polypropylene resin,
For example, in addition to a propylene homopolymer having an MFR of 10 to 200, a block or random copolymer of propylene and ethylene or propylene and an α-olefin having C 4 to C 12 carbon atoms may be used. A particularly preferred example is an ethylene-propylene block copolymer having an ethylene content of 1 to 20% by weight and an MFR of 25 to 100. Thereby, the effect of the airbag cover described above can be further enhanced.
【００１９】上記ポリエチレン樹脂としては，例えば，
ＭＦＲ（１９０℃）が１〜１００で，高密度ポリエチレ
ン，中密度ポリエチレン，低密度ポリエチレン，線状低
密度ポリエチレン，或いはこれらの混合物を用いること
が好ましい。これにより，上述のエアバッグカバーの効
果をより一層高めることができる。As the polyethylene resin, for example,
It is preferable to use a high-density polyethylene, a medium-density polyethylene, a low-density polyethylene, a linear low-density polyethylene, or a mixture thereof, having an MFR (190 ° C.) of 1 to 100. Thereby, the effect of the airbag cover described above can be further enhanced.
【００２０】また，上記スチレン系共重合体ゴムとして
は，スチレン−ブタジエン−スチレンブロック共重合
体，スチレン−イソプレン−スチレンブロック共重合
体，スチレン−エチレン−ブチレン−スチレンブロック
共重合体，スチレン−エチレン−プロピレン−スチレン
ブロック共重合体，水素添加スチレン−ブタジエンゴ
ム，スチレン−エチレン−ブチレン−オレフィンブロッ
ク共重合体，或いはこれらの混合物が代表例としてあげ
られる。The styrene copolymer rubbers include styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene Representative examples include a propylene-styrene block copolymer, a hydrogenated styrene-butadiene rubber, a styrene-ethylene-butylene-olefin block copolymer, and a mixture thereof.
【００２１】上記オレフィン系ランダム共重合体ゴムと
しては，例えば，エチレンプロピレンラバー（以下，Ｅ
ＰＲという。），又はエチレンとα−オレフィンとのラ
ンダム共重合体ゴムで，α−オレフィンとしては，プロ
ピレン，ブチレン，ヘキセン，オクテン等の炭素数Ｃ3
〜Ｃ12のものがあげられる。また，２種以上のゴムをブ
レンドしてもよい。As the olefin random copolymer rubber, for example, ethylene propylene rubber (hereinafter referred to as E)
Called PR. ) Or a random copolymer rubber of ethylene and an α-olefin, wherein the α-olefin is a C 3 carbon atom such as propylene, butylene, hexene, octene or the like.
Include those of ~C 12. Further, two or more rubbers may be blended.
【００２２】本発明において，上記オレフィン系樹脂が
２０重量％未満の場合には，合成樹脂の流動性が悪く，
成形時に装飾用表皮がダメージを受ける場合がある。ま
た，高温時に，エアバッグカバーの開裂性能にも不具合
が生じる場合がある。一方，８０重量％を越える場合に
は，低温時における開裂性能に不具合が生じる場合があ
る。また，特に好ましくはその下限が２５重量％，その
上限が７０重量％である。In the present invention, if the content of the olefin resin is less than 20% by weight, the fluidity of the synthetic resin is poor,
The decorative skin may be damaged during molding. Also, at high temperatures, the airbag cover may have a problem in tearing performance. On the other hand, if the content exceeds 80% by weight, a problem may occur in the cleavage performance at low temperatures. Particularly preferably, the lower limit is 25% by weight and the upper limit is 70% by weight.
【００２３】また，上記ゴム成分が２０重量％未満の場
合には，低温時における開裂性能に不具合が生じる場合
がある。一方，８０重量％を越える場合には，合成樹脂
の流動性が低下し，成形時に装飾用表皮にダメージを与
えることがある。更に，高温時における開裂性能にも不
具合が生じる場合がある。また，上記エアバッグ内蔵パ
ネルとしては，実施形態例に示すインストルメントパネ
ル，自動車ドアの内装面（ドアトリム）等がある。If the rubber component is less than 20% by weight, there may be a problem in the tearing performance at low temperatures. On the other hand, if it exceeds 80% by weight, the fluidity of the synthetic resin is reduced, and the decorative skin may be damaged during molding. Further, there may be a case where the cleavage performance at a high temperature becomes defective. Examples of the airbag built-in panel include the instrument panel described in the embodiment, the interior surface (door trim) of an automobile door, and the like.
【００２４】次に，請求項２の発明のように，上記装飾
用表皮は，合成皮革，天然皮革又は，ファブリックのい
ずれかであることが好ましい。この中，合成皮革として
は，軟質ＰＶＣ，ＴＰＯ（熱可塑性ポリオレフィンエラ
ストマー），ポリウレタン等を用いることができるが，
生産性，耐久性能及び経済性から軟質ＰＶＣ，ＴＰＯが
特に好ましい。Next, as in the second aspect of the present invention, the decorative skin is preferably one of synthetic leather, natural leather, and fabric. Among them, as synthetic leather, soft PVC, TPO (thermoplastic polyolefin elastomer), polyurethane and the like can be used.
Soft PVC and TPO are particularly preferred in terms of productivity, durability performance and economy.
【００２５】また，図１，図２に示すごとく，装飾用表
皮５と，自動車内装パネル６０及びエアバッグカバー９
１とを接着させるために，装飾用表皮５の裏面にオレフ
ィン系樹脂等の接着層２を設けてもよい（図１）。ま
た，更に装飾用表皮５の触感性，柔軟性を向上させるた
めに，図２に示すごとく，装飾用表皮と接着層２との中
間に発泡層３を設けてもよい。発泡層３としては，オレ
フィン系樹脂，ウレタン系樹脂を用いることができる。As shown in FIGS. 1 and 2, the decorative skin 5, the automobile interior panel 60 and the airbag cover 9 are provided.
An adhesive layer 2 such as an olefin-based resin may be provided on the back surface of the decorative skin 5 in order to adhere to the decorative skin 1 (FIG. 1). Further, in order to further improve the tactile sensation and flexibility of the decorative skin 5, as shown in FIG. 2, a foam layer 3 may be provided between the decorative skin and the adhesive layer 2. As the foam layer 3, an olefin resin or a urethane resin can be used.
【００２６】[0026]
【発明の実施の形態】本発明の実施形態例は，自動車の
エアバッグ内蔵パネルである。このエアバッグ内蔵パネ
ルは，例えば，インストルメントパネルである。インス
トルメントパネルは，そのエアバッグ収納部にエアバッ
グカバーを設けている。エアバッグカバーの外表面には
装飾用表皮が設けられている。エアバッグカバーは，エ
アバッグ作動時に開裂する（図３，図５参照）。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is a panel with a built-in airbag of an automobile. The airbag built-in panel is, for example, an instrument panel. The instrument panel has an airbag cover in its airbag storage. A decorative skin is provided on the outer surface of the airbag cover. The airbag cover is torn when the airbag is activated (see FIGS. 3 and 5).
【００２７】エアバッグカバーは，ＭＦＲが５〜５０ｇ
／１０分であり，かつ，動的粘弾性ｔａｎδのピーク値
の温度が−３５℃以下の合成樹脂を成形したものである
（試料Ｅ１〜試料Ｅ６）。上記合成樹脂は，ポリプロピ
レン樹脂又はポリエチレン樹脂の一方又は双方からなる
オレフィン系樹脂２０〜８０重量％と，スチレン系共重
合体ゴム又はオレフィン系ランダム共重合体ゴムの一方
又は双方からなるゴム成分８０〜２０重量％とからな
る。The airbag cover has an MFR of 5 to 50 g.
/ 10 minutes, and a synthetic resin having a peak temperature of dynamic viscoelasticity tan δ of −35 ° C. or less was molded (samples E1 to E6). The synthetic resin comprises 20 to 80% by weight of an olefin resin composed of one or both of a polypropylene resin and a polyethylene resin, and a rubber component 80 composed of one or both of a styrene copolymer rubber and an olefin random copolymer rubber. 20% by weight.
【００２８】本例においては，表１に示すごとく，ポリ
プロピレン系樹脂としてはＰＰ−１，ＰＰ−２，ＰＰ−
３を用い，ポリエチレン樹脂としてはＥＯＲ−１，ＥＯ
Ｒ−２，ＥＯＲ−３を用い，スチレン系共重合体ゴムと
してはＳＥＰＳを用い，オレフィン系ランダム共重合体
ゴムとしてはＨＤＰＥを用いた。In this example, as shown in Table 1, PP-1, PP-2 and PP-
3, EOR-1, EO as polyethylene resin
R-2 and EOR-3 were used, SEPS was used as a styrene-based copolymer rubber, and HDPE was used as an olefin-based random copolymer rubber.
【００２９】上記合成樹脂のＭＦＲは，ＪＩＳ−Ｋ６７
５８の規格に準じて測定した。上記合成樹脂の動的粘弾
性ｔａｎδは，レオロジー社「ＤＶＥ−Ｖ４」を用い
て，静歪１００ｇ，動歪１００ｇ（定荷重），周数数２
０Ｈｚの条件下で想定された動的粘弾性ｔａｎδのピー
ク値の温度を記録した。上記装飾用表皮としては，ファ
ブリック貼り表皮を用いた。The MFR of the above synthetic resin is JIS-K67
It was measured according to the 58 standard. The dynamic viscoelasticity tan δ of the synthetic resin was determined by using a rheology company “DVE-V4” and measuring static strain 100 g, dynamic strain 100 g (constant load), number of revolutions 2
The temperature of the peak value of the assumed dynamic viscoelasticity tan δ under the condition of 0 Hz was recorded. As the decorative skin, a fabric-pasted skin was used.
【００３０】上記エアーバッグ内蔵パネルを製造するに
当たっては，まず，２色成形用の金型を用い，そのキャ
ビティ内に，装飾用表皮を配置した（図４参照）。次い
で，一方のゲートからパネル用材料としてＴＰＯを注入
し，エアバッグカバー成形部を除いてキャビティ内をパ
ネル用材料で満たし，硬化させた。次いで，他方のゲー
トから，エアバッグカバー成形用のキャビティ内にエア
バッグ用材料としての上記合成樹脂を注入し，硬化させ
た。これにより，装飾用表皮により被覆されたエアバッ
グ内蔵パネルを得た。In manufacturing the airbag built-in panel, first, a two-color molding die was used, and a decorative skin was arranged in the cavity (see FIG. 4). Next, TPO was injected as a panel material from one of the gates, and the cavity was filled with the panel material except for the airbag cover molding, and cured. Next, the synthetic resin as an airbag material was injected into the cavity for molding the airbag cover from the other gate, and was cured. As a result, an airbag built-in panel covered with a decorative skin was obtained.
【００３１】次に，得られたエアーバッグ内蔵パネルの
表皮ダメージの有無を評価した。装飾用表皮に皺，破れ
等の外観不良がない場合を○と判定し，上記外観不良が
発生した場合を×と判定した。また，上記エアバッグ内
蔵パネルの開裂性能（開裂性）について，評価した。そ
して，設計上，エアバッグカバーにおける開裂すべき所
（例えば，図３の凹所９１１）で開裂して，かつ開裂す
べきでない所では開裂しない場合を合格と判定した。一
方，エアバッグカバーにおける開裂すべき所で開裂せず
に，かつ開裂すべきではない所で開裂した場合を不合格
と判定した。Next, the presence or absence of skin damage of the obtained airbag built-in panel was evaluated. When the decorative skin had no appearance defects such as wrinkles and tears, it was judged as "O", and when the above-mentioned appearance defects occurred, it was judged as "x". In addition, the tearing performance (cleavability) of the airbag built-in panel was evaluated. In the design, a case where the airbag cover was cleaved at a location to be cleaved (for example, the recess 911 in FIG. 3) and not cleaved at a location where it should not be cleaved was determined to be acceptable. On the other hand, a case where the airbag cover did not cleave at the place where the airbag cover should be torn and where the airbag cover did not tear at the place where the airbag cover should not be cleaved was determined to be rejected.
【００３２】なお，比較のために，ＭＦＲが５〜５０ｇ
／１０分の範囲から逸脱し，また，動的粘弾性ｔａｎδ
のピーク値の温度が−３５℃よりも高い合成樹脂からな
るエアバッグカバー（試料Ｃ１〜試料Ｃ３）について
も，同様の測定を行った。For comparison, the MFR was 5 to 50 g.
/ 10 minutes, and dynamic viscoelasticity tanδ
The same measurement was carried out for an airbag cover (sample C1 to sample C3) made of a synthetic resin having a peak temperature of −35 ° C. or higher.
【００３３】上記測定結果を表１に示した。表１より知
られるように，本発明のエアバッグ内蔵パネル（試料Ｅ
１〜試料Ｅ６）は，装飾用表皮の外観が良く，また，開
裂性も良好であった。また，低温時及び高温時の開裂性
能も良好であった。一方，比較例としての試料Ｃ２は，
装飾用表皮の外観が悪かった。また，試料Ｃ１，試料Ｃ
３は，開裂性能が不良であった。Table 1 shows the measurement results. As is known from Table 1, the panel with the built-in airbag of the present invention (sample E
1 to E6) had good appearance of the decorative skin and good tearability. The cleavage performance at low and high temperatures was also good. On the other hand, Sample C2 as a comparative example
The appearance of the decorative skin was poor. Sample C1, Sample C
Sample No. 3 had poor cleavage performance.
【００３４】[0034]
【表１】 [Table 1]
【００３５】[0035]
【表２】 [Table 2]
【００３６】[0036]
【発明の効果】本発明によれば，装飾用表皮にダメージ
を与えることなく，自動車内装パネルとの一体成形が可
能で，かつ耐久性能に優れたエアバッグ内蔵パネルを提
供することができる。According to the present invention, it is possible to provide an airbag built-in panel which can be integrally formed with an automobile interior panel and has excellent durability without damaging the decorative skin.
【図１】本発明における，装飾用表皮と自動車内装パネ
ル及びエアバッグカバーとの接着方法を示す説明図。FIG. 1 is an explanatory view showing a method of bonding a decorative skin to an automobile interior panel and an airbag cover according to the present invention.
【図２】本発明における，装飾用表皮と自動車内装パネ
ル及びエアバッグカバーとの他の接着方法を示す説明
図。FIG. 2 is an explanatory view showing another bonding method of the decorative skin, the automobile interior panel, and the airbag cover in the present invention.
【図３】従来例における，エアバッグ装置の断面説明
図。FIG. 3 is an explanatory sectional view of an airbag device in a conventional example.
【図４】従来例における，エアバッグカバーの成形方法
を示す説明図。FIG. 4 is an explanatory view showing a method of forming an airbag cover in a conventional example.
【図５】従来例における，エアバッグ装置の取付け位置
を示す，インストルメントパネルの正面図。FIG. 5 is a front view of an instrument panel showing a mounting position of an airbag device in a conventional example.
２．．．接着層， ３．．．発泡層， ５．．．装飾用表皮， ６．．．インストルメントパネル， ６０．．．自動車内装パネル， ９１．．．エアバッグカバー， 2. . . 2. adhesive layer; . . Foam layer, 5. . . 5. decorative skin, . . Instrument panel, 60. . . Automotive interior panel, 91. . . Airbag cover,
Claims (2)
エアバッグ作動時に開裂するエアバッグカバーを設けて
なり，かつ，該エアバッグカバーの外表面には，自動車
内装パネルの外表面に連続形成した，装飾用表皮を設け
てなるエアバッグ内蔵パネルにおいて，上記エアバッグ
カバーは，メルトフローレートが５ｇ／１０分〜５０ｇ
／１０分であり，かつ，動的粘弾性ｔａｎδのピーク値
の温度が−３５℃以下の合成樹脂を成形してなり，ま
た，上記合成樹脂は，ポリプロピレン樹脂又はポリエチ
レン樹脂の一方又は双方からなるオレフィン系樹脂２０
〜８０重量％と，スチレン系共重合体ゴム又はオレフィ
ン系ランダム共重合体ゴムの一方又は双方からなるゴム
成分８０〜２０重量％とからなることを特徴とするエア
バッグ内蔵パネル。An airbag cover is provided in an airbag storage portion of an automobile interior panel, the airbag cover being opened when the airbag is activated, and the outer surface of the airbag cover is formed continuously with the exterior surface of the automobile interior panel. In the airbag built-in panel provided with a decorative skin, the airbag cover has a melt flow rate of 5 g / 10 min to 50 g.
/ 10 minutes, and the temperature of the peak value of the dynamic viscoelastic tan δ is −35 ° C. or less. The synthetic resin is made of one or both of a polypropylene resin and a polyethylene resin. Olefin resin 20
An airbag built-in panel comprising 80 to 80% by weight and 80 to 20% by weight of a rubber component composed of one or both of a styrene-based copolymer rubber and an olefin-based random copolymer rubber.
合成皮革，天然皮革，又はファブリックのいずれかであ
ることを特徴とするエアバッグ内蔵パネル。2. The decorative skin according to claim 1,
A panel with a built-in airbag, which is one of synthetic leather, natural leather, and fabric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9090053A JPH10264759A (en) | 1997-03-24 | 1997-03-24 | Panel with built-in airbag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9090053A JPH10264759A (en) | 1997-03-24 | 1997-03-24 | Panel with built-in airbag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10264759A true JPH10264759A (en) | 1998-10-06 |
Family
ID=13987860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9090053A Pending JPH10264759A (en) | 1997-03-24 | 1997-03-24 | Panel with built-in airbag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10264759A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004299508A (en) * | 2003-03-31 | 2004-10-28 | Mitsui Chemicals Inc | Synthetic resin retainer for airbag |
| JP2014172307A (en) * | 2013-03-11 | 2014-09-22 | Toray Ind Inc | Laminate, car interior material, and instrument panel |
| US11623598B2 (en) | 2021-08-24 | 2023-04-11 | Toyoda Gosei Co., Ltd. | Airbag cover |
-
1997
- 1997-03-24 JP JP9090053A patent/JPH10264759A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004299508A (en) * | 2003-03-31 | 2004-10-28 | Mitsui Chemicals Inc | Synthetic resin retainer for airbag |
| JP2014172307A (en) * | 2013-03-11 | 2014-09-22 | Toray Ind Inc | Laminate, car interior material, and instrument panel |
| US11623598B2 (en) | 2021-08-24 | 2023-04-11 | Toyoda Gosei Co., Ltd. | Airbag cover |
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