JPH0790743B2 - Airbag cover and method of manufacturing the same - Google Patents

Airbag cover and method of manufacturing the same

Info

Publication number
JPH0790743B2
JPH0790743B2 JP63262879A JP26287988A JPH0790743B2 JP H0790743 B2 JPH0790743 B2 JP H0790743B2 JP 63262879 A JP63262879 A JP 63262879A JP 26287988 A JP26287988 A JP 26287988A JP H0790743 B2 JPH0790743 B2 JP H0790743B2
Authority
JP
Japan
Prior art keywords
cover
core layer
jis
core
mold
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.)
Expired - Fee Related
Application number
JP63262879A
Other languages
Japanese (ja)
Other versions
JPH01202550A (en
Inventor
重一郎 高田
正美 澤田
勇一 南部
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.)
Takata Corp
Original Assignee
Takata Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Takata Corp filed Critical Takata Corp
Priority to JP63262879A priority Critical patent/JPH0790743B2/en
Publication of JPH01202550A publication Critical patent/JPH01202550A/en
Publication of JPH0790743B2 publication Critical patent/JPH0790743B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
    • B29C37/0057—Moulding single grooves or ribs, e.g. tear lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/215—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member
    • B60R21/2165—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member characterised by a tear line for defining a deployment opening
    • B60R21/21656—Steering wheel covers or similar cup-shaped covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B29L2031/3038—Air bag covers

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は車両衝突時にその衝撃、変形等を感知して展開
するエアバッグを収納するためのカバーの、その製造方
法に関する。TECHNICAL FIELD The present invention relates to a method for manufacturing a cover for accommodating an airbag that deploys by sensing the impact, deformation or the like of a vehicle collision.

［従来の技術］ この種のカバーとして、従来コア層と表皮層とを有した
２層構造のものが知られている。例えば、実公昭56−48
606号にはコア層を低密度ウレタン発泡体とし、表皮層
を高密度ウレタン発泡体としたものが記載されている。[Prior Art] As a cover of this type, a two-layer structure having a core layer and a skin layer has been conventionally known. For example, Jitsuko Sho-48
No. 606 describes a core layer made of a low-density urethane foam and a skin layer made of a high-density urethane foam.

また、実公沼58−49887号には、芯材を内包したパッド
と、このパッドに被着された樹脂製表皮よりなるカバー
が記載されている。さらに、実開昭51−25342号には、
外皮、インサート及び内張よりなるカバーが記載されて
いる。In addition, Japanese Utility Model No. 58-49887 describes a pad including a core material and a cover made of a resin skin attached to the pad. In addition, in No. 51-25342,
A cover consisting of an outer skin, an insert and a lining is described.

［発明が解決しようとする問題点］ 実公昭56−48606号の２層構造のカバーにおいては、表
皮が硬質であるため、車両運転中などに身体の一部が当
ると柔らかみが感じられず、不快感が催される。[Problems to be Solved by the Invention] In the two-layer structure cover of Japanese Utility Model Publication No. 56-48606, since the skin is hard, the softness is not felt when a part of the body is hit while driving the vehicle. , Discomfort occurs.

実公昭58−49887号や実開昭51−25342号においても、同
様の問題があると共に、強化材（心材又はインサートと
称する。）入りの３層構造であるから、製作工数が多
く、また制度良く製造するのが容易ではなく、コスト高
であるという問題がある。In Japanese Utility Model Publication No. 58-49887 and Japanese Utility Model Publication No. 51-25342, there is a similar problem, and since it has a three-layer structure containing a reinforcing material (referred to as a core material or insert), it requires a lot of manufacturing man-hours and a system. There is a problem that it is not easy to manufacture well and the cost is high.

［問題点を解決するための手段］ 本発明のエアバッグ用カバーは、JIS K6301のスプリン
グ硬さHS（JIS A）（以下「硬度JIS A」という。）30〜
70の軟質熱可塑性エラストマーよりなる表皮層と、硬度
JIS A80以上で、A.S.T.M.D2240のジュロメーター硬さHD
（以下「ショアＤ」という。）60以下の弾性を有する硬
質樹脂よりなるコア層又は硬度JIS A80以上で、JIS K72
02のロックウェルＲ硬さHR R（以下「ロックウェルＲ」
という。）60以下の弾性を有しない硬質樹脂よりなるコ
ア層とを一体に成形し、かつ該コア層にはカバー開裂用
のスリットが設けられているものである。[Means for Solving Problems] The airbag cover of the present invention has a JIS K6301 spring hardness HS (JIS A) (hereinafter referred to as “hardness JIS A”) 30 to.
Skin layer made of 70 soft thermoplastic elastomers and hardness
JIS A80 or higher, ASTM D2240 durometer hardness HD
(Hereinafter referred to as "Shore D") A core layer made of a hard resin having elasticity of 60 or less or hardness JIS A80 or more, JIS K72
02 Rockwell R hardness HR R (hereinafter "Rockwell R"
Say. ) A core layer made of a hard resin having an elasticity of 60 or less is integrally molded, and the core layer is provided with a slit for cleaving the cover.

また、本発明のエアバッグ用カバーの製造方法は、スリ
ット形成用の凸条を備えたコア型と１次方との間にコア
層形成用の材料を射出して開裂用スリット付のコア層を
形成し、次いで１次型をコア層から引い離す工程、及び
コア型に保持されたコア層に２次型を被装し、コア型と
２次型との間に表皮層形成用の材料を射出する工程によ
り、上記エアバッグ用カバーを製造するものである。Further, in the method for manufacturing an airbag cover of the present invention, the core layer forming material is injected between the core mold having the ridges for slit formation and the primary side to form the core layer with the slit for cleavage. And then removing the primary mold from the core layer, and by covering the core layer held by the core mold with the secondary mold, a material for forming a skin layer between the core mold and the secondary mold. The airbag cover is manufactured by the step of injecting.

［作用］ かかる本発明のエアバッグ用カバーにおいては、硬質な
コア層が軟質な熱可塑性エラストマー外皮で被われてい
るから、該カバーに身体が当っても柔らかみがあり、不
快に感じない。また、コア層が硬質であるから、多少の
外力が作用してもカバーが変形したり損壊したりするこ
とがない。[Operation] In the airbag cover of the present invention, since the hard core layer is covered with the soft thermoplastic elastomer skin, the cover is soft and does not feel uncomfortable even when the body is hit. Further, since the core layer is hard, the cover will not be deformed or damaged even if some external force is applied.

また、本発明のカバーは、車両衝突時等にあってカバー
内のバッグが膨張した際に、スリットに沿ってカバーが
開裂するものであるが、このカバー開裂時において、硬
質なコア層が外皮によって密着して被われているので、
カバーの開裂破片が飛散しない。Further, the cover of the present invention is such that the cover is split along the slit when the bag in the cover is inflated at the time of a vehicle collision or the like. Because it is tightly covered by
The split pieces of the cover do not scatter.

［実施例］ 以下図面に示す実施例を参照しながら本発明についてさ
らに詳細に説明する。Embodiments The present invention will be described in more detail with reference to the embodiments shown in the drawings.

第１図は本発明の１実施例に係るエアバッグ用カバーの
断面図（第２図のＩ−Ｉ線に沿う断面図）、第２図
（ａ）（ｂ）は同エアバッグ用カバーの平面図である。1 is a sectional view of an airbag cover according to an embodiment of the present invention (a sectional view taken along the line I-I of FIG. 2), and FIGS. 2 (a) and 2 (b) are the same. It is a top view.

このエアバッグ用カバー１は、硬度JIS A30〜70の軟質
熱可塑性エラストマーよりなる表皮層２と、硬度JIS A8
0以上でショアD60以下の弾性を有する硬質樹脂よりなる
コア層３とを一体に成形したものである。又、コア層
は、硬度JIS A80以上でロックウェルR60以下の弾性を有
しない硬質樹脂、例えばポリプロピレン樹脂等であって
もよい。コア層３には、開裂用のスリット４が設けられ
ており、また該コア層と前記表皮層２とを貫通してボル
トやリベット等の挿通孔が穿設されている。この孔５
は、エアバッグ用カバー１をリテーナ（図示せず）に連
結するためのものである。本実施例では、コア層３の縁
部には外方に向かって突出するリブ６が設けられてお
り、該カバー１の外面に鉄板等を当ててリベットやボル
トで止め付ける際の該鉄板等の係止を行なっている。The airbag cover 1 includes a skin layer 2 made of a soft thermoplastic elastomer having a hardness of JIS A30 to 70 and a hardness of JIS A8.
The core layer 3 made of a hard resin having elasticity of 0 or more and Shore D60 or less is integrally formed. Further, the core layer may be made of a hard resin having hardness of JIS A80 or more and not having elasticity of Rockwell R60 or less, such as polypropylene resin. The core layer 3 is provided with slits 4 for cleaving, and insertion holes such as bolts and rivets are bored through the core layer and the skin layer 2. This hole 5
Is for connecting the airbag cover 1 to a retainer (not shown). In this embodiment, ribs 6 are provided at the edge of the core layer 3 so as to project outward, and an iron plate or the like is applied to the outer surface of the cover 1 to secure the plate with rivets or bolts. Is locked.

このように構成されたエアバッグ用カバー１は、その内
部にエアバッグが収容され、車両衝突時等の衝撃により
エアバッグが膨張すると、スリット４に沿って開裂し、
バッグが速やかに膨張して乗員の保護をなす。特に、本
実施例ではスリット４が表皮層２に達するように設けら
れているから、開裂がより確実に行なわれる。The airbag cover 1 configured in this manner has an airbag accommodated therein, and when the airbag is inflated due to a shock such as a vehicle collision, the airbag cover 1 is split along the slit 4,
The bag quickly inflates to protect the occupants. In particular, in this embodiment, the slit 4 is provided so as to reach the skin layer 2, so that the cleavage is performed more reliably.

しかして、このカバー１においては、表皮層２が軟質な
熱可塑性エラストマーよりなるから、このカバー１の開
裂に際して硬質なコア層３が破片状となって飛散するこ
とが防止される。即ち、カバー１の開裂によりコア層３
には多数の亀裂が生じ、飛散しようとするが、表皮層２
は軟質であるがゆえに小片までには断裂せず、小片状に
なったコア層破片を保持し、その飛散を防止するのであ
る。Since the skin layer 2 of the cover 1 is made of a soft thermoplastic elastomer, it is possible to prevent the hard core layer 3 from being scattered like fragments when the cover 1 is cleaved. That is, by cleaving the cover 1, the core layer 3
There are many cracks in the surface and they try to scatter, but the skin layer 2
Because of its softness, it does not break up into small pieces, but holds the pieces of the core layer in the form of small pieces and prevents their scattering.

また、この表皮層２は軟質な熱可塑性エラストマーより
なるから、車両の乗員の身体の一部がカバー１に当って
も、柔かみがあり快適感に優れる。Further, since the skin layer 2 is made of a soft thermoplastic elastomer, even if a part of the body of the vehicle occupant hits the cover 1, the skin layer 2 is soft and comfortable.

本発明において、表皮層を構成する軟質な熱可塑性エラ
ストマーのJIS硬度Ａが70よりも大であると、上記のよ
うな当りの柔かさや開裂時のコア層飛散防止効果が乏し
い。逆にJIS硬度Ａが30よりも低いと、過度に軟質にな
り、耐久性に乏しくなる。In the present invention, when the JIS hardness A of the soft thermoplastic elastomer constituting the skin layer is larger than 70, the softness of the hit as described above and the effect of preventing the core layer from scattering during cleavage are poor. On the other hand, when the JIS hardness A is lower than 30, it becomes excessively soft and poor in durability.

また、コア層３を構成する硬質の樹脂のJIS硬度Ａが80
よりも低いと、その硬度が不足し、カバー１が変形し易
くなる。ショアＤが60よりも大であるか、又はロックウ
ェルＲが60よりも大であると、低温時に更に硬くなって
開裂時にバッグを裂傷するおそれがある。The JIS hardness A of the hard resin that constitutes the core layer 3 is 80.
If it is lower than the above range, the hardness is insufficient and the cover 1 is easily deformed. If the Shore D is larger than 60 or the Rockwell R is larger than 60, the bag may be further hardened at a low temperature and the bag may be torn at the time of tearing.

本発明においては、コア層の強度が高いので、薄肉であ
ってもカバーに所要の強度を付与するようになり、カバ
ー全体として薄肉化できる。そのため、車両内における
エアバッグ用カバーの設置占有スペースが小さく足りる
ようになる。さらに、コア層が十分に強度の高い硬質の
ものであるから、内部に収容したバッグの形状がカバー
の外部に言われず、見栄えも良い。In the present invention, since the strength of the core layer is high, the cover can be provided with required strength even if it is thin, and the cover as a whole can be made thin. Therefore, the space occupied by the airbag cover in the vehicle can be made small. Further, since the core layer is hard and has a sufficiently high strength, the shape of the bag housed inside is not told to the outside of the cover and the appearance is good.

このようなエアバッグ用カバーは、第３図に示す装置及
び方法（２色成形法）により容易に製造することができ
る。第３図において符号10は回転テーブルであり、回転
軸11を介して駆動装置12により軸心回りに回動可能とさ
れている。そして、この回転軸11を挾んで２個のコア型
13が回転テーブル10上に配置されており、該コア型13に
被せられる１次型14と２次型15が回転テーブル10の上方
に設置されている。１次型14と２次型15はそれぞれホル
ダ16、17に取り付けられており、これらホルダ16、17は
ロッド18、19を介して昇降装置（図示せず）に連結さ
れ、該昇降装置により昇降駆動可能とされている。ま
た、１次型14と２次型15にはそれぞれノズル20、21を介
して射出用のシリンダ22、23から樹脂が射出可能とされ
ている。Such an airbag cover can be easily manufactured by the apparatus and method (two-color molding method) shown in FIG. In FIG. 3, reference numeral 10 is a rotary table, which is rotatable around a shaft center by a drive device 12 via a rotary shaft 11. And, with this rotating shaft 11 sandwiched, two core types
13 is arranged on the rotary table 10, and a primary mold 14 and a secondary mold 15 which cover the core mold 13 are installed above the rotary table 10. The primary mold 14 and the secondary mold 15 are attached to holders 16 and 17, respectively, and these holders 16 and 17 are connected to an elevating device (not shown) via rods 18 and 19, and the elevating device elevates and lowers them. It can be driven. Resin can be injected into the primary mold 14 and the secondary mold 15 from the injection cylinders 22 and 23 via the nozzles 20 and 21, respectively.

このように構成された竪型二色成形機による成形手順を
次に説明する。A molding procedure by the vertical two-color molding machine configured as described above will be described below.

まず、ホルダ16が下降され、１次型14がコア型13に
被せられる。そして、シリンダ22からノズル20を介して
１次型14とコア型13との間のキャビティに硬質樹脂材料
が射出される。First, the holder 16 is lowered and the primary mold 14 is put on the core mold 13. Then, the hard resin material is injected from the cylinder 22 through the nozzle 20 into the cavity between the primary mold 14 and the core mold 13.

次いで、ホルダ16が上昇される。 Then, the holder 16 is raised.

回転テーブル10が半回転し、硬質樹脂が射出された
コア型13が２次型15の下方に移動される。The rotary table 10 rotates half a turn, and the core mold 13 injected with the hard resin is moved below the secondary mold 15.

そこで、ホルダ17が下降されて２次型15がコア型13
に被せられ、該コア型13に被着している硬質樹脂と２次
型15との間のキャビティに軟質熱可塑性エラストマーが
ノズル21を介してシリンダ23から射出される。Then, the holder 17 is lowered so that the secondary mold 15 becomes the core mold 13.
The soft thermoplastic elastomer is injected from the cylinder 23 through the nozzle 21 into the cavity between the secondary mold 15 and the hard resin that is covered with the core mold 13.

次に、ホルダ17が上昇され、２次型15がコア型13か
ら引き離される。Next, the holder 17 is lifted and the secondary mold 15 is separated from the core mold 13.

コア型13から成形品を取り出す。 Remove the molded product from the core mold 13.

この工程を順次繰返すことにより、エアバッグ用カバー
を連続的に成形することができる。By repeating this step in sequence, the airbag cover can be continuously molded.

なお、一方のコア型13の２次型15が被せられ、シリンダ
23から軟質熱可塑性エラストマーが射出されている間
に、他方のコア型13には１次型14が被せられ、シリンダ
22から硬質樹脂材料が射出されている。図示の装置は堅
型多色成形機であるが、横型であっても良い。また、上
記説明では硬質樹脂材料が先に射出され、軟質熱可塑性
エラストマーが後から射出されているが、逆に軟質熱可
塑性エラストマーを先に射出し、硬質樹脂材料を後から
射出するようにしても良い。The secondary mold 15 of one core mold 13 is put on and
While the soft thermoplastic elastomer is being injected from 23, the other core mold 13 is covered with the primary mold 14,
Hard resin material is injected from 22. Although the illustrated apparatus is a rigid multicolor molding machine, it may be a horizontal type. Further, in the above description, the hard resin material is injected first, and the soft thermoplastic elastomer is injected later, but on the contrary, the soft thermoplastic elastomer is injected first, and the hard resin material is injected later. Is also good.

第４図は本発明の別の実施例に係るエアバッグ用カバー
要部断面図である。第４図の実施例に係るカバー１は、
表皮層２とコア層３との付着性が低い場合に係るもので
ある。FIG. 4 is a sectional view of an essential part of an airbag cover according to another embodiment of the present invention. The cover 1 according to the embodiment of FIG.
This relates to the case where the adhesion between the skin layer 2 and the core layer 3 is low.

本実施例では、コア層３に、厚味方向に貫通する貫通孔
3aが多数穿設されており、表皮層２を構成する軟質熱可
塑性エラストマーの一部は該貫通孔3aを通過してカバー
１の内面に露出し、かつここにおいて拡大部2aを形成
し、これによって表皮層２とコア層３とを主として機械
的に結合している。このように表皮層２の一部をコア層
３な貫通させることにより、軟質熱可塑性エラストマー
と硬質樹脂材料との付着性が低い場合であっても表皮層
２とコア層３とを強固に一体化させることが可能であ
る。In this embodiment, the core layer 3 has a through hole penetrating in the thickness direction.
A large number of 3a are bored, and a part of the soft thermoplastic elastomer constituting the skin layer 2 passes through the through holes 3a and is exposed on the inner surface of the cover 1, and the enlarged portion 2a is formed therein. The skin layer 2 and the core layer 3 are mainly mechanically coupled with each other. By thus penetrating a part of the skin layer 2 through the core layer 3, the skin layer 2 and the core layer 3 are firmly integrated even if the adhesion between the soft thermoplastic elastomer and the hard resin material is low. It is possible to make it.

なお、本発明においてては表皮層とコア層とはいかなる
環境下、例えば−40℃〜＋105℃の間にあっても、開裂
した際にコア層が飛散しないように、コア層と表皮層と
が十分な付着ないし結合力をもって結合しているのが好
ましい。In addition, in the present invention, the core layer and the skin layer are sufficient so that the core layer does not scatter when cleaved under any environment, for example, between −40 ° C. and + 105 ° C. under any environment. It is preferable that they are bound with each other with good adhesion or binding force.

本発明において、表皮材を構成する軟質熱可塑性エラス
トマーとしては各種のものを用いることができる。これ
にゴム等を配合しても良い。また、コア層を構成する硬
質樹脂としては各種の合成樹脂が好適である。In the present invention, various types can be used as the soft thermoplastic elastomer constituting the skin material. You may mix | blend rubber etc. with this. Further, various synthetic resins are suitable as the hard resin forming the core layer.

第１図及び第２図（ａ）（ｂ）においては、略正方形状
のカバー１が示されているが、本発明においてはカバー
の形状は長方形、六角形、円形、楕円形等各種形状とし
得る。また、スリットは、第２図（ａ）では十字形状、
第２図（ｂ）ではＨ字形状に設けられているが、カバー
の確実な開裂を行なうことができる限り図示以外の形状
に設けても良く、例えばＴ字形、Ｙ字形、コ字形あるい
は放射状に設けても良い。1 and 2 (a) and (b), the cover 1 having a substantially square shape is shown, but in the present invention, the shape of the cover is various shapes such as rectangular, hexagonal, circular and elliptical. obtain. Further, the slit has a cross shape in FIG.
Although it is provided in an H shape in FIG. 2 (b), it may be provided in a shape other than that shown as long as the cover can be reliably cleaved, for example, in a T shape, a Y shape, a U shape, or a radial shape. It may be provided.

以下に具体的な実施例及び比較例を挙げて、本発明をよ
り詳細に説明する。Hereinafter, the present invention will be described in more detail with reference to specific examples and comparative examples.

実施例１〜10,比較例１〜10 第３図に示す二色成形機を用い、表1,2に示す材料にて
前述の成形手順〜に従って、第１図及び第２図
（ａ），（ｂ）に示すエアバッグ用カバーを製造した。Examples 1 to 10 and Comparative Examples 1 to 10 Using the two-color molding machine shown in FIG. 3 and using the materials shown in Tables 1 and 2 in accordance with the above-mentioned molding procedure, the results are shown in FIGS. 1 and 2 (a), The airbag cover shown in (b) was manufactured.

なお、表皮層の厚さは2.5mm,コア層の厚さは3.0mmとし
た。また、カバー開裂用のスリットは深さ2.5mmで、幅
4.0mmとした。The skin layer had a thickness of 2.5 mm and the core layer had a thickness of 3.0 mm. The slit for tearing the cover has a depth of 2.5 mm and a width of
It was 4.0 mm.

得られたカバーについて、下記方法により特性の評価を
行い、結果を表1,2に示した。The characteristics of the obtained cover were evaluated by the following methods, and the results are shown in Tables 1 and 2.

感触 手で触れた時の感触を調べ、下記基準で評価した。 Feeling Feeling when touched with hands was examined and evaluated according to the following criteria.

×：硬くて不快 ○：軟質で快適 ◎：軟質で非常に快適 耐応力性 上方50cmの位置から1.0kgの重りを落下させ、カバーの
変性、損壊の有無を調べ、下記基準で評価した。×: Hard and uncomfortable ○: Soft and comfortable ◎: Soft and very comfortable Stress resistance A 1.0 kg weight was dropped from a position 50 cm above, and the presence or absence of degeneration and damage of the cover was examined and evaluated according to the following criteria.

×：損壊 △：変形 ○：変形なく良好 ◎：変形なく非常に良好 ◎：変形なく著しく良好 開裂性 インフレータを用いた開裂テストを行い、85℃及び低温
の−30℃でそれぞれ開裂状態を調べ、下記基準で評価し
た。×: Destruction Δ: Deformation ○: Good without deformation ◎: Very good without deformation ◎: Remarkably good without deformation Cleavability A cleavage test was performed using an inflator, and the cleavage state was examined at 85 ° C and low temperature of -30 ° C. The following criteria evaluated.

×：開裂せず △：開裂するが不十分 ○：円滑に開裂する。X: No cleavage Δ: Cleavage is insufficient ○: Smooth cleavage

◎：非常に円滑に開裂する。⊚: Cleaves very smoothly.

◎：著しく円滑に開裂する。⊚: Cleaving is extremely smooth.

表1,表２より、本発明によれば、感触、耐応力性、開裂
性がいずれも著しく良好なエアバッグ用カバーが提供さ
れることが明らかである。 From Tables 1 and 2, it is clear that the present invention provides an airbag cover which is remarkably good in feel, stress resistance and tearability.

［効果］ 以上の通り、本発明のカバーは、表皮材が軟質であるの
で身体の一部が当っても柔らかみがあるため、快適感が
高い。また、この軟質な表皮層によりカバーの開裂時の
コア層の飛散が確実に防止される。[Effects] As described above, the cover of the present invention has a soft feeling of comfort because the skin material is soft and therefore soft even if a part of the body is hit. Further, the soft skin layer surely prevents the core layer from scattering when the cover is split.

本発明のカバーにおいては、内装が硬質のコアからな
り、強度も十分に高いので薄肉化し得る。また、バッグ
を確実に保持することができ、折りたたまれて収納され
たバッグの凹凸がカバー表面に現れないという効果も有
する。In the cover of the present invention, the interior is made of a hard core and has sufficiently high strength, so that the cover can be made thin. In addition, the bag can be held securely, and the unevenness of the folded and stored bag does not appear on the cover surface.

本発明のカバーは二色成形法等の成形法により容易かつ
確実に製造することができる。The cover of the present invention can be easily and reliably manufactured by a molding method such as a two-color molding method.

【図面の簡単な説明】[Brief description of drawings]

第１図は本発明の実施例に係るカバーの断面図、第２図
（ａ），（ｂ）は同平面図、第３図はカバーの製造方法
を説明する側面図、第４図は異なる実施例に係るカバー
の要部断面図である。 １……エアバッグ用カバー、２……表皮層、 ３……コア層、４……スリット、 10……回転テーブル、13……コア型。FIG. 1 is a sectional view of a cover according to an embodiment of the present invention, FIGS. 2 (a) and 2 (b) are the same plan views, FIG. 3 is a side view illustrating a method of manufacturing the cover, and FIG. 4 is different. It is a principal part sectional drawing of the cover which concerns on an Example. 1 ... Airbag cover, 2 ... Skin layer, 3 ... Core layer, 4 ... Slit, 10 ... Rotating table, 13 ... Core type.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭52−116537（ＪＰ，Ａ) 実開 昭51−25342（ＪＰ，Ｕ) 実公 昭56−48606（ＪＰ，Ｙ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-116537 (JP, A) Actual development S.A. 51-25342 (JP, U) Actual publication S.A. 56-48606 (JP, Y2)

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】JIS K6301のスプリング硬さHS（JIS
Ａ）30〜70の軟質熱可塑性エラストマーよりなる表皮層
と、該スプリング硬さHS（JIS Ａ）80以上で、A.S.T.
M.D2240のジュロメーター硬さHD60以下の弾性を有する
硬質樹脂よりなるコア層とが一体に成形され、かつ該コ
ア層にはカバー開裂用のスリットが設けられているエア
バッグ用カバー。[Claim 1] JIS K6301 spring hardness HS (JIS
A) A skin layer made of a soft thermoplastic elastomer of 30 to 70 and a spring hardness HS (JIS A) of 80 or more, and AST
An airbag cover in which a core layer made of a hard resin having elasticity of M.D2240 durometer hardness HD60 or less is integrally formed, and a slit for splitting the cover is provided in the core layer. 【請求項２】スリット形成用の凸条を備えたコア型と１
次型との間にコア層形成用の材料を射出して開裂用スリ
ット付のコア層を形成し、次いで１次型をコア層から引
き離す工程、及び、 コア型に保持されたコア層に２次型を被装し、コア型と
２次型との間に表皮層形成用の材料を射出する工程によ
り、 JIS K6301のスプリング硬さHS（JIS Ａ）30〜70の軟
質熱可塑性エラストマーよりなる表皮層と、該スプリン
グ硬さHS（JIS Ａ）80以上で、A.S.T.M.D2240のジュロ
メーター硬さHD60以下の弾性を有する硬質樹脂よりなる
コア層とが一体に成形され、かつ該コア層にはカバー開
裂用のスリットが設けられているカバーを製造すること
を特徴とするエアバッグ用カバーの製造方法。2. A core mold having a ridge for slit formation and 1
A step of injecting a material for forming a core layer with a next die to form a core layer with a slit for cleavage, and then separating the primary die from the core layer, and a step of removing the core layer held by the core die by 2 Made of a soft thermoplastic elastomer of JIS K6301 spring hardness HS (JIS A) 30 to 70 by the process of covering the next mold and injecting the material for forming the skin layer between the core mold and the secondary mold. A skin layer and a core layer made of a hard resin having spring hardness HS (JIS A) of 80 or more and elasticity of ASTM D2240 durometer hardness of HD60 or less are integrally formed, and a cover is cleaved on the core layer. A method of manufacturing a cover for an airbag, comprising manufacturing a cover provided with a slit for use in the airbag. 【請求項３】JIS K6301のスプリング硬さHS（JIS
Ａ）30〜70の軟質熱可塑性エラストマーよりなる表皮層
と、該スプリング硬さHS（JIS Ａ）80以上でJIS K720
2のロックウェルＲ硬さHR R60以下の弾性を有しない硬
質樹脂よりなるコア層とが一体に成形され、かつ該コア
層にはカバー開裂用のスリットが設けられているエアバ
ッグ用カバー。[Claim 3] JIS K6301 spring hardness HS (JIS
A) A skin layer made of a soft thermoplastic elastomer of 30 to 70 and JIS K720 with a spring hardness HS (JIS A) of 80 or more.
2. An airbag cover in which a core layer made of a hard resin having a Rockwell R hardness of HR R60 or less and having no elasticity is integrally formed, and a slit for splitting the cover is provided in the core layer. 【請求項４】スリット形成用の凸条を備えたコア型と１
次型との間にコア層形成用の材料を射出して開裂用スリ
ット付のコア層を形成し、次いで１次型をコア層から引
き離す工程、及び、 コア型に保持されたコア層に２次型を被装し、コア型と
２次型との間に表皮層形成用の材料を射出する工程によ
り、 JIS K6301のスプリング硬さHS（JIS Ａ）30〜70の軟
質熱可塑性エラストマーよりなる表皮層と、該スプリン
グ硬さHS（JIS Ａ）80以上でJIS K7202のロックウェ
ルＲ硬さHR R60以下の弾性を有しない硬質樹脂よりな
るコア層とが一体に成形され、かつ該コア層にはカバー
開裂用のスリットが設けられているカバーを製造するこ
とを特徴とするエアバッグ用カバーの製造方法。4. A core mold having a ridge for slit formation and 1
A step of injecting a material for forming a core layer with a next die to form a core layer with a slit for cleavage, and then separating the primary die from the core layer, and a step of removing the core layer held by the core die by 2 Made of a soft thermoplastic elastomer of JIS K6301 spring hardness HS (JIS A) 30 to 70 by the process of covering the next mold and injecting the material for forming the skin layer between the core mold and the secondary mold. A skin layer and a core layer made of a hard resin having a spring hardness of HS (JIS A) of 80 or more and a Rockwell hardness of JIS K7202, R hardness of HR R60 or less and having no elasticity are integrally molded, and the core layer is formed. Is a method for manufacturing an airbag cover, which comprises manufacturing a cover provided with a slit for cleaving the cover.
JP63262879A 1987-10-21 1988-10-20 Airbag cover and method of manufacturing the same Expired - Fee Related JPH0790743B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63262879A JPH0790743B2 (en) 1987-10-21 1988-10-20 Airbag cover and method of manufacturing the same

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP26399787 1987-10-21
JP62-263997 1987-10-21
JP63262879A JPH0790743B2 (en) 1987-10-21 1988-10-20 Airbag cover and method of manufacturing the same

Publications (2)

Publication Number Publication Date
JPH01202550A JPH01202550A (en) 1989-08-15
JPH0790743B2 true JPH0790743B2 (en) 1995-10-04

Family

ID=26545754

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63262879A Expired - Fee Related JPH0790743B2 (en) 1987-10-21 1988-10-20 Airbag cover and method of manufacturing the same

Country Status (1)

Country Link
JP (1) JPH0790743B2 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0490448U (en) * 1990-02-01 1992-08-06
JPH03258634A (en) * 1990-03-09 1991-11-18 Asahi Chem Ind Co Ltd Air bag housing cover
JP2539939B2 (en) * 1990-05-24 1996-10-02 タカタ 株式会社 Cover for airbag storage
JP2906584B2 (en) * 1990-05-24 1999-06-21 タカタ株式会社 Airbag storage cover
JP2956137B2 (en) * 1990-06-20 1999-10-04 タカタ株式会社 Module cover for airbag device
KR920009637A (en) * 1990-11-13 1992-06-25 다카다 쥬우이찌로오 Molding method of module cover of airbag device
CA2056206C (en) * 1990-11-29 1996-02-06 Norio Onofusa Cover for accomodating air bag in air bag system
JPH0645150B2 (en) * 1991-07-23 1994-06-15 日本プラスト株式会社 Airbag storage cover
JP3020807B2 (en) * 1994-07-22 2000-03-15 三菱化学株式会社 Airbag storage cover
JP3466322B2 (en) * 1995-04-24 2003-11-10 カルソニックカンセイ株式会社 Vehicle airbag cover and molding method thereof
WO1998019893A1 (en) * 1996-11-07 1998-05-14 Toyota Jidosha Kabushiki Kaisha Arrangement and construction of crew protective device for automobile
KR20010013798A (en) * 1997-06-16 2001-02-26 게리 엠. 코인 Decorative automotive interior trim articles with cast integral light stable covering containing an invisible tear seam and process for making the same
JP3370044B2 (en) * 1999-06-03 2003-01-27 東海化成工業株式会社 Skin, manufacturing method thereof, manufacturing method of airbag door skin, and airbag door structure
EP1101795B1 (en) 1999-11-18 2005-03-02 Mitsubishi Chemical Corporation Air bag cover for vehicles
JP2003040067A (en) * 2001-07-26 2003-02-13 Shigeru Co Ltd Interior surface skin for vehicle
DE10231131C5 (en) 2002-07-10 2020-01-09 Lisa Dräxlmaier GmbH Dashboard for a vehicle
EP2258771B1 (en) 2008-03-25 2012-10-31 Asahi Kasei Chemicals Corporation Elastomer composition and storage cover for airbag system

Also Published As

Publication number Publication date
JPH01202550A (en) 1989-08-15

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