JP2010082903A - Method for bonding vulcanized rubber sheet - Google Patents

Method for bonding vulcanized rubber sheet Download PDF

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Publication number
JP2010082903A
JP2010082903A JP2008252746A JP2008252746A JP2010082903A JP 2010082903 A JP2010082903 A JP 2010082903A JP 2008252746 A JP2008252746 A JP 2008252746A JP 2008252746 A JP2008252746 A JP 2008252746A JP 2010082903 A JP2010082903 A JP 2010082903A
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Prior art keywords
vulcanized rubber
sheets
joining
sheet
fusion
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Japanese (ja)
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Atsushi Nakabayashi
敦 中林
Yoshitaka Higashida
義孝 東田
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Mitsuboshi Belting Ltd
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Mitsuboshi Belting Ltd
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Priority to JP2008252746A priority Critical patent/JP2010082903A/en
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    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/40—Applying molten plastics, e.g. hot melt
    • B29C65/42—Applying molten plastics, e.g. hot melt between pre-assembled parts
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for bonding a vulcanized rubber sheet, in which the bonding of sheets can be carried out by arranging a fusion material at the end of an overlapped part in the sheet in the same way as a sheet consisting of a thermoplastic resin in bonding the vulcanized rubber sheets. <P>SOLUTION: While the fusion material 5 comprising the thermoplastic resin is melt-extruded in a state that the ends of the vulcanized rubber sheets 1a and 1b are mutually overlapped, the molten fusion material 5 is arranged so as to step over both sheets in the end 4 in which the vulcanized rubber sheets 1a and 1b are overlapped, to bond the vulcanized rubber sheets mutually. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、建築物の屋上等に敷設される一般的に防水シートと呼ばれるシートや、廃棄物処分場や貯水池等に用いられる遮水シートと呼ばれるシートであって、加硫ゴムからなっているもののシート同士の接合方法に係り、シート同士の接合を熱可塑性材料からなる融着材を用いることによって熱融着にて接合する方法に関する。   The present invention is a sheet generally called a waterproof sheet laid on the rooftop of a building or the like, and a sheet called a water shielding sheet used in a waste disposal site or a reservoir, and is made of vulcanized rubber. In particular, the present invention relates to a method for joining sheets by heat fusion by using a fusion material made of a thermoplastic material.

従来から、建築物の屋上の防水工、また廃棄物処分場において廃棄物からの汚水が土壌に浸透して土壌を汚染してしまうことのないように、防水シートや遮水シートを敷設して水を遮断するといったことが行われている。   Conventionally, waterproof sheets and water shielding sheets have been installed so that the sewage from the waste will not penetrate into the soil and contaminate the soil at the waste disposal site or at the waste disposal site. Something such as blocking the water is done.

それらのシートの素材として樹脂からなるシートや加硫ゴムからなるシートを挙げることができる。シート同士を接合する方法として、シートの重ね合わせ部に接着剤を塗布して接合する方法がある。接着剤による接合は、塗布量が十分であれば接合不良が発生しにくいといった長所があるものの、接合強度を発現するまでに比較的長い時間を要する。よって、十分な強度が出るまでに不慮の事故で接合部がずれたり剥がれてしまうといったことが起こる可能性もあり、そうすると十分な接合強度を得られなくなってしまう。   Examples of the material for these sheets include a sheet made of resin and a sheet made of vulcanized rubber. As a method of joining sheets, there is a method of joining by applying an adhesive to the overlapping portion of the sheets. Bonding with an adhesive has the advantage that bonding failure is less likely to occur if the coating amount is sufficient, but it takes a relatively long time to develop bonding strength. Therefore, there is a possibility that the joint portion may be shifted or peeled off due to an accident before the sufficient strength is obtained, so that sufficient joint strength cannot be obtained.

また、熱による融着といった方法もある。こちらは、加熱して融着するものであるが、温度が下がってしまえば直ちに十分な接合強度を得ることができ、接着剤による接合と比べて接合作業から接合強度を発現するまでの時間が短い。しかし、接合面を熱風等で炙る作業はある程度の慣れを要し、炙る時間が短すぎると接合不良になり、長すぎるとシートの強度低下といった問題につながる。   There is also a method such as fusion by heat. This is one that is fused by heating, but if the temperature drops, it is possible to obtain sufficient bonding strength immediately, and the time from the bonding operation to the development of bonding strength compared to bonding with an adhesive. short. However, the work of scoring the joint surface with hot air or the like requires a certain amount of familiarity. If the sprinkling time is too short, the joint is poor, and if it is too long, the strength of the sheet is reduced.

それ以外に塩化ビニル樹脂やポリエチレンといった熱可塑性樹脂からなるシート同士を重ね合わせた小口に熱可塑性材料からなる融着材を両方のシートにまたがるように配置して接合するといった方法がある。   In addition to this, there is a method in which a fusion material made of a thermoplastic material is arranged so as to straddle both sheets and bonded to a fore edge where sheets made of a thermoplastic resin such as vinyl chloride resin or polyethylene are overlapped.

特開平７−２６６４２６号公報JP-A-7-266426 特開２００１−４０６４０号公報JP 2001-40640 A

シート同士の重ね合わせた小口に融着材を配置して、両者を接合する方法であると、熱融着による接合なので、融着材の温度が下がると直ちに接合強度を発現する。また、重ね合わせたシートをめくって熱風等で炙る作業はなく、シートの上から融着材を供給する作業となるので、接合不良が起こる可能性も低い方法であるということができる。   In the method of disposing the fusing material in the small edge where the sheets are overlapped and joining the two, since the fusing material is joined by heat fusion, the bonding strength is immediately developed when the temperature of the fusing material is lowered. Further, there is no work of turning over the overlapped sheets with hot air or the like, and the work of supplying the fusion material from the top of the sheets, so that it can be said that the possibility of poor bonding is low.

そこで、本発明では、加硫ゴムシートを接合する際に熱可塑性樹脂からなるシートと同様にシートの重ね合わせ部の小口に融着材を配置することでシートの接合を行うことができる加硫ゴムシートの接合方法の提供を目的とする。   Therefore, in the present invention, when the vulcanized rubber sheet is joined, the vulcanization capable of joining the sheets by disposing a fusion material in the edge of the overlapping portion of the sheets in the same manner as the sheet made of the thermoplastic resin. It aims at providing the joining method of a rubber sheet.

以上のような目的を達成するために本発明の請求項１では、加硫ゴムシートの接合方法において、該シートの端部同士を重ね合わせた状態で、熱可塑性材料からなる融着材を溶融押出ながら、前記加硫ゴムシートの重ね合わせ部分の小口において両方のシートにまたがるように、前記溶融した融着材を配置して加硫ゴムシート同士を接合してなることを特徴とする。   In order to achieve the above object, in claim 1 of the present invention, in the method for joining vulcanized rubber sheets, a fusion material made of a thermoplastic material is melted in a state where the ends of the sheets are overlapped with each other. It is characterized in that the vulcanized rubber sheets are joined together by placing the melted fusion material so as to straddle both sheets at the edge of the overlapped portion of the vulcanized rubber sheets while extruding.

請求項２では、融着材を構成する熱可塑性材料がエチレンエチルアクリレート、エチレンビニルアセテート、サーモプラスチックオレフィンから選ばれてなく少なくとも一種である請求項１記載の加硫ゴムシートの接合方法としている。   According to a second aspect of the present invention, the method for joining vulcanized rubber sheets according to the first aspect, wherein the thermoplastic material constituting the fusing material is not selected from ethylene ethyl acrylate, ethylene vinyl acetate, and thermoplastic olefin.

請求項３では、融着材には紫外線吸収剤を配合してなる請求項１もしくは２のいずれかに記載の加硫ゴムシートの接合方法としている。   In Claim 3, it is set as the bonding | joining method of the vulcanized rubber sheet in any one of Claim 1 or 2 formed by mix | blending an ultraviolet absorber with a fusion material.

本発明の請求項１では、加硫ゴムシートの接合方法であって、シート同士を重ね合わせた小口に、押出機で溶融押出した融着材を配置して、該融着材によりシートを接合を行っていることから、まず、熱融着による接合であり、接合作業後にすぐに接合強度を発現するものであり、溶融押出した融着材を小口に配置する作業となるので、接合不良の問題も起こりにくい接合方法を加硫ゴムシートにおいて行うことができる。   According to claim 1 of the present invention, there is provided a method for joining vulcanized rubber sheets, in which a fusion material melt-extruded by an extruder is disposed in a small edge where the sheets are overlapped, and the sheets are joined by the fusion material. First, it is joining by thermal fusion, and it expresses joining strength immediately after joining work, and it becomes work to place the melt-extruded fusion material in a small mouth, so that joint failure A joining method that hardly causes problems can be performed on the vulcanized rubber sheet.

請求項２では、融着材に用いる熱可塑性材料としてエチレンエチルアクリレート、エチレンビニルアセテート、サーモプラスチックオレフィンを挙げており、加硫ゴムシートに対して、十分な強度を持って融着することができるので、シート同士の接合強度も十分なものとすることができる。   In claim 2, ethylene ethyl acrylate, ethylene vinyl acetate, and a thermoplastic olefin are cited as the thermoplastic material used for the fusing material, and can be fused with sufficient strength to the vulcanized rubber sheet. Therefore, the bonding strength between the sheets can be sufficient.

請求項３では、融着材に紫外線吸収剤を配合しており、屋外で曝露されるような場合であっても耐候性に優れており、長期にわたってクラックの発生などの問題を低減することができる。   In claim 3, an ultraviolet absorber is blended in the fusion material, and it is excellent in weather resistance even when exposed to the outdoors, and it can reduce problems such as generation of cracks over a long period of time. it can.

図１は、加硫ゴムシートを接合したところの断面図であり、図２は本発明の接合方法を実施しようとして加硫ゴムシートを重ね合わせたところを示す概要図、図３は小口に融着材を配置しているところの概要図である。本発明の加硫ゴムシート１は、建築物の屋上等に用いられる防水シートや廃棄物処分場、貯水池等の底に敷設される遮水シートといった防水、遮水の用途に適用されるものである。   FIG. 1 is a cross-sectional view of the vulcanized rubber sheets joined together, FIG. 2 is a schematic view showing the vulcanized rubber sheets superimposed in an attempt to carry out the joining method of the present invention, and FIG. It is the schematic of the place which has arrange | positioned the dressing material. The vulcanized rubber sheet 1 of the present invention is applied to waterproofing and water shielding applications such as a waterproof sheet used on the roof of a building, a water shielding sheet laid on the bottom of a waste disposal site, a reservoir, and the like. is there.

ゴムの種類として挙げられるのは、クロロプレンゴム（ＣＲ）、ブチルゴム（ＩＩＲ）、スチレンブタジエンゴム（ＳＢＲ）、エチレンプロピレンジエンモノマー（ＥＰＤＭ）等の単体もしくはこれらのブレンド物を用いることができ、特に素材は限定するものではないが、中でもエチレンプロピレンジエンモノマー（ＥＰＤＭ）もしくはエチレンプロピレンジエンモノマー（ＥＰＤＭ）とブチルゴム（ＩＩＲ）のブレンド物を用いることが、常に屋外曝露の状況下で用いられる用途としては耐候性に優れている点で好ましい素材である。   Examples of rubbers include chloroprene rubber (CR), butyl rubber (IIR), styrene butadiene rubber (SBR), ethylene propylene diene monomer (EPDM) and the like, or a blend thereof. Although there is no limitation, the use of ethylene propylene diene monomer (EPDM) or a blend of ethylene propylene diene monomer (EPDM) and butyl rubber (IIR) is a weather resistance that is always used under outdoor exposure conditions. It is a preferable material in terms of excellent properties.

加硫ゴムシート１は、例えば遮水シートとして用いる場合、図４に示すような廃棄物処分場や溜め池などの底面２と法面３に敷設するものであり、通常１０００〜２０００ｍｍ幅のシートを向上で複数枚接合した幅広シートを現場に持ち込んで、前記底面２と法面３に設置して隣同士のシートを接合して全面をシートで覆った形にする。   The vulcanized rubber sheet 1 is laid on a bottom surface 2 and a slope 3 such as a waste disposal site or a reservoir as shown in FIG. A wide sheet obtained by joining a plurality of sheets is brought to the site, and installed on the bottom surface 2 and the slope 3 to join adjacent sheets so that the entire surface is covered with the sheet.

工場内である程度の幅広にした上で現場に持ち込むものの、やはり現場にて接合する部分は多数あり、本発明の接合方法はそのような場面で実施するものである。   Although it is brought to the site after making it wide to some extent in the factory, there are still many parts to be joined at the site, and the joining method of the present invention is carried out in such a scene.

本発明の加硫ゴムシートの接合方法は、隣り合う加硫ゴムシート１ａと加硫ゴムシート１ｂを互いに接合する場合に、まず一方の加硫ゴムシート１ａと他方の加硫ゴムシート１ｂを重なり合うように所定の位置に配置し、上側に重ね合わせた加硫ゴムシート１ｂの端縁になる小口４を形成する。次いで熱可塑性材料を加熱押出機６によって棒状に押し出した融着材５を、前記小口４に沿って加硫ゴムシート１ａ、１ｂに密着するように配置していく。上下の加硫ゴムシート１ａ、１ｂを重ね合わせて形成された小口４の全域にわたって融着材５を密着配置し、融着材５が冷却固化したらこれらの加硫ゴムシート１ａ、１ｂ同士の接合が完了する。   In the joining method of the vulcanized rubber sheet according to the present invention, when the adjacent vulcanized rubber sheet 1a and vulcanized rubber sheet 1b are joined together, first, one vulcanized rubber sheet 1a and the other vulcanized rubber sheet 1b are overlapped. Thus, the small edge 4 which forms the edge of the vulcanized rubber sheet 1b placed on a predetermined position and superimposed on the upper side is formed. Next, the fusion material 5 obtained by extruding the thermoplastic material into a rod shape by the heating extruder 6 is arranged so as to be in close contact with the vulcanized rubber sheets 1 a and 1 b along the small opening 4. When the fusing material 5 is closely disposed over the entire area of the small mouth 4 formed by overlapping the upper and lower vulcanized rubber sheets 1a and 1b, and the fusing material 5 is cooled and solidified, the vulcanized rubber sheets 1a and 1b are joined together. Is completed.

以上の接合は、熱融着による接合であり、融着材５の温度が下がれば融着は完了し、直ちに強固な接合強度を発現することができる。また、シートの重ね合わせ面同士を熱融着するものでもなく、シートの上から融着材を配置していけばよい比較的簡単な作業となるので接合不良が発生する可能性も極めて少ないといえる。廃棄物処分場等で用いる遮水シートを例に挙げて説明したが、用途はこれに限られるものではなく、ビル等の屋上に敷設して用いる防水シートの接合ででも使用することができる。   The above-mentioned joining is joining by thermal fusion, and if the temperature of the fusion material 5 is lowered, the fusion is completed, and a strong joining strength can be immediately expressed. Also, it is not a matter of heat-sealing the overlapping surfaces of the sheets, and it is relatively easy to arrange the fusion material from the top of the sheet, so there is very little possibility of poor bonding. I can say that. Although the water shielding sheet used in a waste disposal site has been described as an example, the application is not limited to this, and the sheet can be used for joining a waterproof sheet laid on a rooftop of a building or the like.

本発明で使用される融着材５の素材としては、エチレンエチルアクリレート（ＥＥＡ）、エチレンビニルアセテート（ＥＶＡ）、オレフィン系熱可塑性エラストマー（ＴＰＯ）、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）、これらのブレンド体等の素材を挙げることができる。この中でも加硫ゴムシートとの融着強度に優れていること、押出機での押出が容易で作業性に優れているといった点からエチレンエチルアクリレート（ＥＥＡ）を用いることが最も好ましい。   As the material of the fusion material 5 used in the present invention, ethylene ethyl acrylate (EEA), ethylene vinyl acetate (EVA), olefin-based thermoplastic elastomer (TPO), polyethylene (PE), polypropylene (PP), and these Materials such as blends can be mentioned. Among these, it is most preferable to use ethylene ethyl acrylate (EEA) from the viewpoints of excellent fusion strength with the vulcanized rubber sheet, easy extrusion with an extruder and excellent workability.

また、これらの融着材５を用いるのは通常の場合、廃棄物処分場や屋上といった屋外曝露される場所で用いられることが多く、融着材５の耐候性を高めるために紫外線吸収剤を配合して用いることが好ましい。紫外線吸収剤としては、カーボンブラック、酸化チタン等を挙げることができ、融着材の主成分である樹脂１００質量部に対して４〜２０質量部の範囲で配合する。   Further, these fusion materials 5 are usually used in places exposed to the outdoors such as waste disposal sites and rooftops, and ultraviolet absorbers are used to improve the weather resistance of the fusion material 5. It is preferable to mix and use. Examples of the ultraviolet absorber include carbon black and titanium oxide. The ultraviolet absorber is blended in an amount of 4 to 20 parts by mass with respect to 100 parts by mass of the resin as the main component of the fusion material.

融着材５の加熱押出機６は原料のホッパー７とスクリュー（図示しない）とヒータ（図示しない）を備えており、図３に示すようにホッパー７から供給された熱可塑性樹脂やカーボンブラック等の原料を加熱して溶融状態にし、スクリューで混練しつつ棒状の融着材５として押し出す。このような押出機を加硫ゴムシート１ａ、１ｂの接合部に沿って図中の矢印方向に移動させ、端から順次融着材５を小口４に密着配置していく。   The heating extruder 6 for the fusion material 5 includes a hopper 7 of raw material, a screw (not shown), and a heater (not shown). As shown in FIG. 3, a thermoplastic resin, carbon black or the like supplied from the hopper 7 is provided. The raw material is heated to a molten state and extruded as a rod-shaped fusion material 5 while being kneaded with a screw. Such an extruder is moved in the direction of the arrow in the drawing along the joining portions of the vulcanized rubber sheets 1a and 1b, and the fusion material 5 is sequentially placed in close contact with the small opening 4 from the end.

加硫ゴムシートからなる防水シートや遮水シートの現場での接合の際に、適用することができる。   It can be applied when joining a waterproof sheet made of a vulcanized rubber sheet or a water shielding sheet on site.

加硫ゴムシートを接合したところの断面図である。It is sectional drawing of the place which joined the vulcanized rubber sheet. 加硫ゴムシートを重ね合わせたところを示す概要図である。It is a schematic diagram which shows the place which accumulated the vulcanized rubber sheet. 加硫ゴムシートを重ねた小口に融着材を配置しているところの概要図である。It is the schematic of the place which has arrange | positioned the fusion | bonding material in the fore which piled up the vulcanized rubber sheet. 加硫ゴムシートを敷設する一例の廃棄物処分場の断面図である。It is sectional drawing of the waste disposal site of an example which lays a vulcanized rubber sheet.

符号の説明Explanation of symbols

１ａ 加硫ゴムシート
１ｂ 加硫ゴムシート
２ 底面
３ 法面
４ 小口
５ 融着材
６ 加熱押出機
７ ホッパー DESCRIPTION OF SYMBOLS 1a Vulcanized rubber sheet 1b Vulcanized rubber sheet 2 Bottom surface 3 Slope 4 Small mouth 5 Fusion material 6 Heating extruder 7 Hopper

Claims (3)

加硫ゴムシートの接合方法において、該シートの端部同士を重ね合わせた状態で、熱可塑性材料からなる融着材を溶融押出ながら、前記加硫ゴムシートの重ね合わせ部分において両方のシートにまたがるように、前記溶融した融着材を配置して加硫ゴムシート同士を接合してなることを特徴とする加硫ゴムシートの接合方法。   In the joining method of the vulcanized rubber sheet, the melted material made of a thermoplastic material is melted and extruded while the end portions of the sheets are overlapped with each other, and the vulcanized rubber sheet overlaps both sheets. As described above, the method for joining vulcanized rubber sheets is characterized by arranging the melted fusion material and joining the vulcanized rubber sheets together. 融着材を構成する熱可塑性材料がエチレンエチルアクリレート、エチレンビニルアセテート、サーモプラスチックオレフィンから選ばれてなく少なくとも一種である請求項１記載の加硫ゴムシートの接合方法。   The method for joining vulcanized rubber sheets according to claim 1, wherein the thermoplastic material constituting the fusing material is at least one selected from ethylene ethyl acrylate, ethylene vinyl acetate, and thermoplastic olefin. 融着材には紫外線吸収剤を配合してなる請求項１もしくは２のいずれかに記載の加硫ゴムシートの接合方法。   The method for joining vulcanized rubber sheets according to claim 1, wherein an ultraviolet absorber is blended in the fusion material.
JP2008252746A 2008-09-30 2008-09-30 Method for bonding vulcanized rubber sheet Pending JP2010082903A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101241409B1 (en) * 2012-11-02 2013-03-11 주식회사 한솔테크 Making method of air bag

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101241409B1 (en) * 2012-11-02 2013-03-11 주식회사 한솔테크 Making method of air bag

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