JPH06293067A - Composite sheet - Google Patents
Composite sheetInfo
- Publication number
- JPH06293067A JPH06293067A JP5083159A JP8315993A JPH06293067A JP H06293067 A JPH06293067 A JP H06293067A JP 5083159 A JP5083159 A JP 5083159A JP 8315993 A JP8315993 A JP 8315993A JP H06293067 A JPH06293067 A JP H06293067A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- composite sheet
- elastic
- substantially non
- layer
- 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
Landscapes
- Absorbent Articles And Supports Therefor (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば紙オムツや衣
類、その他の物品などにおいて、伸縮性の必要な部分に
用いられるギャザー（ひだ）形成用に好適に用いられる
複合体シートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite sheet suitably used for forming gathers (folds) used in stretchable parts of, for example, disposable diapers, clothes and other articles.
【０００２】[0002]
【従来の技術】従来、衣類や紙オムツ等の伸縮性の必要
な部分には、例えば天然ゴムなどの弾性材料を製造ライ
ン中で延伸して装着することにより、ギャザーを形成し
ていたため、その弾性材料が伸びるためその取り扱い性
が悪く、作業効率が著しく劣っていた。2. Description of the Related Art Conventionally, gathers have been formed by stretching and mounting an elastic material such as natural rubber in a manufacturing line in a stretchable portion such as clothes and diapers. Since the elastic material was stretched, its handleability was poor and the work efficiency was extremely poor.
【０００３】これを解決する目的で、弾性体と非弾性体
をシートの厚さ方向に積層し、延伸することにより、伸
縮性を付与してなるシートが知られている。（例えば、
ＷＯ91／15355 号公報、ＷＯ91／15364 号公報など）For the purpose of solving this problem, there is known a sheet in which an elastic body and an inelastic body are laminated in the thickness direction of the sheet and stretched to give elasticity. (For example,
(WO91 / 15355, WO91 / 15364, etc.)
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、これら
のシートでは、弾性体と非弾性体がシートの厚さ方向に
積層されているため、弾性体の伸縮作用が非弾性体によ
り抑制されて充分な伸縮性が得られないという問題があ
った。 さらに、延伸を強くかけると、弾性体層と非弾
性体層との層間に応力が集中して、層間剥離を生じ、そ
の結果シート表面に多くのシワが発生し、破れ易くなる
という問題もあった。However, in these sheets, since the elastic body and the non-elastic body are laminated in the thickness direction of the sheet, the expansion and contraction action of the elastic body is sufficiently suppressed by the non-elastic body. There was a problem that elasticity could not be obtained. Further, when the stretching is strongly applied, stress is concentrated between the layers of the elastic layer and the non-elastic layer to cause delamination, resulting in many wrinkles on the surface of the sheet, which easily breaks. It was
【０００５】[0005]
【課題を解決するための手段】本発明は、上記の問題点
を改良するためになされたもので、弾性体層と非弾性体
層とをシート幅方向に配列一体化することにより、必要
時に簡便に伸縮性を付与でき、取り扱い性、伸縮性、強
度などに優れた複合体シートに関する。SUMMARY OF THE INVENTION The present invention has been made to improve the above-mentioned problems. When the elastic layer and the non-elastic layer are arranged and integrated in the sheet width direction, they can be integrated as needed. The present invention relates to a composite sheet that can be easily imparted with elasticity and is excellent in handleability, elasticity, strength and the like.
【０００６】即ち、本発明は、シート幅方向に、弾性体
層と実質的に非弾性体層とを交互に配列して一体化して
なる実質的に非伸縮性の複合体シートであって、該シー
トを延伸及び／又は加熱することにより、該シートに伸
縮性を付与できることを特徴とする複合体シートを提供
する。That is, the present invention provides a substantially non-stretchable composite sheet in which elastic layers and substantially non-elastic layers are alternately arranged in the sheet width direction and integrated. Provided is a composite sheet, which can be stretched by stretching and / or heating the sheet.
【０００７】さらに本発明は、この実質的に非伸縮性の
複合体シートを、延伸及び／又は加熱して得られる、ギ
ャザーを有する伸縮性の複合体シートも提供する。The present invention also provides a stretchable composite sheet having gathers, which is obtained by stretching and / or heating the substantially non-stretchable composite sheet.
【０００８】以下、本発明の実例を図面にもとづいて説
明する。図１及び図２は、本発明の複合体シートの実例
を示す斜視図であり、弾性体層１と非弾性体層２とが、
シートの幅方向Ａにわたって交互に配列され、接合一体
化されてなる。An example of the present invention will be described below with reference to the drawings. 1 and 2 are perspective views showing an example of the composite sheet of the present invention, in which the elastic layer 1 and the non-elastic layer 2 are
The sheets are alternately arranged in the width direction A of the sheet and are joined and integrated.
【０００９】ここで各層１及び２の配列順序、幅など
は、特に限定されず、シート端部を弾性体層１とするこ
ともできる。 またシート厚も特に限定されないが、好
ましくは２０〜５０μｍ程度である。Here, the arrangement order, width, etc. of the layers 1 and 2 are not particularly limited, and the sheet end portion may be the elastic layer 1. The sheet thickness is not particularly limited, but is preferably about 20 to 50 μm.
【００１０】図３は、本発明の実質的に非伸縮性の複合
体シートを、シートの長さ方向に延伸及び／又は加熱し
て得た、伸縮性を有する複合体シートの概略図であり、
非弾性体層２は、ギャザー（ひだ）を有している。FIG. 3 is a schematic view of a stretchable composite sheet obtained by stretching and / or heating the substantially non-stretchable composite sheet of the present invention in the length direction of the sheet. ,
The non-elastic body layer 2 has gathers (folds).
【００１１】本発明の複合体シートは、延伸及び／又は
加熱前は実質的に非伸縮性であり、伸縮性を付与するた
めには、例えばかかる複合体シートの非弾性体層の弾性
限界を超えてシート長さ方向に延伸（例えば５０〜３０
０％）し、その後、力を解放することにより、延伸され
た弾性体層が収縮し、この弾性体層と一体接合されかつ
弾性破壊された非弾性体層がこの弾性体層に追従するこ
とにより、全体としてシート長さ方向へギャザーを有す
る伸縮性のある複合体シートが得られる。The composite sheet of the present invention is substantially non-stretchable before stretching and / or heating, and in order to impart the stretchability, for example, the elastic limit of the non-elastic layer of the composite sheet is set. Stretching beyond the sheet length (eg 50-30
0%), and then releasing the force causes the stretched elastic body layer to contract, and the non-elastic body layer integrally joined with the elastic body layer and elastically broken follows the elastic body layer. Thereby, a stretchable composite sheet having gathers in the sheet length direction as a whole is obtained.
【００１２】また、本発明の実質的に非伸縮性の複合体
シートを、後述の如く加熱延伸（例えば８０〜１２０℃
で１００〜２００％延伸）した後急冷して得た場合は、
その加熱温度程度に再び加熱することにより、弾性体層
が収縮し、上記と同様に全体として伸縮性のある複合体
シートが得られる。The substantially non-stretchable composite sheet of the present invention is heat-stretched (for example, 80 to 120 ° C.) as described later.
(100 to 200% stretching) and then rapidly cooled,
By heating again to about the heating temperature, the elastic layer shrinks, and a composite sheet having elasticity as a whole as described above is obtained.
【００１３】図４(a) 〜(d) は、本発明における複合体
シートの他例における弾性体層１と非弾性体層２との接
合部を示す一部拡大断面図であり、その接合部の断面構
造は、略くさび状もしくは略台形状となっている。 か
かる構造とすることにより、弾性体層１と非弾性体層２
との接合面積が大きくできるため、接合強度を増大させ
ることができ、層間剥離しにくいという効果がある。FIGS. 4 (a) to 4 (d) are partially enlarged sectional views showing a joint portion between the elastic layer 1 and the non-elastic layer 2 in another example of the composite sheet of the present invention. The cross-sectional structure of the portion has a substantially wedge shape or a substantially trapezoidal shape. With such a structure, the elastic layer 1 and the non-elastic layer 2
Since the bonding area with the can be increased, the bonding strength can be increased, and there is an effect that delamination is difficult.
【００１４】本発明においては、前記複合体シートの少
なくとも片面の、全部もしくは一部に、接着剤層を設け
ることにより、紙オムツなどの被着体に簡便に装着する
ことができる。 用いる接着剤層は、特に限定されない
が、通常ゴム系、アクリル系系などの粘着剤層や感熱性
（ホットメルト型）接着剤層などが挙げられる。In the present invention, an adhesive layer is provided on all or part of at least one surface of the composite sheet, so that it can be easily attached to an adherend such as a disposable diaper. The adhesive layer to be used is not particularly limited, but examples thereof include a rubber-based or acrylic-based pressure-sensitive adhesive layer and a heat-sensitive (hot melt type) adhesive layer.
【００１５】図５は、複合体シートの片面に、接着剤層
３を設けてなる複合体シートの断面図、図６は複合体シ
ートの非弾性剤層２の両面に接着剤層３を設けてなる複
合体シートの断面図である。FIG. 5 is a sectional view of a composite sheet in which an adhesive layer 3 is provided on one surface of the composite sheet, and FIG. 6 is shown in FIG. 6 in which the adhesive layer 3 is provided on both sides of the inelastic agent layer 2 of the composite sheet. FIG. 3 is a cross-sectional view of a composite sheet including
【００１６】本発明の複合体シートを、例えば紙オムツ
などの被着体に設けてギャザーを形成する方法は、特に
限定されないが、例えば紙オムツのウエストバンド部
に、接着剤層を介して本発明の複合体シートを設け、次
いで加熱あるいは延伸することによりその部分をギャザ
ー化することができる。The method of forming the gather by providing the composite sheet of the present invention on an adherend such as a paper diaper is not particularly limited, but, for example, the waist band portion of the paper diaper is provided with an adhesive layer interposed therebetween. By providing the composite sheet of the invention and then heating or stretching, that portion can be gathered.
【００１７】本発明の複合体シートを構成する弾性体層
は、本発明の目的を達することができるものであれば何
ら限定されず、好ましくは２００％伸長し、元に戻した
ときの永久歪みが５０％以下であれば、なんらその材質
に限定されるものではない。本発明においては、例え
ば、スチレン系（ＳＢＳ、ＳＥＢＳ、ＳＩＰＳなど）、
オレフィン系（ＥＶＡ、ＥＰＤＭ、ＥＰＴ、ＶＬＤＰＥ
など）、ウレタン系などのエラストマー、もしくはこれ
らのブレンド物、もしくはこれらを主成分とするエチス
トマーが挙げられる。The elastic layer constituting the composite sheet of the present invention is not limited as long as the object of the present invention can be achieved, and preferably 200% elongation and permanent set when restored. Is not more than 50%, the material is not limited at all. In the present invention, for example, styrene type (SBS, SEBS, SIPS, etc.),
Olefin type (EVA, EPDM, EPT, VLDPE
Etc.), urethane-based elastomers, blends of these, or ethismers containing these as the main components.
【００１８】また本発明においては、上記弾性体へ下記
非弾性体の一部を配合することにより、非弾性体と弾性
体との接合を強力にすることもできる。 また、上記弾
性体へその弾性率を下げるために、タッキファイヤーを
加えることもできる。Further, in the present invention, the non-elastic body and the elastic body can be strongly bonded by mixing a part of the following non-elastic body with the elastic body. Further, a tackifier may be added to the elastic body in order to reduce its elastic modulus.
【００１９】また非弾性体層とは、実質的に非弾性体で
あれば、若干の弾性を有するものであってもよく、前記
弾性体より弾性率が小さいものであればよいが、好まし
くはその取り扱い性等の点からできるだけ伸びないもの
が良い。The non-elastic layer may be a layer having a slight elasticity as long as it is a substantially non-elastic body, and may have a smaller elastic modulus than the elastic body, but is preferably. From the viewpoint of its handleability, it is preferable that it does not stretch as much as possible.
【００２０】かかる非弾性体としては、例えば、オレフ
ィン系（ポリエチレン、ポリプロピレン、エチレン酢酸
ビニル共重合体などのひとつもしくはこれらのブレンド
物）などが挙げられる。Examples of such non-elastic materials include olefin-based materials (one of polyethylene, polypropylene, ethylene-vinyl acetate copolymer or a blend thereof).
【００２１】本発明の複合体シートを得る方法、すなわ
ち上記各層を交互に配列して一体接合する方法は、例え
ば各層の構成材料からなるペレットを共押出しすること
により得ることができる。 この際、使用する押出しダ
イの口形状を所望の略くさび状もしくは略台形状とする
ことにより、接合部をかかる構造とすることができる。The method of obtaining the composite sheet of the present invention, that is, the method of alternately arranging the above layers and integrally joining them can be obtained by, for example, coextruding pellets made of the constituent material of each layer. At this time, by making the mouth shape of the extrusion die to be used into a desired substantially wedge shape or substantially trapezoidal shape, the joint portion can have such a structure.
【００２２】[0022]
【発明の効果】本発明の複合体シートは、弾性体層と非
弾性体層とを幅方向に交互に配列して接合一体化してな
る構造とすることにより、延伸前は実質的に非伸縮性で
あるため、製造ラインでの取り扱い性に優れ、かつ例え
ば室温中で延伸するだけで、伸縮性を付与することがで
きるため、極めて優れた作業性を有する。 さらに、弾
性体層と非弾性体層とが幅方向に交互に配列されている
ため、長さ方向に延伸されることによりシート全体が非
常に伸び易く、また応力が長さ方向にかかるため、接合
部への応力集中が少なく、層間剥離が生じないという利
点もある。EFFECTS OF THE INVENTION The composite sheet of the present invention has a structure in which elastic layers and non-elastic layers are alternately arranged in the width direction so as to be joined and integrated, so that the composite sheet is substantially non-stretchable before stretching. Therefore, it has excellent handleability in the production line, and since it can be stretched only by stretching at room temperature, it has extremely excellent workability. Furthermore, since the elastic layer and the non-elastic layer are alternately arranged in the width direction, the entire sheet is very easily stretched by stretching in the length direction, and since stress is applied in the length direction, There is also an advantage that stress concentration on the joint is small and delamination does not occur.
【００２３】また、その用途は何ら限定されないが、例
えば、紙オムツや衣類、その他梱包用材料など、伸縮性
を必要とされる部分へのギャザー（ひだ）形成用に使用
できる。Although the use thereof is not limited at all, it can be used for gathering (folding) in a portion requiring elasticity such as paper diapers, clothes, and other packaging materials.
【００２４】[0024]
実施例１ 弾性体としてスチレン−エチレン−ブタジエン−スチレ
ン（ＳＥＢＳ）ブロックポリマー１００重量部と低密度
ポリエチレン３０重量部との混合物からなるペレット
と、非弾性体として低密度ポリエチレン１００重量部か
らなるペレットとを、共押し出し機にて２２０℃で押し
出し、厚さ１００μｍの実質的に非伸縮性の複合体シー
トを得た。 ここでシート幅は９ｍｍで、図１の如くの
配列で弾性体層幅は５ｍｍ、非弾性体層幅は２ｍｍであ
った。Example 1 Pellets made of a mixture of 100 parts by weight of styrene-ethylene-butadiene-styrene (SEBS) block polymer and 30 parts by weight of low density polyethylene as an elastic body, and pellets made of 100 parts by weight of low density polyethylene as an inelastic body. Was extruded with a co-extrusion machine at 220 ° C. to obtain a substantially non-stretchable composite sheet having a thickness of 100 μm. Here, the sheet width was 9 mm, the elastic layer width was 5 mm and the non-elastic layer width was 2 mm in the arrangement as shown in FIG.
【００２５】この複合体シートは実質的に非伸縮性であ
るが、このシートを非弾性体層の弾性限界を超えて室温
で２００％延伸した後、力を開放することにより、ギャ
ザーとなり伸縮性を有する複合体シートが得られた。Although the composite sheet is substantially non-stretchable, the sheet is stretched by 200% at room temperature beyond the elastic limit of the non-elastic layer and then released from the force to become gather and stretch. A composite sheet having
【００２６】実施例２ 実施例１で用いた各ペレットを、共押し出し機にて２２
０℃で押し出し、次いで１００℃のオーブン中で２００
％延伸後、急冷することにより、本発明の複合体シート
を得た。 この複合体シートは室温において実質的に非
伸縮性であるが、１００℃に加熱することにより２５％
収縮して、ギャザーとなり伸縮性を有する複合体シート
が得られた。Example 2 The pellets used in Example 1 were mixed with a co-extruder 22
Extrude at 0 ° C, then 200 in an oven at 100 ° C.
%, And then quenched to obtain a composite sheet of the present invention. This composite sheet is substantially non-stretchable at room temperature, but when heated to 100 ° C.
The composite sheet was contracted to become a gather and a stretchable composite sheet was obtained.
【図１】本発明の複合体シートの一例を示す斜視図であ
る。FIG. 1 is a perspective view showing an example of a composite sheet of the present invention.
【図２】本発明の複合体シートの一例を示す斜視図であ
る。FIG. 2 is a perspective view showing an example of a composite sheet of the present invention.
【図３】本発明の伸縮性を有する複合体シートの一例を
示す説明図である。FIG. 3 is an explanatory view showing an example of a stretchable composite sheet of the present invention.
【図４】本発明の複合体シートの他例における一部拡大
断面図である。FIG. 4 is a partially enlarged cross-sectional view of another example of the composite sheet of the present invention.
【図５】本発明の複合体シートの一例を示す断面図であ
る。FIG. 5 is a cross-sectional view showing an example of the composite sheet of the present invention.
【図６】本発明の複合体シートの一例を示す断面図であ
る。FIG. 6 is a cross-sectional view showing an example of the composite sheet of the present invention.
１ 弾性体層 ２ 非弾性体層 ３ 接着剤層 1 elastic layer 2 non-elastic layer 3 adhesive layer
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ３２Ｂ 7/02 １０１ 7148−4Ｆ // Ｂ２９Ｋ 21:00 Ｂ２９Ｌ 31:48 4Ｆ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location B32B 7/02 101 7148-4F // B29K 21:00 B29L 31:48 4F
Claims (5)
弾性体層とを交互に配列して一体化してなる実質的に非
伸縮性の複合体シートであって、該シートを延伸及び／
又は加熱することにより、該シートに伸縮性を付与でき
ることを特徴とする複合体シート。1. A substantially non-stretchable composite sheet in which elastic layers and substantially non-elastic layers are alternately arranged and integrated in the sheet width direction, and the sheet is stretched. as well as/
Alternatively, the composite sheet is characterized in that the sheet can be stretched by heating.
有する実質的に非弾性体層とが交互に配列されて一体化
されてなる伸縮性を有する複合体シート。2. A stretchable composite sheet in which elastic layers and substantially non-elastic layers having gathers are alternately arranged and integrated in the sheet width direction.
部付近の断面構造が、略くさび状もしくは略台形状とさ
れていることを特徴とする請求項１又は２記載の複合体
シート。3. The composite according to claim 1, wherein the cross-sectional structure near the joint between the elastic body layer and the substantially non-elastic body layer has a substantially wedge shape or a substantially trapezoidal shape. Body sheet.
くとも片面の全部もしくは一部に、接着剤層が設けられ
てなる複合体シート。4. A composite sheet in which an adhesive layer is provided on all or part of at least one side of the composite sheet according to claim 1.
オムツの伸縮性の必要な部分に設けられてなる紙オム
ツ。5. A paper diaper in which the composite sheet according to any one of claims 1 to 4 is provided on a portion of the paper diaper that needs elasticity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5083159A JPH06293067A (en) | 1993-04-09 | 1993-04-09 | Composite sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5083159A JPH06293067A (en) | 1993-04-09 | 1993-04-09 | Composite sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06293067A true JPH06293067A (en) | 1994-10-21 |
Family
ID=13794475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5083159A Pending JPH06293067A (en) | 1993-04-09 | 1993-04-09 | Composite sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06293067A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6106922A (en) * | 1997-10-03 | 2000-08-22 | 3M Innovative Company | Coextruded mechanical fastener constructions |
| US6447875B1 (en) | 1999-07-30 | 2002-09-10 | 3M Innovative Properties Company | Polymeric articles having embedded phases |
| US6927315B1 (en) | 1999-07-30 | 2005-08-09 | 3M Innovative Properties Company | Adhesive composite having distinct phases |
| US7622180B2 (en) | 2006-07-10 | 2009-11-24 | 3M Innovative Properties Company | Net hook fasteners |
| US7678316B2 (en) | 2004-06-08 | 2010-03-16 | 3M Innovative Properties Company | Coextruded profiled webs |
| US7897081B2 (en) | 2004-12-30 | 2011-03-01 | 3M Innovative Properties Company | Method of extruding articles |
| WO2012038613A1 (en) * | 2010-09-23 | 2012-03-29 | Aplix | Resilient laminate having increased strength against stresses |
| JP2015529581A (en) * | 2012-08-08 | 2015-10-08 | スリーエム イノベイティブ プロパティズ カンパニー | Method for producing stretchable web laminate |
| JP2017024246A (en) * | 2015-07-21 | 2017-02-02 | 武藤工業株式会社 | Composite resin material |
-
1993
- 1993-04-09 JP JP5083159A patent/JPH06293067A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6106922A (en) * | 1997-10-03 | 2000-08-22 | 3M Innovative Company | Coextruded mechanical fastener constructions |
| US6447875B1 (en) | 1999-07-30 | 2002-09-10 | 3M Innovative Properties Company | Polymeric articles having embedded phases |
| US6767492B2 (en) | 1999-07-30 | 2004-07-27 | 3M Innovative Properties Company | Extrusion die and process |
| US6927315B1 (en) | 1999-07-30 | 2005-08-09 | 3M Innovative Properties Company | Adhesive composite having distinct phases |
| US7968172B2 (en) | 2004-06-08 | 2011-06-28 | 3M Innovative Properties Company | Coextruded profiled webs |
| US7678316B2 (en) | 2004-06-08 | 2010-03-16 | 3M Innovative Properties Company | Coextruded profiled webs |
| US7897081B2 (en) | 2004-12-30 | 2011-03-01 | 3M Innovative Properties Company | Method of extruding articles |
| US7622180B2 (en) | 2006-07-10 | 2009-11-24 | 3M Innovative Properties Company | Net hook fasteners |
| WO2012038613A1 (en) * | 2010-09-23 | 2012-03-29 | Aplix | Resilient laminate having increased strength against stresses |
| FR2965212A1 (en) * | 2010-09-23 | 2012-03-30 | Aplix Sa | REINFORCED RESISTANT ELASTIC LAMINATE |
| JP2013538626A (en) * | 2010-09-23 | 2013-10-17 | アプリックス | Elastic laminate with high strength against stress |
| KR20140001841A (en) * | 2010-09-23 | 2014-01-07 | 아플릭스 | Resilient laminate having increased against stresses |
| US9138959B2 (en) | 2010-09-23 | 2015-09-22 | Aplix | Resilient laminate having increased strength against stresses |
| JP2015529581A (en) * | 2012-08-08 | 2015-10-08 | スリーエム イノベイティブ プロパティズ カンパニー | Method for producing stretchable web laminate |
| JP2017024246A (en) * | 2015-07-21 | 2017-02-02 | 武藤工業株式会社 | Composite resin material |
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