JPH0362546B2 - - Google Patents
Info
- Publication number
- JPH0362546B2 JPH0362546B2 JP62065217A JP6521787A JPH0362546B2 JP H0362546 B2 JPH0362546 B2 JP H0362546B2 JP 62065217 A JP62065217 A JP 62065217A JP 6521787 A JP6521787 A JP 6521787A JP H0362546 B2 JPH0362546 B2 JP H0362546B2
- Authority
- JP
- Japan
- Prior art keywords
- reinforcing material
- laminated
- composite material
- knitted
- knitted fabric
- 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 - Lifetime
Links
- 239000012779 reinforcing material Substances 0.000 claims description 29
- 239000004744 fabric Substances 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 239000010410 layer Substances 0.000 description 12
- 238000009940 knitting Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 230000002787 reinforcement Effects 0.000 description 9
- 229920006231 aramid fiber Polymers 0.000 description 7
- 239000003365 glass fiber Substances 0.000 description 6
- 239000004760 aramid Substances 0.000 description 5
- 239000011185 multilayer composite material Substances 0.000 description 5
- 239000002759 woven fabric Substances 0.000 description 5
- 239000011162 core material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 3
- 230000032798 delamination Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 125000002723 alicyclic group Chemical group 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000768 polyamine Polymers 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 229920006305 unsaturated polyester Polymers 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229920001153 Polydicyclopentadiene Polymers 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 238000010107 reaction injection moulding Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Reinforced Plastic Materials (AREA)
- Laminated Bodies (AREA)
- Moulding By Coating Moulds (AREA)
Description
（産業上の利用分野）
本発明は、耐衝撃性の向上並びに層間剥離の減
少を図つた多層構造複合材料に関する。
（従来技術）
従来は、例えばガラス繊維や炭素繊維、アラミ
ド繊維などを定長カツトして形成したマツト或い
は織物地を強化材として合成樹脂で成形した積層
複合材料がみられるが、いずれも耐衝撃性が小さ
く、さらに層間剥離を生じやすいなどの欠点があ
つた。
（発明が解決しようとする問題点）
前記のマツト或いは織物地を複数枚積層した強
化材による積層複合材料の場合は、同複合材料に
衝撃又は曲げ応力が加わると、該積層材間で互い
にズレを生じて剥離し易くなり、耐衝撃性の低下
並びに層間剥離の減少を招き、強化材としての能
力を十分発揮できない欠点があつた。
（問題を解決するための手段）
本発明は、このような従来の問題点を解決する
ものであつて、そのための具体的な手段として多
層編物地を強化材として用いることにより、強化
材間のズレを防止すると共に耐衝撃性の向上並び
に層間せん断の改善を図ることができたのであ
る。
先ず、本発明の強化材について以下図例に基づ
いて説明する。
第１図は三層構造の編物地１による強化材Ａを
示したもので、ダブルラツセル編機を用いてダブ
ルラツセル、パイル編により、表層１Ｘ、中間層
１Ｙ及び裏層１Ｚの三層構造からなる編物地で、
表層１Ｘ及び裏層１Ｚは、第２図の編物織図の如
く糸条２，３により、表層１Ｘ及び裏層１Ｚを形
成すると共に表層１Ｘ及び裏層１Ｚに夫々連結編
されたパイル糸４により中間層１Ｙを形成するよ
うに編成したものである。
また、上記編物地１の糸条２，３及びパイル糸
４の編立糸条は夫々フイラメント数が360本、太
さが360デニールのアラミド繊維による単糸糸条
を用いて目付が700ｇ／m2の編物地１が得られる
ように編成したものである。
尚、編物地１は、ダブルラツセル編機により編
成した三層構造のものであるが、その他経編機や
メリヤス丸編機、横式編機などにより、二層、三
層、四層構造など適宜の多層構造の編物地を編成
してもよく、更に編立糸条の素材としては、アラ
ミド繊維やガラス繊維、炭素繊維などのほか各種
の合成繊維、鉱物性繊維、天然繊維などの単独又
は混成された繊維を用いてもよい。
更に前記繊維による編立糸条は単糸または引揃
え糸、交撚糸、カバリング糸など適宜の編立糸条
を使用してもよく、この場合編立糸条としては、
モノフイラメント或いはマルチフイラメントのい
ずれでもよい。
また、前記のマルチフイラメント数は10〜6000
本の範囲が好ましく、更にモノフイラメントやマ
ルチフイラメント糸条の太さは１〜10000デニー
ルで多層編物地の目付が30〜3000ｇ／m2の範囲の
ものが好ましい。
第３図はアラミド繊維使いの平織物地５による
強化材Ｂを示したもので、フイラメント数が4300
本、太さが6000デニールのアラミド繊維による単
糸々条を夫々経糸６及び緯糸７に用いて平織物地
（目付360ｇ／m2）を編成したものである。
第４図はガラス繊維使いの平織物地８による強
化材Ｃを示したもので、フイラメント数が850本、
太さが1200デニールのガラス繊維による単糸々条
を夫々経糸９及び緯糸１０に用いて平織物地（目
付600ｇ／m2）を編成したものである。
次に本発明の実施に有用な反応性樹脂について
述べると、従来からマトリツクス用に使用されて
いるエポキシ樹脂、不飽和ポリエステル、ポリイ
ミドなど熱硬化性樹脂のほかに、反応射出成形に
用いられるポリアミド（ナイロン）、ポリジシク
ロペンタジエン、エポキシ樹脂、不飽和ポリエス
テル、シリコーン樹脂、ポリウレタンなどが好ま
しい。
更に本発明の内容を充分に説明するために、以
下実施例並びに比較例を記載するが、これらの実
施例はただ内容を説明するためのものであつて、
本発明を限定するものではない。
実施例 １
強化材Ａ（目付700ｇ／m2）を縦19cm、横31cmに
裁断したものを、第５図の如く３枚積層して試料
を作成し、反応性樹脂としてビスフエノールＡ型
エポキシ樹脂（商品名E828：油化シエルエポキ
シ株式会社製）、硬化剤としては変性脂環族ポリ
アミン（商品名YLH−006：油化シエルエポキシ
株式会社製）を用い、容器内にこの樹脂混合液を
加えて前記試料を浸漬し、更にスクイズローラに
て十分に含浸脱泡を行なつた後、同試料を成形用
金型（内容積：縦20cm×横32cm×厚さ0.3cm）内
に入れて、加熱プレス法により、第１表に示す如
き条件下で、多層構造複合材料（強化材含有率
48.4Vol％）を作成した。
(Industrial Application Field) The present invention relates to a multilayer composite material with improved impact resistance and reduced delamination. (Prior art) Conventionally, there have been laminated composite materials made of pine or woven fabric made by cutting glass fibers, carbon fibers, aramid fibers, etc. to a fixed length and molded with synthetic resin as reinforcement materials, but both of these materials have impact resistance. It had drawbacks such as low elasticity and easy delamination. (Problems to be Solved by the Invention) In the case of a laminated composite material made of a reinforcing material made by laminating a plurality of pine or textile materials, when an impact or bending stress is applied to the composite material, the laminated materials may shift from each other. This results in a decrease in impact resistance and delamination, resulting in the inability to fully demonstrate its ability as a reinforcing material. (Means for Solving the Problems) The present invention is intended to solve such conventional problems, and as a specific means for that purpose, by using a multilayer knitted fabric as a reinforcing material, it is possible to improve the strength between the reinforcing materials. In addition to preventing misalignment, it was possible to improve impact resistance and interlaminar shear. First, the reinforcing material of the present invention will be explained below based on the illustrated examples. Figure 1 shows a reinforced material A made of a knitted fabric 1 with a three-layer structure, which is fabricated by double lattice and pile knitting using a double lattice knitting machine to create a knitted fabric with a three-layer structure of a surface layer 1X, an intermediate layer 1Y, and a back layer 1Z. On the ground
The surface layer 1X and the back layer 1Z are formed by yarns 2 and 3, as shown in the knitting diagram in FIG. It is knitted to form an intermediate layer 1Y. Furthermore, the knitted yarns of the yarns 2 and 3 of the knitted fabric 1 and the pile yarn 4 are each made of single yarns made of aramid fibers having a number of filaments of 360 and a thickness of 360 denier, and have a basis weight of 700 g/m. It is knitted so that 2 knitted fabrics 1 can be obtained. The knitted fabric 1 has a three-layer structure knitted by a double lattice knitting machine, but it can also be formed into a two-layer, three-layer, four-layer structure, etc. by using other warp knitting machines, stockinette circular knitting machines, horizontal knitting machines, etc. A multi-layered knitted fabric may be knitted, and the material of the knitted yarn may be aramid fiber, glass fiber, carbon fiber, etc., as well as various synthetic fibers, mineral fibers, natural fibers, etc. alone or in combination. You may also use fibers made of Further, the knitting yarn of the above-mentioned fibers may be an appropriate knitting yarn such as a single yarn, a drawn yarn, a twisted yarn, a covering yarn, etc. In this case, the knitting yarn is:
Either monofilament or multifilament may be used. In addition, the number of multifilaments mentioned above is 10 to 6000.
The thickness of the monofilament or multifilament yarn is preferably 1 to 10,000 deniers, and the weight of the multilayer knitted fabric is preferably 30 to 3,000 g/m 2 . Figure 3 shows reinforcement material B made of plain weave fabric 5 made of aramid fibers, with a filament count of 4300.
A plain woven fabric (weighing 360 g/m 2 ) was knitted using single yarns made of aramid fibers having a thickness of 6000 denier for warp 6 and weft 7, respectively. Figure 4 shows a reinforced material C made of a plain weave fabric 8 made of glass fibers, with a number of filaments of 850.
A plain woven fabric (with a basis weight of 600 g/m 2 ) was knitted using single threads of glass fiber having a thickness of 1200 denier for warp 9 and weft 10, respectively. Next, we will discuss reactive resins useful in carrying out the present invention. In addition to thermosetting resins such as epoxy resins, unsaturated polyesters, and polyimides conventionally used for matrices, polyamides ( Preferred are nylon), polydicyclopentadiene, epoxy resin, unsaturated polyester, silicone resin, polyurethane, and the like. Further, in order to fully explain the content of the present invention, Examples and Comparative Examples will be described below, but these Examples are merely for illustrating the content,
This is not intended to limit the invention. Example 1 A sample was prepared by laminating three pieces of reinforcing material A (weighing 700 g/m 2 ) into pieces of 19 cm long and 31 cm wide as shown in Figure 5, and using bisphenol A type epoxy resin as the reactive resin. (Product name E828: manufactured by Yuka Ciel Epoxy Co., Ltd.), modified alicyclic polyamine (Product name YLH-006: manufactured by Yuka Ciel Epoxy Co., Ltd.) is used as a curing agent, and this resin mixture is added to the container. After thoroughly impregnating and defoaming with a squeeze roller, the sample was placed in a mold (inner volume: 20 cm long x 32 cm wide x 0.3 cm thick). A multilayer structure composite material (reinforcement content
48.4Vol%) was created.
【表】
実施例 ２
強化材A2枚を芯材とし、この裏面両面に強化
材Ｂを夫々１枚宛積層（第６図参照）し、実施例
１と同様にして多層構造複合材料（強化材含有率
59.4Vol％）を作成した。
実施例 ３
強化材A2枚を芯材とし、この表裏両面に強化
材Ｃを夫々１枚宛積層（第７図参照）し、実施例
１と同様にして多層構造複合材料（強化材含有率
49.6Vol％）を作成した。
比較例 １
強化材Ｂを６枚積層（第８図参照）し、実施例
１と同様にして積層構造複合材料（強化材含有率
56.7Vol％）を作成した。
比較例 ２
強化材Ｃを７枚積層（第９図参照）し、実施例
１と同様にして積層構造複合材料（強化材含有率
62.7Vol％）を作成した。
次いで上記の実施例１〜３及び比較例１〜２に
よる複合材料から夫々作成した試験片について、
衝撃強さ（JIS規格Ｋ−7113）及び層間せん断強
さ（ASTM−Ｄ−2344）の試験を行なつた。
この結果は第２表を示す通りである。[Table] Example 2 Two sheets of reinforcing material A were used as the core material, and one sheet of reinforcing material B was laminated on both sides of the back side (see Figure 6), and a multilayer composite material (reinforcing material) was prepared in the same manner as in Example 1. Content rate
59.4Vol%) was created. Example 3 Two pieces of reinforcing material A were used as the core material, and one sheet of reinforcing material C was laminated on both the front and back sides (see Figure 7), and a multilayer structure composite material (reinforcing material content
49.6Vol%) was created. Comparative Example 1 Six sheets of reinforcing material B were laminated (see Figure 8), and a laminated structure composite material (reinforcing material content
56.7Vol%) was created. Comparative Example 2 Seven sheets of reinforcing material C were laminated (see Figure 9), and a laminated structure composite material (reinforcing material content
62.7Vol%) was created. Next, regarding the test pieces made from the composite materials according to Examples 1 to 3 and Comparative Examples 1 to 2, respectively,
Impact strength (JIS standard K-7113) and interlaminar shear strength (ASTM-D-2344) tests were conducted. The results are shown in Table 2.
【表】
この結果、本発明の実施例１〜３は衝撃強さ
200KJ／m2以上、せん断強さ2.50Kg．ｆ／mm2以上
の優れた多層構造複合材料が得られた。
即ち、衝撃強さ及びせん断強さについては、実
施例１にみられる如く、三層構造の編物地１によ
る強化材Ａを単独で３枚積層したときの多層構造
複合材料が最も優れており、然も樹脂液の含浸性
や成型時の型なじみにも優れていることがわかつ
た。
更に強化材Ａを用いた実施例２、３の場合は、
従来法である比較例１及び２の場合と比較してい
ずれも優れた衝撃強さ及びせん断強さを示した。
次に反応射出成形機を用いた場合の実施例並び
に比較例を記載する。
実施例 ４
強化材Ａ（目付700ｇ／m2）を縦39.5cm、横49.5
cmに裁断したものを、第５図の如く３枚積層し、
130℃に保持した反応射出成形金型（内容積：縦
40cm×横50cm×厚さ0.3cm）内に入れ、反応性樹
脂として変性ビスフエノールＡ型エポキシ樹脂
（商品名YL−918：油化シエルエポキシ株式会社
製）、硬化剤としては変性脂環族ポリアミン（商
品名YLH−006：油化シエルエボキシ株式会社
製）を反応比率100対27で混合射出機を用いて混
合液を50Kg／cm2の圧力で注入し、型締圧10Kg／cm
の圧力で５分間保持した結果、含浸性の優れた均
一な多層構造複合材料（強化材含有率48、4Vol
％）が得られた。
実施例 ５
強化材A2枚を芯材とし、この表面両面を強化
材Ｂを夫々１枚宛積層（第６図参照）し、実施例
４と同様に成形したところ、含浸性の優れた均一
な多層構造複合材料（強化材含有率47.6Vol％）
が得られた。
比較例 ３
強化材Ｂを６枚積層（第８図参照）し、実施例
４と同様に成形したところ、同強化材の反応性樹
脂液への抵抗が大きく、そのため強化材が該液に
より押されて金型内で偏在し、強化材の均一な積
層構造複合材料は得られなかつた。
比較例 ４
強化材Ｃを７枚積層（第９図参照）し、実施例
４と同様に成形したところ、比較例３と同様に該
強化材が偏在し、且つ含浸不良部が生じて均一な
積層構造複合材料は得られなかつた。
（効果）
本発明は、上述の如く三層構造の編物地１など
多層構造の編物地による強化材Ａを１枚或いは複
数枚積層するか、又は同強化材Ａと適宜の強化材
を併用、積層した多層構造複合材料が他の織物地
による強化材に比べて衝撃強さ及び層間せん断強
さともに優れており、然も樹脂液の含浸性や成形
時の型なじみにも優れているなど、品質並びに成
形作業性のきわめて優れた多層構造複合材料を得
ることができるのである。[Table] As a result, Examples 1 to 3 of the present invention have impact strength
200KJ/m2 or more , shear strength 2.50Kg. An excellent multilayer composite material with f/mm 2 or higher was obtained. That is, in terms of impact strength and shear strength, as seen in Example 1, the multilayer structure composite material is the best when three layers of reinforcing material A made of the three-layer structure knitted fabric 1 are laminated alone, Moreover, it was found to be excellent in impregnating with resin liquid and conforming to the mold during molding. Furthermore, in the case of Examples 2 and 3 using reinforcing material A,
Both exhibited excellent impact strength and shear strength compared to Comparative Examples 1 and 2, which were conventional methods. Next, Examples and Comparative Examples using a reaction injection molding machine will be described. Example 4 Reinforcement material A (area weight 700 g/m 2 ) was 39.5 cm long and 49.5 cm wide.
Cut into cm pieces and stack 3 sheets as shown in Figure 5.
Reaction injection mold held at 130℃ (inner volume: vertical)
40 cm x width 50 cm x thickness 0.3 cm), modified bisphenol A type epoxy resin (product name YL-918, manufactured by Yuka Ciel Epoxy Co., Ltd.) as the reactive resin, and modified alicyclic polyamine as the curing agent. (Product name YLH-006: manufactured by Yuka Ciel Eboxy Co., Ltd.) using a mixing injection machine at a reaction ratio of 100:27, the mixture was injected at a pressure of 50Kg/ cm2 , and the mold clamping pressure was 10Kg/cm2.
As a result of holding for 5 minutes at a pressure of
%)was gotten. Example 5 Two sheets of reinforcing material A were used as the core material, and one sheet of reinforcing material B was laminated on both surfaces of the core material (see Figure 6), and when molded in the same manner as in Example 4, a uniform sheet with excellent impregnability was obtained. Multilayer composite material (reinforcement content 47.6Vol%)
was gotten. Comparative Example 3 When six sheets of reinforcing material B were laminated (see Figure 8) and molded in the same manner as in Example 4, the reinforcing material had a large resistance to the reactive resin liquid, and therefore the reinforcing material was pushed by the liquid. The reinforcing material was unevenly distributed within the mold, making it impossible to obtain a composite material with a uniform laminated structure. Comparative Example 4 Seven sheets of reinforcing material C were laminated (see Figure 9) and molded in the same manner as in Example 4. As in Comparative Example 3, the reinforcing material was unevenly distributed and poor impregnation areas occurred, resulting in an uneven structure. A laminated composite material could not be obtained. (Effects) As described above, the present invention includes laminating one or more reinforcement materials A made of a multilayered knitted fabric such as the three-layered knitted fabric 1, or using the same reinforcement A and an appropriate reinforcement in combination. The laminated multi-layered composite material has superior impact strength and interlaminar shear strength compared to other textile reinforcement materials, as well as excellent resin liquid impregnation and mold conformability during molding. A multilayer composite material with extremely excellent quality and moldability can be obtained.
図面は本発明の実施例を示したもので、第１図
は編物地の斜視図、第２図は第１図の編物地表面
及び裏面の編組織図、第３図及び第４図は夫々ア
ラミド繊維及びガラス繊維による織物組織図、第
５図〜第９図は夫々実施例及び比較例に用いた強
化材の積層状態を示す断面図である。
１……編物地、５……アラミド繊維の織物地、
８……ガラス繊維の織物地。
The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of a knitted fabric, FIG. 2 is a knitting structure diagram of the front and back sides of the knitted fabric shown in FIG. 1, and FIGS. 3 and 4 are diagrams, respectively. The fabric structure diagrams of aramid fibers and glass fibers, and FIGS. 5 to 9 are cross-sectional views showing the laminated state of reinforcing materials used in Examples and Comparative Examples, respectively. 1...Knitted fabric, 5...Aramid fiber woven fabric,
8...Glass fiber woven fabric.
Claims (1)
該材に反応性樹脂を加え、成形型内で強化材と該
樹脂を一体的に加熱、成形して複合材料を形成す
るように構成したことを特徴とする多層構造複合
材料。1 A multi-layered knitted fabric is used as a component of the reinforcing material,
A multilayered composite material, characterized in that a reactive resin is added to the material, and the reinforcing material and the resin are integrally heated and molded in a mold to form a composite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62065217A JPS63230330A (en) | 1987-03-18 | 1987-03-18 | Multilayer structure composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62065217A JPS63230330A (en) | 1987-03-18 | 1987-03-18 | Multilayer structure composite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63230330A JPS63230330A (en) | 1988-09-26 |
| JPH0362546B2 true JPH0362546B2 (en) | 1991-09-26 |
Family
ID=13280524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62065217A Granted JPS63230330A (en) | 1987-03-18 | 1987-03-18 | Multilayer structure composite material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63230330A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015136498A1 (en) * | 2014-03-13 | 2015-09-17 | Abet Laminati S.P.A. | Method for making a composite board |
| US20190283345A1 (en) * | 2016-07-22 | 2019-09-19 | Sumitomo Bakelite Co., Ltd. | Method for manufacturing sandwhich panel, sandwhich panel, composite material sheet, and curved panel member |
-
1987
- 1987-03-18 JP JP62065217A patent/JPS63230330A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63230330A (en) | 1988-09-26 |
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| EXPY | Cancellation because of completion of term |