JPH0159098B2 - - Google Patents
Info
- Publication number
- JPH0159098B2 JPH0159098B2 JP56089699A JP8969981A JPH0159098B2 JP H0159098 B2 JPH0159098 B2 JP H0159098B2 JP 56089699 A JP56089699 A JP 56089699A JP 8969981 A JP8969981 A JP 8969981A JP H0159098 B2 JPH0159098 B2 JP H0159098B2
- Authority
- JP
- Japan
- Prior art keywords
- foam
- present
- molded
- water
- synthetic resin
- 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
Links
- 239000000463 material Substances 0.000 claims description 22
- 239000006260 foam Substances 0.000 claims description 17
- 229920003002 synthetic resin Polymers 0.000 claims description 11
- 239000000057 synthetic resin Substances 0.000 claims description 11
- 229920001187 thermosetting polymer Polymers 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 description 8
- 238000000465 moulding Methods 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 5
- 229920005830 Polyurethane Foam Polymers 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000011496 polyurethane foam Substances 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/56—After-treatment of articles, e.g. for altering the shape
- B29C44/5618—Impregnating foam articles
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Description
【発明の詳細な説明】
本発明は軽量にして著しい吸音性能を有し、且
つ所望の凹凸形状に成形し得る軽量成形防音材の
製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a lightweight molded soundproofing material that is lightweight, has remarkable sound absorption performance, and can be molded into a desired uneven shape.
従来より建築の分野で、あるいは自動車等の車
輛の分野で連続気泡を有する弾性発泡体が吸音材
として用いられて来ている。例えば自動車のボン
ネツト裏面にも互いに交叉する補強部材により区
分されたボンネツト裏面に直接接着剤を用いてウ
レタン系の発泡体が貼着されて用いられている。
しかしながらこれらの発泡ウレタンはボンネツト
裏面に直接貼着せざるを得ず複雑な補強部材の存
在により貼着面積が限定される欠点を有してい
る。更にエンジンルーム内という限られたスペー
スであるため厚みを増加して吸音性を増加せしめ
る方策にも自から限度があつた。またこま切れの
発泡ウレタンを数多く貼着することは工程上多大
の手間を用し作業性が著しく悪かつた。更にま
た、耐水性、耐オイル性が悪く径時変化によりは
く離等の不具合が生じる等の種々の不具合があり
その改良が強く求められている。 BACKGROUND OF THE INVENTION Conventionally, elastic foams having open cells have been used as sound absorbing materials in the field of architecture and in the field of vehicles such as automobiles. For example, urethane foam is used on the back of an automobile bonnet, which is directly attached with an adhesive to the back of the bonnet divided by reinforcing members that intersect with each other.
However, these urethane foams have the disadvantage that they must be directly attached to the back surface of the bonnet, and the attachment area is limited due to the presence of complicated reinforcing members. Furthermore, since the space within the engine room is limited, there is a limit to the measures that can be taken to increase sound absorption by increasing the thickness. Furthermore, attaching a large number of pieces of urethane foam required a lot of time and effort in the process, and the workability was extremely poor. Furthermore, there are various problems such as poor water resistance and oil resistance, and problems such as peeling due to changes in diameter, and there is a strong demand for improvement.
かかる実状に鑑み本発明者らは鋭意研究の検果
本発明を完成するに至つたものであり、而して本
発明の目的は軽量にして著しい吸音性能を有し、
且つ所望の凹凸形状に、要すれば表被材と１体に
成形し得る軽量成形防音材の製造方法を提供する
ことにある。 In view of these circumstances, the inventors of the present invention have completed the present invention after extensive research, and the purpose of the present invention is to have a light weight and remarkable sound absorbing performance.
Another object of the present invention is to provide a method for producing a lightweight molded soundproofing material that can be molded into a desired uneven shape and, if necessary, integrally with a surface material.
即ち本発明の要旨は、
連続気泡質の弾性発泡体に水溶性あるいは水分
散性の熱硬化性合成樹脂を含浸せしめたのち、張
り出し部の空気流れ抵抗が10〜300dyne・sec／
cm3となる様加熱加圧することを特徴とする軽量成
形防音材の製造方法に存する。 That is, the gist of the present invention is that after impregnating an open-celled elastic foam with a water-soluble or water-dispersible thermosetting synthetic resin, the air flow resistance of the overhanging portion is 10 to 300 dyne·sec/sec.
The present invention relates to a method for producing a lightweight molded soundproofing material, which is characterized by heating and pressurizing it so that the thickness of the lightweight molded soundproofing material reaches cm3 .
本発明になる軽量成形防音材は、例えばボンネ
ツト裏面に装着する場合、ボンネツト周辺部と補
強部材に対応する厚さが約２〜５ｍ／ｍの平坦な
高密度部分と厚さが約３〜50ｍ／ｍで特定範囲の
空気流れ抵抗値を持つ任意形状の張り出し部から
成つており、平坦な高密度部分は軽量成形防音材
に剛性、強度を与え且つボンネツト裏面に装着す
る際のクリツプ止めの基部として働き、任意形状
の張り出し部はボンネツトに接触した形でも良
く、またボンネツトとの間の中空層を形成し、い
わゆる背後空気層を有する形状であつても良いが
共に吸音部として働くものである。 For example, when the lightweight molded soundproofing material of the present invention is attached to the back of a bonnet, it has a flat high-density part with a thickness of about 2 to 5 m/m corresponding to the periphery of the bonnet and the reinforcing member, and a flat high-density part with a thickness of about 3 to 50 m. The flat, high-density part provides rigidity and strength to the lightweight molded soundproofing material and serves as a base for clipping when attached to the underside of the bonnet. The protruding part of any shape may be in contact with the bonnet, or it may be in a shape that forms a hollow layer between it and the bonnet and has a so-called rear air layer, but both act as sound absorbing parts. .
本発明に用い得る発泡体はそのほとんどが連続
気泡性を有することを必須とするもので、独立気
泡であつては吸音性が劣る欠点のみならず、含浸
せしめる熱硬化性合成樹脂がほとんど含浸せず加
熱加圧成形後形状を保持し得ない。また該発泡体
は弾性軟質を有することを必須とするもので、ポ
リスチレン発泡体の如き硬質の発泡体の場合所望
の形状、特に曲面形状が出ず、端部が言わゆるボ
ロボロの状態となるため好ましくない。 Most of the foams that can be used in the present invention must be open-celled, and closed-celled foams not only have poor sound absorption properties, but also impregnated with almost no thermosetting synthetic resin. The shape cannot be maintained after hot-pressure molding. In addition, the foam must be elastic and soft, and in the case of a hard foam such as polystyrene foam, the desired shape, especially a curved shape, cannot be obtained, and the edges become tattered. Undesirable.
発泡体の材質としては熱硬化性合成樹脂系の発
泡体が良く、特にはポリウレタン系のものが最も
好ましい。比重0.01〜0.10ｇ／cm3、気泡数４×102
〜４×104個／cm3、引張強さ0.5〜170Kg／cm2、10
％変形の圧縮応力７〜175Kg／cm2のポリウレタン
系発泡体を用い得る。 The material of the foam is preferably a thermosetting synthetic resin foam, with polyurethane foam being most preferred. Specific gravity 0.01-0.10g/cm 3 , number of bubbles 4×10 2
~4×10 4 pieces/cm 3 , tensile strength 0.5-170Kg/cm 2 , 10
A polyurethane foam having a compressive stress of 7 to 175 Kg/cm 2 at % deformation may be used.
連続気泡質の弾性発泡体に成形性と形状保持性
を与える熱硬化性合成樹脂としてはフエノール樹
脂、尿素樹脂、メラミン樹脂等であつて良く、好
ましくは水溶性あるいは水分散型の速硬化性のも
のである。 The thermosetting synthetic resin that provides moldability and shape retention to the open-cell elastic foam may be phenolic resin, urea resin, melamine resin, etc., and preferably a water-soluble or water-dispersible fast-curing resin. It is something.
熱硬化性合成樹脂の含浸量は、重量比で言えば
発泡体重量に対して樹脂固形分で約３〜50重量％
である。本発明の軽量成形防音材は連続気泡質で
あることを必須とするものであり熱硬化性合成樹
脂の含浸容量は溶媒の揮散後発泡体の中空容積に
対して約10〜60％である。含浸容量が10％以下の
場合成形後、形状を保持し得ず、60％以上の場合
空気流れ抵抗が300dyne・sec／cm3以上となり、
即ち通気性が実質的に無くなり吸音性は著しく低
下する。 The amount of thermosetting synthetic resin impregnated is approximately 3 to 50% by weight of resin solids based on the foam weight.
It is. The lightweight molded soundproofing material of the present invention must have open cells, and the impregnation capacity of the thermosetting synthetic resin is approximately 10 to 60% of the hollow volume of the foam after volatilization of the solvent. If the impregnated capacity is less than 10%, it will not be able to maintain its shape after molding, and if it is more than 60%, the air flow resistance will be more than 300dyne・sec/ cm3 ,
That is, air permeability is substantially eliminated and sound absorption properties are significantly reduced.
水分散型の含浸液を使用した場合、ロール等の
間を通してしぽり取つたのち風乾するか80〜100
℃で１〜５分間程度の乾操を加え水分を揮散せし
めて取り扱い易い状態となしておくことは好まし
い。 When using a water-dispersed impregnating liquid, pass it between rolls, etc., and then air dry it.
It is preferable to dry it at a temperature of about 1 to 5 minutes to volatilize the moisture and make it easy to handle.
本発明の軽量成形防音材に不織布等からなる表
被材を施すことは防げない。これらの表被材は加
熱加圧成形時に同時に一体成形し得るものであ
る。 It is impossible to prevent the lightweight molded soundproofing material of the present invention from being provided with a surface material made of nonwoven fabric or the like. These surface materials can be integrally molded at the same time during heat and pressure molding.
本発明の軽量成形防音材は熱硬化性合成樹脂を
含浸した弾性発泡体を任意の凹凸形状を有する金
型を用い含浸した熱硬化性合成樹脂の硬化反応温
度以上の温度での加熱状態で圧縮成形して得られ
るものである。即ち温度100〜250℃の加熱状態
で、約30秒間から５分間、１〜20Kg／cm2の加圧力
にして成形すれば良い。 The lightweight molded soundproofing material of the present invention is made by compressing an elastic foam impregnated with a thermosetting synthetic resin in a heated state at a temperature higher than the curing reaction temperature of the impregnated thermosetting synthetic resin using a mold having an arbitrary uneven shape. It is obtained by molding. That is, the molding may be carried out under heating at a temperature of 100 to 250° C. for about 30 seconds to 5 minutes and at a pressure of 1 to 20 kg/cm 2 .
これらの成形防音材は任意の凹凸形状に成形可
能で形状保持性を附与する高密度部分と吸音機能
として働く低密度の張り出し部とからなり張り出
し部は10〜300dyne・sec／cm3の空気流れ抵抗を
有することが必要である。即ち本発明は、硬質部
分と軟質部分を１つの成形体中に同時に有し自動
車のボンネツト裏面等にクリツプ等の手段で簡単
に装着出来、しかも軟質部分ですぐれた吸音性能
を顕現し得るものである。更に又、インジエワシ
ヨン方式とは異り通気性のある表被材を同時に一
体成形し得る利便もある。しかも重量は約250〜
600ｇ／m2と極めて軽量で、自動車用の吸音材と
して用いた場合自動車の軽量化、延いては自動車
の燃費改善に大いに寄与し得るものである。 These molded soundproofing materials can be molded into any uneven shape and consist of a high-density part that provides shape retention and a low-density overhang that acts as a sound absorption function.The overhang has an air content of 10 to 300 dyne・sec/cm It is necessary to have flow resistance. That is, the present invention has a hard part and a soft part in one molded body, which can be easily attached to the back of the hood of an automobile by means of clips, etc., and which can exhibit excellent sound absorption performance in the soft part. be. Furthermore, unlike the in-jet sewing method, there is the advantage that a breathable surface material can be integrally molded at the same time. Moreover, the weight is about 250 ~
It is extremely lightweight at 600g/m 2 , and when used as a sound absorbing material for automobiles, it can greatly contribute to reducing the weight of automobiles and, by extension, improving the fuel efficiency of automobiles.
これらの本発明になる軽量成形防音材はボンネ
ツトの形状に即して一体化されておりクリツプ止
め等の手段によりワンタツチで装着出来るもので
ある。 These lightweight molded soundproofing materials according to the present invention are integrated to conform to the shape of the bonnet, and can be installed with a single touch using clips or other means.
また通気性はあるが通水性の少い表被材をずい
時選択し一体成形することにより耐水性、耐オイ
ル性を著しく向上し得るものである。 Furthermore, by selecting and integrally molding a cover material that is breathable but has low water permeability, water resistance and oil resistance can be significantly improved.
以下に実施例を挙げ本発明のより詳細な理解に
供する。当然のことながら本発明は以下の実施例
のみに限定されるものではない。 Examples are given below to provide a more detailed understanding of the present invention. Naturally, the present invention is not limited to the following examples.
実施例
市販のポリエステル系ポリウレタンフオーム
（エバーライトSM ボリヂストンタイヤ製、密
度0.04ｇ／cm3、連続気泡、伸び340％、10％変形
の圧縮応力30Kg／cm3、引張強さ1.8Kg／cm3）を水
分散型フエノール樹脂（BRS−330昭和ユニオン
合成株式会社製）中に浸漬したのち引き上げ約５
ｍ／ｍ間隔のロールの間を通してしぼつたのち、
約60分間風乾し、次いで100℃で約３分間の熱風
加熱を行つた。この段階で重量を測定した所440
ｇ／m2であり、このものの断面を顕微鏡で測定し
たところ発泡体の中空容積に対して約14％の熱硬
化性合成樹脂が含浸されていた。Example Commercially available polyester polyurethane foam (Everlight SM manufactured by Bridgestone Tire, density 0.04 g/cm 3 , open cell, elongation 340%, compressive stress at 10% deformation 30 Kg/cm 3 , tensile strength 1.8 Kg/cm 3 ) was immersed in water-dispersed phenolic resin (BRS-330 manufactured by Showa Union Gosei Co., Ltd.) and then pulled out for approximately 5 minutes.
After squeezing through rolls with m/m spacing,
It was air-dried for about 60 minutes, and then heated with hot air at 100°C for about 3 minutes. At this stage, the weight was measured at 440
g/m 2 , and when the cross section of this material was measured using a microscope, it was found that about 14% of the hollow volume of the foam was impregnated with thermosetting synthetic resin.
前記にて得た熱硬化性合成樹脂含浸のポリウレ
タンフオームに樹脂綿を表被材として積層し、次
いてボンネツトの型より交差する補強部材により
四区分されるほぼ平面な部分に対応せしめて成形
体の厚さを除いた高さを20ｍ／ｍとした概ね角錐
台状の四個所の厚さ10ｍ／ｍの張り出し部を設
け、また該補強部材部および成形体の周囲に対応
せしめて平坦部を厚さ２ｍ／ｍに設ける如く、
200℃の加熱条件下に３Kg／cm2の加圧力にて約１
分間圧縮成形した。該張り出し部の部の空気流れ
抵抗は約190dyme・sec／cm3であつた。 Resin cotton is laminated as a surface material on the polyurethane foam impregnated with thermosetting synthetic resin obtained above, and then a molded body is formed by forming a molded article corresponding to the substantially flat portion divided into four sections by reinforcing members intersecting from the mold of the bonnet. Four protruding parts each having a thickness of 10 m/m are provided at four locations, approximately in the shape of a truncated pyramid with a height of 20 m/m excluding the thickness of As provided at a thickness of 2m/m,
Approximately 1 at a pressure of 3Kg/cm 2 under heating conditions of 200℃
Compression molded for minutes. The air flow resistance at the overhang portion was approximately 190 dyme·sec/cm 3 .
この軽量成形防音材を自動車のボンネツト裏面
の四辺および補強部材の交差部にビス止めして装
着した。このものの吸音率を残響室法により測定
したところ次の如く秀れていた。又この軽量成形
防音材を装着した自動車の実車走行の結果、本発
明になる成形体にはタレ下がり現象はまつたく認
められなかつた。 This lightweight molded soundproofing material was attached to the four sides of the underside of the hood of an automobile and at the intersection of the reinforcing members with screws. When the sound absorption coefficient of this product was measured using the reverberation chamber method, it was excellent as shown below. Further, as a result of actual driving of a car equipped with this lightweight molded soundproofing material, no sagging phenomenon was observed in the molded article of the present invention.
周波数 吸音率 250Hz 50％ 500Hz 46％ 1000Hz 72％ 2000Hz 96％ 4000Hz 99％Frequency Sound absorption coefficient 250Hz 50% 500Hz 46% 1000Hz 72% 2000Hz 96% 4000Hz 99%
Claims (1)
分散性の熱硬化性合成樹脂を含浸せしめたのち、
張り出し部の空気流れ抵抗が10〜300dyne・
sec／cm3となる様加熱加圧することを特徴とする
軽量成形防音材の製造方法。1 After impregnating an open-celled elastic foam with a water-soluble or water-dispersible thermosetting synthetic resin,
The air flow resistance of the overhang is 10 to 300dyne.
A method for producing a lightweight molded soundproofing material, which is characterized by heating and pressurizing it so that it becomes sec/ cm3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8969981A JPS57205125A (en) | 1981-06-12 | 1981-06-12 | Manufacture of light weight sound insulating molded material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8969981A JPS57205125A (en) | 1981-06-12 | 1981-06-12 | Manufacture of light weight sound insulating molded material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57205125A JPS57205125A (en) | 1982-12-16 |
| JPH0159098B2 true JPH0159098B2 (en) | 1989-12-14 |
Family
ID=13978011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8969981A Granted JPS57205125A (en) | 1981-06-12 | 1981-06-12 | Manufacture of light weight sound insulating molded material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57205125A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02200421A (en) * | 1989-01-31 | 1990-08-08 | Dainichiseika Color & Chem Mfg Co Ltd | Porous composite material, preparation thereof and molded body |
| CN108676195A (en) * | 2018-04-16 | 2018-10-19 | 安徽昊森新材料科技有限公司 | A kind of light sound-proof phenolic resin |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55133931A (en) * | 1979-04-05 | 1980-10-18 | Wako Chem Kk | Preparing method for small-type formed ceiling for automobile, vessel, house, etc., and its product |
-
1981
- 1981-06-12 JP JP8969981A patent/JPS57205125A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55133931A (en) * | 1979-04-05 | 1980-10-18 | Wako Chem Kk | Preparing method for small-type formed ceiling for automobile, vessel, house, etc., and its product |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57205125A (en) | 1982-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0182810B2 (en) | Thermoformable composite articles | |
| JP2821899B2 (en) | Sound insulation structure and method of manufacturing the same | |
| US4479992A (en) | Sound absorbing structural element | |
| JP3304264B2 (en) | Automotive body panel insulator | |
| US5493081A (en) | Panel that absorbs acoustic energy at low, medium and high frequencies, particularly at frequencies ranging from 400 Hz to 5,000 Hz | |
| US5049439A (en) | Thermoformable article | |
| US20060090958A1 (en) | Thermoformable acoustic product | |
| JPH02165942A (en) | Roof liner having improved | |
| JPH0349749B2 (en) | ||
| EP0286058A2 (en) | Composite load-bearing structural element and relative manufacturing process | |
| US3193440A (en) | Laminated articles and laminating preforms therefor | |
| US8142689B2 (en) | Fire retardancy and shape retention reinforced polyester | |
| JPH0159098B2 (en) | ||
| JPH03277537A (en) | Sound absorption and damping material and production thereof | |
| JP7322631B2 (en) | Method for manufacturing vehicle interior material | |
| JPH0520495Y2 (en) | ||
| JP3067511B2 (en) | Phenolic resin laminate and method for producing phenolic resin molded article using the same | |
| JPH0667676A (en) | Corrugated sound absorbing material | |
| JPS5828112B2 (en) | Naisou Youtrimzai | |
| JPH01308623A (en) | Manufacture of fiber molded form | |
| JP3538293B2 (en) | Sound insulation structure | |
| JPH07287581A (en) | Sound insulating material for automobile | |
| US5198169A (en) | Process for the forming of a covering element for vehicle interiors | |
| KR200251584Y1 (en) | Composite material for vehicle insulation | |
| JPH01207459A (en) | Production of light-weight structural material |