JP2002331625A - Laminate - Google Patents
LaminateInfo
- Publication number
- JP2002331625A JP2002331625A JP2001138734A JP2001138734A JP2002331625A JP 2002331625 A JP2002331625 A JP 2002331625A JP 2001138734 A JP2001138734 A JP 2001138734A JP 2001138734 A JP2001138734 A JP 2001138734A JP 2002331625 A JP2002331625 A JP 2002331625A
- Authority
- JP
- Japan
- Prior art keywords
- laminate
- layer
- inner layer
- outer layer
- intermediate 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.)
- Granted
Links
Landscapes
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、積層体に関し、
特には車両用吸音材として好適な積層体に関する。TECHNICAL FIELD The present invention relates to a laminate,
In particular, the present invention relates to a laminate suitable as a vehicle sound absorbing material.
【０００２】[0002]
【従来の技術】車両には、主としてエンジン音による車
外騒音を低減させるための吸音材が、車体等に装着され
ている。従来、前記吸音材として、ポリウレタン発泡体
からなる内層の両側にバインダーの含浸したガラス繊維
層を介して外層を積層し、それらの積層部材をヒートロ
ーラにより加熱圧縮し、前記バインダーの硬化により各
部材を一体化するとともに形状固定した積層体が知られ
ている。2. Description of the Related Art In a vehicle, a sound absorbing material for reducing external noise mainly due to engine noise is mounted on a vehicle body or the like. Conventionally, as the sound absorbing material, an outer layer is laminated on both sides of an inner layer made of a polyurethane foam via a glass fiber layer impregnated with a binder, and these laminated members are heated and compressed by a heat roller, and each member is cured by curing the binder. There is known a laminate in which the shape is fixed and the shape is fixed.
【０００３】ところで、前記車両用吸音材には、吸音性
のみならず、燃費向上の点から軽量性、さらには最近の
廃棄物削減や省資源の観点からリサイクル性が要求され
るようになった。Meanwhile, the sound absorbing material for vehicles has been required to have not only sound absorbing properties but also light weight in terms of improving fuel efficiency, and recyclability in view of recent waste reduction and resource saving. .
【０００４】しかし、従来のガラス繊維を含む積層体に
あっては、ガラス繊維を含むために重くなり、軽量化も
容易ではなかった。また、リサイクルするために、粉砕
や破砕処理を行おうとすると、ガラス繊維によって粉砕
装置における刃の摩耗が著しく、しかも空気中にガラス
繊維が飛散して作業環境の悪化を生じる問題がある。さ
らに、リサイクル品もガラス繊維の混入により重くな
り、リサイクル品の用途によっては好ましくないことが
ある。また、前記積層体を焼却処理しても、ガラスが残
り、処理に困る問題がある。[0004] However, the conventional laminated body containing glass fibers is heavy due to the inclusion of glass fibers, and it is not easy to reduce the weight. Further, when crushing or crushing is performed for recycling, there is a problem that the blades in the crushing device are significantly worn by the glass fibers, and the glass fibers are scattered in the air, thereby deteriorating the working environment. Furthermore, recycled products also become heavier due to the incorporation of glass fibers, which may be undesirable depending on the use of the recycled products. Further, there is a problem that even if the laminate is incinerated, glass remains, which makes the treatment difficult.
【０００５】[0005]
【発明が解決しようとする課題】この発明は、前記の点
に鑑み提案されたものであって、吸音性及び形状保持性
並びに剛性を損なうことなく、リサイクルに適し、かつ
軽量な積層体を提供するものである。SUMMARY OF THE INVENTION The present invention has been proposed in view of the above points, and provides a lightweight and lightweight laminate suitable for recycling without impairing sound absorption, shape retention, and rigidity. Is what you do.
【０００６】[0006]
【課題を解決するための手段】請求項１の発明は、発泡
体からなる内層の両側に中間層を介して外層が積層一体
化された積層体において、前記中間層がポリプロピレン
繊維からなり、前記ポリプロピレン繊維の溶着によって
内層、中間層及び外層が一体化されていることを特徴と
する。According to a first aspect of the present invention, there is provided a laminate in which an outer layer is integrally laminated on both sides of an inner layer made of a foam with an intermediate layer interposed therebetween, wherein the intermediate layer is made of polypropylene fiber, The inner layer, the intermediate layer, and the outer layer are integrated by welding polypropylene fibers.
【０００７】請求項２の発明は、請求項１において、中
間層がポリプロピレン繊維の不織布からなることを特徴
とする。A second aspect of the present invention is characterized in that, in the first aspect, the intermediate layer is made of a nonwoven fabric of polypropylene fibers.
【０００８】請求項３の発明は、請求項１または２にお
いて、内層が通気性を有するポリウレタン発泡体、外層
が溶融樹脂の含浸可能な材質からなって、中間層を構成
するポリプロピレン繊維の溶融樹脂が前記外層に含浸硬
化していることを特徴とする。A third aspect of the present invention is the method according to the first or second aspect, wherein the inner layer is made of a polyurethane foam having air permeability, and the outer layer is made of a material that can be impregnated with the molten resin. Is characterized in that the outer layer is impregnated and cured.
【０００９】請求項４の発明は、請求項１から３のいず
れか１項において、内層及び外層が難燃性を有するもの
であることを特徴とする。According to a fourth aspect of the present invention, in any one of the first to third aspects, the inner layer and the outer layer have flame retardancy.
【００１０】[0010]
【発明の実施の形態】以下添付の図面に従ってこの発明
を詳細に説明する。図１はこの発明の一実施例に係る積
層体の断面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of a laminate according to an embodiment of the present invention.
【００１１】図１に示すこの発明の一実施例である積層
体１０は、車両のボンネット裏面に貼着される吸音材と
して使用されるものであって、内層１１の両側に中間層
１２を介して外層１３が積層一体化されたものからな
る。A laminated body 10 according to an embodiment of the present invention shown in FIG. 1 is used as a sound absorbing material adhered to the back of a hood of a vehicle, and has an intermediate layer 12 on both sides of an inner layer 11. The outer layer 13 is formed by lamination and integration.
【００１２】内層１１は発泡体で構成される。前記内層
１１を構成する発泡体としては、公知の発泡体であれば
何ら限定されるものではないが、通気性を有するポリウ
レタン発泡体が吸音性及び軽量性に優れるために好まし
い。通気性を有するポリウレタン発泡体としては、連続
気泡構造を主体とする軟質ポリウレタン発泡体を挙げる
ことができる。The inner layer 11 is made of a foam. The foam constituting the inner layer 11 is not particularly limited as long as it is a known foam, but a polyurethane foam having air permeability is preferable because of its excellent sound absorption and lightness. Examples of the polyurethane foam having air permeability include a flexible polyurethane foam mainly having an open-cell structure.
【００１３】また、この積層体１０が貼着される車両の
ボンネットは高温になるため、前記内層１１の発泡体と
しては、難燃性を有するものが好ましい。前記難燃性を
有する発泡体として、有機ハロゲン化合物等からなる難
燃剤の添加やその他の難燃化処理等によって難燃性の付
与された、あるいは難燃性の高められた難燃性軟質ポリ
ウレタンフォームが好適である。Since the bonnet of the vehicle to which the laminate 10 is attached becomes hot, the foam of the inner layer 11 is preferably flame retardant. As the flame-retardant foam, a flame-retardant flexible polyurethane to which flame retardancy has been imparted by addition of a flame retardant comprising an organic halogen compound or the like or other flame retardation treatment, or flame retardancy has been enhanced Foams are preferred.
【００１４】さらに、前記内層１１を構成する発泡体
は、通気抵抗（ＪＩＳ Ｋ ６４００準拠）が５〜１５
０ｃｍ3／（ｃｍ2・ｓｅｃ）にある広範囲のものから選
択することができる。従来、吸音用の発泡体としては、
通気抵抗が１００ｃｍ3／（ｃｍ2・ｓｅｃ）を超えるも
のは吸音効果が低く、不適当であるとされていたが、こ
の発明では、外層１３に加えてポリプロピレン繊維から
なる中間層１２を有するため、中間層１２の目付量を調
整することによって、前記通気抵抗が１００〜１５０ｃ
ｍ3／（ｃｍ2・ｓｅｃ）の発泡体についても優れた吸音
特性が得られるようになった。Further, the foam constituting the inner layer 11 has a ventilation resistance (based on JIS K 6400) of 5 to 15.
It can be selected from a wide range at 0 cm 3 / (cm 2 · sec). Conventionally, as a foam for sound absorption,
Those having a ventilation resistance of more than 100 cm 3 / (cm 2 · sec) have been considered to have a low sound-absorbing effect and are unsuitable. However, in the present invention, since an intermediate layer 12 made of polypropylene fibers is provided in addition to the outer layer 13. By adjusting the basis weight of the intermediate layer 12, the airflow resistance is 100 to 150c.
Excellent sound absorbing properties can be obtained even for foams of m 3 / (cm 2 · sec).
【００１５】中間層１２は、公知のポリプロピレン繊維
からなる。前記ポリプロピレン繊維は、前記内層１１、
中間層１２及び外層１３を積層して熱プレスによってこ
の積層体１０を製造する際に溶融し、その溶融樹脂（溶
融ポリプロピレン樹脂）によって各層を溶着一体化する
とともに積層体１０の剛性を高めるものである。また、
このポリプロピレン繊維は、積層体１０製造時における
中間層１２の取り扱い容易性の点及び積層体１０の剛性
増大の点から不織布、その中でもスパンボンド法により
製造されたポリプロピレン製スパンボンド不織布が好ま
しい。このスパンポンド不織布は軽量性に優れるのみな
らず、水分による伸縮がなく、しかも連続繊維からなる
ため端部でのほつれがないので、車両用吸音材とされる
この積層体１０には好適なものである。このようなポリ
プロピレン製スパンボンド不織布の例として、目付４０
ｇ／ｍ2、商品名：ストラテックＲＷ２０４０（出光石
油化学社製）ポリプロピレン製）が挙げられる。The mid layer 12 is made of a known polypropylene fiber. The polypropylene fiber comprises the inner layer 11,
The intermediate layer 12 and the outer layer 13 are laminated and melted when the laminated body 10 is manufactured by hot pressing, and the respective layers are welded and integrated by the molten resin (molten polypropylene resin) and the rigidity of the laminated body 10 is increased. is there. Also,
The polypropylene fiber is preferably a nonwoven fabric, in particular, a polypropylene spunbonded nonwoven fabric produced by a spunbonding method, from the viewpoint of easy handling of the intermediate layer 12 and the increase in rigidity of the laminate 10 during the production of the laminate 10. This spun-pound nonwoven fabric is not only excellent in lightness, but also does not expand and contract due to moisture, and because it is made of continuous fibers, there is no fraying at the ends. It is. As an example of such a polypropylene spunbonded nonwoven fabric, a basis weight of 40
g / m 2 , trade name: Stratec RW2040 (manufactured by Idemitsu Petrochemical Co., Ltd., polypropylene).
【００１６】外層１３は、主としてこの積層体１０の剛
性を高めるとともに表面を保護するためのもので、溶融
樹脂の含浸可能な材質で構成される。このように溶融樹
脂の含浸可能な材質とすれば、この積層体１０の製造に
際して行われる熱プレス時に、中間層１２のポリプロピ
レン繊維が溶融し、その溶融したポリプロピレン樹脂が
外層１３に含浸して硬化するため、得られる積層体１０
の剛性が高いものとなり、ガラス繊維を用いなくても十
分に剛性の高い積層体１０が得られる。The outer layer 13 mainly serves to increase the rigidity of the laminate 10 and protect the surface thereof, and is made of a material that can be impregnated with a molten resin. With a material that can be impregnated with the molten resin, the polypropylene fibers of the intermediate layer 12 are melted during the hot pressing performed in the production of the laminate 10 and the melted polypropylene resin is impregnated into the outer layer 13 and cured. The resulting laminate 10
And the laminate 10 having sufficiently high rigidity can be obtained without using glass fibers.
【００１７】前記外層１３としては、不織布が好適であ
る。この外層１３を構成する不織布の例として、ポリオ
レフィン、ポリエステル、ポリアミド、ポリ塩化ビニ
ル、アクリル系共重合体、ポリスチレン、ポリウレタン
等のポリマーからなる繊維で構成されたものが挙げられ
る。さらに、前記外層１３は、難燃性を有するものが好
ましい。この難燃性を有する外層１３としては、塩素化
有機燐化合物等により公知の難燃化処理を施した不織布
を挙げることができる。市販されている難燃性不織布と
して、目付５０ｇ／ｍ2、商品名ＲＦ１０５０（旭化成
製）、目付４０ｇ／ｍ2、商品名ラスタン（旭化成製）
を挙げることができる。As the outer layer 13, a non-woven fabric is preferable. Examples of the non-woven fabric forming the outer layer 13 include a non-woven fabric formed of a polymer such as polyolefin, polyester, polyamide, polyvinyl chloride, acrylic copolymer, polystyrene, or polyurethane. Further, the outer layer 13 preferably has flame retardancy. As the outer layer 13 having flame retardancy, a nonwoven fabric which has been subjected to a known flame retarding treatment with a chlorinated organic phosphorus compound or the like can be used. As a flame retardant nonwoven fabric that is commercially available, basis weight 50 g / m 2, trade name RF1050 (manufactured by Asahi Kasei), basis weight 40 g / m 2, trade name Rasutan (manufactured by Asahi Kasei)
Can be mentioned.
【００１８】次に前記積層体１０の製造例を説明する。
前記積層体１０の製造は、前記内層１１の両側に中間層
１２を介して外層１３を積層し、その積層状態で外層１
３外面側から、所要形状の熱板等で熱プレスすることに
より行われる。その際の熱プレス温度は、通常１５０〜
２１０℃とされる。Next, an example of manufacturing the laminate 10 will be described.
In manufacturing the laminate 10, an outer layer 13 is laminated on both sides of the inner layer 11 via an intermediate layer 12, and the outer layer 1 is laminated in the laminated state.
3 From the outer surface side, hot pressing is performed with a hot plate or the like having a required shape. The hot press temperature at that time is usually 150 to
210 ° C.
【００１９】前記熱プレス時、前記内層１１と外層１３
間に位置する中間層１２のポリプロピレン繊維が溶融
し、その溶融したポリプロピレン樹脂が外層１３と内層
１１に溶着することによって内層１１、中間層１２及び
外層１３が一体化し、所要形状に固定された前記積層体
１０になる。前記中間層１２が溶融した溶融ポリプロピ
レン樹脂は、従来用いられている液状バインダーよりも
粘度が高いために内層１１内への含浸程度が低い。しか
も前記各層の積層後から熱プレス前までの間、前記中間
層１２のポリプロピレン繊維は溶融していないので内層
１１内へ含浸するおそれがない。これらのことから、前
記熱プレスにより製造された積層体１０は、内層１１内
への溶融ポリプロピレン樹脂の含浸硬化による内層１１
の吸音性低下を生じ難く、良好な吸音性を発揮すること
ができる。During the hot pressing, the inner layer 11 and the outer layer 13
The polypropylene fiber of the intermediate layer 12 located in between is melted, and the melted polypropylene resin is welded to the outer layer 13 and the inner layer 11, whereby the inner layer 11, the intermediate layer 12 and the outer layer 13 are integrated and fixed to a required shape. The laminate 10 is obtained. The molten polypropylene resin in which the intermediate layer 12 has been melted has a higher viscosity than a conventionally used liquid binder, and therefore has a low degree of impregnation into the inner layer 11. Moreover, since the polypropylene fibers of the intermediate layer 12 are not melted from after the lamination of the respective layers to before the hot pressing, there is no possibility of impregnation into the inner layer 11. From these facts, the laminated body 10 manufactured by the hot press is hardened by impregnating and curing the inner layer 11 with the molten polypropylene resin.
Is less likely to cause a decrease in sound absorbing property, and a good sound absorbing property can be exhibited.
【００２０】さらに、前記内層１１の発泡体は、通気抵
抗が５〜１５０ｃｍ3／（ｃｍ2・ｓｅｃ）の範囲におい
て、気孔を小さくすれば、前記溶融ポリプロピレン樹脂
が内層１１内に益々含浸し難くなって、吸音性低下を防
止でき、良好な吸音性を得ることができるようになる。Furthermore, if the pores of the foam of the inner layer 11 are reduced in a range of 5-150 cm 3 / (cm 2 · sec), the molten polypropylene resin is less likely to be impregnated into the inner layer 11. As a result, it is possible to prevent a decrease in sound absorption, and to obtain a good sound absorption.
【００２１】また、前記溶融ポリプロピレン樹脂が内層
１１と外層１３に溶着して硬化するため、得られる積層
体１０の剛性が高いものとなる。さらに、前記外層１３
を溶融樹脂の含浸するものとすれば、前記溶融ポリプロ
ピレン樹脂が外層１３内に含浸して硬化するため、外層
１３の剛性が向上し、積層体１０全体の剛性も大幅に増
大する。Further, since the molten polypropylene resin is welded to the inner layer 11 and the outer layer 13 and hardened, the obtained laminate 10 has high rigidity. Further, the outer layer 13
Is impregnated with a molten resin, the molten polypropylene resin is impregnated in the outer layer 13 and hardened, so that the rigidity of the outer layer 13 is improved and the rigidity of the entire laminate 10 is also greatly increased.
【００２２】さらにまた、前記内層１１を構成する前記
ポリウレタン発泡体３１及び外層１３を構成する不織布
３３が、難燃性を有するものであれば、前記積層体１０
は、車両のボンネットのような高温環境にも、一層好適
なものとなる。Furthermore, if the polyurethane foam 31 constituting the inner layer 11 and the non-woven fabric 33 constituting the outer layer 13 have flame retardancy, the laminate 10
Is more suitable for a high temperature environment such as a hood of a vehicle.
【００２３】なお、前記実施例の説明では車両用の吸音
材について説明したが、この発明は車両用吸音材に限定
されるものではない。Although the sound absorbing material for a vehicle has been described in the above embodiment, the present invention is not limited to the sound absorbing material for a vehicle.
【００２４】[0024]
【発明の効果】以上図示し説明したように、請求項１の
積層体によれば、従来のガラス繊維に代えてポリピロピ
レン繊維からなる中間層を用い、該ポリプロピレン繊維
の溶着によって内層、中間層及び外層を一体化させたも
のであって、ガラス繊維を用いる必要がないため、リサ
イクルに適し、さらに吸音性、形状保持性並びに剛性を
損なわず、軽量性にも優れる。したがって、この発明の
積層体は、軽量性の要求される用途、例えば車両用吸音
材等に好適なものとなる。As described above, according to the laminate of the first aspect, an intermediate layer made of polypropylene fibers is used in place of the conventional glass fiber, and the inner layer, the intermediate layer and the intermediate layer are formed by welding the polypropylene fibers. Since the outer layer is integrated and there is no need to use glass fibers, it is suitable for recycling, and does not impair the sound absorption, shape retention and rigidity, and is excellent in lightness. Therefore, the laminate of the present invention is suitable for applications requiring lightness, such as sound absorbing materials for vehicles.
【００２５】また、請求項２の積層体によれば、中間層
がポリプロピレン繊維の不織布からなるため、積層体の
製造が容易で、しかも積層体の剛性を高めやすくなる。According to the laminate of the second aspect, since the intermediate layer is made of a nonwoven fabric of polypropylene fibers, the production of the laminate is easy and the rigidity of the laminate is easily increased.
【００２６】さらに、請求項３の発明によれば、内層が
通気性を有するポリウレタン発泡体、外層が溶融樹脂の
含浸可能な材質からなって、中間層を構成するポリプロ
ピレン繊維の溶融樹脂が前記外層に含浸硬化しているた
め、ガラス繊維を用いなくても、十分に積層体の剛性を
高めることができる。According to the third aspect of the present invention, the inner layer is made of a polyurethane foam having air permeability, and the outer layer is made of a material that can be impregnated with the molten resin. , The rigidity of the laminate can be sufficiently increased without using glass fibers.
【００２７】さらにまた、請求項４の発明によれば、内
層及び外層が難燃性を有するものであるため、車体で最
も高温となるエンジン周りの吸音材としても好適な積層
体が得られる。Further, according to the fourth aspect of the present invention, since the inner layer and the outer layer have flame retardancy, a laminated body suitable as a sound absorbing material around an engine, which has the highest temperature in a vehicle body, can be obtained.
【図１】この発明の一実施例に係る積層体の断面図であ
る。FIG. 1 is a sectional view of a laminate according to an embodiment of the present invention.
１０ 積層体 １１ 内層 １２ 中間層 １３ 外層 Reference Signs List 10 laminated body 11 inner layer 12 intermediate layer 13 outer layer
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3D023 BA03 BB21 BE06 4F100 AK07B AK07C AK51A AT00D AT00E BA05 BA06 BA10D BA10E DG01B DG01C DG15B DG15C DJ01A EC03 GB32 JH01 JJ07A JJ07D JJ07E JK01 JL16 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)
Claims (4)
して外層が積層一体化された積層体において、 前記中間層がポリプロピレン繊維からなり、前記ポリプ
ロピレン繊維の溶着によって内層、中間層及び外層が一
体化されていることを特徴とする積層体。1. A laminate in which an outer layer is laminated and integrated on both sides of an inner layer made of a foam with an intermediate layer interposed therebetween, wherein the intermediate layer is made of polypropylene fibers, and the inner layer, the intermediate layer, and the outer layer are formed by welding the polypropylene fibers. Wherein the laminate is integrated.
らなることを特徴とする請求項１記載の積層体。2. The laminate according to claim 1, wherein the intermediate layer is made of a nonwoven fabric of polypropylene fibers.
体、外層が溶融樹脂の含浸可能な材質からなって、中間
層を構成するポリプロピレン繊維の溶融樹脂が前記外層
に含浸硬化していることを特徴とする請求項１又は２記
載の積層体。3. An inner layer is made of a polyurethane foam having air permeability, and an outer layer is made of a material impregnable with a molten resin, and the outer layer is impregnated and cured with a molten resin of polypropylene fibers constituting an intermediate layer. The laminate according to claim 1 or 2, wherein
ることを特徴とする請求項１から３のいずれか１項に記
載の積層体。4. The laminate according to claim 1, wherein the inner layer and the outer layer have flame retardancy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001138734A JP4623541B2 (en) | 2001-05-09 | 2001-05-09 | Sound absorbing material for vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001138734A JP4623541B2 (en) | 2001-05-09 | 2001-05-09 | Sound absorbing material for vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002331625A true JP2002331625A (en) | 2002-11-19 |
| JP4623541B2 JP4623541B2 (en) | 2011-02-02 |
Family
ID=18985625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001138734A Expired - Fee Related JP4623541B2 (en) | 2001-05-09 | 2001-05-09 | Sound absorbing material for vehicles |
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| Country | Link |
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| JP (1) | JP4623541B2 (en) |
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| JP2007044919A (en) * | 2005-08-08 | 2007-02-22 | Inoac Corp | Fire retardant sound barrier material |
| JP2008062413A (en) * | 2006-09-05 | 2008-03-21 | Daiwa:Kk | Heat insulating material and its manufacturing method |
| JP2008285108A (en) * | 2007-05-21 | 2008-11-27 | Inoac Corp | Flexible polyurethane foam for shut valve and its manufacturing method |
| US7785437B2 (en) | 2003-09-26 | 2010-08-31 | L&P Property Management Company | Anti-microbial carpet underlay and method of making |
| JP2011178169A (en) * | 2003-07-25 | 2011-09-15 | Proprietect Lp | Foam laminate product and method for production thereof |
| JP2012517363A (en) * | 2009-02-10 | 2012-08-02 | プロプライアテクト・エル．ピー． | Foam laminated product and method for producing the same |
| CN109572087A (en) * | 2018-11-01 | 2019-04-05 | 江苏恩伟驰复合材料有限公司 | Special nonwoven fabric and preparation method thereof |
| KR20210023123A (en) * | 2019-08-22 | 2021-03-04 | 씨아이티 주식회사 | Manufacturing method for construction panel |
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| KR102266935B1 (en) | 2019-08-22 | 2021-06-22 | 씨아이티 주식회사 | Manufacturing method for construction panel |
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| JP4623541B2 (en) | 2011-02-02 |
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